2 * Copyright 1986, Larry Wall
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following condition is met:
6 * 1. Redistributions of source code must retain the above copyright notice,
7 * this condition and the following disclaimer.
9 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
10 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
11 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
12 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
13 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
14 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
15 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
16 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
17 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
18 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
21 * patch - a program to apply diffs to original files
23 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
26 * $OpenBSD: util.c,v 1.35 2010/07/24 01:10:12 ray Exp $
27 * $FreeBSD: head/usr.bin/patch/util.c 255894 2013-09-26 18:00:45Z delphij $
30 #include <sys/param.h>
47 #include "backupfile.h"
48 #include "pathnames.h"
50 /* Rename a file, copying it if necessary. */
53 move_file(const char *from, const char *to)
63 say("Moving %s to stdout.\n", from);
65 fromfd = open(from, O_RDONLY);
67 pfatal("internal error, can't reopen %s", from);
68 while ((i = read(fromfd, buf, buf_size)) > 0)
69 if (write(STDOUT_FILENO, buf, i) != i)
70 pfatal("write failed");
74 if (backup_file(to) < 0) {
75 say("Can't backup %s, output is in %s: %s\n", to, from,
81 say("Moving %s to %s.\n", from, to);
83 if (rename(from, to) < 0) {
84 if (errno != EXDEV || copy_file(from, to) < 0) {
85 say("Can't create %s, output is in %s: %s\n",
86 to, from, strerror(errno));
93 /* Backup the original file. */
96 backup_file(const char *orig)
99 char bakname[MAXPATHLEN], *s, *simplename;
103 if (backup_type == none || stat(orig, &filestat) != 0)
104 return 0; /* nothing to do */
106 * If the user used zero prefixes or suffixes, then
107 * he doesn't want backups. Yet we have to remove
108 * orig to break possible hardlinks.
110 if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
114 orig_device = filestat.st_dev;
115 orig_inode = filestat.st_ino;
118 if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
119 strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
120 fatal("filename %s too long for buffer\n", origprae);
122 if ((s = find_backup_file_name(orig)) == NULL)
123 fatal("out of memory\n");
124 if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
125 fatal("filename %s too long for buffer\n", s);
129 if ((simplename = strrchr(bakname, '/')) != NULL)
130 simplename = simplename + 1;
132 simplename = bakname;
135 * Find a backup name that is not the same file. Change the
136 * first lowercase char into uppercase; if that isn't
137 * sufficient, chop off the first char and try again.
139 while (stat(bakname, &filestat) == 0 &&
140 orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
141 /* Skip initial non-lowercase chars. */
142 for (s = simplename; *s && !islower((unsigned char)*s); s++)
145 *s = toupper((unsigned char)*s);
147 memmove(simplename, simplename + 1,
148 strlen(simplename + 1) + 1);
152 say("Moving %s to %s.\n", orig, bakname);
154 if (rename(orig, bakname) < 0) {
155 if (errno != EXDEV || copy_file(orig, bakname) < 0)
165 copy_file(const char *from, const char *to)
170 tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
173 fromfd = open(from, O_RDONLY, 0);
175 pfatal("internal error, can't reopen %s", from);
176 while ((i = read(fromfd, buf, buf_size)) > 0)
177 if (write(tofd, buf, i) != i)
178 pfatal("write to %s failed", to);
185 * Allocate a unique area for a string.
188 savestr(const char *s)
199 fatal("out of memory\n");
205 * Vanilla terminal output (buffered).
208 say(const char *fmt, ...)
213 vfprintf(stdout, fmt, ap);
219 * Terminal output, pun intended.
222 fatal(const char *fmt, ...)
227 fprintf(stderr, "patch: **** ");
228 vfprintf(stderr, fmt, ap);
234 * Say something from patch, something from the system, then silence . . .
237 pfatal(const char *fmt, ...)
242 fprintf(stderr, "patch: **** ");
244 vfprintf(stderr, fmt, ap);
246 fprintf(stderr, ": %s\n", strerror(errnum));
251 * Get a response from the user via /dev/tty
254 ask(const char *fmt, ...)
258 static int ttyfd = -1;
261 vfprintf(stdout, fmt, ap);
265 ttyfd = open(_PATH_TTY, O_RDONLY);
267 if ((nr = read(ttyfd, buf, buf_size)) > 0 &&
271 if (ttyfd < 0 || nr <= 0) {
272 /* no tty or error reading, pretend user entered 'return' */
279 * How to handle certain events when not in a critical region.
282 set_signals(int reset)
284 static sig_t hupval, intval;
287 hupval = signal(SIGHUP, SIG_IGN);
288 if (hupval != SIG_IGN)
290 intval = signal(SIGINT, SIG_IGN);
291 if (intval != SIG_IGN)
294 signal(SIGHUP, hupval);
295 signal(SIGINT, intval);
299 * How to handle certain events when in a critical region.
304 signal(SIGHUP, SIG_IGN);
305 signal(SIGINT, SIG_IGN);
309 * Make sure we'll have the directories to create a file. If `striplast' is
310 * true, ignore the last element of `filename'.
314 makedirs(const char *filename, bool striplast)
318 if ((tmpbuf = strdup(filename)) == NULL)
319 fatal("out of memory\n");
322 char *s = strrchr(tmpbuf, '/');
325 return; /* nothing to be done */
329 if (mkpath(tmpbuf) != 0)
330 pfatal("creation of %s failed", tmpbuf);
335 * Make filenames more reasonable.
338 fetchname(const char *at, bool *exists, int strip_leading)
340 char *fullname, *name, *t;
342 struct stat filestat;
344 if (at == NULL || *at == '\0')
346 while (isspace((unsigned char)*at))
350 say("fetchname %s %d\n", at, strip_leading);
352 /* So files can be created by diffing against /dev/null. */
353 if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
355 name = fullname = t = savestr(at);
357 tab = strchr(t, '\t') != NULL;
358 /* Strip off up to `strip_leading' path components and NUL terminate. */
359 for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
360 !isspace((unsigned char)*t)); t++) {
361 if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
368 * If no -p option was given (957 is the default value!), we were
369 * given a relative pathname, and the leading directories that we
370 * just stripped off all exist, put them back on.
372 if (strip_leading == 957 && name != fullname && *fullname != '/') {
374 if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
379 name = savestr(name);
382 *exists = stat(name, &filestat) == 0;
387 * Takes the name returned by fetchname and looks in RCS/SCCS directories
388 * for a checked in version.
391 checked_in(char *file)
393 char *filebase, *filedir, tmpbuf[MAXPATHLEN];
394 struct stat filestat;
396 filebase = basename(file);
397 filedir = dirname(file);
399 #define try(f, a1, a2, a3) \
400 (snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0)
402 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
403 try("%s/RCS/%s%s", filedir, filebase, "") ||
404 try("%s/%s%s", filedir, filebase, RCSSUFFIX) ||
405 try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
406 try("%s/%s%s", filedir, SCCSPREFIX, filebase))
415 fprintf(stderr, "patch 2.0-12u10\n");
416 my_exit(EXIT_SUCCESS);