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Commit | Line | Data |
---|---|---|
112db553 LT |
1 | /* |
2 | * Various trivial helper wrappers around standard functions | |
3 | */ | |
4 | #include "cache.h" | |
b2141fc1 | 5 | #include "config.h" |
112db553 | 6 | |
f8bb1d94 | 7 | static int memory_limit_check(size_t size, int gentle) |
d41489a6 | 8 | { |
9927d962 SP |
9 | static size_t limit = 0; |
10 | if (!limit) { | |
11 | limit = git_env_ulong("GIT_ALLOC_LIMIT", 0); | |
12 | if (!limit) | |
13 | limit = SIZE_MAX; | |
d41489a6 | 14 | } |
f0d89001 | 15 | if (size > limit) { |
f8bb1d94 | 16 | if (gentle) { |
f0d89001 JH |
17 | error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
18 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
19 | return -1; |
20 | } else | |
f0d89001 JH |
21 | die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
22 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
23 | } |
24 | return 0; | |
d41489a6 NTND |
25 | } |
26 | ||
112db553 LT |
27 | char *xstrdup(const char *str) |
28 | { | |
29 | char *ret = strdup(str); | |
9827d4c1 JK |
30 | if (!ret) |
31 | die("Out of memory, strdup failed"); | |
112db553 LT |
32 | return ret; |
33 | } | |
34 | ||
f8bb1d94 | 35 | static void *do_xmalloc(size_t size, int gentle) |
112db553 | 36 | { |
d41489a6 NTND |
37 | void *ret; |
38 | ||
f8bb1d94 NTND |
39 | if (memory_limit_check(size, gentle)) |
40 | return NULL; | |
d41489a6 | 41 | ret = malloc(size); |
112db553 LT |
42 | if (!ret && !size) |
43 | ret = malloc(1); | |
44 | if (!ret) { | |
9827d4c1 JK |
45 | if (!gentle) |
46 | die("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
47 | (unsigned long)size); | |
48 | else { | |
49 | error("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
50 | (unsigned long)size); | |
51 | return NULL; | |
f8bb1d94 | 52 | } |
112db553 LT |
53 | } |
54 | #ifdef XMALLOC_POISON | |
55 | memset(ret, 0xA5, size); | |
56 | #endif | |
57 | return ret; | |
58 | } | |
59 | ||
f8bb1d94 NTND |
60 | void *xmalloc(size_t size) |
61 | { | |
62 | return do_xmalloc(size, 0); | |
63 | } | |
64 | ||
65 | static void *do_xmallocz(size_t size, int gentle) | |
5bf9219d IL |
66 | { |
67 | void *ret; | |
f8bb1d94 NTND |
68 | if (unsigned_add_overflows(size, 1)) { |
69 | if (gentle) { | |
70 | error("Data too large to fit into virtual memory space."); | |
71 | return NULL; | |
72 | } else | |
73 | die("Data too large to fit into virtual memory space."); | |
74 | } | |
75 | ret = do_xmalloc(size + 1, gentle); | |
76 | if (ret) | |
77 | ((char*)ret)[size] = 0; | |
5bf9219d IL |
78 | return ret; |
79 | } | |
80 | ||
f8bb1d94 NTND |
81 | void *xmallocz(size_t size) |
82 | { | |
83 | return do_xmallocz(size, 0); | |
84 | } | |
85 | ||
86 | void *xmallocz_gently(size_t size) | |
87 | { | |
88 | return do_xmallocz(size, 1); | |
89 | } | |
90 | ||
112db553 LT |
91 | /* |
92 | * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of | |
93 | * "data" to the allocated memory, zero terminates the allocated memory, | |
94 | * and returns a pointer to the allocated memory. If the allocation fails, | |
95 | * the program dies. | |
96 | */ | |
97 | void *xmemdupz(const void *data, size_t len) | |
98 | { | |
5bf9219d | 99 | return memcpy(xmallocz(len), data, len); |
