add tools

1 files changed, 1064 insertions, 0 deletions

diff --git a/usr.bin/patch/patch.c b/usr.bin/patch/patch.c
new file mode 100644
index 0000000..088ea1f
--- /dev/null
+++ b/usr.bin/patch/patch.c
@@ -0,0 +1,1064 @@
+/*	$OpenBSD: patch.c,v 1.69 2019/12/02 22:17:32 jca Exp $	*/
+
+/*
+ * patch - a program to apply diffs to original files
+ * 
+ * Copyright 1986, Larry Wall
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following condition is met:
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this condition and the following disclaimer.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ * 
+ * -C option added in 1998, original code by Marc Espie, based on FreeBSD
+ * behaviour
+ */
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <ctype.h>
+#include <getopt.h>
+#include <limits.h>
+#include <paths.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#include "common.h"
+#include "util.h"
+#include "pch.h"
+#include "inp.h"
+#include "backupfile.h"
+#include "ed.h"
+
+mode_t		filemode = 0644;
+
+char		*buf;			/* general purpose buffer */
+size_t		 bufsz;			/* general purpose buffer size */
+
+bool		using_plan_a = true;	/* try to keep everything in memory */
+bool		out_of_mem = false;	/* ran out of memory in plan a */
+
+#define MAXFILEC 2
+
+char		*filearg[MAXFILEC];
+bool		ok_to_create_file = false;
+char		*outname = NULL;
+char		*origprae = NULL;
+char		*TMPOUTNAME;
+char		*TMPINNAME;
+char		*TMPREJNAME;
+char		*TMPPATNAME;
+bool		toutkeep = false;
+bool		trejkeep = false;
+bool		warn_on_invalid_line;
+bool		last_line_missing_eol;
+
+#ifdef DEBUGGING
+int		debug = 0;
+#endif
+
+bool		force = false;
+bool		batch = false;
+bool		verbose = true;
+bool		reverse = false;
+bool		noreverse = false;
+bool		skip_rest_of_patch = false;
+int		strippath = 957;
+bool		canonicalize = false;
+bool		check_only = false;
+int		diff_type = 0;
+char		*revision = NULL;	/* prerequisite revision, if any */
+LINENUM		input_lines = 0;	/* how long is input file in lines */
+int		posix = 0;		/* strict POSIX mode? */
+
+static void	reinitialize_almost_everything(void);
+static void	get_some_switches(void);
+static LINENUM	locate_hunk(LINENUM);
+static void	abort_context_hunk(void);
+static void	rej_line(int, LINENUM);
+static void	abort_hunk(void);
+static void	apply_hunk(LINENUM);
+static void	init_output(const char *);
+static void	init_reject(const char *);
+static void	copy_till(LINENUM, bool);
+static void	spew_output(void);
+static void	dump_line(LINENUM, bool);
+static bool	patch_match(LINENUM, LINENUM, LINENUM);
+static bool	similar(const char *, const char *, int);
+static __dead void usage(void);
+
+/* true if -E was specified on command line.  */
+static bool	remove_empty_files = false;
+
+/* true if -R was specified on command line.  */
+static bool	reverse_flag_specified = false;
+
+/* buffer holding the name of the rejected patch file. */
+static char	rejname[PATH_MAX];
+
+/* how many input lines have been irretractibly output */
+static LINENUM	last_frozen_line = 0;
+
+static int	Argc;		/* guess */
+static char	**Argv;
+static int	Argc_last;	/* for restarting plan_b */
+static char	**Argv_last;
+
+static FILE	*ofp = NULL;	/* output file pointer */
+static FILE	*rejfp = NULL;	/* reject file pointer */
+
+static int	filec = 0;	/* how many file arguments? */
+static LINENUM	last_offset = 0;
+static LINENUM	maxfuzz = 2;
+
+/* patch using ifdef, ifndef, etc. */
+static bool		do_defines = false;
+/* #ifdef xyzzy */
