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Commit | Line | Data |
---|---|---|
112db553 LT |
1 | /* |
2 | * Various trivial helper wrappers around standard functions | |
3 | */ | |
4 | #include "cache.h" | |
5 | ||
e0500293 | 6 | static void do_nothing(size_t size) |
a9a74636 | 7 | { |
a9a74636 NP |
8 | } |
9 | ||
e0500293 | 10 | static void (*try_to_free_routine)(size_t size) = do_nothing; |
a9a74636 | 11 | |
f8bb1d94 | 12 | static int memory_limit_check(size_t size, int gentle) |
d41489a6 | 13 | { |
9927d962 SP |
14 | static size_t limit = 0; |
15 | if (!limit) { | |
16 | limit = git_env_ulong("GIT_ALLOC_LIMIT", 0); | |
17 | if (!limit) | |
18 | limit = SIZE_MAX; | |
d41489a6 | 19 | } |
f0d89001 | 20 | if (size > limit) { |
f8bb1d94 | 21 | if (gentle) { |
f0d89001 JH |
22 | error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
23 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
24 | return -1; |
25 | } else | |
f0d89001 JH |
26 | die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX, |
27 | (uintmax_t)size, (uintmax_t)limit); | |
f8bb1d94 NTND |
28 | } |
29 | return 0; | |
d41489a6 NTND |
30 | } |
31 | ||
851c34b0 | 32 | try_to_free_t set_try_to_free_routine(try_to_free_t routine) |
a9a74636 | 33 | { |
851c34b0 | 34 | try_to_free_t old = try_to_free_routine; |
00b0d7f7 JH |
35 | if (!routine) |
36 | routine = do_nothing; | |
851c34b0 JS |
37 | try_to_free_routine = routine; |
38 | return old; | |
a9a74636 NP |
39 | } |
40 | ||
112db553 LT |
41 | char *xstrdup(const char *str) |
42 | { | |
43 | char *ret = strdup(str); | |
44 | if (!ret) { | |
a9a74636 | 45 | try_to_free_routine(strlen(str) + 1); |
112db553 LT |
46 | ret = strdup(str); |
47 | if (!ret) | |
48 | die("Out of memory, strdup failed"); | |
49 | } | |
50 | return ret; | |
51 | } | |
52 | ||
f8bb1d94 | 53 | static void *do_xmalloc(size_t size, int gentle) |
112db553 | 54 | { |
d41489a6 NTND |
55 | void *ret; |
56 | ||
f8bb1d94 NTND |
57 | if (memory_limit_check(size, gentle)) |
58 | return NULL; | |
d41489a6 | 59 | ret = malloc(size); |
112db553 LT |
60 | if (!ret && !size) |
61 | ret = malloc(1); | |
62 | if (!ret) { | |
a9a74636 | 63 | try_to_free_routine(size); |
112db553 LT |
64 | ret = malloc(size); |
65 | if (!ret && !size) | |
66 | ret = malloc(1); | |
f8bb1d94 NTND |
67 | if (!ret) { |
68 | if (!gentle) | |
69 | die("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
70 | (unsigned long)size); | |
71 | else { | |
72 | error("Out of memory, malloc failed (tried to allocate %lu bytes)", | |
73 | (unsigned long)size); | |
74 | return NULL; | |
75 | } | |
76 | } | |
112db553 LT |
77 | } |
78 | #ifdef XMALLOC_POISON | |
79 | memset(ret, 0xA5, size); | |
80 | #endif | |
81 | return ret; | |
82 | } | |
83 | ||
f8bb1d94 NTND |
84 | void *xmalloc(size_t size) |
85 | { | |
86 | return do_xmalloc(size, 0); | |
87 | } | |
88 | ||
89 | static void *do_xmallocz(size_t size, int gentle) | |
5bf9219d IL |
90 | { |
91 | void *ret; | |
f8bb1d94 NTND |
92 | if (unsigned_add_overflows(size, 1)) { |
93 | if (gentle) { | |
94 | error("Data too large to fit into virtual memory space."); | |
95 | return NULL; | |
96 | } else | |
97 | die("Data too large to fit into virtual memory space."); | |
98 | } | |
99 | ret = do_xmalloc(size + 1, gentle); | |
100 | if (ret) | |
101 | ((char*)ret)[size] = 0; | |
5bf9219d IL |
102 | return ret; |
103 | } | |
104 | ||
f8bb1d94 NTND |
105 | void *xmallocz(size_t size) |
106 | { | |
107 | return do_xmallocz(size, 0); | |
108 | } | |
109 | ||
110 | void *xmallocz_gently(size_t size) | |
111 | { | |
112 | return do_xmallocz(size, 1); | |
113 | } | |
114 | ||
112db553 LT |
115 | /* |
116 | * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of | |
