This commit was generated by cvs2svn to compensate for changes in r170759,

which included commits to RCS files with non-trunk default branches.

22 files changed, 0 insertions, 12372 deletions

diff --git a/contrib/diff/Makefile.in b/contrib/diff/Makefile.in
deleted file mode 100644
index e8543ad..0000000
--- a/contrib/diff/Makefile.in
+++ /dev/null
@@ -1,198 +0,0 @@
-# Makefile for GNU DIFF
-# Copyright (C) 1988,1989,1991,1992,1993,1994 Free Software Foundation, Inc.
-#
-# This file is part of GNU DIFF.
-#
-# GNU DIFF is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# GNU DIFF is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with GNU DIFF; see the file COPYING.  If not, write to
-# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
-
-#### Start of system configuration section. ####
-
-srcdir = @srcdir@
-VPATH = @srcdir@
-
-CC = @CC@
-INSTALL = @INSTALL@
-INSTALL_PROGRAM = @INSTALL_PROGRAM@
-INSTALL_DATA = @INSTALL_DATA@
-MAKEINFO = makeinfo
-TEXI2DVI = texi2dvi
-
-CPPFLAGS = @CPPFLAGS@
-DEFS = @DEFS@
-CFLAGS = @CFLAGS@
-LDFLAGS = @LDFLAGS@
-LIBS = @LIBS@
-LIBOBJS = @LIBOBJS@
-
-# Some System V machines do not come with libPW.
-# If this is true for you, use the GNU alloca.o here.
-ALLOCA = @ALLOCA@
-
-prefix = @prefix@
-exec_prefix = @exec_prefix@
-edit_program_name = sed '@program_transform_name@'
-
-bindir = $(exec_prefix)/bin
-
-infodir = $(prefix)/info
-
-DEFAULT_EDITOR_PROGRAM = ed
-DIFF_PROGRAM = $(bindir)/`echo diff | $(edit_program_name)`
-NULL_DEVICE = /dev/null
-PR_PROGRAM = /bin/pr
-
-#### End of system configuration section. ####
-
-SHELL = /bin/sh
-
-# The source files for all of the programs.
-srcs=diff.c analyze.c cmpbuf.c cmpbuf.h io.c context.c ed.c normal.c ifdef.c \
-	util.c dir.c memchr.c waitpid.c \
-	version.c diff.h regex.c regex.h side.c system.h \
-	diff3.c sdiff.c cmp.c error.c xmalloc.c getopt.c getopt1.c getopt.h \
-	fnmatch.c fnmatch.h alloca.c
-distfiles = $(srcs) README INSTALL NEWS diagmeet.note Makefile.in \
-	stamp-h.in config.hin configure configure.in COPYING ChangeLog \
-	diff.texi diff.info* texinfo.tex \
-	install-sh mkinstalldirs
-
-PROGRAMS = cmp diff diff3 sdiff
-
-all: $(PROGRAMS) info
-
-COMPILE = $(CC) -c $(CPPFLAGS) $(DEFS) -I. -I$(srcdir) $(CFLAGS)
-
-.c.o:
-	$(COMPILE) $<
-
-diff_o = diff.o analyze.o cmpbuf.o dir.o io.o util.o \
-	context.o ed.o ifdef.o normal.o side.o \
-	fnmatch.o getopt.o getopt1.o regex.o version.o $(ALLOCA) $(LIBOBJS)
-diff: $(diff_o)
-	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(diff_o) $(LIBS)
-
-diff3_o = diff3.o getopt.o getopt1.o version.o $(LIBOBJS)
-diff3: $(diff3_o)
-	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(diff3_o) $(LIBS)
-
-sdiff_o = sdiff.o getopt.o getopt1.o version.o $(LIBOBJS)
-sdiff: $(sdiff_o)
-	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(sdiff_o) $(LIBS)
-
-cmp_o = cmp.o cmpbuf.o error.o getopt.o getopt1.o xmalloc.o version.o $(LIBOBJS)
-cmp: $(cmp_o)
-	$(CC) -o $@ $(CFLAGS) $(LDFLAGS) $(cmp_o) $(LIBS)
-
-info: diff.info
-diff.info: diff.texi
-	$(MAKEINFO) $(srcdir)/diff.texi --output=$@
-
-dvi: diff.dvi
-diff.dvi: diff.texi
-	$(TEXI2DVI) $(srcdir)/diff.texi
-
-$(diff_o): diff.h system.h
-cmp.o diff3.o sdiff.o: system.h
-context.o diff.o regex.o: regex.h
-cmp.o diff.o diff3.o sdiff.o getopt.o getopt1.o: getopt.h
-diff.o fnmatch.o: fnmatch.h
-analyze.o cmpbuf.o cmp.o: cmpbuf.h
-
-cmp.o: cmp.c
-	$(COMPILE) -DNULL_DEVICE=\"$(NULL_DEVICE)\" $(srcdir)/cmp.c
-
-diff3.o: diff3.c
-	$(COMPILE) -DDIFF_PROGRAM=\"$(DIFF_PROGRAM)\" $(srcdir)/diff3.c
-
-sdiff.o: sdiff.c
-	$(COMPILE) -DDEFAULT_EDITOR_PROGRAM=\"$(DEFAULT_EDITOR_PROGRAM)\" \
-		-DDIFF_PROGRAM=\"$(DIFF_PROGRAM)\" $(srcdir)/sdiff.c
-
-util.o: util.c
-	$(COMPILE) -DPR_PROGRAM=\"$(PR_PROGRAM)\" $(srcdir)/util.c
-
-TAGS: $(srcs)
-	etags $(srcs)
-
-clean:
-	rm -f *.o $(PROGRAMS) core
-	rm -f *.aux *.cp *.cps *.dvi *.fn *.fns *.ky *.kys *.log
-	rm -f *.pg *.pgs *.toc *.tp *.tps *.vr *.vrs
-
-mostlyclean: clean
-
-distclean: clean
-	rm -f Makefile config.cache config.h config.log config.status stamp-h
-
-realclean: distclean
-	rm -f TAGS *.info*
-
-install: all installdirs
-	for p in $(PROGRAMS); do \
-	  $(INSTALL_PROGRAM) $$p $(bindir)/`echo $$p | $(edit_program_name)`; \
-	done
-	{ test -f diff.info || cd $(srcdir); } && \
-	for f in diff.info*; do \
-	  $(INSTALL_DATA) $$f $(infodir)/$$f; \
-	done
-
-installdirs:
-	$(SHELL) ${srcdir}/mkinstalldirs $(bindir) $(infodir)
-
-# We need more tests.
-check:
-	./cmp cmp cmp
-	./diff diff diff
-	./diff3 diff3 diff3 diff3
-	./sdiff sdiff sdiff
-
-uninstall:
-	for p in $(PROGRAMS); do \
-	  rm -f $(bindir)/`echo $$p | $(edit_program_name)`; \
-	done
-	rm -f $(infodir)/diff.info*
-
-configure: configure.in
-	cd $(srcdir) && autoconf
-
-# autoheader might not change config.hin.
-config.hin: stamp-h.in
-stamp-h.in: configure.in
-	cd $(srcdir) && autoheader
-	date > $(srcdir)/stamp-h.in
-
-config.status: configure
-	./config.status --recheck
-
-# config.status might not change config.h, but it changes stamp-h.
-config.h: stamp-h
-stamp-h: config.hin config.status
-	./config.status
-Makefile: Makefile.in config.status
-	./config.status
-
-dist: $(distfiles)
-	echo diffutils-`sed -e '/version_string/!d' -e 's/[^0-9]*\([0-9a-z.]*\).*/\1/' -e q version.c` > .fname
-	rm -rf `cat .fname`
-	mkdir `cat .fname`
-	-ln $(distfiles) `cat .fname`
-	for file in $(distfiles); do \
-	  [ -r `cat .fname`/$$file ] || cp -p $$file `cat .fname` || exit; \
-	done
-	tar -chf - `cat .fname` | gzip >`cat .fname`.tar.gz
-	rm -rf `cat .fname` .fname
-
-# Prevent GNU make v3 from overflowing arg limit on SysV.
-.NOEXPORT:
diff --git a/contrib/diff/analyze.c b/contrib/diff/analyze.c
deleted file mode 100644
index 556d388..0000000
--- a/contrib/diff/analyze.c
+++ /dev/null
@@ -1,1084 +0,0 @@
-/* Analyze file differences for GNU DIFF.
-   Copyright (C) 1988, 1989, 1992, 1993 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-/* The basic algorithm is described in:
-   "An O(ND) Difference Algorithm and its Variations", Eugene Myers,
-   Algorithmica Vol. 1 No. 2, 1986, pp. 251-266;
-   see especially section 4.2, which describes the variation used below.
-   Unless the --minimal option is specified, this code uses the TOO_EXPENSIVE
-   heuristic, by Paul Eggert, to limit the cost to O(N**1.5 log N)
-   at the price of producing suboptimal output for large inputs with
-   many differences.
-
-   The basic algorithm was independently discovered as described in:
-   "Algorithms for Approximate String Matching", E. Ukkonen,
-   Information and Control Vol. 64, 1985, pp. 100-118.  */
-
-#include "diff.h"
-#include "cmpbuf.h"
-
-extern int no_discards;
-
-static int *xvec, *yvec;	/* Vectors being compared. */
-static int *fdiag;		/* Vector, indexed by diagonal, containing
-				   1 + the X coordinate of the point furthest
-				   along the given diagonal in the forward
-				   search of the edit matrix. */
-static int *bdiag;		/* Vector, indexed by diagonal, containing
-				   the X coordinate of the point furthest
-				   along the given diagonal in the backward
-				   search of the edit matrix. */
-static int too_expensive;	/* Edit scripts longer than this are too
-				   expensive to compute.  */
-
-#define SNAKE_LIMIT 20	/* Snakes bigger than this are considered `big'.  */
-
-struct partition
-{
-  int xmid, ymid;	/* Midpoints of this partition.  */
-  int lo_minimal;	/* Nonzero if low half will be analyzed minimally.  */
-  int hi_minimal;	/* Likewise for high half.  */
-};
-
-static int diag PARAMS((int, int, int, int, int, struct partition *));
-static struct change *add_change PARAMS((int, int, int, int, struct change *));
-static struct change *build_reverse_script PARAMS((struct file_data const[]));
-static struct change *build_script PARAMS((struct file_data const[]));
-static void briefly_report PARAMS((int, struct file_data const[]));
-static void compareseq PARAMS((int, int, int, int, int));
-static void discard_confusing_lines PARAMS((struct file_data[]));
-static void shift_boundaries PARAMS((struct file_data[]));
-
-/* Find the midpoint of the shortest edit script for a specified
-   portion of the two files.
-
-   Scan from the beginnings of the files, and simultaneously from the ends,
-   doing a breadth-first search through the space of edit-sequence.
-   When the two searches meet, we have found the midpoint of the shortest
-   edit sequence.
-
-   If MINIMAL is nonzero, find the minimal edit script regardless
-   of expense.  Otherwise, if the search is too expensive, use
-   heuristics to stop the search and report a suboptimal answer.
-
-   Set PART->(XMID,YMID) to the midpoint (XMID,YMID).  The diagonal number
-   XMID - YMID equals the number of inserted lines minus the number
-   of deleted lines (counting only lines before the midpoint).
-   Return the approximate edit cost; this is the total number of
-   lines inserted or deleted (counting only lines before the midpoint),
-   unless a heuristic is used to terminate the search prematurely.
-
-   Set PART->LEFT_MINIMAL to nonzero iff the minimal edit script for the
-   left half of the partition is known; similarly for PART->RIGHT_MINIMAL.
-
-   This function assumes that the first lines of the specified portions
-   of the two files do not match, and likewise that the last lines do not
-   match.  The caller must trim matching lines from the beginning and end
-   of the portions it is going to specify.
-
-   If we return the "wrong" partitions,
-   the worst this can do is cause suboptimal diff output.
-   It cannot cause incorrect diff output.  */
-
-static int
-diag (xoff, xlim, yoff, ylim, minimal, part)
-     int xoff, xlim, yoff, ylim, minimal;
-     struct partition *part;
-{
-  int *const fd = fdiag;	/* Give the compiler a chance. */
-  int *const bd = bdiag;	/* Additional help for the compiler. */
-  int const *const xv = xvec;	/* Still more help for the compiler. */
-  int const *const yv = yvec;	/* And more and more . . . */
-  int const dmin = xoff - ylim;	/* Minimum valid diagonal. */
-  int const dmax = xlim - yoff;	/* Maximum valid diagonal. */
-  int const fmid = xoff - yoff;	/* Center diagonal of top-down search. */
-  int const bmid = xlim - ylim;	/* Center diagonal of bottom-up search. */
-  int fmin = fmid, fmax = fmid;	/* Limits of top-down search. */
-  int bmin = bmid, bmax = bmid;	/* Limits of bottom-up search. */
-  int c;			/* Cost. */
-  int odd = (fmid - bmid) & 1;	/* True if southeast corner is on an odd
-				   diagonal with respect to the northwest. */
-
-  fd[fmid] = xoff;
-  bd[bmid] = xlim;
-
-  for (c = 1;; ++c)
-    {
-      int d;			/* Active diagonal. */
-      int big_snake = 0;
-
-      /* Extend the top-down search by an edit step in each diagonal. */
-      fmin > dmin ? fd[--fmin - 1] = -1 : ++fmin;
-      fmax < dmax ? fd[++fmax + 1] = -1 : --fmax;
-      for (d = fmax; d >= fmin; d -= 2)
-	{
-	  int x, y, oldx, tlo = fd[d - 1], thi = fd[d + 1];
-
-	  if (tlo >= thi)
-	    x = tlo + 1;
-	  else
-	    x = thi;
-	  oldx = x;
-	  y = x - d;
-	  while (x < xlim && y < ylim && xv[x] == yv[y])
-	    ++x, ++y;
-	  if (x - oldx > SNAKE_LIMIT)
-	    big_snake = 1;
-	  fd[d] = x;
-	  if (odd && bmin <= d && d <= bmax && bd[d] <= x)
-	    {
-	      part->xmid = x;
-	      part->ymid = y;
-	      part->lo_minimal = part->hi_minimal = 1;
-	      return 2 * c - 1;
-	    }
-	}
-
-      /* Similarly extend the bottom-up search.  */
-      bmin > dmin ? bd[--bmin - 1] = INT_MAX : ++bmin;
-      bmax < dmax ? bd[++bmax + 1] = INT_MAX : --bmax;
-      for (d = bmax; d >= bmin; d -= 2)
-	{
-	  int x, y, oldx, tlo = bd[d - 1], thi = bd[d + 1];
-
-	  if (tlo < thi)
-	    x = tlo;
-	  else
-	    x = thi - 1;
-	  oldx = x;
-	  y = x - d;
-	  while (x > xoff && y > yoff && xv[x - 1] == yv[y - 1])
-	    --x, --y;
-	  if (oldx - x > SNAKE_LIMIT)
-	    big_snake = 1;
-	  bd[d] = x;
-	  if (!odd && fmin <= d && d <= fmax && x <= fd[d])
-	    {
-	      part->xmid = x;
-	      part->ymid = y;
-	      part->lo_minimal = part->hi_minimal = 1;
-	      return 2 * c;
-	    }
-	}
-
-      if (minimal)
-	continue;
-
-      /* Heuristic: check occasionally for a diagonal that has made
-	 lots of progress compared with the edit distance.
-	 If we have any such, find the one that has made the most
-	 progress and return it as if it had succeeded.
-
-	 With this heuristic, for files with a constant small density
-	 of changes, the algorithm is linear in the file size.  */
-
-      if (c > 200 && big_snake && heuristic)
-	{
-	  int best;
-
-	  best = 0;
-	  for (d = fmax; d >= fmin; d -= 2)
-	    {
-	      int dd = d - fmid;
-	      int x = fd[d];
-	      int y = x - d;
-	      int v = (x - xoff) * 2 - dd;
-	      if (v > 12 * (c + (dd < 0 ? -dd : dd)))
-		{
-		  if (v > best
-		      && xoff + SNAKE_LIMIT <= x && x < xlim
-		      && yoff + SNAKE_LIMIT <= y && y < ylim)
-		    {
-		      /* We have a good enough best diagonal;
-			 now insist that it end with a significant snake.  */
-		      int k;
-
-		      for (k = 1; xv[x - k] == yv[y - k]; k++)
-			if (k == SNAKE_LIMIT)
-			  {
-			    best = v;
-			    part->xmid = x;
-			    part->ymid = y;
-			    break;
-			  }
-		    }
-		}
-	    }
-	  if (best > 0)
-	    {
-	      part->lo_minimal = 1;
-	      part->hi_minimal = 0;
-	      return 2 * c - 1;
-	    }
-
-	  best = 0;
-	  for (d = bmax; d >= bmin; d -= 2)
-	    {
-	      int dd = d - bmid;
-	      int x = bd[d];
-	      int y = x - d;
-	      int v = (xlim - x) * 2 + dd;
-	      if (v > 12 * (c + (dd < 0 ? -dd : dd)))
-		{
-		  if (v > best
-		      && xoff < x && x <= xlim - SNAKE_LIMIT
-		      && yoff < y && y <= ylim - SNAKE_LIMIT)
-		    {
-		      /* We have a good enough best diagonal;
-			 now insist that it end with a significant snake.  */
-		      int k;
-
-		      for (k = 0; xv[x + k] == yv[y + k]; k++)
-			if (k == SNAKE_LIMIT - 1)
-			  {
-			    best = v;
-			    part->xmid = x;
-			    part->ymid = y;
-			    break;
-			  }
-		    }
-		}
-	    }
-	  if (best > 0)
-	    {
-	      part->lo_minimal = 0;
-	      part->hi_minimal = 1;
-	      return 2 * c - 1;
-	    }
-	}
-
-      /* Heuristic: if we've gone well beyond the call of duty,
-	 give up and report halfway between our best results so far.  */
-      if (c >= too_expensive)
-	{
-	  int fxybest, fxbest;
-	  int bxybest, bxbest;
-
-	  fxbest = bxbest = 0;  /* Pacify `gcc -Wall'.  */
-
-	  /* Find forward diagonal that maximizes X + Y.  */
-	  fxybest = -1;
-	  for (d = fmax; d >= fmin; d -= 2)
-	    {
-	      int x = min (fd[d], xlim);
-	      int y = x - d;
-	      if (ylim < y)
-		x = ylim + d, y = ylim;
-	      if (fxybest < x + y)
-		{
-		  fxybest = x + y;
-		  fxbest = x;
-		}
-	    }
-
-	  /* Find backward diagonal that minimizes X + Y.  */
-	  bxybest = INT_MAX;
-	  for (d = bmax; d >= bmin; d -= 2)
-	    {
-	      int x = max (xoff, bd[d]);
-	      int y = x - d;
-	      if (y < yoff)
-		x = yoff + d, y = yoff;
-	      if (x + y < bxybest)
-		{
-		  bxybest = x + y;
-		  bxbest = x;
-		}
-	    }
-
-	  /* Use the better of the two diagonals.  */
-	  if ((xlim + ylim) - bxybest < fxybest - (xoff + yoff))
-	    {
-	      part->xmid = fxbest;
-	      part->ymid = fxybest - fxbest;
-	      part->lo_minimal = 1;
-	      part->hi_minimal = 0;
-	    }
-	  else
-	    {
-	      part->xmid = bxbest;
-	      part->ymid = bxybest - bxbest;
-	      part->lo_minimal = 0;
-	      part->hi_minimal = 1;
-	    }
-	  return 2 * c - 1;
-	}
-    }
-}
-
-/* Compare in detail contiguous subsequences of the two files
-   which are known, as a whole, to match each other.
-
-   The results are recorded in the vectors files[N].changed_flag, by
-   storing a 1 in the element for each line that is an insertion or deletion.
-
-   The subsequence of file 0 is [XOFF, XLIM) and likewise for file 1.
-
-   Note that XLIM, YLIM are exclusive bounds.
-   All line numbers are origin-0 and discarded lines are not counted.
- 
-   If MINIMAL is nonzero, find a minimal difference no matter how
-   expensive it is.  */
-
-static void
-compareseq (xoff, xlim, yoff, ylim, minimal)
-     int xoff, xlim, yoff, ylim, minimal;
-{
-  int * const xv = xvec; /* Help the compiler.  */
-  int * const yv = yvec;
-
-  /* Slide down the bottom initial diagonal. */
-  while (xoff < xlim && yoff < ylim && xv[xoff] == yv[yoff])
-    ++xoff, ++yoff;
-  /* Slide up the top initial diagonal. */
-  while (xlim > xoff && ylim > yoff && xv[xlim - 1] == yv[ylim - 1])
-    --xlim, --ylim;
-
-  /* Handle simple cases. */
-  if (xoff == xlim)
-    while (yoff < ylim)
-      files[1].changed_flag[files[1].realindexes[yoff++]] = 1;
-  else if (yoff == ylim)
-    while (xoff < xlim)
-      files[0].changed_flag[files[0].realindexes[xoff++]] = 1;
-  else
-    {
-      int c;
-      struct partition part;
-
-      /* Find a point of correspondence in the middle of the files.  */
-
-      c = diag (xoff, xlim, yoff, ylim, minimal, &part);
-
-      if (c == 1)
-	{
-	  /* This should be impossible, because it implies that
-	     one of the two subsequences is empty,
-	     and that case was handled above without calling `diag'.
-	     Let's verify that this is true.  */
-	  abort ();
-#if 0
-	  /* The two subsequences differ by a single insert or delete;
-	     record it and we are done.  */
-	  if (part.xmid - part.ymid < xoff - yoff)
-	    files[1].changed_flag[files[1].realindexes[part.ymid - 1]] = 1;
-	  else
-	    files[0].changed_flag[files[0].realindexes[part.xmid]] = 1;
-#endif
-	}
-      else
-	{
-	  /* Use the partitions to split this problem into subproblems.  */
-	  compareseq (xoff, part.xmid, yoff, part.ymid, part.lo_minimal);
-	  compareseq (part.xmid, xlim, part.ymid, ylim, part.hi_minimal);
-	}
-    }
-}
-
-/* Discard lines from one file that have no matches in the other file.
-
-   A line which is discarded will not be considered by the actual
-   comparison algorithm; it will be as if that line were not in the file.
-   The file's `realindexes' table maps virtual line numbers
-   (which don't count the discarded lines) into real line numbers;
-   this is how the actual comparison algorithm produces results
-   that are comprehensible when the discarded lines are counted.
-
-   When we discard a line, we also mark it as a deletion or insertion
-   so that it will be printed in the output.  */
-
-static void
-discard_confusing_lines (filevec)
-     struct file_data filevec[];
-{
-  unsigned int f, i;
-  char *discarded[2];
-  int *equiv_count[2];
-  int *p;
-
-  /* Allocate our results.  */
-  p = (int *) xmalloc ((filevec[0].buffered_lines + filevec[1].buffered_lines)
-		       * (2 * sizeof (int)));
-  for (f = 0; f < 2; f++)
-    {
-      filevec[f].undiscarded = p;  p += filevec[f].buffered_lines;
-      filevec[f].realindexes = p;  p += filevec[f].buffered_lines;
-    }
-
-  /* Set up equiv_count[F][I] as the number of lines in file F
-     that fall in equivalence class I.  */
-
-  p = (int *) xmalloc (filevec[0].equiv_max * (2 * sizeof (int)));
-  equiv_count[0] = p;
-  equiv_count[1] = p + filevec[0].equiv_max;
-  bzero (p, filevec[0].equiv_max * (2 * sizeof (int)));
-
-  for (i = 0; i < filevec[0].buffered_lines; ++i)
-    ++equiv_count[0][filevec[0].equivs[i]];
-  for (i = 0; i < filevec[1].buffered_lines; ++i)
-    ++equiv_count[1][filevec[1].equivs[i]];
-
-  /* Set up tables of which lines are going to be discarded.  */
-
-  discarded[0] = xmalloc (sizeof (char)
-			  * (filevec[0].buffered_lines
-			     + filevec[1].buffered_lines));
-  discarded[1] = discarded[0] + filevec[0].buffered_lines;
-  bzero (discarded[0], sizeof (char) * (filevec[0].buffered_lines
-					+ filevec[1].buffered_lines));
-
-  /* Mark to be discarded each line that matches no line of the other file.
-     If a line matches many lines, mark it as provisionally discardable.  */
-
-  for (f = 0; f < 2; f++)
-    {
-      unsigned int end = filevec[f].buffered_lines;
-      char *discards = discarded[f];
-      int *counts = equiv_count[1 - f];
-      int *equivs = filevec[f].equivs;
-      unsigned int many = 5;
-      unsigned int tem = end / 64;
-
-      /* Multiply MANY by approximate square root of number of lines.
-	 That is the threshold for provisionally discardable lines.  */
-      while ((tem = tem >> 2) > 0)
-	many *= 2;
-
-      for (i = 0; i < end; i++)
-	{
-	  int nmatch;
-	  if (equivs[i] == 0)
-	    continue;
-	  nmatch = counts[equivs[i]];
-	  if (nmatch == 0)
-	    discards[i] = 1;
-	  else if (nmatch > many)
-	    discards[i] = 2;
-	}
-    }
-
-  /* Don't really discard the provisional lines except when they occur
-     in a run of discardables, with nonprovisionals at the beginning
-     and end.  */
-
-  for (f = 0; f < 2; f++)
-    {
-      unsigned int end = filevec[f].buffered_lines;
-      register char *discards = discarded[f];
-
-      for (i = 0; i < end; i++)
-	{
-	  /* Cancel provisional discards not in middle of run of discards.  */
-	  if (discards[i] == 2)
-	    discards[i] = 0;
-	  else if (discards[i] != 0)
-	    {
-	      /* We have found a nonprovisional discard.  */
-	      register int j;
-	      unsigned int length;
-	      unsigned int provisional = 0;
-
-	      /* Find end of this run of discardable lines.
-		 Count how many are provisionally discardable.  */
-	      for (j = i; j < end; j++)
-		{
-		  if (discards[j] == 0)
-		    break;
-		  if (discards[j] == 2)
-		    ++provisional;
-		}
-
-	      /* Cancel provisional discards at end, and shrink the run.  */
-	      while (j > i && discards[j - 1] == 2)
-		discards[--j] = 0, --provisional;
-
-	      /* Now we have the length of a run of discardable lines
-		 whose first and last are not provisional.  */
-	      length = j - i;
-
-	      /* If 1/4 of the lines in the run are provisional,
-		 cancel discarding of all provisional lines in the run.  */
-	      if (provisional * 4 > length)
-		{
-		  while (j > i)
-		    if (discards[--j] == 2)
-		      discards[j] = 0;
-		}
-	      else
-		{
-		  register unsigned int consec;
-		  unsigned int minimum = 1;
-		  unsigned int tem = length / 4;
-
-		  /* MINIMUM is approximate square root of LENGTH/4.
-		     A subrun of two or more provisionals can stand
-		     when LENGTH is at least 16.
-		     A subrun of 4 or more can stand when LENGTH >= 64.  */
-		  while ((tem = tem >> 2) > 0)
-		    minimum *= 2;
-		  minimum++;
-
-		  /* Cancel any subrun of MINIMUM or more provisionals
-		     within the larger run.  */
-		  for (j = 0, consec = 0; j < length; j++)
-		    if (discards[i + j] != 2)
-		      consec = 0;
-		    else if (minimum == ++consec)
-		      /* Back up to start of subrun, to cancel it all.  */
-		      j -= consec;
-		    else if (minimum < consec)
-		      discards[i + j] = 0;
-
-		  /* Scan from beginning of run
-		     until we find 3 or more nonprovisionals in a row
-		     or until the first nonprovisional at least 8 lines in.
-		     Until that point, cancel any provisionals.  */
-		  for (j = 0, consec = 0; j < length; j++)
-		    {
-		      if (j >= 8 && discards[i + j] == 1)
-			break;
-		      if (discards[i + j] == 2)
-			consec = 0, discards[i + j] = 0;
-		      else if (discards[i + j] == 0)
-			consec = 0;
-		      else
-			consec++;
-		      if (consec == 3)
-			break;
-		    }
-
-		  /* I advances to the last line of the run.  */
-		  i += length - 1;
-
-		  /* Same thing, from end.  */
-		  for (j = 0, consec = 0; j < length; j++)
-		    {
-		      if (j >= 8 && discards[i - j] == 1)
-			break;
-		      if (discards[i - j] == 2)
-			consec = 0, discards[i - j] = 0;
-		      else if (discards[i - j] == 0)
-			consec = 0;
-		      else
-			consec++;
-		      if (consec == 3)
-			break;
-		    }
-		}
-	    }
-	}
-    }
-
-  /* Actually discard the lines. */
-  for (f = 0; f < 2; f++)
-    {
-      char *discards = discarded[f];
-      unsigned int end = filevec[f].buffered_lines;
-      unsigned int j = 0;
-      for (i = 0; i < end; ++i)
-	if (no_discards || discards[i] == 0)
-	  {
-	    filevec[f].undiscarded[j] = filevec[f].equivs[i];
-	    filevec[f].realindexes[j++] = i;
-	  }
-	else
-	  filevec[f].changed_flag[i] = 1;
-      filevec[f].nondiscarded_lines = j;
-    }
-
-  free (discarded[0]);
-  free (equiv_count[0]);
-}
-
-/* Adjust inserts/deletes of identical lines to join changes
-   as much as possible.
-
-   We do something when a run of changed lines include a
-   line at one end and have an excluded, identical line at the other.
-   We are free to choose which identical line is included.
-   `compareseq' usually chooses the one at the beginning,
-   but usually it is cleaner to consider the following identical line
-   to be the "change".  */
-
-int inhibit;
-
-static void
-shift_boundaries (filevec)
-     struct file_data filevec[];
-{
-  int f;
-
-  if (inhibit)
-    return;
-
-  for (f = 0; f < 2; f++)
-    {
-      char *changed = filevec[f].changed_flag;
-      char const *other_changed = filevec[1-f].changed_flag;
-      int const *equivs = filevec[f].equivs;
-      int i = 0;
-      int j = 0;
-      int i_end = filevec[f].buffered_lines;
-
-      while (1)
-	{
-	  int runlength, start, corresponding;
-
-	  /* Scan forwards to find beginning of another run of changes.
-	     Also keep track of the corresponding point in the other file.  */
-
-	  while (i < i_end && changed[i] == 0)
-	    {
-	      while (other_changed[j++])
-		continue;
-	      i++;
-	    }
-
-	  if (i == i_end)
-	    break;
-
-	  start = i;
-
-	  /* Find the end of this run of changes.  */
-
-	  while (changed[++i])
-	    continue;
-	  while (other_changed[j])
-	    j++;
-
-	  do
-	    {
-	      /* Record the length of this run of changes, so that
-		 we can later determine whether the run has grown.  */
-	      runlength = i - start;
-
-	      /* Move the changed region back, so long as the
-		 previous unchanged line matches the last changed one.
-		 This merges with previous changed regions.  */
-
-	      while (start && equivs[start - 1] == equivs[i - 1])
-		{
-		  changed[--start] = 1;
-		  changed[--i] = 0;
-		  while (changed[start - 1])
-		    start--;
-		  while (other_changed[--j])
-		    continue;
-		}
-
-	      /* Set CORRESPONDING to the end of the changed run, at the last
-		 point where it corresponds to a changed run in the other file.
-		 CORRESPONDING == I_END means no such point has been found.  */
-	      corresponding = other_changed[j - 1] ? i : i_end;
-
-	      /* Move the changed region forward, so long as the
-		 first changed line matches the following unchanged one.
-		 This merges with following changed regions.
-		 Do this second, so that if there are no merges,
-		 the changed region is moved forward as far as possible.  */
-
-	      while (i != i_end && equivs[start] == equivs[i])
-		{
-		  changed[start++] = 0;
-		  changed[i++] = 1;
-		  while (changed[i])
-		    i++;
-		  while (other_changed[++j])
-		    corresponding = i;
-		}
-	    }
-	  while (runlength != i - start);
-
-	  /* If possible, move the fully-merged run of changes
-	     back to a corresponding run in the other file.  */
-
-	  while (corresponding < i)
-	    {
-	      changed[--start] = 1;
-	      changed[--i] = 0;
-	      while (other_changed[--j])
-		continue;
-	    }
-	}
-    }
-}
-
-/* Cons an additional entry onto the front of an edit script OLD.
-   LINE0 and LINE1 are the first affected lines in the two files (origin 0).
-   DELETED is the number of lines deleted here from file 0.
-   INSERTED is the number of lines inserted here in file 1.
-
-   If DELETED is 0 then LINE0 is the number of the line before
-   which the insertion was done; vice versa for INSERTED and LINE1.  */
-
-static struct change *
-add_change (line0, line1, deleted, inserted, old)
-     int line0, line1, deleted, inserted;
-     struct change *old;
-{
-  struct change *new = (struct change *) xmalloc (sizeof (struct change));
-
-  new->line0 = line0;
-  new->line1 = line1;
-  new->inserted = inserted;
-  new->deleted = deleted;
-  new->link = old;
-  return new;
-}
-
-/* Scan the tables of which lines are inserted and deleted,
-   producing an edit script in reverse order.  */
-
-static struct change *
-build_reverse_script (filevec)
-     struct file_data const filevec[];
-{
-  struct change *script = 0;
-  char *changed0 = filevec[0].changed_flag;
-  char *changed1 = filevec[1].changed_flag;
-  int len0 = filevec[0].buffered_lines;
-  int len1 = filevec[1].buffered_lines;
-
-  /* Note that changedN[len0] does exist, and contains 0.  */
-
-  int i0 = 0, i1 = 0;
-
-  while (i0 < len0 || i1 < len1)
-    {
-      if (changed0[i0] || changed1[i1])
-	{
-	  int line0 = i0, line1 = i1;
-
-	  /* Find # lines changed here in each file.  */
-	  while (changed0[i0]) ++i0;
-	  while (changed1[i1]) ++i1;
-
-	  /* Record this change.  */
-	  script = add_change (line0, line1, i0 - line0, i1 - line1, script);
-	}
-
-      /* We have reached lines in the two files that match each other.  */
-      i0++, i1++;
-    }
-
-  return script;
-}
-
-/* Scan the tables of which lines are inserted and deleted,
-   producing an edit script in forward order.  */
-
-static struct change *
-build_script (filevec)
-     struct file_data const filevec[];
-{
-  struct change *script = 0;
-  char *changed0 = filevec[0].changed_flag;
-  char *changed1 = filevec[1].changed_flag;
-  int i0 = filevec[0].buffered_lines, i1 = filevec[1].buffered_lines;
-
-  /* Note that changedN[-1] does exist, and contains 0.  */
-
-  while (i0 >= 0 || i1 >= 0)
-    {
-      if (changed0[i0 - 1] || changed1[i1 - 1])
-	{
-	  int line0 = i0, line1 = i1;
-
-	  /* Find # lines changed here in each file.  */
-	  while (changed0[i0 - 1]) --i0;
-	  while (changed1[i1 - 1]) --i1;
-
-	  /* Record this change.  */
-	  script = add_change (i0, i1, line0 - i0, line1 - i1, script);
-	}
-
-      /* We have reached lines in the two files that match each other.  */
-      i0--, i1--;
-    }
-
-  return script;
-}
-
-/* If CHANGES, briefly report that two files differed.  */
-static void
-briefly_report (changes, filevec)
-     int changes;
-     struct file_data const filevec[];
-{
-  if (changes)
-    message (no_details_flag ? "Files %s and %s differ\n"
-	     : "Binary files %s and %s differ\n",
-	     filevec[0].name, filevec[1].name);
-}
-
-/* Report the differences of two files.  DEPTH is the current directory
-   depth. */
-int
-diff_2_files (filevec, depth)
-     struct file_data filevec[];
-     int depth;
-{
-  int diags;
-  int i;
-  struct change *e, *p;
-  struct change *script;
-  int changes;
-
-
-  /* If we have detected that either file is binary,
-     compare the two files as binary.  This can happen
-     only when the first chunk is read.
-     Also, --brief without any --ignore-* options means
-     we can speed things up by treating the files as binary.  */
-
-  if (read_files (filevec, no_details_flag & ~ignore_some_changes))
-    {
-      /* Files with different lengths must be different.  */
-      if (filevec[0].stat.st_size != filevec[1].stat.st_size
-	  && (filevec[0].desc < 0 || S_ISREG (filevec[0].stat.st_mode))
-	  && (filevec[1].desc < 0 || S_ISREG (filevec[1].stat.st_mode)))
-	changes = 1;
-
-      /* Standard input equals itself.  */
-      else if (filevec[0].desc == filevec[1].desc)
-	changes = 0;
-
-      else
-	/* Scan both files, a buffer at a time, looking for a difference.  */
-	{
-	  /* Allocate same-sized buffers for both files.  */
-	  size_t buffer_size = buffer_lcm (STAT_BLOCKSIZE (filevec[0].stat),
-					   STAT_BLOCKSIZE (filevec[1].stat));
-	  for (i = 0; i < 2; i++)
-	    filevec[i].buffer = xrealloc (filevec[i].buffer, buffer_size);
-
-	  for (;;  filevec[0].buffered_chars = filevec[1].buffered_chars = 0)
-	    {
-	      /* Read a buffer's worth from both files.  */
-	      for (i = 0; i < 2; i++)
-		if (0 <= filevec[i].desc)
-		  while (filevec[i].buffered_chars != buffer_size)
-		    {
-		      int r = read (filevec[i].desc,
-				    filevec[i].buffer
-				    + filevec[i].buffered_chars,
-				    buffer_size - filevec[i].buffered_chars);
-		      if (r == 0)
-			break;
-		      if (r < 0)
-			pfatal_with_name (filevec[i].name);
-		      filevec[i].buffered_chars += r;
-		    }
-
-	      /* If the buffers differ, the files differ.  */
-	      if (filevec[0].buffered_chars != filevec[1].buffered_chars
-		  || (filevec[0].buffered_chars != 0
-		      && memcmp (filevec[0].buffer,
-				 filevec[1].buffer,
-				 filevec[0].buffered_chars) != 0))
-		{
-		  changes = 1;
-		  break;
-		}
-
-	      /* If we reach end of file, the files are the same.  */
-	      if (filevec[0].buffered_chars != buffer_size)
-		{
-		  changes = 0;
-		  break;
-		}
-	    }
-	}
-
-      briefly_report (changes, filevec);
-    }
-  else
-    {
-      /* Allocate vectors for the results of comparison:
-	 a flag for each line of each file, saying whether that line
-	 is an insertion or deletion.
-	 Allocate an extra element, always zero, at each end of each vector.  */
-
-      size_t s = filevec[0].buffered_lines + filevec[1].buffered_lines + 4;
-      filevec[0].changed_flag = xmalloc (s);
-      bzero (filevec[0].changed_flag, s);
-      filevec[0].changed_flag++;
-      filevec[1].changed_flag = filevec[0].changed_flag
-				+ filevec[0].buffered_lines + 2;
-
-      /* Some lines are obviously insertions or deletions
-	 because they don't match anything.  Detect them now, and
-	 avoid even thinking about them in the main comparison algorithm.  */
-
-      discard_confusing_lines (filevec);
-
-      /* Now do the main comparison algorithm, considering just the
-	 undiscarded lines.  */
-
-      xvec = filevec[0].undiscarded;
-      yvec = filevec[1].undiscarded;
-      diags = filevec[0].nondiscarded_lines + filevec[1].nondiscarded_lines + 3;
-      fdiag = (int *) xmalloc (diags * (2 * sizeof (int)));
-      bdiag = fdiag + diags;
-      fdiag += filevec[1].nondiscarded_lines + 1;
-      bdiag += filevec[1].nondiscarded_lines + 1;
-
-      /* Set TOO_EXPENSIVE to be approximate square root of input size,
-	 bounded below by 256.  */
-      too_expensive = 1;
-      for (i = filevec[0].nondiscarded_lines + filevec[1].nondiscarded_lines;
-	   i != 0; i >>= 2)
-	too_expensive <<= 1;
-      too_expensive = max (256, too_expensive);
-
-      files[0] = filevec[0];
-      files[1] = filevec[1];
-
-      compareseq (0, filevec[0].nondiscarded_lines,
-		  0, filevec[1].nondiscarded_lines, no_discards);
-
-      free (fdiag - (filevec[1].nondiscarded_lines + 1));
-
-      /* Modify the results slightly to make them prettier
-	 in cases where that can validly be done.  */
-
-      shift_boundaries (filevec);
-
-      /* Get the results of comparison in the form of a chain
-	 of `struct change's -- an edit script.  */
-
-      if (output_style == OUTPUT_ED)
-	script = build_reverse_script (filevec);
-      else
-	script = build_script (filevec);
-
-      /* Set CHANGES if we had any diffs.
-	 If some changes are ignored, we must scan the script to decide.  */
-      if (ignore_blank_lines_flag || ignore_regexp_list)
-	{
-	  struct change *next = script;
-	  changes = 0;
-
-	  while (next && changes == 0)
-	    {
-	      struct change *this, *end;
-	      int first0, last0, first1, last1, deletes, inserts;
-
-	      /* Find a set of changes that belong together.  */
-	      this = next;
-	      end = find_change (next);
-
-	      /* Disconnect them from the rest of the changes, making them
-		 a hunk, and remember the rest for next iteration.  */
-	      next = end->link;
-	      end->link = 0;
-
-	      /* Determine whether this hunk is really a difference.  */
-	      analyze_hunk (this, &first0, &last0, &first1, &last1,
-			    &deletes, &inserts);
-
-	      /* Reconnect the script so it will all be freed properly.  */
-	      end->link = next;
-
-	      if (deletes || inserts)
-		changes = 1;
-	    }
-	}
-      else
-	changes = (script != 0);
-
-      if (no_details_flag)
-	briefly_report (changes, filevec);
-      else
-	{
-	  if (changes || ! no_diff_means_no_output)
-	    {
-	      /* Record info for starting up output,
-		 to be used if and when we have some output to print.  */
-	      setup_output (files[0].name, files[1].name, depth);
-
-	      switch (output_style)
-		{
-		case OUTPUT_CONTEXT:
-		  print_context_script (script, 0);
-		  break;
-
-		case OUTPUT_UNIFIED:
-		  print_context_script (script, 1);
-		  break;
-
-		case OUTPUT_ED:
-		  print_ed_script (script);
-		  break;
-
-		case OUTPUT_FORWARD_ED:
-		  pr_forward_ed_script (script);
-		  break;
-
-		case OUTPUT_RCS:
-		  print_rcs_script (script);
-		  break;
-
-		case OUTPUT_NORMAL:
-		  print_normal_script (script);
-		  break;
-
-		case OUTPUT_IFDEF:
-		  print_ifdef_script (script);
-		  break;
-
-		case OUTPUT_SDIFF:
-		  print_sdiff_script (script);
-		}
-
-	      finish_output ();
-	    }
-	}
-
-      free (filevec[0].undiscarded);
-
-      free (filevec[0].changed_flag - 1);
-
-      for (i = 1; i >= 0; --i)
-	free (filevec[i].equivs);
-
-      for (i = 0; i < 2; ++i)
-	free (filevec[i].linbuf + filevec[i].linbuf_base);
-
-      for (e = script; e; e = p)
-	{
-	  p = e->link;
-	  free (e);
-	}
-
-      if (! ROBUST_OUTPUT_STYLE (output_style))
-	for (i = 0; i < 2; ++i)
-	  if (filevec[i].missing_newline)
-	    {
-	      error ("No newline at end of file %s", filevec[i].name, "");
-	      changes = 2;
-	    }
-    }
-
-  if (filevec[0].buffer != filevec[1].buffer)
-    free (filevec[0].buffer);
-  free (filevec[1].buffer);
-
-  return changes;
-}
diff --git a/contrib/diff/cmpbuf.c b/contrib/diff/cmpbuf.c
deleted file mode 100644
index e95a8f9..0000000
--- a/contrib/diff/cmpbuf.c
+++ /dev/null
@@ -1,40 +0,0 @@
-/* Buffer primitives for comparison operations.
-   Copyright (C) 1993 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "system.h"
-#include "cmpbuf.h"
-
-/* Least common multiple of two buffer sizes A and B.  */
-
-size_t
-buffer_lcm (a, b)
-     size_t a, b;
-{
-  size_t m, n, r;
-
-  /* Yield reasonable values if buffer sizes are zero.  */
-  if (!a)
-    return b ? b : 8 * 1024;
-  if (!b)
-    return a;
-
-  /* n = gcd (a, b) */
-  for (m = a, n = b;  (r = m % n) != 0;  m = n, n = r)
-    continue;
-
-  return a/n * b;
-}
diff --git a/contrib/diff/cmpbuf.h b/contrib/diff/cmpbuf.h
deleted file mode 100644
index e3852b7..0000000
--- a/contrib/diff/cmpbuf.h
+++ /dev/null
@@ -1,20 +0,0 @@
-/* Buffer primitives for comparison operations.
-   Copyright (C) 1993 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-size_t buffer_lcm PARAMS((size_t, size_t));
diff --git a/contrib/diff/config.hin b/contrib/diff/config.hin
deleted file mode 100644
index d1a5f93..0000000
--- a/contrib/diff/config.hin
+++ /dev/null
@@ -1,117 +0,0 @@
-/* config.hin.  Generated automatically from configure.in by autoheader.  */
-
-/* Define if using alloca.c.  */
-#undef C_ALLOCA
-
-/* Define if the closedir function returns void instead of int.  */
-#undef CLOSEDIR_VOID
-
-/* Define to empty if the keyword does not work.  */
-#undef const
-
-/* Define to one of _getb67, GETB67, getb67 for Cray-2 and Cray-YMP systems.
-   This function is required for alloca.c support on those systems.  */
-#undef CRAY_STACKSEG_END
-
-/* Define if you have <alloca.h> and it should be used (not on Ultrix).  */
-#undef HAVE_ALLOCA_H
-
-/* Define if you don't have vprintf but do have _doprnt.  */
-#undef HAVE_DOPRNT
-
-/* Define if your struct stat has st_blksize.  */
-#undef HAVE_ST_BLKSIZE
-
-/* Define if you have <vfork.h>.  */
-#undef HAVE_VFORK_H
-
-/* Define if you have the vprintf function.  */
-#undef HAVE_VPRINTF
-
-/* Define if on MINIX.  */
-#undef _MINIX
-
-/* Define to `int' if <sys/types.h> doesn't define.  */
-#undef pid_t
-
-/* Define if the system does not provide POSIX.1 features except
-   with this defined.  */
-#undef _POSIX_1_SOURCE
-
-/* Define if you need to in order for stat and other things to work.  */
-#undef _POSIX_SOURCE
-
-/* Define as the return type of signal handlers (int or void).  */
-#undef RETSIGTYPE
-
-/* If using the C implementation of alloca, define if you know the
-   direction of stack growth for your system; otherwise it will be
-   automatically deduced at run-time.
-	STACK_DIRECTION > 0 => grows toward higher addresses
-	STACK_DIRECTION < 0 => grows toward lower addresses
-	STACK_DIRECTION = 0 => direction of growth unknown
- */
-#undef STACK_DIRECTION
-
-/* Define if the `S_IS*' macros in <sys/stat.h> do not work properly.  */
-#undef STAT_MACROS_BROKEN
-
-/* Define if you have the ANSI C header files.  */
-#undef STDC_HEADERS
-
-/* Define if <sys/wait.h> is compatible with Posix applications.  */
-#undef HAVE_SYS_WAIT_H
-
-/* Define vfork as fork if vfork does not work.  */
-#undef vfork
-
-/* Define if you have the dup2 function.  */
-#undef HAVE_DUP2
-
-/* Define if you have the memchr function.  */
-#undef HAVE_MEMCHR
-
-/* Define if you have the sigaction function.  */
-#undef HAVE_SIGACTION
-
-/* Define if you have the strchr function.  */
-#undef HAVE_STRCHR
-
-/* Define if you have the strerror function.  */
-#undef HAVE_STRERROR
-
-/* Define if you have the tmpnam function.  */
-#undef HAVE_TMPNAM
-
-/* Define if you have the <dirent.h> header file.  */
-#undef HAVE_DIRENT_H
-
-/* Define if you have the <fcntl.h> header file.  */
-#undef HAVE_FCNTL_H
-
-/* Define if you have the <limits.h> header file.  */
-#undef HAVE_LIMITS_H
-
-/* Define if you have the <ndir.h> header file.  */
-#undef HAVE_NDIR_H
-
-/* Define if you have the <stdlib.h> header file.  */
-#undef HAVE_STDLIB_H
-
-/* Define if you have the <string.h> header file.  */
-#undef HAVE_STRING_H
-
-/* Define if you have the <sys/dir.h> header file.  */
-#undef HAVE_SYS_DIR_H
-
-/* Define if you have the <sys/file.h> header file.  */
-#undef HAVE_SYS_FILE_H
-
-/* Define if you have the <sys/ndir.h> header file.  */
-#undef HAVE_SYS_NDIR_H
-
-/* Define if you have the <time.h> header file.  */
-#undef HAVE_TIME_H
-
-/* Define if you have the <unistd.h> header file.  */
-#undef HAVE_UNISTD_H
diff --git a/contrib/diff/configure b/contrib/diff/configure
deleted file mode 100755
index b24ef2a..0000000
--- a/contrib/diff/configure
+++ /dev/null
@@ -1,2149 +0,0 @@
-#!/bin/sh
-
-# Guess values for system-dependent variables and create Makefiles.