+static char		if_defined[128];
+/* #ifndef xyzzy */
+static char		not_defined[128];
+/* #else */
+static const char	else_defined[] = "#else\n";
+/* #endif xyzzy */
+static char		end_defined[128];
+
+
+/* Apply a set of diffs as appropriate. */
+
+int
+main(int argc, char *argv[])
+{
+	int	error = 0, hunk, failed, i, fd;
+	bool	patch_seen;
+	LINENUM	where = 0, newwhere, fuzz, mymaxfuzz;
+	const	char *tmpdir;
+	char	*v;
+
+	if (pledge("stdio rpath wpath cpath tmppath fattr", NULL) == -1) {
+		perror("pledge");
+		my_exit(2);
+	}
+
+	bufsz = INITLINELEN;
+	if ((buf = malloc(bufsz)) == NULL)
+		pfatal("allocating input buffer");
+	buf[0] = '\0';
+
+	setvbuf(stdout, NULL, _IOLBF, 0);
+	setvbuf(stderr, NULL, _IOLBF, 0);
+	for (i = 0; i < MAXFILEC; i++)
+		filearg[i] = NULL;
+
+	/* Cons up the names of the temporary files.  */
+	if ((tmpdir = getenv("TMPDIR")) == NULL || *tmpdir == '\0')
+		tmpdir = _PATH_TMP;
+	for (i = strlen(tmpdir) - 1; i > 0 && tmpdir[i] == '/'; i--)
+		;
+	i++;
+	if (asprintf(&TMPOUTNAME, "%.*s/patchoXXXXXXXXXX", i, tmpdir) == -1)
+		fatal("cannot allocate memory");
+	if ((fd = mkstemp(TMPOUTNAME)) == -1)
+		pfatal("can't create %s", TMPOUTNAME);
+	close(fd);
+
+	if (asprintf(&TMPINNAME, "%.*s/patchiXXXXXXXXXX", i, tmpdir) == -1)
+		fatal("cannot allocate memory");
+	if ((fd = mkstemp(TMPINNAME)) == -1)
+		pfatal("can't create %s", TMPINNAME);
+	close(fd);
+
+	if (asprintf(&TMPREJNAME, "%.*s/patchrXXXXXXXXXX", i, tmpdir) == -1)
+		fatal("cannot allocate memory");
+	if ((fd = mkstemp(TMPREJNAME)) == -1)
+		pfatal("can't create %s", TMPREJNAME);
+	close(fd);
+
+	if (asprintf(&TMPPATNAME, "%.*s/patchpXXXXXXXXXX", i, tmpdir) == -1)
+		fatal("cannot allocate memory");
+	if ((fd = mkstemp(TMPPATNAME)) == -1)
+		pfatal("can't create %s", TMPPATNAME);
+	close(fd);
+
+	v = getenv("SIMPLE_BACKUP_SUFFIX");
+	if (v)
+		simple_backup_suffix = v;
+	else
+		simple_backup_suffix = ORIGEXT;
+
+	/* parse switches */
+	Argc = argc;
+	Argv = argv;
+	get_some_switches();
+
+	if (backup_type == none) {
+		if ((v = getenv("PATCH_VERSION_CONTROL")) == NULL)
+			v = getenv("VERSION_CONTROL");
+		if (v != NULL || !posix)
+			backup_type = get_version(v);	/* OK to pass NULL. */
+	}
+
+	/* make sure we clean up /tmp in case of disaster */
+	set_signals(0);
+
+	patch_seen = false;
+	for (open_patch_file(filearg[1]); there_is_another_patch();
+	    reinitialize_almost_everything()) {
+		/* for each patch in patch file */
+
+		patch_seen = true;
+
+		warn_on_invalid_line = true;
+
+		if (outname == NULL)
+			outname = xstrdup(filearg[0]);
+
+		/* initialize the patched file */
+		if (!skip_rest_of_patch)
+			init_output(TMPOUTNAME);
+
+		/* initialize reject file */
+		init_reject(TMPREJNAME);
+
+		/* find out where all the lines are */
+		if (!skip_rest_of_patch)
+			scan_input(filearg[0]);
+
+		/* for ed script just up and do it and exit */
+		if (diff_type == ED_DIFF) {
+			do_ed_script();
+			continue;
+		}
+
+		/* 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 = 0;
+			mymaxfuzz = pch_context();
+			if (maxfuzz < mymaxfuzz)
+				mymaxfuzz = maxfuzz;
+			if (!skip_rest_of_patch) {
+				do {
+					where = locate_hunk(fuzz);
+					if (hunk == 1 && where == 0 && !force) {
+						/* dwim for reversed patch? */
+						if (!pch_swap()) {
+							if (fuzz == 0)
+								say("Not enough memory to try swapped hunk!  Assuming unswapped.\n");
+							continue;
+						}
+						reverse = !reverse;
+						/* try again */
+						where = locate_hunk(fuzz);
