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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 | ||
e7792a74 JK |
155 | if (unsigned_mult_overflows(nmemb, size)) |
156 | die("data too large to fit into virtual memory space"); | |
157 | ||
f8bb1d94 | 158 | memory_limit_check(size * nmemb, 0); |
d41489a6 | 159 | ret = calloc(nmemb, size); |
112db553 LT |
160 | if (!ret && (!nmemb || !size)) |
161 | ret = calloc(1, 1); | |
162 | if (!ret) { | |
a9a74636 | 163 | try_to_free_routine(nmemb * size); |
112db553 LT |
164 | ret = calloc(nmemb, size); |
165 | if (!ret && (!nmemb || !size)) | |
166 | ret = calloc(1, 1); | |
167 | if (!ret) | |
168 | die("Out of memory, calloc failed"); | |
169 | } | |
170 | return ret; | |
171 | } | |
172 | ||
0b6806b9 SP |
173 | /* |
174 | * Limit size of IO chunks, because huge chunks only cause pain. OS X | |
175 | * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in | |
382d20e3 | 176 | * the absence of bugs, large chunks can result in bad latencies when |
0b6806b9 | 177 | * you decide to kill the process. |
a983e6ac JH |
178 | * |
179 | * We pick 8 MiB as our default, but if the platform defines SSIZE_MAX | |
180 | * that is smaller than that, clip it to SSIZE_MAX, as a call to | |
181 | * read(2) or write(2) larger than that is allowed to fail. As the last | |
182 | * resort, we allow a port to pass via CFLAGS e.g. "-DMAX_IO_SIZE=value" | |
183 | * to override this, if the definition of SSIZE_MAX given by the platform | |
184 | * is broken. | |
0b6806b9 | 185 | */ |
a983e6ac JH |
186 | #ifndef MAX_IO_SIZE |
187 | # define MAX_IO_SIZE_DEFAULT (8*1024*1024) | |
188 | # if defined(SSIZE_MAX) && (SSIZE_MAX < MAX_IO_SIZE_DEFAULT) | |
189 | # define MAX_IO_SIZE SSIZE_MAX | |
190 | # else | |
191 | # define MAX_IO_SIZE MAX_IO_SIZE_DEFAULT | |
192 | # endif | |
193 | #endif | |
0b6806b9 | 194 | |
3ff53df7 PT |
195 | /** |
196 | * xopen() is the same as open(), but it die()s if the open() fails. | |
197 | */ | |
198 | int xopen(const char *path, int oflag, ...) | |
199 | { | |
200 | mode_t mode = 0; | |
201 | va_list ap; | |
202 | ||
203 | /* | |
204 | * va_arg() will have undefined behavior if the specified type is not | |
205 | * compatible with the argument type. Since integers are promoted to | |
206 | * ints, we fetch the next argument as an int, and then cast it to a | |
207 | * mode_t to avoid undefined behavior. | |
208 | */ | |
209 | va_start(ap, oflag); | |
210 | if (oflag & O_CREAT) | |
211 | mode = va_arg(ap, int); | |
212 | va_end(ap); | |
213 | ||
214 | for (;;) { | |
215 | int fd = open(path, oflag, mode); | |
216 | if (fd >= 0) | |
217 | return fd; | |
218 | if (errno == EINTR) | |
219 | continue; | |
220 | ||
221 | if ((oflag & O_RDWR) == O_RDWR) | |
222 | die_errno(_("could not open '%s' for reading and writing"), path); | |
223 | else if ((oflag & O_WRONLY) == O_WRONLY) | |
224 | die_errno(_("could not open '%s' for writing"), path); | |
225 | else | |
226 | die_errno(_("could not open '%s' for reading"), path); | |
227 | } | |
228 | } | |
229 | ||
d751dd11 EW |
230 | static int handle_nonblock(int fd, short poll_events, int err) |
231 | { | |
232 | struct pollfd pfd; | |
233 | ||
234 | if (err != EAGAIN && err != EWOULDBLOCK) | |
235 | return 0; | |
236 | ||
237 | pfd.fd = fd; | |
238 | pfd.events = poll_events; | |
239 | ||
240 | /* | |
241 | * no need to check for errors, here; | |
242 | * a subsequent read/write will detect unrecoverable errors | |
243 | */ | |
244 | poll(&pfd, 1, -1); | |
245 | return 1; | |
246 | } | |
