BSD 4.4 Lite Usr.bin Sources

11 files changed, 3357 insertions, 0 deletions

diff --git a/usr.bin/patch/Makefile b/usr.bin/patch/Makefile
new file mode 100644
index 0000000..d6db9f7
--- /dev/null
+++ b/usr.bin/patch/Makefile
@@ -0,0 +1,6 @@
+#	@(#)Makefile	8.1 (Berkeley) 6/6/93
+
+PROG=	patch
+SRCS=	patch.c pch.c inp.c version.c util.c
+
+.include <bsd.prog.mk>
diff --git a/usr.bin/patch/README b/usr.bin/patch/README
new file mode 100644
index 0000000..017b1a0
--- /dev/null
+++ b/usr.bin/patch/README
@@ -0,0 +1,79 @@
+
+The Makefile and config.h files in this directory work with the current
+BSD release.  Don't run the Configure script, you'll get wrong results.
+
+Keith Bostic 1/10/88
+-----------------------------------------------------------------------------
+
+			Patch Kit, Version 2.0
+
+		    Copyright (c) 1986, Larry Wall
+
+You may copy the patch kit in whole or in part as long as you don't try to
+make money off it, or pretend that you wrote it.
+--------------------------------------------------------------------------
+
+Please read all the directions below before you proceed any further, and
+then follow them carefully.  Failure to do so may void your warranty. :-)
+
+After you have unpacked your kit, you should have all the files listed
+in MANIFEST.
+
+Installation
+
+1)  Run Configure.  This will figure out various things about your system.
+    Some things Configure will figure out for itself, other things it will
+    ask you about.  It will then proceed to make config.h, config.sh, and
+    Makefile.
+
+    You might possibly have to trim # comments from the front of Configure
+    if your sh doesn't handle them, but all other # comments will be taken
+    care of.
+
+    If you don't have sh, you'll have to rip the prototype of config.h out
+    of Configure and generate the defines by hand.
+
+2)  Glance through config.h to make sure system dependencies are correct.
+    Most of them should have been taken care of by running the Configure script.
+
+    If you have any additional changes to make to the C definitions, they
+    can be done in the Makefile, or in config.h.  Bear in mind that they may
+    get undone next time you run Configure.
+
+3)  make
+
+    This will attempt to make patch in the current directory.
+
+4)  make install
+
+    This will put patch into a public directory (normally /usr/local/bin).
+    It will also try to put the man pages in a reasonable place.  It will not
+    nroff the man page, however.
+
+5)  Read the manual entry before running patch.
+
+6)  IMPORTANT!  Help save the world!  Communicate any problems and
+    suggested patches to me, lwall@sdcrdcf.UUCP (Larry Wall), so we can
+    keep the world in sync.  If you have a problem, there's someone else
+    out there who either has had or will have the same problem.
+
+    If possible, send in patches such that the patch program will apply them.
+    Context diffs are the best, then normal diffs.  Don't send ed scripts--
+    I've probably changed my copy since the version you have.
+
+    Watch for patch patches in net.sources.bugs.  Patches will generally be
+    in a form usable by the patch program.  If you are just now bringing up
+    patch and aren't sure how many patches there are, write to me and I'll
+    send any you don't have.  Your current patch level is shown in patchlevel.h.
+
+
+NEW FEATURES IN THIS RELEASE
+
+(Correct) support for 4.3bsd-style context diffs.
+Files can be created from scratch.
+You can specify a fuzz-factor for context matching.
+You can force patch to ask no questions.
+You can specify how much of the leading pathname to strip off filenames.
+Uses a Configure script for greater portability.
+You are now asked if you want to apply a reversed patch.
+No limit (apart from memory) on the size of hunks.
diff --git a/usr.bin/patch/common.h b/usr.bin/patch/common.h
new file mode 100644
index 0000000..42d6883
--- /dev/null
+++ b/usr.bin/patch/common.h
@@ -0,0 +1,138 @@
+/* $Header: common.h,v 2.0 86/09/17 15:36:39 lwall Exp $
+ *
+ * $Log:	common.h,v $
+ * Revision 2.0  86/09/17  15:36:39  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+#define DEBUGGING
+
+#include "config.h"
+
+/* shut lint up about the following when return value ignored */
+
+#define Signal (void)signal
+#define Unlink (void)unlink
+#define Lseek (void)lseek
+#define Fseek (void)fseek
+#define Fstat (void)fstat
+#define Pclose (void)pclose
+#define Close (void)close
+#define Fclose (void)fclose
+#define Fflush (void)fflush
+#define Sprintf (void)sprintf
+#define Mktemp (void)mktemp
+#define Strcpy (void)strcpy
+#define Strcat (void)strcat
+
+#include <stdio.h>
+#include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <ctype.h>
+#include <signal.h>
+
+/* constants */
+
+#define TRUE (1)
+#define FALSE (0)
+
+#define MAXHUNKSIZE 100000		/* is this enough lines? */
+#define INITHUNKMAX 125			/* initial dynamic allocation size */
+#define MAXLINELEN 1024
+#define BUFFERSIZE 1024
+#define ORIGEXT ".orig"
+#define SCCSPREFIX "s."
+#define GET "get -e %s"
+#define RCSSUFFIX ",v"
+#define CHECKOUT "co -l %s"
+
+/* handy definitions */
+
+#define Null(t) ((t)0)
+#define Nullch Null(char *)
+#define Nullfp Null(FILE *)
+#define Nulline Null(LINENUM)
+
+#define Ctl(ch) ((ch) & 037)
+
+#define strNE(s1,s2) (strcmp(s1, s2))
+#define strEQ(s1,s2) (!strcmp(s1, s2))
+#define strnNE(s1,s2,l) (strncmp(s1, s2, l))
+#define strnEQ(s1,s2,l) (!strncmp(s1, s2, l))
+
+/* typedefs */
+
+typedef char bool;
+typedef long LINENUM;			/* must be signed */
+typedef unsigned MEM;			/* what to feed malloc */
+
+/* globals */
+
+EXT int Argc;				/* guess */
+EXT char **Argv;
+EXT int Argc_last;			/* for restarting plan_b */
+EXT char **Argv_last;
+
+EXT struct stat filestat;		/* file statistics area */
+EXT int filemode INIT(0644);
+
+EXT char buf[MAXLINELEN];		/* general purpose buffer */
+EXT FILE *ofp INIT(Nullfp);		/* output file pointer */
+EXT FILE *rejfp INIT(Nullfp);		/* reject file pointer */
+
+EXT bool using_plan_a INIT(TRUE);	/* try to keep everything in memory */
+EXT bool out_of_mem INIT(FALSE);	/* ran out of memory in plan a */
+
+#define MAXFILEC 2
+EXT int filec INIT(0);			/* how many file arguments? */
+EXT char *filearg[MAXFILEC];
+EXT bool ok_to_create_file INIT(FALSE);
+EXT char *bestguess INIT(Nullch);	/* guess at correct filename */
+
+EXT char *outname INIT(Nullch);
+EXT char rejname[128];
+
+EXT char *origext INIT(Nullch);
+
+EXT char TMPOUTNAME[] INIT("/tmp/patchoXXXXXX");
+EXT char TMPINNAME[] INIT("/tmp/patchiXXXXXX");	/* might want /usr/tmp here */
+EXT char TMPREJNAME[] INIT("/tmp/patchrXXXXXX");
+EXT char TMPPATNAME[] INIT("/tmp/patchpXXXXXX");
+EXT bool toutkeep INIT(FALSE);
+EXT bool trejkeep INIT(FALSE);
+
+EXT LINENUM last_offset INIT(0);
+#ifdef DEBUGGING
+EXT int debug INIT(0);
+#endif
+EXT LINENUM maxfuzz INIT(2);
+EXT bool force INIT(FALSE);
+EXT bool verbose INIT(TRUE);
+EXT bool reverse INIT(FALSE);
+EXT bool noreverse INIT(FALSE);
+EXT bool skip_rest_of_patch INIT(FALSE);
+EXT int strippath INIT(957);
+EXT bool canonicalize INIT(FALSE);
+
+#define CONTEXT_DIFF 1
+#define NORMAL_DIFF 2
+#define ED_DIFF 3
+#define NEW_CONTEXT_DIFF 4
+EXT int diff_type INIT(0);
+
+EXT bool do_defines INIT(FALSE);	/* patch using ifdef, ifndef, etc. */
+EXT char if_defined[128];		/* #ifdef xyzzy */
+EXT char not_defined[128];		/* #ifndef xyzzy */
+EXT char else_defined[] INIT("#else\n");/* #else */
+EXT char end_defined[128];		/* #endif xyzzy */
+
+EXT char *revision INIT(Nullch);	/* prerequisite revision, if any */
+
+char *malloc();
+char *realloc();
+char *strcpy();
+char *strcat();
+long atol();
+char *mktemp();
diff --git a/usr.bin/patch/inp.c b/usr.bin/patch/inp.c
new file mode 100644
index 0000000..a3eeb90
--- /dev/null
+++ b/usr.bin/patch/inp.c
@@ -0,0 +1,313 @@
+/* $Header: inp.c,v 2.0 86/09/17 15:37:02 lwall Exp $
+ *
+ * $Log:	inp.c,v $
+ * Revision 2.0  86/09/17  15:37:02  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+#include "EXTERN.h"
+#include "common.h"
+#include "util.h"
+#include "pch.h"
+#include "INTERN.h"
+#include "inp.h"
+
+/* Input-file-with-indexable-lines abstract type */
+
+static long i_size;			/* size of the input file */
+static char *i_womp;			/* plan a buffer for entire file */
+static char **i_ptr;			/* pointers to lines in i_womp */
+
+static int tifd = -1;			/* plan b virtual string array */
+static char *tibuf[2];			/* plan b buffers */
+static LINENUM tiline[2] = {-1, -1};	/* 1st line in each buffer */
+static LINENUM lines_per_buf;		/* how many lines per buffer */
+static int tireclen;			/* length of records in tmp file */
+
+/* New patch--prepare to edit another file. */
+
+void
+re_input()
+{
+    if (using_plan_a) {
+	i_size = 0;
+#ifndef lint
+	if (i_ptr != Null(char**))
+	    free((char *)i_ptr);
+#endif
+	if (i_womp != Nullch)
+	    free(i_womp);
+	i_womp = Nullch;
+	i_ptr = Null(char **);
+    }
+    else {
+	using_plan_a = TRUE;		/* maybe the next one is smaller */
+	Close(tifd);
+	tifd = -1;
+	free(tibuf[0]);
+	free(tibuf[1]);
+	tibuf[0] = tibuf[1] = Nullch;
+	tiline[0] = tiline[1] = -1;
+	tireclen = 0;
+    }
+}
+
+/* Constuct the line index, somehow or other. */
+
+void
+scan_input(filename)
+char *filename;
+{
+    if (!plan_a(filename))
+	plan_b(filename);
+    if (verbose) {
+	say3("Patching file %s using Plan %s...\n", filename,
+	  (using_plan_a ? "A" : "B") );
+    }
+}
+
+/* Try keeping everything in memory. */
+
+bool
+plan_a(filename)
+char *filename;
+{
+    int ifd;
+    Reg1 char *s;
+    Reg2 LINENUM iline;
+
+    if (ok_to_create_file && stat(filename, &filestat) < 0) {
+	if (verbose)
+	    say2("(Creating file %s...)\n",filename);
+	makedirs(filename, TRUE);
+	close(creat(filename, 0666));
+    }
+    if (stat(filename, &filestat) < 0) {
+	Sprintf(buf, "RCS/%s%s", filename, RCSSUFFIX);
+	if (stat(buf, &filestat) >= 0 || stat(buf+4, &filestat) >= 0) {
+	    Sprintf(buf, CHECKOUT, filename);
+	    if (verbose)
+		say2("Can't find %s--attempting to check it out from RCS.\n",
+		    filename);
+	    if (system(buf) || stat(filename, &filestat))
+		fatal2("Can't check out %s.\n", filename);
+	}
+	else {
+	    Sprintf(buf, "SCCS/%s%s", SCCSPREFIX, filename);
+	    if (stat(buf, &filestat) >= 0 || stat(buf+5, &filestat) >= 0) {
+		Sprintf(buf, GET, filename);
+		if (verbose)
+		    say2("Can't find %s--attempting to get it from SCCS.\n",
+			filename);
+		if (system(buf) || stat(filename, &filestat))
+		    fatal2("Can't get %s.\n", filename);
+	    }
+	    else
+		fatal2("Can't find %s.\n", filename);
+	}
+    }
+    filemode = filestat.st_mode;
+    if ((filemode & S_IFMT) & ~S_IFREG)
+	fatal2("%s is not a normal file--can't patch.\n", filename);
+    i_size = filestat.st_size;
+    if (out_of_mem) {
+	set_hunkmax();		/* make sure dynamic arrays are allocated */
+	out_of_mem = FALSE;
+	return FALSE;			/* force plan b because plan a bombed */
+    }
+#ifdef lint
+    i_womp = Nullch;
+#else
+    i_womp = malloc((MEM)(i_size+2));	/* lint says this may alloc less than */
+					/* i_size, but that's okay, I think. */
+#endif
+    if (i_womp == Nullch)
+	return FALSE;
+    if ((ifd = open(filename, 0)) < 0)
+	fatal2("Can't open file %s\n", filename);
+#ifndef lint
+    if (read(ifd, i_womp, (int)i_size) != i_size) {
+	Close(ifd);	/* probably means i_size > 15 or 16 bits worth */
+	free(i_womp);	/* at this point it doesn't matter if i_womp was */
+	return FALSE;	/*   undersized. */
+    }
+#endif
+    Close(ifd);
+    if (i_size && i_womp[i_size-1] != '\n')
+	i_womp[i_size++] = '\n';
+    i_womp[i_size] = '\0';
+
+    /* count the lines in the buffer so we know how many pointers we need */
+
+    iline = 0;
+    for (s=i_womp; *s; s++) {
+	if (*s == '\n')
+	    iline++;
+    }
+#ifdef lint
+    i_ptr = Null(char**);
+#else
+    i_ptr = (char **)malloc((MEM)((iline + 2) * sizeof(char *)));
+#endif
+    if (i_ptr == Null(char **)) {	/* shucks, it was a near thing */
+	free((char *)i_womp);
+	return FALSE;
+    }
+    
+    /* now scan the buffer and build pointer array */
+
+    iline = 1;
+    i_ptr[iline] = i_womp;
+    for (s=i_womp; *s; s++) {
+	if (*s == '\n')
+	    i_ptr[++iline] = s+1;	/* these are NOT null terminated */