+						if (where == 0) {
+							/* didn't find it swapped */
+							if (!pch_swap())
+								/* put it back to normal */
+								fatal("lost hunk on alloc error!\n");
+							reverse = !reverse;
+						} else if (noreverse) {
+							if (!pch_swap())
+								/* put it back to normal */
+								fatal("lost hunk on alloc error!\n");
+							reverse = !reverse;
+							say("Ignoring previously applied (or reversed) patch.\n");
+							skip_rest_of_patch = true;
+						} else if (batch) {
+							if (verbose)
+								say("%seversed (or previously applied) patch detected!  %s -R.",
+								    reverse ? "R" : "Unr",
+								    reverse ? "Assuming" : "Ignoring");
+						} else {
+							ask("%seversed (or previously applied) patch detected!  %s -R? [y] ",
+							    reverse ? "R" : "Unr",
+							    reverse ? "Assume" : "Ignore");
+							if (*buf == 'n') {
+								ask("Apply anyway? [n] ");
+								if (*buf != 'y')
+									skip_rest_of_patch = true;
+								where = 0;
+								reverse = !reverse;
+								if (!pch_swap())
+									/* put it back to normal */
+									fatal("lost hunk on alloc error!\n");
+							}
+						}
+					}
+				} while (!skip_rest_of_patch && where == 0 &&
+				    ++fuzz <= mymaxfuzz);
+
+				if (skip_rest_of_patch) {	/* just got decided */
+					fclose(ofp);
+					ofp = NULL;
+				}
+			}
+			newwhere = pch_newfirst() + last_offset;
+			if (skip_rest_of_patch) {
+				abort_hunk();
+				failed++;
+				if (verbose)
+					say("Hunk #%d ignored at %ld.\n",
+					    hunk, newwhere);
+			} else if (where == 0) {
+				abort_hunk();
+				failed++;
+				if (verbose)
+					say("Hunk #%d failed at %ld.\n",
+					    hunk, newwhere);
+			} else {
+				apply_hunk(where);
+				if (verbose) {
+					say("Hunk #%d succeeded at %ld",
+					    hunk, newwhere);
+					if (fuzz != 0)
+						say(" with fuzz %ld", fuzz);
+					if (last_offset)
+						say(" (offset %ld line%s)",
+						    last_offset,
+						    last_offset == 1L ? "" : "s");
+					say(".\n");
+				}
+			}
+		}
+
+		if (out_of_mem && using_plan_a) {
+			Argc = Argc_last;
+			Argv = Argv_last;
+			say("\n\nRan out of memory using Plan A--trying again...\n\n");
+			if (ofp)
+				fclose(ofp);
+			ofp = NULL;
+			if (rejfp)
+				fclose(rejfp);
+			rejfp = NULL;
+			continue;
+		}
+		if (hunk == 0)
+			fatal("Internal error: hunk should not be 0\n");
+
+		/* 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) {
+			struct stat	statbuf;
+			char	*realout = outname;
+
+			if (!check_only) {
+				if (move_file(TMPOUTNAME, outname) < 0) {
+					toutkeep = true;
+					realout = TMPOUTNAME;
+					chmod(TMPOUTNAME, filemode);
+				} else
+					chmod(outname, filemode);
+
+				if (remove_empty_files &&
+				    stat(realout, &statbuf) == 0 &&
+				    statbuf.st_size == 0) {
+					if (verbose)
+						say("Removing %s (empty after patching).\n",
+						    realout);
+					unlink(realout);
+				}
+			}
+		}
+		fclose(rejfp);
+		rejfp = NULL;
+		if (failed) {
+			error = 1;
+			if (*rejname == '\0') {
+				if (strlcpy(rejname, outname,
+				    sizeof(rejname)) >= sizeof(rejname))
+					fatal("filename %s is too long\n", outname);
+				if (strlcat(rejname, REJEXT,
+				    sizeof(rejname)) >= sizeof(rejname))
+					fatal("filename %s is too long\n", outname);
+			}
+			if (!check_only)
+				say("%d out of %d hunks %s--saving rejects to %s\n",
+				    failed, hunk, skip_rest_of_patch ? "ignored" : "failed", rejname);
+			else
+				say("%d out of %d hunks %s\n",