112db553 LT |
100 | } |
101 | ||
102 | char *xstrndup(const char *str, size_t len) | |
103 | { | |
104 | char *p = memchr(str, '\0', len); | |
105 | return xmemdupz(str, p ? p - str : len); | |
106 | } | |
107 | ||
14570dc6 | 108 | int xstrncmpz(const char *s, const char *t, size_t len) |
109 | { | |
110 | int res = strncmp(s, t, len); | |
111 | if (res) | |
112 | return res; | |
113 | return s[len] == '\0' ? 0 : 1; | |
114 | } | |
115 | ||
112db553 LT |
116 | void *xrealloc(void *ptr, size_t size) |
117 | { | |
d41489a6 NTND |
118 | void *ret; |
119 | ||
6479ea4a JK |
120 | if (!size) { |
121 | free(ptr); | |
122 | return xmalloc(0); | |
123 | } | |
124 | ||
f8bb1d94 | 125 | memory_limit_check(size, 0); |
d41489a6 | 126 | ret = realloc(ptr, size); |
9827d4c1 JK |
127 | if (!ret) |
128 | die("Out of memory, realloc failed"); | |
112db553 LT |
129 | return ret; |
130 | } | |
131 | ||
132 | void *xcalloc(size_t nmemb, size_t size) | |
133 | { | |
d41489a6 NTND |
134 | void *ret; |
135 | ||
e7792a74 JK |
136 | if (unsigned_mult_overflows(nmemb, size)) |
137 | die("data too large to fit into virtual memory space"); | |
138 | ||
f8bb1d94 | 139 | memory_limit_check(size * nmemb, 0); |
d41489a6 | 140 | ret = calloc(nmemb, size); |
112db553 LT |
141 | if (!ret && (!nmemb || !size)) |
142 | ret = calloc(1, 1); | |
9827d4c1 JK |
143 | if (!ret) |
144 | die("Out of memory, calloc failed"); | |
112db553 LT |
145 | return ret; |
146 | } | |
147 | ||
0b6806b9 SP |
148 | /* |
149 | * Limit size of IO chunks, because huge chunks only cause pain. OS X | |
150 | * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in | |
382d20e3 | 151 | * the absence of bugs, large chunks can result in bad latencies when |
0b6806b9 | 152 | * you decide to kill the process. |
a983e6ac JH |
153 | * |
154 | * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX | |
155 | * that is smaller than that, clip it to SSIZE_MAX, as a call to | |
156 | * read(2) or write(2) larger than that is allowed to fail. As the last | |
157 | * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value" | |
158 | * to override this, if the definition of SSIZE_MAX given by the platform | |
159 | * is broken. | |
0b6806b9 | 160 | */ |
a983e6ac JH |
161 | #ifndef MAX_IO_SIZE |
162 | # define MAX_IO_SIZE_DEFAULT (8*1024*1024) | |
163 | # if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT) | |
164 | # define MAX_IO_SIZE SSIZE_MAX | |
165 | # else | |
166 | # define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT | |
167 | # endif | |
168 | #endif | |
0b6806b9 | 169 | |
3ff53df7 PT |
170 | /** |
171 | * xopen() is the same as open(), but it die()s if the open() fails. | |
172 | */ | |
173 | int xopen(const char *path, int oflag, ...) | |
174 | { | |
175 | mode_t mode = 0; | |
176 | va_list ap; | |
177 | ||
178 | /* | |
179 | * va_arg() will have undefined behavior if the specified type is not | |
180 | * compatible with the argument type. Since integers are promoted to | |
181 | * ints, we fetch the next argument as an int, and then cast it to a | |
182 | * mode_t to avoid undefined behavior. | |
183 | */ | |
184 | va_start(ap, oflag); | |
185 | if (oflag & O_CREAT) | |
186 | mode = va_arg(ap, int); | |
187 | va_end(ap); | |
188 | ||