-# Generated automatically using autoconf version 1.120 
-# Copyright (C) 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
-#
-# This configure script is free software; you can redistribute it and/or
-# modify it under the terms of the GNU General Public License as published
-# by the Free Software Foundation; either version 2, or (at your option)
-# any later version.
-#
-# This script is distributed in the hope that it will be useful, but
-# WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
-# Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this script; if not, write to the Free Software
-# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-#
-# The redistribution and modification terms for this script do not affect
-# the terms for software that it configures.
-
-ac_help=
-
-# Omit some internal or obsolete options to make the list less imposing.
-ac_usage="Usage: configure [options] [host]
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-  --help                  print this message
-  --no-create             do not create output files
-  --quiet, --silent       do not print \`checking...' messages
-  --version               print the version of autoconf that created configure
-Directory and file names:
-  --exec-prefix=PREFIX    install host dependent files in PREFIX [/usr/local]
-  --prefix=PREFIX         install host independent files in PREFIX [/usr/local]
-  --srcdir=DIR            find the sources in DIR [configure dir or ..]
-  --program-prefix=PREFIX prepend PREFIX to installed program names
-  --program-suffix=SUFFIX append SUFFIX to installed program names
-  --program-transform-name=PROGRAM run sed PROGRAM on installed program names
-Host type:
-  --build=BUILD           configure for building on BUILD [BUILD=HOST]
-  --host=HOST             configure for HOST [guessed]
-  --target=TARGET         configure for TARGET [TARGET=HOST]
-Features and packages:
-  --disable-FEATURE       do not include FEATURE (same as --enable-FEATURE=no)
-  --enable-FEATURE[=ARG]  include FEATURE [ARG=yes]
-  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
-  --without-PACKAGE       do not use PACKAGE (same as --with-PACKAGE=no)
-  --x-includes=DIR        X include files are in DIR
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-silent=
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-# Initialize some other variables.
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-
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-  ac_cv_prog_CC="$CC" # Let the user override the test.
-else
-  IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
-  for ac_dir in $PATH; do
-    test -z "$ac_dir" && ac_dir=.
-    if test -f $ac_dir/$ac_word; then
-      ac_cv_prog_CC="gcc"
-      break
-    fi
-  done
-  IFS="$ac_save_ifs"
-  test -z "$ac_cv_prog_CC" && ac_cv_prog_CC="cc"
-fi
-fi
-CC="$ac_cv_prog_CC"
-if test -n "$CC"; then
-  echo "$ac_t""$CC" 1>&4
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-
-echo $ac_n "checking whether we are using GNU C""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_prog_gcc'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.c <<EOF
-#ifdef __GNUC__
-  yes
-#endif
-EOF
-if ${CC-cc} -E conftest.c 2>&5 | egrep yes >/dev/null 2>&1; then
-  ac_cv_prog_gcc=yes
-else
-  ac_cv_prog_gcc=no
-fi
-fi
-echo "$ac_t""$ac_cv_prog_gcc" 1>&4
-if test $ac_cv_prog_gcc = yes; then
-  GCC=yes
-  if test "${CFLAGS+set}" != set; then
-    echo $ac_n "checking whether ${CC-cc} accepts -g""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_prog_gcc_g'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  echo 'void f(){}' > conftest.c
-if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then
-  ac_cv_prog_gcc_g=yes
-else
-  ac_cv_prog_gcc_g=no
-fi
-rm -f conftest*
-
-fi
-    echo "$ac_t""$ac_cv_prog_gcc_g" 1>&4
-    if test $ac_cv_prog_gcc_g = yes; then
-      CFLAGS="-g -O"
-    else
-      CFLAGS="-O"
-    fi
-  fi
-else
-  GCC=
-  test "${CFLAGS+set}" = set || CFLAGS="-g"
-fi
-
-echo $ac_n "checking how to run the C preprocessor""... $ac_c" 1>&4
-# On Suns, sometimes $CPP names a directory.
-if test -n "$CPP" && test -d "$CPP"; then
-  CPP=
-fi
-if test -z "$CPP"; then
-if eval "test \"`echo '${'ac_cv_prog_CPP'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-    # This must be in double quotes, not single quotes, because CPP may get
-  # substituted into the Makefile and "${CC-cc}" will confuse make.
-  CPP="${CC-cc} -E"
-  # On the NeXT, cc -E runs the code through the compiler's parser,
-  # not just through cpp.
-  cat > conftest.$ac_ext <<EOF
-#line 513 "configure"
-#include "confdefs.h"
-#include <stdio.h>
-Syntax Error
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  :
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  CPP="${CC-cc} -E -traditional-cpp"
-  cat > conftest.$ac_ext <<EOF
-#line 527 "configure"
-#include "confdefs.h"
-#include <stdio.h>
-Syntax Error
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  :
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  CPP=/lib/cpp
-fi
-rm -f conftest*
-fi
-rm -f conftest*
-  ac_cv_prog_CPP="$CPP"
-fi
-fi
-CPP="$ac_cv_prog_CPP"
-echo "$ac_t""$CPP" 1>&4
-
-ac_aux_dir=
-for ac_dir in $srcdir $srcdir/.. $srcdir/../..; do
-  if test -f $ac_dir/install-sh; then
-    ac_aux_dir=$ac_dir
-    ac_install_sh="$ac_aux_dir/install-sh -c"
-    break
-  elif test -f $ac_dir/install.sh; then
-    ac_aux_dir=$ac_dir
-    ac_install_sh="$ac_aux_dir/install.sh -c"
-    break
-  fi
-done
-if test -z "$ac_aux_dir"; then
-  { echo "configure: error: can not find install-sh or install.sh in $srcdir $srcdir/.. $srcdir/../.." 1>&2; exit 1; }
-fi
-ac_config_guess=$ac_aux_dir/config.guess
-ac_config_sub=$ac_aux_dir/config.sub
-ac_configure=$ac_aux_dir/configure # This should be Cygnus configure.
-
-# Find a good install program.  We prefer a C program (faster),
-# so one script is as good as another.  But avoid the broken or
-# incompatible versions:
-# SysV /etc/install, /usr/sbin/install
-# SunOS /usr/etc/install
-# IRIX /sbin/install
-# AIX /bin/install
-# AFS /usr/afsws/bin/install, which mishandles nonexistent args
-# SVR4 /usr/ucb/install, which tries to use the nonexistent group "staff"
-# ./install, which can be erroneously created by make from ./install.sh.
-echo $ac_n "checking for a BSD compatible install""... $ac_c" 1>&4
-if test -z "$INSTALL"; then
-if eval "test \"`echo '${'ac_cv_path_install'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-    IFS="${IFS= 	}"; ac_save_ifs="$IFS"; IFS="${IFS}:"
-  for ac_dir in $PATH; do
-    case "$ac_dir" in
-    ''|.|/etc|/usr/sbin|/usr/etc|/sbin|/usr/afsws/bin|/usr/ucb) ;;
-    *)
-      # OSF1 and SCO ODT 3.0 have their own names for install.
-      for ac_prog in ginstall installbsd scoinst install; do
-        if test -f $ac_dir/$ac_prog; then
-	  if test $ac_prog = install &&
-            grep dspmsg $ac_dir/$ac_prog >/dev/null 2>&1; then
-	    # AIX install.  It has an incompatible calling convention.
-	    # OSF/1 installbsd also uses dspmsg, but is usable.
-	    :
-	  else
-	    ac_cv_path_install="$ac_dir/$ac_prog -c"
-	    break 2
-	  fi
-	fi
-      done
-      ;;
-    esac
-  done
-  IFS="$ac_save_ifs"
-  # As a last resort, use the slow shell script.
-  test -z "$ac_cv_path_install" && ac_cv_path_install="$ac_install_sh"
-fi
-  INSTALL="$ac_cv_path_install"
-fi
-echo "$ac_t""$INSTALL" 1>&4
-
-# Use test -z because SunOS4 sh mishandles braces in ${var-val}.
-# It thinks the first close brace ends the variable substitution.
-test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}'
-
-test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
-
-echo $ac_n "checking for POSIXized ISC""... $ac_c" 1>&4
-if test -d /etc/conf/kconfig.d &&
-  grep _POSIX_VERSION /usr/include/sys/unistd.h >/dev/null 2>&1
-then
-  echo "$ac_t""yes" 1>&4
-  ISC=yes # If later tests want to check for ISC.
-  cat >> confdefs.h <<\EOF
-#define _POSIX_SOURCE 1
-EOF
-
-  if test "$GCC" = yes; then
-    CC="$CC -posix"
-  else
-    CC="$CC -Xp"
-  fi
-else
-  echo "$ac_t""no" 1>&4
-  ISC=
-fi
-
-ac_safe=`echo "minix/config.h" | tr './' '__'`
-echo $ac_n "checking for minix/config.h""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_$ac_safe'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 646 "configure"
-#include "confdefs.h"
-#include <minix/config.h>
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=yes"
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=no"
-fi
-rm -f conftest*
-fi
-if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  MINIX=yes
-else
-  echo "$ac_t""no" 1>&4
-MINIX=
-fi
-
-if test "$MINIX" = yes; then
-  cat >> confdefs.h <<\EOF
-#define _POSIX_SOURCE 1
-EOF
-
-  cat >> confdefs.h <<\EOF
-#define _POSIX_1_SOURCE 2
-EOF
-
-  cat >> confdefs.h <<\EOF
-#define _MINIX 1
-EOF
-
-fi
-
-echo $ac_n "checking for working const""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_c_const'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 690 "configure"
-#include "confdefs.h"
-
-int main() { return 0; }
-int t() {
-
-/* Ultrix mips cc rejects this.  */
-typedef int charset[2]; const charset x;
-/* SunOS 4.1.1 cc rejects this.  */
-char const *const *ccp;
-char **p;
-/* NEC SVR4.0.2 mips cc rejects this.  */
-struct point {int x, y;};
-static struct point const zero;
-/* AIX XL C 1.02.0.0 rejects this.
-   It does not let you subtract one const X* pointer from another in an arm
-   of an if-expression whose if-part is not a constant expression */
-const char *g = "string";
-ccp = &g + (g ? g-g : 0);
-/* HPUX 7.0 cc rejects these. */
-++ccp;
-p = (char**) ccp;
-ccp = (char const *const *) p;
-{ /* SCO 3.2v4 cc rejects this.  */
-  char *t;
-  char const *s = 0 ? (char *) 0 : (char const *) 0;
-
-  *t++ = 0;
-}
-{ /* Someone thinks the Sun supposedly-ANSI compiler will reject this.  */
-  int x[] = {25, 17};
-  const int *foo = &x[0];
-  ++foo;
-}
-{ /* Sun SC1.0 ANSI compiler rejects this -- but not the above. */
-  typedef const int *iptr;
-  iptr p = 0;
-  ++p;
-}
-{ /* AIX XL C 1.02.0.0 rejects this saying
-     "k.c", line 2.27: 1506-025 (S) Operand must be a modifiable lvalue. */
-  struct s { int j; const int *ap[3]; };
-  struct s *b; b->j = 5;
-}
-{ /* ULTRIX-32 V3.1 (Rev 9) vcc rejects this */
-  const int foo = 10;
-}
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_c_const=yes
-else
-  rm -rf conftest*
-  ac_cv_c_const=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_c_const" 1>&4
-if test $ac_cv_c_const = no; then
-  cat >> confdefs.h <<\EOF
-#define const 
-EOF
-
-fi
-
-# If we cannot run a trivial program, we must be cross compiling.
-echo $ac_n "checking whether cross-compiling""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_c_cross'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  if test "$cross_compiling" = yes; then
-  ac_cv_cross=yes
-else
-cat > conftest.$ac_ext <<EOF
-#line 767 "configure"
-#include "confdefs.h"
-main(){return(0);}
-EOF
-eval $ac_link
-if test -s conftest && (./conftest; exit) 2>/dev/null; then
-  ac_cv_c_cross=no
-else
-  ac_cv_c_cross=yes
-fi
-fi
-rm -fr conftest*
-fi
-cross_compiling=$ac_cv_c_cross
-echo "$ac_t""$ac_cv_c_cross" 1>&4
-
-echo $ac_n "checking for ANSI C header files""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_stdc'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 788 "configure"
-#include "confdefs.h"
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <float.h>
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  rm -rf conftest*
-  ac_cv_header_stdc=yes
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  ac_cv_header_stdc=no
-fi
-rm -f conftest*
-
-if test $ac_cv_header_stdc = yes; then
-  # SunOS 4.x string.h does not declare mem*, contrary to ANSI.
-cat > conftest.$ac_ext <<EOF
-#line 810 "configure"
-#include "confdefs.h"
-#include <string.h>
-EOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "memchr" >/dev/null 2>&1; then
-  :
-else
-  rm -rf conftest*
-  ac_cv_header_stdc=no
-fi
-rm -f conftest*
-
-fi
-
-if test $ac_cv_header_stdc = yes; then
-  # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI.
-cat > conftest.$ac_ext <<EOF
-#line 828 "configure"
-#include "confdefs.h"
-#include <stdlib.h>
-EOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "free" >/dev/null 2>&1; then
-  :
-else
-  rm -rf conftest*
-  ac_cv_header_stdc=no
-fi
-rm -f conftest*
-
-fi
-
-if test $ac_cv_header_stdc = yes; then
-  # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi.
-if test "$cross_compiling" = yes; then
-  ac_cv_header_stdc=no
-else
-cat > conftest.$ac_ext <<EOF
-#line 849 "configure"
-#include "confdefs.h"
-#include <ctype.h>
-#define ISLOWER(c) ('a' <= (c) && (c) <= 'z')
-#define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c))
-#define XOR(e, f) (((e) && !(f)) || (!(e) && (f)))
-int main () { int i; for (i = 0; i < 256; i++)
-if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2);
-exit (0); }
-
-EOF
-eval $ac_link
-if test -s conftest && (./conftest; exit) 2>/dev/null; then
-  :
-else
-  ac_cv_header_stdc=no
-fi
-fi
-rm -fr conftest*
-fi
-fi
-echo "$ac_t""$ac_cv_header_stdc" 1>&4
-if test $ac_cv_header_stdc = yes; then
-  cat >> confdefs.h <<\EOF
-#define STDC_HEADERS 1
-EOF
-
-fi
-
-for ac_hdr in unistd.h fcntl.h limits.h stdlib.h string.h sys/file.h time.h
-do
-ac_safe=`echo "$ac_hdr" | tr './' '__'`
-echo $ac_n "checking for $ac_hdr""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_$ac_safe'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 886 "configure"
-#include "confdefs.h"
-#include <$ac_hdr>
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=yes"
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=no"
-fi
-rm -f conftest*
-fi
-if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-    ac_tr_hdr=HAVE_`echo $ac_hdr | tr '[a-z]./' '[A-Z]__'`
-  cat >> confdefs.h <<EOF
-#define $ac_tr_hdr 1
-EOF
- 
-else
-  echo "$ac_t""no" 1>&4
-fi
-done
-
-ac_header_dirent=no
-for ac_hdr in dirent.h sys/ndir.h sys/dir.h ndir.h
-do
-ac_safe=`echo "$ac_hdr" | tr './' '__'`
-echo $ac_n "checking for $ac_hdr that defines DIR""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_dirent_$ac_safe'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 923 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <$ac_hdr>
-int main() { return 0; }
-int t() {
-DIR *dirp = 0;
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_header_dirent_$ac_safe=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_header_dirent_$ac_safe=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_header_dirent_'$ac_safe`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-    ac_tr_hdr=HAVE_`echo $ac_hdr | tr '[a-z]./' '[A-Z]__'`
-  cat >> confdefs.h <<EOF
-#define $ac_tr_hdr 1
-EOF
- ac_header_dirent=$ac_hdr; break
-else
-  echo "$ac_t""no" 1>&4
-fi
-done
-# Two versions of opendir et al. are in -ldir and -lx on SCO Xenix,
-# and -lx contains other useful things as well.  (FIXME what are they?)
-if test $ac_header_dirent = dirent.h; then
-echo $ac_n "checking for -ldir""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_lib_dir'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  ac_save_LIBS="$LIBS"
-LIBS="$LIBS -ldir "
-cat > conftest.$ac_ext <<EOF
-#line 963 "configure"
-#include "confdefs.h"
-
-int main() { return 0; }
-int t() {
-opendir()
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_lib_dir=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_lib_dir=no"
-fi
-rm -f conftest*
-LIBS="$ac_save_LIBS"
-
-fi
-if eval "test \"`echo '$ac_cv_lib_'dir`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  LIBS="$LIBS -ldir"
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-fi
-echo $ac_n "checking for -lx""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_lib_x'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  ac_save_LIBS="$LIBS"
-LIBS="$LIBS -lx "
-cat > conftest.$ac_ext <<EOF
-#line 997 "configure"
-#include "confdefs.h"
-
-int main() { return 0; }
-int t() {
-main()
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_lib_x=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_lib_x=no"
-fi
-rm -f conftest*
-LIBS="$ac_save_LIBS"
-
-fi
-if eval "test \"`echo '$ac_cv_lib_'x`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  LIBS="$LIBS -lx"
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-
-echo $ac_n "checking whether stat file-mode macros are broken""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_stat_broken'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1029 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <sys/stat.h>
-#ifdef S_ISBLK
-# if S_ISBLK (S_IFDIR)
-You lose.
-# endif
-# ifdef S_IFCHR
-#  if S_ISBLK (S_IFCHR)
-You lose.
-#  endif
-# endif
-#endif
-
-#ifdef S_ISLNK
-# if S_ISLNK (S_IFREG)
-You lose.
-# endif
-#endif
-
-#ifdef S_ISSOCK
-# if S_ISSOCK (S_IFREG)
-You lose.
-# endif
-#endif
-
-EOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "You lose" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_header_stat_broken=yes
-else
-  rm -rf conftest*
-  ac_cv_header_stat_broken=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_header_stat_broken" 1>&4
-if test $ac_cv_header_stat_broken = yes; then
-  cat >> confdefs.h <<\EOF
-#define STAT_MACROS_BROKEN 1
-EOF
-
-fi
-
-echo $ac_n "checking for sys/wait.h that is compatible with Posix.1""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_sys_wait_h'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1081 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <sys/wait.h>
-#ifndef WEXITSTATUS
-#define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >> 8)
-#endif
-#ifndef WIFEXITED
-#define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
-#endif
-int main() { return 0; }
-int t() {
-int s;
-wait (&s);
-waitpid (0, &s, 0);
-s = WIFEXITED (s) ? WEXITSTATUS (s) : 1;
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_header_sys_wait_h=yes
-else
-  rm -rf conftest*
-  ac_cv_header_sys_wait_h=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_header_sys_wait_h" 1>&4
-if test $ac_cv_header_sys_wait_h = yes; then
-  cat >> confdefs.h <<\EOF
-#define HAVE_SYS_WAIT_H 1
-EOF
-
-fi
-
-echo $ac_n "checking for pid_t""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_type_pid_t'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1122 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#if STDC_HEADERS
-#include <stdlib.h>
-#endif
-EOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "pid_t" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_type_pid_t=yes
-else
-  rm -rf conftest*
-  ac_cv_type_pid_t=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_type_pid_t" 1>&4
-if test $ac_cv_type_pid_t = no; then
-  cat >> confdefs.h <<\EOF
-#define pid_t int
-EOF
-
-fi
-
-echo $ac_n "checking return type of signal handlers""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_type_signal'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1153 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <signal.h>
-#ifdef signal
-#undef signal
-#endif
-extern void (*signal ()) ();
-int main() { return 0; }
-int t() {
-int i;
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_type_signal=void
-else
-  rm -rf conftest*
-  ac_cv_type_signal=int
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_type_signal" 1>&4
-cat >> confdefs.h <<EOF
-#define RETSIGTYPE $ac_cv_type_signal
-EOF
-
-
-for ac_func in dup2 memchr sigaction strchr strerror tmpnam
-do
-echo $ac_n "checking for $ac_func""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_$ac_func'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1189 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char $ac_func(); $ac_func();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-    ac_tr_func=HAVE_`echo $ac_func | tr '[a-z]' '[A-Z]'`
-  cat >> confdefs.h <<EOF
-#define $ac_tr_func 1
-EOF
- 
-else
-  echo "$ac_t""no" 1>&4
-fi
-done
-
-for ac_func in memchr waitpid
-do
-echo $ac_n "checking for $ac_func""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_$ac_func'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1236 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_$ac_func) || defined (__stub___$ac_func)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char $ac_func(); $ac_func();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func_$ac_func=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'$ac_func`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  :
-else
-  echo "$ac_t""no" 1>&4
-LIBOBJS="$LIBOBJS ${ac_func}.o"
-fi
-
-done
-
-# The Ultrix 4.2 mips builtin alloca declared by alloca.h only works
-# for constant arguments.  Useless!
-echo $ac_n "checking for working alloca.h""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_alloca_h'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1281 "configure"
-#include "confdefs.h"
-#include <alloca.h>
-int main() { return 0; }
-int t() {
-char *p = alloca(2 * sizeof(int));
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_header_alloca_h=yes
-else
-  rm -rf conftest*
-  ac_cv_header_alloca_h=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_header_alloca_h" 1>&4
-if test $ac_cv_header_alloca_h = yes; then
-  cat >> confdefs.h <<\EOF
-#define HAVE_ALLOCA_H 1
-EOF
-
-fi
-
-echo $ac_n "checking for alloca""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_alloca'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1312 "configure"
-#include "confdefs.h"
-
-#ifdef __GNUC__
-# define alloca __builtin_alloca
-#else
-# if HAVE_ALLOCA_H
-#  include <alloca.h>
-# else
-#  ifdef _AIX
- #pragma alloca
-#  else
-#   ifndef alloca /* predefined by HP cc +Olibcalls */
-char *alloca ();
-#   endif
-#  endif
-# endif
-#endif
-
-int main() { return 0; }
-int t() {
-char *p = (char *) alloca(1);
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_func_alloca=yes
-else
-  rm -rf conftest*
-  ac_cv_func_alloca=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_func_alloca" 1>&4
-if test $ac_cv_func_alloca = yes; then
-  cat >> confdefs.h <<\EOF
-#define HAVE_ALLOCA 1
-EOF
-
-fi
-
-if test $ac_cv_func_alloca = no; then
-  # The SVR3 libPW and SVR4 libucb both contain incompatible functions
-  # that cause trouble.  Some versions do not even contain alloca or
-  # contain a buggy version.  If you still want to use their alloca,
-  # use ar to extract alloca.o from them instead of compiling alloca.c.
-  ALLOCA=alloca.o
-  cat >> confdefs.h <<\EOF
-#define C_ALLOCA 1
-EOF
-
-
-echo $ac_n "checking whether alloca needs Cray hooks""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_os_cray'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1370 "configure"
-#include "confdefs.h"
-#if defined(CRAY) && ! defined(CRAY2)
-webecray
-#else
-wenotbecray
-#endif
-
-EOF
-if (eval "$ac_cpp conftest.$ac_ext") 2>&5 |
-  egrep "webecray" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_os_cray=yes
-else
-  rm -rf conftest*
-  ac_cv_os_cray=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_os_cray" 1>&4
-if test $ac_cv_os_cray = yes; then
-echo $ac_n "checking for _getb67""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func__getb67'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1397 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub__getb67) || defined (__stub____getb67)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char _getb67(); _getb67();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func__getb67=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func__getb67=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'_getb67`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define CRAY_STACKSEG_END _getb67
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-echo $ac_n "checking for GETB67""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_GETB67'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1438 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_GETB67) || defined (__stub___GETB67)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char GETB67(); GETB67();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func_GETB67=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func_GETB67=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'GETB67`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define CRAY_STACKSEG_END GETB67
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-echo $ac_n "checking for getb67""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_getb67'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1479 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_getb67) || defined (__stub___getb67)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char getb67(); getb67();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func_getb67=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func_getb67=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'getb67`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define CRAY_STACKSEG_END getb67
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-fi
-
-fi
-
-fi
-
-echo $ac_n "checking stack direction for C alloca""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_c_stack_direction'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  if test "$cross_compiling" = yes; then
-  ac_cv_c_stack_direction=0
-else
-cat > conftest.$ac_ext <<EOF
-#line 1531 "configure"
-#include "confdefs.h"
-find_stack_direction ()
-{
-  static char *addr = 0;
-  auto char dummy;
-  if (addr == 0)
-    {
-      addr = &dummy;
-      return find_stack_direction ();
-    }
-  else
-    return (&dummy > addr) ? 1 : -1;
-}
-main ()
-{
-  exit (find_stack_direction() < 0);
-}
-EOF
-eval $ac_link
-if test -s conftest && (./conftest; exit) 2>/dev/null; then
-  ac_cv_c_stack_direction=1
-else
-  ac_cv_c_stack_direction=-1
-fi
-fi
-rm -fr conftest*
-fi
-echo "$ac_t""$ac_cv_c_stack_direction" 1>&4
-cat >> confdefs.h <<EOF
-#define STACK_DIRECTION $ac_cv_c_stack_direction
-EOF
-
-fi
-
-echo $ac_n "checking whether closedir returns void""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_closedir_void'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  if test "$cross_compiling" = yes; then
-    { echo "configure: error: can not run test program while cross compiling" 1>&2; exit 1; }
-else
-cat > conftest.$ac_ext <<EOF
-#line 1574 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <$ac_header_dirent>
-int closedir(); main() { exit(closedir(opendir(".")) != 0); }
-EOF
-eval $ac_link
-if test -s conftest && (./conftest; exit) 2>/dev/null; then
-  ac_cv_func_closedir_void=no
-else
-  ac_cv_func_closedir_void=yes
-fi
-fi
-rm -fr conftest*
-fi
-echo "$ac_t""$ac_cv_func_closedir_void" 1>&4
-if test $ac_cv_func_closedir_void = yes; then
-  cat >> confdefs.h <<\EOF
-#define CLOSEDIR_VOID 1
-EOF
-
-fi
-
-ac_safe=`echo "vfork.h" | tr './' '__'`
-echo $ac_n "checking for vfork.h""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_header_$ac_safe'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1603 "configure"
-#include "confdefs.h"
-#include <vfork.h>
-EOF
-eval "$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-ac_err=`grep -v '^ *+' conftest.out`
-if test -z "$ac_err"; then
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=yes"
-else
-  echo "$ac_err" >&5
-  rm -rf conftest*
-  eval "ac_cv_header_$ac_safe=no"
-fi
-rm -f conftest*
-fi
-if eval "test \"`echo '$ac_cv_header_'$ac_safe`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define HAVE_VFORK_H 1
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-echo $ac_n "checking for working vfork""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_vfork'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  
-if test "$cross_compiling" = yes; then
-  ac_cv_func_vfork=no
-else
-cat > conftest.$ac_ext <<EOF
-#line 1638 "configure"
-#include "confdefs.h"
-/* Thanks to Paul Eggert for this test.  */
-#include <stdio.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <signal.h>
-#ifdef HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-#ifdef HAVE_VFORK_H
-#include <vfork.h>
-#endif
-/* On sparc systems, changes by the child to local and incoming
-   argument registers are propagated back to the parent.
-   The compiler is told about this with #include <vfork.h>,
-   but some compilers (e.g. gcc -O) don't grok <vfork.h>.
-   Test for this by using a static variable whose address
-   is put into a register that is clobbered by the vfork.  */
-static
-#ifdef __cplusplus
-sparc_address_test (int arg)
-#else
-sparc_address_test (arg) int arg;
-#endif
-{
-  static pid_t child;
-  if (!child) {
-    child = vfork ();
-    if (child < 0)
-      perror ("vfork");
-    if (!child) {
-      arg = getpid();
-      write(-1, "", 0);
-      _exit (arg);
-    }
-  }
-}
-static int signalled;
-static RETSIGTYPE catch (s) int s; { signalled = 1; }
-main() {
-  pid_t parent = getpid ();
-  pid_t child;
-
-  sparc_address_test ();
-
-  signal (SIGINT, catch);
-
-  child = vfork ();
-
-  if (child == 0) {
-    /* Here is another test for sparc vfork register problems.
-       This test uses lots of local variables, at least
-       as many local variables as main has allocated so far
-       including compiler temporaries.  4 locals are enough for
-       gcc 1.40.3 on a sparc, but we use 8 to be safe.
-       A buggy compiler should reuse the register of parent
-       for one of the local variables, since it will think that
-       parent can't possibly be used any more in this routine.
-       Assigning to the local variable will thus munge parent
-       in the parent process.  */
-    pid_t
-      p = getpid(), p1 = getpid(), p2 = getpid(), p3 = getpid(),
-      p4 = getpid(), p5 = getpid(), p6 = getpid(), p7 = getpid();
-    /* Convince the compiler that p..p7 are live; otherwise, it might
-       use the same hardware register for all 8 local variables.  */
-    if (p != p1 || p != p2 || p != p3 || p != p4
-	|| p != p5 || p != p6 || p != p7)
-      _exit(1);
-
-    /* On some systems (e.g. SunOS 5.2), if the parent is catching
-       a signal, the child ignores the signal before execing,
-       and the parent later receives that signal, the parent dumps core.
-       Test for this by ignoring SIGINT in the child.  */
-    signal (SIGINT, SIG_IGN);
-
-    /* On some systems (e.g. IRIX 3.3),
-       vfork doesn't separate parent from child file descriptors.
-       If the child closes a descriptor before it execs or exits,
-       this munges the parent's descriptor as well.
-       Test for this by closing stdout in the child.  */
-    _exit(close(fileno(stdout)) != 0);
-  } else {
-    int status;
-    struct stat st;
-
-    while (wait(&status) != child)
-      ;
-    exit(
-	 /* Was there some problem with vforking?  */
-	 child < 0
-
-	 /* Did the child fail?  (This shouldn't happen.)  */
-	 || status
-
-	 /* Did the vfork/compiler bug occur?  */
-	 || parent != getpid()
-
-	 /* Did the signal handling bug occur?  */
-	 || kill(parent, SIGINT) != 0
-	 || signalled != 1
-
-	 /* Did the file descriptor bug occur?  */
-	 || fstat(fileno(stdout), &st) != 0
-	 );
-  }
-}
-EOF
-eval $ac_link
-if test -s conftest && (./conftest; exit) 2>/dev/null; then
-  ac_cv_func_vfork=yes
-else
-  ac_cv_func_vfork=no
-fi
-fi
-rm -fr conftest*
-fi
-echo "$ac_t""$ac_cv_func_vfork" 1>&4
-if test $ac_cv_func_vfork = no; then
-  cat >> confdefs.h <<\EOF
-#define vfork fork
-EOF
-
-fi
-
-echo $ac_n "checking for vprintf""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func_vprintf'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1768 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub_vprintf) || defined (__stub___vprintf)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char vprintf(); vprintf();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func_vprintf=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func_vprintf=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'vprintf`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define HAVE_VPRINTF 1
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-if test "$ac_cv_func_vprintf" != yes; then
-echo $ac_n "checking for _doprnt""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_func__doprnt'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1812 "configure"
-#include "confdefs.h"
-#include <ctype.h> /* Arbitrary system header to define __stub macros. */
-int main() { return 0; }
-int t() {
-
-/* The GNU C library defines this for functions which it implements
-    to always fail with ENOSYS.  Some functions are actually named
-    something starting with __ and the normal name is an alias.  */
-#if defined (__stub__doprnt) || defined (__stub____doprnt)
-choke me
-#else
-/* Override any gcc2 internal prototype to avoid an error.  */
-char _doprnt(); _doprnt();
-#endif
-
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  eval "ac_cv_func__doprnt=yes"
-else
-  rm -rf conftest*
-  eval "ac_cv_func__doprnt=no"
-fi
-rm -f conftest*
-
-fi
-if eval "test \"`echo '$ac_cv_func_'_doprnt`\" = yes"; then
-  echo "$ac_t""yes" 1>&4
-  cat >> confdefs.h <<\EOF
-#define HAVE_DOPRNT 1
-EOF
-
-else
-  echo "$ac_t""no" 1>&4
-fi
-
-fi
-
-echo $ac_n "checking for st_blksize in struct stat""... $ac_c" 1>&4
-if eval "test \"`echo '${'ac_cv_struct_st_blksize'+set}'`\" = set"; then
-  echo $ac_n "(cached) $ac_c" 1>&4
-else
-  cat > conftest.$ac_ext <<EOF
-#line 1857 "configure"
-#include "confdefs.h"
-#include <sys/types.h>
-#include <sys/stat.h>
-int main() { return 0; }
-int t() {
-struct stat s; s.st_blksize;
-; return 0; }
-EOF
-if eval $ac_link; then
-  rm -rf conftest*
-  ac_cv_struct_st_blksize=yes
-else
-  rm -rf conftest*
-  ac_cv_struct_st_blksize=no
-fi
-rm -f conftest*
-
-fi
-echo "$ac_t""$ac_cv_struct_st_blksize" 1>&4
-if test $ac_cv_struct_st_blksize = yes; then
-  cat >> confdefs.h <<\EOF
-#define HAVE_ST_BLKSIZE 1
-EOF
-
-fi
-
-trap '' 1 2 15
-if test -w $cache_file; then
-echo "updating cache $cache_file"
-cat > $cache_file <<\EOF
-# This file is a shell script that caches the results of configure
-# tests run on this system so they can be shared between configure
-# scripts and configure runs.  It is not useful on other systems.
-# If it contains results you don't want to keep, you may remove or edit it.
-#
-# By default, configure uses ./config.cache as the cache file,
-# creating it if it does not exist already.  You can give configure
-# the --cache-file=FILE option to use a different cache file; that is
-# what configure does when it calls configure scripts in
-# subdirectories, so they share the cache.
-# Giving --cache-file=/dev/null disables caching, for debugging configure.
-# config.status only pays attention to the cache file if you give it the
-# --recheck option to rerun configure.
-#
-EOF
-# Ultrix sh set writes to stderr and can't be redirected directly.
-(set) 2>&1 |
-  sed -n "s/^\([a-zA-Z0-9_]*_cv_[a-zA-Z0-9_]*\)=\(.*\)/: \${\1='\2'}/p" \
-  >> $cache_file
-else
-echo "not updating unwritable cache $cache_file"
-fi
-
-trap 'rm -fr conftest* confdefs* core $ac_clean_files; exit 1' 1 2 15
-
-test "x$prefix" = xNONE && prefix=/usr/local
-# Let make expand exec_prefix.
-test "x$exec_prefix" = xNONE && exec_prefix='${prefix}'
-
-# Any assignment to VPATH causes Sun make to only execute
-# the first set of double-colon rules, so remove it if not needed.
-# If there is a colon in the path, we need to keep it.
-if test "x$srcdir" = x.; then
-  ac_vpsub='/^[ 	]*VPATH[ 	]*=[^:]*$/d'
-fi
-
-trap 'rm -f $CONFIG_STATUS conftest*; exit 1' 1 2 15
-
-DEFS=-DHAVE_CONFIG_H
-
-# Without the "./", some shells look in PATH for config.status.
-: ${CONFIG_STATUS=./config.status}
-
-echo creating $CONFIG_STATUS
-rm -f $CONFIG_STATUS
-cat > $CONFIG_STATUS <<EOF
-#!/bin/sh
-# Generated automatically by configure.
-# Run this file to recreate the current configuration.
-# This directory was configured as follows,
-# on host `(hostname || uname -n) 2>/dev/null | sed 1q`:
-#
-# $0 $ac_configure_args
-#
-# Compiler output produced by configure, useful for debugging
-# configure, is in ./config.log if it exists.
-
-ac_cs_usage="Usage: $CONFIG_STATUS [--recheck] [--version] [--help]"
-for ac_option
-do
-  case "\$ac_option" in
-  -recheck | --recheck | --rechec | --reche | --rech | --rec | --re | --r)
-    echo "running \${CONFIG_SHELL-/bin/sh} $0 $ac_configure_args --no-create --no-recursion"
-    exec \${CONFIG_SHELL-/bin/sh} $0 $ac_configure_args --no-create --no-recursion ;;
-  -version | --version | --versio | --versi | --vers | --ver | --ve | --v)
-    echo "$CONFIG_STATUS generated by autoconf version 1.120"
-    exit 0 ;;
-  -help | --help | --hel | --he | --h)
-    echo "\$ac_cs_usage"; exit 0 ;;
-  *) echo "\$ac_cs_usage"; exit 1 ;;
-  esac
-done
-
-ac_given_srcdir=$srcdir
-ac_given_INSTALL="$INSTALL"
-
-trap 'rm -fr Makefile config.h:config.hin conftest*; exit 1' 1 2 15
-
-# Protect against being on the right side of a sed subst in config.status. 
-sed 's/%@/@@/; s/@%/@@/; s/%g$/@g/; /@g$/s/[\\\\&%]/\\\\&/g; 
- s/@@/%@/; s/@@/@%/; s/@g$/%g/' > conftest.subs <<\CEOF
-$ac_vpsub
-$extrasub
-s%@CFLAGS@%$CFLAGS%g
-s%@CPPFLAGS@%$CPPFLAGS%g
-s%@CXXFLAGS@%$CXXFLAGS%g
-s%@DEFS@%$DEFS%g
-s%@LDFLAGS@%$LDFLAGS%g
-s%@LIBS@%$LIBS%g
-s%@exec_prefix@%$exec_prefix%g
-s%@prefix@%$prefix%g
-s%@program_transform_name@%$program_transform_name%g
-s%@CC@%$CC%g
-s%@CPP@%$CPP%g
-s%@INSTALL_PROGRAM@%$INSTALL_PROGRAM%g
-s%@INSTALL_DATA@%$INSTALL_DATA%g
-s%@LIBOBJS@%$LIBOBJS%g
-s%@ALLOCA@%$ALLOCA%g
-
-CEOF
-EOF
-cat >> $CONFIG_STATUS <<EOF
-
-CONFIG_FILES=\${CONFIG_FILES-"Makefile"}
-EOF
-cat >> $CONFIG_STATUS <<\EOF
-for ac_file in .. $CONFIG_FILES; do if test "x$ac_file" != x..; then
-  # Support "outfile[:infile]", defaulting infile="outfile.in".
-  case "$ac_file" in
-  *:*) ac_file_in=`echo "$ac_file"|sed 's%.*:%%'`
-       ac_file=`echo "$ac_file"|sed 's%:.*%%'` ;;
-  *) ac_file_in="${ac_file}.in" ;;
-  esac
-
-  # Adjust relative srcdir, etc. for subdirectories.
-
-  # Remove last slash and all that follows it.  Not all systems have dirname.
-  ac_dir=`echo $ac_file|sed 's%/[^/][^/]*$%%'`
-  if test "$ac_dir" != "$ac_file" && test "$ac_dir" != .; then
-    # The file is in a subdirectory.
-    test ! -d "$ac_dir" && mkdir "$ac_dir"
-    ac_dir_suffix="/$ac_dir"
-    # A "../" for each directory in $ac_dir_suffix.
-    ac_dots=`echo $ac_dir_suffix|sed 's%/[^/]*%../%g'`
-  else
-    ac_dir_suffix= ac_dots=
-  fi
-
-  case "$ac_given_srcdir" in
-  .)  srcdir=.
-      if test -z "$ac_dots"; then top_srcdir=.
-      else top_srcdir=`echo $ac_dots|sed 's%/$%%'`; fi ;;
-  /*) srcdir="$ac_given_srcdir$ac_dir_suffix"; top_srcdir="$ac_given_srcdir" ;;
-  *) # Relative path.
-    srcdir="$ac_dots$ac_given_srcdir$ac_dir_suffix"
-    top_srcdir="$ac_dots$ac_given_srcdir" ;;
-  esac
-
-  case "$ac_given_INSTALL" in
-  [/$]*) INSTALL="$ac_given_INSTALL" ;;
-  *) INSTALL="$ac_dots$ac_given_INSTALL" ;;
-  esac
-  echo creating "$ac_file"
-  rm -f "$ac_file"
-  configure_input="Generated automatically from `echo $ac_file_in|sed 's%.*/%%'` by configure."
-  case "$ac_file" in
-  *Makefile*) ac_comsub="1i\\
-# $configure_input" ;;
-  *) ac_comsub= ;;
-  esac
-  sed -e "$ac_comsub
-s%@configure_input@%$configure_input%g
-s%@srcdir@%$srcdir%g
-s%@top_srcdir@%$top_srcdir%g
-s%@INSTALL@%$INSTALL%g
-" -f conftest.subs $ac_given_srcdir/$ac_file_in > $ac_file
-fi; done
-rm -f conftest.subs
-
-# These sed commands are passed to sed as "A NAME B NAME C VALUE D", where
-# NAME is the cpp macro being defined and VALUE is the value it is being given.
-#
-# ac_d sets the value in "#define NAME VALUE" lines.
-ac_dA='s%^\([ 	]*\)#\([ 	]*define[ 	][ 	]*\)'
-ac_dB='\([ 	][ 	]*\)[^ 	]*%\1#\2'
-ac_dC='\3'
-ac_dD='%g'
-# ac_u turns "#undef NAME" with trailing blanks into "#define NAME VALUE".
-ac_uA='s%^\([ 	]*\)#\([ 	]*\)undef\([ 	][ 	]*\)'
-ac_uB='\([ 	]\)%\1#\2define\3'
-ac_uC=' '
-ac_uD='\4%g'
-# ac_e turns "#undef NAME" without trailing blanks into "#define NAME VALUE".
-ac_eA='s%^\([ 	]*\)#\([ 	]*\)undef\([ 	][ 	]*\)'
-ac_eB='$%\1#\2define\3'
-ac_eC=' '
-ac_eD='%g'
-
-CONFIG_HEADERS=${CONFIG_HEADERS-"config.h:config.hin"}
-for ac_file in .. $CONFIG_HEADERS; do if test "x$ac_file" != x..; then
-  # Support "outfile[:infile]", defaulting infile="outfile.in".
-  case "$ac_file" in
-  *:*) ac_file_in=`echo "$ac_file"|sed 's%.*:%%'`
-       ac_file=`echo "$ac_file"|sed 's%:.*%%'` ;;
-  *) ac_file_in="${ac_file}.in" ;;
-  esac
-
-  echo creating $ac_file
-
-  rm -f conftest.frag conftest.in conftest.out
-  cp $ac_given_srcdir/$ac_file_in conftest.in
-
-EOF
-
-# Transform confdefs.h into a sed script conftest.vals that substitutes
-# the proper values into config.h.in to produce config.h.  And first:
-# Protect against being on the right side of a sed subst in config.status. 
-# Protect against being in an unquoted here document in config.status.
-rm -f conftest.vals
-cat > conftest.hdr <<\EOF
-s/[\\&%]/\\&/g
-s%[\\$`]%\\&%g
-s%#define \([A-Za-z_][A-Za-z0-9_]*\) \(.*\)%${ac_dA}\1${ac_dB}\1${ac_dC}\2${ac_dD}%gp
-s%ac_d%ac_u%gp
-s%ac_u%ac_e%gp
-EOF
-sed -n -f conftest.hdr confdefs.h > conftest.vals
-rm -f conftest.hdr
-
-# This sed command replaces #undef with comments.  This is necessary, for
-# example, in the case of _POSIX_SOURCE, which is predefined and required
-# on some systems where configure will not decide to define it.
-cat >> conftest.vals <<\EOF
-s%^[ 	]*#[ 	]*undef[ 	][ 	]*[a-zA-Z_][a-zA-Z_0-9]*%/* & */%
-EOF
-
-# Break up conftest.vals because some shells have a limit on
-# the size of here documents, and old seds have small limits too.
-# Maximum number of lines to put in a single here document.
-ac_max_here_lines=12
-
-rm -f conftest.tail
-while :
-do
-  ac_lines=`grep -c . conftest.vals`
-  # grep -c gives empty output for an empty file on some AIX systems.
-  if test -z "$ac_lines" || test "$ac_lines" -eq 0; then break; fi
-  # Write a limited-size here document to conftest.frag.
-  echo '  cat > conftest.frag <<CEOF' >> $CONFIG_STATUS
-  sed ${ac_max_here_lines}q conftest.vals >> $CONFIG_STATUS
-  echo 'CEOF
-  sed -f conftest.frag conftest.in > conftest.out
-  rm -f conftest.in
-  mv conftest.out conftest.in
-' >> $CONFIG_STATUS
-  sed 1,${ac_max_here_lines}d conftest.vals > conftest.tail
-  rm -f conftest.vals
-  mv conftest.tail conftest.vals
-done
-rm -f conftest.vals
-
-cat >> $CONFIG_STATUS <<\EOF
-  rm -f conftest.frag conftest.h
-  echo "/* $ac_file.  Generated automatically by configure.  */" > conftest.h
-  cat conftest.in >> conftest.h
-  rm -f conftest.in
-  if cmp -s $ac_file conftest.h 2>/dev/null; then
-    echo "$ac_file is unchanged"
-    rm -f conftest.h
-  else
-    rm -f $ac_file
-    mv conftest.h $ac_file
-  fi
-fi; done
-
-
-date > stamp-h
-exit 0
-EOF
-chmod +x $CONFIG_STATUS
-rm -fr confdefs* $ac_clean_files
-test "$no_create" = yes || ${CONFIG_SHELL-/bin/sh} $CONFIG_STATUS
-
diff --git a/contrib/diff/configure.in b/contrib/diff/configure.in
deleted file mode 100644
index 1aa66d1..0000000
--- a/contrib/diff/configure.in
+++ /dev/null
@@ -1,26 +0,0 @@
-dnl Process this file with autoconf to produce a configure script.
-AC_INIT(diff.h)
-AC_CONFIG_HEADER(config.h:config.hin)
-AC_ARG_PROGRAM
-AC_PROG_CC
-AC_PROG_CPP
-AC_PROG_INSTALL
-AC_ISC_POSIX
-AC_MINIX
-AC_C_CONST
-AC_HEADER_STDC
-AC_CHECK_HEADERS(unistd.h fcntl.h limits.h stdlib.h string.h sys/file.h time.h)
-AC_HEADER_DIRENT
-AC_HEADER_STAT
-AC_HEADER_SYS_WAIT
-AC_TYPE_PID_T
-AC_TYPE_SIGNAL
-AC_CHECK_FUNCS(dup2 memchr sigaction strchr strerror tmpnam)
-AC_REPLACE_FUNCS(memchr waitpid)
-AC_FUNC_ALLOCA
-AC_FUNC_CLOSEDIR_VOID
-dnl No need for AC_FUNC_MEMCMP, since memcmp is used only to test for equality.
-AC_FUNC_VFORK
-AC_FUNC_VPRINTF
-AC_STRUCT_ST_BLKSIZE
-AC_OUTPUT(Makefile, [date > stamp-h])
diff --git a/contrib/diff/context.c b/contrib/diff/context.c
deleted file mode 100644
index 14f950c..0000000
--- a/contrib/diff/context.c
+++ /dev/null
@@ -1,468 +0,0 @@
-/* Context-format output routines for GNU DIFF.