117 | * "data" to the allocated memory, zero terminates the allocated memory, | |
118 | * and returns a pointer to the allocated memory. If the allocation fails, | |
119 | * the program dies. | |
120 | */ | |
121 | void *xmemdupz(const void *data, size_t len) | |
122 | { | |
5bf9219d | 123 | return memcpy(xmallocz(len), data, len); |
112db553 LT |
124 | } |
125 | ||
126 | char *xstrndup(const char *str, size_t len) | |
127 | { | |
128 | char *p = memchr(str, '\0', len); | |
129 | return xmemdupz(str, p ? p - str : len); | |
130 | } | |
131 | ||
132 | void *xrealloc(void *ptr, size_t size) | |
133 | { | |
d41489a6 NTND |
134 | void *ret; |
135 | ||
f8bb1d94 | 136 | memory_limit_check(size, 0); |
d41489a6 | 137 | ret = realloc(ptr, size); |
112db553 LT |
138 | if (!ret && !size) |
139 | ret = realloc(ptr, 1); | |
140 | if (!ret) { | |
a9a74636 | 141 | try_to_free_routine(size); |
112db553 LT |
142 | ret = realloc(ptr, size); |
143 | if (!ret && !size) | |
144 | ret = realloc(ptr, 1); | |
145 | if (!ret) | |
146 | die("Out of memory, realloc failed"); | |
147 | } | |
148 | return ret; | |
149 | } | |
150 | ||
151 | void *xcalloc(size_t nmemb, size_t size) | |
152 | { | |
d41489a6 NTND |
153 | void *ret; |
154 | ||
f8bb1d94 | 155 | memory_limit_check(size * nmemb, 0); |
d41489a6 | 156 | ret = calloc(nmemb, size); |
112db553 LT |
157 | if (!ret && (!nmemb || !size)) |
158 | ret = calloc(1, 1); | |
159 | if (!ret) { | |
a9a74636 | 160 | try_to_free_routine(nmemb * size); |
112db553 LT |
161 | ret = calloc(nmemb, size); |
162 | if (!ret && (!nmemb || !size)) | |
163 | ret = calloc(1, 1); | |
164 | if (!ret) | |
165 | die("Out of memory, calloc failed"); | |
166 | } | |
167 | return ret; | |
168 | } | |
169 | ||
0b6806b9 SP |
170 | /* |
171 | * Limit size of IO chunks, because huge chunks only cause pain. OS X | |
172 | * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in | |
382d20e3 | 173 | * the absence of bugs, large chunks can result in bad latencies when |
0b6806b9 | 174 | * you decide to kill the process. |
a983e6ac JH |
175 | * |
176 | * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX | |
177 | * that is smaller than that, clip it to SSIZE_MAX, as a call to | |
178 | * read(2) or write(2) larger than that is allowed to fail. As the last | |
179 | * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value" | |
180 | * to override this, if the definition of SSIZE_MAX given by the platform | |
181 | * is broken. | |
0b6806b9 | 182 | */ |
a983e6ac JH |
183 | #ifndef MAX_IO_SIZE |
184 | # define MAX_IO_SIZE_DEFAULT (8*1024*1024) | |
185 | # if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT) | |
186 | # define MAX_IO_SIZE SSIZE_MAX | |
187 | # else | |
188 | # define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT | |
189 | # endif | |
190 | #endif | |
0b6806b9 | 191 | |
3ff53df7 PT |
192 | /** |
193 | * xopen() is the same as open(), but it die()s if the open() fails. | |
194 | */ | |
195 | int xopen(const char *path, int oflag, ...) | |
196 | { | |
197 | mode_t mode = 0; | |
198 | va_list ap; | |
199 | ||
200 | /* | |
201 | * va_arg() will have undefined behavior if the specified type is not | |
202 | * compatible with the argument type. Since integers are promoted to | |
203 | * ints, we fetch the next argument as an int, and then cast it to a | |
204 | * mode_t to avoid undefined behavior. | |
205 | */ | |
206 | va_start(ap, oflag); | |
207 | if (oflag & O_CREAT) | |
208 | mode = va_arg(ap, int); | |
209 | va_end(ap); | |
210 | ||
211 | for (;;) { | |
212 | int fd = open(path, oflag, mode); | |
213 | if (fd >= 0) | |
214 | return fd; | |
215 | if (errno == EINTR) | |
216 | continue; | |
217 | ||