189 | for (;;) { | |
190 | int fd = open(path, oflag, mode); | |
191 | if (fd >= 0) | |
192 | return fd; | |
193 | if (errno == EINTR) | |
194 | continue; | |
195 | ||
196 | if ((oflag & O_RDWR) == O_RDWR) | |
197 | die_errno(_("could not open '%s' for reading and writing"), path); | |
198 | else if ((oflag & O_WRONLY) == O_WRONLY) | |
199 | die_errno(_("could not open '%s' for writing"), path); | |
200 | else | |
201 | die_errno(_("could not open '%s' for reading"), path); | |
202 | } | |
203 | } | |
204 | ||
d751dd11 EW |
205 | static int handle_nonblock(int fd, short poll_events, int err) |
206 | { | |
207 | struct pollfd pfd; | |
208 | ||
209 | if (err != EAGAIN && err != EWOULDBLOCK) | |
210 | return 0; | |
211 | ||
212 | pfd.fd = fd; | |
213 | pfd.events = poll_events; | |
214 | ||
215 | /* | |
216 | * no need to check for errors, here; | |
217 | * a subsequent read/write will detect unrecoverable errors | |
218 | */ | |
219 | poll(&pfd, 1, -1); | |
220 | return 1; | |
221 | } | |
222 | ||
112db553 LT |
223 | /* |
224 | * xread() is the same a read(), but it automatically restarts read() | |
225 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
226 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
227 | */ | |
228 | ssize_t xread(int fd, void *buf, size_t len) | |
229 | { | |
230 | ssize_t nr; | |
0b6806b9 | 231 | if (len > MAX_IO_SIZE) |
7cd54d37 | 232 | len = MAX_IO_SIZE; |
112db553 LT |
233 | while (1) { |
234 | nr = read(fd, buf, len); | |
1079c4be SB |
235 | if (nr < 0) { |
236 | if (errno == EINTR) | |
237 | continue; | |
d751dd11 | 238 | if (handle_nonblock(fd, POLLIN, errno)) |
c22f6202 | 239 | continue; |
1079c4be | 240 | } |
112db553 LT |
241 | return nr; |
242 | } | |
243 | } | |
244 | ||
245 | /* | |
246 | * xwrite() is the same a write(), but it automatically restarts write() | |
247 | * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT | |
248 | * GUARANTEE that "len" bytes is written even if the operation is successful. | |
249 | */ | |
250 | ssize_t xwrite(int fd, const void *buf, size_t len) | |
251 | { | |
252 | ssize_t nr; | |
0b6806b9 | 253 | if (len > MAX_IO_SIZE) |
7cd54d37 | 254 | len = MAX_IO_SIZE; |
112db553 LT |
255 | while (1) { |
256 | nr = write(fd, buf, len); | |
ef1cf016 EW |
257 | if (nr < 0) { |
258 | if (errno == EINTR) | |
259 | continue; | |
d751dd11 | 260 | if (handle_nonblock(fd, POLLOUT, errno)) |
ef1cf016 | 261 | continue; |
ef1cf016 EW |
262 | } |
263 | ||
9aa91af0 YM |
264 | return nr; |
265 | } | |
266 | } | |
267 | ||
268 | /* | |
269 | * xpread() is the same as pread(), but it automatically restarts pread() | |
270 | * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES | |
271 | * NOT GUARANTEE that "len" bytes is read even if the data is available. | |
272 | */ | |
273 | ssize_t xpread(int fd, void *buf, size_t len, off_t offset) | |
274 | { | |
275 | ssize_t nr; | |
276 | if (len > MAX_IO_SIZE) | |
277 | len = MAX_IO_SIZE; | |
278 | while (1) { | |
279 | nr = pread(fd, buf, len, offset); | |
280 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
112db553 LT |
281 | continue; |
282 | return nr; | |
283 | } | |
284 | } | |
285 | ||
559e840b JH |
286 | ssize_t read_in_full(int fd, void *buf, size_t count) |
287 | { | |
288 | char *p = buf; | |