-   Copyright (C) 1988,1989,1991,1992,1993,1994 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "diff.h"
-
-static struct change *find_hunk PARAMS((struct change *));
-static void find_function PARAMS((struct file_data const *, int, char const **, size_t *));
-static void mark_ignorable PARAMS((struct change *));
-static void pr_context_hunk PARAMS((struct change *));
-static void pr_unidiff_hunk PARAMS((struct change *));
-static void print_context_label PARAMS ((char const *, struct file_data *, char const *));
-static void print_context_number_range PARAMS((struct file_data const *, int, int));
-static void print_unidiff_number_range PARAMS((struct file_data const *, int, int));
-
-/* Last place find_function started searching from.  */
-static int find_function_last_search;
-
-/* The value find_function returned when it started searching there.  */
-static int find_function_last_match;
-
-/* Print a label for a context diff, with a file name and date or a label.  */
-
-static void
-print_context_label (mark, inf, label)
-     char const *mark;
-     struct file_data *inf;
-     char const *label;
-{
-  if (label)
-    fprintf (outfile, "%s %s\n", mark, label);
-  else
-    {
-      char const *ct = ctime (&inf->stat.st_mtime);
-      if (!ct)
-	ct = "?\n";
-      /* See Posix.2 section 4.17.6.1.4 for this format.  */
-      fprintf (outfile, "%s %s\t%s", mark, inf->name, ct);
-    }
-}
-
-/* Print a header for a context diff, with the file names and dates.  */
-
-void
-print_context_header (inf, unidiff_flag)
-     struct file_data inf[];
-     int unidiff_flag;
-{
-  if (unidiff_flag)
-    {
-      print_context_label ("---", &inf[0], file_label[0]);
-      print_context_label ("+++", &inf[1], file_label[1]);
-    }
-  else
-    {
-      print_context_label ("***", &inf[0], file_label[0]);
-      print_context_label ("---", &inf[1], file_label[1]);
-    }
-}
-
-/* Print an edit script in context format.  */
-
-void
-print_context_script (script, unidiff_flag)
-     struct change *script;
-     int unidiff_flag;
-{
-  if (ignore_blank_lines_flag || ignore_regexp_list)
-    mark_ignorable (script);
-  else
-    {
-      struct change *e;
-      for (e = script; e; e = e->link)
-	e->ignore = 0;
-    }
-
-  find_function_last_search = - files[0].prefix_lines;
-  find_function_last_match = find_function_last_search - 1;
-
-  if (unidiff_flag)
-    print_script (script, find_hunk, pr_unidiff_hunk);
-  else
-    print_script (script, find_hunk, pr_context_hunk);
-}
-
-/* Print a pair of line numbers with a comma, translated for file FILE.
-   If the second number is not greater, use the first in place of it.
-
-   Args A and B are internal line numbers.
-   We print the translated (real) line numbers.  */
-
-static void
-print_context_number_range (file, a, b)
-     struct file_data const *file;
-     int a, b;
-{
-  int trans_a, trans_b;
-  translate_range (file, a, b, &trans_a, &trans_b);
-
-  /* Note: we can have B < A in the case of a range of no lines.
-     In this case, we should print the line number before the range,
-     which is B.  */
-  if (trans_b > trans_a)
-    fprintf (outfile, "%d,%d", trans_a, trans_b);
-  else
-    fprintf (outfile, "%d", trans_b);
-}
-
-/* Print a portion of an edit script in context format.
-   HUNK is the beginning of the portion to be printed.
-   The end is marked by a `link' that has been nulled out.
-
-   Prints out lines from both files, and precedes each
-   line with the appropriate flag-character.  */
-
-static void
-pr_context_hunk (hunk)
-     struct change *hunk;
-{
-  int first0, last0, first1, last1, show_from, show_to, i;
-  struct change *next;
-  char const *prefix;
-  char const *function;
-  size_t function_length;
-  FILE *out;
-
-  /* Determine range of line numbers involved in each file.  */
-
-  analyze_hunk (hunk, &first0, &last0, &first1, &last1, &show_from, &show_to);
-
-  if (!show_from && !show_to)
-    return;
-
-  /* Include a context's width before and after.  */
-
-  i = - files[0].prefix_lines;
-  first0 = max (first0 - context, i);
-  first1 = max (first1 - context, i);
-  last0 = min (last0 + context, files[0].valid_lines - 1);
-  last1 = min (last1 + context, files[1].valid_lines - 1);
-
-  /* If desired, find the preceding function definition line in file 0.  */
-  function = 0;
-  if (function_regexp_list)
-    find_function (&files[0], first0, &function, &function_length);
-
-  begin_output ();
-  out = outfile;
-
-  /* If we looked for and found a function this is part of,
-     include its name in the header of the diff section.  */
-  fprintf (out, "***************");
-
-  if (function)
-    {
-      fprintf (out, " ");
-      fwrite (function, 1, min (function_length - 1, 40), out);
-    }
-
-  fprintf (out, "\n*** ");
-  print_context_number_range (&files[0], first0, last0);
-  fprintf (out, " ****\n");
-
-  if (show_from)
-    {
-      next = hunk;
-
-      for (i = first0; i <= last0; i++)
-	{
-	  /* Skip past changes that apply (in file 0)
-	     only to lines before line I.  */
-
-	  while (next && next->line0 + next->deleted <= i)
-	    next = next->link;
-
-	  /* Compute the marking for line I.  */
-
-	  prefix = " ";
-	  if (next && next->line0 <= i)
-	    /* The change NEXT covers this line.
-	       If lines were inserted here in file 1, this is "changed".
-	       Otherwise it is "deleted".  */
-	    prefix = (next->inserted > 0 ? "!" : "-");
-
-	  print_1_line (prefix, &files[0].linbuf[i]);
-	}
-    }
-
-  fprintf (out, "--- ");
-  print_context_number_range (&files[1], first1, last1);
-  fprintf (out, " ----\n");
-
-  if (show_to)
-    {
-      next = hunk;
-
-      for (i = first1; i <= last1; i++)
-	{
-	  /* Skip past changes that apply (in file 1)
-	     only to lines before line I.  */
-
-	  while (next && next->line1 + next->inserted <= i)
-	    next = next->link;
-
-	  /* Compute the marking for line I.  */
-
-	  prefix = " ";
-	  if (next && next->line1 <= i)
-	    /* The change NEXT covers this line.
-	       If lines were deleted here in file 0, this is "changed".
-	       Otherwise it is "inserted".  */
-	    prefix = (next->deleted > 0 ? "!" : "+");
-
-	  print_1_line (prefix, &files[1].linbuf[i]);
-	}
-    }
-}
-
-/* Print a pair of line numbers with a comma, translated for file FILE.
-   If the second number is smaller, use the first in place of it.
-   If the numbers are equal, print just one number.
-
-   Args A and B are internal line numbers.
-   We print the translated (real) line numbers.  */
-
-static void
-print_unidiff_number_range (file, a, b)
-     struct file_data const *file;
-     int a, b;
-{
-  int trans_a, trans_b;
-  translate_range (file, a, b, &trans_a, &trans_b);
-
-  /* Note: we can have B < A in the case of a range of no lines.
-     In this case, we should print the line number before the range,
-     which is B.  */
-  if (trans_b <= trans_a)
-    fprintf (outfile, trans_b == trans_a ? "%d" : "%d,0", trans_b);
-  else
-    fprintf (outfile, "%d,%d", trans_a, trans_b - trans_a + 1);
-}
-
-/* Print a portion of an edit script in unidiff format.
-   HUNK is the beginning of the portion to be printed.
-   The end is marked by a `link' that has been nulled out.
-
-   Prints out lines from both files, and precedes each
-   line with the appropriate flag-character.  */
-
-static void
-pr_unidiff_hunk (hunk)
-     struct change *hunk;
-{
-  int first0, last0, first1, last1, show_from, show_to, i, j, k;
-  struct change *next;
-  char const *function;
-  size_t function_length;
-  FILE *out;
-
-  /* Determine range of line numbers involved in each file.  */
-
-  analyze_hunk (hunk, &first0, &last0, &first1, &last1, &show_from, &show_to);
-
-  if (!show_from && !show_to)
-    return;
-
-  /* Include a context's width before and after.  */
-
-  i = - files[0].prefix_lines;
-  first0 = max (first0 - context, i);
-  first1 = max (first1 - context, i);
-  last0 = min (last0 + context, files[0].valid_lines - 1);
-  last1 = min (last1 + context, files[1].valid_lines - 1);
-
-  /* If desired, find the preceding function definition line in file 0.  */
-  function = 0;
-  if (function_regexp_list)
-    find_function (&files[0], first0, &function, &function_length);
-
-  begin_output ();
-  out = outfile;
-
-  fprintf (out, "@@ -");
-  print_unidiff_number_range (&files[0], first0, last0);
-  fprintf (out, " +");
-  print_unidiff_number_range (&files[1], first1, last1);
-  fprintf (out, " @@");
-
-  /* If we looked for and found a function this is part of,
-     include its name in the header of the diff section.  */
-
-  if (function)
-    {
-      putc (' ', out);
-      fwrite (function, 1, min (function_length - 1, 40), out);
-    }
-  putc ('\n', out);
-
-  next = hunk;
-  i = first0;
-  j = first1;
-
-  while (i <= last0 || j <= last1)
-    {
-
-      /* If the line isn't a difference, output the context from file 0. */
-
-      if (!next || i < next->line0)
-	{
-	  putc (tab_align_flag ? '\t' : ' ', out);
-	  print_1_line (0, &files[0].linbuf[i++]);
-	  j++;
-	}
-      else
-	{
-	  /* For each difference, first output the deleted part. */
-
-	  k = next->deleted;
-	  while (k--)
-	    {
-	      putc ('-', out);
-	      if (tab_align_flag)
-		putc ('\t', out);
-	      print_1_line (0, &files[0].linbuf[i++]);
-	    }
-
-	  /* Then output the inserted part. */
-
-	  k = next->inserted;
-	  while (k--)
-	    {
-	      putc ('+', out);
-	      if (tab_align_flag)
-		putc ('\t', out);
-	      print_1_line (0, &files[1].linbuf[j++]);
-	    }
-
-	  /* We're done with this hunk, so on to the next! */
-
-	  next = next->link;
-	}
-    }
-}
-
-/* Scan a (forward-ordered) edit script for the first place that more than
-   2*CONTEXT unchanged lines appear, and return a pointer
-   to the `struct change' for the last change before those lines.  */
-
-static struct change *
-find_hunk (start)
-     struct change *start;
-{
-  struct change *prev;
-  int top0, top1;
-  int thresh;
-
-  do
-    {
-      /* Compute number of first line in each file beyond this changed.  */
-      top0 = start->line0 + start->deleted;
-      top1 = start->line1 + start->inserted;
-      prev = start;
-      start = start->link;
-      /* Threshold distance is 2*CONTEXT between two non-ignorable changes,
-	 but only CONTEXT if one is ignorable.  */
-      thresh = ((prev->ignore || (start && start->ignore))
-		? context
-		: 2 * context + 1);
-      /* It is not supposed to matter which file we check in the end-test.
-	 If it would matter, crash.  */
-      if (start && start->line0 - top0 != start->line1 - top1)
-	abort ();
-    } while (start
-	     /* Keep going if less than THRESH lines
-		elapse before the affected line.  */
-	     && start->line0 < top0 + thresh);
-
-  return prev;
-}
-
-/* Set the `ignore' flag properly in each change in SCRIPT.
-   It should be 1 if all the lines inserted or deleted in that change
-   are ignorable lines.  */
-
-static void
-mark_ignorable (script)
-     struct change *script;
-{
-  while (script)
-    {
-      struct change *next = script->link;
-      int first0, last0, first1, last1, deletes, inserts;
-
-      /* Turn this change into a hunk: detach it from the others.  */
-      script->link = 0;
-
-      /* Determine whether this change is ignorable.  */
-      analyze_hunk (script, &first0, &last0, &first1, &last1, &deletes, &inserts);
-      /* Reconnect the chain as before.  */
-      script->link = next;
-
-      /* If the change is ignorable, mark it.  */
-      script->ignore = (!deletes && !inserts);
-
-      /* Advance to the following change.  */
-      script = next;
-    }
-}
-
-/* Find the last function-header line in FILE prior to line number LINENUM.
-   This is a line containing a match for the regexp in `function_regexp'.
-   Store the address of the line text into LINEP and the length of the
-   line into LENP.
-   Do not store anything if no function-header is found.  */
-
-static void
-find_function (file, linenum, linep, lenp)
-     struct file_data const *file;
-     int linenum;
-     char const **linep;
-     size_t *lenp;
-{
-  int i = linenum;
-  int last = find_function_last_search;
-  find_function_last_search = i;
-
-  while (--i >= last)
-    {
-      /* See if this line is what we want.  */
-      struct regexp_list *r;
-      char const *line = file->linbuf[i];
-      size_t len = file->linbuf[i + 1] - line;
-
-      for (r = function_regexp_list; r; r = r->next)
-	if (0 <= re_search (&r->buf, line, len, 0, len, 0))
-	  {
-	    *linep = line;
-	    *lenp = len;
-	    find_function_last_match = i;
-	    return;
-	  }
-    }
-  /* If we search back to where we started searching the previous time,
-     find the line we found last time.  */
-  if (find_function_last_match >= - file->prefix_lines)
-    {
-      i = find_function_last_match;
-      *linep = file->linbuf[i];
-      *lenp = file->linbuf[i + 1] - *linep;
-      return;
-    }
-  return;
-}
diff --git a/contrib/diff/diagmeet.note b/contrib/diff/diagmeet.note
deleted file mode 100644
index 8f7242c..0000000
--- a/contrib/diff/diagmeet.note
+++ /dev/null
@@ -1,71 +0,0 @@
-Here is a comparison matrix which shows a case in which
-it is possible for the forward and backward scan in `diag'
-to meet along a nonzero length of diagonal simultaneous
-(so that bdiag[d] and fdiag[d] are not equal)
-even though there is no snake on that diagonal at the meeting point.
-
-
-     85   1   1   1  159  1   1   17
-        1   2   3   4
-60
-    1   2
-1
-    2  	    2   3   4
-71
-    3       3  	4   5
-85
-    4  	3   4	5
-17
-    5  	4   5
-1
-    6       4  	5   6
-183
-    7       5   6   7
-10
-    8  	    6  	7
-1
-    9           6   7  	8
-12
-                7   8   9  10
-13
-       10       8   9  10
-14
-           10   9  10
-17
-       10      10
-1
-   10   9  10
-1
-	8      10      10      10
-183
-    8   7	9       9      	9
-10
-    7   6	8   9   8      	8
-1
-    6   5    		7       7
-1
-            5          	6      	6
-1
-	       	5      	5      	5
-50
-	    5   4      	4      	4
-1
-	            4   3	3
-85
-	    5   4   3   2       2
-1
-	                    2   1
-17
-	    5   4   3   2   1       1
-1
-		                1   0
-     85   1   1   1  159  1   1  17
-
-
-
-
-
-
-
-
-
diff --git a/contrib/diff/diff.texi b/contrib/diff/diff.texi
deleted file mode 100644
index 7551acb..0000000
--- a/contrib/diff/diff.texi
+++ /dev/null
@@ -1,3916 +0,0 @@
-\input texinfo @c -*-texinfo-*-
-@c %**start of header
-@setfilename diff.info
-@settitle Comparing and Merging Files
-@setchapternewpage odd
-@c %**end of header
-
-@ifinfo
-This file documents the the GNU @code{diff}, @code{diff3}, @code{sdiff},
-and @code{cmp} commands for showing the differences between text files
-and the @code{patch} command for using their output to update files.
-
-Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
-
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
-
-@ignore
-Permission is granted to process this file through TeX and print the
-results, provided the printed document carries copying permission
-notice identical to this one except for the removal of this paragraph
-(this paragraph not being relevant to the printed manual).
-
-@end ignore
-Permission is granted to copy and distribute modified versions of this
-manual under the conditions for verbatim copying, provided that the entire
-resulting derived work is distributed under the terms of a permission
-notice identical to this one.
-
-Permission is granted to copy and distribute translations of this manual
-into another language, under the above conditions for modified versions,
-except that this permission notice may be stated in a translation approved
-by the Foundation.
-@end ifinfo
-
-@titlepage
-@title Comparing and Merging Files
-@subtitle @code{diff}, @code{diff3}, @code{sdiff}, @code{cmp}, and @code{patch}
-@subtitle Edition 1.3, for @code{diff} 2.5 and @code{patch} 2.1
-@subtitle September 1993
-@author by David MacKenzie, Paul Eggert, and Richard Stallman
-
-@page
-@vskip 0pt plus 1filll
-Copyright @copyright{} 1992, 1993, 1994 Free Software Foundation, Inc.
-
-Permission is granted to make and distribute verbatim copies of
-this manual provided the copyright notice and this permission notice
-are preserved on all copies.
-
-Permission is granted to copy and distribute modified versions of this
-manual under the conditions for verbatim copying, provided that the entire
-resulting derived work is distributed under the terms of a permission
-notice identical to this one.
-
-Permission is granted to copy and distribute translations of this manual
-into another language, under the above conditions for modified versions,
-except that this permission notice may be stated in a translation approved
-by the Foundation.
-@end titlepage
-
-@node Top, , , (dir)
-
-@ifinfo
-This file documents the the GNU @code{diff}, @code{diff3}, @code{sdiff},
-and @code{cmp} commands for showing the differences between text files
-and the @code{patch} command for using their output to update files.
-
-This is Edition 1.2, for @code{diff} 2.4 and @code{patch} 2.1.
-@end ifinfo
-
-@menu
-* Overview::		Preliminary information.
-
-* Comparison::		What file comparison means.
-* Output Formats::	Formats for difference reports.
-* Comparing Directories::	Comparing files and directories.
-* Adjusting Output::	Making @code{diff} output prettier.
-* diff Performance::	Making @code{diff} smarter or faster.
-* Comparing Three Files:: Formats for three-way difference reports.
-
-* diff3 Merging::	Merging from a common ancestor.
-* Interactive Merging::	Interactive merging with @code{sdiff}.
-* Merging with patch::	Using @code{patch} to change old files into new ones.
-* Making Patches::	Tips for making patch distributions.
-
-* Invoking cmp::	How to run @code{cmp} and a summary of its options.
-* Invoking diff::	How to run @code{diff} and a summary of its options.
-* Invoking diff3::	How to run @code{diff3} and a summary of its options.
-* Invoking patch::	How to run @code{patch} and a summary of its options.
-* Invoking sdiff::	How to run @code{sdiff} and a summary of its options.
-
-* Incomplete Lines::	Lines that lack trailing newlines.
-* Projects::		If you think you've found a bug or other shortcoming.
-
-* Concept Index::	Index of concepts.
-@end menu
-
-@node Overview, Comparison, , Top
-@unnumbered Overview
-@cindex overview of @code{diff} and @code{patch}
-
-Computer users often find occasion to ask how two files differ.  Perhaps
-one file is a newer version of the other file.  Or maybe the two files
-started out as identical copies but were changed by different people.
-
-You can use the @code{diff} command to show differences between two
-files, or each corresponding file in two directories.  @code{diff}
-outputs differences between files line by line in any of several
-formats, selectable by command line options.  This set of differences is
-often called a @dfn{diff} or @dfn{patch}.  For files that are identical,
-@code{diff} normally produces no output; for binary (non-text) files,
-@code{diff} normally reports only that they are different.
-
-You can use the @code{cmp} command to show the offsets and line numbers
-where two files differ.  @code{cmp} can also show all the characters
-that differ between the two files, side by side.  Another way to compare
-two files character by character is the Emacs command @kbd{M-x
-compare-windows}.  @xref{Other Window, , Other Window, emacs, The GNU
-Emacs Manual}, for more information on that command.
-
-You can use the @code{diff3} command to show differences among three
-files.  When two people have made independent changes to a common
-original, @code{diff3} can report the differences between the original
-and the two changed versions, and can produce a merged file that
-contains both persons' changes together with warnings about conflicts.
-
-You can use the @code{sdiff} command to merge two files interactively.
-
-You can use the set of differences produced by @code{diff} to distribute
-updates to text files (such as program source code) to other people.
-This method is especially useful when the differences are small compared
-to the complete files.  Given @code{diff} output, you can use the
-@code{patch} program to update, or @dfn{patch}, a copy of the file.  If you
-think of @code{diff} as subtracting one file from another to produce
-their difference, you can think of @code{patch} as adding the difference
-to one file to reproduce the other.
-
-This manual first concentrates on making diffs, and later shows how to
-use diffs to update files.
-
-GNU @code{diff} was written by Mike Haertel, David Hayes, Richard
-Stallman, Len Tower, and Paul Eggert.  Wayne Davison designed and
-implemented the unified output format.  The basic algorithm is described
-in ``An O(ND) Difference Algorithm and its Variations'', Eugene W. Myers,
-@cite{Algorithmica} Vol.@: 1 No.@: 2, 1986, pp.@: 251--266; and in ``A File
-Comparison Program'', Webb Miller and Eugene W. Myers,
-@cite{Software---Practice and Experience} Vol.@: 15 No.@: 11, 1985,
-pp.@: 1025--1040.
-@c From: "Gene Myers" <gene@cs.arizona.edu>
-@c They are about the same basic algorithm; the Algorithmica
-@c paper gives a rigorous treatment and the sub-algorithm for
-@c delivering scripts and should be the primary reference, but
-@c both should be mentioned.
-The algorithm was independently discovered as described in
-``Algorithms for Approximate String Matching'',
-E. Ukkonen, @cite{Information and Control} Vol.@: 64, 1985, pp.@: 100--118.
-@c From: "Gene Myers" <gene@cs.arizona.edu>
-@c Date: Wed, 29 Sep 1993 08:27:55 MST
-@c Ukkonen should be given credit for also discovering the algorithm used
-@c in GNU diff.
-
-GNU @code{diff3} was written by Randy Smith.  GNU @code{sdiff} was
-written by Thomas Lord.  GNU @code{cmp} was written by Torbjorn Granlund
-and David MacKenzie.
-
-@code{patch} was written mainly by Larry Wall; the GNU enhancements were
-written mainly by Wayne Davison and David MacKenzie.  Parts of this
-manual are adapted from a manual page written by Larry Wall, with his
-permission.
-
-@node Comparison, Output Formats, Overview, Top
-@chapter What Comparison Means
-@cindex introduction
-
-There are several ways to think about the differences between two files.
-One way to think of the differences is as a series of lines that were
-deleted from, inserted in, or changed in one file to produce the other
-file.  @code{diff} compares two files line by line, finds groups of
-lines that differ, and reports each group of differing lines.  It can
-report the differing lines in several formats, which have different
-purposes.
-
-GNU @code{diff} can show whether files are different without detailing
-the differences.  It also provides ways to suppress certain kinds of
-differences that are not important to you.  Most commonly, such
-differences are changes in the amount of white space between words or
-lines.  @code{diff} also provides ways to suppress differences in
-alphabetic case or in lines that match a regular expression that you
-provide.  These options can accumulate; for example, you can ignore
-changes in both white space and alphabetic case.
-
-Another way to think of the differences between two files is as a
-sequence of pairs of characters that can be either identical or
-different.  @code{cmp} reports the differences between two files
-character by character, instead of line by line.  As a result, it is
-more useful than @code{diff} for comparing binary files.  For text
-files, @code{cmp} is useful mainly when you want to know only whether
-two files are identical.
-
-To illustrate the effect that considering changes character by character
-can have compared with considering them line by line, think of what
-happens if a single newline character is added to the beginning of a
-file.  If that file is then compared with an otherwise identical file
-that lacks the newline at the beginning, @code{diff} will report that a
-blank line has been added to the file, while @code{cmp} will report that
-almost every character of the two files differs.
-
-@code{diff3} normally compares three input files line by line, finds
-groups of lines that differ, and reports each group of differing lines.
-Its output is designed to make it easy to inspect two different sets of
-changes to the same file.
-
-@menu
-* Hunks::		Groups of differing lines.
-* White Space::		Suppressing differences in white space.
-* Blank Lines::		Suppressing differences in blank lines.
-* Case Folding::	Suppressing differences in alphabetic case.
-* Specified Folding::	Suppressing differences that match regular expressions.
-* Brief::		Summarizing which files are different.
-* Binary::		Comparing binary files or forcing text comparisons.
-@end menu
-
-@node Hunks, White Space, , Comparison
-@section Hunks
-@cindex hunks
-
-When comparing two files, @code{diff} finds sequences of lines common to
-both files, interspersed with groups of differing lines called
-@dfn{hunks}.  Comparing two identical files yields one sequence of
-common lines and no hunks, because no lines differ.  Comparing two
-entirely different files yields no common lines and one large hunk that
-contains all lines of both files.  In general, there are many ways to
-match up lines between two given files.  @code{diff} tries to minimize
-the total hunk size by finding large sequences of common lines
-interspersed with small hunks of differing lines.
-
-For example, suppose the file @file{F} contains the three lines
-@samp{a}, @samp{b}, @samp{c}, and the file @file{G} contains the same
-three lines in reverse order @samp{c}, @samp{b}, @samp{a}.  If
-@code{diff} finds the line @samp{c} as common, then the command
-@samp{diff F G} produces this output:
-
-@example
-1,2d0
-< a
-< b
-3a2,3
-> b
-> a
-@end example
-
-@noindent
-But if @code{diff} notices the common line @samp{b} instead, it produces
-this output:
-
-@example
-1c1
-< a
----
-> c
-3c3
-< c
----
-> a
-@end example
-
-@noindent
-It is also possible to find @samp{a} as the common line.  @code{diff}
-does not always find an optimal matching between the files; it takes
-shortcuts to run faster.  But its output is usually close to the
-shortest possible.  You can adjust this tradeoff with the
-@samp{--minimal} option (@pxref{diff Performance}).
-
-@node White Space, Blank Lines, Hunks, Comparison
-@section Suppressing Differences in Blank and Tab Spacing
-@cindex blank and tab difference suppression
-@cindex tab and blank difference suppression
-
-The @samp{-b} and @samp{--ignore-space-change} options ignore white space
-at line end, and considers all other sequences of one or more
-white space characters to be equivalent.  With these options,
-@code{diff} considers the following two lines to be equivalent, where
-@samp{$} denotes the line end:
-
-@example
-Here lyeth  muche rychnesse  in lytell space.   -- John Heywood$
-Here lyeth muche rychnesse in lytell space. -- John Heywood   $
-@end example
-
-The @samp{-w} and @samp{--ignore-all-space} options are stronger than
-@samp{-b}.  They ignore difference even if one file has white space where
-the other file has none.  @dfn{White space} characters include
-tab, newline, vertical tab, form feed, carriage return, and space;
-some locales may define additional characters to be white space.
-With these options, @code{diff} considers the
-following two lines to be equivalent, where @samp{$} denotes the line
-end and @samp{^M} denotes a carriage return:
-
-@example
-Here lyeth  muche  rychnesse in lytell space.--  John Heywood$
-  He relyeth much erychnes  seinly tells pace.  --John Heywood   ^M$
-@end example
-
-@node Blank Lines, Case Folding, White Space, Comparison
-@section Suppressing Differences in Blank Lines
-@cindex blank line difference suppression
-
-The @samp{-B} and @samp{--ignore-blank-lines} options ignore insertions
-or deletions of blank lines.  These options normally affect only lines
-that are completely empty; they do not affect lines that look empty but
-contain space or tab characters.  With these options, for example, a
-file containing
-@example
-1.  A point is that which has no part.
-
-2.  A line is breadthless length.
--- Euclid, The Elements, I
-@end example
-@noindent
-is considered identical to a file containing
-@example
-1.  A point is that which has no part.
-2.  A line is breadthless length.
-
-
--- Euclid, The Elements, I
-@end example
-
-@node Case Folding, Specified Folding, Blank Lines, Comparison
-@section Suppressing Case Differences
-@cindex case difference suppression
-
-GNU @code{diff} can treat lowercase letters as equivalent to their
-uppercase counterparts, so that, for example, it considers @samp{Funky
-Stuff}, @samp{funky STUFF}, and @samp{fUNKy stuFf} to all be the same.
-To request this, use the @samp{-i} or @samp{--ignore-case} option.
-
-@node Specified Folding, Brief, Case Folding, Comparison
-@section Suppressing Lines Matching a Regular Expression
-@cindex regular expression suppression
-
-To ignore insertions and deletions of lines that match a regular
-expression, use the @samp{-I @var{regexp}} or
-@samp{--ignore-matching-lines=@var{regexp}} option.  You should escape
-regular expressions that contain shell metacharacters to prevent the
-shell from expanding them.  For example, @samp{diff -I '^[0-9]'} ignores
-all changes to lines beginning with a digit.
-
-However, @samp{-I} only ignores the insertion or deletion of lines that
-contain the regular expression if every changed line in the hunk---every
-insertion and every deletion---matches the regular expression.  In other
-words, for each nonignorable change, @code{diff} prints the complete set
-of changes in its vicinity, including the ignorable ones.
-
-You can specify more than one regular expression for lines to ignore by
-using more than one @samp{-I} option.  @code{diff} tries to match each
-line against each regular expression, starting with the last one given.
-
-@node Brief, Binary, Specified Folding, Comparison
-@section Summarizing Which Files Differ
-@cindex summarizing which files differ
-@cindex brief difference reports
-
-When you only want to find out whether files are different, and you
-don't care what the differences are, you can use the summary output
-format.  In this format, instead of showing the differences between the
-files, @code{diff} simply reports whether files differ.  The @samp{-q}
-and @samp{--brief} options select this output format.
-
-This format is especially useful when comparing the contents of two
-directories.  It is also much faster than doing the normal line by line
-comparisons, because @code{diff} can stop analyzing the files as soon as
-it knows that there are any differences.
-
-You can also get a brief indication of whether two files differ by using
-@code{cmp}.  For files that are identical, @code{cmp} produces no
-output.  When the files differ, by default, @code{cmp} outputs the byte
-offset and line number where the first difference occurs.  You can use
-the @samp{-s} option to suppress that information, so that @code{cmp}
-produces no output and reports whether the files differ using only its
-exit status (@pxref{Invoking cmp}).
-
-@c Fix this.
-Unlike @code{diff}, @code{cmp} cannot compare directories; it can only
-compare two files.
-
-@node Binary, , Brief, Comparison
-@section Binary Files and Forcing Text Comparisons
-@cindex binary file diff
-@cindex text versus binary diff
-
-If @code{diff} thinks that either of the two files it is comparing is
-binary (a non-text file), it normally treats that pair of files much as
-if the summary output format had been selected (@pxref{Brief}), and
-reports only that the binary files are different.  This is because line
-by line comparisons are usually not meaningful for binary files.
-
-@code{diff} determines whether a file is text or binary by checking the
-first few bytes in the file; the exact number of bytes is system
-dependent, but it is typically several thousand.  If every character in
-that part of the file is non-null, @code{diff} considers the file to be
-text; otherwise it considers the file to be binary.
-
-Sometimes you might want to force @code{diff} to consider files to be
-text.  For example, you might be comparing text files that contain
-null characters; @code{diff} would erroneously decide that those are
-non-text files.  Or you might be comparing documents that are in a
-format used by a word processing system that uses null characters to
-indicate special formatting.  You can force @code{diff} to consider all
-files to be text files, and compare them line by line, by using the
-@samp{-a} or @samp{--text} option.  If the files you compare using this
-option do not in fact contain text, they will probably contain few
-newline characters, and the @code{diff} output will consist of hunks
-showing differences between long lines of whatever characters the files
-contain.
-
-You can also force @code{diff} to consider all files to be binary files,
-and report only whether they differ (but not how).  Use the
-@samp{--brief} option for this.
-
-In operating systems that distinguish between text and binary files,
-@code{diff} normally reads and writes all data as text.  Use the
-@samp{--binary} option to force @code{diff} to read and write binary
-data instead.  This option has no effect on a Posix-compliant system
-like GNU or traditional Unix.  However, many personal computer
-operating systems represent the end of a line with a carriage return
-followed by a newline.  On such systems, @code{diff} normally ignores
-these carriage returns on input and generates them at the end of each
-output line, but with the @samp{--binary} option @code{diff} treats
-each carriage return as just another input character, and does not
-generate a carriage return at the end of each output line.  This can be
-useful when dealing with non-text files that are meant to be
-interchanged with Posix-compliant systems.
-
-If you want to compare two files byte by byte, you can use the
-@code{cmp} program with the @samp{-l} option to show the values of each
-differing byte in the two files.  With GNU @code{cmp}, you can also use
-the @samp{-c} option to show the ASCII representation of those bytes.
-@xref{Invoking cmp}, for more information.
-
-If @code{diff3} thinks that any of the files it is comparing is binary
-(a non-text file), it normally reports an error, because such
-comparisons are usually not useful.  @code{diff3} uses the same test as
-@code{diff} to decide whether a file is binary.  As with @code{diff}, if
-the input files contain a few non-text characters but otherwise are like
-text files, you can force @code{diff3} to consider all files to be text
-files and compare them line by line by using the @samp{-a} or
-@samp{--text} options.
-
-@node Output Formats, Comparing Directories, Comparison, Top
-@chapter @code{diff} Output Formats
-@cindex output formats
-@cindex format of @code{diff} output
-
-@code{diff} has several mutually exclusive options for output format.
-The following sections describe each format, illustrating how
-@code{diff} reports the differences between two sample input files.
-
-@menu
-* Sample diff Input::	Sample @code{diff} input files for examples.
-* Normal::		Showing differences without surrounding text.
-* Context::		Showing differences with the surrounding text.
-* Side by Side::        Showing differences in two columns.
-* Scripts::		Generating scripts for other programs.
-* If-then-else::	Merging files with if-then-else.
-@end menu
-
-@node Sample diff Input, Normal, , Output Formats
-@section Two Sample Input Files
-@cindex @code{diff} sample input
-@cindex sample input for @code{diff}
-
-Here are two sample files that we will use in numerous examples to
-illustrate the output of @code{diff} and how various options can change
-it.
-
-This is the file @file{lao}:
-
-@example
-The Way that can be told of is not the eternal Way;
-The name that can be named is not the eternal name.
-The Nameless is the origin of Heaven and Earth;
-The Named is the mother of all things.
-Therefore let there always be non-being,
-  so we may see their subtlety,
-And let there always be being,
-  so we may see their outcome.
-The two are the same,
-But after they are produced,
-  they have different names.
-@end example
-
-This is the file @file{tzu}:
-
-@example
-The Nameless is the origin of Heaven and Earth;
-The named is the mother of all things.
-
-Therefore let there always be non-being,
-  so we may see their subtlety,
-And let there always be being,
-  so we may see their outcome.
-The two are the same,
-But after they are produced,
-  they have different names.
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-@end example
-
-In this example, the first hunk contains just the first two lines of
-@file{lao}, the second hunk contains the fourth line of @file{lao}
-opposing the second and third lines of @file{tzu}, and the last hunk
-contains just the last three lines of @file{tzu}.
-
-@node Normal, Context, Sample diff Input, Output Formats
-@section Showing Differences Without Context
-@cindex normal output format
-@cindex @samp{<} output format
-
-The ``normal'' @code{diff} output format shows each hunk of differences
-without any surrounding context.  Sometimes such output is the clearest
-way to see how lines have changed, without the clutter of nearby
-unchanged lines (although you can get similar results with the context
-or unified formats by using 0 lines of context).  However, this format
-is no longer widely used for sending out patches; for that purpose, the
-context format (@pxref{Context Format}) and the unified format
-(@pxref{Unified Format}) are superior.  Normal format is the default for
-compatibility with older versions of @code{diff} and the Posix standard.
-
-@menu
-* Detailed Normal::	A detailed description of normal output format.
-* Example Normal::	Sample output in the normal format.
-@end menu
-
-@node Detailed Normal, Example Normal, , Normal
-@subsection Detailed Description of Normal Format
-
-The normal output format consists of one or more hunks of differences;
-each hunk shows one area where the files differ.  Normal format hunks
-look like this:
-
-@example
-@var{change-command}
-< @var{from-file-line}
-< @var{from-file-line}@dots{}
----
-> @var{to-file-line}
-> @var{to-file-line}@dots{}
-@end example
-
-There are three types of change commands.  Each consists of a line
-number or comma-separated range of lines in the first file, a single
-character indicating the kind of change to make, and a line number or
-comma-separated range of lines in the second file.  All line numbers are
-the original line numbers in each file.  The types of change commands
-are:
-
-@table @samp
-@item @var{l}a@var{r}
-Add the lines in range @var{r} of the second file after line @var{l} of
-the first file.  For example, @samp{8a12,15} means append lines 12--15
-of file 2 after line 8 of file 1; or, if changing file 2 into file 1,
-delete lines 12--15 of file 2.
-
-@item @var{f}c@var{t}
-Replace the lines in range @var{f} of the first file with lines in range
-@var{t} of the second file.  This is like a combined add and delete, but
-more compact.  For example, @samp{5,7c8,10} means change lines 5--7 of
-file 1 to read as lines 8--10 of file 2; or, if changing file 2 into
-file 1, change lines 8--10 of file 2 to read as lines 5--7 of file 1.
-
-@item @var{r}d@var{l}
-Delete the lines in range @var{r} from the first file; line @var{l} is where
-they would have appeared in the second file had they not been deleted.
-For example, @samp{5,7d3} means delete lines 5--7 of file 1; or, if
-changing file 2 into file 1, append lines 5--7 of file 1 after line 3 of
-file 2.
-@end table
-
-@node Example Normal, , Detailed Normal, Normal
-@subsection An Example of Normal Format
-
-Here is the output of the command @samp{diff lao tzu}
-(@pxref{Sample diff Input}, for the complete contents of the two files).
-Notice that it shows only the lines that are different between the two
-files.
-
-@example
-1,2d0
-< The Way that can be told of is not the eternal Way;
-< The name that can be named is not the eternal name.
-4c2,3
-< The Named is the mother of all things.
----
-> The named is the mother of all things.
-> 
-11a11,13
-> They both may be called deep and profound.
-> Deeper and more profound,
-> The door of all subtleties!
-@end example
-
-@node Context, Side by Side, Normal, Output Formats
-@section Showing Differences in Their Context
-@cindex context output format
-@cindex @samp{!} output format
-
-Usually, when you are looking at the differences between files, you will
-also want to see the parts of the files near the lines that differ, to
-help you understand exactly what has changed.  These nearby parts of the
-files are called the @dfn{context}.
-
-GNU @code{diff} provides two output formats that show context around the
-differing lines: @dfn{context format} and @dfn{unified format}.  It can
-optionally show in which function or section of the file the differing
-lines are found.
-
-If you are distributing new versions of files to other people in the
-form of @code{diff} output, you should use one of the output formats
-that show context so that they can apply the diffs even if they have
-made small changes of their own to the files.  @code{patch} can apply
-the diffs in this case by searching in the files for the lines of
-context around the differing lines; if those lines are actually a few
-lines away from where the diff says they are, @code{patch} can adjust
-the line numbers accordingly and still apply the diff correctly.
-@xref{Imperfect}, for more information on using @code{patch} to apply
-imperfect diffs.
-
-@menu
-* Context Format::	An output format that shows surrounding lines.
-* Unified Format::	A more compact output format that shows context.
-* Sections::		Showing which sections of the files differences are in.
-* Alternate Names::	Showing alternate file names in context headers.
-@end menu
-
-@node Context Format, Unified Format, , Context
-@subsection Context Format
-
-The context output format shows several lines of context around the
-lines that differ.  It is the standard format for distributing updates
-to source code.
-
-To select this output format, use the @samp{-C @var{lines}},
-@samp{--context@r{[}=@var{lines}@r{]}}, or @samp{-c} option.  The
-argument @var{lines} that some of these options take is the number of
-lines of context to show.  If you do not specify @var{lines}, it
-defaults to three.  For proper operation, @code{patch} typically needs
-at least two lines of context.
-
-@menu
-* Detailed Context::	A detailed description of the context output format.
-* Example Context::	Sample output in context format.
-* Less Context::	Another sample with less context.
-@end menu
-
-@node Detailed Context, Example Context, , Context Format
-@subsubsection Detailed Description of Context Format
-
-The context output format starts with a two-line header, which looks
-like this:
-
-@example
-*** @var{from-file} @var{from-file-modification-time}
---- @var{to-file} @var{to-file-modification time}
-@end example
-
-@noindent
-You can change the header's content with the @samp{-L @var{label}} or
-@samp{--label=@var{label}} option; see @ref{Alternate Names}.
-
-Next come one or more hunks of differences; each hunk shows one area
-where the files differ.  Context format hunks look like this:
-
-@example
-***************
-*** @var{from-file-line-range} ****
-  @var{from-file-line}
-  @var{from-file-line}@dots{}
---- @var{to-file-line-range} ----
-  @var{to-file-line}
-  @var{to-file-line}@dots{}
-@end example
-
-The lines of context around the lines that differ start with two space
-characters.  The lines that differ between the two files start with one
-of the following indicator characters, followed by a space character:
-
-@table @samp
-@item !
-A line that is part of a group of one or more lines that changed between
-the two files.  There is a corresponding group of lines marked with
-@samp{!} in the part of this hunk for the other file.
-
-@item +
-An ``inserted'' line in the second file that corresponds to nothing in
-the first file.
-
-@item -
-A ``deleted'' line in the first file that corresponds to nothing in the
-second file.
-@end table
-
-If all of the changes in a hunk are insertions, the lines of
-@var{from-file} are omitted.  If all of the changes are deletions, the
-lines of @var{to-file} are omitted.
-
-@node Example Context, Less Context, Detailed Context, Context Format
-@subsubsection An Example of Context Format
-
-Here is the output of @samp{diff -c lao tzu} (@pxref{Sample diff Input},
-for the complete contents of the two files).  Notice that up to three
-lines that are not different are shown around each line that is
-different; they are the context lines.  Also notice that the first two
-hunks have run together, because their contents overlap.
-
-@example
-*** lao	Sat Jan 26 23:30:39 1991
---- tzu	Sat Jan 26 23:30:50 1991
-***************
-*** 1,7 ****
-- The Way that can be told of is not the eternal Way;
-- The name that can be named is not the eternal name.
-  The Nameless is the origin of Heaven and Earth;
-! The Named is the mother of all things.
-  Therefore let there always be non-being,
-    so we may see their subtlety,
-  And let there always be being,
---- 1,6 ----
-  The Nameless is the origin of Heaven and Earth;
-! The named is the mother of all things.
-! 
-  Therefore let there always be non-being,
-    so we may see their subtlety,
-  And let there always be being,
-***************
-*** 9,11 ****
---- 8,13 ----
-  The two are the same,
-  But after they are produced,
-    they have different names.
-+ They both may be called deep and profound.
-+ Deeper and more profound,
-+ The door of all subtleties!
-@end example
-
-@node Less Context, , Example Context, Context Format
-@subsubsection An Example of Context Format with Less Context
-
-Here is the output of @samp{diff --context=1 lao tzu} (@pxref{Sample
-diff Input}, for the complete contents of the two files).  Notice that
-at most one context line is reported here.
-
-@example
-*** lao	Sat Jan 26 23:30:39 1991
---- tzu	Sat Jan 26 23:30:50 1991
-***************
-*** 1,5 ****
-- The Way that can be told of is not the eternal Way;
-- The name that can be named is not the eternal name.
-  The Nameless is the origin of Heaven and Earth;
-! The Named is the mother of all things.
-  Therefore let there always be non-being,
---- 1,4 ----
-  The Nameless is the origin of Heaven and Earth;
-! The named is the mother of all things.
-! 
-  Therefore let there always be non-being,
-***************
-*** 11 ****
---- 10,13 ----
-    they have different names.
-+ They both may be called deep and profound.
-+ Deeper and more profound,
-+ The door of all subtleties!
-@end example
-
-@node Unified Format, Sections, Context Format, Context
-@subsection Unified Format
-@cindex unified output format
-@cindex @samp{+-} output format
-
-The unified output format is a variation on the context format that is
-more compact because it omits redundant context lines.  To select this
-output format, use the @samp{-U @var{lines}},
-@samp{--unified@r{[}=@var{lines}@r{]}}, or @samp{-u}
-option.  The argument @var{lines} is the number of lines of context to
-show.  When it is not given, it defaults to three.
-
-At present, only GNU @code{diff} can produce this format and only GNU
-@code{patch} can automatically apply diffs in this format.  For proper
-operation, @code{patch} typically needs at least two lines of context.
-
-@menu
-* Detailed Unified::	A detailed description of unified format.
-* Example Unified::	Sample output in unified format.
-@end menu
-
-@node Detailed Unified, Example Unified, , Unified Format
-@subsubsection Detailed Description of Unified Format
-
-The unified output format starts with a two-line header, which looks
-like this:
-
-@example
---- @var{from-file} @var{from-file-modification-time}
-+++ @var{to-file} @var{to-file-modification-time}
-@end example
-
-@noindent
-You can change the header's content with the @samp{-L @var{label}} or
-@samp{--label=@var{label}} option; see @xref{Alternate Names}.
-
-Next come one or more hunks of differences; each hunk shows one area
-where the files differ.  Unified format hunks look like this:
-
-@example
-@@@@ @var{from-file-range} @var{to-file-range} @@@@
- @var{line-from-either-file}
- @var{line-from-either-file}@dots{}
-@end example
-
-The lines common to both files begin with a space character.  The lines
-that actually differ between the two files have one of the following
-indicator characters in the left column:
-
-@table @samp
-@item +
-A line was added here to the first file.
-
-@item -
-A line was removed here from the first file.
-@end table
-
-@node Example Unified, , Detailed Unified, Unified Format
-@subsubsection An Example of Unified Format
-
-Here is the output of the command @samp{diff -u lao tzu}
-(@pxref{Sample diff Input}, for the complete contents of the two files):
-
-@example
---- lao	Sat Jan 26 23:30:39 1991
-+++ tzu	Sat Jan 26 23:30:50 1991
-@@@@ -1,7 +1,6 @@@@
--The Way that can be told of is not the eternal Way;
--The name that can be named is not the eternal name.
- The Nameless is the origin of Heaven and Earth;
--The Named is the mother of all things.
-+The named is the mother of all things.
-+
- Therefore let there always be non-being,
-   so we may see their subtlety,
- And let there always be being,
-@@@@ -9,3 +8,6 @@@@
- The two are the same,
- But after they are produced,
-   they have different names.
-+They both may be called deep and profound.
-+Deeper and more profound,
-+The door of all subtleties!
-@end example
-
-@node Sections, Alternate Names, Unified Format, Context
-@subsection Showing Which Sections Differences Are in
-@cindex headings
-@cindex section headings
-
-Sometimes you might want to know which part of the files each change
-falls in.  If the files are source code, this could mean which function
-was changed.  If the files are documents, it could mean which chapter or
-appendix was changed.  GNU @code{diff} can show this by displaying the
-nearest section heading line that precedes the differing lines.  Which
-lines are ``section headings'' is determined by a regular expression.
-
-@menu
-* Specified Headings::	Showing headings that match regular expressions.
-* C Function Headings::	Showing headings of C functions.
-@end menu
-
-@node Specified Headings, C Function Headings, , Sections
-@subsubsection Showing Lines That Match Regular Expressions
-@cindex specified headings
-@cindex regular expression matching headings
-
-To show in which sections differences occur for files that are not
-source code for C or similar languages, use the @samp{-F @var{regexp}}
-or @samp{--show-function-line=@var{regexp}} option.  @code{diff}
-considers lines that match the argument @var{regexp} to be the beginning
-of a section of the file.  Here are suggested regular expressions for
-some common languages:
-
-@c Please add to this list, e.g. Fortran, Pascal.
-@table @samp
-@item ^[A-Za-z_]
-C, C++, Prolog
-@item ^(
-Lisp
-@item ^@@\(chapter\|appendix\|unnumbered\|chapheading\)
-Texinfo
-@end table
-
-This option does not automatically select an output format; in order to
-use it, you must select the context format (@pxref{Context Format}) or
-unified format (@pxref{Unified Format}).  In other output formats it
-has no effect.
-
-The @samp{-F} and @samp{--show-function-line} options find the nearest
-unchanged line that precedes each hunk of differences and matches the
-given regular expression.  Then they add that line to the end of the
-line of asterisks in the context format, or to the @samp{@@@@} line in
-unified format.  If no matching line exists, they leave the output for
-that hunk unchanged.  If that line is more than 40 characters long, they
-output only the first 40 characters.  You can specify more than one
-regular expression for such lines; @code{diff} tries to match each line
-against each regular expression, starting with the last one given.  This
-means that you can use @samp{-p} and @samp{-F} together, if you wish.
-
-@node C Function Headings, , Specified Headings, Sections
-@subsubsection Showing C Function Headings
-@cindex C function headings
-@cindex function headings, C
-
-To show in which functions differences occur for C and similar
-languages, you can use the @samp{-p} or @samp{--show-c-function} option.
-This option automatically defaults to the context output format
-(@pxref{Context Format}), with the default number of lines of context.
-You can override that number with @samp{-C @var{lines}} elsewhere in the
-command line.  You can override both the format and the number with
-@samp{-U @var{lines}} elsewhere in the command line.