+    }
+    input_lines = iline - 1;
+
+    /* now check for revision, if any */
+
+    if (revision != Nullch) { 
+	if (!rev_in_string(i_womp)) {
+	    if (force) {
+		if (verbose)
+		    say2("\
+Warning: this file doesn't appear to be the %s version--patching anyway.\n",
+			revision);
+	    }
+	    else {
+		ask2("\
+This file doesn't appear to be the %s version--patch anyway? [n] ",
+		    revision);
+	    if (*buf != 'y')
+		fatal1("Aborted.\n");
+	    }
+	}
+	else if (verbose)
+	    say2("Good.  This file appears to be the %s version.\n",
+		revision);
+    }
+    return TRUE;			/* plan a will work */
+}
+
+/* Keep (virtually) nothing in memory. */
+
+void
+plan_b(filename)
+char *filename;
+{
+    Reg3 FILE *ifp;
+    Reg1 int i = 0;
+    Reg2 int maxlen = 1;
+    Reg4 bool found_revision = (revision == Nullch);
+
+    using_plan_a = FALSE;
+    if ((ifp = fopen(filename, "r")) == Nullfp)
+	fatal2("Can't open file %s\n", filename);
+    if ((tifd = creat(TMPINNAME, 0666)) < 0)
+	fatal2("Can't open file %s\n", TMPINNAME);
+    while (fgets(buf, sizeof buf, ifp) != Nullch) {
+	if (revision != Nullch && !found_revision && rev_in_string(buf))
+	    found_revision = TRUE;
+	if ((i = strlen(buf)) > maxlen)
+	    maxlen = i;			/* find longest line */
+    }
+    if (revision != Nullch) {
+	if (!found_revision) {
+	    if (force) {
+		if (verbose)
+		    say2("\
+Warning: this file doesn't appear to be the %s version--patching anyway.\n",
+			revision);
+	    }
+	    else {
+		ask2("\
+This file doesn't appear to be the %s version--patch anyway? [n] ",
+		    revision);
+		if (*buf != 'y')
+		    fatal1("Aborted.\n");
+	    }
+	}
+	else if (verbose)
+	    say2("Good.  This file appears to be the %s version.\n",
+		revision);
+    }
+    Fseek(ifp, 0L, 0);		/* rewind file */
+    lines_per_buf = BUFFERSIZE / maxlen;
+    tireclen = maxlen;
+    tibuf[0] = malloc((MEM)(BUFFERSIZE + 1));
+    tibuf[1] = malloc((MEM)(BUFFERSIZE + 1));
+    if (tibuf[1] == Nullch)
+	fatal1("Can't seem to get enough memory.\n");
+    for (i=1; ; i++) {
+	if (! (i % lines_per_buf))	/* new block */
+	    if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
+		fatal1("patch: can't write temp file.\n");
+	if (fgets(tibuf[0] + maxlen * (i%lines_per_buf), maxlen + 1, ifp)
+	  == Nullch) {
+	    input_lines = i - 1;
+	    if (i % lines_per_buf)
+		if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
+		    fatal1("patch: can't write temp file.\n");
+	    break;
+	}
+    }
+    Fclose(ifp);
+    Close(tifd);
+    if ((tifd = open(TMPINNAME, 0)) < 0) {
+	fatal2("Can't reopen file %s\n", TMPINNAME);
+    }
+}
+
+/* Fetch a line from the input file, \n terminated, not necessarily \0. */
+
+char *
+ifetch(line,whichbuf)
+Reg1 LINENUM line;
+int whichbuf;				/* ignored when file in memory */
+{
+    if (line < 1 || line > input_lines)
+	return "";
+    if (using_plan_a)
+	return i_ptr[line];
+    else {
+	LINENUM offline = line % lines_per_buf;
+	LINENUM baseline = line - offline;
+
+	if (tiline[0] == baseline)
+	    whichbuf = 0;
+	else if (tiline[1] == baseline)
+	    whichbuf = 1;
+	else {
+	    tiline[whichbuf] = baseline;
+#ifndef lint		/* complains of long accuracy */
+	    Lseek(tifd, (off_t)baseline / lines_per_buf * BUFFERSIZE, 0);
+#endif
+	    if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
+		fatal2("Error reading tmp file %s.\n", TMPINNAME);
+	}
+	return tibuf[whichbuf] + (tireclen*offline);
+    }
+}
+
+/* True if the string argument contains the revision number we want. */
+
+bool
+rev_in_string(string)
+char *string;
+{
+    Reg1 char *s;
+    Reg2 int patlen;
+
+    if (revision == Nullch)
+	return TRUE;
+    patlen = strlen(revision);
+    for (s = string; *s; s++) {
+	if (isspace(*s) && strnEQ(s+1, revision, patlen) && 
+		isspace(s[patlen+1] )) {
+	    return TRUE;
+	}
+    }
+    return FALSE;
+}
+
diff --git a/usr.bin/patch/inp.h b/usr.bin/patch/inp.h
new file mode 100644
index 0000000..c6d2a91
--- /dev/null
+++ b/usr.bin/patch/inp.h
@@ -0,0 +1,18 @@
+/* $Header: inp.h,v 2.0 86/09/17 15:37:25 lwall Exp $
+ *
+ * $Log:	inp.h,v $
+ * Revision 2.0  86/09/17  15:37:25  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+EXT LINENUM input_lines INIT(0);	/* how long is input file in lines */
+EXT LINENUM last_frozen_line INIT(0);	/* how many input lines have been */
+					/* irretractibly output */
+
+bool rev_in_string();
+void scan_input();
+bool plan_a();			/* returns false if insufficient memory */
+void plan_b();
+char *ifetch();
+
diff --git a/usr.bin/patch/patch.1 b/usr.bin/patch/patch.1
new file mode 100644
index 0000000..3e4a12e
--- /dev/null
+++ b/usr.bin/patch/patch.1
@@ -0,0 +1,446 @@
+''' $Header: patch.man,v 2.0 86/09/17 15:39:09 lwall Exp $
+''' 
+''' $Log:	patch.man,v $
+''' Revision 2.0  86/09/17  15:39:09  lwall
+''' Baseline for netwide release.
+''' 
+''' Revision 1.4  86/08/01  19:23:22  lwall
+''' Documented -v, -p, -F.
+''' Added notes to patch senders.
+''' 
+''' Revision 1.3  85/03/26  15:11:06  lwall
+''' Frozen.
+''' 
+''' Revision 1.2.1.4  85/03/12  16:14:27  lwall
+''' Documented -p.
+''' 
+''' Revision 1.2.1.3  85/03/12  16:09:41  lwall
+''' Documented -D.
+''' 
+''' Revision 1.2.1.2  84/12/05  11:06:55  lwall
+''' Added -l switch, and noted bistability bug.
+''' 
+''' Revision 1.2.1.1  84/12/04  17:23:39  lwall
+''' Branch for sdcrdcf changes.
+''' 
+''' Revision 1.2  84/12/04  17:22:02  lwall
+''' Baseline version.
+''' 
+.de Sh
+.br
+.ne 5
+.PP
+\fB\\$1\fR
+.PP
+..
+.de Sp
+.if t .sp .5v
+.if n .sp
+..
+'''
+'''     Set up \*(-- to give an unbreakable dash;
+'''     string Tr holds user defined translation string.
+'''     Bell System Logo is used as a dummy character.
+'''
+.ie n \{\
+.tr \(bs-\*(Tr
+.ds -- \(bs-
+.if (\n(.H=4u)&(1m=24u) .ds -- \(bs\h'-12u'\(bs\h'-12u'-\" diablo 10 pitch
+.if (\n(.H=4u)&(1m=20u) .ds -- \(bs\h'-12u'\(bs\h'-8u'-\" diablo 12 pitch
+.ds L" ""
+.ds R" ""
+.ds L' '
+.ds R' '
+'br\}
+.el\{\
+.ds -- \(em\|
+.tr \*(Tr
+.ds L" ``
+.ds R" ''
+.ds L' `
+.ds R' '
+'br\}
+.TH PATCH 1 "June 30, 1993"
+.SH NAME
+patch \- a program for applying a diff file to an original
+.SH SYNOPSIS
+.B patch
+[options] orig patchfile [+ [options] orig]
+.sp
+but usually just
+.sp
+.B patch
+<patchfile
+.SH DESCRIPTION
+.I Patch
+will take a patch file containing any of the three forms of difference
+listing produced by the
+.I diff
+program and apply those differences to an original file, producing a patched
+version.
+By default, the patched version is put in place of the original, with
+the original file backed up to the same name with the
+extension \*(L".orig\*(R", or as specified by the
+.B -b
+switch.
+You may also specify where you want the output to go with a
+.B -o
+switch.
+If
+.I patchfile
+is omitted, or is a hyphen, the patch will be read from standard input.
+.PP
+Upon startup, patch will attempt to determine the type of the diff listing,
+unless over-ruled by a
+.BR -c ,
+.BR -e ,
+or
+.B -n
+switch.
+Context diffs and normal diffs are applied by the
+.I patch
+program itself, while ed diffs are simply fed to the
+.I ed
+editor via a pipe.
+.PP
+.I Patch
+will try to skip any leading garbage, apply the diff,
+and then skip any trailing garbage.
+Thus you could feed an article or message containing a
+diff listing to
+.IR patch ,
+and it should work.
+If the entire diff is indented by a consistent amount,
+this will be taken into account.
+.PP
+With context diffs, and to a lesser extent with normal diffs,
+.I patch
+can detect when the line numbers mentioned in the patch are incorrect,
+and will attempt to find the correct place to apply each hunk of the patch.
+As a first guess, it takes the line number mentioned for the hunk, plus or
+minus any offset used in applying the previous hunk.
+If that is not the correct place,
+.I patch
+will scan both forwards and backwards for a set of lines matching the context
+given in the hunk.
+First
+.I patch
+looks for a place where all lines of the context match.
+If no such place is found, and it's a context diff, and the maximum fuzz factor
+is set to 1 or more, then another scan takes place ignoring the first and last
+line of context.
+If that fails, and the maximum fuzz factor is set to 2 or more,
+the first two and last two lines of context are ignored,
+and another scan is made.
+(The default maximum fuzz factor is 2.)
+If
+.I patch
+cannot find a place to install that hunk of the patch, it will put the
+hunk out to a reject file, which normally is the name of the output file
+plus \*(L".rej\*(R".
+(Note that the rejected hunk will come out in context diff form whether the
+input patch was a context diff or a normal diff.
+If the input was a normal diff, many of the contexts will simply be null.)
+The line numbers on the hunks in the reject file may be different than
+in the patch file: they reflect the approximate location patch thinks the
+failed hunks belong in the new file rather than the old one.
+.PP
+As each hunk is completed, you will be told whether the hunk succeeded or
+failed, and which line (in the new file)
+.I patch
+thought the hunk should go on.
+If this is different from the line number specified in the diff you will
+be told the offset.
+A single large offset MAY be an indication that a hunk was installed in the
+wrong place.
+You will also be told if a fuzz factor was used to make the match, in which
+case you should also be slightly suspicious.
+.PP
+If no original file is specified on the command line,
+.I patch
+will try to figure out from the leading garbage what the name of the file
+to edit is.
+In the header of a context diff, the filename is found from lines beginning
+with \*(L"***\*(R" or \*(L"---\*(R", with the shortest name of an existing
+file winning.
+Only context diffs have lines like that, but if there is an \*(L"Index:\*(R"
+line in the leading garbage,
+.I patch
+will try to use the filename from that line.
+The context diff header takes precedence over an Index line.
+If no filename can be intuited from the leading garbage, you will be asked
+for the name of the file to patch.
+.PP
+(If the original file cannot be found, but a suitable SCCS or RCS file is
+handy,
+.I patch
+will attempt to get or check out the file.)
+.PP
+Additionally, if the leading garbage contains a \*(L"Prereq: \*(R" line,
+.I patch
+will take the first word from the prerequisites line (normally a version
+number) and check the input file to see if that word can be found.
+If not,
+.I patch
+will ask for confirmation before proceeding.
+.PP
+The upshot of all this is that you should be able to say, while in a news
+interface, the following:
+.Sp
+	| patch -d /usr/src/local/blurfl
+.Sp
+and patch a file in the blurfl directory directly from the article containing
+the patch.
+.PP
+If the patch file contains more than one patch,
+.I patch
+will try to apply each of them as if they came from separate patch files.
+This means, among other things, that it is assumed that the name of the file
+to patch must be determined for each diff listing,
+and that the garbage before each diff listing will
+be examined for interesting things such as filenames and revision level, as
+mentioned previously.
+You can give switches (and another original file name) for the second and
+subsequent patches by separating the corresponding argument lists
+by a \*(L'+\*(R'.
+(The argument list for a second or subsequent patch may not specify a new
+patch file, however.)
+.PP
+.I Patch
+recognizes the following switches:
+.TP 5
+.B \-b
+causes the next argument to be interpreted as the backup extension, to be
+used in place of \*(L".orig\*(R".
+.TP 5
+.B \-c
+forces
+.I patch
+to interpret the patch file as a context diff.
+.TP 5
+.B \-d
+causes
+.I patch
+to interpret the next argument as a directory, and cd to it before doing
+anything else.
+.TP 5
+.B \-D
+causes
+.I patch
+to use the "#ifdef...#endif" construct to mark changes.
+The argument following will be used as the differentiating symbol.
+Note that, unlike the C compiler, there must be a space between the
+.B \-D
+and the argument.
+.TP 5
+.B \-e
+forces
+.I patch
+to interpret the patch file as an ed script.