289 | ssize_t total = 0; | |
290 | ||
291 | while (count > 0) { | |
292 | ssize_t loaded = xread(fd, p, count); | |
56d7c27a JK |
293 | if (loaded < 0) |
294 | return -1; | |
295 | if (loaded == 0) | |
296 | return total; | |
559e840b JH |
297 | count -= loaded; |
298 | p += loaded; | |
299 | total += loaded; | |
300 | } | |
301 | ||
302 | return total; | |
303 | } | |
304 | ||
305 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
306 | { | |
307 | const char *p = buf; | |
308 | ssize_t total = 0; | |
309 | ||
310 | while (count > 0) { | |
311 | ssize_t written = xwrite(fd, p, count); | |
312 | if (written < 0) | |
313 | return -1; | |
314 | if (!written) { | |
315 | errno = ENOSPC; | |
316 | return -1; | |
317 | } | |
318 | count -= written; | |
319 | p += written; | |
320 | total += written; | |
321 | } | |
322 | ||
323 | return total; | |
324 | } | |
325 | ||
426ddeea YM |
326 | ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset) |
327 | { | |
328 | char *p = buf; | |
329 | ssize_t total = 0; | |
330 | ||
331 | while (count > 0) { | |
332 | ssize_t loaded = xpread(fd, p, count, offset); | |
333 | if (loaded < 0) | |
334 | return -1; | |
335 | if (loaded == 0) | |
336 | return total; | |
337 | count -= loaded; | |
338 | p += loaded; | |
339 | total += loaded; | |
340 | offset += loaded; | |
341 | } | |
342 | ||
343 | return total; | |
344 | } | |
345 | ||
112db553 LT |
346 | int xdup(int fd) |
347 | { | |
348 | int ret = dup(fd); | |
349 | if (ret < 0) | |
d824cbba | 350 | die_errno("dup failed"); |
112db553 LT |
351 | return ret; |
352 | } | |
353 | ||
260eec29 PT |
354 | /** |
355 | * xfopen() is the same as fopen(), but it die()s if the fopen() fails. | |
356 | */ | |
357 | FILE *xfopen(const char *path, const char *mode) | |
358 | { | |
359 | for (;;) { | |
360 | FILE *fp = fopen(path, mode); | |
361 | if (fp) | |
362 | return fp; | |
363 | if (errno == EINTR) | |
364 | continue; | |
365 | ||
366 | if (*mode && mode[1] == '+') | |
367 | die_errno(_("could not open '%s' for reading and writing"), path); | |
368 | else if (*mode == 'w' || *mode == 'a') | |
369 | die_errno(_("could not open '%s' for writing"), path); | |
370 | else | |
371 | die_errno(_("could not open '%s' for reading"), path); | |
372 | } | |
373 | } | |
374 | ||
112db553 LT |
375 | FILE *xfdopen(int fd, const char *mode) |
376 | { | |
377 | FILE *stream = fdopen(fd, mode); | |
378 | if (stream == NULL) | |
d824cbba | 379 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
380 | return stream; |
381 | } | |
382 | ||
79d7582e JS |
383 | FILE *fopen_for_writing(const char *path) |
384 | { | |
385 | FILE *ret = fopen(path, "w"); | |
386 | ||
387 | if (!ret && errno == EPERM) { | |
388 | if (!unlink(path)) | |
389 | ret = fopen(path, "w"); | |
390 | else | |
391 | errno = EPERM; | |
392 | } | |
393 | return ret; | |
394 | } | |
395 | ||
382fb07f NTND |
396 | static void warn_on_inaccessible(const char *path) |
397 | { | |
398 | warning_errno(_("unable to access '%s'"), path); | |
399 | } | |
400 | ||
11dc1fcb NTND |
401 | int warn_on_fopen_errors(const char *path) |
402 | { | |
403 | if (errno != ENOENT && errno != ENOTDIR) { | |
404 | warn_on_inaccessible(path); | |
405 | return -1; | |
406 | } | |
407 | ||