-
-The @samp{-p} and @samp{--show-c-function} options are equivalent to
-@samp{-F'^[_a-zA-Z$]'} if the unified format is specified, otherwise
-@samp{-c -F'^[_a-zA-Z$]'} (@pxref{Specified Headings}).  GNU @code{diff}
-provides them for the sake of convenience.
-
-@node Alternate Names, , Sections, Context
-@subsection Showing Alternate File Names
-@cindex alternate file names
-@cindex file name alternates
-
-If you are comparing two files that have meaningless or uninformative
-names, you might want @code{diff} to show alternate names in the header
-of the context and unified output formats.  To do this, use the @samp{-L
-@var{label}} or @samp{--label=@var{label}} option.  The first time
-you give this option, its argument replaces the name and date of the
-first file in the header; the second time, its argument replaces the
-name and date of the second file.  If you give this option more than
-twice, @code{diff} reports an error.  The @samp{-L} option does not
-affect the file names in the @code{pr} header when the @samp{-l} or
-@samp{--paginate} option is used (@pxref{Pagination}).
-
-Here are the first two lines of the output from @samp{diff -C2
--Loriginal -Lmodified lao tzu}:
-
-@example
-*** original
---- modified
-@end example
-
-@node Side by Side, Scripts, Context, Output Formats
-@section Showing Differences Side by Side
-@cindex side by side
-@cindex two-column output
-@cindex columnar output
-
-@code{diff} can produce a side by side difference listing of two files.
-The files are listed in two columns with a gutter between them.  The
-gutter contains one of the following markers:
-
-@table @asis
-@item white space
-The corresponding lines are in common.  That is, either the lines are
-identical, or the difference is ignored because of one of the
-@samp{--ignore} options (@pxref{White Space}).
-
-@item @samp{|}
-The corresponding lines differ, and they are either both complete
-or both incomplete.
-
-@item @samp{<}
-The files differ and only the first file contains the line.
-
-@item @samp{>}
-The files differ and only the second file contains the line.
-
-@item @samp{(}
-Only the first file contains the line, but the difference is ignored.
-
-@item @samp{)}
-Only the second file contains the line, but the difference is ignored.
-
-@item @samp{\}
-The corresponding lines differ, and only the first line is incomplete.
-
-@item @samp{/}
-The corresponding lines differ, and only the second line is incomplete.
-@end table
-
-Normally, an output line is incomplete if and only if the lines that it
-contains are incomplete; @xref{Incomplete Lines}.  However, when an
-output line represents two differing lines, one might be incomplete
-while the other is not.  In this case, the output line is complete,
-but its the gutter is marked @samp{\} if the first line is incomplete,
-@samp{/} if the second line is.
-
-Side by side format is sometimes easiest to read, but it has limitations.
-It generates much wider output than usual, and truncates lines that are
-too long to fit.  Also, it relies on lining up output more heavily than
-usual, so its output looks particularly bad if you use varying
-width fonts, nonstandard tab stops, or nonprinting characters.
-
-You can use the @code{sdiff} command to interactively merge side by side
-differences.  @xref{Interactive Merging}, for more information on merging files.
-
-@menu
-* Side by Side Format::		Controlling side by side output format.
-* Example Side by Side::	Sample side by side output.
-@end menu
-
-@node Side by Side Format, Example Side by Side, , Side by Side
-@section Controlling Side by Side Format
-@cindex side by side format
-
-The @samp{-y} or @samp{--side-by-side} option selects side by side
-format.  Because side by side output lines contain two input lines, they
-are wider than usual.  They are normally 130 columns, which can fit onto
-a traditional printer line.  You can set the length of output lines with
-the @samp{-W @var{columns}} or @samp{--width=@var{columns}} option.  The
-output line is split into two halves of equal length, separated by a
-small gutter to mark differences; the right half is aligned to a tab
-stop so that tabs line up.  Input lines that are too long to fit in half
-of an output line are truncated for output.
-
-The @samp{--left-column} option prints only the left column of two
-common lines.  The @samp{--suppress-common-lines} option suppresses
-common lines entirely.
-
-@node Example Side by Side, , Side by Side Format, Side by Side
-@subsection An Example of Side by Side Format
-
-Here is the output of the command @samp{diff -y -W 72 lao tzu}
-(@pxref{Sample diff Input}, for the complete contents of the two files).
-
-@example
-The Way that can be told of is n   <
-The name that can be named is no   <
-The Nameless is the origin of He        The Nameless is the origin of He
-The Named is the mother of all t   |    The named is the mother of all t
-                                   >
-Therefore let there always be no        Therefore let there always be no
-  so we may see their subtlety,           so we may see their subtlety,
-And let there always be being,          And let there always be being,
-  so we may see their outcome.            so we may see their outcome.
-The two are the same,                   The two are the same,
-But after they are produced,            But after they are produced,
-  they have different names.              they have different names.
-                                   >    They both may be called deep and
-                                   >    Deeper and more profound,
-                                   >    The door of all subtleties!
-@end example
-
-@node Scripts, If-then-else, Side by Side, Output Formats
-@section Making Edit Scripts
-@cindex script output formats
-
-Several output modes produce command scripts for editing @var{from-file}
-to produce @var{to-file}.
-
-@menu
-* ed Scripts::		Using @code{diff} to produce commands for @code{ed}.
-* Forward ed::		Making forward @code{ed} scripts.
-* RCS::			A special @code{diff} output format used by RCS.
-@end menu
-
-@node ed Scripts, Forward ed, , Scripts
-@subsection @code{ed} Scripts
-@cindex @code{ed} script output format
-
-@code{diff} can produce commands that direct the @code{ed} text editor
-to change the first file into the second file.  Long ago, this was the
-only output mode that was suitable for editing one file into another
-automatically; today, with @code{patch}, it is almost obsolete.  Use the
-@samp{-e} or @samp{--ed} option to select this output format.
-
-Like the normal format (@pxref{Normal}), this output format does not
-show any context; unlike the normal format, it does not include the
-information necessary to apply the diff in reverse (to produce the first
-file if all you have is the second file and the diff).
-
-If the file @file{d} contains the output of @samp{diff -e old new}, then
-the command @samp{(cat d && echo w) | ed - old} edits @file{old} to make
-it a copy of @file{new}.  More generally, if @file{d1}, @file{d2},
-@dots{}, @file{dN} contain the outputs of @samp{diff -e old new1},
-@samp{diff -e new1 new2}, @dots{}, @samp{diff -e newN-1 newN},
-respectively, then the command @samp{(cat d1 d2 @dots{} dN && echo w) |
-ed - old} edits @file{old} to make it a copy of @file{newN}.
-
-@menu
-* Detailed ed::		A detailed description of @code{ed} format.
-* Example ed::		A sample @code{ed} script.
-@end menu
-
-@node Detailed ed, Example ed, , ed Scripts
-@subsubsection Detailed Description of @code{ed} Format
-
-The @code{ed} output format consists of one or more hunks of
-differences.  The changes closest to the ends of the files come first so
-that commands that change the number of lines do not affect how
-@code{ed} interprets line numbers in succeeding commands.  @code{ed}
-format hunks look like this:
-
-@example
-@var{change-command}
-@var{to-file-line}
-@var{to-file-line}@dots{}
-.
-@end example
-
-Because @code{ed} uses a single period on a line to indicate the end of
-input, GNU @code{diff} protects lines of changes that contain a single
-period on a line by writing two periods instead, then writing a
-subsequent @code{ed} command to change the two periods into one.  The
-@code{ed} format cannot represent an incomplete line, so if the second
-file ends in a changed incomplete line, @code{diff} reports an error and
-then pretends that a newline was appended.
-
-There are three types of change commands.  Each consists of a line
-number or comma-separated range of lines in the first file and a single
-character indicating the kind of change to make.  All line numbers are
-the original line numbers in the file.  The types of change commands
-are:
-
-@table @samp
-@item @var{l}a
-Add text from the second file after line @var{l} in the first file.  For
-example, @samp{8a} means to add the following lines after line 8 of file
-1.
-
-@item @var{r}c
-Replace the lines in range @var{r} in the first file with the following
-lines.  Like a combined add and delete, but more compact.  For example,
-@samp{5,7c} means change lines 5--7 of file 1 to read as the text file
-2.
-
-@item @var{r}d
-Delete the lines in range @var{r} from the first file.  For example,
-@samp{5,7d} means delete lines 5--7 of file 1.
-@end table
-
-@node Example ed, , Detailed ed, ed Scripts
-@subsubsection Example @code{ed} Script
-
-Here is the output of @samp{diff -e lao tzu} (@pxref{Sample
-diff Input}, for the complete contents of the two files):
-
-@example
-11a
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-.
-4c
-The named is the mother of all things.
-
-.
-1,2d
-@end example
-
-@node Forward ed, RCS, ed Scripts, Scripts
-@subsection Forward @code{ed} Scripts
-@cindex forward @code{ed} script output format
-
-@code{diff} can produce output that is like an @code{ed} script, but
-with hunks in forward (front to back) order.  The format of the commands
-is also changed slightly: command characters precede the lines they
-modify, spaces separate line numbers in ranges, and no attempt is made
-to disambiguate hunk lines consisting of a single period.  Like
-@code{ed} format, forward @code{ed} format cannot represent incomplete
-lines.
-
-Forward @code{ed} format is not very useful, because neither @code{ed}
-nor @code{patch} can apply diffs in this format.  It exists mainly for
-compatibility with older versions of @code{diff}.  Use the @samp{-f} or
-@samp{--forward-ed} option to select it.
-
-@node RCS, , Forward ed, Scripts
-@subsection RCS Scripts
-@cindex RCS script output format
-
-The RCS output format is designed specifically for use by the Revision
-Control System, which is a set of free programs used for organizing
-different versions and systems of files.  Use the @samp{-n} or
-@samp{--rcs} option to select this output format.  It is like the
-forward @code{ed} format (@pxref{Forward ed}), but it can represent
-arbitrary changes to the contents of a file because it avoids the
-forward @code{ed} format's problems with lines consisting of a single
-period and with incomplete lines.  Instead of ending text sections with
-a line consisting of a single period, each command specifies the number
-of lines it affects; a combination of the @samp{a} and @samp{d}
-commands are used instead of @samp{c}.  Also, if the second file ends
-in a changed incomplete line, then the output also ends in an
-incomplete line.
-
-Here is the output of @samp{diff -n lao tzu} (@pxref{Sample
-diff Input}, for the complete contents of the two files):
-
-@example
-d1 2
-d4 1
-a4 2
-The named is the mother of all things.
-
-a11 3
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-@end example
-
-@node If-then-else, , Scripts, Output Formats
-@section Merging Files with If-then-else
-@cindex merged output format
-@cindex if-then-else output format
-@cindex C if-then-else output format
-@cindex @code{ifdef} output format
-
-You can use @code{diff} to merge two files of C source code.  The output
-of @code{diff} in this format contains all the lines of both files.
-Lines common to both files are output just once; the differing parts are
-separated by the C preprocessor directives @code{#ifdef @var{name}} or
-@code{#ifndef @var{name}}, @code{#else}, and @code{#endif}.  When
-compiling the output, you select which version to use by either defining
-or leaving undefined the macro @var{name}.
-
-To merge two files, use @code{diff} with the @samp{-D @var{name}} or
-@samp{--ifdef=@var{name}} option.  The argument @var{name} is the C
-preprocessor identifier to use in the @code{#ifdef} and @code{#ifndef}
-directives.
-
-For example, if you change an instance of @code{wait (&s)} to
-@code{waitpid (-1, &s, 0)} and then merge the old and new files with
-the @samp{--ifdef=HAVE_WAITPID} option, then the affected part of your code
-might look like this:
-
-@example
-    do @{
-#ifndef HAVE_WAITPID
-        if ((w = wait (&s)) < 0  &&  errno != EINTR)
-#else /* HAVE_WAITPID */
-        if ((w = waitpid (-1, &s, 0)) < 0  &&  errno != EINTR)
-#endif /* HAVE_WAITPID */
-            return w;
-    @} while (w != child);
-@end example
-
-You can specify formats for languages other than C by using line group
-formats and line formats, as described in the next sections.
-
-@menu
-* Line Group Formats::		Formats for general if-then-else line groups.
-* Line Formats::		Formats for each line in a line group.
-* Detailed If-then-else::	A detailed description of if-then-else format.
-* Example If-then-else::	Sample if-then-else format output.
-@end menu
-
-@node Line Group Formats, Line Formats, , If-then-else
-@subsection Line Group Formats
-@cindex line group formats
-@cindex formats for if-then-else line groups
-
-Line group formats let you specify formats suitable for many
-applications that allow if-then-else input, including programming
-languages and text formatting languages.  A line group format specifies
-the output format for a contiguous group of similar lines.
-
-For example, the following command compares the TeX files @file{old}
-and @file{new}, and outputs a merged file in which old regions are
-surrounded by @samp{\begin@{em@}}-@samp{\end@{em@}} lines, and new
-regions are surrounded by @samp{\begin@{bf@}}-@samp{\end@{bf@}} lines.
-
-@example
-diff \
-   --old-group-format='\begin@{em@}
-%<\end@{em@}
-' \
-   --new-group-format='\begin@{bf@}
-%>\end@{bf@}
-' \
-   old new
-@end example
-
-The following command is equivalent to the above example, but it is a
-little more verbose, because it spells out the default line group formats.
-
-@example
-diff \
-   --old-group-format='\begin@{em@}
-%<\end@{em@}
-' \
-   --new-group-format='\begin@{bf@}
-%>\end@{bf@}
-' \
-   --unchanged-group-format='%=' \
-   --changed-group-format='\begin@{em@}
-%<\end@{em@}
-\begin@{bf@}
-%>\end@{bf@}
-' \
-   old new
-@end example
-
-Here is a more advanced example, which outputs a diff listing with
-headers containing line numbers in a ``plain English'' style.
-
-@example
-diff \
-   --unchanged-group-format='' \
-   --old-group-format='-------- %dn line%(n=1?:s) deleted at %df:
-%<' \
-   --new-group-format='-------- %dN line%(N=1?:s) added after %de:
-%>' \
-   --changed-group-format='-------- %dn line%(n=1?:s) changed at %df:
-%<-------- to:
-%>' \
-   old new
-@end example
-
-To specify a line group format, use @code{diff} with one of the options
-listed below.  You can specify up to four line group formats, one for
-each kind of line group.  You should quote @var{format}, because it
-typically contains shell metacharacters.
-
-@table @samp
-@item --old-group-format=@var{format}
-These line groups are hunks containing only lines from the first file.
-The default old group format is the same as the changed group format if
-it is specified; otherwise it is a format that outputs the line group as-is.
-
-@item --new-group-format=@var{format}
-These line groups are hunks containing only lines from the second
-file.  The default new group format is same as the the changed group
-format if it is specified; otherwise it is a format that outputs the
-line group as-is.
-
-@item --changed-group-format=@var{format}
-These line groups are hunks containing lines from both files.  The
-default changed group format is the concatenation of the old and new
-group formats.
-
-@item --unchanged-group-format=@var{format}
-These line groups contain lines common to both files.  The default
-unchanged group format is a format that outputs the line group as-is.
-@end table
-
-In a line group format, ordinary characters represent themselves;
-conversion specifications start with @samp{%} and have one of the
-following forms.
-
-@table @samp
-@item %<
-stands for the lines from the first file, including the trailing newline.
-Each line is formatted according to the old line format (@pxref{Line Formats}).
-
-@item %>
-stands for the lines from the second file, including the trailing newline.
-Each line is formatted according to the new line format.
-
-@item %=
-stands for the lines common to both files, including the trailing newline.
-Each line is formatted according to the unchanged line format.
-
-@item %%
-stands for @samp{%}.
-
-@item %c'@var{C}'
-where @var{C} is a single character, stands for @var{C}.
-@var{C} may not be a backslash or an apostrophe.
-For example, @samp{%c':'} stands for a colon, even inside
-the then-part of an if-then-else format, which a colon would
-normally terminate.
-
-@item %c'\@var{O}'
-where @var{O} is a string of 1, 2, or 3 octal digits,
-stands for the character with octal code @var{O}.
-For example, @samp{%c'\0'} stands for a null character.
-
-@item @var{F}@var{n}
-where @var{F} is a @code{printf} conversion specification and @var{n} is one
-of the following letters, stands for @var{n}'s value formatted with @var{F}.
-
-@table @samp
-@item e
-The line number of the line just before the group in the old file.
-
-@item f
-The line number of the first line in the group in the old file;
-equals @var{e} + 1.
-
-@item l
-The line number of the last line in the group in the old file.
-
-@item m
-The line number of the line just after the group in the old file;
-equals @var{l} + 1.
-
-@item n
-The number of lines in the group in the old file; equals @var{l} - @var{f} + 1.
-
-@item E, F, L, M, N
-Likewise, for lines in the new file.
-
-@end table
-
-The @code{printf} conversion specification can be @samp{%d},
-@samp{%o}, @samp{%x}, or @samp{%X}, specifying decimal, octal,
-lower case hexadecimal, or upper case hexadecimal output
-respectively.  After the @samp{%} the following options can appear in
-sequence: a @samp{-} specifying left-justification; an integer
-specifying the minimum field width; and a period followed by an
-optional integer specifying the minimum number of digits.
-For example, @samp{%5dN} prints the number of new lines in the group
-in a field of width 5 characters, using the @code{printf} format @code{"%5d"}.
-
-@item (@var{A}=@var{B}?@var{T}:@var{E})
-If @var{A} equals @var{B} then @var{T} else @var{E}.
-@var{A} and @var{B} are each either a decimal constant
-or a single letter interpreted as above.
-This format spec is equivalent to @var{T} if
-@var{A}'s value equals @var{B}'s; otherwise it is equivalent to @var{E}.
-
-For example, @samp{%(N=0?no:%dN) line%(N=1?:s)} is equivalent to
-@samp{no lines} if @var{N} (the number of lines in the group in the the
-new file) is 0, to @samp{1 line} if @var{N} is 1, and to @samp{%dN lines}
-otherwise.
-@end table
-
-@node Line Formats, Detailed If-then-else, Line Group Formats, If-then-else
-@subsection Line Formats
-@cindex line formats
-
-Line formats control how each line taken from an input file is
-output as part of a line group in if-then-else format.
-
-For example, the following command outputs text with a one-column
-change indicator to the left of the text.  The first column of output
-is @samp{-} for deleted lines, @samp{|} for added lines, and a space
-for unchanged lines.  The formats contain newline characters where
-newlines are desired on output.
-
-@example
-diff \
-   --old-line-format='-%l
-' \
-   --new-line-format='|%l
-' \
-   --unchanged-line-format=' %l
-' \
-   old new
-@end example
-
-To specify a line format, use one of the following options.  You should
-quote @var{format}, since it often contains shell metacharacters.
-
-@table @samp
-@item --old-line-format=@var{format}
-formats lines just from the first file.
-
-@item --new-line-format=@var{format}
-formats lines just from the second file.
-
-@item --unchanged-line-format=@var{format}
-formats lines common to both files.
-
-@item --line-format=@var{format}
-formats all lines; in effect, it sets all three above options simultaneously.
-@end table
-
-In a line format, ordinary characters represent themselves;
-conversion specifications start with @samp{%} and have one of the
-following forms.
-
-@table @samp
-@item %l
-stands for the the contents of the line, not counting its trailing
-newline (if any).  This format ignores whether the line is incomplete;
-@xref{Incomplete Lines}.
-
-@item %L
-stands for the the contents of the line, including its trailing newline
-(if any).  If a line is incomplete, this format preserves its
-incompleteness.
-
-@item %%
-stands for @samp{%}.
-
-@item %c'@var{C}'
-where @var{C} is a single character, stands for @var{C}.
-@var{C} may not be a backslash or an apostrophe.
-For example, @samp{%c':'} stands for a colon.
-
-@item %c'\@var{O}'
-where @var{O} is a string of 1, 2, or 3 octal digits,
-stands for the character with octal code @var{O}.
-For example, @samp{%c'\0'} stands for a null character.
-
-@item @var{F}n
-where @var{F} is a @code{printf} conversion specification,
-stands for the line number formatted with @var{F}.
-For example, @samp{%.5dn} prints the line number using the
-@code{printf} format @code{"%.5d"}.  @xref{Line Group Formats}, for
-more about printf conversion specifications.
-
-@end table
-
-The default line format is @samp{%l} followed by a newline character.
-
-If the input contains tab characters and it is important that they line
-up on output, you should ensure that @samp{%l} or @samp{%L} in a line
-format is just after a tab stop (e.g.@: by preceding @samp{%l} or
-@samp{%L} with a tab character), or you should use the @samp{-t} or
-@samp{--expand-tabs} option.
-
-Taken together, the line and line group formats let you specify many
-different formats.  For example, the following command uses a format
-similar to @code{diff}'s normal format.  You can tailor this command
-to get fine control over @code{diff}'s output.
-
-@example
-diff \
-   --old-line-format='< %l
-' \
-   --new-line-format='> %l
-' \
-   --old-group-format='%df%(f=l?:,%dl)d%dE
-%<' \
-   --new-group-format='%dea%dF%(F=L?:,%dL)
-%>' \
-   --changed-group-format='%df%(f=l?:,%dl)c%dF%(F=L?:,%dL)
-%<---
-%>' \
-   --unchanged-group-format='' \
-   old new
-@end example
-
-@node Detailed If-then-else, Example If-then-else, Line Formats, If-then-else
-@subsection Detailed Description of If-then-else Format
-
-For lines common to both files, @code{diff} uses the unchanged line
-group format.  For each hunk of differences in the merged output
-format, if the hunk contains only lines from the first file,
-@code{diff} uses the old line group format; if the hunk contains only
-lines from the second file, @code{diff} uses the new group format;
-otherwise, @code{diff} uses the changed group format.
-
-The old, new, and unchanged line formats specify the output format of
-lines from the first file, lines from the second file, and lines common
-to both files, respectively.
-
-The option @samp{--ifdef=@var{name}} is equivalent to
-the following sequence of options using shell syntax:
-
-@example
---old-group-format='#ifndef @var{name}
-%<#endif /* not @var{name} */
-' \
---new-group-format='#ifdef @var{name}
-%>#endif /* @var{name} */
-' \
---unchanged-group-format='%=' \
---changed-group-format='#ifndef @var{name}
-%<#else /* @var{name} */
-%>#endif /* @var{name} */
-'
-@end example
-
-You should carefully check the @code{diff} output for proper nesting.
-For example, when using the the @samp{-D @var{name}} or
-@samp{--ifdef=@var{name}} option, you should check that if the
-differing lines contain any of the C preprocessor directives
-@samp{#ifdef}, @samp{#ifndef}, @samp{#else}, @samp{#elif}, or
-@samp{#endif}, they are nested properly and match.  If they don't, you
-must make corrections manually.  It is a good idea to carefully check
-the resulting code anyway to make sure that it really does what you
-want it to; depending on how the input files were produced, the output
-might contain duplicate or otherwise incorrect code.
-
-The @code{patch} @samp{-D @var{name}} option behaves just like
-the @code{diff} @samp{-D @var{name}} option, except it operates on
-a file and a diff to produce a merged file; @xref{patch Options}.
-
-@node Example If-then-else, , Detailed If-then-else, If-then-else
-@subsection An Example of If-then-else Format
-
-Here is the output of @samp{diff -DTWO lao tzu} (@pxref{Sample
-diff Input}, for the complete contents of the two files):
-
-@example
-#ifndef TWO
-The Way that can be told of is not the eternal Way;
-The name that can be named is not the eternal name.
-#endif /* not TWO */
-The Nameless is the origin of Heaven and Earth;
-#ifndef TWO
-The Named is the mother of all things.
-#else /* TWO */
-The named is the mother of all things.
-
-#endif /* TWO */
-Therefore let there always be non-being,
-  so we may see their subtlety,
-And let there always be being,
-  so we may see their outcome.
-The two are the same,
-But after they are produced,
-  they have different names.
-#ifdef TWO
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-#endif /* TWO */
-@end example
-
-@node Comparing Directories, Adjusting Output, Output Formats, Top
-@chapter Comparing Directories
-
-You can use @code{diff} to compare some or all of the files in two
-directory trees.  When both file name arguments to @code{diff} are
-directories, it compares each file that is contained in both
-directories, examining file names in alphabetical order.  Normally
-@code{diff} is silent about pairs of files that contain no differences,
-but if you use the @samp{-s} or @samp{--report-identical-files} option,
-it reports pairs of identical files.  Normally @code{diff} reports
-subdirectories common to both directories without comparing
-subdirectories' files, but if you use the @samp{-r} or
-@samp{--recursive} option, it compares every corresponding pair of files
-in the directory trees, as many levels deep as they go.
-
-For file names that are in only one of the directories, @code{diff}
-normally does not show the contents of the file that exists; it reports
-only that the file exists in that directory and not in the other.  You
-can make @code{diff} act as though the file existed but was empty in the
-other directory, so that it outputs the entire contents of the file that
-actually exists.  (It is output as either an insertion or a
-deletion, depending on whether it is in the first or the second
-directory given.)  To do this, use the @samp{-N} or @samp{--new-file}
-option.
-
-If the older directory contains one or more large files that are not in
-the newer directory, you can make the patch smaller by using the
-@samp{-P} or @samp{--unidirectional-new-file} option instead of @samp{-N}.
-This option is like @samp{-N} except that it only inserts the contents
-of files that appear in the second directory but not the first (that is,
-files that were added).  At the top of the patch, write instructions for
-the user applying the patch to remove the files that were deleted before
-applying the patch.  @xref{Making Patches}, for more discussion of
-making patches for distribution.
-
-To ignore some files while comparing directories, use the @samp{-x
-@var{pattern}} or @samp{--exclude=@var{pattern}} option.  This option
-ignores any files or subdirectories whose base names match the shell
-pattern @var{pattern}.  Unlike in the shell, a period at the start of
-the base of a file name matches a wildcard at the start of a pattern.
-You should enclose @var{pattern} in quotes so that the shell does not
-expand it.  For example, the option @samp{-x '*.[ao]'} ignores any file
-whose name ends with @samp{.a} or @samp{.o}.
-
-This option accumulates if you specify it more than once.  For example,
-using the options @samp{-x 'RCS' -x '*,v'} ignores any file or
-subdirectory whose base name is @samp{RCS} or ends with @samp{,v}.
-
-If you need to give this option many times, you can instead put the
-patterns in a file, one pattern per line, and use the @samp{-X
-@var{file}} or @samp{--exclude-from=@var{file}} option.
-
-If you have been comparing two directories and stopped partway through,
-later you might want to continue where you left off.  You can do this by
-using the @samp{-S @var{file}} or @samp{--starting-file=@var{file}}
-option.  This compares only the file @var{file} and all alphabetically
-later files in the topmost directory level.
-
-@node Adjusting Output, diff Performance, Comparing Directories, Top
-@chapter Making @code{diff} Output Prettier
-
-@code{diff} provides several ways to adjust the appearance of its output.
-These adjustments can be applied to any output format.
-
-@menu
-* Tabs::		Preserving the alignment of tabstops.
-* Pagination::		Page numbering and timestamping @code{diff} output.
-@end menu
-
-@node Tabs, Pagination, , Adjusting Output
-@section Preserving Tabstop Alignment
-@cindex tabstop alignment
-@cindex aligning tabstops
-
-The lines of text in some of the @code{diff} output formats are preceded
-by one or two characters that indicate whether the text is inserted,
-deleted, or changed.  The addition of those characters can cause tabs to
-move to the next tabstop, throwing off the alignment of columns in the
-line.  GNU @code{diff} provides two ways to make tab-aligned columns
-line up correctly.
-
-The first way is to have @code{diff} convert all tabs into the correct
-number of spaces before outputting them; select this method with the
-@samp{-t} or @samp{--expand-tabs} option.  @code{diff} assumes that
-tabstops are set every 8 columns.  To use this form of output with
-@code{patch}, you must give @code{patch} the @samp{-l} or
-@samp{--ignore-white-space} option (@pxref{Changed White Space}, for more
-information).
-
-The other method for making tabs line up correctly is to add a tab
-character instead of a space after the indicator character at the
-beginning of the line.  This ensures that all following tab characters
-are in the same position relative to tabstops that they were in the
-original files, so that the output is aligned correctly.  Its
-disadvantage is that it can make long lines too long to fit on one line
-of the screen or the paper.  It also does not work with the unified
-output format, which does not have a space character after the change
-type indicator character.  Select this method with the @samp{-T} or
-@samp{--initial-tab} option.
-
-@node Pagination, , Tabs, Adjusting Output
-@section Paginating @code{diff} Output
-@cindex paginating @code{diff} output
-
-It can be convenient to have long output page-numbered and time-stamped.
-The @samp{-l} and @samp{--paginate} options do this by sending the
-@code{diff} output through the @code{pr} program.  Here is what the page
-header might look like for @samp{diff -lc lao tzu}:
-
-@example
-Mar 11 13:37 1991  diff -lc lao tzu Page 1
-@end example
-
-@node diff Performance, Comparing Three Files, Adjusting Output, Top
-@chapter @code{diff} Performance Tradeoffs
-@cindex performance of @code{diff}
-
-GNU @code{diff} runs quite efficiently; however, in some circumstances
-you can cause it to run faster or produce a more compact set of changes.
-There are two ways that you can affect the performance of GNU
-@code{diff} by changing the way it compares files.
-
-Performance has more than one dimension.  These options improve one
-aspect of performance at the cost of another, or they improve
-performance in some cases while hurting it in others.
-
-The way that GNU @code{diff} determines which lines have changed always
-comes up with a near-minimal set of differences.  Usually it is good
-enough for practical purposes.  If the @code{diff} output is large, you
-might want @code{diff} to use a modified algorithm that sometimes
-produces a smaller set of differences.  The @samp{-d} or
-@samp{--minimal} option does this; however, it can also cause
-@code{diff} to run more slowly than usual, so it is not the default
-behavior.
-
-When the files you are comparing are large and have small groups of
-changes scattered throughout them, you can use the @samp{-H} or
-@samp{--speed-large-files} option to make a different modification to
-the algorithm that @code{diff} uses.  If the input files have a constant
-small density of changes, this option speeds up the comparisons without
-changing the output.  If not, @code{diff} might produce a larger set of
-differences; however, the output will still be correct.
-
-Normally @code{diff} discards the prefix and suffix that is common to
-both files before it attempts to find a minimal set of differences.
-This makes @code{diff} run faster, but occasionally it may produce
-non-minimal output.  The @samp{--horizon-lines=@var{lines}} option
-prevents @code{diff} from discarding the last @var{lines} lines of the
-prefix and the first @var{lines} lines of the suffix.  This gives
-@code{diff} further opportunities to find a minimal output.
-
-@node Comparing Three Files, diff3 Merging, diff Performance, Top
-@chapter Comparing Three Files
-@cindex comparing three files
-@cindex format of @code{diff3} output
-
-Use the program @code{diff3} to compare three files and show any
-differences among them.  (@code{diff3} can also merge files; see
-@ref{diff3 Merging}).
-
-The ``normal'' @code{diff3} output format shows each hunk of
-differences without surrounding context.  Hunks are labeled depending
-on whether they are two-way or three-way, and lines are annotated by
-their location in the input files.
-
-@xref{Invoking diff3}, for more information on how to run @code{diff3}.
-
-@menu
-* Sample diff3 Input::		Sample @code{diff3} input for examples.
-* Detailed diff3 Normal::	A detailed description of normal output format.
-* diff3 Hunks::			The format of normal output format.
-* Example diff3 Normal::	Sample output in the normal format.
-@end menu
-
-@node Sample diff3 Input, Detailed diff3 Normal, , Comparing Three Files
-@section A Third Sample Input File
-@cindex @code{diff3} sample input
-@cindex sample input for @code{diff3}
-
-Here is a third sample file that will be used in examples to illustrate
-the output of @code{diff3} and how various options can change it.  The
-first two files are the same that we used for @code{diff} (@pxref{Sample
-diff Input}).  This is the third sample file, called @file{tao}:
-
-@example
-The Way that can be told of is not the eternal Way;
-The name that can be named is not the eternal name.
-The Nameless is the origin of Heaven and Earth;
-The named is the mother of all things.
-
-Therefore let there always be non-being,
-  so we may see their subtlety,
-And let there always be being,
-  so we may see their result.
-The two are the same,
-But after they are produced,
-  they have different names.
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
-@end example
-
-@node Detailed diff3 Normal, diff3 Hunks, Sample diff3 Input, Comparing Three Files
-@section Detailed Description of @code{diff3} Normal Format
-
-Each hunk begins with a line marked @samp{====}.  Three-way hunks have
-plain @samp{====} lines, and two-way hunks have @samp{1}, @samp{2}, or
-@samp{3} appended to specify which of the three input files differ in
-that hunk.  The hunks contain copies of two or three sets of input
-lines each preceded by one or two commands identifying where the lines
-came from.
-
-Normally, two spaces precede each copy of an input line to distinguish
-it from the commands.  But with the @samp{-T} or @samp{--initial-tab}
-option, @code{diff3} uses a tab instead of two spaces; this lines up
-tabs correctly.  @xref{Tabs}, for more information.
-
-Commands take the following forms:
-
-@table @samp
-@item @var{file}:@var{l}a
-This hunk appears after line @var{l} of file @var{file}, and
-contains no lines in that file.  To edit this file to yield the other
-files, one must append hunk lines taken from the other files.  For
-example, @samp{1:11a} means that the hunk follows line 11 in the first
-file and contains no lines from that file.
-
-@item @var{file}:@var{r}c
-This hunk contains the lines in the range @var{r} of file @var{file}.
-The range @var{r} is a comma-separated pair of line numbers, or just one
-number if the range is a singleton.  To edit this file to yield the
-other files, one must change the specified lines to be the lines taken
-from the other files.  For example, @samp{2:11,13c} means that the hunk
-contains lines 11 through 13 from the second file.
-@end table
-
-If the last line in a set of input lines is incomplete
-(@pxref{Incomplete Lines}), it is distinguished on output from a full
-line by a following line that starts with @samp{\}.
-
-@node diff3 Hunks, Example diff3 Normal, Detailed diff3 Normal, Comparing Three Files
-@section @code{diff3} Hunks
-@cindex hunks for @code{diff3}
-@cindex @code{diff3} hunks
-
-Groups of lines that differ in two or three of the input files are
-called @dfn{diff3 hunks}, by analogy with @code{diff} hunks
-(@pxref{Hunks}).  If all three input files differ in a @code{diff3}
-hunk, the hunk is called a @dfn{three-way hunk}; if just two input files
-differ, it is a @dfn{two-way hunk}.
-
-As with @code{diff}, several solutions are possible.  When comparing the
-files @samp{A}, @samp{B}, and @samp{C}, @code{diff3} normally finds
-@code{diff3} hunks by merging the two-way hunks output by the two
-commands @samp{diff A B} and @samp{diff A C}.  This does not necessarily
-minimize the size of the output, but exceptions should be rare.
-
-For example, suppose @file{F} contains the three lines @samp{a},
-@samp{b}, @samp{f}, @file{G} contains the lines @samp{g}, @samp{b},
-@samp{g}, and @file{H} contains the lines @samp{a}, @samp{b},
-@samp{h}.  @samp{diff3 F G H} might output the following:
-
-@example
-====2
-1:1c
-3:1c
-  a
-2:1c
-  g
-====
-1:3c
-  f
-2:3c
-  g
-3:3c
-  h
-@end example
-
-@noindent
-because it found a two-way hunk containing @samp{a} in the first and
-third files and @samp{g} in the second file, then the single line
-@samp{b} common to all three files, then a three-way hunk containing
-the last line of each file.
-
-@node Example diff3 Normal, , diff3 Hunks, Comparing Three Files
-@section An Example of @code{diff3} Normal Format
-
-Here is the output of the command @samp{diff3 lao tzu tao}
-(@pxref{Sample diff3 Input}, for the complete contents of the files).
-Notice that it shows only the lines that are different among the three
-files.
-
-@example
-====2
-1:1,2c
-3:1,2c
-  The Way that can be told of is not the eternal Way;
-  The name that can be named is not the eternal name.
-2:0a
-====1
-1:4c
-  The Named is the mother of all things.
-2:2,3c
-3:4,5c
-  The named is the mother of all things.
-  
-====3
-1:8c
-2:7c
-    so we may see their outcome.
-3:9c
-    so we may see their result.
-====
-1:11a
-2:11,13c
-  They both may be called deep and profound.
-  Deeper and more profound,
-  The door of all subtleties!
-3:13,14c
-  
-    -- The Way of Lao-Tzu, tr. Wing-tsit Chan
-@end example
-
-@node diff3 Merging, Interactive Merging, Comparing Three Files, Top
-@chapter Merging From a Common Ancestor
-@cindex merging from a common ancestor
-
-When two people have made changes to copies of the same file,
-@code{diff3} can produce a merged output that contains both sets of
-changes together with warnings about conflicts.
-
-One might imagine programs with names like @code{diff4} and @code{diff5}
-to compare more than three files simultaneously, but in practice the
-need rarely arises.  You can use @code{diff3} to merge three or more
-sets of changes to a file by merging two change sets at a time.
-
-@code{diff3} can incorporate changes from two modified versions into a
-common preceding version.  This lets you merge the sets of changes
-represented by the two newer files.  Specify the common ancestor version
-as the second argument and the two newer versions as the first and third
-arguments, like this:
-
-@example
-diff3 @var{mine} @var{older} @var{yours}
-@end example
-
-@noindent
-You can remember the order of the arguments by noting that they are in
-alphabetical order.
-
-@cindex conflict
-@cindex overlap
-You can think of this as subtracting @var{older} from @var{yours} and
-adding the result to @var{mine}, or as merging into @var{mine} the
-changes that would turn @var{older} into @var{yours}.  This merging is
-well-defined as long as @var{mine} and @var{older} match in the
-neighborhood of each such change.  This fails to be true when all three
-input files differ or when only @var{older} differs; we call this
-a @dfn{conflict}.  When all three input files differ, we call the
-conflict an @dfn{overlap}.
-
-@code{diff3} gives you several ways to handle overlaps and conflicts.
-You can omit overlaps or conflicts, or select only overlaps,
-or mark conflicts with special @samp{<<<<<<<} and @samp{>>>>>>>} lines.
-
-@code{diff3} can output the merge results as an @code{ed} script that
-that can be applied to the first file to yield the merged output.
-However, it is usually better to have @code{diff3} generate the merged
-output directly; this bypasses some problems with @code{ed}.
-
-@menu
-* Which Changes::		Selecting changes to incorporate.
-* Marking Conflicts::		Marking conflicts.
-* Bypassing ed::		Generating merged output directly.
-* Merging Incomplete Lines::	How @code{diff3} merges incomplete lines.
-* Saving the Changed File::	Emulating System V behavior.
-@end menu
-
-@node Which Changes, Marking Conflicts, , diff3 Merging
-@section Selecting Which Changes to Incorporate
-@cindex overlapping change, selection of
-@cindex unmerged change
-
-You can select all unmerged changes from @var{older} to @var{yours} for merging
-into @var{mine} with the @samp{-e} or @samp{--ed} option.  You can
-select only the nonoverlapping unmerged changes with @samp{-3} or
-@samp{--easy-only}, and you can select only the overlapping changes with
-@samp{-x} or @samp{--overlap-only}.
-
-The @samp{-e}, @samp{-3} and @samp{-x} options select only
-@dfn{unmerged changes}, i.e.@: changes where @var{mine} and @var{yours}
-differ; they ignore changes from @var{older} to @var{yours} where
-@var{mine} and @var{yours} are identical, because they assume that such
-changes have already been merged.  If this assumption is not a safe
-one, you can use the @samp{-A} or @samp{--show-all} option
-(@pxref{Marking Conflicts}).
-
-Here is the output of the command @code{diff3} with each of these three
-options (@pxref{Sample diff3 Input}, for the complete contents of the files).
-Notice that @samp{-e} outputs the union of the disjoint sets of changes
-output by @samp{-3} and @samp{-x}.
-
-Output of @samp{diff3 -e lao tzu tao}:
-@example
-11a
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
-.
-8c
-  so we may see their result.
-.
-@end example
-
-Output of @samp{diff3 -3 lao tzu tao}:
-@example
-8c
-  so we may see their result.
-.
-@end example
-
-Output of @samp{diff3 -x lao tzu tao}:
-@example
-11a
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
-.
-@end example
-
-@node Marking Conflicts, Bypassing ed, Which Changes, diff3 Merging
-@section Marking Conflicts
-@cindex conflict marking
-@cindex @samp{<<<<<<<} for marking conflicts
-
-@code{diff3} can mark conflicts in the merged output by
-bracketing them with special marker lines.  A conflict
-that comes from two files @var{A} and @var{B} is marked as follows:
-
-@example
-<<<<<<< @var{A}
-@r{lines from @var{A}}
-=======
-@r{lines from @var{B}}
->>>>>>> @var{B}
-@end example
-
-A conflict that comes from three files @var{A}, @var{B} and @var{C} is
-marked as follows:
-
-@example
-<<<<<<< @var{A}
-@r{lines from @var{A}}
-||||||| @var{B}
-@r{lines from @var{B}}
-=======
-@r{lines from @var{C}}
->>>>>>> @var{C}
-@end example
-
-The @samp{-A} or @samp{--show-all} option acts like the @samp{-e}
-option, except that it brackets conflicts, and it outputs all changes
-from @var{older} to @var{yours}, not just the unmerged changes.  Thus,
-given the sample input files (@pxref{Sample diff3 Input}), @samp{diff3
--A lao tzu tao} puts brackets around the conflict where only @file{tzu}
-differs:
-
-@example
-<<<<<<< tzu
-=======
-The Way that can be told of is not the eternal Way;
-The name that can be named is not the eternal name.
->>>>>>> tao
-@end example
-
-And it outputs the three-way conflict as follows:
-
-@example
-<<<<<<< lao
-||||||| tzu
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-=======
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
->>>>>>> tao
-@end example
-
-The @samp{-E} or @samp{--show-overlap} option outputs less information
-than the @samp{-A} or @samp{--show-all} option, because it outputs only
-unmerged changes, and it never outputs the contents of the second
-file.  Thus the @samp{-E} option acts like the @samp{-e} option,
-except that it brackets the first and third files from three-way
-overlapping changes.  Similarly, @samp{-X} acts like @samp{-x}, except
-it brackets all its (necessarily overlapping) changes.  For example,
-for the three-way overlapping change above, the @samp{-E} and @samp{-X}
-options output the following:
-
-@example
-<<<<<<< lao
-=======
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
->>>>>>> tao
-@end example
-
-If you are comparing files that have meaningless or uninformative names,
-you can use the @samp{-L @var{label}} or @samp{--label=@var{label}}
-option to show alternate names in the @samp{<<<<<<<}, @samp{|||||||}
-and @samp{>>>>>>>} brackets.  This option can be given up to three
-times, once for each input file.  Thus @samp{diff3 -A -L X -L Y -L Z A
-B C} acts like @samp{diff3 -A A B C}, except that the output looks like
-it came from files named @samp{X}, @samp{Y} and @samp{Z} rather than
-from files named @samp{A}, @samp{B} and @samp{C}.
-
-@node Bypassing ed, Merging Incomplete Lines, Marking Conflicts, diff3 Merging
-@section Generating the Merged Output Directly
-@cindex merged @code{diff3} format
-
-With the @samp{-m} or @samp{--merge} option, @code{diff3} outputs the
-merged file directly.  This is more efficient than using @code{ed} to
-generate it, and works even with non-text files that @code{ed} would
-reject.  If you specify @samp{-m} without an @code{ed} script option,
-@samp{-A} (@samp{--show-all}) is assumed.
-
-For example, the command @samp{diff3 -m lao tzu tao}
-(@pxref{Sample diff3 Input} for a copy of the input files) would output
-the following:
-
-@example
-<<<<<<< tzu
-=======
-The Way that can be told of is not the eternal Way;
-The name that can be named is not the eternal name.
->>>>>>> tao
-The Nameless is the origin of Heaven and Earth;
-The Named is the mother of all things.
-Therefore let there always be non-being,
-  so we may see their subtlety,
-And let there always be being,
-  so we may see their result.
-The two are the same,
-But after they are produced,
-  they have different names.
-<<<<<<< lao
-||||||| tzu
-They both may be called deep and profound.
-Deeper and more profound,
-The door of all subtleties!
-=======
-
-  -- The Way of Lao-Tzu, tr. Wing-tsit Chan
->>>>>>> tao
-@end example
-
-@node Merging Incomplete Lines, Saving the Changed File, Bypassing ed, diff3 Merging
-@section How @code{diff3} Merges Incomplete Lines
-@cindex incomplete line merging
-
-With @samp{-m}, incomplete lines (@pxref{Incomplete Lines}) are simply
-copied to the output as they are found; if the merged output ends in an
-conflict and one of the input files ends in an incomplete
-line, succeeding @samp{|||||||}, @samp{=======} or @samp{>>>>>>>}
-brackets appear somewhere other than the start of a line because
-they are appended to the incomplete line.
-
-Without @samp{-m}, if an @code{ed} script option is specified and an
-incomplete line is found, @code{diff3} generates a warning and acts as
-if a newline had been present.
-
-@node Saving the Changed File, , Merging Incomplete Lines, diff3 Merging
-@section Saving the Changed File
-@cindex System V @code{diff3} compatibility
-
-Traditional Unix @code{diff3} generates an @code{ed} script without the
-trailing @samp{w} and and @samp{q} commands that save the changes.
-System V @code{diff3} generates these extra commands.  GNU @code{diff3}
-normally behaves like traditional Unix @code{diff3}, but with the
-@samp{-i} option it behaves like System V @code{diff3} and appends the
-@samp{w} and @samp{q} commands.
-
-The @samp{-i} option requires one of the @code{ed} script options
-@samp{-AeExX3}, and is incompatible with the merged output option
-@samp{-m}.
-
-@node Interactive Merging, Merging with patch, diff3 Merging, Top
-@chapter Interactive Merging with @code{sdiff}
-@cindex diff merging
-@cindex interactive merging
-
-With @code{sdiff}, you can merge two files interactively based on a
-side-by-side @samp{-y} format comparison (@pxref{Side by Side}).  Use
-@samp{-o @var{file}} or @samp{--output=@var{file}} to specify where to
-put the merged text.  @xref{Invoking sdiff}, for more details on the
-options to @code{sdiff}.
-
-Another way to merge files interactively is to use the Emacs Lisp
-package @code{emerge}.  @xref{emerge, , emerge, emacs, The GNU Emacs
-Manual}, for more information.
-
-@menu
-* sdiff Option Summary::Summary of @code{sdiff} options.
-* Merge Commands::	Merging two files interactively.
-@end menu
-
-@node sdiff Option Summary, Merge Commands, , Interactive Merging
-@section Specifying @code{diff} Options to @code{sdiff}
-@cindex @code{sdiff} output format
-
-The following @code{sdiff} options have the same meaning as for
-@code{diff}.  @xref{diff Options}, for the use of these options.
-
-@example
--a -b -d -i -t -v
--B -H -I @var{regexp}
-
---ignore-blank-lines  --ignore-case
---ignore-matching-lines=@var{regexp}  --ignore-space-change
---left-column  --minimal  --speed-large-files
---suppress-common-lines  --expand-tabs
---text  --version  --width=@var{columns}
-@end example
-
-For historical reasons, @code{sdiff} has alternate names for some
-options.  The @samp{-l} option is equivalent to the @samp{--left-column}
-option, and similarly @samp{-s} is equivalent to
-@samp{--suppress-common-lines}.  The meaning of the @code{sdiff}
-@samp{-w} and @samp{-W} options is interchanged from that of
-@code{diff}: with @code{sdiff}, @samp{-w @var{columns}} is equivalent to
-@samp{--width=@var{columns}}, and @samp{-W} is equivalent to
-@samp{--ignore-all-space}.  @code{sdiff} without the @samp{-o} option is
-equivalent to @code{diff} with the @samp{-y} or @samp{--side-by-side}
-option (@pxref{Side by Side}).
-
-@node Merge Commands, , sdiff Option Summary, Interactive Merging
-@section Merge Commands
-@cindex merge commands
-@cindex merging interactively
-
-Groups of common lines, with a blank gutter, are copied from the first
-file to the output.  After each group of differing lines, @code{sdiff}
-prompts with @samp{%} and pauses, waiting for one of the following
-commands.  Follow each command with @key{RET}.
-
-@table @samp
-@item e
-Discard both versions.
-Invoke a text editor on an empty temporary file,
-then copy the resulting file to the output.
-
-@item eb
-Concatenate the two versions, edit the result in a temporary file,
-then copy the edited result to the output.