+.TP 5
+.B \-f
+forces
+.I patch
+to assume that the user knows exactly what he or she is doing, and to not
+ask any questions.
+It does not suppress commentary, however.
+Use
+.B \-s
+for that.
+.TP 5
+.B \-F<number>
+sets the maximum fuzz factor.
+This switch only applied to context diffs, and causes
+.I patch
+to ignore up to that many lines in looking for places to install a hunk.
+Note that a larger fuzz factor increases the odds of a faulty patch.
+The default fuzz factor is 2, and it may not be set to more than
+the number of lines of context in the context diff, ordinarily 3.
+.TP 5
+.B \-l
+causes the pattern matching to be done loosely, in case the tabs and
+spaces have been munged in your input file.
+Any sequence of whitespace in the pattern line will match any sequence
+in the input file.
+Normal characters must still match exactly.
+Each line of the context must still match a line in the input file.
+.TP 5
+.B \-n
+forces
+.I patch
+to interpret the patch file as a normal diff.
+.TP 5
+.B \-N
+causes
+.I patch
+to ignore patches that it thinks are reversed or already applied.
+See also
+.B \-R .
+.TP 5
+.B \-o
+causes the next argument to be interpreted as the output file name.
+.TP 5
+.B \-p<number>
+sets the pathname strip count,
+which controls how pathnames found in the patch file are treated, in case
+the you keep your files in a different directory than the person who sent
+out the patch.
+The strip count specifies how many backslashes are to be stripped from
+the front of the pathname.
+(Any intervening directory names also go away.)
+For example, supposing the filename in the patch file was
+.sp
+	/u/howard/src/blurfl/blurfl.c
+.sp
+setting
+.B \-p
+or
+.B \-p0
+gives the entire pathname unmodified,
+.B \-p1
+gives
+.sp
+	u/howard/src/blurfl/blurfl.c
+.sp
+without the leading slash,
+.B \-p4
+gives
+.sp
+	blurfl/blurfl.c
+.sp
+and not specifying
+.B \-p
+at all just gives you "blurfl.c".
+Whatever you end up with is looked for either in the current directory,
+or the directory specified by the
+.B \-d
+switch.
+.TP 5
+.B \-r
+causes the next argument to be interpreted as the reject file name.
+.TP 5
+.B \-R
+tells
+.I patch
+that this patch was created with the old and new files swapped.
+(Yes, I'm afraid that does happen occasionally, human nature being what it
+is.)
+.I Patch
+will attempt to swap each hunk around before applying it.
+Rejects will come out in the swapped format.
+The
+.B \-R
+switch will not work with ed diff scripts because there is too little
+information to reconstruct the reverse operation.
+.Sp
+If the first hunk of a patch fails,
+.I patch
+will reverse the hunk to see if it can be applied that way.
+If it can, you will be asked if you want to have the
+.B \-R
+switch set.
+If it can't, the patch will continue to be applied normally.
+(Note: this method cannot detect a reversed patch if it is a normal diff
+and if the first command is an append (i.e. it should have been a delete)
+since appends always succeed, due to the fact that a null context will match
+anywhere.
+Luckily, most patches add or change lines rather than delete them, so most
+reversed normal diffs will begin with a delete, which will fail, triggering
+the heuristic.)
+.TP 5
+.B \-s
+makes
+.I patch
+do its work silently, unless an error occurs.
+.TP 5
+.B \-S
+causes
+.I patch
+to ignore this patch from the patch file, but continue on looking
+for the next patch in the file.
+Thus
+.sp
+	patch -S + -S + <patchfile
+.sp
+will ignore the first and second of three patches.
+.TP 5
+.B \-v
+causes
+.I patch
+to print out it's revision header and patch level.
+.TP 5
+.B \-x<number>
+sets internal debugging flags, and is of interest only to
+.I patch
+patchers.
+.SH ENVIRONMENT
+No environment variables are used by
+.IR patch .
+.SH FILES
+/tmp/patch*
+.SH SEE ALSO
+diff(1)
+.SH NOTES FOR PATCH SENDERS
+There are several things you should bear in mind if you are going to
+be sending out patches.
+First, you can save people a lot of grief by keeping a patchlevel.h file
+which is patched to increment the patch level as the first diff in the
+patch file you send out.
+If you put a Prereq: line in with the patch, it won't let them apply
+patches out of order without some warning.
+Second, make sure you've specified the filenames right, either in a
+context diff header, or with an Index: line.
+If you are patching something in a subdirectory, be sure to tell the patch
+user to specify a 
+.B \-p
+switch as needed.
+Third, you can create a file by sending out a diff that compares a
+null file to the file you want to create.
+This will only work if the file you want to create doesn't exist already in
+the target directory.
+Fourth, take care not to send out reversed patches, since it makes people wonder
+whether they already applied the patch.
+Fifth, while you may be able to get away with putting 582 diff listings into
+one file, it is probably wiser to group related patches into separate files in
+case something goes haywire.
+.SH DIAGNOSTICS
+Too many to list here, but generally indicative that
+.I patch
+couldn't parse your patch file.
+.PP
+The message \*(L"Hmm...\*(R" indicates that there is unprocessed text in
+the patch file and that
+.I patch
+is attempting to intuit whether there is a patch in that text and, if so,
+what kind of patch it is.
+.SH CAVEATS
+.I Patch
+cannot tell if the line numbers are off in an ed script, and can only detect
+bad line numbers in a normal diff when it finds a \*(L"change\*(R" or
+a \*(L"delete\*(R" command.
+A context diff using fuzz factor 3 may have the same problem.
+Until a suitable interactive interface is added, you should probably do
+a context diff in these cases to see if the changes made sense.
+Of course, compiling without errors is a pretty good indication that the patch
+worked, but not always.
+.PP
+.I Patch
+usually produces the correct results, even when it has to do a lot of
+guessing.
+However, the results are guaranteed to be correct only when the patch is
+applied to exactly the same version of the file that the patch was
+generated from.
+.SH BUGS
+Could be smarter about partial matches, excessively \&deviant offsets and
+swapped code, but that would take an extra pass.
+.PP
+If code has been duplicated (for instance with #ifdef OLDCODE ... #else ...
+#endif),
+.I patch
+is incapable of patching both versions, and, if it works at all, will likely
+patch the wrong one, and tell you that it succeeded to boot.
+.PP
+If you apply a patch you've already applied,
+.I patch
+will think it is a reversed patch, and offer to un-apply the patch.
+This could be construed as a feature.
diff --git a/usr.bin/patch/patch.c b/usr.bin/patch/patch.c
new file mode 100644
index 0000000..0f91c5c
--- /dev/null
+++ b/usr.bin/patch/patch.c
@@ -0,0 +1,800 @@
+#ifndef lint
+static char sccsid[] = "@(#)patch.c	8.1 (Berkeley) 6/6/93";
+#endif not lint
+
+char rcsid[] =
+	"$Header: patch.c,v 2.0.1.4 87/02/16 14:00:04 lwall Exp $";
+
+/* patch - a program to apply diffs to original files
+ *
+ * Copyright 1986, Larry Wall
+ *
+ * This program may be copied as long as you don't try to make any
+ * money off of it, or pretend that you wrote it.
+ *
+ * $Log:	patch.c,v $
+ * Revision 2.0.1.4  87/02/16  14:00:04  lwall
+ * Short replacement caused spurious "Out of sync" message.
+ * 
+ * Revision 2.0.1.3  87/01/30  22:45:50  lwall
+ * Improved diagnostic on sync error.
+ * Moved do_ed_script() to pch.c.
+ * 
+ * Revision 2.0.1.2  86/11/21  09:39:15  lwall
+ * Fuzz factor caused offset of installed lines.
+ * 
+ * Revision 2.0.1.1  86/10/29  13:10:22  lwall
+ * Backwards search could terminate prematurely.
+ * 
+ * Revision 2.0  86/09/17  15:37:32  lwall
+ * Baseline for netwide release.
+ * 
+ * Revision 1.5  86/08/01  20:53:24  lwall
+ * Changed some %d's to %ld's.
+ * Linted.
+ * 
+ * Revision 1.4  86/08/01  19:17:29  lwall
+ * Fixes for machines that can't vararg.
+ * Added fuzz factor.
+ * Generalized -p.
+ * General cleanup.
+ * 
+ * 85/08/15 van%ucbmonet@berkeley
+ * Changes for 4.3bsd diff -c.
+ *
+ * Revision 1.3  85/03/26  15:07:43  lwall
+ * Frozen.
+ * 
+ * Revision 1.2.1.9  85/03/12  17:03:35  lwall
+ * Changed pfp->_file to fileno(pfp).
+ * 
+ * Revision 1.2.1.8  85/03/12  16:30:43  lwall
+ * Check i_ptr and i_womp to make sure they aren't null before freeing.
+ * Also allow ed output to be suppressed.
+ * 
+ * Revision 1.2.1.7  85/03/12  15:56:13  lwall
+ * Added -p option from jromine@uci-750a.
+ * 
+ * Revision 1.2.1.6  85/03/12  12:12:51  lwall
+ * Now checks for normalness of file to patch.
+ * 
+ * Revision 1.2.1.5  85/03/12  11:52:12  lwall
+ * Added -D (#ifdef) option from joe@fluke.
+ * 
+ * Revision 1.2.1.4  84/12/06  11:14:15  lwall
+ * Made smarter about SCCS subdirectories.
+ * 
+ * Revision 1.2.1.3  84/12/05  11:18:43  lwall
+ * Added -l switch to do loose string comparison.
+ * 
+ * Revision 1.2.1.2  84/12/04  09:47:13  lwall
+ * Failed hunk count not reset on multiple patch file.
+ * 
+ * Revision 1.2.1.1  84/12/04  09:42:37  lwall
+ * Branch for sdcrdcf changes.
+ * 
+ * Revision 1.2  84/11/29  13:29:51  lwall
+ * Linted.  Identifiers uniqified.  Fixed i_ptr malloc() bug.  Fixed
+ * multiple calls to mktemp().  Will now work on machines that can only
+ * read 32767 chars.  Added -R option for diffs with new and old swapped.
+ * Various cosmetic changes.
