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 $
46 #include "backupfile.h"
47 #include "pathnames.h"
49 /* Rename a file, copying it if necessary. */
52 move_file(const char *from, const char *to)
62 say("Moving %s to stdout.\n", from);
64 fromfd = open(from, O_RDONLY);
66 pfatal("internal error, can't reopen %s", from);
67 while ((i = read(fromfd, buf, buf_size)) > 0)
68 if (write(STDOUT_FILENO, buf, i) != i)
69 pfatal("write failed");
73 if (backup_file(to) < 0) {
74 say("Can't backup %s, output is in %s: %s\n", to, from,
80 say("Moving %s to %s.\n", from, to);
82 if (rename(from, to) < 0) {
83 if (errno != EXDEV || copy_file(from, to) < 0) {
84 say("Can't create %s, output is in %s: %s\n",
85 to, from, strerror(errno));
92 /* Backup the original file. */
95 backup_file(const char *orig)
98 char bakname[PATH_MAX], *s, *simplename;
102 if (backup_type == none || stat(orig, &filestat) != 0)
103 return 0; /* nothing to do */
105 * If the user used zero prefixes or suffixes, then
106 * he doesn't want backups. Yet we have to remove
107 * orig to break possible hardlinks.
109 if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
113 orig_device = filestat.st_dev;
114 orig_inode = filestat.st_ino;
117 if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
118 strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
119 fatal("filename %s too long for buffer\n", origprae);
121 if ((s = find_backup_file_name(orig)) == NULL)
122 fatal("out of memory\n");
123 if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
124 fatal("filename %s too long for buffer\n", s);
128 if ((simplename = strrchr(bakname, '/')) != NULL)
129 simplename = simplename + 1;
131 simplename = bakname;
134 * Find a backup name that is not the same file. Change the
135 * first lowercase char into uppercase; if that isn't
136 * sufficient, chop off the first char and try again.
138 while (stat(bakname, &filestat) == 0 &&
139 orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
140 /* Skip initial non-lowercase chars. */
141 for (s = simplename; *s && !islower((unsigned char)*s); s++)
144 *s = toupper((unsigned char)*s);
146 memmove(simplename, simplename + 1,
147 strlen(simplename + 1) + 1);
151 say("Moving %s to %s.\n", orig, bakname);
153 if (rename(orig, bakname) < 0) {
154 if (errno != EXDEV || copy_file(orig, bakname) < 0)
164 copy_file(const char *from, const char *to)
169 tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
172 fromfd = open(from, O_RDONLY, 0);
174 pfatal("internal error, can't reopen %s", from);
175 while ((i = read(fromfd, buf, buf_size)) > 0)
176 if (write(tofd, buf, i) != i)
177 pfatal("write to %s failed", to);
184 * Allocate a unique area for a string.
187 savestr(const char *s)
198 fatal("out of memory\n");
204 * Allocate a unique area for a string. Call fatal if out of memory.
207 xstrdup(const char *s)
215 fatal("out of memory\n");
220 * Vanilla terminal output (buffered).
223 say(const char *fmt, ...)
228 vfprintf(stdout, fmt, ap);
234 * Terminal output, pun intended.
237 fatal(const char *fmt, ...)
242 fprintf(stderr, "patch: **** ");
243 vfprintf(stderr, fmt, ap);
249 * Say something from patch, something from the system, then silence . . .
252 pfatal(const char *fmt, ...)
257 fprintf(stderr, "patch: **** ");
259 vfprintf(stderr, fmt, ap);
261 fprintf(stderr, ": %s\n", strerror(errnum));
266 * Get a response from the user via /dev/tty
269 ask(const char *fmt, ...)
273 static int ttyfd = -1;
276 vfprintf(stdout, fmt, ap);
280 ttyfd = open(_PATH_TTY, O_RDONLY);
282 if ((nr = read(ttyfd, buf, buf_size)) > 0 &&
286 if (ttyfd < 0 || nr <= 0) {
287 /* no tty or error reading, pretend user entered 'return' */
294 * How to handle certain events when not in a critical region.
297 set_signals(int reset)
299 static sig_t hupval, intval;
302 hupval = signal(SIGHUP, SIG_IGN);
303 if (hupval != SIG_IGN)
305 intval = signal(SIGINT, SIG_IGN);
306 if (intval != SIG_IGN)
309 signal(SIGHUP, hupval);
310 signal(SIGINT, intval);
314 * How to handle certain events when in a critical region.
319 signal(SIGHUP, SIG_IGN);
320 signal(SIGINT, SIG_IGN);
324 * Make sure we'll have the directories to create a file. If `striplast' is
325 * true, ignore the last element of `filename'.
329 makedirs(const char *filename, bool striplast)
333 if ((tmpbuf = strdup(filename)) == NULL)
334 fatal("out of memory\n");
337 char *s = strrchr(tmpbuf, '/');
340 return; /* nothing to be done */
344 if (mkpath(tmpbuf) != 0)
345 pfatal("creation of %s failed", tmpbuf);
350 * Make filenames more reasonable.
353 fetchname(const char *at, bool *exists, int strip_leading)
355 char *fullname, *name, *t;
357 struct stat filestat;
359 if (at == NULL || *at == '\0')
361 while (isspace((unsigned char)*at))
365 say("fetchname %s %d\n", at, strip_leading);
367 /* So files can be created by diffing against /dev/null. */
368 if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1)) {
372 name = fullname = t = savestr(at);
374 tab = strchr(t, '\t') != NULL;
375 /* Strip off up to `strip_leading' path components and NUL terminate. */
376 for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
377 !isspace((unsigned char)*t)); t++) {
378 if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
385 * If no -p option was given (957 is the default value!), we were
386 * given a relative pathname, and the leading directories that we
387 * just stripped off all exist, put them back on.
389 if (strip_leading == 957 && name != fullname && *fullname != '/') {
391 if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
396 name = savestr(name);
399 *exists = stat(name, &filestat) == 0;
406 printf("patch 2.0-12u11 FreeBSD\n");
407 my_exit(EXIT_SUCCESS);