-
-@item el
-Edit a copy of the left version, then copy the result to the output.
-
-@item er
-Edit a copy of the right version, then copy the result to the output.
-
-@item l
-Copy the left version to the output.
-
-@item q
-Quit.
-
-@item r
-Copy the right version to the output.
-
-@item s
-Silently copy common lines.
-
-@item v
-Verbosely copy common lines.  This is the default.
-@end table
-
-The text editor invoked is specified by the @code{EDITOR} environment
-variable if it is set.  The default is system-dependent.
-
-@node Merging with patch, Making Patches, Interactive Merging, Top
-@chapter Merging with @code{patch}
-
-@code{patch} takes comparison output produced by @code{diff} and applies
-the differences to a copy of the original file, producing a patched
-version.  With @code{patch}, you can distribute just the changes to a
-set of files instead of distributing the entire file set; your
-correspondents can apply @code{patch} to update their copy of the files
-with your changes.  @code{patch} automatically determines the diff
-format, skips any leading or trailing headers, and uses the headers to
-determine which file to patch.  This lets your correspondents feed an
-article or message containing a difference listing directly to
-@code{patch}.
-
-@code{patch} detects and warns about common problems like forward
-patches.  It saves the original version of the files it patches, and
-saves any patches that it could not apply.  It can also maintain a
-@code{patchlevel.h} file to ensures that your correspondents apply
-diffs in the proper order.
-
-@code{patch} accepts a series of diffs in its standard input, usually
-separated by headers that specify which file to patch.  It applies
-@code{diff} hunks (@pxref{Hunks}) one by one.  If a hunk does not
-exactly match the original file, @code{patch} uses heuristics to try to
-patch the file as well as it can.  If no approximate match can be found,
-@code{patch} rejects the hunk and skips to the next hunk.  @code{patch}
-normally replaces each file @var{f} with its new version, saving the
-original file in @samp{@var{f}.orig}, and putting reject hunks (if any)
-into @samp{@var{f}.rej}.
-
-@xref{Invoking patch}, for detailed information on the options to
-@code{patch}.  @xref{Backups}, for more information on how
-@code{patch} names backup files.  @xref{Rejects}, for more information
-on where @code{patch} puts reject hunks.
-
-@menu
-* patch Input::		Selecting the type of @code{patch} input.
-* Imperfect::		Dealing with imperfect patches.
-* Empty Files::		Removing empty files after patching.
-* Multiple Patches::	Handling multiple patches in a file specially.
-* patch Messages::	Messages and questions @code{patch} can produce.
-@end menu
-
-@node patch Input, Imperfect, , Merging with patch
-@section Selecting the @code{patch} Input Format
-@cindex @code{patch} input format
-
-@code{patch} normally determines which @code{diff} format the patch
-file uses by examining its contents.  For patch files that contain
-particularly confusing leading text, you might need to use one of the
-following options to force @code{patch} to interpret the patch file as a
-certain format of diff.  The output formats listed here are the only
-ones that @code{patch} can understand.
-
-@table @samp
-@item -c
-@itemx --context
-context diff.
-
-@item -e
-@itemx --ed
-@code{ed} script.
-
-@item -n
-@itemx --normal
-normal diff.
-
-@item -u
-@itemx --unified
-unified diff.
-@end table
-
-@node Imperfect, Empty Files, patch Input, Merging with patch
-@section Applying Imperfect Patches
-@cindex imperfect patch application
-
-@code{patch} tries to skip any leading text in the patch file, apply the
-diff, and then skip any trailing text.  Thus you can feed a news article
-or mail message directly to @code{patch}, and it should work.  If the
-entire diff is indented by a constant amount of white space, @code{patch}
-automatically ignores the indentation.
-
-However, certain other types of imperfect input require user
-intervention.
-
-@menu
-* Changed White Space::	When tabs and spaces don't match exactly.
-* Reversed Patches::	Applying reversed patches correctly.
-* Inexact::		Helping @code{patch} find close matches.
-@end menu
-
-@node Changed White Space, Reversed Patches, , Imperfect
-@subsection Applying Patches with Changed White Space
-@cindex white space in patches
-
-Sometimes mailers, editors, or other programs change spaces into tabs,
-or vice versa.  If this happens to a patch file or an input file, the
-files might look the same, but @code{patch} will not be able to match
-them properly.  If this problem occurs, use the @samp{-l} or
-@samp{--ignore-white-space} option, which makes @code{patch} compare
-white space loosely so that any sequence of white space in the patch file
-matches any sequence of white space in the input files.  Non-white-space
-characters must still match exactly.  Each line of the context must
-still match a line in the input file.
-
-@node Reversed Patches, Inexact, Changed White Space, Imperfect
-@subsection Applying Reversed Patches
-@cindex reversed patches
-
-Sometimes people run @code{diff} with the new file first instead of
-second.  This creates a diff that is ``reversed''.  To apply such
-patches, give @code{patch} the @samp{-R} or @samp{--reverse} option.
-@code{patch} then attempts to swap each hunk around before applying it.
-Rejects come out in the swapped format.  The @samp{-R} option does not
-work with @code{ed} scripts because there is too little information in
-them to reconstruct the reverse operation.
-
-Often @code{patch} can guess that the patch is reversed.  If the first
-hunk of a patch fails, @code{patch} reverses the hunk to see if it can
-apply it that way.  If it can, @code{patch} asks you if you want to have
-the @samp{-R} option set; if it can't, @code{patch} continues to apply
-the patch normally.  This method cannot detect a reversed patch if it is
-a normal diff and the first command is an append (which should have been
-a delete) since appends always succeed, because a null context matches
-anywhere.  But most patches add or change lines rather than delete them,
-so most reversed normal diffs begin with a delete, which fails, and
-@code{patch} notices.
-
-If you apply a patch that you have already applied, @code{patch} thinks
-it is a reversed patch and offers to un-apply the patch.  This could be
-construed as a feature.  If you did this inadvertently and you don't
-want to un-apply the patch, just answer @samp{n} to this offer and to
-the subsequent ``apply anyway'' question---or type @kbd{C-c} to kill the
-@code{patch} process.
-
-@node Inexact, , Reversed Patches, Imperfect
-@subsection Helping @code{patch} Find Inexact Matches
-@cindex inexact patches
-@cindex fuzz factor when patching
-
-For context diffs, and to a lesser extent normal diffs, @code{patch} can
-detect when the line numbers mentioned in the patch are incorrect, and
-it attempts to find the correct place to apply each hunk of the patch.
-As a first guess, it takes the line number mentioned in the hunk, plus
-or minus any offset used in applying the previous hunk.  If that is not
-the correct place, @code{patch} scans both forward and backward for a
-set of lines matching the context given in the hunk.
-
-First @code{patch} looks for a place where all lines of the context
-match.  If it cannot find such a place, and it is reading a context or
-unified diff, and the maximum fuzz factor is set to 1 or more, then
-@code{patch} makes another scan, ignoring the first and last line of
-context.  If that fails, and the maximum fuzz factor is set to 2 or
-more, it makes another scan, ignoring the first two and last two lines
-of context are ignored.  It continues similarly if the maximum fuzz
-factor is larger.
-
-The @samp{-F @var{lines}} or @samp{--fuzz=@var{lines}} option sets the
-maximum fuzz factor to @var{lines}.  This option only applies to context
-and unified diffs; it ignores up to @var{lines} lines while looking for
-the place to install a hunk.  Note that a larger fuzz factor increases
-the odds of making a faulty patch.  The default fuzz factor is 2; it may
-not be set to more than the number of lines of context in the diff,
-ordinarily 3.
-
-If @code{patch} cannot find a place to install a hunk of the patch, it
-writes the hunk out to a reject file (@pxref{Rejects}, for information
-on how reject files are named).  It writes out rejected hunks in context
-format no matter what form the input patch is in.  If the input is a
-normal or @code{ed} diff, many of the contexts are simply null.  The
-line numbers on the hunks in the reject file may be different from those
-in the patch file: they show the approximate location where @code{patch}
-thinks the failed hunks belong in the new file rather than in the old
-one.
-
-As it completes each hunk, @code{patch} tells you whether the hunk
-succeeded or failed, and if it failed, on which line (in the new file)
-@code{patch} thinks the hunk should go.  If this is different from the
-line number specified in the diff, it tells you the offset.  A single
-large offset @emph{may} indicate that @code{patch} installed a hunk in
-the wrong place.  @code{patch} also tells you if it used a fuzz factor
-to make the match, in which case you should also be slightly suspicious.
-
-@code{patch} cannot tell if the line numbers are off in an @code{ed}
-script, and can only detect wrong line numbers in a normal diff when it
-finds a change or delete command.  It may have the same problem with a
-context diff using a fuzz factor equal to or greater than the number of
-lines of context shown in the diff (typically 3).  In these cases, you
-should probably look at a context diff between your original and patched
-input files to see if the changes make sense.  Compiling without errors
-is a pretty good indication that the patch worked, but not a guarantee.
-
-@code{patch} usually produces the correct results, even when it must
-make many guesses.  However, the results are guaranteed only when
-the patch is applied to an exact copy of the file that the patch was
-generated from.
-
-@node Empty Files, Multiple Patches, Imperfect, Merging with patch
-@section Removing Empty Files
-@cindex empty files, removing
-@cindex removing empty files
-
-Sometimes when comparing two directories, the first directory contains a
-file that the second directory does not.  If you give @code{diff} the
-@samp{-N} or @samp{--new-file} option, it outputs a diff that deletes
-the contents of this file.  By default, @code{patch} leaves an empty
-file after applying such a diff.  The @samp{-E} or
-@samp{--remove-empty-files} option to @code{patch} deletes output files
-that are empty after applying the diff.
-
-@node Multiple Patches, patch Messages, Empty Files, Merging with patch
-@section Multiple Patches in a File
-@cindex multiple patches
-
-If the patch file contains more than one patch, @code{patch} tries to
-apply each of them as if they came from separate patch files.  This
-means that it determines the name of the file to patch for each patch,
-and that it examines the leading text before each patch for file names
-and prerequisite revision level (@pxref{Making Patches}, for more on
-that topic).
-
-For the second and subsequent patches in the patch file, you can give
-options and another original file name by separating their argument
-lists with a @samp{+}.  However, the argument list for a second or
-subsequent patch may not specify a new patch file, since that does not
-make sense.
-
-For example, to tell @code{patch} to strip the first three slashes from
-the name of the first patch in the patch file and none from subsequent
-patches, and to use @file{code.c} as the first input file, you can use:
-
-@example
-patch -p3 code.c + -p0 < patchfile
-@end example
-
-The @samp{-S} or @samp{--skip} option ignores the current patch from the
-patch file, but continue looking for the next patch in the file.  Thus,
-to ignore the first and third patches in the patch file, you can use:
-
-@example
-patch -S + + -S + < patch file
-@end example
-
-@node patch Messages, , Multiple Patches, Merging with patch
-@section Messages and Questions from @code{patch}
-@cindex @code{patch} messages and questions
-@cindex diagnostics from @code{patch}
-@cindex messages from @code{patch}
-
-@code{patch} can produce a variety of messages, especially if it has
-trouble decoding its input.  In a few situations where it's not sure how
-to proceed, @code{patch} normally prompts you for more information from
-the keyboard.  There are options to suppress printing non-fatal messages
-and stopping for keyboard input.
-
-The message @samp{Hmm...} indicates that @code{patch} is reading text in
-the patch file, attempting to determine whether there is a patch in that
-text, and if so, what kind of patch it is.
-
-You can inhibit all terminal output from @code{patch}, unless an error
-occurs, by using the @samp{-s}, @samp{--quiet}, or @samp{--silent}
-option.
-
-There are two ways you can prevent @code{patch} from asking you any
-questions.  The @samp{-f} or @samp{--force} option assumes that you know
-what you are doing.  It assumes the following:
-
-@itemize @bullet
-@item
-skip patches that do not contain file names in their headers;
-
-@item
-patch files even though they have the wrong version for the
-@samp{Prereq:} line in the patch;
-
-@item
-assume that patches are not reversed even if they look like they are.
-@end itemize
-
-The @samp{-t} or @samp{--batch} option is similar to @samp{-f}, in that
-it suppresses questions, but it makes somewhat different assumptions:
-
-@itemize @bullet
-@item
-skip patches that do not contain file names in their headers
-(the same as @samp{-f});
-
-@item
-skip patches for which the file has the wrong version for the
-@samp{Prereq:} line in the patch;
-
-@item
-assume that patches are reversed if they look like they are.
-@end itemize
-
-@code{patch} exits with a non-zero status if it creates any reject
-files.  When applying a set of patches in a loop, you should check the
-exit status, so you don't apply a later patch to a partially patched
-file.
-
-@node Making Patches, Invoking cmp, Merging with patch, Top
-@chapter Tips for Making Patch Distributions
-@cindex patch making tips
-@cindex tips for patch making
-
-Here are some things you should keep in mind if you are going to
-distribute patches for updating a software package.
-
-Make sure you have specified the file names correctly, either in a
-context diff header or with an @samp{Index:} line.  If you are patching
-files in a subdirectory, be sure to tell the patch user to specify a
-@samp{-p} or @samp{--strip} option as needed.  Take care to not send out
-reversed patches, since these make people wonder whether they have
-already applied the patch.
-
-To save people from partially applying a patch before other patches that
-should have gone before it, you can make the first patch in the patch
-file update a file with a name like @file{patchlevel.h} or
-@file{version.c}, which contains a patch level or version number.  If
-the input file contains the wrong version number, @code{patch} will
-complain immediately.
-
-An even clearer way to prevent this problem is to put a @samp{Prereq:}
-line before the patch.  If the leading text in the patch file contains a
-line that starts with @samp{Prereq:}, @code{patch} takes the next word
-from that line (normally a version number) and checks whether the next
-input file contains that word, preceded and followed by either
-white space or a newline.  If not, @code{patch} prompts you for
-confirmation before proceeding.  This makes it difficult to accidentally
-apply patches in the wrong order.
-
-Since @code{patch} does not handle incomplete lines properly, make sure
-that all the source files in your program end with a newline whenever
-you release a version.
-
-To create a patch that changes an older version of a package into a
-newer version, first make a copy of the older version in a scratch
-directory.  Typically you do that by unpacking a @code{tar} or
-@code{shar} archive of the older version.
-
-You might be able to reduce the size of the patch by renaming or
-removing some files before making the patch.  If the older version of
-the package contains any files that the newer version does not, or if
-any files have been renamed between the two versions, make a list of
-@code{rm} and @code{mv} commands for the user to execute in the old
-version directory before applying the patch.  Then run those commands
-yourself in the scratch directory.
-
-If there are any files that you don't need to include in the patch
-because they can easily be rebuilt from other files (for example,
-@file{TAGS} and output from @code{yacc} and @code{makeinfo}), replace
-the versions in the scratch directory with the newer versions, using
-@code{rm} and @code{ln} or @code{cp}.
-
-Now you can create the patch.  The de-facto standard @code{diff} format
-for patch distributions is context format with two lines of context,
-produced by giving @code{diff} the @samp{-C 2} option.  Do not use less
-than two lines of context, because @code{patch} typically needs at
-least two lines for proper operation.  Give @code{diff} the @samp{-P}
-option in case the newer version of the package contains any files that
-the older one does not.  Make sure to specify the scratch directory
-first and the newer directory second.
-
-Add to the top of the patch a note telling the user any @code{rm} and
-@code{mv} commands to run before applying the patch.  Then you can
-remove the scratch directory.
-
-@node Invoking cmp, Invoking diff, Making Patches, Top
-@chapter Invoking @code{cmp}
-@cindex invoking @code{cmp}
-@cindex @code{cmp} invocation
-
-The @code{cmp} command compares two files, and if they differ, tells the
-first byte and line number where they differ.  Its arguments are as
-follows:
-
-@example
-cmp @var{options}@dots{} @var{from-file} @r{[}@var{to-file}@var{]}
-@end example
-
-The file name @samp{-} is always the standard input.  @code{cmp} also
-uses the standard input if one file name is omitted.
-
-An exit status of 0 means no differences were found, 1 means some
-differences were found, and 2 means trouble.
-
-@menu
-* cmp Options::		Summary of options to @code{cmp}.
-@end menu
-
-@node cmp Options, , , Invoking cmp
-@section Options to @code{cmp}
-@cindex @code{cmp} options
-@cindex options for @code{cmp}
-
-Below is a summary of all of the options that GNU @code{cmp} accepts.
-Most options have two equivalent names, one of which is a single letter
-preceded by @samp{-}, and the other of which is a long name preceded by
-@samp{--}.  Multiple single letter options (unless they take an
-argument) can be combined into a single command line word: @samp{-cl} is
-equivalent to @samp{-c -l}.
-
-@table @samp
-@item -c
-Print the differing characters.  Display control characters as a
-@samp{^} followed by a letter of the alphabet and precede characters
-that have the high bit set with @samp{M-} (which stands for ``meta'').
-
-@item --ignore-initial=@var{bytes}
-Ignore any differences in the the first @var{bytes} bytes of the input files.
-Treat files with fewer than @var{bytes} bytes as if they are empty.
-
-@item -l
-Print the (decimal) offsets and (octal) values of all differing bytes.
-
-@item --print-chars
-Print the differing characters.  Display control characters as a
-@samp{^} followed by a letter of the alphabet and precede characters
-that have the high bit set with @samp{M-} (which stands for ``meta'').
-
-@item --quiet
-@itemx -s
-@itemx --silent
-Do not print anything; only return an exit status indicating whether
-the files differ.
-
-@item --verbose
-Print the (decimal) offsets and (octal) values of all differing bytes.
-
-@item -v
-@item --version
-Output the version number of @code{cmp}.
-@end table
-
-@node Invoking diff, Invoking diff3, Invoking cmp, Top
-@chapter Invoking @code{diff}
-@cindex invoking @code{diff}
-@cindex @code{diff} invocation
-
-The format for running the @code{diff} command is:
-
-@example
-diff @var{options}@dots{} @var{from-file} @var{to-file}
-@end example
-
-In the simplest case, @code{diff} compares the contents of the two files
-@var{from-file} and @var{to-file}.  A file name of @samp{-} stands for
-text read from the standard input.  As a special case, @samp{diff - -}
-compares a copy of standard input to itself.
-
-If @var{from-file} is a directory and @var{to-file} is not, @code{diff}
-compares the file in @var{from-file} whose file name is that of @var{to-file},
-and vice versa.  The non-directory file must not be @samp{-}.
-
-If both @var{from-file} and @var{to-file} are directories,
-@code{diff} compares corresponding files in both directories, in
-alphabetical order; this comparison is not recursive unless the
-@samp{-r} or @samp{--recursive} option is given.  @code{diff} never
-compares the actual contents of a directory as if it were a file.  The
-file that is fully specified may not be standard input, because standard
-input is nameless and the notion of ``file with the same name'' does not
-apply.
-
-@code{diff} options begin with @samp{-}, so normally @var{from-file} and
-@var{to-file} may not begin with @samp{-}.  However, @samp{--} as an
-argument by itself treats the remaining arguments as file names even if
-they begin with @samp{-}.
-
-An exit status of 0 means no differences were found, 1 means some
-differences were found, and 2 means trouble.
-
-@menu
-* diff Options::	Summary of options to @code{diff}.
-@end menu
-
-@node diff Options, , , Invoking diff
-@section Options to @code{diff}
-@cindex @code{diff} options
-@cindex options for @code{diff}
-
-Below is a summary of all of the options that GNU @code{diff} accepts.
-Most options have two equivalent names, one of which is a single letter
-preceded by @samp{-}, and the other of which is a long name preceded by
-@samp{--}.  Multiple single letter options (unless they take an
-argument) can be combined into a single command line word: @samp{-ac} is
-equivalent to @samp{-a -c}.  Long named options can be abbreviated to
-any unique prefix of their name.  Brackets ([ and ]) indicate that an
-option takes an optional argument.
-
-@table @samp
-@item -@var{lines}
-Show @var{lines} (an integer) lines of context.  This option does not
-specify an output format by itself; it has no effect unless it is
-combined with @samp{-c} (@pxref{Context Format}) or @samp{-u}
-(@pxref{Unified Format}).  This option is obsolete.  For proper
-operation, @code{patch} typically needs at least two lines of context.
-
-@item -a
-Treat all files as text and compare them line-by-line, even if they
-do not seem to be text.  @xref{Binary}.
-
-@item -b
-Ignore changes in amount of white space.  @xref{White Space}.
-
-@item -B
-Ignore changes that just insert or delete blank lines.  @xref{Blank
-Lines}.
-
-@item --binary
-Read and write data in binary mode.  @xref{Binary}.
-
-@item --brief
-Report only whether the files differ, not the details of the
-differences.  @xref{Brief}.
-
-@item -c
-Use the context output format.  @xref{Context Format}.
-
-@item -C @var{lines}
-@itemx --context@r{[}=@var{lines}@r{]}
-Use the context output format, showing @var{lines} (an integer) lines of
-context, or three if @var{lines} is not given.  @xref{Context Format}.
-For proper operation, @code{patch} typically needs at least two lines of
-context.
-
-@item --changed-group-format=@var{format}
-Use @var{format} to output a line group containing differing lines from
-both files in if-then-else format.  @xref{Line Group Formats}.
-
-@item -d
-Change the algorithm perhaps find a smaller set of changes.  This makes
-@code{diff} slower (sometimes much slower).  @xref{diff Performance}.
-
-@item -D @var{name}
-Make merged @samp{#ifdef} format output, conditional on the preprocessor
-macro @var{name}.  @xref{If-then-else}.
-
-@item -e
-@itemx --ed
-Make output that is a valid @code{ed} script.  @xref{ed Scripts}.
-
-@item --exclude=@var{pattern}
-When comparing directories, ignore files and subdirectories whose basenames
-match @var{pattern}.  @xref{Comparing Directories}.
-
-@item --exclude-from=@var{file}
-When comparing directories, ignore files and subdirectories whose basenames
-match any pattern contained in @var{file}.  @xref{Comparing Directories}.
-
-@item --expand-tabs
-Expand tabs to spaces in the output, to preserve the alignment of tabs
-in the input files.  @xref{Tabs}.
-
-@item -f
-Make output that looks vaguely like an @code{ed} script but has changes
-in the order they appear in the file.  @xref{Forward ed}.
-
-@item -F @var{regexp}
-In context and unified format, for each hunk of differences, show some
-of the last preceding line that matches @var{regexp}.  @xref{Specified
-Headings}.
-
-@item --forward-ed
-Make output that looks vaguely like an @code{ed} script but has changes
-in the order they appear in the file.  @xref{Forward ed}.
-
-@item -h
-This option currently has no effect; it is present for Unix
-compatibility.
-
-@item -H
-Use heuristics to speed handling of large files that have numerous
-scattered small changes.  @xref{diff Performance}.
-
-@item --horizon-lines=@var{lines}
-Do not discard the last @var{lines} lines of the common prefix
-and the first @var{lines} lines of the common suffix.
-@xref{diff Performance}.
-
-@item -i
-Ignore changes in case; consider upper- and lower-case letters
-equivalent.  @xref{Case Folding}.
-
-@item -I @var{regexp}
-Ignore changes that just insert or delete lines that match @var{regexp}.
-@xref{Specified Folding}.
-
-@item --ifdef=@var{name}
-Make merged if-then-else output using @var{name}.  @xref{If-then-else}.
-
-@item --ignore-all-space
-Ignore white space when comparing lines.  @xref{White Space}.
-
-@item --ignore-blank-lines
-Ignore changes that just insert or delete blank lines.  @xref{Blank
-Lines}.
-
-@item --ignore-case
-Ignore changes in case; consider upper- and lower-case to be the same.
-@xref{Case Folding}.
-
-@item --ignore-matching-lines=@var{regexp}
-Ignore changes that just insert or delete lines that match @var{regexp}.
-@xref{Specified Folding}.
-
-@item --ignore-space-change
-Ignore changes in amount of white space.
-@xref{White Space}.
-
-@item --initial-tab
-Output a tab rather than a space before the text of a line in normal or
-context format.  This causes the alignment of tabs in the line to look
-normal.  @xref{Tabs}.
-
-@item -l
-Pass the output through @code{pr} to paginate it.  @xref{Pagination}.
-
-@item -L @var{label}
-Use @var{label} instead of the file name in the context format
-(@pxref{Context Format}) and unified format (@pxref{Unified Format})
-headers.  @xref{RCS}.
-
-@item --label=@var{label}
-Use @var{label} instead of the file name in the context format
-(@pxref{Context Format}) and unified format (@pxref{Unified Format})
-headers.
-
-@item --left-column
-Print only the left column of two common lines in side by side format.
-@xref{Side by Side Format}.
-
-@item --line-format=@var{format}
-Use @var{format} to output all input lines in if-then-else format.
-@xref{Line Formats}.
-
-@item --minimal
-Change the algorithm to perhaps find a smaller set of changes.  This
-makes @code{diff} slower (sometimes much slower).  @xref{diff
-Performance}.
-
-@item -n
-Output RCS-format diffs; like @samp{-f} except that each command
-specifies the number of lines affected.  @xref{RCS}.
-
-@item -N
-@itemx --new-file
-In directory comparison, if a file is found in only one directory,
-treat it as present but empty in the other directory.  @xref{Comparing
-Directories}.
-
-@item --new-group-format=@var{format}
-Use @var{format} to output a group of lines taken from just the second
-file in if-then-else format.  @xref{Line Group Formats}.
-
-@item --new-line-format=@var{format}
-Use @var{format} to output a line taken from just the second file in
-if-then-else format.  @xref{Line Formats}.
-
-@item --old-group-format=@var{format}
-Use @var{format} to output a group of lines taken from just the first
-file in if-then-else format.  @xref{Line Group Formats}.
-
-@item --old-line-format=@var{format}
-Use @var{format} to output a line taken from just the first file in
-if-then-else format.  @xref{Line Formats}.
-
-@item -p
-Show which C function each change is in.  @xref{C Function Headings}.
-
-@item -P
-When comparing directories, if a file appears only in the second
-directory of the two, treat it as present but empty in the other.
-@xref{Comparing Directories}.
-
-@item --paginate
-Pass the output through @code{pr} to paginate it.  @xref{Pagination}.
-
-@item -q
-Report only whether the files differ, not the details of the
-differences.  @xref{Brief}.
-
-@item -r
-When comparing directories, recursively compare any subdirectories
-found.  @xref{Comparing Directories}.
-
-@item --rcs
-Output RCS-format diffs; like @samp{-f} except that each command
-specifies the number of lines affected.  @xref{RCS}.
-
-@item --recursive
-When comparing directories, recursively compare any subdirectories
-found.  @xref{Comparing Directories}.
-
-@item --report-identical-files
-Report when two files are the same.  @xref{Comparing Directories}.
-
-@item -s
-Report when two files are the same.  @xref{Comparing Directories}.
-
-@item -S @var{file}
-When comparing directories, start with the file @var{file}.  This is
-used for resuming an aborted comparison.  @xref{Comparing Directories}.
-
-@item --sdiff-merge-assist
-Print extra information to help @code{sdiff}.  @code{sdiff} uses this
-option when it runs @code{diff}.  This option is not intended for users
-to use directly.
-
-@item --show-c-function
-Show which C function each change is in.  @xref{C Function Headings}.
-
-@item --show-function-line=@var{regexp}
-In context and unified format, for each hunk of differences, show some
-of the last preceding line that matches @var{regexp}.  @xref{Specified
-Headings}.
-
-@item --side-by-side
-Use the side by side output format.  @xref{Side by Side Format}.
-
-@item --speed-large-files
-Use heuristics to speed handling of large files that have numerous
-scattered small changes.  @xref{diff Performance}.
-
-@item --starting-file=@var{file}
-When comparing directories, start with the file @var{file}.  This is
-used for resuming an aborted comparison.  @xref{Comparing Directories}.
-
-@item --suppress-common-lines
-Do not print common lines in side by side format.
-@xref{Side by Side Format}.
-
-@item -t
-Expand tabs to spaces in the output, to preserve the alignment of tabs
-in the input files.  @xref{Tabs}.
-
-@item -T
-Output a tab rather than a space before the text of a line in normal or
-context format.  This causes the alignment of tabs in the line to look
-normal.  @xref{Tabs}.
-
-@item --text
-Treat all files as text and compare them line-by-line, even if they
-do not appear to be text.  @xref{Binary}.
-
-@item -u
-Use the unified output format.  @xref{Unified Format}.
-
-@item --unchanged-group-format=@var{format}
-Use @var{format} to output a group of common lines taken from both files
-in if-then-else format.  @xref{Line Group Formats}.
-
-@item --unchanged-line-format=@var{format}
-Use @var{format} to output a line common to both files in if-then-else
-format.  @xref{Line Formats}.
-
-@item --unidirectional-new-file
-When comparing directories, if a file appears only in the second
-directory of the two, treat it as present but empty in the other.
-@xref{Comparing Directories}.
-
-@item -U @var{lines}
-@itemx --unified@r{[}=@var{lines}@r{]}
-Use the unified output format, showing @var{lines} (an integer) lines of
-context, or three if @var{lines} is not given.  @xref{Unified Format}.
-For proper operation, @code{patch} typically needs at least two lines of
-context.
-
-@item -v
-@itemx --version
-Output the version number of @code{diff}.
-
-@item -w
-Ignore white space when comparing lines.  @xref{White Space}.
-
-@item -W @var{columns}
-@itemx --width=@var{columns}
-Use an output width of @var{columns} in side by side format.
-@xref{Side by Side Format}.
-
-@item -x @var{pattern}
-When comparing directories, ignore files and subdirectories whose basenames
-match @var{pattern}.  @xref{Comparing Directories}.
-
-@item -X @var{file}
-When comparing directories, ignore files and subdirectories whose basenames
-match any pattern contained in @var{file}.  @xref{Comparing Directories}.
-
-@item -y
-Use the side by side output format.  @xref{Side by Side Format}.
-@end table
-
-@node Invoking diff3, Invoking patch, Invoking diff, Top
-@chapter Invoking @code{diff3}
-@cindex invoking @code{diff3}
-@cindex @code{diff3} invocation
-
-The @code{diff3} command compares three files and outputs descriptions
-of their differences.  Its arguments are as follows:
-
-@example
-diff3 @var{options}@dots{} @var{mine} @var{older} @var{yours}
-@end example
-
-The files to compare are @var{mine}, @var{older}, and @var{yours}.
-At most one of these three file names may be @samp{-},
-which tells @code{diff3} to read the standard input for that file.
-
-An exit status of 0 means @code{diff3} was successful, 1 means some
-conflicts were found, and 2 means trouble.
-
-@menu
-* diff3 Options::		Summary of options to @code{diff3}.
-@end menu
-
-@node diff3 Options, , , Invoking diff3
-@section Options to @code{diff3}
-@cindex @code{diff3} options
-@cindex options for @code{diff3}
-
-Below is a summary of all of the options that GNU @code{diff3}
-accepts.  Multiple single letter options (unless they take an argument)
-can be combined into a single command line argument.
-
-@table @samp
-@item -a
-Treat all files as text and compare them line-by-line, even if they
-do not appear to be text.  @xref{Binary}.
-
-@item -A
-Incorporate all changes from @var{older} to @var{yours} into @var{mine},
-surrounding all conflicts with bracket lines.
-@xref{Marking Conflicts}.
-
-@item -e
-Generate an @code{ed} script that incorporates all the changes from
-@var{older} to @var{yours} into @var{mine}.  @xref{Which Changes}.
-
-@item -E
-Like @samp{-e}, except bracket lines from overlapping changes' first
-and third files.
-@xref{Marking Conflicts}.
-With @samp{-e}, an overlapping change looks like this:
-
-@example
-<<<<<<< @var{mine}
-@r{lines from @var{mine}}
-=======
-@r{lines from @var{yours}}
->>>>>>> @var{yours}
-@end example
-
-@item --ed
-Generate an @code{ed} script that incorporates all the changes from
-@var{older} to @var{yours} into @var{mine}.  @xref{Which Changes}.
-
-@item --easy-only
-Like @samp{-e}, except output only the nonoverlapping changes.
-@xref{Which Changes}.
-
-@item -i
-Generate @samp{w} and @samp{q} commands at the end of the @code{ed}
-script for System V compatibility.  This option must be combined with
-one of the @samp{-AeExX3} options, and may not be combined with @samp{-m}.
-@xref{Saving the Changed File}.
-
-@item --initial-tab
-Output a tab rather than two spaces before the text of a line in normal format.
-This causes the alignment of tabs in the line to look normal.  @xref{Tabs}.
-
-@item -L @var{label}
-@itemx --label=@var{label}
-Use the label @var{label} for the brackets output by the @samp{-A},
-@samp{-E} and @samp{-X} options.  This option may be given up to three
-times, one for each input file.  The default labels are the names of
-the input files.  Thus @samp{diff3 -L X -L Y -L Z -m A B C} acts like
-@samp{diff3 -m A B C}, except that the output looks like it came from
-files named @samp{X}, @samp{Y} and @samp{Z} rather than from files
-named @samp{A}, @samp{B} and @samp{C}.  @xref{Marking Conflicts}.
-
-@item -m
-@itemx --merge
-Apply the edit script to the first file and send the result to standard
-output.  Unlike piping the output from @code{diff3} to @code{ed}, this
-works even for binary files and incomplete lines.  @samp{-A} is assumed
-if no edit script option is specified.  @xref{Bypassing ed}.
-
-@item --overlap-only
-Like @samp{-e}, except output only the overlapping changes.
-@xref{Which Changes}.
-
-@item --show-all
-Incorporate all unmerged changes from @var{older} to @var{yours} into
-@var{mine}, surrounding all overlapping changes with bracket lines.
-@xref{Marking Conflicts}.
-
-@item --show-overlap
-Like @samp{-e}, except bracket lines from overlapping changes' first
-and third files.
-@xref{Marking Conflicts}.
-
-@item -T
-Output a tab rather than two spaces before the text of a line in normal format.
-This causes the alignment of tabs in the line to look normal.  @xref{Tabs}.
-
-@item --text
-Treat all files as text and compare them line-by-line, even if they
-do not appear to be text.  @xref{Binary}.
-
-@item -v
-@itemx --version
-Output the version number of @code{diff3}.
-
-@item -x
-Like @samp{-e}, except output only the overlapping changes.
-@xref{Which Changes}.
-
-@item -X
-Like @samp{-E}, except output only the overlapping changes.
-In other words, like @samp{-x}, except bracket changes as in @samp{-E}.
-@xref{Marking Conflicts}.
-
-@item -3
-Like @samp{-e}, except output only the nonoverlapping changes.
-@xref{Which Changes}.
-@end table
-
-@node Invoking patch, Invoking sdiff, Invoking diff3, Top
-@chapter Invoking @code{patch}
-@cindex invoking @code{patch}
-@cindex @code{patch} invocation
-
-Normally @code{patch} is invoked like this:
-
-@example
-patch <@var{patchfile}
-@end example
-
-The full format for invoking @code{patch} is:
-
-@example
-patch @var{options}@dots{} @r{[}@var{origfile} @r{[}@var{patchfile}@r{]}@r{]} @r{[}+ @var{options}@dots{} @r{[}@var{origfile}@r{]}@r{]}@dots{}
-@end example
-
-If you do not specify @var{patchfile}, or if @var{patchfile} is
-@samp{-}, @code{patch} reads the patch (that is, the @code{diff} output)
-from the standard input.
-
-You can specify one or more of the original files as @var{orig} arguments;
-each one and options for interpreting it is separated from the others with a
-@samp{+}.  @xref{Multiple Patches}, for more information.
-
-If you do not specify an input file on the command line, @code{patch}
-tries to figure out from the @dfn{leading text} (any text in the patch
-that comes before the @code{diff} output) which file to edit.  In the
-header of a context or unified diff, @code{patch} looks in lines
-beginning with @samp{***}, @samp{---}, or @samp{+++}; among those, it
-chooses the shortest name of an existing file.  Otherwise, if there is
-an @samp{Index:} line in the leading text, @code{patch} tries to use the
-file name from that line.  If @code{patch} cannot figure out the name of
-an existing file from the leading text, it prompts you for the name of
-the file to patch.
-
-If the input file does not exist or is read-only, and a suitable RCS or
-SCCS file exists, @code{patch} attempts to check out or get the file
-before proceeding.
-
-By default, @code{patch} replaces the original input file with the
-patched version, after renaming the original file into a backup file
-(@pxref{Backups}, for a description of how @code{patch} names backup
-files).  You can also specify where to put the output with the @samp{-o
-@var{output-file}} or @samp{--output=@var{output-file}} option.
-
-@menu
-* patch Directories::	Changing directory and stripping directories.
-* Backups::		Backup file names.
-* Rejects::		Reject file names.
-* patch Options::	Summary table of options to @code{patch}.
-@end menu
-
-@node patch Directories, Backups, , Invoking patch
-@section Applying Patches in Other Directories
-@cindex directories and patch
-@cindex patching directories
-
-The @samp{-d @var{directory}} or @samp{--directory=@var{directory}}
-option to @code{patch} makes directory @var{directory} the current
-directory for interpreting both file names in the patch file, and file
-names given as arguments to other options (such as @samp{-B} and
-@samp{-o}).  For example, while in a news reading program, you can patch
-a file in the @file{/usr/src/emacs} directory directly from the article
-containing the patch like this:
-
-@example
-| patch -d /usr/src/emacs
-@end example
-
-Sometimes the file names given in a patch contain leading directories,
-but you keep your files in a directory different from the one given in
-the patch.  In those cases, you can use the
-@samp{-p@r{[}@var{number}@r{]}} or @samp{--strip@r{[}=@var{number}@r{]}}
-option to set the file name strip count to @var{number}.  The strip
-count tells @code{patch} how many slashes, along with the directory
-names between them, to strip from the front of file names.  @samp{-p}
-with no @var{number} given is equivalent to @samp{-p0}.  By default,
-@code{patch} strips off all leading directories, leaving just the base file
-names, except that when a file name given in the patch is a relative
-file name and all of its leading directories already exist, @code{patch} does
-not strip off the leading directory.  (A @dfn{relative} file name is one
-that does not start with a slash.)
-
-@code{patch} looks for each file (after any slashes have been stripped)
-in the current directory, or if you used the @samp{-d @var{directory}}
-option, in that directory.
-
-For example, suppose the file name in the patch file is
-@file{/gnu/src/emacs/etc/NEWS}.  Using @samp{-p} or @samp{-p0} gives the
-entire file name unmodified, @samp{-p1} gives
-@file{gnu/src/emacs/etc/NEWS} (no leading slash), @samp{-p4} gives
-@file{etc/NEWS}, and not specifying @samp{-p} at all gives @file{NEWS}.
-
-@node Backups, Rejects, patch Directories, Invoking patch
-@section Backup File Names
-@cindex backup file names
-
-Normally, @code{patch} renames an original input file into a backup file
-by appending to its name the extension @samp{.orig}, or @samp{~} on
-systems that do not support long file names.  The @samp{-b
-@var{backup-suffix}} or @samp{--suffix=@var{backup-suffix}} option uses
-@var{backup-suffix} as the backup extension instead.
-
-Alternately, you can specify the extension for backup files with the
-@code{SIMPLE_BACKUP_SUFFIX} environment variable, which the options
-override.
-
-@code{patch} can also create numbered backup files the way GNU Emacs
-does.  With this method, instead of having a single backup of each file,
-@code{patch} makes a new backup file name each time it patches a file.
-For example, the backups of a file named @file{sink} would be called,
-successively, @file{sink.~1~}, @file{sink.~2~}, @file{sink.~3~}, etc.
-
-The @samp{-V @var{backup-style}} or
-@samp{--version-control=@var{backup-style}} option takes as an argument
-a method for creating backup file names.  You can alternately control
-the type of backups that @code{patch} makes with the
-@code{VERSION_CONTROL} environment variable, which the @samp{-V} option
-overrides.  The value of the @code{VERSION_CONTROL} environment variable
-and the argument to the @samp{-V} option are like the GNU Emacs
-@code{version-control} variable (@pxref{Backups,
-emacs, The GNU Emacs Manual}, for more information on backup versions in
-Emacs).  They also recognize synonyms that are more descriptive.  The
-valid values are listed below; unique abbreviations are acceptable.
-
-@table @samp
-@item t
-@itemx numbered
-Always make numbered backups.
-
-@item nil
-@itemx existing
-Make numbered backups of files that already have them, simple backups of
-the others.  This is the default.
-
-@item never
-@itemx simple
-Always make simple backups.
-@end table
-
-Alternately, you can tell @code{patch} to prepend a prefix, such as a
-directory name, to produce backup file names.  The @samp{-B
-@var{backup-prefix}} or @samp{--prefix=@var{backup-prefix}} option makes
-backup files by prepending @var{backup-prefix} to them.  If you use this
-option, @code{patch} ignores any @samp{-b} option that you give.
-
-If the backup file already exists, @code{patch} creates a new backup
-file name by changing the first lowercase letter in the last component
-of the file name into uppercase.  If there are no more lowercase letters
-in the name, it removes the first character from the name.  It repeats
-this process until it comes up with a backup file name that does not
-already exist.
-
-If you specify the output file with the @samp{-o} option, that file is
-the one that is backed up, not the input file.
-
-@node Rejects, patch Options, Backups, Invoking patch
-@section Reject File Names
-@cindex reject file names
-
-The names for reject files (files containing patches that @code{patch}
-could not find a place to apply) are normally the name of the output
-file with @samp{.rej} appended (or @samp{#} on systems that do not
-support long file names).
-
-Alternatively, you can tell @code{patch} to place all of the rejected
-patches in a single file.  The @samp{-r @var{reject-file}} or
-@samp{--reject-file=@var{reject-file}} option uses @var{reject-file} as
-the reject file name.
-
-@node patch Options, , Rejects, Invoking patch
-@section Options to @code{patch}
-@cindex @code{patch} options
-@cindex options for @code{patch}
-
-Here is a summary of all of the options that @code{patch} accepts.
-Older versions of @code{patch} do not accept long-named options or the
-@samp{-t}, @samp{-E}, or @samp{-V} options.
-
-Multiple single-letter options that do not take an argument can be
-combined into a single command line argument (with only one dash).
-Brackets ([ and ]) indicate that an option takes an optional argument.
-
-@table @samp
-@item -b @var{backup-suffix}
-Use @var{backup-suffix} as the backup extension instead of
-@samp{.orig} or @samp{~}.  @xref{Backups}.
-
-@item -B @var{backup-prefix}
-Use @var{backup-prefix} as a prefix to the backup file name.  If this
-option is specified, any @samp{-b} option is ignored.  @xref{Backups}.
-
-@item --batch
-Do not ask any questions.  @xref{patch Messages}.
-
-@item -c
-@itemx --context
-Interpret the patch file as a context diff.  @xref{patch Input}.
-
-@item -d @var{directory}
-@itemx --directory=@var{directory}
-Makes directory @var{directory} the current directory for interpreting
-both file names in the patch file, and file names given as arguments to
-other options.  @xref{patch Directories}.
-
-@item -D @var{name}
-Make merged if-then-else output using @var{format}.  @xref{If-then-else}.
-
-@item --debug=@var{number}
-Set internal debugging flags.  Of interest only to @code{patch}
-patchers.
-
-@item -e
-@itemx --ed
-Interpret the patch file as an @code{ed} script.  @xref{patch Input}.
-
-@item -E
-Remove output files that are empty after the patches have been applied.
-@xref{Empty Files}.
-
-@item -f
-Assume that the user knows exactly what he or she is doing, and do not
-ask any questions.  @xref{patch Messages}.
-
-@item -F @var{lines}
-Set the maximum fuzz factor to @var{lines}.  @xref{Inexact}.
-
-@item --force
-Assume that the user knows exactly what he or she is doing, and do not
-ask any questions.  @xref{patch Messages}.
-
-@item --forward
-Ignore patches that @code{patch} thinks are reversed or already applied.
-See also @samp{-R}.  @xref{Reversed Patches}.
-
-@item --fuzz=@var{lines}
-Set the maximum fuzz factor to @var{lines}.  @xref{Inexact}.
-
-@item --help
-Print a summary of the options that @code{patch} recognizes, then exit.
-
-@item --ifdef=@var{name}
-Make merged if-then-else output using @var{format}.  @xref{If-then-else}.
-
-@item --ignore-white-space
-@itemx -l
-Let any sequence of white space in the patch file match any sequence of
-white space in the input file.  @xref{Changed White Space}.
-
-@item -n
-@itemx --normal
-Interpret the patch file as a normal diff.  @xref{patch Input}.
-
-@item -N
-Ignore patches that @code{patch} thinks are reversed or already applied.
-See also @samp{-R}.  @xref{Reversed Patches}.
-
-@item -o @var{output-file}
-@itemx --output=@var{output-file}
-Use @var{output-file} as the output file name.  @xref{patch Options}.
-
-@item -p@r{[}@var{number}@r{]}
-Set the file name strip count to @var{number}.  @xref{patch Directories}.
-
-@item --prefix=@var{backup-prefix}
-Use @var{backup-prefix} as a prefix to the backup file name.  If this
-option is specified, any @samp{-b} option is ignored.  @xref{Backups}.
-
-@item --quiet
-Work silently unless an error occurs.  @xref{patch Messages}.
-
-@item -r @var{reject-file}
-Use @var{reject-file} as the reject file name.  @xref{Rejects}.
-
-@item -R
-Assume that this patch was created with the old and new files swapped.
-@xref{Reversed Patches}.
-
-@item --reject-file=@var{reject-file}
-Use @var{reject-file} as the reject file name.  @xref{Rejects}.
-
-@item --remove-empty-files
-Remove output files that are empty after the patches have been applied.
-@xref{Empty Files}.
-
-@item --reverse
-Assume that this patch was created with the old and new files swapped.
-@xref{Reversed Patches}.
-
-@item -s
-Work silently unless an error occurs.  @xref{patch Messages}.
-
-@item -S
-Ignore this patch from the patch file, but continue looking for the next
-patch in the file.  @xref{Multiple Patches}.
-
-@item --silent
-Work silently unless an error occurs.  @xref{patch Messages}.
-
-@item --skip
-Ignore this patch from the patch file, but continue looking for the next
-patch in the file.  @xref{Multiple Patches}.
-
-@item --strip@r{[}=@var{number}@r{]}
-Set the file name strip count to @var{number}.  @xref{patch Directories}.
-
-@item --suffix=@var{backup-suffix}
-Use @var{backup-suffix} as the backup extension instead of
-@samp{.orig} or @samp{~}.  @xref{Backups}.
-
-@item -t
-Do not ask any questions.  @xref{patch Messages}.
-
-@item -u
-@itemx --unified
-Interpret the patch file as a unified diff.  @xref{patch Input}.
-
-@item -v
-Output the revision header and patch level of @code{patch}.
-
-@item -V @var{backup-style}
-Select the kind of backups to make.  @xref{Backups}.
-
-@item --version
-Output the revision header and patch level of @code{patch}, then exit.
-
-@item --version=control=@var{backup-style}
-Select the kind of backups to make.  @xref{Backups}.
-
-@item -x @var{number}
-Set internal debugging flags.  Of interest only to @code{patch}
-patchers.
-@end table
-
-@node Invoking sdiff, Incomplete Lines, Invoking patch, Top
-@chapter Invoking @code{sdiff}
-@cindex invoking @code{sdiff}
-@cindex @code{sdiff} invocation
-
-The @code{sdiff} command merges two files and interactively outputs the
-results.  Its arguments are as follows:
-
-@example
-sdiff -o @var{outfile} @var{options}@dots{} @var{from-file} @var{to-file}
-@end example
-
-This merges @var{from-file} with @var{to-file}, with output to @var{outfile}.
-If @var{from-file} is a directory and @var{to-file} is not, @code{sdiff}
-compares the file in @var{from-file} whose file name is that of @var{to-file},
-and vice versa.  @var{from-file} and @var{to-file} may not both be
-directories.
-
-@code{sdiff} options begin with @samp{-}, so normally @var{from-file}
-and @var{to-file} may not begin with @samp{-}.  However, @samp{--} as an
-argument by itself treats the remaining arguments as file names even if
-they begin with @samp{-}.  You may not use @samp{-} as an input file.
-
-An exit status of 0 means no differences were found, 1 means some
-differences were found, and 2 means trouble.
-
-@code{sdiff} without @samp{-o} (or @samp{--output}) produces a
-side-by-side difference.  This usage is obsolete; use @samp{diff
---side-by-side} instead.
-
-@menu
-* sdiff Options::	Summary of options to @code{diff}.