+ * 
+ * Revision 1.1  84/11/09  17:03:58  lwall
+ * Initial revision
+ * 
+ */
+
+#include "INTERN.h"
+#include "common.h"
+#include "EXTERN.h"
+#include "version.h"
+#include "util.h"
+#include "pch.h"
+#include "inp.h"
+
+/* procedures */
+
+void reinitialize_almost_everything();
+void get_some_switches();
+LINENUM locate_hunk();
+void abort_hunk();
+void apply_hunk();
+void init_output();
+void init_reject();
+void copy_till();
+void spew_output();
+void dump_line();
+bool patch_match();
+bool similar();
+void re_input();
+void my_exit();
+
+/* Apply a set of diffs as appropriate. */
+
+main(argc,argv)
+int argc;
+char **argv;
+{
+    LINENUM where;
+    LINENUM newwhere;
+    LINENUM fuzz;
+    LINENUM mymaxfuzz;
+    int hunk = 0;
+    int failed = 0;
+    int i;
+
+    setbuf(stderr, serrbuf);
+    for (i = 0; i<MAXFILEC; i++)
+	filearg[i] = Nullch;
+    Mktemp(TMPOUTNAME);
+    Mktemp(TMPINNAME);
+    Mktemp(TMPREJNAME);
+    Mktemp(TMPPATNAME);
+
+    /* parse switches */
+    Argc = argc;
+    Argv = argv;
+    get_some_switches();
+    
+    /* make sure we clean up /tmp in case of disaster */
+    set_signals();
+
+    for (
+	open_patch_file(filearg[1]);
+	there_is_another_patch();
+	reinitialize_almost_everything()
+    ) {					/* for each patch in patch file */
+
+	if (outname == Nullch)
+	    outname = savestr(filearg[0]);
+    
+	/* initialize the patched file */
+	if (!skip_rest_of_patch)
+	    init_output(TMPOUTNAME);
+    
+	/* for ed script just up and do it and exit */
+	if (diff_type == ED_DIFF) {
+	    do_ed_script();
+	    continue;
+	}
+    
+	/* initialize reject file */
+	init_reject(TMPREJNAME);
+    
+	/* find out where all the lines are */
+	if (!skip_rest_of_patch)
+	    scan_input(filearg[0]);
+    
+	/* from here on, open no standard i/o files, because malloc */
+	/* might misfire and we can't catch it easily */
+    
+	/* apply each hunk of patch */
+	hunk = 0;
+	failed = 0;
+	out_of_mem = FALSE;
+	while (another_hunk()) {
+	    hunk++;
+	    fuzz = Nulline;
+	    mymaxfuzz = pch_context();
+	    if (maxfuzz < mymaxfuzz)
+		mymaxfuzz = maxfuzz;
+	    if (!skip_rest_of_patch) {
+		do {
+		    where = locate_hunk(fuzz);
+		    if (hunk == 1 && where == Nulline && !force) {
+						/* dwim for reversed patch? */
+			if (!pch_swap()) {
+			    if (fuzz == Nulline)
+				say1("\
+Not enough memory to try swapped hunk!  Assuming unswapped.\n");
+			    continue;
+			}
+			reverse = !reverse;
+			where = locate_hunk(fuzz);  /* try again */
+			if (where == Nulline) {	    /* didn't find it swapped */
+			    if (!pch_swap())         /* put it back to normal */
+				fatal1("Lost hunk on alloc error!\n");
+			    reverse = !reverse;
+			}
+			else if (noreverse) {
+			    if (!pch_swap())         /* put it back to normal */
+				fatal1("Lost hunk on alloc error!\n");
+			    reverse = !reverse;
+			    say1("\
+Ignoring previously applied (or reversed) patch.\n");
+			    skip_rest_of_patch = TRUE;
+			}
+			else {
+			    ask3("\
+%seversed (or previously applied) patch detected!  %s -R? [y] ",
+				reverse ? "R" : "Unr",
+				reverse ? "Assume" : "Ignore");
+			    if (*buf == 'n') {
+				ask1("Apply anyway? [n] ");
+				if (*buf != 'y')
+				    skip_rest_of_patch = TRUE;
+				where = Nulline;
+				reverse = !reverse;
+				if (!pch_swap())  /* put it back to normal */
+				    fatal1("Lost hunk on alloc error!\n");
+			    }
+			}
+		    }
+		} while (!skip_rest_of_patch && where == Nulline &&
+		    ++fuzz <= mymaxfuzz);
+
+		if (skip_rest_of_patch) {		/* just got decided */
+		    Fclose(ofp);
+		    ofp = Nullfp;
+		}
+	    }
+
+	    newwhere = pch_newfirst() + last_offset;
+	    if (skip_rest_of_patch) {
+		abort_hunk();
+		failed++;
+		if (verbose)
+		    say3("Hunk #%d ignored at %ld.\n", hunk, newwhere);
+	    }
+	    else if (where == Nulline) {
+		abort_hunk();
+		failed++;
+		if (verbose)
+		    say3("Hunk #%d failed at %ld.\n", hunk, newwhere);
+	    }
+	    else {
+		apply_hunk(where);
+		if (verbose) {
+		    say3("Hunk #%d succeeded at %ld", hunk, newwhere);
+		    if (fuzz)
+			say2(" with fuzz %ld", fuzz);
+		    if (last_offset)
+			say3(" (offset %ld line%s)",
+			    last_offset, last_offset==1L?"":"s");
+		    say1(".\n");
+		}
+	    }
+	}
+
+	if (out_of_mem && using_plan_a) {
+	    Argc = Argc_last;
+	    Argv = Argv_last;
+	    say1("\n\nRan out of memory using Plan A--trying again...\n\n");
+	    continue;
+	}
+    
+	assert(hunk);
+    
+	/* finish spewing out the new file */
+	if (!skip_rest_of_patch)
+	    spew_output();
+	
+	/* and put the output where desired */
+	ignore_signals();
+	if (!skip_rest_of_patch) {
+	    if (move_file(TMPOUTNAME, outname) < 0) {
+		toutkeep = TRUE;
+		chmod(TMPOUTNAME, filemode);
+	    }
+	    else
+		chmod(outname, filemode);
+	}
+	Fclose(rejfp);
+	rejfp = Nullfp;
+	if (failed) {
+	    if (!*rejname) {
+		Strcpy(rejname, outname);
+		Strcat(rejname, ".rej");
+	    }
+	    if (skip_rest_of_patch) {
+		say4("%d out of %d hunks ignored--saving rejects to %s\n",
+		    failed, hunk, rejname);
+	    }
+	    else {
+		say4("%d out of %d hunks failed--saving rejects to %s\n",
+		    failed, hunk, rejname);
+	    }
+	    if (move_file(TMPREJNAME, rejname) < 0)
+		trejkeep = TRUE;
+	}
+	set_signals();
+    }
+    my_exit(0);
+}
+
+/* Prepare to find the next patch to do in the patch file. */
+
+void
+reinitialize_almost_everything()
+{
+    re_patch();
+    re_input();
+
+    input_lines = 0;
+    last_frozen_line = 0;
+
+    filec = 0;
+    if (filearg[0] != Nullch && !out_of_mem) {
+	free(filearg[0]);
+	filearg[0] = Nullch;
+    }
+
+    if (outname != Nullch) {
+	free(outname);
+	outname = Nullch;
+    }
+
+    last_offset = 0;
+
+    diff_type = 0;
+
+    if (revision != Nullch) {
+	free(revision);
+	revision = Nullch;
+    }
+
+    reverse = FALSE;
+    skip_rest_of_patch = FALSE;
+
+    get_some_switches();
+
+    if (filec >= 2)
+	fatal1("You may not change to a different patch file.\n");
+}
+
+/* Process switches and filenames up to next '+' or end of list. */
+
+void
+get_some_switches()
+{
+    Reg1 char *s;
+
+    rejname[0] = '\0';
+    Argc_last = Argc;
+    Argv_last = Argv;
+    if (!Argc)
+	return;
+    for (Argc--,Argv++; Argc; Argc--,Argv++) {
+	s = Argv[0];
+	if (strEQ(s, "+")) {
+	    return;			/* + will be skipped by for loop */
+	}
+	if (*s != '-' || !s[1]) {
+	    if (filec == MAXFILEC)
+		fatal1("Too many file arguments.\n");
+	    filearg[filec++] = savestr(s);
+	}
+	else {
+	    switch (*++s) {
+	    case 'b':
+		origext = savestr(Argv[1]);
+		Argc--,Argv++;
+		break;
+	    case 'c':
+		diff_type = CONTEXT_DIFF;
+		break;
+	    case 'd':
+		if (!*++s) {
+		    Argc--,Argv++;
+		    s = Argv[0];
+		}
+		if (chdir(s) < 0)
+		    fatal2("Can't cd to %s.\n", s);
+		break;
+	    case 'D':
+	    	do_defines = TRUE;
+		if (!*++s) {
+		    Argc--,Argv++;
+		    s = Argv[0];
+		}
+		Sprintf(if_defined, "#ifdef %s\n", s);
+		Sprintf(not_defined, "#ifndef %s\n", s);
+		Sprintf(end_defined, "#endif /* %s */\n", s);
+		break;
+	    case 'e':
+		diff_type = ED_DIFF;
+		break;
+	    case 'f':
+		force = TRUE;
+		break;
+	    case 'F':
+		if (*++s == '=')
+		    s++;
+		maxfuzz = atoi(s);
+		break;
+	    case 'l':
+		canonicalize = TRUE;
+		break;
+	    case 'n':
+		diff_type = NORMAL_DIFF;
+		break;
+	    case 'N':
+		noreverse = TRUE;
+		break;
+	    case 'o':
+		outname = savestr(Argv[1]);
+		Argc--,Argv++;
+		break;
+	    case 'p':
+		if (*++s == '=')
+		    s++;
+		strippath = atoi(s);
+		break;
+	    case 'r':
+		Strcpy(rejname, Argv[1]);
+		Argc--,Argv++;
+		break;
+	    case 'R':
+		reverse = TRUE;
+		break;
+	    case 's':
+		verbose = FALSE;
+		break;
+	    case 'S':
+		skip_rest_of_patch = TRUE;
+		break;
+	    case 'v':
+		version();
+		break;
+#ifdef DEBUGGING
+	    case 'x':
+		debug = atoi(s+1);
+		break;
+#endif
+	    default:
+		fatal2("Unrecognized switch: %s\n", Argv[0]);
+	    }
+	}
+    }
+}
+
+/* Attempt to find the right place to apply this hunk of patch. */
+
+LINENUM
+locate_hunk(fuzz)
+LINENUM fuzz;
+{
+    Reg1 LINENUM first_guess = pch_first() + last_offset;
+    Reg2 LINENUM offset;
+    LINENUM pat_lines = pch_ptrn_lines();
+    Reg3 LINENUM max_pos_offset = input_lines - first_guess
+				- pat_lines + 1; 
+    Reg4 LINENUM max_neg_offset = first_guess - last_frozen_line - 1
+				+ pch_context();
+
+    if (!pat_lines)			/* null range matches always */
+	return first_guess;
+    if (max_neg_offset >= first_guess)	/* do not try lines < 0 */
+	max_neg_offset = first_guess - 1;
+    if (first_guess <= input_lines && patch_match(first_guess, Nulline, fuzz))
+	return first_guess;
+    for (offset = 1; ; offset++) {
+	Reg5 bool check_after = (offset <= max_pos_offset);
+	Reg6 bool check_before = (offset <= max_neg_offset);
+
+	if (check_after && patch_match(first_guess, offset, fuzz)) {
+#ifdef DEBUGGING
+	    if (debug & 1)
+		say3("Offset changing from %ld to %ld\n", last_offset, offset);
+#endif
+	    last_offset = offset;
+	    return first_guess+offset;
+	}
+	else if (check_before && patch_match(first_guess, -offset, fuzz)) {
+#ifdef DEBUGGING
+	    if (debug & 1)
+		say3("Offset changing from %ld to %ld\n", last_offset, -offset);
+#endif
+	    last_offset = -offset;
+	    return first_guess-offset;
+	}
+	else if (!check_before && !check_after)
+	    return Nulline;
+    }
+}
+
+/* We did not find the pattern, dump out the hunk so they can handle it. */
+
+void
+abort_hunk()
+{
+    Reg1 LINENUM i;
+    Reg2 LINENUM pat_end = pch_end();
+    /* add in last_offset to guess the same as the previous successful hunk */
+    LINENUM oldfirst = pch_first() + last_offset;
+    LINENUM newfirst = pch_newfirst() + last_offset;
+    LINENUM oldlast = oldfirst + pch_ptrn_lines() - 1;
+    LINENUM newlast = newfirst + pch_repl_lines() - 1;
+    char *stars = (diff_type == NEW_CONTEXT_DIFF ? " ****" : "");
+    char *minuses = (diff_type == NEW_CONTEXT_DIFF ? " ----" : " -----");
+
+    fprintf(rejfp, "***************\n");
+    for (i=0; i<=pat_end; i++) {
+	switch (pch_char(i)) {
+	case '*':
+	    if (oldlast < oldfirst)
+		fprintf(rejfp, "*** 0%s\n", stars);
+	    else if (oldlast == oldfirst)
+		fprintf(rejfp, "*** %ld%s\n", oldfirst, stars);
+	    else
+		fprintf(rejfp, "*** %ld,%ld%s\n", oldfirst, oldlast, stars);
+	    break;
+	case '=':
+	    if (newlast < newfirst)
+		fprintf(rejfp, "--- 0%s\n", minuses);
+	    else if (newlast == newfirst)
+		fprintf(rejfp, "--- %ld%s\n", newfirst, minuses);
+	    else
+		fprintf(rejfp, "--- %ld,%ld%s\n", newfirst, newlast, minuses);
+	    break;
+	case '\n':
+	    fprintf(rejfp, "%s", pfetch(i));
+	    break;
+	case ' ': case '-': case '+': case '!':
+	    fprintf(rejfp, "%c %s", pch_char(i), pfetch(i));
+	    break;
+	default:
+	    say1("Fatal internal error in abort_hunk().\n"); 
+	    abort();
+	}
+    }
+}
+
+/* We found where to apply it (we hope), so do it. */
+
+void
+apply_hunk(where)
+LINENUM where;
+{
+    Reg1 LINENUM old = 1;
+    Reg2 LINENUM lastline = pch_ptrn_lines();
+    Reg3 LINENUM new = lastline+1;
+#define OUTSIDE 0
+#define IN_IFNDEF 1
+#define IN_IFDEF 2
+#define IN_ELSE 3
+    Reg4 int def_state = OUTSIDE;
+    Reg5 bool R_do_defines = do_defines;
+    Reg6 LINENUM pat_end = pch_end();
+
+    where--;
+    while (pch_char(new) == '=' || pch_char(new) == '\n')
+	new++;
+    
+    while (old <= lastline) {
+	if (pch_char(old) == '-') {
+	    copy_till(where + old - 1);
+	    if (R_do_defines) {
+		if (def_state == OUTSIDE) {
+		    fputs(not_defined, ofp);
+		    def_state = IN_IFNDEF;
+		}
+		else if (def_state == IN_IFDEF) {
+		    fputs(else_defined, ofp);
+		    def_state = IN_ELSE;
+		}
+		fputs(pfetch(old), ofp);
+	    }
+	    last_frozen_line++;
+	    old++;
+	}
+	else if (new > pat_end)
+	    break;
+	else if (pch_char(new) == '+') {
+	    copy_till(where + old - 1);
+	    if (R_do_defines) {
+		if (def_state == IN_IFNDEF) {
+		    fputs(else_defined, ofp);
+		    def_state = IN_ELSE;
+		}
+		else if (def_state == OUTSIDE) {
+		    fputs(if_defined, ofp);
+		    def_state = IN_IFDEF;
+		}
+	    }
+	    fputs(pfetch(new), ofp);
+	    new++;
+	}
+	else {
+	    if (pch_char(new) != pch_char(old)) {
+		say3("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
+		    pch_hunk_beg() + old,
+		    pch_hunk_beg() + new);
+#ifdef DEBUGGING
+		say3("oldchar = '%c', newchar = '%c'\n",
+		    pch_char(old), pch_char(new));
+#endif
+		my_exit(1);
+	    }
+	    if (pch_char(new) == '!') {
+		copy_till(where + old - 1);
+		if (R_do_defines) {
+		   fputs(not_defined, ofp);
+		   def_state = IN_IFNDEF;
+		}
+		while (pch_char(old) == '!') {
+		    if (R_do_defines) {
+			fputs(pfetch(old), ofp);
+		    }
+		    last_frozen_line++;
+		    old++;
+		}
+		if (R_do_defines) {
+		    fputs(else_defined, ofp);
+		    def_state = IN_ELSE;
+		}
+		while (pch_char(new) == '!') {
+		    fputs(pfetch(new), ofp);
+		    new++;
+		}
+		if (R_do_defines) {
+		    fputs(end_defined, ofp);
+		    def_state = OUTSIDE;
+		}
+	    }
+	    else {
+		assert(pch_char(new) == ' ');
+		old++;
+		new++;
+	    }
+	}
+    }
+    if (new <= pat_end && pch_char(new) == '+') {
+	copy_till(where + old - 1);
+	if (R_do_defines) {
+	    if (def_state == OUTSIDE) {
+	    	fputs(if_defined, ofp);
+		def_state = IN_IFDEF;
+	    }
+	    else if (def_state == IN_IFNDEF) {
+		fputs(else_defined, ofp);
+		def_state = IN_ELSE;
+	    }
+	}
+	while (new <= pat_end && pch_char(new) == '+') {
+	    fputs(pfetch(new), ofp);
+	    new++;
+	}
+    }
+    if (R_do_defines && def_state != OUTSIDE) {
+	fputs(end_defined, ofp);
+    }
+}
+
+/* Open the new file. */
+
+void
+init_output(name)
+char *name;
+{
+    ofp = fopen(name, "w");
+    if (ofp == Nullfp)
+	fatal2("patch: can't create %s.\n", name);
+}
+
+/* Open a file to put hunks we can't locate. */
+
+void
+init_reject(name)
+char *name;
+{
+    rejfp = fopen(name, "w");
+    if (rejfp == Nullfp)
+	fatal2("patch: can't create %s.\n", name);
+}
+
+/* Copy input file to output, up to wherever hunk is to be applied. */
+
+void
+copy_till(lastline)
+Reg1 LINENUM lastline;
+{
+    Reg2 LINENUM R_last_frozen_line = last_frozen_line;
+
+    if (R_last_frozen_line > lastline)
+	say1("patch: misordered hunks! output will be garbled.\n");
+    while (R_last_frozen_line < lastline) {
+	dump_line(++R_last_frozen_line);
+    }
+    last_frozen_line = R_last_frozen_line;
+}
+
+/* Finish copying the input file to the output file. */
+
+void
+spew_output()
+{
+#ifdef DEBUGGING
+    if (debug & 256)
+	say3("il=%ld lfl=%ld\n",input_lines,last_frozen_line);
+#endif
+    if (input_lines)
+	copy_till(input_lines);		/* dump remainder of file */
+    Fclose(ofp);
+    ofp = Nullfp;
+}
+
+/* Copy one line from input to output. */
+
+void
+dump_line(line)
+LINENUM line;
+{
+    Reg1 char *s;
+    Reg2 char R_newline = '\n';
+
+    /* Note: string is not null terminated. */
+    for (s=ifetch(line, 0); putc(*s, ofp) != R_newline; s++) ;
+}
+
+/* Does the patch pattern match at line base+offset? */
+
+bool
+patch_match(base, offset, fuzz)
+LINENUM base;
+LINENUM offset;
+LINENUM fuzz;
+{
+    Reg1 LINENUM pline = 1 + fuzz;
+    Reg2 LINENUM iline;
+    Reg3 LINENUM pat_lines = pch_ptrn_lines() - fuzz;
+
+    for (iline=base+offset+fuzz; pline <= pat_lines; pline++,iline++) {
+	if (canonicalize) {
+	    if (!similar(ifetch(iline, (offset >= 0)),
+			 pfetch(pline),
+			 pch_line_len(pline) ))
+		return FALSE;
+	}
+	else if (strnNE(ifetch(iline, (offset >= 0)),
+		   pfetch(pline),
+		   pch_line_len(pline) ))
+	    return FALSE;
+    }
+    return TRUE;
+}
+
+/* Do two lines match with canonicalized white space? */
+
+bool
+similar(a,b,len)
+Reg1 char *a;
+Reg2 char *b;
+Reg3 int len;
+{
+    while (len) {
+	if (isspace(*b)) {		/* whitespace (or \n) to match? */
+	    if (!isspace(*a))		/* no corresponding whitespace? */
+		return FALSE;
+	    while (len && isspace(*b) && *b != '\n')
+		b++,len--;		/* skip pattern whitespace */
+	    while (isspace(*a) && *a != '\n')
+		a++;			/* skip target whitespace */
+	    if (*a == '\n' || *b == '\n')
+		return (*a == *b);	/* should end in sync */
+	}
+	else if (*a++ != *b++)		/* match non-whitespace chars */
+	    return FALSE;
+	else
+	    len--;			/* probably not necessary */
+    }
+    return TRUE;			/* actually, this is not reached */
+					/* since there is always a \n */
+}
+
+/* Exit with cleanup. */
+
+void
+my_exit(status)
+int status;
+{
+    Unlink(TMPINNAME);
+    if (!toutkeep) {
+	Unlink(TMPOUTNAME);
+    }
+    if (!trejkeep) {
+	Unlink(TMPREJNAME);
+    }
+    Unlink(TMPPATNAME);
+    exit(status);
+}
diff --git a/usr.bin/patch/pch.c b/usr.bin/patch/pch.c
new file mode 100644
index 0000000..8837212
--- /dev/null
+++ b/usr.bin/patch/pch.c
@@ -0,0 +1,1108 @@
+/* $Header: pch.c,v 2.0.1.6 87/06/04 16:18:13 lwall Exp $
+ *
+ * $Log:	pch.c,v $
+ * Revision 2.0.1.6  87/06/04  16:18:13  lwall
+ * pch_swap didn't swap p_bfake and p_efake.