408 | return 0; | |
409 | } | |
410 | ||
e9d983f1 NTND |
411 | FILE *fopen_or_warn(const char *path, const char *mode) |
412 | { | |
413 | FILE *fp = fopen(path, mode); | |
414 | ||
415 | if (fp) | |
416 | return fp; | |
417 | ||
418 | warn_on_fopen_errors(path); | |
419 | return NULL; | |
420 | } | |
421 | ||
eb78e23f | 422 | int xmkstemp(char *filename_template) |
112db553 LT |
423 | { |
424 | int fd; | |
6cf6bb3e | 425 | char origtemplate[PATH_MAX]; |
eb78e23f | 426 | strlcpy(origtemplate, filename_template, sizeof(origtemplate)); |
112db553 | 427 | |
eb78e23f | 428 | fd = mkstemp(filename_template); |
6cf6bb3e AE |
429 | if (fd < 0) { |
430 | int saved_errno = errno; | |
431 | const char *nonrelative_template; | |
432 | ||
eb78e23f BW |
433 | if (strlen(filename_template) != strlen(origtemplate)) |
434 | filename_template = origtemplate; | |
6cf6bb3e | 435 | |
eb78e23f | 436 | nonrelative_template = absolute_path(filename_template); |
6cf6bb3e AE |
437 | errno = saved_errno; |
438 | die_errno("Unable to create temporary file '%s'", | |
439 | nonrelative_template); | |
440 | } | |
112db553 LT |
441 | return fd; |
442 | } | |
39c68542 | 443 | |
33f23936 JN |
444 | /* Adapted from libiberty's mkstemp.c. */ |
445 | ||
446 | #undef TMP_MAX | |
447 | #define TMP_MAX 16384 | |
448 | ||
449 | int git_mkstemps_mode(char *pattern, int suffix_len, int mode) | |
450 | { | |
451 | static const char letters[] = | |
452 | "abcdefghijklmnopqrstuvwxyz" | |
453 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
454 | "0123456789"; | |
53d687bf JK |
455 | static const int num_letters = ARRAY_SIZE(letters) - 1; |
456 | static const char x_pattern[] = "XXXXXX"; | |
457 | static const int num_x = ARRAY_SIZE(x_pattern) - 1; | |
33f23936 JN |
458 | uint64_t value; |
459 | struct timeval tv; | |
eb78e23f | 460 | char *filename_template; |
33f23936 JN |
461 | size_t len; |
462 | int fd, count; | |
463 | ||
464 | len = strlen(pattern); | |
465 | ||
53d687bf | 466 | if (len < num_x + suffix_len) { |
33f23936 JN |
467 | errno = EINVAL; |
468 | return -1; | |
469 | } | |
470 | ||
53d687bf | 471 | if (strncmp(&pattern[len - num_x - suffix_len], x_pattern, num_x)) { |
33f23936 JN |
472 | errno = EINVAL; |
473 | return -1; | |
474 | } | |
475 | ||
476 | /* | |
477 | * Replace pattern's XXXXXX characters with randomness. | |
478 | * Try TMP_MAX different filenames. | |
479 | */ | |
480 | gettimeofday(&tv, NULL); | |
729a9b55 | 481 | value = ((uint64_t)tv.tv_usec << 16) ^ tv.tv_sec ^ getpid(); |
53d687bf | 482 | filename_template = &pattern[len - num_x - suffix_len]; |
33f23936 JN |
483 | for (count = 0; count < TMP_MAX; ++count) { |
484 | uint64_t v = value; | |
54a80a9a | 485 | int i; |
33f23936 | 486 | /* Fill in the random bits. */ |
53d687bf | 487 | for (i = 0; i < num_x; i++) { |
54a80a9a AH |
488 | filename_template[i] = letters[v % num_letters]; |
489 | v /= num_letters; | |
490 | } | |
33f23936 JN |
491 | |
492 | fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode); | |
a2cb86c1 | 493 | if (fd >= 0) |
33f23936 JN |
494 | return fd; |
495 | /* | |
496 | * Fatal error (EPERM, ENOSPC etc). | |
497 | * It doesn't make sense to loop. | |
498 | */ | |
499 | if (errno != EEXIST) | |
500 | break; | |
501 | /* | |