+				    failed, hunk, skip_rest_of_patch ? "ignored" : "failed");
+			if (!check_only && move_file(TMPREJNAME, rejname) < 0)
+				trejkeep = true;
+		}
+		set_signals(1);
+	}
+
+	if (!patch_seen)
+		error = 2;
+
+	my_exit(error);
+	/* NOTREACHED */
+}
+
+/* Prepare to find the next patch to do in the patch file. */
+
+static void
+reinitialize_almost_everything(void)
+{
+	re_patch();
+	re_input();
+
+	input_lines = 0;
+	last_frozen_line = 0;
+
+	filec = 0;
+	if (!out_of_mem) {
+		free(filearg[0]);
+		filearg[0] = NULL;
+	}
+
+	free(outname);
+	outname = NULL;
+
+	last_offset = 0;
+	diff_type = 0;
+
+	free(revision);
+	revision = NULL;
+
+	reverse = reverse_flag_specified;
+	skip_rest_of_patch = false;
+
+	get_some_switches();
+}
+
+/* Process switches and filenames. */
+
+static void
+get_some_switches(void)
+{
+	const char *options = "b::B:cCd:D:eEfF:i:lnNo:p:r:RstuvV:x:z:";
+	static struct option longopts[] = {
+		{"backup",		no_argument,		0,	'b'},
+		{"batch",		no_argument,		0,	't'},
+		{"check",		no_argument,		0,	'C'},
+		{"context",		no_argument,		0,	'c'},
+		{"debug",		required_argument,	0,	'x'},
+		{"directory",		required_argument,	0,	'd'},
+		{"dry-run",		no_argument,		0,	'C'},
+		{"ed",			no_argument,		0,	'e'},
+		{"force",		no_argument,		0,	'f'},
+		{"forward",		no_argument,		0,	'N'},
+		{"fuzz",		required_argument,	0,	'F'},
+		{"ifdef",		required_argument,	0,	'D'},
+		{"input",		required_argument,	0,	'i'},
+		{"ignore-whitespace",	no_argument,		0,	'l'},
+		{"normal",		no_argument,		0,	'n'},
+		{"output",		required_argument,	0,	'o'},
+		{"prefix",		required_argument,	0,	'B'},
+		{"quiet",		no_argument,		0,	's'},
+		{"reject-file",		required_argument,	0,	'r'},
+		{"remove-empty-files",	no_argument,		0,	'E'},
+		{"reverse",		no_argument,		0,	'R'},
+		{"silent",		no_argument,		0,	's'},
+		{"strip",		required_argument,	0,	'p'},
+		{"suffix",		required_argument,	0,	'z'},
+		{"unified",		no_argument,		0,	'u'},
+		{"version",		no_argument,		0,	'v'},
+		{"version-control",	required_argument,	0,	'V'},
+		{"posix",		no_argument,		&posix,	1},
+		{NULL,			0,			0,	0}
+	};
+	int ch;
+
+	rejname[0] = '\0';
+	Argc_last = Argc;
+	Argv_last = Argv;
+	if (!Argc)
+		return;
+	optreset = optind = 1;
+	while ((ch = getopt_long(Argc, Argv, options, longopts, NULL)) != -1) {
+		switch (ch) {
+		case 'b':
+			if (backup_type == none)
+				backup_type = numbered_existing;
+			if (optarg == NULL)
+				break;
+			if (verbose)
+				say("Warning, the ``-b suffix'' option has been"
+				    " obsoleted by the -z option.\n");
+			/* FALLTHROUGH */
+		case 'z':
+			/* must directly follow 'b' case for backwards compat */
+			simple_backup_suffix = xstrdup(optarg);
+			break;
+		case 'B':
+			origprae = xstrdup(optarg);
+			break;
+		case 'c':
+			diff_type = CONTEXT_DIFF;
+			break;
+		case 'C':
+			check_only = true;
+			break;
+		case 'd':
+			if (chdir(optarg) == -1)
+				pfatal("can't cd to %s", optarg);
+			break;
+		case 'D':
+			do_defines = true;
+			if (!isalpha((unsigned char)*optarg) && *optarg != '_')
+				fatal("argument to -D is not an identifier\n");
+			snprintf(if_defined, sizeof if_defined,
+			    "#ifdef %s\n", optarg);
+			snprintf(not_defined, sizeof not_defined,
+			    "#ifndef %s\n", optarg);
+			snprintf(end_defined, sizeof end_defined,
+			    "#endif /* %s */\n", optarg);
+			break;
+		case 'e':
+			diff_type = ED_DIFF;
+			break;
+		case 'E':
+			remove_empty_files = true;
+			break;
+		case 'f':
+			force = true;
+			break;