247 | ||
112db553 LT |
248 | /* |
249 | * xread() is the same a read(), but it automatically restarts read() | |
250 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
251 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
252 | */ | |
253 | ssize_t xread(int fd, void *buf, size_t len) | |
254 | { | |
255 | ssize_t nr; | |
0b6806b9 SP |
256 | if (len > MAX_IO_SIZE) |
257 | len = MAX_IO_SIZE; | |
112db553 LT |
258 | while (1) { |
259 | nr = read(fd, buf, len); | |
1079c4be SB |
260 | if (nr < 0) { |
261 | if (errno == EINTR) | |
262 | continue; | |
d751dd11 | 263 | if (handle_nonblock(fd, POLLIN, errno)) |
c22f6202 | 264 | continue; |
1079c4be | 265 | } |
112db553 LT |
266 | return nr; |
267 | } | |
268 | } | |
269 | ||
270 | /* | |
271 | * xwrite() is the same a write(), but it automatically restarts write() | |
272 | * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT | |
273 | * GUARANTEE that "len" bytes is written even if the operation is successful. | |
274 | */ | |
275 | ssize_t xwrite(int fd, const void *buf, size_t len) | |
276 | { | |
277 | ssize_t nr; | |
0b6806b9 SP |
278 | if (len > MAX_IO_SIZE) |
279 | len = MAX_IO_SIZE; | |
112db553 LT |
280 | while (1) { |
281 | nr = write(fd, buf, len); | |
ef1cf016 EW |
282 | if (nr < 0) { |
283 | if (errno == EINTR) | |
284 | continue; | |
d751dd11 | 285 | if (handle_nonblock(fd, POLLOUT, errno)) |
ef1cf016 | 286 | continue; |
ef1cf016 EW |
287 | } |
288 | ||
9aa91af0 YM |
289 | return nr; |
290 | } | |
291 | } | |
292 | ||
293 | /* | |
294 | * xpread() is the same as pread(), but it automatically restarts pread() | |
295 | * operations with a recoverable error (EAGAIN and EINTR). xpread() DOES | |
296 | * NOT GUARANTEE that "len" bytes is read even if the data is available. | |
297 | */ | |
298 | ssize_t xpread(int fd, void *buf, size_t len, off_t offset) | |
299 | { | |
300 | ssize_t nr; | |
301 | if (len > MAX_IO_SIZE) | |
302 | len = MAX_IO_SIZE; | |
303 | while (1) { | |
304 | nr = pread(fd, buf, len, offset); | |
305 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
112db553 LT |
306 | continue; |
307 | return nr; | |
308 | } | |
309 | } | |
310 | ||
559e840b JH |
311 | ssize_t read_in_full(int fd, void *buf, size_t count) |
312 | { | |
313 | char *p = buf; | |
314 | ssize_t total = 0; | |
315 | ||
316 | while (count > 0) { | |
317 | ssize_t loaded = xread(fd, p, count); | |
56d7c27a JK |
318 | if (loaded < 0) |
319 | return -1; | |
320 | if (loaded == 0) | |
321 | return total; | |
559e840b JH |
322 | count -= loaded; |
323 | p += loaded; | |
324 | total += loaded; | |
325 | } | |
326 | ||
327 | return total; | |
328 | } | |
329 | ||
330 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
331 | { | |
332 | const char *p = buf; | |
333 | ssize_t total = 0; | |
334 | ||
335 | while (count > 0) { | |
336 | ssize_t written = xwrite(fd, p, count); | |
337 | if (written < 0) | |
338 | return -1; | |
339 | if (!written) { | |
340 | errno = ENOSPC; | |
341 | return -1; | |
342 | } | |
343 | count -= written; | |
344 | p += written; | |
345 | total += written; | |
346 | } | |
347 | ||
348 | return total; | |
349 | } | |
350 | ||
426ddeea YM |
351 | ssize_t pread_in_full(int fd, void *buf, size_t count, off_t offset) |
352 | { | |
353 | char *p = buf; | |
354 | ssize_t total = 0; | |
355 | ||
356 | while (count > 0) { | |
357 | ssize_t loaded = xpread(fd, p, count, offset); | |
358 | if (loaded < 0) | |
359 | return -1; | |
360 | if (loaded == 0) | |
361 | return total; | |
362 | count -= loaded; | |