502 | * This is a random value. It is only necessary that | |
503 | * the next TMP_MAX values generated by adding 7777 to | |
504 | * VALUE are different with (module 2^32). | |
505 | */ | |
506 | value += 7777; | |
507 | } | |
508 | /* We return the null string if we can't find a unique file name. */ | |
509 | pattern[0] = '\0'; | |
510 | return -1; | |
511 | } | |
512 | ||
513 | int git_mkstemp_mode(char *pattern, int mode) | |
514 | { | |
515 | /* mkstemp is just mkstemps with no suffix */ | |
516 | return git_mkstemps_mode(pattern, 0, mode); | |
517 | } | |
518 | ||
eb78e23f | 519 | int xmkstemp_mode(char *filename_template, int mode) |
b862b61c MM |
520 | { |
521 | int fd; | |
6cf6bb3e | 522 | char origtemplate[PATH_MAX]; |
eb78e23f | 523 | strlcpy(origtemplate, filename_template, sizeof(origtemplate)); |
b862b61c | 524 | |
eb78e23f | 525 | fd = git_mkstemp_mode(filename_template, mode); |
6cf6bb3e AE |
526 | if (fd < 0) { |
527 | int saved_errno = errno; | |
528 | const char *nonrelative_template; | |
529 | ||
eb78e23f BW |
530 | if (!filename_template[0]) |
531 | filename_template = origtemplate; | |
6cf6bb3e | 532 | |
eb78e23f | 533 | nonrelative_template = absolute_path(filename_template); |
6cf6bb3e AE |
534 | errno = saved_errno; |
535 | die_errno("Unable to create temporary file '%s'", | |
536 | nonrelative_template); | |
537 | } | |
b862b61c MM |
538 | return fd; |
539 | } | |
540 | ||
10e13ec8 | 541 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 542 | { |
1054af7d RS |
543 | int err; |
544 | if (!rc || errno == ENOENT) | |
545 | return 0; | |
546 | err = errno; | |
0a288d1e | 547 | warning_errno("unable to %s '%s'", op, file); |
1054af7d | 548 | errno = err; |
fc71db39 AR |
549 | return rc; |
550 | } | |
551 | ||
9ccc0c08 RS |
552 | int unlink_or_msg(const char *file, struct strbuf *err) |
553 | { | |
554 | int rc = unlink(file); | |
555 | ||
556 | assert(err); | |
557 | ||
558 | if (!rc || errno == ENOENT) | |
559 | return 0; | |
560 | ||
0a288d1e | 561 | strbuf_addf(err, "unable to unlink '%s': %s", |
9ccc0c08 RS |
562 | file, strerror(errno)); |
563 | return -1; | |
564 | } | |
565 | ||
10e13ec8 PC |
566 | int unlink_or_warn(const char *file) |
567 | { | |
568 | return warn_if_unremovable("unlink", file, unlink(file)); | |
569 | } | |
d1723296 PC |
570 | |
571 | int rmdir_or_warn(const char *file) | |
572 | { | |
573 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
574 | } | |
80d706af PC |
575 | |
576 | int remove_or_warn(unsigned int mode, const char *file) | |
577 | { | |
578 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
579 | } | |
2f705875 | 580 | |
4698c8fe JN |
581 | static int access_error_is_ok(int err, unsigned flag) |
582 | { | |
c7054209 JH |
583 | return (is_missing_file_error(err) || |
584 | ((flag & ACCESS_EACCES_OK) && err == EACCES)); | |
4698c8fe JN |
585 | } |
586 | ||
587 | int access_or_warn(const char *path, int mode, unsigned flag) | |
ba8bd830 JK |
588 | { |
589 | int ret = access(path, mode); | |
4698c8fe | 590 | if (ret && !access_error_is_ok(errno, flag)) |
55b38a48 | 591 | warn_on_inaccessible(path); |
ba8bd830 JK |
592 | return ret; |
593 | } | |
594 | ||
4698c8fe | 595 | int access_or_die(const char *path, int mode, unsigned flag) |
