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[dragonfly.git] / usr.bin / patch / util.c
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48d201a5 1/*
573bac56
SW
2 * $OpenBSD: util.c,v 1.29 2004/11/19 20:00:57 otto Exp $
3 * $DragonFly: src/usr.bin/patch/util.c,v 1.4 2005/01/10 21:45:33 swildner Exp $
48d201a5
JS
4 */
5
6/*
7 * patch - a program to apply diffs to original files
8 *
9 * Copyright 1986, Larry Wall
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following condition is met:
13 * 1. Redistributions of source code must retain the above copyright notice,
14 * this condition and the following disclaimer.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
29 * behaviour
30 */
31
32#include <sys/param.h>
33#include <sys/stat.h>
34
35#include <ctype.h>
36#include <errno.h>
37#include <fcntl.h>
38#include <libgen.h>
39#include <paths.h>
40#include <stdarg.h>
41#include <stdlib.h>
42#include <stdio.h>
43#include <string.h>
44#include <unistd.h>
45
46#include "common.h"
47#include "util.h"
48#include "backupfile.h"
49#include "pathnames.h"
50
51
52/* Rename a file, copying it if necessary. */
53
54int
55move_file(const char *from, const char *to)
56{
57 int fromfd;
58 ssize_t i;
59
60 /* to stdout? */
61
62 if (strEQ(to, "-")) {
63#ifdef DEBUGGING
64 if (debug & 4)
65 say("Moving %s to stdout.\n", from);
66#endif
67 fromfd = open(from, O_RDONLY);
68 if (fromfd < 0)
69 pfatal("internal error, can't reopen %s", from);
70 while ((i = read(fromfd, buf, sizeof buf)) > 0)
71 if (write(STDOUT_FILENO, buf, i) != i)
72 pfatal("write failed");
73 close(fromfd);
74 return 0;
75 }
76 if (backup_file(to) < 0) {
77 say("Can't backup %s, output is in %s: %s\n", to, from,
78 strerror(errno));
79 return -1;
80 }
81#ifdef DEBUGGING
82 if (debug & 4)
83 say("Moving %s to %s.\n", from, to);
84#endif
85 if (rename(from, to) < 0) {
86 if (errno != EXDEV || copy_file(from, to) < 0) {
87 say("Can't create %s, output is in %s: %s\n",
88 to, from, strerror(errno));
89 return -1;
90 }
91 }
92 return 0;
93}
94
95/* Backup the original file. */
96
97int
98backup_file(const char *orig)
99{
100 struct stat filestat;
101 char bakname[MAXPATHLEN], *s, *simplename;
102 dev_t orig_device;
103 ino_t orig_inode;
104
105 if (backup_type == none || stat(orig, &filestat) != 0)
106 return 0; /* nothing to do */
107 orig_device = filestat.st_dev;
108 orig_inode = filestat.st_ino;
109
110 if (origprae) {
111 if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
112 strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
113 fatal("filename %s too long for buffer\n", origprae);
114 } else {
115 if ((s = find_backup_file_name(orig)) == NULL)
116 fatal("out of memory\n");
117 if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
118 fatal("filename %s too long for buffer\n", s);
119 free(s);
120 }
121
122 if ((simplename = strrchr(bakname, '/')) != NULL)
123 simplename = simplename + 1;
124 else
125 simplename = bakname;
126
127 /*
128 * Find a backup name that is not the same file. Change the
129 * first lowercase char into uppercase; if that isn't
130 * sufficient, chop off the first char and try again.
131 */
132 while (stat(bakname, &filestat) == 0 &&
133 orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
134 /* Skip initial non-lowercase chars. */
135 for (s = simplename; *s && !islower(*s); s++)
136 ;
137 if (*s)
138 *s = toupper(*s);
139 else
140 memmove(simplename, simplename + 1,
141 strlen(simplename + 1) + 1);
142 }
143#ifdef DEBUGGING
144 if (debug & 4)
145 say("Moving %s to %s.\n", orig, bakname);
146#endif
147 if (rename(orig, bakname) < 0) {
148 if (errno != EXDEV || copy_file(orig, bakname) < 0)
149 return -1;
150 }
151 return 0;
152}
153
154/*
155 * Copy a file.
