summaryrefslogtreecommitdiffstats
path: root/usr.bin/patch/util.c
blob: 6980676302082ad4a74796ae97e3be90750f52de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
/*-
 * 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.
 * 
 * patch - a program to apply diffs to original files
 *
 * -C option added in 1998, original code by Marc Espie, based on FreeBSD
 * behaviour
 *
 * $OpenBSD: util.c,v 1.35 2010/07/24 01:10:12 ray Exp $
 * $FreeBSD$
 */

#include <sys/param.h>
#include <sys/stat.h>

#include <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <paths.h>
#include <signal.h>
#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "common.h"
#include "util.h"
#include "backupfile.h"
#include "pathnames.h"

/* Rename a file, copying it if necessary. */

int
move_file(const char *from, const char *to)
{
	int	fromfd;
	ssize_t	i;

	/* to stdout? */

	if (strEQ(to, "-")) {
#ifdef DEBUGGING
		if (debug & 4)
			say("Moving %s to stdout.\n", from);
#endif
		fromfd = open(from, O_RDONLY);
		if (fromfd < 0)
			pfatal("internal error, can't reopen %s", from);
		while ((i = read(fromfd, buf, buf_size)) > 0)
			if (write(STDOUT_FILENO, buf, i) != i)
				pfatal("write failed");
		close(fromfd);
		return 0;
	}
	if (backup_file(to) < 0) {
		say("Can't backup %s, output is in %s: %s\n", to, from,
		    strerror(errno));
		return -1;
	}
#ifdef DEBUGGING
	if (debug & 4)
		say("Moving %s to %s.\n", from, to);
#endif
	if (rename(from, to) < 0) {
		if (errno != EXDEV || copy_file(from, to) < 0) {
			say("Can't create %s, output is in %s: %s\n",
			    to, from, strerror(errno));
			return -1;
		}
	}
	return 0;
}

/* Backup the original file.  */

int
backup_file(const char *orig)
{
	struct stat	filestat;
	char		bakname[MAXPATHLEN], *s, *simplename;
	dev_t		orig_device;
	ino_t		orig_inode;

	if (backup_type == none || stat(orig, &filestat) != 0)
		return 0;			/* nothing to do */
	/*
	 * If the user used zero prefixes or suffixes, then
	 * he doesn't want backups.  Yet we have to remove
	 * orig to break possible hardlinks.
	 */
	if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) {
		unlink(orig);
		return 0;
	}
	orig_device = filestat.st_dev;
	orig_inode = filestat.st_ino;

	if (origprae) {
		if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) ||
		    strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname))
			fatal("filename %s too long for buffer\n", origprae);
	} else {
		if ((s = find_backup_file_name(orig)) == NULL)
			fatal("out of memory\n");
		if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname))
			fatal("filename %s too long for buffer\n", s);
		free(s);
	}

	if ((simplename = strrchr(bakname, '/')) != NULL)
		simplename = simplename + 1;
	else
		simplename = bakname;

	/*
	 * Find a backup name that is not the same file. Change the
	 * first lowercase char into uppercase; if that isn't
	 * sufficient, chop off the first char and try again.
	 */
	while (stat(bakname, &filestat) == 0 &&
	    orig_device == filestat.st_dev && orig_inode == filestat.st_ino) {
		/* Skip initial non-lowercase chars.  */
		for (s = simplename; *s && !islower((unsigned char)*s); s++)
			;
		if (*s)
			*s = toupper((unsigned char)*s);
		else
			memmove(simplename, simplename + 1,
			    strlen(simplename + 1) + 1);
	}
#ifdef DEBUGGING
	if (debug & 4)
		say("Moving %s to %s.\n", orig, bakname);
#endif
	if (rename(orig, bakname) < 0) {
		if (errno != EXDEV || copy_file(orig, bakname) < 0)
			return -1;
	}
	return 0;
}

/*
 * Copy a file.
 */
int
copy_file(const char *from, const char *to)
{
	int	tofd, fromfd;
	ssize_t	i;

	tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666);
	if (tofd < 0)
		return -1;
	fromfd = open(from, O_RDONLY, 0);
	if (fromfd < 0)
		pfatal("internal error, can't reopen %s", from);
	while ((i = read(fromfd, buf, buf_size)) > 0)
		if (write(tofd, buf, i) != i)
			pfatal("write to %s failed", to);
	close(fromfd);
	close(tofd);
	return 0;
}

/*
 * Allocate a unique area for a string.
 */
char *
savestr(const char *s)
{
	char	*rv;

	if (!s)
		s = "Oops";
	rv = strdup(s);
	if (rv == NULL) {
		if (using_plan_a)
			out_of_mem = true;
		else
			fatal("out of memory\n");
	}
	return rv;
}

/*
 * Vanilla terminal output (buffered).
 */
void
say(const char *fmt, ...)
{
	va_list	ap;

	va_start(ap, fmt);
	vfprintf(stdout, fmt, ap);
	va_end(ap);
	fflush(stdout);
}

/*
 * Terminal output, pun intended.
 */
void
fatal(const char *fmt, ...)
{
	va_list	ap;

	va_start(ap, fmt);
	fprintf(stderr, "patch: **** ");
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	my_exit(2);
}