363 | p += loaded; | |
364 | total += loaded; | |
365 | offset += loaded; | |
366 | } | |
367 | ||
368 | return total; | |
369 | } | |
370 | ||
112db553 LT |
371 | int xdup(int fd) |
372 | { | |
373 | int ret = dup(fd); | |
374 | if (ret < 0) | |
d824cbba | 375 | die_errno("dup failed"); |
112db553 LT |
376 | return ret; |
377 | } | |
378 | ||
260eec29 PT |
379 | /** |
380 | * xfopen() is the same as fopen(), but it die()s if the fopen() fails. | |
381 | */ | |
382 | FILE *xfopen(const char *path, const char *mode) | |
383 | { | |
384 | for (;;) { | |
385 | FILE *fp = fopen(path, mode); | |
386 | if (fp) | |
387 | return fp; | |
388 | if (errno == EINTR) | |
389 | continue; | |
390 | ||
391 | if (*mode && mode[1] == '+') | |
392 | die_errno(_("could not open '%s' for reading and writing"), path); | |
393 | else if (*mode == 'w' || *mode == 'a') | |
394 | die_errno(_("could not open '%s' for writing"), path); | |
395 | else | |
396 | die_errno(_("could not open '%s' for reading"), path); | |
397 | } | |
398 | } | |
399 | ||
112db553 LT |
400 | FILE *xfdopen(int fd, const char *mode) |
401 | { | |
402 | FILE *stream = fdopen(fd, mode); | |
403 | if (stream == NULL) | |
d824cbba | 404 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
405 | return stream; |
406 | } | |
407 | ||
79d7582e JS |
408 | FILE *fopen_for_writing(const char *path) |
409 | { | |
410 | FILE *ret = fopen(path, "w"); | |
411 | ||
412 | if (!ret && errno == EPERM) { | |
413 | if (!unlink(path)) | |
414 | ret = fopen(path, "w"); | |
415 | else | |
416 | errno = EPERM; | |
417 | } | |
418 | return ret; | |
419 | } | |
420 | ||
382fb07f NTND |
421 | static void warn_on_inaccessible(const char *path) |
422 | { | |
423 | warning_errno(_("unable to access '%s'"), path); | |
424 | } | |
425 | ||
11dc1fcb NTND |
426 | int warn_on_fopen_errors(const char *path) |
427 | { | |
428 | if (errno != ENOENT && errno != ENOTDIR) { | |
429 | warn_on_inaccessible(path); | |
430 | return -1; | |
431 | } | |
432 | ||
433 | return 0; | |
434 | } | |
435 | ||
e9d983f1 NTND |
436 | FILE *fopen_or_warn(const char *path, const char *mode) |
437 | { | |
438 | FILE *fp = fopen(path, mode); | |
439 | ||
440 | if (fp) | |
441 | return fp; | |
442 | ||
443 | warn_on_fopen_errors(path); | |
444 | return NULL; | |
445 | } | |
446 | ||
112db553 LT |
447 | int xmkstemp(char *template) |
448 | { | |
449 | int fd; | |
6cf6bb3e AE |
450 | char origtemplate[PATH_MAX]; |
451 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
112db553 LT |
452 | |
453 | fd = mkstemp(template); | |
6cf6bb3e AE |
454 | if (fd < 0) { |
455 | int saved_errno = errno; | |
456 | const char *nonrelative_template; | |
457 | ||
f7be59b4 | 458 | if (strlen(template) != strlen(origtemplate)) |
6cf6bb3e AE |
459 | template = origtemplate; |
460 | ||
e2a57aac | 461 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
462 | errno = saved_errno; |
463 | die_errno("Unable to create temporary file '%s'", | |
464 | nonrelative_template); | |
465 | } | |
112db553 LT |
466 | return fd; |
467 | } | |
39c68542 | 468 | |
33f23936 JN |
469 | /* Adapted from libiberty's mkstemp.c. */ |
470 | ||
471 | #undef TMP_MAX | |
472 | #define TMP_MAX 16384 | |
473 | ||
474 | int git_mkstemps_mode(char *pattern, int suffix_len, int mode) | |
475 | { | |
476 | static const char letters[] = | |
477 | "abcdefghijklmnopqrstuvwxyz" | |
478 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
479 | "0123456789"; | |
480 | static const int num_letters = 62; | |
481 | uint64_t value; | |
482 | struct timeval tv; | |