-@end menu
-
-@node sdiff Options, , , Invoking sdiff
-@section Options to @code{sdiff}
-@cindex @code{sdiff} options
-@cindex options for @code{sdiff}
-
-Below is a summary of all of the options that GNU @code{sdiff} accepts.
-Each option has two equivalent names, one of which is a single
-letter preceded by @samp{-}, and the other of which is a long name
-preceded by @samp{--}.  Multiple single letter options (unless they take
-an argument) can be combined into a single command line argument.  Long
-named options can be abbreviated to any unique prefix of their name.
-
-@table @samp
-@item -a
-Treat all files as text and compare them line-by-line, even if they
-do not appear to be text.  @xref{Binary}.
-
-@item -b
-Ignore changes in amount of white space.  @xref{White Space}.
-
-@item -B
-Ignore changes that just insert or delete blank lines.  @xref{Blank
-Lines}.
-
-@item -d
-Change the algorithm to perhaps find a smaller set of changes.  This
-makes @code{sdiff} slower (sometimes much slower).  @xref{diff
-Performance}.
-
-@item -H
-Use heuristics to speed handling of large files that have numerous
-scattered small changes.  @xref{diff Performance}.
-
-@item --expand-tabs
-Expand tabs to spaces in the output, to preserve the alignment of tabs
-in the input files.  @xref{Tabs}.
-
-@item -i
-Ignore changes in case; consider upper- and lower-case to be the same.
-@xref{Case Folding}.
-
-@item -I @var{regexp}
-Ignore changes that just insert or delete lines that match @var{regexp}.
-@xref{Specified Folding}.
-
-@item --ignore-all-space
-Ignore white space when comparing lines.  @xref{White Space}.
-
-@item --ignore-blank-lines
-Ignore changes that just insert or delete blank lines.  @xref{Blank
-Lines}.
-
-@item --ignore-case
-Ignore changes in case; consider upper- and lower-case to be the same.
-@xref{Case Folding}.
-
-@item --ignore-matching-lines=@var{regexp}
-Ignore changes that just insert or delete lines that match @var{regexp}.
-@xref{Specified Folding}.
-
-@item --ignore-space-change
-Ignore changes in amount of white space.
-@xref{White Space}.
-
-@item -l
-@itemx --left-column
-Print only the left column of two common lines.
-@xref{Side by Side Format}.
-
-@item --minimal
-Change the algorithm to perhaps find a smaller set of changes.  This
-makes @code{sdiff} slower (sometimes much slower).  @xref{diff
-Performance}.
-
-@item -o @var{file}
-@itemx --output=@var{file}
-Put merged output into @var{file}.  This option is required for merging.
-
-@item -s
-@itemx --suppress-common-lines
-Do not print common lines.  @xref{Side by Side Format}.
-
-@item --speed-large-files
-Use heuristics to speed handling of large files that have numerous
-scattered small changes.  @xref{diff Performance}.
-
-@item -t
-Expand tabs to spaces in the output, to preserve the alignment of tabs
-in the input files.  @xref{Tabs}.
-
-@item --text
-Treat all files as text and compare them line-by-line, even if they
-do not appear to be text.  @xref{Binary}.
-
-@item -v
-@itemx --version
-Output the version number of @code{sdiff}.
-
-@item -w @var{columns}
-@itemx --width=@var{columns}
-Use an output width of @var{columns}.  @xref{Side by Side Format}.
-Note that for historical reasons, this option is @samp{-W} in @code{diff},
-@samp{-w} in @code{sdiff}.
-
-@item -W
-Ignore horizontal white space when comparing lines.  @xref{White Space}.
-Note that for historical reasons, this option is @samp{-w} in @code{diff},
-@samp{-W} in @code{sdiff}.
-@end table
-
-@node Incomplete Lines, Projects, Invoking sdiff, Top
-@chapter Incomplete Lines
-@cindex incomplete lines
-@cindex full lines
-@cindex newline treatment by @code{diff}
-
-When an input file ends in a non-newline character, its last line is
-called an @dfn{incomplete line} because its last character is not a
-newline.  All other lines are called @dfn{full lines} and end in a
-newline character.  Incomplete lines do not match full lines unless
-differences in white space are ignored (@pxref{White Space}).
-
-An incomplete line is normally distinguished on output from a full line
-by a following line that starts with @samp{\}.  However, the RCS format
-(@pxref{RCS}) outputs the incomplete line as-is, without any trailing
-newline or following line.  The side by side format normally represents
-incomplete lines as-is, but in some cases uses a @samp{\} or @samp{/}
-gutter marker; @xref{Side by Side}.  The if-then-else line format
-preserves a line's incompleteness with @samp{%L}, and discards the
-newline with @samp{%l}; @xref{Line Formats}.  Finally, with the
-@code{ed} and forward @code{ed} output formats (@pxref{Output Formats})
-@code{diff} cannot represent an incomplete line, so it pretends there
-was a newline and reports an error.
-
-For example, suppose @file{F} and @file{G} are one-byte files that
-contain just @samp{f} and @samp{g}, respectively.  Then @samp{diff F G}
-outputs
-
-@example
-1c1
-< f
-\ No newline at end of file
----
-> g
-\ No newline at end of file
-@end example
-
-@noindent
-(The exact message may differ in non-English locales.)
-@samp{diff -n F G} outputs the following without a trailing newline:
-
-@example
-d1 1
-a1 1
-g
-@end example
-
-@samp{diff -e F G} reports two errors and outputs the following:
-
-@example
-1c
-g
-.
-@end example
-
-@node Projects, Concept Index, Incomplete Lines, Top
-@chapter Future Projects
-
-Here are some ideas for improving GNU @code{diff} and @code{patch}.  The
-GNU project has identified some improvements as potential programming
-projects for volunteers.  You can also help by reporting any bugs that
-you find.
-
-If you are a programmer and would like to contribute something to the
-GNU project, please consider volunteering for one of these projects.  If
-you are seriously contemplating work, please write to
-@samp{gnu@@prep.ai.mit.edu} to coordinate with other volunteers.
-
-@menu
-* Shortcomings::	Suggested projects for improvements.
-* Bugs::		Reporting bugs.
-@end menu
-
-@node Shortcomings, Bugs, , Projects
-@section Suggested Projects for Improving GNU @code{diff} and @code{patch}
-@cindex projects for directories
-
-One should be able to use GNU @code{diff} to generate a patch from any
-pair of directory trees, and given the patch and a copy of one such
-tree, use @code{patch} to generate a faithful copy of the other.
-Unfortunately, some changes to directory trees cannot be expressed using
-current patch formats; also, @code{patch} does not handle some of the
-existing formats.  These shortcomings motivate the following suggested
-projects.
-
-@menu
-* Changing Structure::	Handling changes to the directory structure.
-* Special Files::	Handling symbolic links, device special files, etc.
-* Unusual File Names::	Handling file names that contain unusual characters.
-* Arbitrary Limits::	Patching non-text files.
-* Large Files::		Handling files that do not fit in memory.
-* Ignoring Changes::	Ignoring certain changes while showing others.
-@end menu
-
-@node Changing Structure, Special Files, , Shortcomings
-@subsection Handling Changes to the Directory Structure
-@cindex directory structure changes
-
-@code{diff} and @code{patch} do not handle some changes to directory
-structure.  For example, suppose one directory tree contains a directory
-named @samp{D} with some subsidiary files, and another contains a file
-with the same name @samp{D}.  @samp{diff -r} does not output enough
-information for @code{patch} to transform the the directory subtree into
-the file.
-
-There should be a way to specify that a file has been deleted without
-having to include its entire contents in the patch file.  There should
-also be a way to tell @code{patch} that a file was renamed, even if
-there is no way for @code{diff} to generate such information.
-
-These problems can be fixed by extending the @code{diff} output format
-to represent changes in directory structure, and extending @code{patch}
-to understand these extensions.
-
-@node Special Files, Unusual File Names, Changing Structure, Shortcomings
-@subsection Files that are Neither Directories Nor Regular Files
-@cindex special files
-
-Some files are neither directories nor regular files: they are unusual
-files like symbolic links, device special files, named pipes, and
-sockets.  Currently, @code{diff} treats symbolic links like regular files;
-it treats other special files like regular files if they are specified
-at the top level, but simply reports their presence when comparing
-directories.  This means that @code{patch} cannot represent changes
-to such files.  For example, if you change which file a symbolic link
-points to, @code{diff} outputs the difference between the two files,
-instead of the change to the symbolic link.
-
-@c This might not be a good idea; is it wise for root to install devices
-@c this way?
-@code{diff} should optionally report changes to special files specially,
-and @code{patch} should be extended to understand these extensions.
-
-@node Unusual File Names, Arbitrary Limits, Special Files, Shortcomings
-@subsection File Names that Contain Unusual Characters
-@cindex file names with unusual characters
-
-When a file name contains an unusual character like a newline or
-white space, @samp{diff -r} generates a patch that @code{patch} cannot
-parse.  The problem is with format of @code{diff} output, not just with
-@code{patch}, because with odd enough file names one can cause
-@code{diff} to generate a patch that is syntactically correct but
-patches the wrong files.  The format of @code{diff} output should be
-extended to handle all possible file names.
-
-@node Arbitrary Limits, Large Files, Unusual File Names, Shortcomings
-@subsection Arbitrary Limits
-@cindex binary file patching
-
-GNU @code{diff} can analyze files with arbitrarily long lines and files
-that end in incomplete lines.  However, @code{patch} cannot patch such
-files.  The @code{patch} internal limits on line lengths should be
-removed, and @code{patch} should be extended to parse @code{diff}
-reports of incomplete lines.
-
-@node Large Files, Ignoring Changes, Arbitrary Limits, Shortcomings
-@subsection Handling Files that Do Not Fit in Memory
-@cindex large files
-
-@code{diff} operates by reading both files into memory.  This method
-fails if the files are too large, and @code{diff} should have a fallback.
-
-One way to do this is to scan the files sequentially to compute hash
-codes of the lines and put the lines in equivalence classes based only
-on hash code.  Then compare the files normally.  This does produce some
-false matches.
-
-Then scan the two files sequentially again, checking each match to see
-whether it is real.  When a match is not real, mark both the
-``matching'' lines as changed.  Then build an edit script as usual.
-
-The output routines would have to be changed to scan the files
-sequentially looking for the text to print.
-
-@node Ignoring Changes,, Large Files, Shortcomings
-@subsection Ignoring Certain Changes
-
-It would be nice to have a feature for specifying two strings, one in
-@var{from-file} and one in @var{to-file}, which should be considered to
-match.  Thus, if the two strings are @samp{foo} and @samp{bar}, then if
-two lines differ only in that @samp{foo} in file 1 corresponds to
-@samp{bar} in file 2, the lines are treated as identical.
-
-It is not clear how general this feature can or should be, or
-what syntax should be used for it.
-
-@node Bugs, , Shortcomings, Projects
-@section Reporting Bugs
-@cindex bug reports
-@cindex reporting bugs
-
-If you think you have found a bug in GNU @code{cmp}, @code{diff},
-@code{diff3}, @code{sdiff}, or @code{patch}, please report it by
-electronic mail to @samp{bug-gnu-utils@@prep.ai.mit.edu}.  Send as
-precise a description of the problem as you can, including sample input
-files that produce the bug, if applicable.
-
-Because Larry Wall has not released a new version of @code{patch} since
-mid 1988 and the GNU version of @code{patch} has been changed since
-then, please send bug reports for @code{patch} by electronic mail to
-both @samp{bug-gnu-utils@@prep.ai.mit.edu} and
-@samp{lwall@@netlabs.com}.
-
-@node Concept Index, , Projects, Top
-@unnumbered Concept Index
-
-@printindex cp
-
-@shortcontents
-@contents
-@bye
diff --git a/contrib/diff/diff3.c b/contrib/diff/diff3.c
deleted file mode 100644
index 5d94ab8..0000000
--- a/contrib/diff/diff3.c
+++ /dev/null
@@ -1,1778 +0,0 @@
-/* Three way file comparison program (diff3) for Project GNU.
-   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-/* Written by Randy Smith */
-
-#include "system.h"
-#include <stdio.h>
-#include <signal.h>
-#include "getopt.h"
-
-extern char const version_string[];
-
-/*
- * Internal data structures and macros for the diff3 program; includes
- * data structures for both diff3 diffs and normal diffs.
- */
-
-/* Different files within a three way diff.  */
-#define	FILE0	0
-#define	FILE1	1
-#define	FILE2	2
-
-/*
- * A three way diff is built from two two-way diffs; the file which
- * the two two-way diffs share is:
- */
-#define	FILEC	FILE2
-
-/*
- * Different files within a two way diff.
- * FC is the common file, FO the other file.
- */
-#define FO 0
-#define FC 1
-
-/* The ranges are indexed by */
-#define	START	0
-#define	END	1
-
-enum diff_type {
-  ERROR,			/* Should not be used */
-  ADD,				/* Two way diff add */
-  CHANGE,			/* Two way diff change */
-  DELETE,			/* Two way diff delete */
-  DIFF_ALL,			/* All three are different */
-  DIFF_1ST,			/* Only the first is different */
-  DIFF_2ND,			/* Only the second */
-  DIFF_3RD			/* Only the third */
-};
-
-/* Two way diff */
-struct diff_block {
-  int ranges[2][2];		/* Ranges are inclusive */
-  char **lines[2];		/* The actual lines (may contain nulls) */
-  size_t *lengths[2];		/* Line lengths (including newlines, if any) */
-  struct diff_block *next;
-};
-
-/* Three way diff */
-
-struct diff3_block {
-  enum diff_type correspond;	/* Type of diff */
-  int ranges[3][2];		/* Ranges are inclusive */
-  char **lines[3];		/* The actual lines (may contain nulls) */
-  size_t *lengths[3];		/* Line lengths (including newlines, if any) */
-  struct diff3_block *next;
-};
-
-/*
- * Access the ranges on a diff block.
- */
-#define	D_LOWLINE(diff, filenum)	\
-  ((diff)->ranges[filenum][START])
-#define	D_HIGHLINE(diff, filenum)	\
-  ((diff)->ranges[filenum][END])
-#define	D_NUMLINES(diff, filenum)	\
-  (D_HIGHLINE (diff, filenum) - D_LOWLINE (diff, filenum) + 1)
-
-/*
- * Access the line numbers in a file in a diff by relative line
- * numbers (i.e. line number within the diff itself).  Note that these
- * are lvalues and can be used for assignment.
- */
-#define	D_RELNUM(diff, filenum, linenum)	\
-  ((diff)->lines[filenum][linenum])
-#define	D_RELLEN(diff, filenum, linenum)	\
-  ((diff)->lengths[filenum][linenum])
-
-/*
- * And get at them directly, when that should be necessary.
- */
-#define	D_LINEARRAY(diff, filenum)	\
-  ((diff)->lines[filenum])
-#define	D_LENARRAY(diff, filenum)	\
-  ((diff)->lengths[filenum])
-
-/*
- * Next block.
- */
-#define	D_NEXT(diff)	((diff)->next)
-
-/*
- * Access the type of a diff3 block.
- */
-#define	D3_TYPE(diff)	((diff)->correspond)
-
-/*
- * Line mappings based on diffs.  The first maps off the top of the
- * diff, the second off of the bottom.
- */
-#define	D_HIGH_MAPLINE(diff, fromfile, tofile, lineno)	\
-  ((lineno)						\
-   - D_HIGHLINE ((diff), (fromfile))			\
-   + D_HIGHLINE ((diff), (tofile)))
-
-#define	D_LOW_MAPLINE(diff, fromfile, tofile, lineno)	\
-  ((lineno)						\
-   - D_LOWLINE ((diff), (fromfile))			\
-   + D_LOWLINE ((diff), (tofile)))
-
-/*
- * General memory allocation function.
- */
-#define	ALLOCATE(number, type)	\
-  (type *) xmalloc ((number) * sizeof (type))
-
-/* Options variables for flags set on command line.  */
-
-/* If nonzero, treat all files as text files, never as binary.  */
-static int always_text;
-
-/* If nonzero, write out an ed script instead of the standard diff3 format.  */
-static int edscript;
-
-/* If nonzero, in the case of overlapping diffs (type DIFF_ALL),
-   preserve the lines which would normally be deleted from
-   file 1 with a special flagging mechanism.  */
-static int flagging;
-
-/* Number of lines to keep in identical prefix and suffix.  */
-static int horizon_lines = 10;
-
-/* Use a tab to align output lines (-T).  */
-static int tab_align_flag;
-
-/* If nonzero, do not output information for overlapping diffs.  */
-static int simple_only;
-
-/* If nonzero, do not output information for non-overlapping diffs.  */
-static int overlap_only;
-
-/* If nonzero, show information for DIFF_2ND diffs.  */
-static int show_2nd;
-
-/* If nonzero, include `:wq' at the end of the script
-   to write out the file being edited.   */
-static int finalwrite;
-
-/* If nonzero, output a merged file.  */
-static int merge;
-
-static char *program_name;
-
-static VOID *xmalloc PARAMS((size_t));
-static VOID *xrealloc PARAMS((VOID *, size_t));
-
-static char *read_diff PARAMS((char const *, char const *, char **));
-static char *scan_diff_line PARAMS((char *, char **, size_t *, char *, int));
-static enum diff_type process_diff_control PARAMS((char **, struct diff_block *));
-static int compare_line_list PARAMS((char * const[], size_t const[], char * const[], size_t const[], int));
-static int copy_stringlist PARAMS((char * const[], size_t const[], char *[], size_t[], int));
-static int dotlines PARAMS((FILE *, struct diff3_block *, int));
-static int output_diff3_edscript PARAMS((FILE *, struct diff3_block *, int const[3], int const[3], char const *, char const *, char const *));
-static int output_diff3_merge PARAMS((FILE *, FILE *, struct diff3_block *, int const[3], int const[3], char const *, char const *, char const *));
-static size_t myread PARAMS((int, char *, size_t));
-static struct diff3_block *create_diff3_block PARAMS((int, int, int, int, int, int));
-static struct diff3_block *make_3way_diff PARAMS((struct diff_block *, struct diff_block *));
-static struct diff3_block *reverse_diff3_blocklist PARAMS((struct diff3_block *));
-static struct diff3_block *using_to_diff3_block PARAMS((struct diff_block *[2], struct diff_block *[2], int, int, struct diff3_block const *));
-static struct diff_block *process_diff PARAMS((char const *, char const *, struct diff_block **));
-static void check_stdout PARAMS((void));
-static void fatal PARAMS((char const *));
-static void output_diff3 PARAMS((FILE *, struct diff3_block *, int const[3], int const[3]));
-static void perror_with_exit PARAMS((char const *));
-static void try_help PARAMS((char const *));
-static void undotlines PARAMS((FILE *, int, int, int));
-static void usage PARAMS((void));
-
-static char const diff_program[] = DIFF_PROGRAM;
-
-static struct option const longopts[] =
-{
-  {"text", 0, 0, 'a'},
-  {"show-all", 0, 0, 'A'},
-  {"ed", 0, 0, 'e'},
-  {"show-overlap", 0, 0, 'E'},
-  {"label", 1, 0, 'L'},
-  {"merge", 0, 0, 'm'},
-  {"initial-tab", 0, 0, 'T'},
-  {"overlap-only", 0, 0, 'x'},
-  {"easy-only", 0, 0, '3'},
-  {"version", 0, 0, 'v'},
-  {"help", 0, 0, 129},
-  {0, 0, 0, 0}
-};
-
-/*
- * Main program.  Calls diff twice on two pairs of input files,
- * combines the two diffs, and outputs them.
- */
-int
-main (argc, argv)
-     int argc;
-     char **argv;
-{
-  int c, i;
-  int mapping[3];
-  int rev_mapping[3];
-  int incompat = 0;
-  int conflicts_found;
-  struct diff_block *thread0, *thread1, *last_block;
-  struct diff3_block *diff3;
-  int tag_count = 0;
-  char *tag_strings[3];
-  char *commonname;
-  char **file;
-  struct stat statb;
-
-  initialize_main (&argc, &argv);
-  program_name = argv[0];
-
-  while ((c = getopt_long (argc, argv, "aeimvx3AEL:TX", longopts, 0)) != EOF)
-    {
-      switch (c)
-	{
-	case 'a':
-	  always_text = 1;
-	  break;
-	case 'A':
-	  show_2nd = 1;
-	  flagging = 1;
-	  incompat++;
-	  break;
-	case 'x':
-	  overlap_only = 1;
-	  incompat++;
-	  break;
-	case '3':
-	  simple_only = 1;
-	  incompat++;
-	  break;
-	case 'i':
-	  finalwrite = 1;
-	  break;
-	case 'm':
-	  merge = 1;
-	  break;
-	case 'X':
-	  overlap_only = 1;
-	  /* Falls through */
-	case 'E':
-	  flagging = 1;
-	  /* Falls through */
-	case 'e':
-	  incompat++;
-	  break;
-	case 'T':
-	  tab_align_flag = 1;
-	  break;
-	case 'v':
-	  printf ("diff3 - GNU diffutils version %s\n", version_string);
-	  exit (0);
-	case 129:
-	  usage ();
-	  check_stdout ();
-	  exit (0);
-	case 'L':
-	  /* Handle up to three -L options.  */
-	  if (tag_count < 3)
-	    {
-	      tag_strings[tag_count++] = optarg;
-	      break;
-	    }
-	  try_help ("Too many labels were given.  The limit is 3.");
-	default:
-	  try_help (0);
-	}
-    }
-
-  edscript = incompat & ~merge;  /* -AeExX3 without -m implies ed script.  */
-  show_2nd |= ~incompat & merge;  /* -m without -AeExX3 implies -A.  */
-  flagging |= ~incompat & merge;
-
-  if (incompat > 1  /* Ensure at most one of -AeExX3.  */
-      || finalwrite & merge /* -i -m would rewrite input file.  */
-      || (tag_count && ! flagging)) /* -L requires one of -AEX.  */
-    try_help ("incompatible options");
-
-  if (argc - optind != 3)
-    try_help (argc - optind < 3 ? "missing operand" : "extra operand");
-
-  file = &argv[optind];
-
-  for (i = tag_count; i < 3; i++)
-    tag_strings[i] = file[i];
-
-  /* Always compare file1 to file2, even if file2 is "-".
-     This is needed for -mAeExX3.  Using the file0 as
-     the common file would produce wrong results, because if the
-     file0-file1 diffs didn't line up with the file0-file2 diffs
-     (which is entirely possible since we don't use diff's -n option),
-     diff3 might report phantom changes from file1 to file2.  */
-
-  if (strcmp (file[2], "-") == 0)
-    {
-      /* Sigh.  We've got standard input as the last arg.  We can't
-	 call diff twice on stdin.  Use the middle arg as the common
-	 file instead.  */
-      if (strcmp (file[0], "-") == 0 || strcmp (file[1], "-") == 0)
-	fatal ("`-' specified for more than one input file");
-      mapping[0] = 0;
-      mapping[1] = 2;
-      mapping[2] = 1;
-    }
-  else
-    {
-      /* Normal, what you'd expect */
-      mapping[0] = 0;
-      mapping[1] = 1;
-      mapping[2] = 2;
-    }
-
-  for (i = 0; i < 3; i++)
-    rev_mapping[mapping[i]] = i;
-
-  for (i = 0; i < 3; i++)
-    if (strcmp (file[i], "-") != 0)
-      {
-	if (stat (file[i], &statb) < 0)
-	  perror_with_exit (file[i]);
-	else if (S_ISDIR(statb.st_mode))
-	  {
-	    fprintf (stderr, "%s: %s: Is a directory\n",
-		     program_name, file[i]);
-	    exit (2);
-	  }
-      }
-
-#if !defined(SIGCHLD) && defined(SIGCLD)
-#define SIGCHLD SIGCLD
-#endif
-#ifdef SIGCHLD
-  /* System V fork+wait does not work if SIGCHLD is ignored.  */
-  signal (SIGCHLD, SIG_DFL);
-#endif
-
-  commonname = file[rev_mapping[FILEC]];
-  thread1 = process_diff (file[rev_mapping[FILE1]], commonname, &last_block);
-  if (thread1)
-    for (i = 0; i < 2; i++)
-      {
-	horizon_lines = max (horizon_lines, D_NUMLINES (thread1, i));
-	horizon_lines = max (horizon_lines, D_NUMLINES (last_block, i));
-      }
-  thread0 = process_diff (file[rev_mapping[FILE0]], commonname, &last_block);
-  diff3 = make_3way_diff (thread0, thread1);
-  if (edscript)
-    conflicts_found
-      = output_diff3_edscript (stdout, diff3, mapping, rev_mapping,
-			       tag_strings[0], tag_strings[1], tag_strings[2]);
-  else if (merge)
-    {
-      if (! freopen (file[rev_mapping[FILE0]], "r", stdin))
-	perror_with_exit (file[rev_mapping[FILE0]]);
-      conflicts_found
-	= output_diff3_merge (stdin, stdout, diff3, mapping, rev_mapping,
-			      tag_strings[0], tag_strings[1], tag_strings[2]);
-      if (ferror (stdin))
-	fatal ("read error");
-    }
-  else
-    {
-      output_diff3 (stdout, diff3, mapping, rev_mapping);
-      conflicts_found = 0;
-    }
-
-  check_stdout ();
-  exit (conflicts_found);
-  return conflicts_found;
-}
-
-static void
-try_help (reason)
-     char const *reason;
-{
-  if (reason)
-    fprintf (stderr, "%s: %s\n", program_name, reason);
-  fprintf (stderr, "%s: Try `%s --help' for more information.\n",
-	   program_name, program_name);
-  exit (2);
-}
-
-static void
-check_stdout ()
-{
-  if (ferror (stdout) || fclose (stdout) != 0)
-    fatal ("write error");
-}
-
-/*
- * Explain, patiently and kindly, how to use this program.
- */
-static void
-usage ()
-{
-  printf ("Usage: %s [OPTION]... MYFILE OLDFILE YOURFILE\n\n", program_name);
-
-  printf ("%s", "\
-  -e  --ed  Output unmerged changes from OLDFILE to YOURFILE into MYFILE.\n\
-  -E  --show-overlap  Output unmerged changes, bracketing conflicts.\n\
-  -A  --show-all  Output all changes, bracketing conflicts.\n\
-  -x  --overlap-only  Output overlapping changes.\n\
-  -X  Output overlapping changes, bracketing them.\n\
-  -3  --easy-only  Output unmerged nonoverlapping changes.\n\n");
-  printf ("%s", "\
-  -m  --merge  Output merged file instead of ed script (default -A).\n\
-  -L LABEL  --label=LABEL  Use LABEL instead of file name.\n\
-  -i  Append `w' and `q' commands to ed scripts.\n\
-  -a  --text  Treat all files as text.\n\
-  -T  --initial-tab  Make tabs line up by prepending a tab.\n\n");
-  printf ("%s", "\
-  -v  --version  Output version info.\n\
-  --help  Output this help.\n\n");
-  printf ("If a FILE is `-', read standard input.\n");
-}
-
-/*
- * Routines that combine the two diffs together into one.  The
- * algorithm used follows:
- *
- *   File2 is shared in common between the two diffs.
- *   Diff02 is the diff between 0 and 2.
- *   Diff12 is the diff between 1 and 2.
- *
- *	1) Find the range for the first block in File2.
- *	    a) Take the lowest of the two ranges (in File2) in the two
- *	       current blocks (one from each diff) as being the low
- *	       water mark.  Assign the upper end of this block as
- *	       being the high water mark and move the current block up
- *	       one.  Mark the block just moved over as to be used.
- *	    b) Check the next block in the diff that the high water
- *	       mark is *not* from.
- *
- *	       *If* the high water mark is above
- *	       the low end of the range in that block,
- *
- *		   mark that block as to be used and move the current
- *		   block up.  Set the high water mark to the max of
- *		   the high end of this block and the current.  Repeat b.
- *
- *	 2) Find the corresponding ranges in File0 (from the blocks
- *	    in diff02; line per line outside of diffs) and in File1.
- *	    Create a diff3_block, reserving space as indicated by the ranges.
- *
- *	 3) Copy all of the pointers for file2 in.  At least for now,
- *	    do memcmp's between corresponding strings in the two diffs.
- *
- *	 4) Copy all of the pointers for file0 and 1 in.  Get what you
- *	    need from file2 (when there isn't a diff block, it's
- *	    identical to file2 within the range between diff blocks).
- *
- *	 5) If the diff blocks you used came from only one of the two
- *	    strings of diffs, then that file (i.e. the one other than
- *	    the common file in that diff) is the odd person out.  If you used
- *	    diff blocks from both sets, check to see if files 0 and 1 match:
- *
- *		Same number of lines?  If so, do a set of memcmp's (if a
- *	    memcmp matches; copy the pointer over; it'll be easier later
- *	    if you have to do any compares).  If they match, 0 & 1 are
- *	    the same.  If not, all three different.
- *
- *   Then you do it again, until you run out of blocks.
- *
- */
-
-/*
- * This routine makes a three way diff (chain of diff3_block's) from two
- * two way diffs (chains of diff_block's).  It is assumed that each of
- * the two diffs passed are onto the same file (i.e. that each of the
- * diffs were made "to" the same file).  The three way diff pointer
- * returned will have numbering FILE0--the other file in diff02,
- * FILE1--the other file in diff12, and FILEC--the common file.
- */
-static struct diff3_block *
-make_3way_diff (thread0, thread1)
-     struct diff_block *thread0, *thread1;
-{
-/*
- * This routine works on the two diffs passed to it as threads.
- * Thread number 0 is diff02, thread number 1 is diff12.  The USING
- * array is set to the base of the list of blocks to be used to
- * construct each block of the three way diff; if no blocks from a
- * particular thread are to be used, that element of the using array
- * is set to 0.  The elements LAST_USING array are set to the last
- * elements on each of the using lists.
- *
- * The HIGH_WATER_MARK is set to the highest line number in the common file
- * described in any of the diffs in either of the USING lists.  The
- * HIGH_WATER_THREAD names the thread.  Similarly the BASE_WATER_MARK
- * and BASE_WATER_THREAD describe the lowest line number in the common file
- * described in any of the diffs in either of the USING lists.  The
- * HIGH_WATER_DIFF is the diff from which the HIGH_WATER_MARK was
- * taken.
- *
- * The HIGH_WATER_DIFF should always be equal to LAST_USING
- * [HIGH_WATER_THREAD].  The OTHER_DIFF is the next diff to check for
- * higher water, and should always be equal to
- * CURRENT[HIGH_WATER_THREAD ^ 0x1].  The OTHER_THREAD is the thread
- * in which the OTHER_DIFF is, and hence should always be equal to
- * HIGH_WATER_THREAD ^ 0x1.
- *
- * The variable LAST_DIFF is kept set to the last diff block produced
- * by this routine, for line correspondence purposes between that diff
- * and the one currently being worked on.  It is initialized to
- * ZERO_DIFF before any blocks have been created.
- */
-
-  struct diff_block
-    *using[2],
-    *last_using[2],
-    *current[2];
-
-  int
-    high_water_mark;
-
-  int
-    high_water_thread,
-    base_water_thread,
-    other_thread;
-
-  struct diff_block
-    *high_water_diff,
-    *other_diff;
-
-  struct diff3_block
-    *result,
-    *tmpblock,
-    **result_end;
-
-  struct diff3_block const *last_diff3;
-
-  static struct diff3_block const zero_diff3;
-
-  /* Initialization */
-  result = 0;
-  result_end = &result;
-  current[0] = thread0; current[1] = thread1;
-  last_diff3 = &zero_diff3;
-
-  /* Sniff up the threads until we reach the end */
-
-  while (current[0] || current[1])
-    {
-      using[0] = using[1] = last_using[0] = last_using[1] = 0;
-
-      /* Setup low and high water threads, diffs, and marks.  */
-      if (!current[0])
-	base_water_thread = 1;
-      else if (!current[1])
-	base_water_thread = 0;
-      else
-	base_water_thread =
-	  (D_LOWLINE (current[0], FC) > D_LOWLINE (current[1], FC));
-
-      high_water_thread = base_water_thread;
-
-      high_water_diff = current[high_water_thread];
-
-#if 0
-      /* low and high waters start off same diff */
-      base_water_mark = D_LOWLINE (high_water_diff, FC);
-#endif
-
-      high_water_mark = D_HIGHLINE (high_water_diff, FC);
-
-      /* Make the diff you just got info from into the using class */
-      using[high_water_thread]
-	= last_using[high_water_thread]
-	= high_water_diff;
-      current[high_water_thread] = high_water_diff->next;
-      last_using[high_water_thread]->next = 0;
-
-      /* And mark the other diff */
-      other_thread = high_water_thread ^ 0x1;
-      other_diff = current[other_thread];
-
-      /* Shuffle up the ladder, checking the other diff to see if it
-	 needs to be incorporated.  */
-      while (other_diff
-	     && D_LOWLINE (other_diff, FC) <= high_water_mark + 1)
-	{
-
-	  /* Incorporate this diff into the using list.  Note that
-	     this doesn't take it off the current list */
-	  if (using[other_thread])
-	    last_using[other_thread]->next = other_diff;
-	  else
-	    using[other_thread] = other_diff;
-	  last_using[other_thread] = other_diff;
-
-	  /* Take it off the current list.  Note that this following
-	     code assumes that other_diff enters it equal to
-	     current[high_water_thread ^ 0x1] */
-	  current[other_thread] = current[other_thread]->next;
-	  other_diff->next = 0;
-
-	  /* Set the high_water stuff
-	     If this comparison is equal, then this is the last pass
-	     through this loop; since diff blocks within a given
-	     thread cannot overlap, the high_water_mark will be
-	     *below* the range_start of either of the next diffs.  */
-
-	  if (high_water_mark < D_HIGHLINE (other_diff, FC))
-	    {
-	      high_water_thread ^= 1;
-	      high_water_diff = other_diff;
-	      high_water_mark = D_HIGHLINE (other_diff, FC);
-	    }
-
-	  /* Set the other diff */
-	  other_thread = high_water_thread ^ 0x1;
-	  other_diff = current[other_thread];
-	}
-
-      /* The using lists contain a list of all of the blocks to be
-	 included in this diff3_block.  Create it.  */
-
-      tmpblock = using_to_diff3_block (using, last_using,
-				       base_water_thread, high_water_thread,
-				       last_diff3);
-
-      if (!tmpblock)
-	fatal ("internal error: screwup in format of diff blocks");
-
-      /* Put it on the list.  */
-      *result_end = tmpblock;
-      result_end = &tmpblock->next;
-
-      /* Set up corresponding lines correctly.  */
-      last_diff3 = tmpblock;
-    }
-  return result;
-}
-
-/*
- * using_to_diff3_block:
- *   This routine takes two lists of blocks (from two separate diff
- * threads) and puts them together into one diff3 block.
- * It then returns a pointer to this diff3 block or 0 for failure.
- *
- * All arguments besides using are for the convenience of the routine;
- * they could be derived from the using array.
- * LAST_USING is a pair of pointers to the last blocks in the using
- * structure.
- * LOW_THREAD and HIGH_THREAD tell which threads contain the lowest
- * and highest line numbers for File0.
- * last_diff3 contains the last diff produced in the calling routine.
- * This is used for lines mappings which would still be identical to
- * the state that diff ended in.
- *
- * A distinction should be made in this routine between the two diffs
- * that are part of a normal two diff block, and the three diffs that
- * are part of a diff3_block.
- */
-static struct diff3_block *
-using_to_diff3_block (using, last_using, low_thread, high_thread, last_diff3)
-     struct diff_block
-       *using[2],
-       *last_using[2];
-     int low_thread, high_thread;
-     struct diff3_block const *last_diff3;
-{
-  int low[2], high[2];
-  struct diff3_block *result;
-  struct diff_block *ptr;
-  int d, i;
-
-  /* Find the range in the common file.  */
-  int lowc = D_LOWLINE (using[low_thread], FC);
-  int highc = D_HIGHLINE (last_using[high_thread], FC);
-
-  /* Find the ranges in the other files.
-     If using[d] is null, that means that the file to which that diff
-     refers is equivalent to the common file over this range.  */
-
-  for (d = 0; d < 2; d++)
-    if (using[d])
-      {
-	low[d] = D_LOW_MAPLINE (using[d], FC, FO, lowc);
-	high[d] = D_HIGH_MAPLINE (last_using[d], FC, FO, highc);
-      }
-    else
-      {
-	low[d] = D_HIGH_MAPLINE (last_diff3, FILEC, FILE0 + d, lowc);
-	high[d] = D_HIGH_MAPLINE (last_diff3, FILEC, FILE0 + d, highc);
-      }
-
-  /* Create a block with the appropriate sizes */
-  result = create_diff3_block (low[0], high[0], low[1], high[1], lowc, highc);
-
-  /* Copy information for the common file.
-     Return with a zero if any of the compares failed.  */
-
-  for (d = 0; d < 2; d++)
-    for (ptr = using[d]; ptr; ptr = D_NEXT (ptr))
-      {
-	int result_offset = D_LOWLINE (ptr, FC) - lowc;
-
-	if (!copy_stringlist (D_LINEARRAY (ptr, FC),
-			      D_LENARRAY (ptr, FC),
-			      D_LINEARRAY (result, FILEC) + result_offset,
-			      D_LENARRAY (result, FILEC) + result_offset,
-			      D_NUMLINES (ptr, FC)))
-	  return 0;
-      }
-
-  /* Copy information for file d.  First deal with anything that might be
-     before the first diff.  */
-
-  for (d = 0; d < 2; d++)
-    {
-      struct diff_block *u = using[d];
-      int lo = low[d], hi = high[d];
-
-      for (i = 0;
-	   i + lo < (u ? D_LOWLINE (u, FO) : hi + 1);
-	   i++)
-	{
-	  D_RELNUM (result, FILE0 + d, i) = D_RELNUM (result, FILEC, i);
-	  D_RELLEN (result, FILE0 + d, i) = D_RELLEN (result, FILEC, i);
-	}
-
-      for (ptr = u; ptr; ptr = D_NEXT (ptr))
-	{
-	  int result_offset = D_LOWLINE (ptr, FO) - lo;
-	  int linec;
-
-	  if (!copy_stringlist (D_LINEARRAY (ptr, FO),
-				D_LENARRAY (ptr, FO),
-				D_LINEARRAY (result, FILE0 + d) + result_offset,
-				D_LENARRAY (result, FILE0 + d) + result_offset,
-				D_NUMLINES (ptr, FO)))
-	    return 0;
-
-	  /* Catch the lines between here and the next diff */
-	  linec = D_HIGHLINE (ptr, FC) + 1 - lowc;
-	  for (i = D_HIGHLINE (ptr, FO) + 1 - lo;
-	       i < (D_NEXT (ptr) ? D_LOWLINE (D_NEXT (ptr), FO) : hi + 1) - lo;
-	       i++)
-	    {
-	      D_RELNUM (result, FILE0 + d, i) = D_RELNUM (result, FILEC, linec);
-	      D_RELLEN (result, FILE0 + d, i) = D_RELLEN (result, FILEC, linec);
-	      linec++;
-	    }
-	}
-    }
-
-  /* Set correspond */
-  if (!using[0])
-    D3_TYPE (result) = DIFF_2ND;
-  else if (!using[1])
-    D3_TYPE (result) = DIFF_1ST;
-  else
-    {
-      int nl0 = D_NUMLINES (result, FILE0);
-      int nl1 = D_NUMLINES (result, FILE1);
-
-      if (nl0 != nl1
-	  || !compare_line_list (D_LINEARRAY (result, FILE0),
-				 D_LENARRAY (result, FILE0),
-				 D_LINEARRAY (result, FILE1),
-				 D_LENARRAY (result, FILE1),
-				 nl0))
-	D3_TYPE (result) = DIFF_ALL;
-      else
-	D3_TYPE (result) = DIFF_3RD;
-    }
-
-  return result;
-}
-
-/*
- * This routine copies pointers from a list of strings to a different list
- * of strings.  If a spot in the second list is already filled, it
- * makes sure that it is filled with the same string; if not it
- * returns 0, the copy incomplete.
- * Upon successful completion of the copy, it returns 1.
- */
-static int
-copy_stringlist (fromptrs, fromlengths, toptrs, tolengths, copynum)
-     char * const fromptrs[];
-     char *toptrs[];
-     size_t const fromlengths[];
-     size_t tolengths[];
-     int copynum;
-{
-  register char * const *f = fromptrs;
-  register char **t = toptrs;
-  register size_t const *fl = fromlengths;
-  register size_t *tl = tolengths;
-
-  while (copynum--)
-    {
-      if (*t)
-	{ if (*fl != *tl || memcmp (*f, *t, *fl)) return 0; }
-      else
-	{ *t = *f ; *tl = *fl; }
-
-      t++; f++; tl++; fl++;
-    }
-  return 1;
-}
-
-/*
- * Create a diff3_block, with ranges as specified in the arguments.
- * Allocate the arrays for the various pointers (and zero them) based
- * on the arguments passed.  Return the block as a result.
- */
-static struct diff3_block *
-create_diff3_block (low0, high0, low1, high1, low2, high2)
-     register int low0, high0, low1, high1, low2, high2;
-{
-  struct diff3_block *result = ALLOCATE (1, struct diff3_block);
-  int numlines;
-
-  D3_TYPE (result) = ERROR;
-  D_NEXT (result) = 0;
-
-  /* Assign ranges */
-  D_LOWLINE (result, FILE0) = low0;
-  D_HIGHLINE (result, FILE0) = high0;
-  D_LOWLINE (result, FILE1) = low1;
-  D_HIGHLINE (result, FILE1) = high1;
-  D_LOWLINE (result, FILE2) = low2;
-  D_HIGHLINE (result, FILE2) = high2;
-
-  /* Allocate and zero space */
-  numlines = D_NUMLINES (result, FILE0);
-  if (numlines)
-    {
-      D_LINEARRAY (result, FILE0) = ALLOCATE (numlines, char *);
-      D_LENARRAY (result, FILE0) = ALLOCATE (numlines, size_t);
-      bzero (D_LINEARRAY (result, FILE0), (numlines * sizeof (char *)));
-      bzero (D_LENARRAY (result, FILE0), (numlines * sizeof (size_t)));
-    }
-  else
-    {
-      D_LINEARRAY (result, FILE0) = 0;
-      D_LENARRAY (result, FILE0) = 0;
-    }
-
-  numlines = D_NUMLINES (result, FILE1);
-  if (numlines)
-    {
-      D_LINEARRAY (result, FILE1) = ALLOCATE (numlines, char *);
-      D_LENARRAY (result, FILE1) = ALLOCATE (numlines, size_t);
-      bzero (D_LINEARRAY (result, FILE1), (numlines * sizeof (char *)));
-      bzero (D_LENARRAY (result, FILE1), (numlines * sizeof (size_t)));
-    }
-  else
-    {
-      D_LINEARRAY (result, FILE1) = 0;
-      D_LENARRAY (result, FILE1) = 0;
-    }
-
-  numlines = D_NUMLINES (result, FILE2);
-  if (numlines)
-    {
-      D_LINEARRAY (result, FILE2) = ALLOCATE (numlines, char *);
-      D_LENARRAY (result, FILE2) = ALLOCATE (numlines, size_t);
-      bzero (D_LINEARRAY (result, FILE2), (numlines * sizeof (char *)));
-      bzero (D_LENARRAY (result, FILE2), (numlines * sizeof (size_t)));
-    }
-  else
-    {
-      D_LINEARRAY (result, FILE2) = 0;
-      D_LENARRAY (result, FILE2) = 0;
-    }
-
-  /* Return */
-  return result;
-}
-
-/*
- * Compare two lists of lines of text.
- * Return 1 if they are equivalent, 0 if not.
- */
-static int
-compare_line_list (list1, lengths1, list2, lengths2, nl)
-     char * const list1[], * const list2[];
-     size_t const lengths1[], lengths2[];
-     int nl;
-{
-  char
-    * const *l1 = list1,
-    * const *l2 = list2;
-  size_t const
-    *lgths1 = lengths1,
-    *lgths2 = lengths2;
-
-  while (nl--)
-    if (!*l1 || !*l2 || *lgths1 != *lgths2++
-	|| memcmp (*l1++, *l2++, *lgths1++))
-      return 0;
-  return 1;
-}
-
-/*
- * Routines to input and parse two way diffs.
- */
-
-extern char **environ;
-
-static struct diff_block *
-process_diff (filea, fileb, last_block)
-     char const *filea, *fileb;
-     struct diff_block **last_block;
-{
-  char *diff_contents;
-  char *diff_limit;
-  char *scan_diff;
-  enum diff_type dt;
-  int i;
-  struct diff_block *block_list, **block_list_end, *bptr;
-
-  diff_limit = read_diff (filea, fileb, &diff_contents);
-  scan_diff = diff_contents;
-  block_list_end = &block_list;
-  bptr = 0; /* Pacify `gcc -W'.  */
-
-  while (scan_diff < diff_limit)
-    {
-      bptr = ALLOCATE (1, struct diff_block);
-      bptr->lines[0] = bptr->lines[1] = 0;
-      bptr->lengths[0] = bptr->lengths[1] = 0;
-
-      dt = process_diff_control (&scan_diff, bptr);
-      if (dt == ERROR || *scan_diff != '\n')
-	{
-	  fprintf (stderr, "%s: diff error: ", program_name);
-	  do
-	    {
-	      putc (*scan_diff, stderr);
-	    }
-	  while (*scan_diff++ != '\n');
-	  exit (2);
-	}
-      scan_diff++;
-
-      /* Force appropriate ranges to be null, if necessary */
-      switch (dt)
-	{
-	case ADD:
-	  bptr->ranges[0][0]++;
-	  break;
-	case DELETE:
-	  bptr->ranges[1][0]++;
-	  break;
-	case CHANGE:
-	  break;
-	default:
-	  fatal ("internal error: invalid diff type in process_diff");
-	  break;
-	}
-
-      /* Allocate space for the pointers for the lines from filea, and
-	 parcel them out among these pointers */
-      if (dt != ADD)
-	{
-	  int numlines = D_NUMLINES (bptr, 0);
-	  bptr->lines[0] = ALLOCATE (numlines, char *);
-	  bptr->lengths[0] = ALLOCATE (numlines, size_t);
-	  for (i = 0; i < numlines; i++)
-	    scan_diff = scan_diff_line (scan_diff,
-					&(bptr->lines[0][i]),
-					&(bptr->lengths[0][i]),
-					diff_limit,
-					'<');
-	}
-
-      /* Get past the separator for changes */
-      if (dt == CHANGE)
-	{
-	  if (strncmp (scan_diff, "---\n", 4))
-	    fatal ("invalid diff format; invalid change separator");
-	  scan_diff += 4;
-	}
-
-      /* Allocate space for the pointers for the lines from fileb, and
-	 parcel them out among these pointers */
-      if (dt != DELETE)
-	{
-	  int numlines = D_NUMLINES (bptr, 1);
-	  bptr->lines[1] = ALLOCATE (numlines, char *);
-	  bptr->lengths[1] = ALLOCATE (numlines, size_t);
-	  for (i = 0; i < numlines; i++)
-	    scan_diff = scan_diff_line (scan_diff,
-					&(bptr->lines[1][i]),
-					&(bptr->lengths[1][i]),
-					diff_limit,
-					'>');
-	}
-
-      /* Place this block on the blocklist.  */
-      *block_list_end = bptr;
-      block_list_end = &bptr->next;
-    }
-
-  *block_list_end = 0;
-  *last_block = bptr;
-  return block_list;
-}
-
-/*
- * This routine will parse a normal format diff control string.  It
- * returns the type of the diff (ERROR if the format is bad).  All of
- * the other important information is filled into to the structure
- * pointed to by db, and the string pointer (whose location is passed
- * to this routine) is updated to point beyond the end of the string
- * parsed.  Note that only the ranges in the diff_block will be set by
- * this routine.
- *
- * If some specific pair of numbers has been reduced to a single
- * number, then both corresponding numbers in the diff block are set
- * to that number.  In general these numbers are interpetted as ranges
- * inclusive, unless being used by the ADD or DELETE commands.  It is
- * assumed that these will be special cased in a superior routine.
- */
-
-static enum diff_type
-process_diff_control (string, db)
-     char **string;
-     struct diff_block *db;
-{
-  char *s = *string;
-  int holdnum;
-  enum diff_type type;
-
-/* These macros are defined here because they can use variables
-   defined in this function.  Don't try this at home kids, we're
-   trained professionals!
