xref: /freebsd/usr.bin/patch/util.c (revision 0afa8e065e14bb8fd338d75690e0238c00167d40)
1 /*-
2  * Copyright 1986, Larry Wall
3  *
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.
8  *
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
19  * SUCH DAMAGE.
20  *
21  * patch - a program to apply diffs to original files
22  *
23  * -C option added in 1998, original code by Marc Espie, based on FreeBSD
24  * behaviour
25  *
26  * $OpenBSD: util.c,v 1.35 2010/07/24 01:10:12 ray Exp $
27  * $FreeBSD$
28  */
29 
30 #include <sys/stat.h>
31 
32 #include <ctype.h>
33 #include <errno.h>
34 #include <fcntl.h>
35 #include <libgen.h>
36 #include <limits.h>
37 #include <paths.h>
38 #include <signal.h>
39 #include <stdarg.h>
40 #include <stdlib.h>
41 #include <stdio.h>
42 #include <string.h>
43 #include <unistd.h>
44 
45 #include "common.h"
46 #include "util.h"
47 #include "backupfile.h"
48 #include "pathnames.h"
49 
50 /* Rename a file, copying it if necessary. */
51 
52 int
53 move_file(const char *from, const char *to)
54 {
55 	int	fromfd;
56 	ssize_t	i;
57 
58 	/* to stdout? */
59 
60 	if (strEQ(to, "-")) {
61 #ifdef DEBUGGING
62 		if (debug & 4)
63 			say("Moving %s to stdout.\n", from);
64 #endif
65 		fromfd = open(from, O_RDONLY);
66 		if (fromfd < 0)
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");
71 		close(fromfd);
72 		return 0;
73 	}
74 	if (backup_file(to) < 0) {
75 		say("Can't backup %s, output is in %s: %s\n", to, from,
76 		    strerror(errno));
77 		return -1;
78 	}
79 #ifdef DEBUGGING
80 	if (debug & 4)
81 		say("Moving %s to %s.\n", from, to);
82 #endif
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));
87 			return -1;
88 		}
89 	}
90 	return 0;
91 }
92 
93 /* Backup the original file.  */
94 
95 int
96 backup_file(const char *orig)
97 {
98 	struct stat	filestat;
99 	char		bakname[PATH_MAX], *s, *simplename;
100 	dev_t		orig_device;
101 	ino_t		orig_inode;
102 
103 	if (backup_type == none || stat(orig, &filestat) != 0)
104 		return 0;			/* nothing to do */
105 	/*
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.
109 	 */
110 	if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
111 		unlink(orig);
112 		return 0;
113 	}
114 	orig_device = filestat.st_dev;
115 	orig_inode = filestat.st_ino;
116 
117 	if (origprae) {
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);
121 	} else {
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);
126 		free(s);
127 	}
128 
129 	if ((simplename = strrchr(bakname, '/')) != NULL)
130 		simplename = simplename + 1;
131 	else
132 		simplename = bakname;
133 
134 	/*
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.
138 	 */
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++)
143 			;
144 		if (*s)
145 			*s = toupper((unsigned char)*s);
146 		else
147 			memmove(simplename, simplename + 1,
148 			    strlen(simplename + 1) + 1);
149 	}
150 #ifdef DEBUGGING
151 	if (debug & 4)
152 		say("Moving %s to %s.\n", orig, bakname);
153 #endif
154 	if (rename(orig, bakname) < 0) {
155 		if (errno != EXDEV || copy_file(orig, bakname) < 0)
156 			return -1;
157 	}
158 	return 0;
159 }
160 
161 /*
162  * Copy a file.
163  */
164 int
165 copy_file(const char *from, const char *to)
166 {
167 	int	tofd, fromfd;
168 	ssize_t	i;
169 
170 	tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
171 	if (tofd < 0)
172 		return -1;
173 	fromfd = open(from, O_RDONLY, 0);
174 	if (fromfd < 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);
179 	close(fromfd);
180 	close(tofd);
181 	return 0;
182 }
183 
184 /*
185  * Allocate a unique area for a string.
186  */
187 char *
188 savestr(const char *s)
189 {
190 	char	*rv;
191 
192 	if (!s)
193 		s = "Oops";
194 	rv = strdup(s);
195 	if (rv == NULL) {
196 		if (using_plan_a)
197 			out_of_mem = true;
198 		else
199 			fatal("out of memory\n");
200 	}
201 	return rv;
202 }
203 
204 /*
205  * Allocate a unique area for a string.  Call fatal if out of memory.
206  */
207 char *
208 xstrdup(const char *s)
209 {
210 	char	*rv;
211 
212 	if (!s)
213 		s = "Oops";
214 	rv = strdup(s);
215 	if (rv == NULL)
216 		fatal("out of memory\n");
217 	return rv;
218 }
219 
220 /*
221  * Vanilla terminal output (buffered).
222  */
223 void
224 say(const char *fmt, ...)
225 {
226 	va_list	ap;
227 
228 	va_start(ap, fmt);
229 	vfprintf(stdout, fmt, ap);
230 	va_end(ap);
231 	fflush(stdout);
232 }
233 
234 /*
235  * Terminal output, pun intended.
236  */
237 void
238 fatal(const char *fmt, ...)