218 | if ((oflag & O_RDWR) == O_RDWR) | |
219 | die_errno(_("could not open '%s' for reading and writing"), path); | |
220 | else if ((oflag & O_WRONLY) == O_WRONLY) | |
221 | die_errno(_("could not open '%s' for writing"), path); | |
222 | else | |
223 | die_errno(_("could not open '%s' for reading"), path); | |
224 | } | |
225 | } | |
226 | ||
112db553 LT |
227 | /* |
228 | * xread() is the same a read(), but it automatically restarts read() | |
229 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
230 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
231 | */ | |
232 | ssize_t xread(int fd, void *buf, size_t len) | |
233 | { | |
234 | ssize_t nr; | |
0b6806b9 SP |
235 | if (len > MAX_IO_SIZE) |
236 | len = MAX_IO_SIZE; | |
112db553 LT |
237 | while (1) { |
238 | nr = read(fd, buf, len); | |
239 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
240 | continue; | |
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 SP |
253 | if (len > MAX_IO_SIZE) |
254 | len = MAX_IO_SIZE; | |
112db553 LT |
255 | while (1) { |
256 | nr = write(fd, buf, len); | |
257 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
9aa91af0 YM |
258 | continue; |
259 | return nr; | |
260 | } | |
261 | } | |
262 | ||
263 | /* | |
264 | * xpread() is the same as pread(), but it automatically restarts pread() | |
265 | * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES | |
266 | * NOT GUARANTEE that "len" bytes is read even if the data is available. | |
267 | */ | |
268 | ssize_t xpread(int fd, void *buf, size_t len, off_t offset) | |
269 | { | |
270 | ssize_t nr; | |
271 | if (len > MAX_IO_SIZE) | |
272 | len = MAX_IO_SIZE; | |
273 | while (1) { | |
274 | nr = pread(fd, buf, len, offset); | |
275 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
112db553 LT |
276 | continue; |
277 | return nr; | |
278 | } | |
279 | } | |
280 | ||
559e840b JH |
281 | ssize_t read_in_full(int fd, void *buf, size_t count) |
282 | { | |
283 | char *p = buf; | |
284 | ssize_t total = 0; | |
285 | ||
286 | while (count > 0) { | |
287 | ssize_t loaded = xread(fd, p, count); | |
56d7c27a JK |
288 | if (loaded < 0) |
289 | return -1; | |
290 | if (loaded == 0) | |
291 | return total; | |
559e840b JH |
292 | count -= loaded; |
293 | p += loaded; | |
294 | total += loaded; | |
295 | } | |
296 | ||
297 | return total; | |
298 | } | |
299 | ||
300 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
301 | { | |
302 | const char *p = buf; | |
303 | ssize_t total = 0; | |
304 | ||
305 | while (count > 0) { | |
306 | ssize_t written = xwrite(fd, p, count); | |
307 | if (written < 0) | |
308 | return -1; | |
309 | if (!written) { | |
310 | errno = ENOSPC; | |
311 | return -1; | |
312 | } | |
313 | count -= written; | |
314 | p += written; | |
315 | total += written; | |
316 | } | |
317 | ||
318 | return total; | |
319 | } | |
320 | ||
426ddeea YM |
321 | ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset) |
322 | { | |
323 | char *p = buf; | |
324 | ssize_t total = 0; | |
325 | ||
326 | while (count > 0) { | |
327 | ssize_t loaded = xpread(fd, p, count, offset); | |
328 | if (loaded < 0) | |
329 | return -1; | |
330 | if (loaded == 0) | |
331 | return total; | |
332 | count -= loaded; | |
333 | p += loaded; | |
334 | total += loaded; | |
335 | offset += loaded; | |
336 | } | |
337 | ||
338 | return total; | |
339 | } | |
340 | ||
112db553 LT |
341 | int xdup(int fd) |
342 | { | |
343 | int ret = dup(fd); | |
344 | if (ret < 0) | |
d824cbba | 345 | die_errno("dup failed"); |
112db553 LT |
346 | return ret; |
347 | } | |
348 | ||
260eec29 PT |
349 | /** |
350 | * xfopen() is the same as fopen(), but it die()s if the fopen() fails. | |
351 | */ | |