+ * 
+ * Revision 2.0.1.5  87/01/30  22:47:42  lwall
+ * Improved responses to mangled patches.
+ * 
+ * Revision 2.0.1.4  87/01/05  16:59:53  lwall
+ * New-style context diffs caused double call to free().
+ * 
+ * Revision 2.0.1.3  86/11/14  10:08:33  lwall
+ * Fixed problem where a long pattern wouldn't grow the hunk.
+ * Also restored p_input_line when backtracking so error messages are right.
+ * 
+ * Revision 2.0.1.2  86/11/03  17:49:52  lwall
+ * New-style delete triggers spurious assertion error.
+ * 
+ * Revision 2.0.1.1  86/10/29  15:52:08  lwall
+ * Could falsely report new-style context diff.
+ * 
+ * Revision 2.0  86/09/17  15:39:37  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+#include "EXTERN.h"
+#include "common.h"
+#include "util.h"
+#include "INTERN.h"
+#include "pch.h"
+
+/* Patch (diff listing) abstract type. */
+
+static long p_filesize;			/* size of the patch file */
+static LINENUM p_first;			/* 1st line number */
+static LINENUM p_newfirst;		/* 1st line number of replacement */
+static LINENUM p_ptrn_lines;		/* # lines in pattern */
+static LINENUM p_repl_lines;		/* # lines in replacement text */
+static LINENUM p_end = -1;		/* last line in hunk */
+static LINENUM p_max;			/* max allowed value of p_end */
+static LINENUM p_context = 3;		/* # of context lines */
+static LINENUM p_input_line = 0;	/* current line # from patch file */
+static char **p_line = Null(char**);	/* the text of the hunk */
+static short *p_len = Null(short*);	/* length of each line */
+static char *p_char = Nullch;		/* +, -, and ! */
+static int hunkmax = INITHUNKMAX;	/* size of above arrays to begin with */
+static int p_indent;			/* indent to patch */
+static LINENUM p_base;			/* where to intuit this time */
+static LINENUM p_bline;			/* line # of p_base */
+static LINENUM p_start;			/* where intuit found a patch */
+static LINENUM p_sline;			/* and the line number for it */
+static LINENUM p_hunk_beg;		/* line number of current hunk */
+static LINENUM p_efake = -1;		/* end of faked up lines--don't free */
+static LINENUM p_bfake = -1;		/* beg of faked up lines */
+
+/* Prepare to look for the next patch in the patch file. */
+
+void
+re_patch()
+{
+    p_first = Nulline;
+    p_newfirst = Nulline;
+    p_ptrn_lines = Nulline;
+    p_repl_lines = Nulline;
+    p_end = (LINENUM)-1;
+    p_max = Nulline;
+    p_indent = 0;
+}
+
+/* Open the patch file at the beginning of time. */
+
+void
+open_patch_file(filename)
+char *filename;
+{
+    if (filename == Nullch || !*filename || strEQ(filename, "-")) {
+	pfp = fopen(TMPPATNAME, "w");
+	if (pfp == Nullfp)
+	    fatal2("patch: can't create %s.\n", TMPPATNAME);
+	while (fgets(buf, sizeof buf, stdin) != Nullch)
+	    fputs(buf, pfp);
+	Fclose(pfp);
+	filename = TMPPATNAME;
+    }
+    pfp = fopen(filename, "r");
+    if (pfp == Nullfp)
+	fatal2("patch file %s not found\n", filename);
+    Fstat(fileno(pfp), &filestat);
+    p_filesize = filestat.st_size;
+    next_intuit_at(0L,1L);			/* start at the beginning */
+    set_hunkmax();
+}
+
+/* Make sure our dynamically realloced tables are malloced to begin with. */
+
+void
+set_hunkmax()
+{
+#ifndef lint
+    if (p_line == Null(char**))
+	p_line = (char**) malloc((MEM)hunkmax * sizeof(char *));
+    if (p_len == Null(short*))
+	p_len  = (short*) malloc((MEM)hunkmax * sizeof(short));
+#endif
+    if (p_char == Nullch)
+	p_char = (char*)  malloc((MEM)hunkmax * sizeof(char));
+}
+
+/* Enlarge the arrays containing the current hunk of patch. */
+
+void
+grow_hunkmax()
+{
+    hunkmax *= 2;
+    /* 
+     * Note that on most systems, only the p_line array ever gets fresh memory
+     * since p_len can move into p_line's old space, and p_char can move into
+     * p_len's old space.  Not on PDP-11's however.  But it doesn't matter.
+     */
+    assert(p_line != Null(char**) && p_len != Null(short*) && p_char != Nullch);
+#ifndef lint
+    p_line = (char**) realloc((char*)p_line, (MEM)hunkmax * sizeof(char *));
+    p_len  = (short*) realloc((char*)p_len,  (MEM)hunkmax * sizeof(short));
+    p_char = (char*)  realloc((char*)p_char, (MEM)hunkmax * sizeof(char));
+#endif
+    if (p_line != Null(char**) && p_len != Null(short*) && p_char != Nullch)
+	return;
+    if (!using_plan_a)
+	fatal1("patch: out of memory (grow_hunkmax)\n");
+    out_of_mem = TRUE;		/* whatever is null will be allocated again */
+				/* from within plan_a(), of all places */
+}
+
+/* True if the remainder of the patch file contains a diff of some sort. */
+
+bool
+there_is_another_patch()
+{
+    if (p_base != 0L && p_base >= p_filesize) {
+	if (verbose)
+	    say1("done\n");
+	return FALSE;
+    }
+    if (verbose)
+	say1("Hmm...");
+    diff_type = intuit_diff_type();
+    if (!diff_type) {
+	if (p_base != 0L) {
+	    if (verbose)
+		say1("  Ignoring the trailing garbage.\ndone\n");
+	}
+	else
+	    say1("  I can't seem to find a patch in there anywhere.\n");
+	return FALSE;
+    }
+    if (verbose)
+	say3("  %sooks like %s to me...\n",
+	    (p_base == 0L ? "L" : "The next patch l"),
+	    diff_type == CONTEXT_DIFF ? "a context diff" :
+	    diff_type == NEW_CONTEXT_DIFF ? "a new-style context diff" :
+	    diff_type == NORMAL_DIFF ? "a normal diff" :
+	    "an ed script" );
+    if (p_indent && verbose)
+	say3("(Patch is indented %d space%s.)\n", p_indent, p_indent==1?"":"s");
+    skip_to(p_start,p_sline);
+    while (filearg[0] == Nullch) {
+	if (force) {
+	    say1("No file to patch.  Skipping...\n");
+	    filearg[0] = savestr(bestguess);
+	    return TRUE;
+	}
+	ask1("File to patch: ");
+	if (*buf != '\n') {
+	    if (bestguess)
+		free(bestguess);
+	    bestguess = savestr(buf);
+	    filearg[0] = fetchname(buf, 0, FALSE);
+	}
+	if (filearg[0] == Nullch) {
+	    ask1("No file found--skip this patch? [n] ");
+	    if (*buf != 'y') {
+		continue;
+	    }
+	    if (verbose)
+		say1("Skipping patch...\n");
+	    filearg[0] = fetchname(bestguess, 0, TRUE);
+	    skip_rest_of_patch = TRUE;
+	    return TRUE;
+	}
+    }
+    return TRUE;
+}
+
+/* Determine what kind of diff is in the remaining part of the patch file. */
+
+int
+intuit_diff_type()
+{
+    Reg4 long this_line = 0;
+    Reg5 long previous_line;
+    Reg6 long first_command_line = -1;
+    long fcl_line;
+    Reg7 bool last_line_was_command = FALSE;
+    Reg8 bool this_is_a_command = FALSE;
+    Reg9 bool stars_last_line = FALSE;
+    Reg10 bool stars_this_line = FALSE;
+    Reg3 int indent;
+    Reg1 char *s;
+    Reg2 char *t;
+    char *indtmp = Nullch;
+    char *oldtmp = Nullch;
+    char *newtmp = Nullch;
+    char *indname = Nullch;
+    char *oldname = Nullch;
+    char *newname = Nullch;
+    Reg11 int retval;
+    bool no_filearg = (filearg[0] == Nullch);
+
+    ok_to_create_file = FALSE;
+    Fseek(pfp, p_base, 0);
+    p_input_line = p_bline - 1;
+    for (;;) {
+	previous_line = this_line;
+	last_line_was_command = this_is_a_command;
+	stars_last_line = stars_this_line;
+	this_line = ftell(pfp);
+	indent = 0;
+	p_input_line++;
+	if (fgets(buf, sizeof buf, pfp) == Nullch) {
+	    if (first_command_line >= 0L) {
+					/* nothing but deletes!? */
+		p_start = first_command_line;
+		p_sline = fcl_line;
+		retval = ED_DIFF;
+		goto scan_exit;
+	    }
+	    else {
+		p_start = this_line;
+		p_sline = p_input_line;
+		retval = 0;
+		goto scan_exit;
+	    }
+	}
+	for (s = buf; *s == ' ' || *s == '\t'; s++) {
+	    if (*s == '\t')
+		indent += 8 - (indent % 8);
+	    else
+		indent++;
+	}
+	for (t=s; isdigit(*t) || *t == ','; t++) ; 
+	this_is_a_command = (isdigit(*s) &&
+	  (*t == 'd' || *t == 'c' || *t == 'a') );
+	if (first_command_line < 0L && this_is_a_command) { 
+	    first_command_line = this_line;
+	    fcl_line = p_input_line;
+	    p_indent = indent;		/* assume this for now */
+	}
+	if (!stars_last_line && strnEQ(s, "*** ", 4))
+	    oldtmp = savestr(s+4);
+	else if (strnEQ(s, "--- ", 4))
+	    newtmp = savestr(s+4);
+	else if (strnEQ(s, "Index:", 6))
+	    indtmp = savestr(s+6);
+	else if (strnEQ(s, "Prereq:", 7)) {
+	    for (t=s+7; isspace(*t); t++) ;
+	    revision = savestr(t);
+	    for (t=revision; *t && !isspace(*t); t++) ;
+	    *t = '\0';
+	    if (!*revision) {
+		free(revision);
+		revision = Nullch;
+	    }
+	}
+	if ((!diff_type || diff_type == ED_DIFF) &&
+	  first_command_line >= 0L &&
+	  strEQ(s, ".\n") ) {
+	    p_indent = indent;
+	    p_start = first_command_line;
+	    p_sline = fcl_line;
+	    retval = ED_DIFF;
+	    goto scan_exit;
+	}
+	stars_this_line = strnEQ(s, "********", 8);
+	if ((!diff_type || diff_type == CONTEXT_DIFF) && stars_last_line &&
+		 strnEQ(s, "*** ", 4)) {
+	    if (!atol(s+4))
+		ok_to_create_file = TRUE;
+	    /* if this is a new context diff the character just before */
+	    /* the newline is a '*'. */
+	    while (*s != '\n')
+		s++;
+	    p_indent = indent;
+	    p_start = previous_line;
+	    p_sline = p_input_line - 1;
+	    retval = (*(s-1) == '*' ? NEW_CONTEXT_DIFF : CONTEXT_DIFF);
+	    goto scan_exit;
+	}
+	if ((!diff_type || diff_type == NORMAL_DIFF) && 
+	  last_line_was_command &&
+	  (strnEQ(s, "< ", 2) || strnEQ(s, "> ", 2)) ) {
+	    p_start = previous_line;
+	    p_sline = p_input_line - 1;
+	    p_indent = indent;
+	    retval = NORMAL_DIFF;
+	    goto scan_exit;
+	}
+    }
+  scan_exit:
+    if (no_filearg) {
+	if (indtmp != Nullch)
+	    indname = fetchname(indtmp, strippath, ok_to_create_file);
+	if (oldtmp != Nullch)
+	    oldname = fetchname(oldtmp, strippath, ok_to_create_file);
+	if (newtmp != Nullch)
+	    newname = fetchname(newtmp, strippath, ok_to_create_file);
+	if (oldname && newname) {
+	    if (strlen(oldname) < strlen(newname))
+		filearg[0] = savestr(oldname);
+	    else
+		filearg[0] = savestr(newname);
+	}
+	else if (oldname)
+	    filearg[0] = savestr(oldname);
+	else if (newname)
+	    filearg[0] = savestr(newname);