96b9e0e3 JN |
596 | { |
597 | int ret = access(path, mode); | |
4698c8fe | 598 | if (ret && !access_error_is_ok(errno, flag)) |
96b9e0e3 JN |
599 | die_errno(_("unable to access '%s'"), path); |
600 | return ret; | |
601 | } | |
602 | ||
aa14e980 RS |
603 | char *xgetcwd(void) |
604 | { | |
605 | struct strbuf sb = STRBUF_INIT; | |
606 | if (strbuf_getcwd(&sb)) | |
607 | die_errno(_("unable to get current working directory")); | |
608 | return strbuf_detach(&sb, NULL); | |
609 | } | |
316e53e6 | 610 | |
7b03c89e JK |
611 | int xsnprintf(char *dst, size_t max, const char *fmt, ...) |
612 | { | |
613 | va_list ap; | |
614 | int len; | |
615 | ||
616 | va_start(ap, fmt); | |
617 | len = vsnprintf(dst, max, fmt, ap); | |
618 | va_end(ap); | |
619 | ||
620 | if (len < 0) | |
033abf97 | 621 | BUG("your snprintf is broken"); |
7b03c89e | 622 | if (len >= max) |
033abf97 | 623 | BUG("attempt to snprintf into too-small buffer"); |
7b03c89e JK |
624 | return len; |
625 | } | |
626 | ||
52563d7e | 627 | void write_file_buf(const char *path, const char *buf, size_t len) |
316e53e6 | 628 | { |
52563d7e | 629 | int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
06f46f23 | 630 | if (write_in_full(fd, buf, len) < 0) |
0a288d1e | 631 | die_errno(_("could not write to '%s'"), path); |
52563d7e | 632 | if (close(fd)) |
0a288d1e | 633 | die_errno(_("could not close '%s'"), path); |
316e53e6 | 634 | } |
2024d317 | 635 | |
ef22318c | 636 | void write_file(const char *path, const char *fmt, ...) |
12d6ce1d | 637 | { |
12d6ce1d | 638 | va_list params; |
316e53e6 | 639 | struct strbuf sb = STRBUF_INIT; |
12d6ce1d JH |
640 | |
641 | va_start(params, fmt); | |
ef22318c | 642 | strbuf_vaddf(&sb, fmt, params); |
12d6ce1d | 643 | va_end(params); |
12d6ce1d | 644 | |
ef22318c | 645 | strbuf_complete_line(&sb); |
12d6ce1d | 646 | |
52563d7e | 647 | write_file_buf(path, sb.buf, sb.len); |
ef22318c | 648 | strbuf_release(&sb); |
12d6ce1d JH |
649 | } |
650 | ||
2024d317 JS |
651 | void sleep_millisec(int millisec) |
652 | { | |
653 | poll(NULL, 0, millisec); | |
654 | } | |
5781a9a2 DT |
655 | |
656 | int xgethostname(char *buf, size_t len) | |
657 | { | |
658 | /* | |
659 | * If the full hostname doesn't fit in buf, POSIX does not | |
660 | * specify whether the buffer will be null-terminated, so to | |
661 | * be safe, do it ourselves. | |
662 | */ | |
663 | int ret = gethostname(buf, len); | |
664 | if (!ret) | |
665 | buf[len - 1] = 0; | |
666 | return ret; | |
667 | } | |
e3b1e3bd PB |
668 | |
669 | int is_empty_or_missing_file(const char *filename) | |
670 | { | |
671 | struct stat st; | |
672 | ||
673 | if (stat(filename, &st) < 0) { | |
674 | if (errno == ENOENT) | |
675 | return 1; | |
676 | die_errno(_("could not stat %s"), filename); | |
677 | } | |
678 | ||
679 | return !st.st_size; | |
680 | } | |
00611d84 JK |
681 | |
682 | int open_nofollow(const char *path, int flags) | |
683 | { | |
684 | #ifdef O_NOFOLLOW | |
685 | return open(path, flags | O_NOFOLLOW); | |
686 | #else | |
687 | struct stat st; | |
688 | if (lstat(path, &st) < 0) | |
689 | return -1; | |
690 | if (S_ISLNK(st.st_mode)) { | |
691 | errno = ELOOP; | |
692 | return -1; | |
693 | } | |
694 | return open(path, flags); | |
695 | #endif | |
696 | } |