483 | char *template; | |
484 | size_t len; | |
485 | int fd, count; | |
486 | ||
487 | len = strlen(pattern); | |
488 | ||
489 | if (len < 6 + suffix_len) { | |
490 | errno = EINVAL; | |
491 | return -1; | |
492 | } | |
493 | ||
494 | if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) { | |
495 | errno = EINVAL; | |
496 | return -1; | |
497 | } | |
498 | ||
499 | /* | |
500 | * Replace pattern's XXXXXX characters with randomness. | |
501 | * Try TMP_MAX different filenames. | |
502 | */ | |
503 | gettimeofday(&tv, NULL); | |
504 | value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid(); | |
505 | template = &pattern[len - 6 - suffix_len]; | |
506 | for (count = 0; count < TMP_MAX; ++count) { | |
507 | uint64_t v = value; | |
508 | /* Fill in the random bits. */ | |
509 | template[0] = letters[v % num_letters]; v /= num_letters; | |
510 | template[1] = letters[v % num_letters]; v /= num_letters; | |
511 | template[2] = letters[v % num_letters]; v /= num_letters; | |
512 | template[3] = letters[v % num_letters]; v /= num_letters; | |
513 | template[4] = letters[v % num_letters]; v /= num_letters; | |
514 | template[5] = letters[v % num_letters]; v /= num_letters; | |
515 | ||
516 | fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode); | |
a2cb86c1 | 517 | if (fd >= 0) |
33f23936 JN |
518 | return fd; |
519 | /* | |
520 | * Fatal error (EPERM, ENOSPC etc). | |
521 | * It doesn't make sense to loop. | |
522 | */ | |
523 | if (errno != EEXIST) | |
524 | break; | |
525 | /* | |
526 | * This is a random value. It is only necessary that | |
527 | * the next TMP_MAX values generated by adding 7777 to | |
528 | * VALUE are different with (module 2^32). | |
529 | */ | |
530 | value += 7777; | |
531 | } | |
532 | /* We return the null string if we can't find a unique file name. */ | |
533 | pattern[0] = '\0'; | |
534 | return -1; | |
535 | } | |
536 | ||
537 | int git_mkstemp_mode(char *pattern, int mode) | |
538 | { | |
539 | /* mkstemp is just mkstemps with no suffix */ | |
540 | return git_mkstemps_mode(pattern, 0, mode); | |
541 | } | |
542 | ||
b862b61c MM |
543 | int xmkstemp_mode(char *template, int mode) |
544 | { | |
545 | int fd; | |
6cf6bb3e AE |
546 | char origtemplate[PATH_MAX]; |
547 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
b862b61c MM |
548 | |
549 | fd = git_mkstemp_mode(template, mode); | |
6cf6bb3e AE |
550 | if (fd < 0) { |
551 | int saved_errno = errno; | |
552 | const char *nonrelative_template; | |
553 | ||
554 | if (!template[0]) | |
555 | template = origtemplate; | |
556 | ||
e2a57aac | 557 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
558 | errno = saved_errno; |
559 | die_errno("Unable to create temporary file '%s'", | |
560 | nonrelative_template); | |
561 | } | |
b862b61c MM |
562 | return fd; |
563 | } | |
564 | ||
10e13ec8 | 565 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 566 | { |
1054af7d RS |
567 | int err; |
568 | if (!rc || errno == ENOENT) | |
569 | return 0; | |
570 | err = errno; | |
1da045fb | 571 | warning_errno("unable to %s %s", op, file); |
1054af7d | 572 | errno = err; |
fc71db39 AR |
573 | return rc; |
574 | } | |
575 | ||
9ccc0c08 RS |
576 | int unlink_or_msg(const char *file, struct strbuf *err) |
577 | { | |
578 | int rc = unlink(file); | |
579 | ||
580 | assert(err); | |
581 | ||
582 | if (!rc || errno == ENOENT) | |
583 | return 0; | |
584 | ||
585 | strbuf_addf(err, "unable to unlink %s: %s", | |
586 | file, strerror(errno)); | |
587 | return -1; | |
588 | } | |
589 | ||