239 {
240 	va_list	ap;
241 
242 	va_start(ap, fmt);
243 	fprintf(stderr, "patch: **** ");
244 	vfprintf(stderr, fmt, ap);
245 	va_end(ap);
246 	my_exit(2);
247 }
248 
249 /*
250  * Say something from patch, something from the system, then silence . . .
251  */
252 void
253 pfatal(const char *fmt, ...)
254 {
255 	va_list	ap;
256 	int	errnum = errno;
257 
258 	fprintf(stderr, "patch: **** ");
259 	va_start(ap, fmt);
260 	vfprintf(stderr, fmt, ap);
261 	va_end(ap);
262 	fprintf(stderr, ": %s\n", strerror(errnum));
263 	my_exit(2);
264 }
265 
266 /*
267  * Get a response from the user via /dev/tty
268  */
269 void
270 ask(const char *fmt, ...)
271 {
272 	va_list	ap;
273 	ssize_t	nr = 0;
274 	static	int ttyfd = -1;
275 
276 	va_start(ap, fmt);
277 	vfprintf(stdout, fmt, ap);
278 	va_end(ap);
279 	fflush(stdout);
280 	if (ttyfd < 0)
281 		ttyfd = open(_PATH_TTY, O_RDONLY);
282 	if (ttyfd >= 0) {
283 		if ((nr = read(ttyfd, buf, buf_size)) > 0 &&
284 		    buf[nr - 1] == '\n')
285 			buf[nr - 1] = '\0';
286 	}
287 	if (ttyfd < 0 || nr <= 0) {
288 		/* no tty or error reading, pretend user entered 'return' */
289 		putchar('\n');
290 		buf[0] = '\0';
291 	}
292 }
293 
294 /*
295  * How to handle certain events when not in a critical region.
296  */
297 void
298 set_signals(int reset)
299 {
300 	static sig_t	hupval, intval;
301 
302 	if (!reset) {
303 		hupval = signal(SIGHUP, SIG_IGN);
304 		if (hupval != SIG_IGN)
305 			hupval = my_exit;
306 		intval = signal(SIGINT, SIG_IGN);
307 		if (intval != SIG_IGN)
308 			intval = my_exit;
309 	}
310 	signal(SIGHUP, hupval);
311 	signal(SIGINT, intval);
312 }
313 
314 /*
315  * How to handle certain events when in a critical region.
316  */
317 void
318 ignore_signals(void)
319 {
320 	signal(SIGHUP, SIG_IGN);
321 	signal(SIGINT, SIG_IGN);
322 }
323 
324 /*
325  * Make sure we'll have the directories to create a file. If `striplast' is
326  * true, ignore the last element of `filename'.
327  */
328 
329 void
330 makedirs(const char *filename, bool striplast)
331 {
332 	char	*tmpbuf;
333 
334 	if ((tmpbuf = strdup(filename)) == NULL)
335 		fatal("out of memory\n");
336 
337 	if (striplast) {
338 		char	*s = strrchr(tmpbuf, '/');
339 		if (s == NULL) {
340 			free(tmpbuf);
341 			return;	/* nothing to be done */
342 		}
343 		*s = '\0';
344 	}
345 	if (mkpath(tmpbuf) != 0)
346 		pfatal("creation of %s failed", tmpbuf);
347 	free(tmpbuf);
348 }
349 
350 /*
351  * Make filenames more reasonable.
352  */
353 char *
354 fetchname(const char *at, bool *exists, int strip_leading)
355 {
356 	char		*fullname, *name, *t;
357 	int		sleading, tab;
358 	struct stat	filestat;
359 
360 	if (at == NULL || *at == '\0')
361 		return NULL;
362 	while (isspace((unsigned char)*at))
363 		at++;
364 #ifdef DEBUGGING
365 	if (debug & 128)
366 		say("fetchname %s %d\n", at, strip_leading);
367 #endif
368 	/* So files can be created by diffing against /dev/null.  */
369 	if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1)) {
370 		*exists = true;
371 		return NULL;
372 	}
373 	name = fullname = t = savestr(at);
374 
375 	tab = strchr(t, '\t') != NULL;
376 	/* Strip off up to `strip_leading' path components and NUL terminate. */
377 	for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
378 	    !isspace((unsigned char)*t)); t++) {
379 		if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
380 			if (--sleading >= 0)
381 				name = t + 1;
382 	}
383 	*t = '\0';
384 
385 	/*
386 	 * If no -p option was given (957 is the default value!), we were
387 	 * given a relative pathname, and the leading directories that we
388 	 * just stripped off all exist, put them back on.
389 	 */
390 	if (strip_leading == 957 && name != fullname && *fullname != '/') {
391 		name[-1] = '\0';
392 		if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
393 			name[-1] = '/';
394 			name = fullname;
395 		}
396 	}
397 	name = savestr(name);
398 	free(fullname);
399 
400 	*exists = stat(name, &filestat) == 0;
401 	return name;
402 }
403 
404 void
405 version(void)
406 {
407 	printf("patch 2.0-12u11 FreeBSD\n");
408 	my_exit(EXIT_SUCCESS);
409 }
410 
411 /*
412  * Exit with cleanup.
413  */
414 void
415 my_exit(int status)
416 {
417 	unlink(TMPINNAME);
418 	if (!toutkeep)
419 		unlink(TMPOUTNAME);
420 	if (!trejkeep)
421 		unlink(TMPREJNAME);
422 	unlink(TMPPATNAME);
423 	exit(status);
424 }
425