-
-   Also note that SKIPWHITE only recognizes tabs and spaces, and
-   that READNUM can only read positive, integral numbers */
-
-#define	SKIPWHITE(s)	{ while (*s == ' ' || *s == '\t') s++; }
-#define	READNUM(s, num)	\
-	{ unsigned char c = *s; if (!ISDIGIT (c)) return ERROR; holdnum = 0; \
-	  do { holdnum = (c - '0' + holdnum * 10); }	\
-	  while (ISDIGIT (c = *++s)); (num) = holdnum; }
-
-  /* Read first set of digits */
-  SKIPWHITE (s);
-  READNUM (s, db->ranges[0][START]);
-
-  /* Was that the only digit? */
-  SKIPWHITE (s);
-  if (*s == ',')
-    {
-      /* Get the next digit */
-      s++;
-      READNUM (s, db->ranges[0][END]);
-    }
-  else
-    db->ranges[0][END] = db->ranges[0][START];
-
-  /* Get the letter */
-  SKIPWHITE (s);
-  switch (*s)
-    {
-    case 'a':
-      type = ADD;
-      break;
-    case 'c':
-      type = CHANGE;
-      break;
-    case 'd':
-      type = DELETE;
-      break;
-    default:
-      return ERROR;			/* Bad format */
-    }
-  s++;				/* Past letter */
-
-  /* Read second set of digits */
-  SKIPWHITE (s);
-  READNUM (s, db->ranges[1][START]);
-
-  /* Was that the only digit? */
-  SKIPWHITE (s);
-  if (*s == ',')
-    {
-      /* Get the next digit */
-      s++;
-      READNUM (s, db->ranges[1][END]);
-      SKIPWHITE (s);		/* To move to end */
-    }
-  else
-    db->ranges[1][END] = db->ranges[1][START];
-
-  *string = s;
-  return type;
-}
-
-static char *
-read_diff (filea, fileb, output_placement)
-     char const *filea, *fileb;
-     char **output_placement;
-{
-  char *diff_result;
-  size_t bytes, current_chunk_size, total;
-  int fd, wstatus;
-  struct stat pipestat;
-
-  /* 302 / 1000 is log10(2.0) rounded up.  Subtract 1 for the sign bit;
-     add 1 for integer division truncation; add 1 more for a minus sign.  */
-#define INT_STRLEN_BOUND(type) ((sizeof(type)*CHAR_BIT - 1) * 302 / 1000 + 2)
-
-#if HAVE_FORK
-
-  char const *argv[7];
-  char horizon_arg[17 + INT_STRLEN_BOUND (int)];
-  char const **ap;
-  int fds[2];
-  pid_t pid;
-
-  ap = argv;
-  *ap++ = diff_program;
-  if (always_text)
-    *ap++ = "-a";
-  sprintf (horizon_arg, "--horizon-lines=%d", horizon_lines);
-  *ap++ = horizon_arg;
-  *ap++ = "--";
-  *ap++ = filea;
-  *ap++ = fileb;
-  *ap = 0;
-
-  if (pipe (fds) != 0)
-    perror_with_exit ("pipe");
-
-  pid = vfork ();
-  if (pid == 0)
-    {
-      /* Child */
-      close (fds[0]);
-      if (fds[1] != STDOUT_FILENO)
-	{
-	  dup2 (fds[1], STDOUT_FILENO);
-	  close (fds[1]);
-	}
-      execve (diff_program, (char **) argv, environ);
-      /* Avoid stdio, because the parent process's buffers are inherited.  */
-      write (STDERR_FILENO, diff_program, strlen (diff_program));
-      write (STDERR_FILENO, ": not found\n", 12);
-      _exit (2);
-    }
-
-  if (pid == -1)
-    perror_with_exit ("fork failed");
-
-  close (fds[1]);		/* Prevent erroneous lack of EOF */
-  fd = fds[0];
-
-#else /* ! HAVE_FORK */
-
-  FILE *fpipe;
-  char *command = xmalloc (sizeof (diff_program) + 30 + INT_STRLEN_BOUND (int)
-			   + 4 * (strlen (filea) + strlen (fileb)));
-  char *p;
-  sprintf (command, "%s -a --horizon-lines=%d -- ",
-	   diff_program, horizon_lines);
-  p = command + strlen (command);
-  SYSTEM_QUOTE_ARG (p, filea);
-  *p++ = ' ';
-  SYSTEM_QUOTE_ARG (p, fileb);
-  *p = '\0';
-  fpipe = popen (command, "r");
-  if (!fpipe)
-    perror_with_exit (command);
-  free (command);
-  fd = fileno (fpipe);
-
-#endif /* ! HAVE_FORK */
-
-  current_chunk_size = 8 * 1024;
-  if (fstat (fd, &pipestat) == 0)
-    current_chunk_size = max (current_chunk_size, STAT_BLOCKSIZE (pipestat));
-
-  diff_result = xmalloc (current_chunk_size);
-  total = 0;
-  do {
-    bytes = myread (fd,
-		    diff_result + total,
-		    current_chunk_size - total);
-    total += bytes;
-    if (total == current_chunk_size)
-      {
-	if (current_chunk_size < 2 * current_chunk_size)
-	  current_chunk_size = 2 * current_chunk_size;
-	else if (current_chunk_size < (size_t) -1)
-	  current_chunk_size = (size_t) -1;
-	else
-	  fatal ("files are too large to fit into memory");
-	diff_result = xrealloc (diff_result, (current_chunk_size *= 2));
-      }
-  } while (bytes);
-
-  if (total != 0 && diff_result[total-1] != '\n')
-    fatal ("invalid diff format; incomplete last line");
-
-  *output_placement = diff_result;
-
-#if ! HAVE_FORK
-
-  wstatus = pclose (fpipe);
-
-#else /* HAVE_FORK */
-
-  if (close (fd) != 0)
-    perror_with_exit ("pipe close");
-  if (waitpid (pid, &wstatus, 0) < 0)
-    perror_with_exit ("waitpid failed");
-
-#endif /* HAVE_FORK */
-
-  if (! (WIFEXITED (wstatus) && WEXITSTATUS (wstatus) < 2))
-    fatal ("subsidiary diff failed");
-
-  return diff_result + total;
-}
-
-
-/*
- * Scan a regular diff line (consisting of > or <, followed by a
- * space, followed by text (including nulls) up to a newline.
- *
- * This next routine began life as a macro and many parameters in it
- * are used as call-by-reference values.
- */
-static char *
-scan_diff_line (scan_ptr, set_start, set_length, limit, leadingchar)
-     char *scan_ptr, **set_start;
-     size_t *set_length;
-     char *limit;
-     int leadingchar;
-{
-  char *line_ptr;
-
-  if (!(scan_ptr[0] == leadingchar
-	&& scan_ptr[1] == ' '))
-    fatal ("invalid diff format; incorrect leading line chars");
-
-  *set_start = line_ptr = scan_ptr + 2;
-  while (*line_ptr++ != '\n')
-    ;
-
-  /* Include newline if the original line ended in a newline,
-     or if an edit script is being generated.
-     Copy any missing newline message to stderr if an edit script is being
-     generated, because edit scripts cannot handle missing newlines.
-     Return the beginning of the next line.  */
-  *set_length = line_ptr - *set_start;
-  if (line_ptr < limit && *line_ptr == '\\')
-    {
-      if (edscript)
-	fprintf (stderr, "%s:", program_name);
-      else
-	--*set_length;
-      line_ptr++;
-      do
-	{
-	  if (edscript)
-	    putc (*line_ptr, stderr);
-	}
-      while (*line_ptr++ != '\n');
-    }
-
-  return line_ptr;
-}
-
-/*
- * This routine outputs a three way diff passed as a list of
- * diff3_block's.
- * The argument MAPPING is indexed by external file number (in the
- * argument list) and contains the internal file number (from the
- * diff passed).  This is important because the user expects his
- * outputs in terms of the argument list number, and the diff passed
- * may have been done slightly differently (if the last argument
- * was "-", for example).
- * REV_MAPPING is the inverse of MAPPING.
- */
-static void
-output_diff3 (outputfile, diff, mapping, rev_mapping)
-     FILE *outputfile;
-     struct diff3_block *diff;
-     int const mapping[3], rev_mapping[3];
-{
-  int i;
-  int oddoneout;
-  char *cp;
-  struct diff3_block *ptr;
-  int line;
-  size_t length;
-  int dontprint;
-  static int skew_increment[3] = { 2, 3, 1 }; /* 0==>2==>1==>3 */
-  char const *line_prefix = tab_align_flag ? "\t" : "  ";
-
-  for (ptr = diff; ptr; ptr = D_NEXT (ptr))
-    {
-      char x[2];
-
-      switch (ptr->correspond)
-	{
-	case DIFF_ALL:
-	  x[0] = '\0';
-	  dontprint = 3;	/* Print them all */
-	  oddoneout = 3;	/* Nobody's odder than anyone else */
-	  break;
-	case DIFF_1ST:
-	case DIFF_2ND:
-	case DIFF_3RD:
-	  oddoneout = rev_mapping[(int) ptr->correspond - (int) DIFF_1ST];
-
-	  x[0] = oddoneout + '1';
-	  x[1] = '\0';
-	  dontprint = oddoneout==0;
-	  break;
-	default:
-	  fatal ("internal error: invalid diff type passed to output");
-	}
-      fprintf (outputfile, "====%s\n", x);
-
-      /* Go 0, 2, 1 if the first and third outputs are equivalent.  */
-      for (i = 0; i < 3;
-	   i = (oddoneout == 1 ? skew_increment[i] : i + 1))
-	{
-	  int realfile = mapping[i];
-	  int
-	    lowt = D_LOWLINE (ptr, realfile),
-	    hight = D_HIGHLINE (ptr, realfile);
-
-	  fprintf (outputfile, "%d:", i + 1);
-	  switch (lowt - hight)
-	    {
-	    case 1:
-	      fprintf (outputfile, "%da\n", lowt - 1);
-	      break;
-	    case 0:
-	      fprintf (outputfile, "%dc\n", lowt);
-	      break;
-	    default:
-	      fprintf (outputfile, "%d,%dc\n", lowt, hight);
-	      break;
-	    }
-
-	  if (i == dontprint) continue;
-
-	  if (lowt <= hight)
-	    {
-	      line = 0;
-	      do
-		{
-		  fprintf (outputfile, line_prefix);
-		  cp = D_RELNUM (ptr, realfile, line);
-		  length = D_RELLEN (ptr, realfile, line);
-		  fwrite (cp, sizeof (char), length, outputfile);
-		}
-	      while (++line < hight - lowt + 1);
-	      if (cp[length - 1] != '\n')
-		fprintf (outputfile, "\n\\ No newline at end of file\n");
-	    }
-	}
-    }
-}
-
-
-/*
- * Output to OUTPUTFILE the lines of B taken from FILENUM.
- * Double any initial '.'s; yield nonzero if any initial '.'s were doubled.
- */
-static int
-dotlines (outputfile, b, filenum)
-     FILE *outputfile;
-     struct diff3_block *b;
-     int filenum;
-{
-  int i;
-  int leading_dot = 0;
-
-  for (i = 0;
-       i < D_NUMLINES (b, filenum);
-       i++)
-    {
-      char *line = D_RELNUM (b, filenum, i);
-      if (line[0] == '.')
-	{
-	  leading_dot = 1;
-	  fprintf (outputfile, ".");
-	}
-      fwrite (line, sizeof (char),
-	      D_RELLEN (b, filenum, i), outputfile);
-    }
-
-  return leading_dot;
-}
-
-/*
- * Output to OUTPUTFILE a '.' line.  If LEADING_DOT is nonzero,
- * also output a command that removes initial '.'s
- * starting with line START and continuing for NUM lines.
- */
-static void
-undotlines (outputfile, leading_dot, start, num)
-     FILE *outputfile;
-     int leading_dot, start, num;
-{
-  fprintf (outputfile, ".\n");
-  if (leading_dot)
-    if (num == 1)
-      fprintf (outputfile, "%ds/^\\.//\n", start);
-    else
-      fprintf (outputfile, "%d,%ds/^\\.//\n", start, start + num - 1);
-}
-
-/*
- * This routine outputs a diff3 set of blocks as an ed script.  This
- * script applies the changes between file's 2 & 3 to file 1.  It
- * takes the precise format of the ed script to be output from global
- * variables set during options processing.  Note that it does
- * destructive things to the set of diff3 blocks it is passed; it
- * reverses their order (this gets around the problems involved with
- * changing line numbers in an ed script).
- *
- * Note that this routine has the same problem of mapping as the last
- * one did; the variable MAPPING maps from file number according to
- * the argument list to file number according to the diff passed.  All
- * files listed below are in terms of the argument list.
- * REV_MAPPING is the inverse of MAPPING.
- *
- * The arguments FILE0, FILE1 and FILE2 are the strings to print
- * as the names of the three files.  These may be the actual names,
- * or may be the arguments specified with -L.
- *
- * Returns 1 if conflicts were found.
- */
-
-static int
-output_diff3_edscript (outputfile, diff, mapping, rev_mapping,
-		       file0, file1, file2)
-     FILE *outputfile;
-     struct diff3_block *diff;
-     int const mapping[3], rev_mapping[3];
-     char const *file0, *file1, *file2;
-{
-  int leading_dot;
-  int conflicts_found = 0, conflict;
-  struct diff3_block *b;
-
-  for (b = reverse_diff3_blocklist (diff); b; b = b->next)
-    {
-      /* Must do mapping correctly.  */
-      enum diff_type type
-	= ((b->correspond == DIFF_ALL) ?
-	   DIFF_ALL :
-	   ((enum diff_type)
-	    (((int) DIFF_1ST)
-	     + rev_mapping[(int) b->correspond - (int) DIFF_1ST])));
-
-      /* If we aren't supposed to do this output block, skip it.  */
-      switch (type)
-	{
-	default: continue;
-	case DIFF_2ND: if (!show_2nd) continue; conflict = 1; break;
-	case DIFF_3RD: if (overlap_only) continue; conflict = 0; break;
-	case DIFF_ALL: if (simple_only) continue; conflict = flagging; break;
-	}
-
-      if (conflict)
-	{
-	  conflicts_found = 1;
-
-
-	  /* Mark end of conflict.  */
-
-	  fprintf (outputfile, "%da\n", D_HIGHLINE (b, mapping[FILE0]));
-	  leading_dot = 0;
-	  if (type == DIFF_ALL)
-	    {
-	      if (show_2nd)
-		{
-		  /* Append lines from FILE1.  */
-		  fprintf (outputfile, "||||||| %s\n", file1);
-		  leading_dot = dotlines (outputfile, b, mapping[FILE1]);
-		}
-	      /* Append lines from FILE2.  */
-	      fprintf (outputfile, "=======\n");
-	      leading_dot |= dotlines (outputfile, b, mapping[FILE2]);
-	    }
-	  fprintf (outputfile, ">>>>>>> %s\n", file2);
-	  undotlines (outputfile, leading_dot,
-		      D_HIGHLINE (b, mapping[FILE0]) + 2,
-		      (D_NUMLINES (b, mapping[FILE1])
-		       + D_NUMLINES (b, mapping[FILE2]) + 1));
-
-
-	  /* Mark start of conflict.  */
-
-	  fprintf (outputfile, "%da\n<<<<<<< %s\n",
-		   D_LOWLINE (b, mapping[FILE0]) - 1,
-		   type == DIFF_ALL ? file0 : file1);
-	  leading_dot = 0;
-	  if (type == DIFF_2ND)
-	    {
-	      /* Prepend lines from FILE1.  */
-	      leading_dot = dotlines (outputfile, b, mapping[FILE1]);
-	      fprintf (outputfile, "=======\n");
-	    }
-	  undotlines (outputfile, leading_dot,
-		      D_LOWLINE (b, mapping[FILE0]) + 1,
-		      D_NUMLINES (b, mapping[FILE1]));
-	}
-      else if (D_NUMLINES (b, mapping[FILE2]) == 0)
-	/* Write out a delete */
-	{
-	  if (D_NUMLINES (b, mapping[FILE0]) == 1)
-	    fprintf (outputfile, "%dd\n",
-		     D_LOWLINE (b, mapping[FILE0]));
-	  else
-	    fprintf (outputfile, "%d,%dd\n",
-		     D_LOWLINE (b, mapping[FILE0]),
-		     D_HIGHLINE (b, mapping[FILE0]));
-	}
-      else
-	/* Write out an add or change */
-	{
-	  switch (D_NUMLINES (b, mapping[FILE0]))
-	    {
-	    case 0:
-	      fprintf (outputfile, "%da\n",
-		       D_HIGHLINE (b, mapping[FILE0]));
-	      break;
-	    case 1:
-	      fprintf (outputfile, "%dc\n",
-		       D_HIGHLINE (b, mapping[FILE0]));
-	      break;
-	    default:
-	      fprintf (outputfile, "%d,%dc\n",
-		       D_LOWLINE (b, mapping[FILE0]),
-		       D_HIGHLINE (b, mapping[FILE0]));
-	      break;
-	    }
-
-	  undotlines (outputfile, dotlines (outputfile, b, mapping[FILE2]),
-		      D_LOWLINE (b, mapping[FILE0]),
-		      D_NUMLINES (b, mapping[FILE2]));
-	}
-    }
-  if (finalwrite) fprintf (outputfile, "w\nq\n");
-  return conflicts_found;
-}
-
-/*
- * Read from INFILE and output to OUTPUTFILE a set of diff3_ blocks DIFF
- * as a merged file.  This acts like 'ed file0 <[output_diff3_edscript]',
- * except that it works even for binary data or incomplete lines.
- *
- * As before, MAPPING maps from arg list file number to diff file number,
- * REV_MAPPING is its inverse,
- * and FILE0, FILE1, and FILE2 are the names of the files.
- *
- * Returns 1 if conflicts were found.
- */
-
-static int
-output_diff3_merge (infile, outputfile, diff, mapping, rev_mapping,
-		    file0, file1, file2)
-     FILE *infile, *outputfile;
-     struct diff3_block *diff;
-     int const mapping[3], rev_mapping[3];
-     char const *file0, *file1, *file2;
-{
-  int c, i;
-  int conflicts_found = 0, conflict;
-  struct diff3_block *b;
-  int linesread = 0;
-
-  for (b = diff; b; b = b->next)
-    {
-      /* Must do mapping correctly.  */
-      enum diff_type type
-	= ((b->correspond == DIFF_ALL) ?
-	   DIFF_ALL :
-	   ((enum diff_type)
-	    (((int) DIFF_1ST)
-	     + rev_mapping[(int) b->correspond - (int) DIFF_1ST])));
-      char const *format_2nd = "<<<<<<< %s\n";
-
-      /* If we aren't supposed to do this output block, skip it.  */
-      switch (type)
-	{
-	default: continue;
-	case DIFF_2ND: if (!show_2nd) continue; conflict = 1; break;
-	case DIFF_3RD: if (overlap_only) continue; conflict = 0; break;
-	case DIFF_ALL: if (simple_only) continue; conflict = flagging;
-	  format_2nd = "||||||| %s\n";
-	  break;
-	}
-
-      /* Copy I lines from file 0.  */
-      i = D_LOWLINE (b, FILE0) - linesread - 1;
-      linesread += i;
-      while (0 <= --i)
-	do
-	  {
-	    c = getc (infile);
-	    if (c == EOF)
-	      if (ferror (infile))
-		perror_with_exit ("input file");
-	      else if (feof (infile))
-		fatal ("input file shrank");
-	    putc (c, outputfile);
-	  }
-	while (c != '\n');
-
-      if (conflict)
-	{
-	  conflicts_found = 1;
-
-	  if (type == DIFF_ALL)
-	    {
-	      /* Put in lines from FILE0 with bracket.  */
-	      fprintf (outputfile, "<<<<<<< %s\n", file0);
-	      for (i = 0;
-		   i < D_NUMLINES (b, mapping[FILE0]);
-		   i++)
-		fwrite (D_RELNUM (b, mapping[FILE0], i), sizeof (char),
-			D_RELLEN (b, mapping[FILE0], i), outputfile);
-	    }
-
-	  if (show_2nd)
-	    {
-	      /* Put in lines from FILE1 with bracket.  */
-	      fprintf (outputfile, format_2nd, file1);
-	      for (i = 0;
-		   i < D_NUMLINES (b, mapping[FILE1]);
-		   i++)
-		fwrite (D_RELNUM (b, mapping[FILE1], i), sizeof (char),
-			D_RELLEN (b, mapping[FILE1], i), outputfile);
-	    }
-
-	  fprintf (outputfile, "=======\n");
-	}
-
-      /* Put in lines from FILE2.  */
-      for (i = 0;
-	   i < D_NUMLINES (b, mapping[FILE2]);
-	   i++)
-	fwrite (D_RELNUM (b, mapping[FILE2], i), sizeof (char),
-		D_RELLEN (b, mapping[FILE2], i), outputfile);
-
-      if (conflict)
-	fprintf (outputfile, ">>>>>>> %s\n", file2);
-
-      /* Skip I lines in file 0.  */
-      i = D_NUMLINES (b, FILE0);
-      linesread += i;
-      while (0 <= --i)
-	while ((c = getc (infile)) != '\n')
-	  if (c == EOF)
-	    if (ferror (infile))
-	      perror_with_exit ("input file");
-	    else if (feof (infile))
-	      {
-		if (i || b->next)
-		  fatal ("input file shrank");
-		return conflicts_found;
-	      }
-    }
-  /* Copy rest of common file.  */
-  while ((c = getc (infile)) != EOF || !(ferror (infile) | feof (infile)))
-    putc (c, outputfile);
-  return conflicts_found;
-}
-
-/*
- * Reverse the order of the list of diff3 blocks.
- */
-static struct diff3_block *
-reverse_diff3_blocklist (diff)
-     struct diff3_block *diff;
-{
-  register struct diff3_block *tmp, *next, *prev;
-
-  for (tmp = diff, prev = 0;  tmp;  tmp = next)
-    {
-      next = tmp->next;
-      tmp->next = prev;
-      prev = tmp;
-    }
-
-  return prev;
-}
-
-static size_t
-myread (fd, ptr, size)
-     int fd;
-     char *ptr;
-     size_t size;
-{
-  size_t result = read (fd, ptr, size);
-  if (result == -1)
-    perror_with_exit ("read failed");
-  return result;
-}
-
-static VOID *
-xmalloc (size)
-     size_t size;
-{
-  VOID *result = (VOID *) malloc (size ? size : 1);
-  if (!result)
-    fatal ("memory exhausted");
-  return result;
-}
-
-static VOID *
-xrealloc (ptr, size)
-     VOID *ptr;
-     size_t size;
-{
-  VOID *result = (VOID *) realloc (ptr, size ? size : 1);
-  if (!result)
-    fatal ("memory exhausted");
-  return result;
-}
-
-static void
-fatal (string)
-     char const *string;
-{
-  fprintf (stderr, "%s: %s\n", program_name, string);
-  exit (2);
-}
-
-static void
-perror_with_exit (string)
-     char const *string;
-{
-  int e = errno;
-  fprintf (stderr, "%s: ", program_name);
-  errno = e;
-  perror (string);
-  exit (2);
-}
diff --git a/contrib/diff/dir.c b/contrib/diff/dir.c
deleted file mode 100644
index 036a86f..0000000
--- a/contrib/diff/dir.c
+++ /dev/null
@@ -1,216 +0,0 @@
-/* Read, sort and compare two directories.  Used for GNU DIFF.
-   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "diff.h"
-
-/* Read the directory named by DIR and store into DIRDATA a sorted vector
-   of filenames for its contents.  DIR->desc == -1 means this directory is
-   known to be nonexistent, so set DIRDATA to an empty vector.
-   Return -1 (setting errno) if error, 0 otherwise.  */
-
-struct dirdata
-{
-  char const **names;	/* Sorted names of files in dir, 0-terminated.  */
-  char *data;	/* Allocated storage for file names.  */
-};
-
-static int compare_names PARAMS((void const *, void const *));
-static int dir_sort PARAMS((struct file_data const *, struct dirdata *));
-
-static int
-dir_sort (dir, dirdata)
-     struct file_data const *dir;
-     struct dirdata *dirdata;
-{
-  register struct dirent *next;
-  register int i;
-
-  /* Address of block containing the files that are described.  */
-  char const **names;
-
-  /* Number of files in directory.  */
-  size_t nnames;
-
-  /* Allocated and used storage for file name data.  */
-  char *data;
-  size_t data_alloc, data_used;
-
-  dirdata->names = 0;
-  dirdata->data = 0;
-  nnames = 0;
-  data = 0;
-
-  if (dir->desc != -1)
-    {
-      /* Open the directory and check for errors.  */
-      register DIR *reading = opendir (dir->name);
-      if (!reading)
-	return -1;
-
-      /* Initialize the table of filenames.  */
-
-      data_alloc = max (1, (size_t) dir->stat.st_size);
-      data_used = 0;
-      dirdata->data = data = xmalloc (data_alloc);
-
-      /* Read the directory entries, and insert the subfiles
-	 into the `data' table.  */
-
-      while ((errno = 0, (next = readdir (reading)) != 0))
-	{
-	  char *d_name = next->d_name;
-	  size_t d_size = NAMLEN (next) + 1;
-
-	  /* Ignore the files `.' and `..' */
-	  if (d_name[0] == '.'
-	      && (d_name[1] == 0 || (d_name[1] == '.' && d_name[2] == 0)))
-	    continue;
-
-	  if (excluded_filename (d_name))
-	    continue;
-
-	  while (data_alloc < data_used + d_size)
-	    dirdata->data = data = xrealloc (data, data_alloc *= 2);
-	  memcpy (data + data_used, d_name, d_size);
-	  data_used += d_size;
-	  nnames++;
-	}
-      if (errno)
-	{
-	  int e = errno;
-	  closedir (reading);
-	  errno = e;
-	  return -1;
-	}
-#if CLOSEDIR_VOID
-      closedir (reading);
-#else
-      if (closedir (reading) != 0)
-	return -1;
-#endif
-    }
-
-  /* Create the `names' table from the `data' table.  */
-  dirdata->names = names = (char const **) xmalloc (sizeof (char *)
-						    * (nnames + 1));
-  for (i = 0;  i < nnames;  i++)
-    {
-      names[i] = data;
-      data += strlen (data) + 1;
-    }
-  names[nnames] = 0;
-
-  /* Sort the table.  */
-  qsort (names, nnames, sizeof (char *), compare_names);
-
-  return 0;
-}
-
-/* Sort the files now in the table.  */
-
-static int
-compare_names (file1, file2)
-     void const *file1, *file2;
-{
-  return filename_cmp (* (char const *const *) file1,
-		       * (char const *const *) file2);
-}
-
-/* Compare the contents of two directories named in FILEVEC[0] and FILEVEC[1].
-   This is a top-level routine; it does everything necessary for diff
-   on two directories.
-
-   FILEVEC[0].desc == -1 says directory FILEVEC[0] doesn't exist,
-   but pretend it is empty.  Likewise for FILEVEC[1].
-
-   HANDLE_FILE is a caller-provided subroutine called to handle each file.
-   It gets five operands: dir and name (rel to original working dir) of file
-   in dir 0, dir and name pathname of file in dir 1, and the recursion depth.
-
-   For a file that appears in only one of the dirs, one of the name-args
-   to HANDLE_FILE is zero.
-
-   DEPTH is the current depth in recursion, used for skipping top-level
-   files by the -S option.
-
-   Returns the maximum of all the values returned by HANDLE_FILE,
-   or 2 if trouble is encountered in opening files.  */
-
-int
-diff_dirs (filevec, handle_file, depth)
-     struct file_data const filevec[];
-     int (*handle_file) PARAMS((char const *, char const *, char const *, char const *, int));
-     int depth;
-{
-  struct dirdata dirdata[2];
-  int val = 0;			/* Return value.  */
-  int i;
-
-  /* Get sorted contents of both dirs.  */
-  for (i = 0; i < 2; i++)
-    if (dir_sort (&filevec[i], &dirdata[i]) != 0)
-      {
-	perror_with_name (filevec[i].name);
-	val = 2;
-      }
-
-  if (val == 0)
-    {
-      register char const * const *names0 = dirdata[0].names;
-      register char const * const *names1 = dirdata[1].names;
-      char const *name0 = filevec[0].name;
-      char const *name1 = filevec[1].name;
-
-      /* If `-S name' was given, and this is the topmost level of comparison,
-	 ignore all file names less than the specified starting name.  */
-
-      if (dir_start_file && depth == 0)
-	{
-	  while (*names0 && filename_cmp (*names0, dir_start_file) < 0)
-	    names0++;
-	  while (*names1 && filename_cmp (*names1, dir_start_file) < 0)
-	    names1++;
-	}
-
-      /* Loop while files remain in one or both dirs.  */
-      while (*names0 || *names1)
-	{
-	  /* Compare next name in dir 0 with next name in dir 1.
-	     At the end of a dir,
-	     pretend the "next name" in that dir is very large.  */
-	  int nameorder = (!*names0 ? 1 : !*names1 ? -1
-			   : filename_cmp (*names0, *names1));
-	  int v1 = (*handle_file) (name0, 0 < nameorder ? 0 : *names0++,
-				   name1, nameorder < 0 ? 0 : *names1++,
-				   depth + 1);
-	  if (v1 > val)
-	    val = v1;
-	}
-    }
-
-  for (i = 0; i < 2; i++)
-    {
-      if (dirdata[i].names)
-	free (dirdata[i].names);
-      if (dirdata[i].data)
-	free (dirdata[i].data);
-    }
-
-  return val;
-}
diff --git a/contrib/diff/ed.c b/contrib/diff/ed.c
deleted file mode 100644
index 717ef35..0000000
--- a/contrib/diff/ed.c
+++ /dev/null
@@ -1,200 +0,0 @@
-/* Output routines for ed-script format.
-   Copyright (C) 1988, 89, 91, 92, 93 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "diff.h"
-
-static void print_ed_hunk PARAMS((struct change *));
-static void print_rcs_hunk PARAMS((struct change *));
-static void pr_forward_ed_hunk PARAMS((struct change *));
-
-/* Print our script as ed commands.  */
-
-void
-print_ed_script (script)
-    struct change *script;
-{
-  print_script (script, find_reverse_change, print_ed_hunk);
-}
-
-/* Print a hunk of an ed diff */
-
-static void
-print_ed_hunk (hunk)
-     struct change *hunk; 
-{
-  int f0, l0, f1, l1;
-  int deletes, inserts;
-
-#if 0
-  hunk = flip_script (hunk);
-#endif
-#ifdef DEBUG
-  debug_script (hunk);
-#endif
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
-  if (!deletes && !inserts)
-    return;
-
-  begin_output ();
-
-  /* Print out the line number header for this hunk */
-  print_number_range (',', &files[0], f0, l0);
-  fprintf (outfile, "%c\n", change_letter (inserts, deletes));
-
-  /* Print new/changed lines from second file, if needed */
-  if (inserts)
-    {
-      int i;
-      int inserting = 1;
-      for (i = f1; i <= l1; i++)
-	{
-	  /* Resume the insert, if we stopped.  */
-	  if (! inserting)
-	    fprintf (outfile, "%da\n",
-		     i - f1 + translate_line_number (&files[0], f0) - 1);
-	  inserting = 1;
-
-	  /* If the file's line is just a dot, it would confuse `ed'.
-	     So output it with a double dot, and set the flag LEADING_DOT
-	     so that we will output another ed-command later
-	     to change the double dot into a single dot.  */
-
-	  if (files[1].linbuf[i][0] == '.'
-	      && files[1].linbuf[i][1] == '\n')
-	    {
-	      fprintf (outfile, "..\n");
-	      fprintf (outfile, ".\n");
-	      /* Now change that double dot to the desired single dot.  */
-	      fprintf (outfile, "%ds/^\\.\\././\n",
-		       i - f1 + translate_line_number (&files[0], f0));
-	      inserting = 0;
-	    }
-	  else
-	    /* Line is not `.', so output it unmodified.  */
-	    print_1_line ("", &files[1].linbuf[i]);
-	}
-
-      /* End insert mode, if we are still in it.  */
-      if (inserting)
-	fprintf (outfile, ".\n");
-    }
-}
-
-/* Print change script in the style of ed commands,
-   but print the changes in the order they appear in the input files,
-   which means that the commands are not truly useful with ed.  */
-
-void
-pr_forward_ed_script (script)
-     struct change *script;
-{
-  print_script (script, find_change, pr_forward_ed_hunk);
-}
-
-static void
-pr_forward_ed_hunk (hunk)
-     struct change *hunk;
-{
-  int i;
-  int f0, l0, f1, l1;
-  int deletes, inserts;
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
-  if (!deletes && !inserts)
-    return;
-
-  begin_output ();
-
-  fprintf (outfile, "%c", change_letter (inserts, deletes));
-  print_number_range (' ', files, f0, l0);
-  fprintf (outfile, "\n");
-
-  /* If deletion only, print just the number range.  */
-
-  if (!inserts)
-    return;
-
-  /* For insertion (with or without deletion), print the number range
-     and the lines from file 2.  */
-
-  for (i = f1; i <= l1; i++)
-    print_1_line ("", &files[1].linbuf[i]);
-
-  fprintf (outfile, ".\n");
-}
-
-/* Print in a format somewhat like ed commands
-   except that each insert command states the number of lines it inserts.
-   This format is used for RCS.  */
-
-void
-print_rcs_script (script)
-     struct change *script;
-{
-  print_script (script, find_change, print_rcs_hunk);
-}
-
-/* Print a hunk of an RCS diff */
-
-static void
-print_rcs_hunk (hunk)
-     struct change *hunk;
-{
-  int i;
-  int f0, l0, f1, l1;
-  int deletes, inserts;
-  int tf0, tl0, tf1, tl1;
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &f0, &l0, &f1, &l1, &deletes, &inserts);
-  if (!deletes && !inserts)
-    return;
-
-  begin_output ();
-
-  translate_range (&files[0], f0, l0, &tf0, &tl0);
-
-  if (deletes)
-    {
-      fprintf (outfile, "d");
-      /* For deletion, print just the starting line number from file 0
-	 and the number of lines deleted.  */
-      fprintf (outfile, "%d %d\n",
-	       tf0,
-	       (tl0 >= tf0 ? tl0 - tf0 + 1 : 1));	     
-    }
-
-  if (inserts)
-    {
-      fprintf (outfile, "a");
-
-      /* Take last-line-number from file 0 and # lines from file 1.  */
-      translate_range (&files[1], f1, l1, &tf1, &tl1);
-      fprintf (outfile, "%d %d\n",
-	       tl0,
-	       (tl1 >= tf1 ? tl1 - tf1 + 1 : 1));	     
-
-      /* Print the inserted lines.  */
-      for (i = f1; i <= l1; i++)
-	print_1_line ("", &files[1].linbuf[i]);
-    }
-}
diff --git a/contrib/diff/ifdef.c b/contrib/diff/ifdef.c
deleted file mode 100644
index 2834cbd..0000000
--- a/contrib/diff/ifdef.c
+++ /dev/null
@@ -1,428 +0,0 @@
-/* #ifdef-format output routines for GNU DIFF.
-   Copyright (C) 1989, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY.  No author or distributor
-accepts responsibility to anyone for the consequences of using it
-or for whether it serves any particular purpose or works at all,
-unless he says so in writing.  Refer to the GNU DIFF General Public
-License for full details.
-
-Everyone is granted permission to copy, modify and redistribute
-GNU DIFF, but only under the conditions described in the
-GNU DIFF General Public License.   A copy of this license is
-supposed to have been given to you along with GNU DIFF so you
-can know your rights and responsibilities.  It should be in a
-file named COPYING.  Among other things, the copyright notice
-and this notice must be preserved on all copies.  */
-
-
-#include "diff.h"
-
-struct group
-{
-  struct file_data const *file;
-  int from, upto; /* start and limit lines for this group of lines */
-};
-
-static char *format_group PARAMS((FILE *, char *, int, struct group const *));
-static char *scan_char_literal PARAMS((char *, int *));
-static char *scan_printf_spec PARAMS((char *));
-static int groups_letter_value PARAMS((struct group const *, int));
-static void format_ifdef PARAMS((char *, int, int, int, int));
-static void print_ifdef_hunk PARAMS((struct change *));
-static void print_ifdef_lines PARAMS((FILE *, char *, struct group const *));
-
-static int next_line;
-
-/* Print the edit-script SCRIPT as a merged #ifdef file.  */
-
-void
-print_ifdef_script (script)
-     struct change *script;
-{
-  next_line = - files[0].prefix_lines;
-  print_script (script, find_change, print_ifdef_hunk);
-  if (next_line < files[0].valid_lines)
-    {
-      begin_output ();
-      format_ifdef (group_format[UNCHANGED], next_line, files[0].valid_lines,
-		    next_line - files[0].valid_lines + files[1].valid_lines,
-		    files[1].valid_lines);
-    }
-}
-
-/* Print a hunk of an ifdef diff.
-   This is a contiguous portion of a complete edit script,
-   describing changes in consecutive lines.  */
-
-static void
-print_ifdef_hunk (hunk)
-     struct change *hunk;
-{
-  int first0, last0, first1, last1, deletes, inserts;
-  char *format;
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &first0, &last0, &first1, &last1, &deletes, &inserts);
-  if (inserts)
-    format = deletes ? group_format[CHANGED] : group_format[NEW];
-  else if (deletes)
-    format = group_format[OLD];
-  else
-    return;
-
-  begin_output ();
-
-  /* Print lines up to this change.  */
-  if (next_line < first0)
-    format_ifdef (group_format[UNCHANGED], next_line, first0,
-		  next_line - first0 + first1, first1);
-
-  /* Print this change.  */
-  next_line = last0 + 1;
-  format_ifdef (format, first0, next_line, first1, last1 + 1);
-}
-
-/* Print a set of lines according to FORMAT.
-   Lines BEG0 up to END0 are from the first file;
-   lines BEG1 up to END1 are from the second file.  */
-
-static void
-format_ifdef (format, beg0, end0, beg1, end1)
-     char *format;
-     int beg0, end0, beg1, end1;
-{
-  struct group groups[2];
-
-  groups[0].file = &files[0];
-  groups[0].from = beg0;
-  groups[0].upto = end0;
-  groups[1].file = &files[1];
-  groups[1].from = beg1;
-  groups[1].upto = end1;
-  format_group (outfile, format, '\0', groups);
-}
-
-/* Print to file OUT a set of lines according to FORMAT.
-   The format ends at the first free instance of ENDCHAR.
-   Yield the address of the terminating character.
-   GROUPS specifies which lines to print.
-   If OUT is zero, do not actually print anything; just scan the format.  */
-
-static char *
-format_group (out, format, endchar, groups)
-     register FILE *out;
-     char *format;
-     int endchar;
-     struct group const *groups;
-{
-  register char c;
-  register char *f = format;
-
-  while ((c = *f) != endchar && c != 0)
-    {
-      f++;
-      if (c == '%')
-	{
-	  char *spec = f;
-	  switch ((c = *f++))
-	    {
-	    case '%':
-	      break;
-
-	    case '(':
-	      /* Print if-then-else format e.g. `%(n=1?thenpart:elsepart)'.  */
-	      {
-		int i, value[2];
-		FILE *thenout, *elseout;
-
-		for (i = 0; i < 2; i++)
-		  {
-		    unsigned char f0 = f[0];
-		    if (ISDIGIT (f0))
-		      {
-			value[i] = atoi (f);
-			while (ISDIGIT ((unsigned char) *++f))
-			  continue;
-		      }
-		    else
-		      {
-			value[i] = groups_letter_value (groups, f0);
-			if (value[i] < 0)
-			  goto bad_format;
-			f++;
-		      }
-		    if (*f++ != "=?"[i])
-		      goto bad_format;
-		  }
-		if (value[0] == value[1])
-		  thenout = out, elseout = 0;
-		else
-		  thenout = 0, elseout = out;
-		f = format_group (thenout, f, ':', groups);
-		if (*f)
-		  {
-		    f = format_group (elseout, f + 1, ')', groups);
-		    if (*f)
-		      f++;
-		  }
-	      }
-	      continue;
-
-	    case '<':
-	      /* Print lines deleted from first file.  */
-	      print_ifdef_lines (out, line_format[OLD], &groups[0]);
-	      continue;
-
-	    case '=':
-	      /* Print common lines.  */
-	      print_ifdef_lines (out, line_format[UNCHANGED], &groups[0]);
-	      continue;
-
-	    case '>':
-	      /* Print lines inserted from second file.  */
-	      print_ifdef_lines (out, line_format[NEW], &groups[1]);
-	      continue;
-
-	    default:
-	      {
-		int value;
-		char *speclim;
-
-		f = scan_printf_spec (spec);
-		if (!f)
-		  goto bad_format;
-		speclim = f;
-		c = *f++;
-		switch (c)
-		  {
-		    case '\'':
-		      f = scan_char_literal (f, &value);
-		      if (!f)
-			goto bad_format;
-		      break;
-
-		    default:
-		      value = groups_letter_value (groups, c);
-		      if (value < 0)
-			goto bad_format;
-		      break;
-		  }
-		if (out)
-		  {
-		    /* Temporarily replace e.g. "%3dnx" with "%3d\0x".  */
-		    *speclim = 0;
-		    fprintf (out, spec - 1, value);
-		    /* Undo the temporary replacement.  */
-		    *speclim = c;
-		  }
-	      }
-	      continue;
-
-	    bad_format:
-	      c = '%';
-	      f = spec;
-	      break;
-	    }
-	}
-      if (out)
-	putc (c, out);
-    }
-  return f;
-}
-
-/* For the line group pair G, return the number corresponding to LETTER.
-   Return -1 if LETTER is not a group format letter.  */
-static int
-groups_letter_value (g, letter)
-     struct group const *g;
-     int letter;
-{
-  if (ISUPPER (letter))
-    {
-      g++;
-      letter = tolower (letter);
-    }
-  switch (letter)
-    {
-      case 'e': return translate_line_number (g->file, g->from) - 1;
-      case 'f': return translate_line_number (g->file, g->from);
-      case 'l': return translate_line_number (g->file, g->upto) - 1;
-      case 'm': return translate_line_number (g->file, g->upto);
-      case 'n': return g->upto - g->from;
-      default: return -1;
-    }
-}
-
-/* Print to file OUT, using FORMAT to print the line group GROUP.
-   But do nothing if OUT is zero.  */
-static void
-print_ifdef_lines (out, format, group)
-     register FILE *out;
-     char *format;
-     struct group const *group;
-{
-  struct file_data const *file = group->file;
-  char const * const *linbuf = file->linbuf;
-  int from = group->from, upto = group->upto;
-
-  if (!out)
-    return;
-
-  /* If possible, use a single fwrite; it's faster.  */
-  if (!tab_expand_flag && format[0] == '%')
-    {
-      if (format[1] == 'l' && format[2] == '\n' && !format[3])
-	{
-	  fwrite (linbuf[from], sizeof (char),
-		  linbuf[upto] + (linbuf[upto][-1] != '\n') -  linbuf[from],
-		  out);
-	  return;
-	}
-      if (format[1] == 'L' && !format[2])
-	{
-	  fwrite (linbuf[from], sizeof (char),
-		  linbuf[upto] -  linbuf[from], out);
-	  return;
-	}
-    }
-
-  for (;  from < upto;  from++)
-    {
-      register char c;
-      register char *f = format;
-
-      while ((c = *f++) != 0)
-	{
-	  if (c == '%')
-	    {
-	      char *spec = f;
-	      switch ((c = *f++))
-		{
-		case '%':
-		  break;
-
-		case 'l':
-		  output_1_line (linbuf[from],
-				 linbuf[from + 1]
-				   - (linbuf[from + 1][-1] == '\n'), 0, 0);
-		  continue;
-
-		case 'L':
-		  output_1_line (linbuf[from], linbuf[from + 1], 0, 0);
-		  continue;
-
-		default:
-		  {
-		    int value;
-		    char *speclim;
-
-		    f = scan_printf_spec (spec);
-		    if (!f)
-		      goto bad_format;
-		    speclim = f;
-		    c = *f++;
-		    switch (c)
-		      {
-			case '\'':
-			  f = scan_char_literal (f, &value);
-			  if (!f)
-			    goto bad_format;
-			  break;
-
-			case 'n':
-			  value = translate_line_number (file, from);
-			  break;
-
-			default:
-			  goto bad_format;
-		      }
-		    /* Temporarily replace e.g. "%3dnx" with "%3d\0x".  */
-		    *speclim = 0;
-		    fprintf (out, spec - 1, value);
-		    /* Undo the temporary replacement.  */
-		    *speclim = c;
-		  }
-		  continue;
-
-		bad_format:
-		  c = '%';
-		  f = spec;
-		  break;
-		}
-	    }
-	  putc (c, out);
-	}
-    }
-}
-
-/* Scan the character literal represented in the string LIT; LIT points just
-   after the initial apostrophe.  Put the literal's value into *INTPTR.
-   Yield the address of the first character after the closing apostrophe,
-   or zero if the literal is ill-formed.  */
-static char *
-scan_char_literal (lit, intptr)
-     char *lit;
-     int *intptr;
-{
-  register char *p = lit;
-  int value, digits;
-  char c = *p++;
-
-  switch (c)
-    {
-      case 0:
-      case '\'':
-	return 0;
-
-      case '\\':
-	value = 0;
-	while ((c = *p++) != '\'')
-	  {
-	    unsigned digit = c - '0';
-	    if (8 <= digit)
-	      return 0;
-	    value = 8 * value + digit;
-	  }
-	digits = p - lit - 2;
-	if (! (1 <= digits && digits <= 3))
-	  return 0;
-	break;
-
-      default:
-	value = c;
-	if (*p++ != '\'')
-	  return 0;
-	break;
-    }
-  *intptr = value;
-  return p;
-}
-
-/* Scan optional printf-style SPEC of the form `-*[0-9]*(.[0-9]*)?[cdoxX]'.
-   Return the address of the character following SPEC, or zero if failure.  */
-static char *
-scan_printf_spec (spec)
-     register char *spec;
-{
-  register unsigned char c;
-
-  while ((c = *spec++) == '-')
-    continue;
-  while (ISDIGIT (c))
-    c = *spec++;
-  if (c == '.')
-    while (ISDIGIT (c = *spec++))
-      continue;
-  switch (c)
-    {
-      case 'c': case 'd': case 'o': case 'x': case 'X':
-	return spec;
-
-      default:
-	return 0;
-    }
-}
diff --git a/contrib/diff/install-sh b/contrib/diff/install-sh
deleted file mode 100755
index ab74c88..0000000
--- a/contrib/diff/install-sh
+++ /dev/null
@@ -1,238 +0,0 @@
-#!/bin/sh
-#
-# install - install a program, script, or datafile
-# This comes from X11R5.
-#
-# Calling this script install-sh is preferred over install.sh, to prevent
-# `make' implicit rules from creating a file called install from it
-# when there is no Makefile.
-#
-# This script is compatible with the BSD install script, but was written
-# from scratch.
-#
-
-
-# set DOITPROG to echo to test this script
-
-# Don't use :- since 4.3BSD and earlier shells don't like it.
-doit="${DOITPROG-}"
-
-
-# put in absolute paths if you don't have them in your path; or use env. vars.
-
-mvprog="${MVPROG-mv}"
-cpprog="${CPPROG-cp}"
-chmodprog="${CHMODPROG-chmod}"
-chownprog="${CHOWNPROG-chown}"
-chgrpprog="${CHGRPPROG-chgrp}"
-stripprog="${STRIPPROG-strip}"
-rmprog="${RMPROG-rm}"
-mkdirprog="${MKDIRPROG-mkdir}"
-
-tranformbasename=""
-transform_arg=""
-instcmd="$mvprog"
-chmodcmd="$chmodprog 0755"
-chowncmd=""
-chgrpcmd=""
-stripcmd=""
-rmcmd="$rmprog -f"
-mvcmd="$mvprog"
-src=""
-dst=""
-dir_arg=""
-
-while [ x"$1" != x ]; do
-    case $1 in
-	-c) instcmd="$cpprog"
-	    shift
-	    continue;;
-
-	-d) dir_arg=true
-	    shift
-	    continue;;
-
-	-m) chmodcmd="$chmodprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-o) chowncmd="$chownprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-g) chgrpcmd="$chgrpprog $2"
-	    shift
-	    shift
-	    continue;;
-
-	-s) stripcmd="$stripprog"
-	    shift
-	    continue;;
-
-	-t=*) transformarg=`echo $1 | sed 's/-t=//'`
-	    shift
-	    continue;;
-
-	-b=*) transformbasename=`echo $1 | sed 's/-b=//'`
-	    shift
-	    continue;;
-
-	*)  if [ x"$src" = x ]
-	    then
-		src=$1
-	    else
-		# this colon is to work around a 386BSD /bin/sh bug
-		:
-		dst=$1
-	    fi
-	    shift
-	    continue;;
-    esac
-done
-
-if [ x"$src" = x ]
-then
-	echo "install:	no input file specified"
-	exit 1
-else
-	true
-fi
-
-if [ x"$dir_arg" != x ]; then
-	dst=$src
-	src=""
-	
-	if [ -d $dst ]; then
-		instcmd=:
-	else
-		instcmd=mkdir
-	fi
-else
-
-# Waiting for this to be detected by the "$instcmd $src $dsttmp" command
-# might cause directories to be created, which would be especially bad 
-# if $src (and thus $dsttmp) contains '*'.