+	else if (indname)
+	    filearg[0] = savestr(indname);
+    }
+    if (bestguess) {
+	free(bestguess);
+	bestguess = Nullch;
+    }
+    if (filearg[0] != Nullch)
+	bestguess = savestr(filearg[0]);
+    else if (indtmp != Nullch)
+	bestguess = fetchname(indtmp, strippath, TRUE);
+    else {
+	if (oldtmp != Nullch)
+	    oldname = fetchname(oldtmp, strippath, TRUE);
+	if (newtmp != Nullch)
+	    newname = fetchname(newtmp, strippath, TRUE);
+	if (oldname && newname) {
+	    if (strlen(oldname) < strlen(newname))
+		bestguess = savestr(oldname);
+	    else
+		bestguess = savestr(newname);
+	}
+	else if (oldname)
+	    bestguess = savestr(oldname);
+	else if (newname)
+	    bestguess = savestr(newname);
+    }
+    if (indtmp != Nullch)
+	free(indtmp);
+    if (oldtmp != Nullch)
+	free(oldtmp);
+    if (newtmp != Nullch)
+	free(newtmp);
+    if (indname != Nullch)
+	free(indname);
+    if (oldname != Nullch)
+	free(oldname);
+    if (newname != Nullch)
+	free(newname);
+    return retval;
+}
+
+/* Remember where this patch ends so we know where to start up again. */
+
+void
+next_intuit_at(file_pos,file_line)
+long file_pos;
+long file_line;
+{
+    p_base = file_pos;
+    p_bline = file_line;
+}
+
+/* Basically a verbose fseek() to the actual diff listing. */
+
+void
+skip_to(file_pos,file_line)
+long file_pos;
+long file_line;
+{
+    char *ret;
+
+    assert(p_base <= file_pos);
+    if (verbose && p_base < file_pos) {
+	Fseek(pfp, p_base, 0);
+	say1("The text leading up to this was:\n--------------------------\n");
+	while (ftell(pfp) < file_pos) {
+	    ret = fgets(buf, sizeof buf, pfp);
+	    assert(ret != Nullch);
+	    say2("|%s", buf);
+	}
+	say1("--------------------------\n");
+    }
+    else
+	Fseek(pfp, file_pos, 0);
+    p_input_line = file_line - 1;
+}
+
+/* True if there is more of the current diff listing to process. */
+
+bool
+another_hunk()
+{
+    Reg1 char *s;
+    Reg8 char *ret;
+    Reg2 int context = 0;
+
+    while (p_end >= 0) {
+	if (p_end == p_efake)
+	    p_end = p_bfake;		/* don't free twice */
+	else
+	    free(p_line[p_end]);
+	p_end--;
+    }
+    assert(p_end == -1);
+    p_efake = -1;
+
+    p_max = hunkmax;			/* gets reduced when --- found */
+    if (diff_type == CONTEXT_DIFF || diff_type == NEW_CONTEXT_DIFF) {
+	long line_beginning = ftell(pfp);
+					/* file pos of the current line */
+	LINENUM repl_beginning = 0;	/* index of --- line */
+	Reg4 LINENUM fillcnt = 0;	/* #lines of missing ptrn or repl */
+	Reg5 LINENUM fillsrc;		/* index of first line to copy */
+	Reg6 LINENUM filldst;		/* index of first missing line */
+	bool ptrn_spaces_eaten = FALSE;	/* ptrn was slightly misformed */
+	Reg9 bool repl_could_be_missing = TRUE;
+					/* no + or ! lines in this hunk */
+	bool repl_missing = FALSE;	/* we are now backtracking */
+	long repl_backtrack_position = 0;
+					/* file pos of first repl line */
+	LINENUM repl_patch_line;	/* input line number for same */
+	Reg7 LINENUM ptrn_copiable = 0;
+					/* # of copiable lines in ptrn */
+
+	ret = pgets(buf, sizeof buf, pfp);
+	p_input_line++;
+	if (ret == Nullch || strnNE(buf, "********", 8)) {
+	    next_intuit_at(line_beginning,p_input_line);
+	    return FALSE;
+	}
+	p_context = 100;
+	p_hunk_beg = p_input_line + 1;
+	while (p_end < p_max) {
+	    line_beginning = ftell(pfp);
+	    ret = pgets(buf, sizeof buf, pfp);
+	    p_input_line++;
+	    if (ret == Nullch) {
+		if (p_max - p_end < 4)
+		    Strcpy(buf, "  \n");  /* assume blank lines got chopped */
+		else {
+		    if (repl_beginning && repl_could_be_missing) {
+			repl_missing = TRUE;
+			goto hunk_done;
+		    }
+		    fatal1("Unexpected end of file in patch.\n");
+		}
+	    }
+	    p_end++;
+	    assert(p_end < hunkmax);
+	    p_char[p_end] = *buf;
+	    p_line[p_end] = Nullch;
+	    switch (*buf) {
+	    case '*':
+		if (strnEQ(buf, "********", 8)) {
+		    if (repl_beginning && repl_could_be_missing) {
+			repl_missing = TRUE;
+			goto hunk_done;
+		    }
+		    else
+			fatal2("Unexpected end of hunk at line %ld.\n",
+			    p_input_line);
+		}
+		if (p_end != 0) {
+		    if (repl_beginning && repl_could_be_missing) {
+			repl_missing = TRUE;
+			goto hunk_done;
+		    }
+		    fatal3("Unexpected *** at line %ld: %s", p_input_line, buf);
+		}
+		context = 0;
+		p_line[p_end] = savestr(buf);
+		if (out_of_mem) {
+		    p_end--;
+		    return FALSE;
+		}
+		for (s=buf; *s && !isdigit(*s); s++) ;
+		if (!*s)
+		    goto malformed;
+		p_first = (LINENUM) atol(s);
+		while (isdigit(*s)) s++;
+		if (*s == ',') {
+		    for (; *s && !isdigit(*s); s++) ;
+		    if (!*s)
+			goto malformed;
+		    p_ptrn_lines = ((LINENUM)atol(s)) - p_first + 1;
+		}
+		else if (p_first)
+		    p_ptrn_lines = 1;
+		else {
+		    p_ptrn_lines = 0;
+		    p_first = 1;
+		}
+		p_max = p_ptrn_lines + 6;	/* we need this much at least */
+		while (p_max >= hunkmax)
+		    grow_hunkmax();
+		p_max = hunkmax;
+		break;
+	    case '-':
+		if (buf[1] == '-') {
+		    if (repl_beginning ||
+			(p_end != p_ptrn_lines + 1 + (p_char[p_end-1] == '\n')))
+		    {
+			if (p_end == 1) {
+			    /* `old' lines were omitted - set up to fill */
+			    /* them in from 'new' context lines. */
+			    p_end = p_ptrn_lines + 1;
+			    fillsrc = p_end + 1;
+			    filldst = 1;
+			    fillcnt = p_ptrn_lines;
+			}
+			else {
+			    if (repl_beginning) {
+				if (repl_could_be_missing){
+				    repl_missing = TRUE;
+				    goto hunk_done;
+				}
+				fatal3(
+"Duplicate \"---\" at line %ld--check line numbers at line %ld.\n",
+				    p_input_line, p_hunk_beg + repl_beginning);
+			    }
+			    else {
+				fatal4(
+"%s \"---\" at line %ld--check line numbers at line %ld.\n",
+				    (p_end <= p_ptrn_lines
+					? "Premature"
+					: "Overdue" ),
+				    p_input_line, p_hunk_beg);
+			    }
+			}
+		    }
+		    repl_beginning = p_end;
+		    repl_backtrack_position = ftell(pfp);
+		    repl_patch_line = p_input_line;
+		    p_line[p_end] = savestr(buf);
+		    if (out_of_mem) {
+			p_end--;
+			return FALSE;
+		    }
+		    p_char[p_end] = '=';
+		    for (s=buf; *s && !isdigit(*s); s++) ;
+		    if (!*s)
+			goto malformed;
+		    p_newfirst = (LINENUM) atol(s);
+		    while (isdigit(*s)) s++;
+		    if (*s == ',') {
+			for (; *s && !isdigit(*s); s++) ;
+			if (!*s)
+			    goto malformed;
+			p_repl_lines = ((LINENUM)atol(s)) - p_newfirst + 1;
+		    }
+		    else if (p_newfirst)
+			p_repl_lines = 1;
+		    else {
+			p_repl_lines = 0;
+			p_newfirst = 1;
+		    }
+		    p_max = p_repl_lines + p_end;
+		    if (p_max > MAXHUNKSIZE)
+			fatal4("Hunk too large (%ld lines) at line %ld: %s",
+			      p_max, p_input_line, buf);
+		    while (p_max >= hunkmax)
+			grow_hunkmax();
+		    if (p_repl_lines != ptrn_copiable)
+			repl_could_be_missing = FALSE;
+		    break;
+		}
+		goto change_line;
+	    case '+':  case '!':
+		repl_could_be_missing = FALSE;
+	      change_line:
+		if (!isspace(buf[1]) && buf[1] != '>' && buf[1] != '<' &&
+		  repl_beginning && repl_could_be_missing) {
+		    repl_missing = TRUE;
+		    goto hunk_done;
+		}
+		if (context > 0) {
+		    if (context < p_context)
+			p_context = context;
+		    context = -1000;
+		}
+		p_line[p_end] = savestr(buf+2);
+		if (out_of_mem) {
+		    p_end--;
+		    return FALSE;
+		}
+		break;
+	    case '\t': case '\n':	/* assume the 2 spaces got eaten */
+		if (repl_beginning && repl_could_be_missing &&
+		  (!ptrn_spaces_eaten || diff_type == NEW_CONTEXT_DIFF) ) {
+		    repl_missing = TRUE;
+		    goto hunk_done;
+		}
+		p_line[p_end] = savestr(buf);
+		if (out_of_mem) {
+		    p_end--;
+		    return FALSE;
+		}
+		if (p_end != p_ptrn_lines + 1) {
+		    ptrn_spaces_eaten |= (repl_beginning != 0);
+		    context++;
+		    if (!repl_beginning)
+			ptrn_copiable++;
+		    p_char[p_end] = ' ';
+		}
+		break;
+	    case ' ':
+		if (!isspace(buf[1]) &&
+		  repl_beginning && repl_could_be_missing) {
+		    repl_missing = TRUE;
+		    goto hunk_done;
+		}
+		context++;
+		if (!repl_beginning)
+		    ptrn_copiable++;
+		p_line[p_end] = savestr(buf+2);
+		if (out_of_mem) {
+		    p_end--;
+		    return FALSE;
+		}
+		break;
+	    default:
+		if (repl_beginning && repl_could_be_missing) {
+		    repl_missing = TRUE;
+		    goto hunk_done;
+		}
+		goto malformed;
+	    }
+	    /* set up p_len for strncmp() so we don't have to */
+	    /* assume null termination */
+	    if (p_line[p_end])
+		p_len[p_end] = strlen(p_line[p_end]);
+	    else
+		p_len[p_end] = 0;
+	}
+	
+    hunk_done:
+	if (p_end >=0 && !repl_beginning)
+	    fatal2("No --- found in patch at line %ld\n", pch_hunk_beg());
+
+	if (repl_missing) {
+	    
+	    /* reset state back to just after --- */
+	    p_input_line = repl_patch_line;
+	    for (p_end--; p_end > repl_beginning; p_end--)
+		free(p_line[p_end]);
+	    Fseek(pfp, repl_backtrack_position, 0);
+	    
+	    /* redundant 'new' context lines were omitted - set */
+	    /* up to fill them in from the old file context */
+	    fillsrc = 1;
+	    filldst = repl_beginning+1;
+	    fillcnt = p_repl_lines;
+	    p_end = p_max;
+	}
+
+	if (diff_type == CONTEXT_DIFF &&
+	  (fillcnt || (p_first > 1 && ptrn_copiable > 2*p_context)) ) {
+	    if (verbose)
+		say1("\
+(Fascinating--this is really a new-style context diff but without the telltale\n\
+extra asterisks on the *** line that usually indicate the new style...)\n");
+	    diff_type = NEW_CONTEXT_DIFF;
+	}
+	
+	/* if there were omitted context lines, fill them in now */
+	if (fillcnt) {
+	    p_bfake = filldst;		/* remember where not to free() */
+	    p_efake = filldst + fillcnt - 1;
+	    while (fillcnt-- > 0) {
+		while (fillsrc <= p_end && p_char[fillsrc] != ' ')
+		    fillsrc++;
+		if (fillsrc > p_end)
+		    fatal2("Replacement text or line numbers mangled in hunk at line %ld\n",
+			p_hunk_beg);