352 | FILE *xfopen(const char *path, const char *mode) | |
353 | { | |
354 | for (;;) { | |
355 | FILE *fp = fopen(path, mode); | |
356 | if (fp) | |
357 | return fp; | |
358 | if (errno == EINTR) | |
359 | continue; | |
360 | ||
361 | if (*mode && mode[1] == '+') | |
362 | die_errno(_("could not open '%s' for reading and writing"), path); | |
363 | else if (*mode == 'w' || *mode == 'a') | |
364 | die_errno(_("could not open '%s' for writing"), path); | |
365 | else | |
366 | die_errno(_("could not open '%s' for reading"), path); | |
367 | } | |
368 | } | |
369 | ||
112db553 LT |
370 | FILE *xfdopen(int fd, const char *mode) |
371 | { | |
372 | FILE *stream = fdopen(fd, mode); | |
373 | if (stream == NULL) | |
d824cbba | 374 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
375 | return stream; |
376 | } | |
377 | ||
378 | int xmkstemp(char *template) | |
379 | { | |
380 | int fd; | |
6cf6bb3e AE |
381 | char origtemplate[PATH_MAX]; |
382 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
112db553 LT |
383 | |
384 | fd = mkstemp(template); | |
6cf6bb3e AE |
385 | if (fd < 0) { |
386 | int saved_errno = errno; | |
387 | const char *nonrelative_template; | |
388 | ||
f7be59b4 | 389 | if (strlen(template) != strlen(origtemplate)) |
6cf6bb3e AE |
390 | template = origtemplate; |
391 | ||
e2a57aac | 392 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
393 | errno = saved_errno; |
394 | die_errno("Unable to create temporary file '%s'", | |
395 | nonrelative_template); | |
396 | } | |
112db553 LT |
397 | return fd; |
398 | } | |
39c68542 | 399 | |
33f23936 JN |
400 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ |
401 | int git_mkstemp(char *path, size_t len, const char *template) | |
402 | { | |
403 | const char *tmp; | |
404 | size_t n; | |
405 | ||
406 | tmp = getenv("TMPDIR"); | |
407 | if (!tmp) | |
408 | tmp = "/tmp"; | |
409 | n = snprintf(path, len, "%s/%s", tmp, template); | |
410 | if (len <= n) { | |
411 | errno = ENAMETOOLONG; | |
412 | return -1; | |
413 | } | |
414 | return mkstemp(path); | |
415 | } | |
416 | ||
417 | /* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */ | |
418 | int git_mkstemps(char *path, size_t len, const char *template, int suffix_len) | |
419 | { | |
420 | const char *tmp; | |
421 | size_t n; | |
422 | ||
423 | tmp = getenv("TMPDIR"); | |
424 | if (!tmp) | |
425 | tmp = "/tmp"; | |
426 | n = snprintf(path, len, "%s/%s", tmp, template); | |
427 | if (len <= n) { | |
428 | errno = ENAMETOOLONG; | |
429 | return -1; | |
430 | } | |
431 | return mkstemps(path, suffix_len); | |
432 | } | |
433 | ||
434 | /* Adapted from libiberty's mkstemp.c. */ | |
435 | ||
436 | #undef TMP_MAX | |
437 | #define TMP_MAX 16384 | |
438 | ||
439 | int git_mkstemps_mode(char *pattern, int suffix_len, int mode) | |
440 | { | |
441 | static const char letters[] = | |
442 | "abcdefghijklmnopqrstuvwxyz" | |
443 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
444 | "0123456789"; | |
445 | static const int num_letters = 62; | |
446 | uint64_t value; | |
447 | struct timeval tv; | |
448 | char *template; | |
449 | size_t len; | |
450 | int fd, count; | |
451 | ||
452 | len = strlen(pattern); | |
453 | ||
454 | if (len < 6 + suffix_len) { | |
455 | errno = EINVAL; | |
456 | return -1; | |
457 | } | |
458 | ||
459 | if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) { | |
460 | errno = EINVAL; | |
461 | return -1; | |
462 | } | |
463 | ||
464 | /* | |
465 | * Replace pattern's XXXXXX characters with randomness. | |
466 | * Try TMP_MAX different filenames. | |
467 | */ | |
468 | gettimeofday(&tv, NULL); | |
469 | value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid(); | |
470 | template = &pattern[len - 6 - suffix_len]; | |