+		case 'F':
+			maxfuzz = atoi(optarg);
+			break;
+		case 'i':
+			if (++filec == MAXFILEC)
+				fatal("too many file arguments\n");
+			filearg[filec] = xstrdup(optarg);
+			break;
+		case 'l':
+			canonicalize = true;
+			break;
+		case 'n':
+			diff_type = NORMAL_DIFF;
+			break;
+		case 'N':
+			noreverse = true;
+			break;
+		case 'o':
+			outname = xstrdup(optarg);
+			break;
+		case 'p':
+			strippath = atoi(optarg);
+			break;
+		case 'r':
+			if (strlcpy(rejname, optarg,
+			    sizeof(rejname)) >= sizeof(rejname))
+				fatal("argument for -r is too long\n");
+			break;
+		case 'R':
+			reverse = true;
+			reverse_flag_specified = true;
+			break;
+		case 's':
+			verbose = false;
+			break;
+		case 't':
+			batch = true;
+			break;
+		case 'u':
+			diff_type = UNI_DIFF;
+			break;
+		case 'v':
+			version();
+			break;
+		case 'V':
+			backup_type = get_version(optarg);
+			break;
+#ifdef DEBUGGING
+		case 'x':
+			debug = atoi(optarg);
+			break;
+#endif
+		default:
+			if (ch != '\0')
+				usage();
+			break;
+		}
+	}
+	Argc -= optind;
+	Argv += optind;
+
+	if (Argc > 0) {
+		filearg[0] = xstrdup(*Argv++);
+		Argc--;
+		while (Argc > 0) {
+			if (++filec == MAXFILEC)
+				fatal("too many file arguments\n");
+			filearg[filec] = xstrdup(*Argv++);
+			Argc--;
+		}
+	}
+
+	if (getenv("POSIXLY_CORRECT") != NULL)
+		posix = 1;
+}
+
+static __dead void
+usage(void)
+{
+	fprintf(stderr,
+"usage: patch [-bCcEeflNnRstuv] [-B backup-prefix] [-D symbol] [-d directory]\n"
+"             [-F max-fuzz] [-i patchfile] [-o out-file] [-p strip-count]\n"
+"             [-r rej-name] [-V t | nil | never] [-x number] [-z backup-ext]\n"
+"             [--posix] [origfile [patchfile]]\n"
+"       patch <patchfile\n");
+	my_exit(2);
+}
+
+/*
+ * Attempt to find the right place to apply this hunk of patch.
+ */
+static LINENUM
+locate_hunk(LINENUM fuzz)
+{
+	LINENUM	first_guess = pch_first() + last_offset;
+	LINENUM	offset;
+	LINENUM	pat_lines = pch_ptrn_lines();
+	LINENUM	max_pos_offset = input_lines - first_guess - pat_lines + 1;
+	LINENUM	max_neg_offset = first_guess - last_frozen_line - 1 + pch_context();
+
+	if (pat_lines == 0) {		/* null range matches always */
+		if (verbose && fuzz == 0 && (diff_type == CONTEXT_DIFF
+		    || diff_type == NEW_CONTEXT_DIFF
+		    || diff_type == UNI_DIFF)) {
+			say("Empty context always matches.\n");
+		}
+		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, 0, fuzz))
+		return first_guess;
+	for (offset = 1; ; offset++) {
+		bool	check_after = (offset <= max_pos_offset);
+		bool	check_before = (offset <= max_neg_offset);
+
+		if (check_after && patch_match(first_guess, offset, fuzz)) {
+#ifdef DEBUGGING
+			if (debug & 1)
+				say("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)
+				say("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 0;
+	}
+}
+
+/* We did not find the pattern, dump out the hunk so they can handle it. */
+
+static void
+abort_context_hunk(void)
+{
+	LINENUM	i;
+	const LINENUM	pat_end = pch_end();
+	/*
+	 * add in last_offset to guess the same as the previous successful
+	 * hunk
+	 */
+	const LINENUM	oldfirst = pch_first() + last_offset;
+	const LINENUM	newfirst = pch_newfirst() + last_offset;
+	const LINENUM	oldlast = oldfirst + pch_ptrn_lines() - 1;
+	const LINENUM	newlast = newfirst + pch_repl_lines() - 1;
+	const char	*stars = (diff_type >= NEW_CONTEXT_DIFF ? " ****" : "");
+	const 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:
+			fatal("fatal internal error in abort_context_hunk\n");
+		}
+	}
+}
+
+static void
+rej_line(int ch, LINENUM i)
+{
+	size_t len;
+	const char *line = pfetch(i);
+
+	len = strlen(line);
+
+	fprintf(rejfp, "%c%s", ch, line);
+	if (len == 0 || line[len-1] != '\n')
+		fprintf(rejfp, "\n\\ No newline at end of file\n");
+}
+
+static void
+abort_hunk(void)
+{
+	LINENUM		i, j, split;
+	int		ch1, ch2;
+	const LINENUM	pat_end = pch_end();
+	const LINENUM	oldfirst = pch_first() + last_offset;
+	const LINENUM	newfirst = pch_newfirst() + last_offset;
+
+	if (diff_type != UNI_DIFF) {
+		abort_context_hunk();
+		return;
+	}
+	split = -1;
+	for (i = 0; i <= pat_end; i++) {
+		if (pch_char(i) == '=') {
+			split = i;
+			break;
+		}
+	}
+	if (split == -1) {
+		fprintf(rejfp, "malformed hunk: no split found\n");
+		return;
+	}
+	i = 0;
+	j = split + 1;
+	fprintf(rejfp, "@@ -%ld,%ld +%ld,%ld @@\n",
+	    pch_ptrn_lines() ? oldfirst : 0,
+	    pch_ptrn_lines(), newfirst, pch_repl_lines());
+	while (i < split || j <= pat_end) {
+		ch1 = i < split ? pch_char(i) : -1;
+		ch2 = j <= pat_end ? pch_char(j) : -1;
+		if (ch1 == '-') {
+			rej_line('-', i);
+			i++;
+		} else if (ch1 == ' ' && ch2 == ' ') {
+			rej_line(' ', i);
+			i++;
+			j++;
+		} else if (ch1 == '!' && ch2 == '!') {
+			while (i < split && ch1 == '!') {
+				rej_line('-', i);
+				i++;
+				ch1 = i < split ? pch_char(i) : -1;
+			}
+			while (j <= pat_end && ch2 == '!') {
+				rej_line('+', j);
+				j++;
+				ch2 = j <= pat_end ? pch_char(j) : -1;
+			}
+		} else if (ch1 == '*') {
+			i++;
+		} else if (ch2 == '+' || ch2 == ' ') {
+			rej_line(ch2, j);
+			j++;
+		} else {
+			fprintf(rejfp, "internal error on (%ld %ld %ld)\n",
+			    i, split, j);
+			rej_line(ch1, i);
+			rej_line(ch2, j);
+			return;
+		}
+	}
+}
+
+/* We found where to apply it (we hope), so do it. */
+
+static void
+apply_hunk(LINENUM where)
+{
+	LINENUM		old = 1;
+	const LINENUM	lastline = pch_ptrn_lines();
+	LINENUM		new = lastline + 1;
+#define OUTSIDE 0
+#define IN_IFNDEF 1
+#define IN_IFDEF 2
+#define IN_ELSE 3
+	int		def_state = OUTSIDE;
+	const 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, false);
+			if (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, false);
+			if (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)) {
+			say("Out-of-sync patch, lines %ld,%ld--mangled text or line numbers, maybe?\n",
+			    pch_hunk_beg() + old,
+			    pch_hunk_beg() + new);
+#ifdef DEBUGGING
+			say("oldchar = '%c', newchar = '%c'\n",
+			    pch_char(old), pch_char(new));
+#endif
+			my_exit(2);
+		} else if (pch_char(new) == '!') {
+			copy_till(where + old - 1, false);
+			if (do_defines) {
+				fputs(not_defined, ofp);
+				def_state = IN_IFNDEF;
+			}
+			while (pch_char(old) == '!') {
+				if (do_defines) {
+					fputs(pfetch(old), ofp);
+				}
+				last_frozen_line++;
+				old++;
+			}
+			if (do_defines) {
+				fputs(else_defined, ofp);
+				def_state = IN_ELSE;
+			}
+			while (pch_char(new) == '!') {
+				fputs(pfetch(new), ofp);
+				new++;
+			}
+		} else {
+			if (pch_char(new) != ' ')
+				fatal("Internal error: expected ' '\n");
+			old++;
+			new++;
+			if (do_defines && def_state != OUTSIDE) {
+				fputs(end_defined, ofp);
+				def_state = OUTSIDE;
+			}
+		}
+	}
+	if (new <= pat_end && pch_char(new) == '+') {
+		copy_till(where + old - 1, false);
+		if (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 (do_defines && def_state != OUTSIDE) {
+		fputs(end_defined, ofp);
+	}
+}
+
+/*
+ * Open the new file.