+		p_line[filldst] = p_line[fillsrc];
+		p_char[filldst] = p_char[fillsrc];
+		p_len[filldst] = p_len[fillsrc];
+		fillsrc++; filldst++;
+	    }
+	    while (fillsrc <= p_end && fillsrc != repl_beginning &&
+	      p_char[fillsrc] != ' ')
+		fillsrc++;
+#ifdef DEBUGGING
+	    if (debug & 64)
+		printf("fillsrc %ld, filldst %ld, rb %ld, e+1 %ld\n",
+		    fillsrc,filldst,repl_beginning,p_end+1);
+#endif
+	    assert(fillsrc==p_end+1 || fillsrc==repl_beginning);
+	    assert(filldst==p_end+1 || filldst==repl_beginning);
+	}
+    }
+    else {				/* normal diff--fake it up */
+	char hunk_type;
+	Reg3 int i;
+	LINENUM min, max;
+	long line_beginning = ftell(pfp);
+
+	p_context = 0;
+	ret = pgets(buf, sizeof buf, pfp);
+	p_input_line++;
+	if (ret == Nullch || !isdigit(*buf)) {
+	    next_intuit_at(line_beginning,p_input_line);
+	    return FALSE;
+	}
+	p_first = (LINENUM)atol(buf);
+	for (s=buf; isdigit(*s); s++) ;
+	if (*s == ',') {
+	    p_ptrn_lines = (LINENUM)atol(++s) - p_first + 1;
+	    while (isdigit(*s)) s++;
+	}
+	else
+	    p_ptrn_lines = (*s != 'a');
+	hunk_type = *s;
+	if (hunk_type == 'a')
+	    p_first++;			/* do append rather than insert */
+	min = (LINENUM)atol(++s);
+	for (; isdigit(*s); s++) ;
+	if (*s == ',')
+	    max = (LINENUM)atol(++s);
+	else
+	    max = min;
+	if (hunk_type == 'd')
+	    min++;
+	p_end = p_ptrn_lines + 1 + max - min + 1;
+	if (p_end > MAXHUNKSIZE)
+	    fatal4("Hunk too large (%ld lines) at line %ld: %s",
+		  p_end, p_input_line, buf);
+	while (p_end >= hunkmax)
+	    grow_hunkmax();
+	p_newfirst = min;
+	p_repl_lines = max - min + 1;
+	Sprintf(buf, "*** %ld,%ld\n", p_first, p_first + p_ptrn_lines - 1);
+	p_line[0] = savestr(buf);
+	if (out_of_mem) {
+	    p_end = -1;
+	    return FALSE;
+	}
+	p_char[0] = '*';
+	for (i=1; i<=p_ptrn_lines; i++) {
+	    ret = pgets(buf, sizeof buf, pfp);
+	    p_input_line++;
+	    if (ret == Nullch)
+		fatal2("Unexpected end of file in patch at line %ld.\n",
+		  p_input_line);
+	    if (*buf != '<')
+		fatal2("< expected at line %ld of patch.\n", p_input_line);
+	    p_line[i] = savestr(buf+2);
+	    if (out_of_mem) {
+		p_end = i-1;
+		return FALSE;
+	    }
+	    p_len[i] = strlen(p_line[i]);
+	    p_char[i] = '-';
+	}
+	if (hunk_type == 'c') {
+	    ret = pgets(buf, sizeof buf, pfp);
+	    p_input_line++;
+	    if (ret == Nullch)
+		fatal2("Unexpected end of file in patch at line %ld.\n",
+		    p_input_line);
+	    if (*buf != '-')
+		fatal2("--- expected at line %ld of patch.\n", p_input_line);
+	}
+	Sprintf(buf, "--- %ld,%ld\n", min, max);
+	p_line[i] = savestr(buf);
+	if (out_of_mem) {
+	    p_end = i-1;
+	    return FALSE;
+	}
+	p_char[i] = '=';
+	for (i++; i<=p_end; i++) {
+	    ret = pgets(buf, sizeof buf, pfp);
+	    p_input_line++;
+	    if (ret == Nullch)
+		fatal2("Unexpected end of file in patch at line %ld.\n",
+		    p_input_line);
+	    if (*buf != '>')
+		fatal2("> expected at line %ld of patch.\n", p_input_line);
+	    p_line[i] = savestr(buf+2);
+	    if (out_of_mem) {
+		p_end = i-1;
+		return FALSE;
+	    }
+	    p_len[i] = strlen(p_line[i]);
+	    p_char[i] = '+';
+	}
+    }
+    if (reverse)			/* backwards patch? */
+	if (!pch_swap())
+	    say1("Not enough memory to swap next hunk!\n");
+#ifdef DEBUGGING
+    if (debug & 2) {
+	int i;
+	char special;
+
+	for (i=0; i <= p_end; i++) {
+	    if (i == p_ptrn_lines)
+		special = '^';
+	    else
+		special = ' ';
+	    fprintf(stderr, "%3d %c %c %s", i, p_char[i], special, p_line[i]);
+	    Fflush(stderr);
+	}
+    }
+#endif
+    if (p_end+1 < hunkmax)	/* paranoia reigns supreme... */
+	p_char[p_end+1] = '^';  /* add a stopper for apply_hunk */
+    return TRUE;
+
+malformed:
+    fatal3("Malformed patch at line %ld: %s", p_input_line, buf);
+		/* about as informative as "Syntax error" in C */
+    return FALSE;	/* for lint */
+}
+
+/* Input a line from the patch file, worrying about indentation. */
+
+char *
+pgets(bf,sz,fp)
+char *bf;
+int sz;
+FILE *fp;
+{
+    char *ret = fgets(bf, sz, fp);
+    Reg1 char *s;
+    Reg2 int indent = 0;
+
+    if (p_indent && ret != Nullch) {
+	for (s=buf; indent < p_indent && (*s == ' ' || *s == '\t'); s++) {
+	    if (*s == '\t')
+		indent += 8 - (indent % 7);
+	    else
+		indent++;
+	}
+	if (buf != s)
+	    Strcpy(buf, s);
+    }
+    return ret;
+}
+
+/* Reverse the old and new portions of the current hunk. */
+
+bool
+pch_swap()
+{
+    char **tp_line;		/* the text of the hunk */
+    short *tp_len;		/* length of each line */
+    char *tp_char;		/* +, -, and ! */
+    Reg1 LINENUM i;
+    Reg2 LINENUM n;
+    bool blankline = FALSE;
+    Reg3 char *s;
+
+    i = p_first;
+    p_first = p_newfirst;
+    p_newfirst = i;
+    
+    /* make a scratch copy */
+
+    tp_line = p_line;
+    tp_len = p_len;
+    tp_char = p_char;
+    p_line = Null(char**);	/* force set_hunkmax to allocate again */
+    p_len = Null(short*);
+    p_char = Nullch;
+    set_hunkmax();
+    if (p_line == Null(char**) || p_len == Null(short*) || p_char == Nullch) {
+#ifndef lint
+	if (p_line == Null(char**))
+	    free((char*)p_line);
+	p_line = tp_line;
+	if (p_len == Null(short*))
+	    free((char*)p_len);
+	p_len = tp_len;
+#endif
+	if (p_char == Nullch)
+	    free((char*)p_char);
+	p_char = tp_char;
+	return FALSE;		/* not enough memory to swap hunk! */
+    }
+
+    /* now turn the new into the old */
+
+    i = p_ptrn_lines + 1;
+    if (tp_char[i] == '\n') {		/* account for possible blank line */
+	blankline = TRUE;
+	i++;
+    }
+    if (p_efake >= 0) {			/* fix non-freeable ptr range */
+	n = p_end - i + 1;
+	if (p_efake > i)
+	    n = -n;
+	p_efake += n;
+	p_bfake += n;
+    }
+    for (n=0; i <= p_end; i++,n++) {
+	p_line[n] = tp_line[i];
+	p_char[n] = tp_char[i];
+	if (p_char[n] == '+')
+	    p_char[n] = '-';
+	p_len[n] = tp_len[i];
+    }
+    if (blankline) {
+	i = p_ptrn_lines + 1;
+	p_line[n] = tp_line[i];
+	p_char[n] = tp_char[i];
+	p_len[n] = tp_len[i];
+	n++;
+    }
+    assert(p_char[0] == '=');
+    p_char[0] = '*';
+    for (s=p_line[0]; *s; s++)
+	if (*s == '-')
+	    *s = '*';
+
+    /* now turn the old into the new */
+
+    assert(tp_char[0] == '*');
+    tp_char[0] = '=';
+    for (s=tp_line[0]; *s; s++)
+	if (*s == '*')
+	    *s = '-';
+    for (i=0; n <= p_end; i++,n++) {
+	p_line[n] = tp_line[i];
+	p_char[n] = tp_char[i];
+	if (p_char[n] == '-')
+	    p_char[n] = '+';
+	p_len[n] = tp_len[i];
+    }
+    assert(i == p_ptrn_lines + 1);
+    i = p_ptrn_lines;
+    p_ptrn_lines = p_repl_lines;
+    p_repl_lines = i;
+#ifndef lint
+    if (tp_line == Null(char**))
+	free((char*)tp_line);
+    if (tp_len == Null(short*))
+	free((char*)tp_len);
+#endif
+    if (tp_char == Nullch)
+	free((char*)tp_char);
+    return TRUE;
+}
+
+/* Return the specified line position in the old file of the old context. */
+
+LINENUM
+pch_first()
+{
+    return p_first;
+}
+
+/* Return the number of lines of old context. */
+
+LINENUM
+pch_ptrn_lines()
+{
+    return p_ptrn_lines;
+}
+
+/* Return the probable line position in the new file of the first line. */
+
+LINENUM
+pch_newfirst()
+{
+    return p_newfirst;
+}
+
+/* Return the number of lines in the replacement text including context. */
+
+LINENUM
+pch_repl_lines()
+{
+    return p_repl_lines;
+}
+
+/* Return the number of lines in the whole hunk. */
+
+LINENUM
+pch_end()
+{
+    return p_end;
+}
+
+/* Return the number of context lines before the first changed line. */
+
+LINENUM
+pch_context()
+{
+    return p_context;
+}
+
+/* Return the length of a particular patch line. */
+
+short
+pch_line_len(line)
+LINENUM line;
+{
+    return p_len[line];
+}
+
+/* Return the control character (+, -, *, !, etc) for a patch line. */
+
+char
+pch_char(line)
+LINENUM line;
+{
+    return p_char[line];
+}
+
+/* Return a pointer to a particular patch line. */
+
+char *
+pfetch(line)
+LINENUM line;
+{
+    return p_line[line];
+}
+
+/* Return where in the patch file this hunk began, for error messages. */
+
+LINENUM
+pch_hunk_beg()
+{
+    return p_hunk_beg;
+}
+
+/* Apply an ed script by feeding ed itself. */
+
+void
+do_ed_script()
+{
+    Reg1 char *t;
+    Reg2 long beginning_of_this_line;
+    Reg3 bool this_line_is_command = FALSE;
+    Reg4 FILE *pipefp;
+    FILE *popen();
+
+    if (!skip_rest_of_patch) {
+	Unlink(TMPOUTNAME);
+	copy_file(filearg[0], TMPOUTNAME);
+	if (verbose)
+	    Sprintf(buf, "/bin/ed %s", TMPOUTNAME);
+	else
+	    Sprintf(buf, "/bin/ed - %s", TMPOUTNAME);
+	pipefp = popen(buf, "w");
+    }
+    for (;;) {
+	beginning_of_this_line = ftell(pfp);
+	if (pgets(buf, sizeof buf, pfp) == Nullch) {
+	    next_intuit_at(beginning_of_this_line,p_input_line);
+	    break;
+	}
+	p_input_line++;
+	for (t=buf; isdigit(*t) || *t == ','; t++) ;
+	this_line_is_command = (isdigit(*buf) &&
+	  (*t == 'd' || *t == 'c' || *t == 'a') );
+	if (this_line_is_command) {
+	    if (!skip_rest_of_patch)
+		fputs(buf, pipefp);
+	    if (*t != 'd') {
+		while (pgets(buf, sizeof buf, pfp) != Nullch) {
+		    p_input_line++;
+		    if (!skip_rest_of_patch)
+			fputs(buf, pipefp);
+		    if (strEQ(buf, ".\n"))
+			break;
+		}
+	    }
+	}
+	else {
+	    next_intuit_at(beginning_of_this_line,p_input_line);
+	    break;
+	}
+    }
+    if (skip_rest_of_patch)
+	return;
+    fprintf(pipefp, "w\n");
+    fprintf(pipefp, "q\n");
+    Fflush(pipefp);
+    Pclose(pipefp);
+    ignore_signals();
+    if (move_file(TMPOUTNAME, outname) < 0) {
+	toutkeep = TRUE;
+	chmod(TMPOUTNAME, filemode);
+    }
+    else
+	chmod(outname, filemode);
+    set_signals();
+}
diff --git a/usr.bin/patch/pch.h b/usr.bin/patch/pch.h
new file mode 100644
index 0000000..97a5b28
--- /dev/null
+++ b/usr.bin/patch/pch.h
@@ -0,0 +1,36 @@
+/* $Header: pch.h,v 2.0.1.1 87/01/30 22:47:16 lwall Exp $
+ *
+ * $Log:	pch.h,v $
+ * Revision 2.0.1.1  87/01/30  22:47:16  lwall
+ * Added do_ed_script().