471 | for (count = 0; count < TMP_MAX; ++count) { | |
472 | uint64_t v = value; | |
473 | /* Fill in the random bits. */ | |
474 | template[0] = letters[v % num_letters]; v /= num_letters; | |
475 | template[1] = letters[v % num_letters]; v /= num_letters; | |
476 | template[2] = letters[v % num_letters]; v /= num_letters; | |
477 | template[3] = letters[v % num_letters]; v /= num_letters; | |
478 | template[4] = letters[v % num_letters]; v /= num_letters; | |
479 | template[5] = letters[v % num_letters]; v /= num_letters; | |
480 | ||
481 | fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode); | |
a2cb86c1 | 482 | if (fd >= 0) |
33f23936 JN |
483 | return fd; |
484 | /* | |
485 | * Fatal error (EPERM, ENOSPC etc). | |
486 | * It doesn't make sense to loop. | |
487 | */ | |
488 | if (errno != EEXIST) | |
489 | break; | |
490 | /* | |
491 | * This is a random value. It is only necessary that | |
492 | * the next TMP_MAX values generated by adding 7777 to | |
493 | * VALUE are different with (module 2^32). | |
494 | */ | |
495 | value += 7777; | |
496 | } | |
497 | /* We return the null string if we can't find a unique file name. */ | |
498 | pattern[0] = '\0'; | |
499 | return -1; | |
500 | } | |
501 | ||
502 | int git_mkstemp_mode(char *pattern, int mode) | |
503 | { | |
504 | /* mkstemp is just mkstemps with no suffix */ | |
505 | return git_mkstemps_mode(pattern, 0, mode); | |
506 | } | |
507 | ||
ec145c9c | 508 | #ifdef NO_MKSTEMPS |
33f23936 JN |
509 | int gitmkstemps(char *pattern, int suffix_len) |
510 | { | |
511 | return git_mkstemps_mode(pattern, suffix_len, 0600); | |
512 | } | |
ec145c9c | 513 | #endif |
33f23936 | 514 | |
b862b61c MM |
515 | int xmkstemp_mode(char *template, int mode) |
516 | { | |
517 | int fd; | |
6cf6bb3e AE |
518 | char origtemplate[PATH_MAX]; |
519 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
b862b61c MM |
520 | |
521 | fd = git_mkstemp_mode(template, mode); | |
6cf6bb3e AE |
522 | if (fd < 0) { |
523 | int saved_errno = errno; | |
524 | const char *nonrelative_template; | |
525 | ||
526 | if (!template[0]) | |
527 | template = origtemplate; | |
528 | ||
e2a57aac | 529 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
530 | errno = saved_errno; |
531 | die_errno("Unable to create temporary file '%s'", | |
532 | nonrelative_template); | |
533 | } | |
b862b61c MM |
534 | return fd; |
535 | } | |
536 | ||
10e13ec8 | 537 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 538 | { |
1054af7d RS |
539 | int err; |
540 | if (!rc || errno == ENOENT) | |
541 | return 0; | |
542 | err = errno; | |
543 | warning("unable to %s %s: %s", op, file, strerror(errno)); | |
544 | errno = err; | |
fc71db39 AR |
545 | return rc; |
546 | } | |
547 | ||
9ccc0c08 RS |
548 | int unlink_or_msg(const char *file, struct strbuf *err) |
549 | { | |
550 | int rc = unlink(file); | |
551 | ||
552 | assert(err); | |
553 | ||
554 | if (!rc || errno == ENOENT) | |
555 | return 0; | |
556 | ||
557 | strbuf_addf(err, "unable to unlink %s: %s", | |
558 | file, strerror(errno)); | |
559 | return -1; | |
560 | } | |
561 | ||
10e13ec8 PC |
562 | int unlink_or_warn(const char *file) |
563 | { | |
564 | return warn_if_unremovable("unlink", file, unlink(file)); | |
565 | } | |
d1723296 PC |
566 | |
567 | int rmdir_or_warn(const char *file) | |
568 | { | |
569 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
570 | } | |
80d706af PC |
571 | |
572 | int remove_or_warn(unsigned int mode, const char *file) | |
573 | { | |
574 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
575 | } | |
2f705875 | 576 | |
55b38a48 JH |
577 | void warn_on_inaccessible(const char *path) |
578 | { | |