-
-	if [ -f $src -o -d $src ]
-	then
-		true
-	else
-		echo "install:  $src does not exist"
-		exit 1
-	fi
-	
-	if [ x"$dst" = x ]
-	then
-		echo "install:	no destination specified"
-		exit 1
-	else
-		true
-	fi
-
-# If destination is a directory, append the input filename; if your system
-# does not like double slashes in filenames, you may need to add some logic
-
-	if [ -d $dst ]
-	then
-		dst="$dst"/`basename $src`
-	else
-		true
-	fi
-fi
-
-## this sed command emulates the dirname command
-dstdir=`echo $dst | sed -e 's,[^/]*$,,;s,/$,,;s,^$,.,'`
-
-# Make sure that the destination directory exists.
-#  this part is taken from Noah Friedman's mkinstalldirs script
-
-# Skip lots of stat calls in the usual case.
-if [ ! -d "$dstdir" ]; then
-defaultIFS='	
-'
-IFS="${IFS-${defaultIFS}}"
-
-oIFS="${IFS}"
-# Some sh's can't handle IFS=/ for some reason.
-IFS='%'
-set - `echo ${dstdir} | sed -e 's@/@%@g' -e 's@^%@/@'`
-IFS="${oIFS}"
-
-pathcomp=''
-
-while [ $# -ne 0 ] ; do
-	pathcomp="${pathcomp}${1}"
-	shift
-
-	if [ ! -d "${pathcomp}" ] ;
-        then
-		$mkdirprog "${pathcomp}"
-	else
-		true
-	fi
-
-	pathcomp="${pathcomp}/"
-done
-fi
-
-if [ x"$dir_arg" != x ]
-then
-	$doit $instcmd $dst &&
-
-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dst; else true ; fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dst; else true ; fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dst; else true ; fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dst; else true ; fi
-else
-
-# If we're going to rename the final executable, determine the name now.
-
-	if [ x"$transformarg" = x ] 
-	then
-		dstfile=`basename $dst`
-	else
-		dstfile=`basename $dst $transformbasename | 
-			sed $transformarg`$transformbasename
-	fi
-
-# don't allow the sed command to completely eliminate the filename
-
-	if [ x"$dstfile" = x ] 
-	then
-		dstfile=`basename $dst`
-	else
-		true
-	fi
-
-# Make a temp file name in the proper directory.
-
-	dsttmp=$dstdir/#inst.$$#
-
-# Move or copy the file name to the temp name
-
-	$doit $instcmd $src $dsttmp &&
-
-	trap "rm -f ${dsttmp}" 0 &&
-
-# and set any options; do chmod last to preserve setuid bits
-
-# If any of these fail, we abort the whole thing.  If we want to
-# ignore errors from any of these, just make sure not to ignore
-# errors from the above "$doit $instcmd $src $dsttmp" command.
-
-	if [ x"$chowncmd" != x ]; then $doit $chowncmd $dsttmp; else true;fi &&
-	if [ x"$chgrpcmd" != x ]; then $doit $chgrpcmd $dsttmp; else true;fi &&
-	if [ x"$stripcmd" != x ]; then $doit $stripcmd $dsttmp; else true;fi &&
-	if [ x"$chmodcmd" != x ]; then $doit $chmodcmd $dsttmp; else true;fi &&
-
-# Now rename the file to the real destination.
-
-	$doit $rmcmd -f $dstdir/$dstfile &&
-	$doit $mvcmd $dsttmp $dstdir/$dstfile 
-
-fi &&
-
-
-exit 0
diff --git a/contrib/diff/io.c b/contrib/diff/io.c
deleted file mode 100644
index 6605915..0000000
--- a/contrib/diff/io.c
+++ /dev/null
@@ -1,714 +0,0 @@
-/* File I/O for GNU DIFF.
-   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#include "diff.h"
-
-/* Rotate a value n bits to the left. */
-#define UINT_BIT (sizeof (unsigned) * CHAR_BIT)
-#define ROL(v, n) ((v) << (n) | (v) >> (UINT_BIT - (n)))
-
-/* Given a hash value and a new character, return a new hash value. */
-#define HASH(h, c) ((c) + ROL (h, 7))
-
-/* Guess remaining number of lines from number N of lines so far,
-   size S so far, and total size T.  */
-#define GUESS_LINES(n,s,t) (((t) - (s)) / ((n) < 10 ? 32 : (s) / ((n)-1)) + 5)
-
-/* Type used for fast prefix comparison in find_identical_ends.  */
-#ifndef word
-#define word int
-#endif
-
-/* Lines are put into equivalence classes (of lines that match in line_cmp).
-   Each equivalence class is represented by one of these structures,
-   but only while the classes are being computed.
-   Afterward, each class is represented by a number.  */
-struct equivclass
-{
-  int next;	/* Next item in this bucket. */
-  unsigned hash;	/* Hash of lines in this class.  */
-  char const *line;	/* A line that fits this class. */
-  size_t length;	/* That line's length, not counting its newline.  */
-};
-
-/* Hash-table: array of buckets, each being a chain of equivalence classes.
-   buckets[-1] is reserved for incomplete lines.  */
-static int *buckets;
-
-/* Number of buckets in the hash table array, not counting buckets[-1]. */
-static int nbuckets;
-
-/* Array in which the equivalence classes are allocated.
-   The bucket-chains go through the elements in this array.
-   The number of an equivalence class is its index in this array.  */
-static struct equivclass *equivs;
-
-/* Index of first free element in the array `equivs'.  */
-static int equivs_index;
-
-/* Number of elements allocated in the array `equivs'.  */
-static int equivs_alloc;
-
-static void find_and_hash_each_line PARAMS((struct file_data *));
-static void find_identical_ends PARAMS((struct file_data[]));
-static void prepare_text_end PARAMS((struct file_data *));
-
-/* Check for binary files and compare them for exact identity.  */
-
-/* Return 1 if BUF contains a non text character.
-   SIZE is the number of characters in BUF.  */
-
-#define binary_file_p(buf, size) (memchr (buf, '\0', size) != 0)
-
-/* Get ready to read the current file.
-   Return nonzero if SKIP_TEST is zero,
-   and if it appears to be a binary file.  */
-
-int
-sip (current, skip_test)
-     struct file_data *current;
-     int skip_test;
-{
-  /* If we have a nonexistent file at this stage, treat it as empty.  */
-  if (current->desc < 0)
-    {
-      /* Leave room for a sentinel.  */
-      current->bufsize = sizeof (word);
-      current->buffer = xmalloc (current->bufsize);
-    }
-  else
-    {
-      current->bufsize = STAT_BLOCKSIZE (current->stat);
-      current->buffer = xmalloc (current->bufsize);
-
-      if (! skip_test)
-	{
-	  /* Check first part of file to see if it's a binary file.  */
-#if HAVE_SETMODE
-	  int oldmode = setmode (current->desc, O_BINARY);
-#endif
-	  size_t n = read (current->desc, current->buffer, current->bufsize);
-	  if (n == -1)
-	    pfatal_with_name (current->name);
-	  current->buffered_chars = n;
-#if HAVE_SETMODE
-	  if (oldmode != O_BINARY)
-	    {
-	      if (lseek (current->desc, - (off_t) n, SEEK_CUR) == -1)
-		pfatal_with_name (current->name);
-	      setmode (current->desc, oldmode);
-	      current->buffered_chars = 0;
-	    }
-#endif
-	  return binary_file_p (current->buffer, n);
-	}
-    }
-
-  current->buffered_chars = 0;
-  return 0;
-}
-
-/* Slurp the rest of the current file completely into memory.  */
-
-void
-slurp (current)
-     struct file_data *current;
-{
-  size_t cc;
-
-  if (current->desc < 0)
-    /* The file is nonexistent.  */
-    ;
-  else if (S_ISREG (current->stat.st_mode))
-    {
-      /* It's a regular file; slurp in the rest all at once.  */
-
-      /* Get the size out of the stat block.
-	 Allocate enough room for appended newline and sentinel.  */
-      cc = current->stat.st_size + 1 + sizeof (word);
-      if (current->bufsize < cc)
-	{
-	  current->bufsize = cc;
-	  current->buffer = xrealloc (current->buffer, cc);
-	}
-
-      if (current->buffered_chars < current->stat.st_size)
-	{
-	  cc = read (current->desc,
-		     current->buffer + current->buffered_chars,
-		     current->stat.st_size - current->buffered_chars);
-	  if (cc == -1)
-	    pfatal_with_name (current->name);
-	  current->buffered_chars += cc;
-	}
-    }
-  /* It's not a regular file; read it, growing the buffer as needed.  */
-  else if (always_text_flag || current->buffered_chars != 0)
-    {
-      for (;;)
-	{
-	  if (current->buffered_chars == current->bufsize)
-	    {
-	      current->bufsize = current->bufsize * 2;
-	      current->buffer = xrealloc (current->buffer, current->bufsize);
-	    }
-	  cc = read (current->desc,
-		     current->buffer + current->buffered_chars,
-		     current->bufsize - current->buffered_chars);
-	  if (cc == 0)
-	    break;
-	  if (cc == -1)
-	    pfatal_with_name (current->name);
-	  current->buffered_chars += cc;
-	}
-      /* Allocate just enough room for appended newline and sentinel.  */
-      current->bufsize = current->buffered_chars + 1 + sizeof (word);
-      current->buffer = xrealloc (current->buffer, current->bufsize);
-    }
-}
-
-/* Split the file into lines, simultaneously computing the equivalence class for
-   each line. */
-
-static void
-find_and_hash_each_line (current)
-     struct file_data *current;
-{
-  unsigned h;
-  unsigned char const *p = (unsigned char const *) current->prefix_end;
-  unsigned char c;
-  int i, *bucket;
-  size_t length;
-
-  /* Cache often-used quantities in local variables to help the compiler.  */
-  char const **linbuf = current->linbuf;
-  int alloc_lines = current->alloc_lines;
-  int line = 0;
-  int linbuf_base = current->linbuf_base;
-  int *cureqs = (int *) xmalloc (alloc_lines * sizeof (int));
-  struct equivclass *eqs = equivs;
-  int eqs_index = equivs_index;
-  int eqs_alloc = equivs_alloc;
-  char const *suffix_begin = current->suffix_begin;
-  char const *bufend = current->buffer + current->buffered_chars;
-  int use_line_cmp = ignore_some_line_changes;
-
-  while ((char const *) p < suffix_begin)
-    {
-      char const *ip = (char const *) p;
-
-      /* Compute the equivalence class for this line.  */
-
-      h = 0;
-
-      /* Hash this line until we find a newline. */
-      if (ignore_case_flag)
-	{
-	  if (ignore_all_space_flag)
-	    while ((c = *p++) != '\n')
-	      {
-		if (! ISSPACE (c))
-		  h = HASH (h, ISUPPER (c) ? tolower (c) : c);
-	      }
-	  else if (ignore_space_change_flag)
-	    while ((c = *p++) != '\n')
-	      {
-		if (ISSPACE (c))
-		  {
-		    for (;;)
-		      {
-			c = *p++;
-			if (!ISSPACE (c))
-			  break;
-			if (c == '\n')
-			  goto hashing_done;
-		      }
-		    h = HASH (h, ' ');
-		  }
-		/* C is now the first non-space.  */
-		h = HASH (h, ISUPPER (c) ? tolower (c) : c);
-	      }
-	  else
-	    while ((c = *p++) != '\n')
-	      h = HASH (h, ISUPPER (c) ? tolower (c) : c);
-	}
-      else
-	{
-	  if (ignore_all_space_flag)
-	    while ((c = *p++) != '\n')
-	      {
-		if (! ISSPACE (c))
-		  h = HASH (h, c);
-	      }
-	  else if (ignore_space_change_flag)
-	    while ((c = *p++) != '\n')
-	      {
-		if (ISSPACE (c))
-		  {
-		    for (;;)
-		      {
-			c = *p++;
-			if (!ISSPACE (c))
-			  break;
-			if (c == '\n')
-			  goto hashing_done;
-		      }
-		    h = HASH (h, ' ');
-		  }
-		/* C is now the first non-space.  */
-		h = HASH (h, c);
-	      }
-	  else
-	    while ((c = *p++) != '\n')
-	      h = HASH (h, c);
-	}
-   hashing_done:;
-
-      bucket = &buckets[h % nbuckets];
-      length = (char const *) p - ip - 1;
-
-      if ((char const *) p == bufend
-	  && current->missing_newline
-	  && ROBUST_OUTPUT_STYLE (output_style))
-	{
-	  /* This line is incomplete.  If this is significant,
-	     put the line into bucket[-1].  */
-	  if (! (ignore_space_change_flag | ignore_all_space_flag))
-	    bucket = &buckets[-1];
-
-	  /* Omit the inserted newline when computing linbuf later.  */
-	  p--;
-	  bufend = suffix_begin = (char const *) p;
-	}
-
-      for (i = *bucket;  ;  i = eqs[i].next)
-	if (!i)
-	  {
-	    /* Create a new equivalence class in this bucket. */
-	    i = eqs_index++;
-	    if (i == eqs_alloc)
-	      eqs = (struct equivclass *)
-		      xrealloc (eqs, (eqs_alloc*=2) * sizeof(*eqs));
-	    eqs[i].next = *bucket;
-	    eqs[i].hash = h;
-	    eqs[i].line = ip;
-	    eqs[i].length = length;
-	    *bucket = i;
-	    break;
-	  }
-	else if (eqs[i].hash == h)
-	  {
-	    char const *eqline = eqs[i].line;
-
-	    /* Reuse existing equivalence class if the lines are identical.
-	       This detects the common case of exact identity
-	       faster than complete comparison would.  */
-	    if (eqs[i].length == length && memcmp (eqline, ip, length) == 0)
-	      break;
-
-	    /* Reuse existing class if line_cmp reports the lines equal.  */
-	    if (use_line_cmp && line_cmp (eqline, ip) == 0)
-	      break;
-	  }
-
-      /* Maybe increase the size of the line table. */
-      if (line == alloc_lines)
-	{
-	  /* Double (alloc_lines - linbuf_base) by adding to alloc_lines.  */
-	  alloc_lines = 2 * alloc_lines - linbuf_base;
-	  cureqs = (int *) xrealloc (cureqs, alloc_lines * sizeof (*cureqs));
-	  linbuf = (char const **) xrealloc (linbuf + linbuf_base,
-					     (alloc_lines - linbuf_base)
-					     * sizeof (*linbuf))
-		   - linbuf_base;
-	}
-      linbuf[line] = ip;
-      cureqs[line] = i;
-      ++line;
-    }
-
-  current->buffered_lines = line;
-
-  for (i = 0;  ;  i++)
-    {
-      /* Record the line start for lines in the suffix that we care about.
-	 Record one more line start than lines,
-	 so that we can compute the length of any buffered line.  */
-      if (line == alloc_lines)
-	{
-	  /* Double (alloc_lines - linbuf_base) by adding to alloc_lines.  */
-	  alloc_lines = 2 * alloc_lines - linbuf_base;
-	  linbuf = (char const **) xrealloc (linbuf + linbuf_base,
-					     (alloc_lines - linbuf_base)
-					     * sizeof (*linbuf))
-		   - linbuf_base;
-	}
-      linbuf[line] = (char const *) p;
-
-      if ((char const *) p == bufend)
-	break;
-
-      if (context <= i && no_diff_means_no_output)
-	break;
-
-      line++;
-
-      while (*p++ != '\n')
-	;
-    }
-
-  /* Done with cache in local variables.  */
-  current->linbuf = linbuf;
-  current->valid_lines = line;
-  current->alloc_lines = alloc_lines;
-  current->equivs = cureqs;
-  equivs = eqs;
-  equivs_alloc = eqs_alloc;
-  equivs_index = eqs_index;
-}
-
-/* Prepare the end of the text.  Make sure it's initialized.
-   Make sure text ends in a newline,
-   but remember that we had to add one.  */
-
-static void
-prepare_text_end (current)
-     struct file_data *current;
-{
-  size_t buffered_chars = current->buffered_chars;
-  char *p = current->buffer;
-
-  if (buffered_chars == 0 || p[buffered_chars - 1] == '\n')
-    current->missing_newline = 0;
-  else
-    {
-      p[buffered_chars++] = '\n';
-      current->buffered_chars = buffered_chars;
-      current->missing_newline = 1;
-    }
-
-  /* Don't use uninitialized storage when planting or using sentinels.  */
-  if (p)
-    bzero (p + buffered_chars, sizeof (word));
-}
-
-/* Given a vector of two file_data objects, find the identical
-   prefixes and suffixes of each object. */
-
-static void
-find_identical_ends (filevec)
-     struct file_data filevec[];
-{
-  word *w0, *w1;
-  char *p0, *p1, *buffer0, *buffer1;
-  char const *end0, *beg0;
-  char const **linbuf0, **linbuf1;
-  int i, lines;
-  size_t n0, n1, tem;
-  int alloc_lines0, alloc_lines1;
-  int buffered_prefix, prefix_count, prefix_mask;
-
-  slurp (&filevec[0]);
-  if (filevec[0].desc != filevec[1].desc)
-    slurp (&filevec[1]);
-  else
-    {
-      filevec[1].buffer = filevec[0].buffer;
-      filevec[1].bufsize = filevec[0].bufsize;
-      filevec[1].buffered_chars = filevec[0].buffered_chars;
-    }
-  for (i = 0; i < 2; i++)
-    prepare_text_end (&filevec[i]);
-
-  /* Find identical prefix.  */
-
-  p0 = buffer0 = filevec[0].buffer;
-  p1 = buffer1 = filevec[1].buffer;
-
-  n0 = filevec[0].buffered_chars;
-  n1 = filevec[1].buffered_chars;
-
-  if (p0 == p1)
-    /* The buffers are the same; sentinels won't work.  */
-    p0 = p1 += n1;
-  else
-    {
-      /* Insert end sentinels, in this case characters that are guaranteed
-	 to make the equality test false, and thus terminate the loop.  */
-
-      if (n0 < n1)
-	p0[n0] = ~p1[n0];
-      else
-	p1[n1] = ~p0[n1];
-
-      /* Loop until first mismatch, or to the sentinel characters.  */
-
-      /* Compare a word at a time for speed.  */
-      w0 = (word *) p0;
-      w1 = (word *) p1;
-      while (*w0++ == *w1++)
-	;
-      --w0, --w1;
-
-      /* Do the last few bytes of comparison a byte at a time.  */
-      p0 = (char *) w0;
-      p1 = (char *) w1;
-      while (*p0++ == *p1++)
-	;
-      --p0, --p1;
-
-      /* Don't mistakenly count missing newline as part of prefix. */
-      if (ROBUST_OUTPUT_STYLE (output_style)
-	  && (buffer0 + n0 - filevec[0].missing_newline < p0)
-	     !=
-	     (buffer1 + n1 - filevec[1].missing_newline < p1))
-	--p0, --p1;
-    }
-
-  /* Now P0 and P1 point at the first nonmatching characters.  */
-
-  /* Skip back to last line-beginning in the prefix,
-     and then discard up to HORIZON_LINES lines from the prefix.  */
-  i = horizon_lines;
-  while (p0 != buffer0 && (p0[-1] != '\n' || i--))
-    --p0, --p1;
-
-  /* Record the prefix.  */
-  filevec[0].prefix_end = p0;
-  filevec[1].prefix_end = p1;
-
-  /* Find identical suffix.  */
-
-  /* P0 and P1 point beyond the last chars not yet compared.  */
-  p0 = buffer0 + n0;
-  p1 = buffer1 + n1;
-
-  if (! ROBUST_OUTPUT_STYLE (output_style)
-      || filevec[0].missing_newline == filevec[1].missing_newline)
-    {
-      end0 = p0;	/* Addr of last char in file 0.  */
-
-      /* Get value of P0 at which we should stop scanning backward:
-	 this is when either P0 or P1 points just past the last char
-	 of the identical prefix.  */
-      beg0 = filevec[0].prefix_end + (n0 < n1 ? 0 : n0 - n1);
-
-      /* Scan back until chars don't match or we reach that point.  */
-      while (p0 != beg0)
-	if (*--p0 != *--p1)
-	  {
-	    /* Point at the first char of the matching suffix.  */
-	    ++p0, ++p1;
-	    beg0 = p0;
-	    break;
-	  }
-
-      /* Are we at a line-beginning in both files?  If not, add the rest of
-	 this line to the main body.  Discard up to HORIZON_LINES lines from
-	 the identical suffix.  Also, discard one extra line,
-	 because shift_boundaries may need it.  */
-      i = horizon_lines + !((buffer0 == p0 || p0[-1] == '\n')
-			    &&
-			    (buffer1 == p1 || p1[-1] == '\n'));
-      while (i-- && p0 != end0)
-	while (*p0++ != '\n')
-	  ;
-
-      p1 += p0 - beg0;
-    }
-
-  /* Record the suffix.  */
-  filevec[0].suffix_begin = p0;
-  filevec[1].suffix_begin = p1;
-
-  /* Calculate number of lines of prefix to save.
-
-     prefix_count == 0 means save the whole prefix;
-     we need this with for options like -D that output the whole file.
-     We also need it for options like -F that output some preceding line;
-     at least we will need to find the last few lines,
-     but since we don't know how many, it's easiest to find them all.
-
-     Otherwise, prefix_count != 0.  Save just prefix_count lines at start
-     of the line buffer; they'll be moved to the proper location later.
-     Handle 1 more line than the context says (because we count 1 too many),
-     rounded up to the next power of 2 to speed index computation.  */
-
-  if (no_diff_means_no_output && ! function_regexp_list)
-    {
-      for (prefix_count = 1;  prefix_count < context + 1;  prefix_count *= 2)
-	;
-      prefix_mask = prefix_count - 1;
-      alloc_lines0
-	= prefix_count
-	  + GUESS_LINES (0, 0, p0 - filevec[0].prefix_end)
-	  + context;
-    }
-  else
-    {
-      prefix_count = 0;
-      prefix_mask = ~0;
-      alloc_lines0 = GUESS_LINES (0, 0, n0);
-    }
-
-  lines = 0;
-  linbuf0 = (char const **) xmalloc (alloc_lines0 * sizeof (*linbuf0));
-
-  /* If the prefix is needed, find the prefix lines.  */
-  if (! (no_diff_means_no_output
-	 && filevec[0].prefix_end == p0
-	 && filevec[1].prefix_end == p1))
-    {
-      p0 = buffer0;
-      end0 = filevec[0].prefix_end;
-      while (p0 != end0)
-	{
-	  int l = lines++ & prefix_mask;
-	  if (l == alloc_lines0)
-	    linbuf0 = (char const **) xrealloc (linbuf0, (alloc_lines0 *= 2)
-							 * sizeof(*linbuf0));
-	  linbuf0[l] = p0;
-	  while (*p0++ != '\n')
-	    ;
-	}
-    }
-  buffered_prefix = prefix_count && context < lines ? context : lines;
-
-  /* Allocate line buffer 1.  */
-  tem = prefix_count ? filevec[1].suffix_begin - buffer1 : n1;
-
-  alloc_lines1
-    = (buffered_prefix
-       + GUESS_LINES (lines, filevec[1].prefix_end - buffer1, tem)
-       + context);
-  linbuf1 = (char const **) xmalloc (alloc_lines1 * sizeof (*linbuf1));
-
-  if (buffered_prefix != lines)
-    {
-      /* Rotate prefix lines to proper location.  */
-      for (i = 0;  i < buffered_prefix;  i++)
-	linbuf1[i] = linbuf0[(lines - context + i) & prefix_mask];
-      for (i = 0;  i < buffered_prefix;  i++)
-	linbuf0[i] = linbuf1[i];
-    }
-
-  /* Initialize line buffer 1 from line buffer 0.  */
-  for (i = 0; i < buffered_prefix; i++)
-    linbuf1[i] = linbuf0[i] - buffer0 + buffer1;
-
-  /* Record the line buffer, adjusted so that
-     linbuf*[0] points at the first differing line.  */
-  filevec[0].linbuf = linbuf0 + buffered_prefix;
-  filevec[1].linbuf = linbuf1 + buffered_prefix;
-  filevec[0].linbuf_base = filevec[1].linbuf_base = - buffered_prefix;
-  filevec[0].alloc_lines = alloc_lines0 - buffered_prefix;
-  filevec[1].alloc_lines = alloc_lines1 - buffered_prefix;
-  filevec[0].prefix_lines = filevec[1].prefix_lines = lines;
-}
-
-/* Largest primes less than some power of two, for nbuckets.  Values range
-   from useful to preposterous.  If one of these numbers isn't prime
-   after all, don't blame it on me, blame it on primes (6) . . . */
-static int const primes[] =
-{
-  509,
-  1021,
-  2039,
-  4093,
-  8191,
-  16381,
-  32749,
-#if 32767 < INT_MAX
-  65521,
-  131071,
-  262139,
-  524287,
-  1048573,
-  2097143,
-  4194301,
-  8388593,
-  16777213,
-  33554393,
-  67108859,			/* Preposterously large . . . */
-  134217689,
-  268435399,
-  536870909,
-  1073741789,
-  2147483647,
-#endif
-  0
-};
-
-/* Given a vector of two file_data objects, read the file associated
-   with each one, and build the table of equivalence classes.
-   Return 1 if either file appears to be a binary file.
-   If PRETEND_BINARY is nonzero, pretend they are binary regardless.  */
-
-int
-read_files (filevec, pretend_binary)
-     struct file_data filevec[];
-     int pretend_binary;
-{
-  int i;
-  int skip_test = always_text_flag | pretend_binary;
-  int appears_binary = pretend_binary | sip (&filevec[0], skip_test);
-
-  if (filevec[0].desc != filevec[1].desc)
-    appears_binary |= sip (&filevec[1], skip_test | appears_binary);
-  else
-    {
-      filevec[1].buffer = filevec[0].buffer;
-      filevec[1].bufsize = filevec[0].bufsize;
-      filevec[1].buffered_chars = filevec[0].buffered_chars;
-    }
-  if (appears_binary)
-    {
-#if HAVE_SETMODE
-      setmode (filevec[0].desc, O_BINARY);
-      setmode (filevec[1].desc, O_BINARY);
-#endif
-      return 1;
-    }
-
-  find_identical_ends (filevec);
-
-  equivs_alloc = filevec[0].alloc_lines + filevec[1].alloc_lines + 1;
-  equivs = (struct equivclass *) xmalloc (equivs_alloc * sizeof (struct equivclass));
-  /* Equivalence class 0 is permanently safe for lines that were not
-     hashed.  Real equivalence classes start at 1. */
-  equivs_index = 1;
-
-  for (i = 0;  primes[i] < equivs_alloc / 3;  i++)
-    if (! primes[i])
-      abort ();
-  nbuckets = primes[i];
-
-  buckets = (int *) xmalloc ((nbuckets + 1) * sizeof (*buckets));
-  bzero (buckets++, (nbuckets + 1) * sizeof (*buckets));
-
-  for (i = 0; i < 2; i++)
-    find_and_hash_each_line (&filevec[i]);
-
-  filevec[0].equiv_max = filevec[1].equiv_max = equivs_index;
-
-  free (equivs);
-  free (buckets - 1);
-
-  return 0;
-}
diff --git a/contrib/diff/normal.c b/contrib/diff/normal.c
deleted file mode 100644
index 4d9e23c..0000000
--- a/contrib/diff/normal.c
+++ /dev/null
@@ -1,71 +0,0 @@
-/* Normal-format output routines for GNU DIFF.
-   Copyright (C) 1988, 1989, 1993 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-
-#include "diff.h"
-
-static void print_normal_hunk PARAMS((struct change *));
-
-/* Print the edit-script SCRIPT as a normal diff.
-   INF points to an array of descriptions of the two files.  */
-
-void
-print_normal_script (script)
-     struct change *script;
-{
-  print_script (script, find_change, print_normal_hunk);
-}
-
-/* Print a hunk of a normal diff.
-   This is a contiguous portion of a complete edit script,
-   describing changes in consecutive lines.  */
-
-static void
-print_normal_hunk (hunk)
-     struct change *hunk;
-{
-  int first0, last0, first1, last1, deletes, inserts;
-  register int i;
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &first0, &last0, &first1, &last1, &deletes, &inserts);
-  if (!deletes && !inserts)
-    return;
-
-  begin_output ();
-
-  /* Print out the line number header for this hunk */
-  print_number_range (',', &files[0], first0, last0);
-  fprintf (outfile, "%c", change_letter (inserts, deletes));
-  print_number_range (',', &files[1], first1, last1);
-  fprintf (outfile, "\n");
-
-  /* Print the lines that the first file has.  */
-  if (deletes)
-    for (i = first0; i <= last0; i++)
-      print_1_line ("<", &files[0].linbuf[i]);
-
-  if (inserts && deletes)
-    fprintf (outfile, "---\n");
-
-  /* Print the lines that the second file has.  */
-  if (inserts)
-    for (i = first1; i <= last1; i++)
-      print_1_line (">", &files[1].linbuf[i]);
-}
diff --git a/contrib/diff/side.c b/contrib/diff/side.c
deleted file mode 100644
index a150b5e..0000000
--- a/contrib/diff/side.c
+++ /dev/null
@@ -1,284 +0,0 @@
-/* sdiff-format output routines for GNU DIFF.
-   Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY.  No author or distributor
-accepts responsibility to anyone for the consequences of using it
-or for whether it serves any particular purpose or works at all,
-unless he says so in writing.  Refer to the GNU DIFF General Public
-License for full details.
-
-Everyone is granted permission to copy, modify and redistribute
-GNU DIFF, but only under the conditions described in the
-GNU DIFF General Public License.   A copy of this license is
-supposed to have been given to you along with GNU DIFF so you
-can know your rights and responsibilities.  It should be in a
-file named COPYING.  Among other things, the copyright notice
-and this notice must be preserved on all copies.  */
-
-
-#include "diff.h"
-
-static unsigned print_half_line PARAMS((char const * const *, unsigned, unsigned));
-static unsigned tab_from_to PARAMS((unsigned, unsigned));
-static void print_1sdiff_line PARAMS((char const * const *, int, char const * const *));
-static void print_sdiff_common_lines PARAMS((int, int));
-static void print_sdiff_hunk PARAMS((struct change *));
-
-/* Next line number to be printed in the two input files.  */
-static int next0, next1;
-
-/* Print the edit-script SCRIPT as a sdiff style output.  */
-
-void
-print_sdiff_script (script)
-     struct change *script;
-{
-  begin_output ();
-
-  next0 = next1 = - files[0].prefix_lines;
-  print_script (script, find_change, print_sdiff_hunk);
-
-  print_sdiff_common_lines (files[0].valid_lines, files[1].valid_lines);
-}
-
-/* Tab from column FROM to column TO, where FROM <= TO.  Yield TO.  */
-
-static unsigned
-tab_from_to (from, to)
-     unsigned from, to;
-{
-  FILE *out = outfile;
-  unsigned tab;
-
-  if (! tab_expand_flag)
-    for (tab = from + TAB_WIDTH - from % TAB_WIDTH;  tab <= to;  tab += TAB_WIDTH)
-      {
-	putc ('\t', out);
-	from = tab;
-      }
-  while (from++ < to)
-    putc (' ', out);
-  return to;
-}
-
-/*
- * Print the text for half an sdiff line.  This means truncate to width
- * observing tabs, and trim a trailing newline.  Returns the last column
- * written (not the number of chars).
- */
-static unsigned
-print_half_line (line, indent, out_bound)
-     char const * const *line;
-     unsigned indent, out_bound;
-{
-  FILE *out = outfile;
-  register unsigned in_position = 0, out_position = 0;
-  register char const
-	*text_pointer = line[0],
-	*text_limit = line[1];
-
-  while (text_pointer < text_limit)
-    {
-      register unsigned char c = *text_pointer++;
-
-      switch (c)
-	{
-	case '\t':
-	  {
-	    unsigned spaces = TAB_WIDTH - in_position % TAB_WIDTH;
-	    if (in_position == out_position)
-	      {
-		unsigned tabstop = out_position + spaces;
-		if (tab_expand_flag)
-		  {
-		    if (out_bound < tabstop)
-		      tabstop = out_bound;
-		    for (;  out_position < tabstop;  out_position++)
-		      putc (' ', out);
-		  }
-		else
-		  if (tabstop < out_bound)
-		    {
-		      out_position = tabstop;
-		      putc (c, out);
-		    }
-	      }
-	    in_position += spaces;
-	  }
-	  break;
-
-	case '\r':
-	  {
-	    putc (c, out);
-	    tab_from_to (0, indent);
-	    in_position = out_position = 0;
-	  }
-	  break;
-
-	case '\b':
-	  if (in_position != 0 && --in_position < out_bound)
-	    if (out_position <= in_position)
-	      /* Add spaces to make up for suppressed tab past out_bound.  */
-	      for (;  out_position < in_position;  out_position++)
-		putc (' ', out);
-	    else
-	      {
-		out_position = in_position;
-		putc (c, out);
-	      }
-	  break;
-
-	case '\f':
-	case '\v':
-	control_char:
-	  if (in_position < out_bound)
-	    putc (c, out);
-	  break;
-
-	default:
-	  if (! ISPRINT (c))
-	    goto control_char;
-	  /* falls through */
-	case ' ':
-	  if (in_position++ < out_bound)
-	    {
-	      out_position = in_position;
-	      putc (c, out);
-	    }
-	  break;
-
-	case '\n':
-	  return out_position;
-	}
-    }
-
-  return out_position;
-}
-
-/*
- * Print side by side lines with a separator in the middle.
- * 0 parameters are taken to indicate white space text.
- * Blank lines that can easily be caught are reduced to a single newline.
- */
-
-static void
-print_1sdiff_line (left, sep, right)
-     char const * const *left;
-     int sep;
-     char const * const *right;
-{
-  FILE *out = outfile;
-  unsigned hw = sdiff_half_width, c2o = sdiff_column2_offset;
-  unsigned col = 0;
-  int put_newline = 0;
-
-  if (left)
-    {
-      if (left[1][-1] == '\n')
-	put_newline = 1;
-      col = print_half_line (left, 0, hw);
-    }
-
-  if (sep != ' ')
-    {
-      col = tab_from_to (col, (hw + c2o - 1) / 2) + 1;
-      if (sep == '|' && put_newline != (right[1][-1] == '\n'))
-	sep = put_newline ? '/' : '\\';
-      putc (sep, out);
-    }
-
-  if (right)
-    {
-      if (right[1][-1] == '\n')
-	put_newline = 1;
-      if (**right != '\n')
-	{
-	  col = tab_from_to (col, c2o);
-	  print_half_line (right, col, hw);
-	}
-    }
-
-  if (put_newline)
-    putc ('\n', out);
-}
-
-/* Print lines common to both files in side-by-side format.  */
-static void
-print_sdiff_common_lines (limit0, limit1)
-     int limit0, limit1;
-{
-  int i0 = next0, i1 = next1;
-
-  if (! sdiff_skip_common_lines  &&  (i0 != limit0 || i1 != limit1))
-    {
-      if (sdiff_help_sdiff)
-	fprintf (outfile, "i%d,%d\n", limit0 - i0, limit1 - i1);
-
-      if (! sdiff_left_only)
-	{
-	  while (i0 != limit0 && i1 != limit1)
-	    print_1sdiff_line (&files[0].linbuf[i0++], ' ', &files[1].linbuf[i1++]);
-	  while (i1 != limit1)
-	    print_1sdiff_line (0, ')', &files[1].linbuf[i1++]);
-	}
-      while (i0 != limit0)
-	print_1sdiff_line (&files[0].linbuf[i0++], '(', 0);
-    }
-
-  next0 = limit0;
-  next1 = limit1;
-}
-
-/* Print a hunk of an sdiff diff.
-   This is a contiguous portion of a complete edit script,
-   describing changes in consecutive lines.  */
-
-static void
-print_sdiff_hunk (hunk)
-     struct change *hunk;
-{
-  int first0, last0, first1, last1, deletes, inserts;
-  register int i, j;
-
-  /* Determine range of line numbers involved in each file.  */
-  analyze_hunk (hunk, &first0, &last0, &first1, &last1, &deletes, &inserts);
-  if (!deletes && !inserts)
-    return;
-
-  /* Print out lines up to this change.  */
-  print_sdiff_common_lines (first0, first1);
-
-  if (sdiff_help_sdiff)
-    fprintf (outfile, "c%d,%d\n", last0 - first0 + 1, last1 - first1 + 1);
-
-  /* Print ``xxx  |  xxx '' lines */
-  if (inserts && deletes)
-    {
-      for (i = first0, j = first1;  i <= last0 && j <= last1; ++i, ++j)
-	print_1sdiff_line (&files[0].linbuf[i], '|', &files[1].linbuf[j]);
-      deletes = i <= last0;
-      inserts = j <= last1;
-      next0 = first0 = i;
-      next1 = first1 = j;
-    }
-
-
-  /* Print ``     >  xxx '' lines */
-  if (inserts)
-    {
-      for (j = first1; j <= last1; ++j)
-	print_1sdiff_line (0, '>', &files[1].linbuf[j]);
-      next1 = j;
-    }
-
-  /* Print ``xxx  <     '' lines */
-  if (deletes)
-    {
-      for (i = first0; i <= last0; ++i)
-	print_1sdiff_line (&files[0].linbuf[i], '<', 0);
-      next0 = i;
-    }
-}
diff --git a/contrib/diff/stamp-h.in b/contrib/diff/stamp-h.in
deleted file mode 100644
index 3e01c72..0000000
--- a/contrib/diff/stamp-h.in
+++ /dev/null
@@ -1 +0,0 @@
-Fri Sep 30 22:22:28 PDT 1994
diff --git a/contrib/diff/system.h b/contrib/diff/system.h
deleted file mode 100644
index d60af60..0000000
--- a/contrib/diff/system.h
+++ /dev/null
@@ -1,267 +0,0 @@
-/* System dependent declarations.
-   Copyright (C) 1988, 1989, 1992, 1993, 1994 Free Software Foundation, Inc.
-
-This file is part of GNU DIFF.
-
-GNU DIFF is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU DIFF is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU DIFF; see the file COPYING.  If not, write to
-the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-/* We must define `volatile' and `const' first (the latter inside config.h),
-   so that they're used consistently in all system includes.  */
-#if !__STDC__
-#ifndef volatile
-#define volatile
-#endif
-#endif
-#include <config.h>
-
-#include <sys/types.h>
-#include <sys/stat.h>
-
-#if __STDC__
-#define PARAMS(args) args
-#define VOID void
-#else
-#define PARAMS(args) ()
-#define VOID char
-#endif
-
-#if STAT_MACROS_BROKEN
-#undef S_ISBLK
-#undef S_ISCHR
-#undef S_ISDIR
-#undef S_ISFIFO
-#undef S_ISREG
-#undef S_ISSOCK
-#endif
-#ifndef S_ISDIR
-#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
-#endif
-#ifndef S_ISREG
-#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
-#endif
-#if !defined(S_ISBLK) && defined(S_IFBLK)
-#define S_ISBLK(mode) (((mode) & S_IFMT) == S_IFBLK)
-#endif
-#if !defined(S_ISCHR) && defined(S_IFCHR)
-#define S_ISCHR(mode) (((mode) & S_IFMT) == S_IFCHR)
-#endif
-#if !defined(S_ISFIFO) && defined(S_IFFIFO)
-#define S_ISFIFO(mode) (((mode) & S_IFMT) == S_IFFIFO)
-#endif
-#if !defined(S_ISSOCK) && defined(S_IFSOCK)
-#define S_ISSOCK(mode) (((mode) & S_IFMT) == S_IFSOCK)
-#endif
-
-#if HAVE_UNISTD_H
-#include <unistd.h>
-#endif
-
-#ifndef SEEK_SET
-#define SEEK_SET 0
-#endif
-#ifndef SEEK_CUR
-#define SEEK_CUR 1
-#endif
-
-#ifndef STDIN_FILENO
-#define STDIN_FILENO 0
-#endif
-#ifndef STDOUT_FILENO
-#define STDOUT_FILENO 1
-#endif
-#ifndef STDERR_FILENO
-#define STDERR_FILENO 2
-#endif
-
-#if HAVE_TIME_H
-#include <time.h>
-#else
-#include <sys/time.h>
-#endif
-
-#if HAVE_FCNTL_H
-#include <fcntl.h>
-#else
-#if HAVE_SYS_FILE_H
-#include <sys/file.h>
-#endif
-#endif
-
-#if !HAVE_DUP2
-#define dup2(f,t)	(close (t),  fcntl (f,F_DUPFD,t))
-#endif
-
-#ifndef O_RDONLY
-#define O_RDONLY 0
-#endif
-
-#if HAVE_SYS_WAIT_H
-#include <sys/wait.h>
-#endif
-#ifndef WEXITSTATUS
-#define WEXITSTATUS(stat_val) ((unsigned) (stat_val) >> 8)
-#endif
-#ifndef WIFEXITED
-#define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
-#endif
-
-#ifndef STAT_BLOCKSIZE
-#if HAVE_ST_BLKSIZE
-#define STAT_BLOCKSIZE(s) (s).st_blksize
-#else
-#define STAT_BLOCKSIZE(s) (8 * 1024)
-#endif
-#endif
-
-#if HAVE_DIRENT_H
-# include <dirent.h>
-# define NAMLEN(dirent) strlen((dirent)->d_name)
-#else
-# define dirent direct
-# define NAMLEN(dirent) ((dirent)->d_namlen)
-# if HAVE_SYS_NDIR_H
-#  include <sys/ndir.h>
-# endif
-# if HAVE_SYS_DIR_H
-#  include <sys/dir.h>
-# endif
-# if HAVE_NDIR_H
-#  include <ndir.h>
-# endif
-#endif
-
-#if HAVE_VFORK_H
-#include <vfork.h>
-#endif
-
-#if HAVE_STDLIB_H
-#include <stdlib.h>
-#else
-VOID *malloc ();
-VOID *realloc ();
-#endif
-#ifndef getenv
-char *getenv ();
-#endif
-
-#if HAVE_LIMITS_H
-#include <limits.h>
-#endif
-#ifndef INT_MAX
-#define INT_MAX 2147483647
-#endif
-#ifndef CHAR_BIT
-#define CHAR_BIT 8
-#endif
-
-#if STDC_HEADERS || HAVE_STRING_H
-# include <string.h>
-# ifndef bzero
-#  define bzero(s, n) memset (s, 0, n)
-# endif
-#else
-# if !HAVE_STRCHR
-#  define strchr index
-#  define strrchr rindex
-# endif
-char *strchr (), *strrchr ();
-# if !HAVE_MEMCHR
-#  define memcmp(s1, s2, n) bcmp (s1, s2, n)
-#  define memcpy(d, s, n) bcopy (s, d, n)
-void *memchr ();
-# endif
-#endif
-
-#include <ctype.h>
-/* CTYPE_DOMAIN (C) is nonzero if the unsigned char C can safely be given
-   as an argument to <ctype.h> macros like `isspace'.  */
-#if STDC_HEADERS
-#define CTYPE_DOMAIN(c) 1
-#else
-#define CTYPE_DOMAIN(c) ((unsigned) (c) <= 0177)
-#endif
-#ifndef ISPRINT
-#define ISPRINT(c) (CTYPE_DOMAIN (c) && isprint (c))
-#endif
-#ifndef ISSPACE
-#define ISSPACE(c) (CTYPE_DOMAIN (c) && isspace (c))
-#endif
-#ifndef ISUPPER
-#define ISUPPER(c) (CTYPE_DOMAIN (c) && isupper (c))
-#endif
-
-#ifndef ISDIGIT
-#define ISDIGIT(c) ((unsigned) (c) - '0' <= 9)
-#endif
-
-#include <errno.h>
-#if !STDC_HEADERS
-extern int errno;
-#endif
-
-#ifdef min
-#undef min
-#endif
-#ifdef max
-#undef max
-#endif
-#define min(a,b) ((a) <= (b) ? (a) : (b))
-#define max(a,b) ((a) >= (b) ? (a) : (b))
-
-/* This section contains Posix-compliant defaults for macros
-   that are meant to be overridden by hand in config.h as needed.  */
-
-#ifndef filename_cmp
-#define filename_cmp(a, b) strcmp (a, b)
-#endif
-
-#ifndef filename_lastdirchar
-#define filename_lastdirchar(filename) strrchr (filename, '/')
-#endif
-
-#ifndef HAVE_FORK
-#define HAVE_FORK 1
-#endif
-
-#ifndef HAVE_SETMODE
-#define HAVE_SETMODE 0
-#endif
-
-#ifndef initialize_main
-#define initialize_main(argcp, argvp)
-#endif
-
-/* Do struct stat *S, *T describe the same file?  Answer -1 if unknown.  */
-#ifndef same_file
-#define same_file(s,t) ((s)->st_ino==(t)->st_ino && (s)->st_dev==(t)->st_dev)
-#endif
-
-/* Place into Q a quoted version of A suitable for `popen' or `system',
-   incrementing Q and junking A.
-   Do not increment Q by more than 4 * strlen (A) + 2.  */
-#ifndef SYSTEM_QUOTE_ARG
-#define SYSTEM_QUOTE_ARG(q, a) \
-  { \
-    *(q)++ = '\''; \
-    for (;  *(a);  *(q)++ = *(a)++) \
-      if (*(a) == '\'') \
-	{ \
-	  *(q)++ = '\''; \
-	  *(q)++ = '\\'; \
-	  *(q)++ = '\''; \
-	} \
-    *(q)++ = '\''; \
-  }
-#endif
diff --git a/contrib/diff/version.c b/contrib/diff/version.c
deleted file mode 100644
index 0299397..0000000
--- a/contrib/diff/version.c
+++ /dev/null
@@ -1,5 +0,0 @@
-/* Version number of GNU diff.  */
-
-#include <config.h>
-
-char const version_string[] = "2.7";
diff --git a/contrib/diff/xmalloc.c b/contrib/diff/xmalloc.c
deleted file mode 100644
index dc44ba4..0000000
--- a/contrib/diff/xmalloc.c
+++ /dev/null
@@ -1,81 +0,0 @@
-/* xmalloc.c -- malloc with out of memory checking
-   Copyright (C) 1990, 1991, 1993 Free Software Foundation, Inc.
-
-   This program is free software; you can redistribute it and/or modify
-   it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
-
-   This program is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-   GNU General Public License for more details.
-
-   You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software
-   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#if __STDC__
-#define VOID void
-#else
-#define VOID char
-#endif
-
-#include <sys/types.h>
-
-#if STDC_HEADERS
-#include <stdlib.h>
-#else
-VOID *malloc ();
-VOID *realloc ();
-void free ();
-#endif
-
-#if __STDC__ && defined (HAVE_VPRINTF)
-void error (int, int, char const *, ...);
-#else
-void error ();
-#endif
-
-/* Allocate N bytes of memory dynamically, with error checking.  */
-
-VOID *
-xmalloc (n)
-     size_t n;
-{
-  VOID *p;
-
-  p = malloc (n);
-  if (p == 0)
-    /* Must exit with 2 for `cmp'.  */
-    error (2, 0, "memory exhausted");
-  return p;
-}
-
-/* Change the size of an allocated block of memory P to N bytes,
-   with error checking.
-   If P is NULL, run xmalloc.
-   If N is 0, run free and return NULL.  */
-
-VOID *
-xrealloc (p, n)
-     VOID *p;
-     size_t n;
-{
-  if (p == 0)
-    return xmalloc (n);
-  if (n == 0)
-    {
-      free (p);
-      return 0;
-    }
-  p = realloc (p, n);
-  if (p == 0)
-    /* Must exit with 2 for `cmp'.  */
-    error (2, 0, "memory exhausted");
-  return p;
-}