diff options
Diffstat (limited to 'contrib')
-rw-r--r-- | contrib/diff/Makefile.in | 198 | ||||
-rw-r--r-- | contrib/diff/analyze.c | 1084 | ||||
-rw-r--r-- | contrib/diff/cmpbuf.c | 40 | ||||
-rw-r--r-- | contrib/diff/cmpbuf.h | 20 | ||||
-rw-r--r-- | contrib/diff/config.hin | 117 | ||||
-rwxr-xr-x | contrib/diff/configure | 2149 | ||||
-rw-r--r-- | contrib/diff/configure.in | 26 | ||||
-rw-r--r-- | contrib/diff/context.c | 468 | ||||
-rw-r--r-- | contrib/diff/diagmeet.note | 71 | ||||
-rw-r--r-- | contrib/diff/diff.texi | 3916 | ||||
-rw-r--r-- | contrib/diff/diff3.c | 1778 | ||||
-rw-r--r-- | contrib/diff/dir.c | 216 | ||||
-rw-r--r-- | contrib/diff/ed.c | 200 | ||||
-rw-r--r-- | contrib/diff/ifdef.c | 428 | ||||
-rwxr-xr-x | contrib/diff/install-sh | 238 | ||||
-rw-r--r-- | contrib/diff/io.c | 714 | ||||
-rw-r--r-- | contrib/diff/normal.c | 71 | ||||
-rw-r--r-- | contrib/diff/side.c | 284 | ||||
-rw-r--r-- | contrib/diff/stamp-h.in | 1 | ||||
-rw-r--r-- | contrib/diff/system.h | 267 | ||||
-rw-r--r-- | contrib/diff/version.c | 5 | ||||
-rw-r--r-- | contrib/diff/xmalloc.c | 81 |
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. 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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; -} |