156 */
157int
158copy_file(const char *from, const char *to)
159{
160 int tofd, fromfd;
161 ssize_t i;
162
163 tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
164 if (tofd < 0)
165 return -1;
166 fromfd = open(from, O_RDONLY, 0);
167 if (fromfd < 0)
168 pfatal("internal error, can't reopen %s", from);
169 while ((i = read(fromfd, buf, sizeof buf)) > 0)
170 if (write(tofd, buf, i) != i)
171 pfatal("write to %s failed", to);
172 close(fromfd);
173 close(tofd);
174 return 0;
175}
176
177/*
178 * Allocate a unique area for a string.
179 */
180char *
181savestr(const char *s)
182{
183 char *rv;
184
185 if (!s)
186 s = "Oops";
187 rv = strdup(s);
188 if (rv == NULL) {
189 if (using_plan_a)
190 out_of_mem = true;
191 else
192 fatal("out of memory\n");
193 }
194 return rv;
195}
196
197/*
198 * Vanilla terminal output (buffered).
199 */
200void
201say(const char *fmt, ...)
202{
203 va_list ap;
204
205 va_start(ap, fmt);
206 vfprintf(stderr, fmt, ap);
207 va_end(ap);
208 fflush(stderr);
209}
210
211/*
212 * Terminal output, pun intended.
213 */
214void
215fatal(const char *fmt, ...)
216{
217 va_list ap;
218
219 va_start(ap, fmt);
220 fprintf(stderr, "patch: **** ");
221 vfprintf(stderr, fmt, ap);
222 va_end(ap);
223 my_exit(2);
224}
225
226/*
227 * Say something from patch, something from the system, then silence . . .
228 */
229void
230pfatal(const char *fmt, ...)
231{
232 va_list ap;
233 int errnum = errno;
234
235 fprintf(stderr, "patch: **** ");
236 va_start(ap, fmt);
237 vfprintf(stderr, fmt, ap);
238 va_end(ap);
239 fprintf(stderr, ": %s\n", strerror(errnum));
240 my_exit(2);
241}
242
243/*
244 * Get a response from the user via /dev/tty
245 */
246void
247ask(const char *fmt, ...)
248{
249 va_list ap;
250 ssize_t nr = 0;
251 static int ttyfd = -1;
252
253 va_start(ap, fmt);
254 vfprintf(stdout, fmt, ap);
255 va_end(ap);
256 fflush(stdout);
257 if (ttyfd < 0)
258 ttyfd = open(_PATH_TTY, O_RDONLY);
259 if (ttyfd >= 0) {
260 if ((nr = read(ttyfd, buf, sizeof(buf))) > 0 &&
261 buf[nr - 1] == '\n')
262 buf[nr - 1] = '\0';
263 }
264 if (ttyfd < 0 || nr <= 0) {
265 /* no tty or error reading, pretend user entered 'return' */
266 putchar('\n');
267 buf[0] = '\0';
268 }
269}
270
271/*
272 * How to handle certain events when not in a critical region.
273 */
274void
275set_signals(int reset)
276{
277 static sig_t hupval, intval;
278
279 if (!reset) {
280 hupval = signal(SIGHUP, SIG_IGN);
281 if (hupval != SIG_IGN)
f9ea5d32 282 hupval = my_exit;
48d201a5
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283 intval = signal(SIGINT, SIG_IGN);
284 if (intval != SIG_IGN)
f9ea5d32 285 intval = my_exit;
48d201a5
JS
286 }
287 signal(SIGHUP, hupval);
288 signal(SIGINT, intval);
289}
290
291/*
292 * How to handle certain events when in a critical region.