/*
 * Say something from patch, something from the system, then silence . . .
 */
void
pfatal(const char *fmt, ...)
{
	va_list	ap;
	int	errnum = errno;

	fprintf(stderr, "patch: **** ");
	va_start(ap, fmt);
	vfprintf(stderr, fmt, ap);
	va_end(ap);
	fprintf(stderr, ": %s\n", strerror(errnum));
	my_exit(2);
}

/*
 * Get a response from the user via /dev/tty
 */
void
ask(const char *fmt, ...)
{
	va_list	ap;
	ssize_t	nr = 0;
	static	int ttyfd = -1;

	va_start(ap, fmt);
	vfprintf(stdout, fmt, ap);
	va_end(ap);
	fflush(stdout);
	if (ttyfd < 0)
		ttyfd = open(_PATH_TTY, O_RDONLY);
	if (ttyfd >= 0) {
		if ((nr = read(ttyfd, buf, buf_size)) > 0 &&
		    buf[nr - 1] == '\n')
			buf[nr - 1] = '\0';
	}
	if (ttyfd < 0 || nr <= 0) {
		/* no tty or error reading, pretend user entered 'return' */
		putchar('\n');
		buf[0] = '\0';
	}
}

/*
 * How to handle certain events when not in a critical region.
 */
void
set_signals(int reset)
{
	static sig_t	hupval, intval;

	if (!reset) {
		hupval = signal(SIGHUP, SIG_IGN);
		if (hupval != SIG_IGN)
			hupval = my_exit;
		intval = signal(SIGINT, SIG_IGN);
		if (intval != SIG_IGN)
			intval = my_exit;
	}
	signal(SIGHUP, hupval);
	signal(SIGINT, intval);
}

/*
 * How to handle certain events when in a critical region.
 */
void
ignore_signals(void)
{
	signal(SIGHUP, SIG_IGN);
	signal(SIGINT, SIG_IGN);
}

/*
 * Make sure we'll have the directories to create a file. If `striplast' is
 * true, ignore the last element of `filename'.
 */

void
makedirs(const char *filename, bool striplast)
{
	char	*tmpbuf;

	if ((tmpbuf = strdup(filename)) == NULL)
		fatal("out of memory\n");

	if (striplast) {
		char	*s = strrchr(tmpbuf, '/');
		if (s == NULL) {
			free(tmpbuf);
			return;	/* nothing to be done */
		}
		*s = '\0';
	}
	if (mkpath(tmpbuf) != 0)
		pfatal("creation of %s failed", tmpbuf);
	free(tmpbuf);
}

/*
 * Make filenames more reasonable.
 */
char *
fetchname(const char *at, bool *exists, int strip_leading)
{
	char		*fullname, *name, *t;
	int		sleading, tab;
	struct stat	filestat;

	if (at == NULL || *at == '\0')
		return NULL;
	while (isspace((unsigned char)*at))
		at++;
#ifdef DEBUGGING
	if (debug & 128)
		say("fetchname %s %d\n", at, strip_leading);
#endif
	/* So files can be created by diffing against /dev/null.  */
	if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1))
		return NULL;
	name = fullname = t = savestr(at);

	tab = strchr(t, '\t') != NULL;
	/* Strip off up to `strip_leading' path components and NUL terminate. */
	for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') ||
	    !isspace((unsigned char)*t)); t++) {
		if (t[0] == '/' && t[1] != '/' && t[1] != '\0')
			if (--sleading >= 0)
				name = t + 1;
	}
	*t = '\0';

	/*
	 * If no -p option was given (957 is the default value!), we were
	 * given a relative pathname, and the leading directories that we
	 * just stripped off all exist, put them back on.
	 */
	if (strip_leading == 957 && name != fullname && *fullname != '/') {
		name[-1] = '\0';
		if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) {
			name[-1] = '/';
			name = fullname;
		}
	}
	name = savestr(name);
	free(fullname);

	*exists = stat(name, &filestat) == 0;
	return name;
}

/*
 * Takes the name returned by fetchname and looks in RCS/SCCS directories
 * for a checked in version.
 */
char *
checked_in(char *file)
{
	char		*filebase, *filedir, tmpbuf[MAXPATHLEN];
	struct stat	filestat;

	filebase = basename(file);
	filedir = dirname(file);

#define try(f, a1, a2, a3) \
(snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0)

	if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
	    try("%s/RCS/%s%s", filedir, filebase, "") ||
	    try("%s/%s%s", filedir, filebase, RCSSUFFIX) ||
	    try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
	    try("%s/%s%s", filedir, SCCSPREFIX, filebase))
		return file;

	return NULL;
}

void
version(void)
{
	fprintf(stderr, "patch 2.0-12u10 FreeBSD\n");
	my_exit(EXIT_SUCCESS);
}

/*
 * Exit with cleanup.
 */
void
my_exit(int status)
{
	unlink(TMPINNAME);
	if (!toutkeep)
		unlink(TMPOUTNAME);
	if (!trejkeep)
		unlink(TMPREJNAME);
	unlink(TMPPATNAME);
	exit(status);
}
OpenPOWER on IntegriCloud