+ */
+static void
+init_output(const char *name)
+{
+	ofp = fopen(name, "w");
+	if (ofp == NULL)
+		pfatal("can't create %s", name);
+}
+
+/*
+ * Open a file to put hunks we can't locate.
+ */
+static void
+init_reject(const char *name)
+{
+	rejfp = fopen(name, "w");
+	if (rejfp == NULL)
+		pfatal("can't create %s", name);
+}
+
+/*
+ * Copy input file to output, up to wherever hunk is to be applied.
+ * If endoffile is true, treat the last line specially since it may
+ * lack a newline.
+ */
+static void
+copy_till(LINENUM lastline, bool endoffile)
+{
+	if (last_frozen_line > lastline)
+		fatal("misordered hunks! output would be garbled\n");
+	while (last_frozen_line < lastline) {
+		if (++last_frozen_line == lastline && endoffile)
+			dump_line(last_frozen_line, !last_line_missing_eol);
+		else
+			dump_line(last_frozen_line, true);
+	}
+}
+
+/*
+ * Finish copying the input file to the output file.
+ */
+static void
+spew_output(void)
+{
+#ifdef DEBUGGING
+	if (debug & 256)
+		say("il=%ld lfl=%ld\n", input_lines, last_frozen_line);
+#endif
+	if (input_lines)
+		copy_till(input_lines, true);	/* dump remainder of file */
+	fclose(ofp);
+	ofp = NULL;
+}
+
+/*
+ * Copy one line from input to output.
+ */
+static void
+dump_line(LINENUM line, bool write_newline)
+{
+	char	*s;
+
+	s = ifetch(line, 0);
+	if (s == NULL)
+		return;
+	/* Note: string is not NUL terminated. */
+	for (; *s != '\n'; s++)
+		putc(*s, ofp);
+	if (write_newline)
+		putc('\n', ofp);
+}
+
+/*
+ * Does the patch pattern match at line base+offset?
+ */
+static bool
+patch_match(LINENUM base, LINENUM offset, LINENUM fuzz)
+{
+	LINENUM		pline = 1 + fuzz;
+	LINENUM		iline;
+	LINENUM		pat_lines = pch_ptrn_lines() - fuzz;
+	const char	*ilineptr;
+	const char	*plineptr;
+	short		plinelen;
+
+	for (iline = base + offset + fuzz; pline <= pat_lines; pline++, iline++) {
+		ilineptr = ifetch(iline, offset >= 0);
+		if (ilineptr == NULL)
+			return false;
+		plineptr = pfetch(pline);
+		plinelen = pch_line_len(pline);
+		if (canonicalize) {
+			if (!similar(ilineptr, plineptr, plinelen))
+				return false;
+		} else if (strnNE(ilineptr, plineptr, plinelen))
+			return false;
+		if (iline == input_lines) {
+			/*
+			 * We are looking at the last line of the file.
+			 * If the file has no eol, the patch line should
+			 * not have one either and vice-versa. Note that
+			 * plinelen > 0.
+			 */
+			if (last_line_missing_eol) {
+				if (plineptr[plinelen - 1] == '\n')
+					return false;
+			} else {
+				if (plineptr[plinelen - 1] != '\n')
+					return false;
+			}
+		}
+	}
+	return true;
+}
+
+/*
+ * Do two lines match with canonicalized white space?
+ */
+static bool
+similar(const char *a, const char *b, int len)
+{
+	while (len) {
+		if (isspace((unsigned char)*b)) { /* whitespace (or \n) to match? */
+			if (!isspace((unsigned char)*a))
+				return false;	/* no corresponding whitespace */
+			while (len && isspace((unsigned char)*b) && *b != '\n')
+				b++, len--;	/* skip pattern whitespace */
+			while (isspace((unsigned char)*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 */
+}