579 | warning(_("unable to access '%s': %s"), path, strerror(errno)); | |
580 | } | |
581 | ||
4698c8fe JN |
582 | static int access_error_is_ok(int err, unsigned flag) |
583 | { | |
584 | return err == ENOENT || err == ENOTDIR || | |
585 | ((flag & ACCESS_EACCES_OK) && err == EACCES); | |
586 | } | |
587 | ||
588 | int access_or_warn(const char *path, int mode, unsigned flag) | |
ba8bd830 JK |
589 | { |
590 | int ret = access(path, mode); | |
4698c8fe | 591 | if (ret && !access_error_is_ok(errno, flag)) |
55b38a48 | 592 | warn_on_inaccessible(path); |
ba8bd830 JK |
593 | return ret; |
594 | } | |
595 | ||
4698c8fe | 596 | int access_or_die(const char *path, int mode, unsigned flag) |
96b9e0e3 JN |
597 | { |
598 | int ret = access(path, mode); | |
4698c8fe | 599 | if (ret && !access_error_is_ok(errno, flag)) |
96b9e0e3 JN |
600 | die_errno(_("unable to access '%s'"), path); |
601 | return ret; | |
602 | } | |
603 | ||
2f705875 JK |
604 | struct passwd *xgetpwuid_self(void) |
605 | { | |
606 | struct passwd *pw; | |
607 | ||
608 | errno = 0; | |
609 | pw = getpwuid(getuid()); | |
610 | if (!pw) | |
611 | die(_("unable to look up current user in the passwd file: %s"), | |
612 | errno ? strerror(errno) : _("no such user")); | |
613 | return pw; | |
614 | } | |
aa14e980 RS |
615 | |
616 | char *xgetcwd(void) | |
617 | { | |
618 | struct strbuf sb = STRBUF_INIT; | |
619 | if (strbuf_getcwd(&sb)) | |
620 | die_errno(_("unable to get current working directory")); | |
621 | return strbuf_detach(&sb, NULL); | |
622 | } | |
316e53e6 | 623 | |
7b03c89e JK |
624 | int xsnprintf(char *dst, size_t max, const char *fmt, ...) |
625 | { | |
626 | va_list ap; | |
627 | int len; | |
628 | ||
629 | va_start(ap, fmt); | |
630 | len = vsnprintf(dst, max, fmt, ap); | |
631 | va_end(ap); | |
632 | ||
633 | if (len < 0) | |
634 | die("BUG: your snprintf is broken"); | |
635 | if (len >= max) | |
636 | die("BUG: attempt to snprintf into too-small buffer"); | |
637 | return len; | |
638 | } | |
639 | ||
12d6ce1d JH |
640 | static int write_file_v(const char *path, int fatal, |
641 | const char *fmt, va_list params) | |
316e53e6 NTND |
642 | { |
643 | struct strbuf sb = STRBUF_INIT; | |
316e53e6 NTND |
644 | int fd = open(path, O_RDWR | O_CREAT | O_TRUNC, 0666); |
645 | if (fd < 0) { | |
646 | if (fatal) | |
647 | die_errno(_("could not open %s for writing"), path); | |
648 | return -1; | |
649 | } | |
316e53e6 | 650 | strbuf_vaddf(&sb, fmt, params); |
e7ffa38c | 651 | strbuf_complete_line(&sb); |
316e53e6 NTND |
652 | if (write_in_full(fd, sb.buf, sb.len) != sb.len) { |
653 | int err = errno; | |
654 | close(fd); | |
655 | strbuf_release(&sb); | |
656 | errno = err; | |
657 | if (fatal) | |
658 | die_errno(_("could not write to %s"), path); | |
659 | return -1; | |
660 | } | |
661 | strbuf_release(&sb); | |
662 | if (close(fd)) { | |
663 | if (fatal) | |
664 | die_errno(_("could not close %s"), path); | |
665 | return -1; | |
666 | } | |
667 | return 0; | |
668 | } | |
2024d317 | 669 | |
12d6ce1d JH |
670 | int write_file(const char *path, const char *fmt, ...) |
671 | { | |
672 | int status; | |
673 | va_list params; | |
674 | ||
675 | va_start(params, fmt); | |
676 | status = write_file_v(path, 1, fmt, params); | |
677 | va_end(params); | |
678 | return status; | |
679 | } | |
680 | ||
681 | int write_file_gently(const char *path, const char *fmt, ...) | |
682 | { | |
683 | int status; | |
684 | va_list params; | |
685 | ||
686 | va_start(params, fmt); | |
687 | status = write_file_v(path, 0, fmt, params); | |
688 | va_end(params); | |
689 | return status; | |
690 | } | |
691 | ||
2024d317 JS |
692 | void sleep_millisec(int millisec) |
693 | { | |
694 | poll(NULL, 0, millisec); | |
695 | } |