10e13ec8 PC |
590 | int unlink_or_warn(const char *file) |
591 | { | |
592 | return warn_if_unremovable("unlink", file, unlink(file)); | |
593 | } | |
d1723296 PC |
594 | |
595 | int rmdir_or_warn(const char *file) | |
596 | { | |
597 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
598 | } | |
80d706af PC |
599 | |
600 | int remove_or_warn(unsigned int mode, const char *file) | |
601 | { | |
602 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
603 | } | |
2f705875 | 604 | |
4698c8fe JN |
605 | static int access_error_is_ok(int err, unsigned flag) |
606 | { | |
c7054209 JH |
607 | return (is_missing_file_error(err) || |
608 | ((flag & ACCESS_EACCES_OK) && err == EACCES)); | |
4698c8fe JN |
609 | } |
610 | ||
611 | int access_or_warn(const char *path, int mode, unsigned flag) | |
ba8bd830 JK |
612 | { |
613 | int ret = access(path, mode); | |
4698c8fe | 614 | if (ret && !access_error_is_ok(errno, flag)) |
55b38a48 | 615 | warn_on_inaccessible(path); |
ba8bd830 JK |
616 | return ret; |
617 | } | |
618 | ||
4698c8fe | 619 | int access_or_die(const char *path, int mode, unsigned flag) |
96b9e0e3 JN |
620 | { |
621 | int ret = access(path, mode); | |
4698c8fe | 622 | if (ret && !access_error_is_ok(errno, flag)) |
96b9e0e3 JN |
623 | die_errno(_("unable to access '%s'"), path); |
624 | return ret; | |
625 | } | |
626 | ||
aa14e980 RS |
627 | char *xgetcwd(void) |
628 | { | |
629 | struct strbuf sb = STRBUF_INIT; | |
630 | if (strbuf_getcwd(&sb)) | |
631 | die_errno(_("unable to get current working directory")); | |
632 | return strbuf_detach(&sb, NULL); | |
633 | } | |
316e53e6 | 634 | |
7b03c89e JK |
635 | int xsnprintf(char *dst, size_t max, const char *fmt, ...) |
636 | { | |
637 | va_list ap; | |
638 | int len; | |
639 | ||
640 | va_start(ap, fmt); | |
641 | len = vsnprintf(dst, max, fmt, ap); | |
642 | va_end(ap); | |
643 | ||
644 | if (len < 0) | |
645 | die("BUG: your snprintf is broken"); | |
646 | if (len >= max) | |
647 | die("BUG: attempt to snprintf into too-small buffer"); | |
648 | return len; | |
649 | } | |
650 | ||
52563d7e | 651 | void write_file_buf(const char *path, const char *buf, size_t len) |
316e53e6 | 652 | { |
52563d7e JK |
653 | int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666); |
654 | if (write_in_full(fd, buf, len) != len) | |
655 | die_errno(_("could not write to %s"), path); | |
656 | if (close(fd)) | |
657 | die_errno(_("could not close %s"), path); | |
316e53e6 | 658 | } |
2024d317 | 659 | |
ef22318c | 660 | void write_file(const char *path, const char *fmt, ...) |
12d6ce1d | 661 | { |
12d6ce1d | 662 | va_list params; |
316e53e6 | 663 | struct strbuf sb = STRBUF_INIT; |
12d6ce1d JH |
664 | |
665 | va_start(params, fmt); | |
ef22318c | 666 | strbuf_vaddf(&sb, fmt, params); |
12d6ce1d | 667 | va_end(params); |
12d6ce1d | 668 | |
ef22318c | 669 | strbuf_complete_line(&sb); |
12d6ce1d | 670 | |
52563d7e | 671 | write_file_buf(path, sb.buf, sb.len); |
ef22318c | 672 | strbuf_release(&sb); |
12d6ce1d JH |
673 | } |
674 | ||
2024d317 JS |
675 | void sleep_millisec(int millisec) |
676 | { | |
677 | poll(NULL, 0, millisec); | |
678 | } | |
5781a9a2 DT |
679 | |
680 | int xgethostname(char *buf, size_t len) | |
681 | { | |
682 | /* | |
683 | * If the full hostname doesn't fit in buf, POSIX does not | |
684 | * specify whether the buffer will be null-terminated, so to | |
685 | * be safe, do it ourselves. | |
686 | */ | |
687 | int ret = gethostname(buf, len); | |
688 | if (!ret) | |
689 | buf[len - 1] = 0; | |
690 | return ret; | |
691 | } |