293 */
294void
295ignore_signals(void)
296{
297 signal(SIGHUP, SIG_IGN);
298 signal(SIGINT, SIG_IGN);
299}
300
301/*
302 * Make sure we'll have the directories to create a file. If `striplast' is
303 * true, ignore the last element of `filename'.
304 */
305
306void
307makedirs(const char *filename, bool striplast)
308{
309 char *tmpbuf;
310
311 if ((tmpbuf = strdup(filename)) == NULL)
312 fatal("out of memory\n");
313
314 if (striplast) {
315 char *s = strrchr(tmpbuf, '/');
316 if (s == NULL)
317 return; /* nothing to be done */
318 *s = '\0';
319 }
320 if (snprintf(buf, sizeof(buf), "%s -p %s", _PATH_MKDIR, tmpbuf)
321 >= (int)sizeof(buf))
322 fatal("buffer too small to hold %.20s...\n", tmpbuf);
323
324 if (system(buf))
325 pfatal("%.40s failed", buf);
326}
327
328/*
329 * Make filenames more reasonable.
330 */
331char *
332fetchname(const char *at, bool *exists, int strip_leading)
333{
334 char *fullname, *name, *t;
f7e25d55 335 int sleading, tab;
48d201a5
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336 struct stat filestat;
337
338 if (at == NULL || *at == '\0')
339 return NULL;
340 while (isspace(*at))
341 at++;
342#ifdef DEBUGGING
343 if (debug & 128)
344 say("fetchname %s %d\n", at, strip_leading);
345#endif
346 /* So files can be created by diffing against /dev/null. */
347 if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
348 return NULL;
349 name = fullname = t = savestr(at);
350
f7e25d55 351 tab = strchr(t, '\t') != NULL;
48d201a5 352 /* Strip off up to `strip_leading' path components and NUL terminate. */
f7e25d55
SW
353 for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
354 !isspace(*t)); t++) {
48d201a5
JS
355 if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
356 if (--sleading >= 0)
357 name = t + 1;
358 }
359 *t = '\0';
360
361 /*
362 * If no -p option was given (957 is the default value!), we were
363 * given a relative pathname, and the leading directories that we
364 * just stripped off all exist, put them back on.
365 */
366 if (strip_leading == 957 && name != fullname && *fullname != '/') {
367 name[-1] = '\0';
368 if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
369 name[-1] = '/';
370 name = fullname;
371 }
372 }
373 name = savestr(name);
374 free(fullname);
375
376 *exists = stat(name, &filestat) == 0;
377 return name;
378}
379
380/*
381 * Takes the name returned by fetchname and looks in RCS/SCCS directories
382 * for a checked in version.
383 */
384char *
385checked_in(char *file)
386{
387 char *filebase, *filedir, tmpbuf[MAXPATHLEN];
388 struct stat filestat;
389
390 filebase = basename(file);
391 filedir = dirname(file);
392
393#define try(f, a1, a2, a3) \
394(snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0)
395
396 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
397 try("%s/RCS/%s%s", filedir, filebase, "") ||
398 try("%s/%s%s", filedir, filebase, RCSSUFFIX) ||
399 try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
400 try("%s/%s%s", filedir, SCCSPREFIX, filebase))
401 return file;
402
403 return NULL;
404}
405
406void
407version(void)
408{
409 fprintf(stderr, "Patch version 2.0-12u8-OpenBSD\n");
410 my_exit(EXIT_SUCCESS);
411}
412
413/*
414 * Exit with cleanup.
415 */
416void
417my_exit(int status)
418{
419 unlink(TMPINNAME);
420 if (!toutkeep)
421 unlink(TMPOUTNAME);
422 if (!trejkeep)
423 unlink(TMPREJNAME);
424 unlink(TMPPATNAME);
425 exit(status);
426}