+ * 
+ * Revision 2.0  86/09/17  15:39:57  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+EXT FILE *pfp INIT(Nullfp);		/* patch file pointer */
+
+void re_patch();
+void open_patch_file();
+void set_hunkmax();
+void grow_hunkmax();
+bool there_is_another_patch();
+int intuit_diff_type();
+void next_intuit_at();
+void skip_to();
+bool another_hunk();
+bool pch_swap();
+char *pfetch();
+short pch_line_len();
+LINENUM pch_first();
+LINENUM pch_ptrn_lines();
+LINENUM pch_newfirst();
+LINENUM pch_repl_lines();
+LINENUM pch_end();
+LINENUM pch_context();
+LINENUM pch_hunk_beg();
+char pch_char();
+char *pfetch();
+char *pgets();
+void do_ed_script();
diff --git a/usr.bin/patch/util.c b/usr.bin/patch/util.c
new file mode 100644
index 0000000..5582d18
--- /dev/null
+++ b/usr.bin/patch/util.c
@@ -0,0 +1,339 @@
+#include "EXTERN.h"
+#include "common.h"
+#include "INTERN.h"
+#include "util.h"
+
+/* Rename a file, copying it if necessary. */
+
+int
+move_file(from,to)
+char *from, *to;
+{
+    char bakname[512];
+    Reg1 char *s;
+    Reg2 int i;
+    Reg3 int fromfd;
+
+    /* to stdout? */
+
+    if (strEQ(to, "-")) {
+#ifdef DEBUGGING
+	if (debug & 4)
+	    say2("Moving %s to stdout.\n", from);
+#endif
+	fromfd = open(from, 0);
+	if (fromfd < 0)
+	    fatal2("patch: internal error, can't reopen %s\n", from);
+	while ((i=read(fromfd, buf, sizeof buf)) > 0)
+	    if (write(1, buf, i) != 1)
+		fatal1("patch: write failed\n");
+	Close(fromfd);
+	return 0;
+    }
+
+    Strcpy(bakname, to);
+    Strcat(bakname, origext?origext:ORIGEXT);
+    if (stat(to, &filestat) >= 0) {	/* output file exists */
+	dev_t to_device = filestat.st_dev;
+	ino_t to_inode  = filestat.st_ino;
+	char *simplename = bakname;
+	
+	for (s=bakname; *s; s++) {
+	    if (*s == '/')
+		simplename = s+1;
+	}
+	/* find a backup name that is not the same file */
+	while (stat(bakname, &filestat) >= 0 &&
+		to_device == filestat.st_dev && to_inode == filestat.st_ino) {
+	    for (s=simplename; *s && !islower(*s); s++) ;
+	    if (*s)
+		*s = toupper(*s);
+	    else
+		Strcpy(simplename, simplename+1);
+	}
+	while (unlink(bakname) >= 0) ;	/* while() is for benefit of Eunice */
+#ifdef DEBUGGING
+	if (debug & 4)
+	    say3("Moving %s to %s.\n", to, bakname);
+#endif
+	if (link(to, bakname) < 0) {
+	    say3("patch: can't backup %s, output is in %s\n",
+		to, from);
+	    return -1;
+	}
+	while (unlink(to) >= 0) ;
+    }
+#ifdef DEBUGGING
+    if (debug & 4)
+	say3("Moving %s to %s.\n", from, to);
+#endif
+    if (link(from, to) < 0) {		/* different file system? */
+	Reg4 int tofd;
+	
+	tofd = creat(to, 0666);
+	if (tofd < 0) {
+	    say3("patch: can't create %s, output is in %s.\n",
+	      to, from);
+	    return -1;
+	}
+	fromfd = open(from, 0);
+	if (fromfd < 0)
+	    fatal2("patch: internal error, can't reopen %s\n", from);
+	while ((i=read(fromfd, buf, sizeof buf)) > 0)
+	    if (write(tofd, buf, i) != i)
+		fatal1("patch: write failed\n");
+	Close(fromfd);
+	Close(tofd);
+    }
+    Unlink(from);
+    return 0;
+}
+
+/* Copy a file. */
+
+void
+copy_file(from,to)
+char *from, *to;
+{
+    Reg3 int tofd;
+    Reg2 int fromfd;
+    Reg1 int i;
+    
+    tofd = creat(to, 0666);
+    if (tofd < 0)
+	fatal2("patch: can't create %s.\n", to);
+    fromfd = open(from, 0);
+    if (fromfd < 0)
+	fatal2("patch: internal error, can't reopen %s\n", from);
+    while ((i=read(fromfd, buf, sizeof buf)) > 0)
+	if (write(tofd, buf, i) != i)
+	    fatal2("patch: write (%s) failed\n", to);
+    Close(fromfd);
+    Close(tofd);
+}
+
+/* Allocate a unique area for a string. */
+
+char *
+savestr(s)
+Reg1 char *s;
+{
+    Reg3 char *rv;
+    Reg2 char *t;
+
+    if (!s)
+	s = "Oops";
+    t = s;
+    while (*t++);
+    rv = malloc((MEM) (t - s));
+    if (rv == Nullch) {
+	if (using_plan_a)
+	    out_of_mem = TRUE;
+	else
+	    fatal1("patch: out of memory (savestr)\n");
+    }
+    else {
+	t = rv;
+	while (*t++ = *s++);
+    }
+    return rv;
+}
+
+#if defined(lint) && defined(CANVARARG)
+
+/*VARARGS ARGSUSED*/
+say(pat) char *pat; { ; }
+/*VARARGS ARGSUSED*/
+fatal(pat) char *pat; { ; }
+/*VARARGS ARGSUSED*/
+ask(pat) char *pat; { ; }
+
+#else
+
+/* Vanilla terminal output (buffered). */
+
+void
+say(pat,arg1,arg2,arg3)
+char *pat;
+int arg1,arg2,arg3;
+{
+    fprintf(stderr, pat, arg1, arg2, arg3);
+    Fflush(stderr);
+}
+
+/* Terminal output, pun intended. */
+
+void				/* very void */
+fatal(pat,arg1,arg2,arg3)
+char *pat;
+int arg1,arg2,arg3;
+{
+    void my_exit();
+
+    say(pat, arg1, arg2, arg3);
+    my_exit(1);
+}
+
+/* Get a response from the user, somehow or other. */
+
+void
+ask(pat,arg1,arg2,arg3)
+char *pat;
+int arg1,arg2,arg3;
+{
+    int ttyfd;
+    int r;
+    bool tty2 = isatty(2);
+
+    Sprintf(buf, pat, arg1, arg2, arg3);
+    Fflush(stderr);
+    write(2, buf, strlen(buf));
+    if (tty2) {				/* might be redirected to a file */
+	r = read(2, buf, sizeof buf);
+    }
+    else if (isatty(1)) {		/* this may be new file output */
+	Fflush(stdout);
+	write(1, buf, strlen(buf));
+	r = read(1, buf, sizeof buf);
+    }
+    else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) {
+					/* might be deleted or unwriteable */
+	write(ttyfd, buf, strlen(buf));
+	r = read(ttyfd, buf, sizeof buf);
+	Close(ttyfd);
+    }
+    else if (isatty(0)) {		/* this is probably patch input */
+	Fflush(stdin);
+	write(0, buf, strlen(buf));
+	r = read(0, buf, sizeof buf);
+    }
+    else {				/* no terminal at all--default it */
+	buf[0] = '\n';
+	r = 1;
+    }
+    if (r <= 0)
+	buf[0] = 0;
+    else
+	buf[r] = '\0';
+    if (!tty2)
+	say1(buf);
+}
+#endif lint
+
+/* How to handle certain events when not in a critical region. */
+
+void
+set_signals()
+{
+    void my_exit();
+
+#ifndef lint
+    if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
+	Signal(SIGHUP, my_exit);
+    if (signal(SIGINT, SIG_IGN) != SIG_IGN)
+	Signal(SIGINT, my_exit);
+#endif
+}
+
+/* How to handle certain events when in a critical region. */
+
+void
+ignore_signals()
+{
+#ifndef lint
+    Signal(SIGHUP, SIG_IGN);
+    Signal(SIGINT, SIG_IGN);
+#endif
+}
+
+/* Make sure we'll have the directories to create a file. */
+
+void
+makedirs(filename,striplast)
+Reg1 char *filename;
+bool striplast;
+{
+    char tmpbuf[256];
+    Reg2 char *s = tmpbuf;
+    char *dirv[20];
+    Reg3 int i;
+    Reg4 int dirvp = 0;
+
+    while (*filename) {
+	if (*filename == '/') {
+	    filename++;
+	    dirv[dirvp++] = s;
+	    *s++ = '\0';
+	}
+	else {
+	    *s++ = *filename++;
+	}
+    }
+    *s = '\0';
+    dirv[dirvp] = s;
+    if (striplast)
+	dirvp--;
+    if (dirvp < 0)
+	return;
+    strcpy(buf, "mkdir");
+    s = buf;
+    for (i=0; i<=dirvp; i++) {
+	while (*s) s++;
+	*s++ = ' ';
+	strcpy(s, tmpbuf);
+	*dirv[i] = '/';
+    }
+    system(buf);
+}
+
+/* Make filenames more reasonable. */
+
+char *
+fetchname(at,strip_leading,assume_exists)
+char *at;
+int strip_leading;
+int assume_exists;
+{
+    char *s;
+    char *name;
+    Reg1 char *t;
+    char tmpbuf[200];
+
+    if (!at)
+	return Nullch;
+    s = savestr(at);
+    for (t=s; isspace(*t); t++) ;
+    name = t;
+#ifdef DEBUGGING
+    if (debug & 128)
+	say4("fetchname %s %d %d\n",name,strip_leading,assume_exists);
+#endif
+    if (strnEQ(name, "/dev/null", 9))	/* so files can be created by diffing */
+	return Nullch;			/*   against /dev/null. */
+    for (; *t && !isspace(*t); t++)
+	if (*t == '/')
+	    if (--strip_leading >= 0)
+		name = t+1;
+    *t = '\0';
+    if (name != s && *s != '/') {
+	name[-1] = '\0';
+	if (stat(s, &filestat) && filestat.st_mode & S_IFDIR) {
+	    name[-1] = '/';
+	    name=s;
+	}
+    }
+    name = savestr(name);
+    Sprintf(tmpbuf, "RCS/%s", name);
+    free(s);
+    if (stat(name, &filestat) < 0 && !assume_exists) {
+	Strcat(tmpbuf, RCSSUFFIX);
+	if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+4, &filestat) < 0) {
+	    Sprintf(tmpbuf, "SCCS/%s%s", SCCSPREFIX, name);
+	    if (stat(tmpbuf, &filestat) < 0 && stat(tmpbuf+5, &filestat) < 0) {
+		free(name);
+		name = Nullch;
+	    }
+	}
+    }
+    return name;
+}
diff --git a/usr.bin/patch/util.h b/usr.bin/patch/util.h
new file mode 100644
index 0000000..9896c63
--- /dev/null
+++ b/usr.bin/patch/util.h
@@ -0,0 +1,74 @@
+/* $Header: util.h,v 2.0 86/09/17 15:40:06 lwall Exp $
+ *
+ * $Log:	util.h,v $
+ * Revision 2.0  86/09/17  15:40:06  lwall
+ * Baseline for netwide release.
+ * 
+ */
+
+/* and for those machine that can't handle a variable argument list */
+
+#ifdef CANVARARG
+
+#define say1 say
+#define say2 say
+#define say3 say
+#define say4 say
+#define ask1 ask
+#define ask2 ask
+#define ask3 ask
+#define ask4 ask
+#define fatal1 fatal
+#define fatal2 fatal
+#define fatal3 fatal
+#define fatal4 fatal
+
+#else /* hope they allow multi-line macro actual arguments */
+
+#ifdef lint
+
+#define say1(a) say(a, 0, 0, 0)
+#define say2(a,b) say(a, (b)==(b), 0, 0)
+#define say3(a,b,c) say(a, (b)==(b), (c)==(c), 0)
+#define say4(a,b,c,d) say(a, (b)==(b), (c)==(c), (d)==(d))
+#define ask1(a) ask(a, 0, 0, 0)
+#define ask2(a,b) ask(a, (b)==(b), 0, 0)
+#define ask3(a,b,c) ask(a, (b)==(b), (c)==(c), 0)
+#define ask4(a,b,c,d) ask(a, (b)==(b), (c)==(c), (d)==(d))
+#define fatal1(a) fatal(a, 0, 0, 0)
+#define fatal2(a,b) fatal(a, (b)==(b), 0, 0)
+#define fatal3(a,b,c) fatal(a, (b)==(b), (c)==(c), 0)
+#define fatal4(a,b,c,d) fatal(a, (b)==(b), (c)==(c), (d)==(d))
+
+#else /* lint */
+    /* if this doesn't work, try defining CANVARARG above */
+#define say1(a) say(a, Nullch, Nullch, Nullch)
+#define say2(a,b) say(a, b, Nullch, Nullch)
+#define say3(a,b,c) say(a, b, c, Nullch)
+#define say4 say
+#define ask1(a) ask(a, Nullch, Nullch, Nullch)
+#define ask2(a,b) ask(a, b, Nullch, Nullch)
+#define ask3(a,b,c) ask(a, b, c, Nullch)
+#define ask4 ask
+#define fatal1(a) fatal(a, Nullch, Nullch, Nullch)
+#define fatal2(a,b) fatal(a, b, Nullch, Nullch)
+#define fatal3(a,b,c) fatal(a, b, c, Nullch)
+#define fatal4 fatal
+
+#endif /* lint */
+
+/* if neither of the above work, join all multi-line macro calls. */
+#endif
+
+EXT char serrbuf[BUFSIZ];		/* buffer for stderr */
+
+char *fetchname();
+int move_file();
+void copy_file();
+void say();
+void fatal();
+void ask();
+char *savestr();
+void set_signals();
+void ignore_signals();
+void makedirs();