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chromium / external / github.com / git / git / refs/tags/v2.11.0 / . / wrapper.c
blob: e7f197996868a614c84537ad96fc672ea901148d [file] [log] [blame]
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]1/*
2 * Various trivial helper wrappers around standard functions
3 */
4#include "cache.h"
5
Jonathan Niedere0500292010-11-06 19:00:38[diff] [blame]6static void do_nothing(size_t size)
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]7{
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]8}
9
Jonathan Niedere0500292010-11-06 19:00:38[diff] [blame]10static void (*try_to_free_routine)(size_t size) = do_nothing;
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]11
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]12static int memory_limit_check(size_t size, int gentle)
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]13{
Steffen Prohaska9927d962014-08-26 15:23:22[diff] [blame]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;
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]19 }
Junio C Hamanof0d89002014-10-08 20:05:32[diff] [blame]20 if (size > limit) {
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]21 if (gentle) {
Junio C Hamanof0d89002014-10-08 20:05:32[diff] [blame]22 error("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
23 (uintmax_t)size, (uintmax_t)limit);
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]24 return -1;
25 } else
Junio C Hamanof0d89002014-10-08 20:05:32[diff] [blame]26 die("attempting to allocate %"PRIuMAX" over limit %"PRIuMAX,
27 (uintmax_t)size, (uintmax_t)limit);
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]28 }
29 return 0;
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]30}
31
Johannes Sixt851c34b2010-05-08 15:13:49[diff] [blame]32try_to_free_t set_try_to_free_routine(try_to_free_t routine)
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]33{
Johannes Sixt851c34b2010-05-08 15:13:49[diff] [blame]34 try_to_free_t old = try_to_free_routine;
Junio C Hamano00b0d7f2010-12-21 17:24:18[diff] [blame]35 if (!routine)
36 routine = do_nothing;
Johannes Sixt851c34b2010-05-08 15:13:49[diff] [blame]37 try_to_free_routine = routine;
38 return old;
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]39}
40
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]41char *xstrdup(const char *str)
42{
43 char *ret = strdup(str);
44 if (!ret) {
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]45 try_to_free_routine(strlen(str) + 1);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]46 ret = strdup(str);
47 if (!ret)
48 die("Out of memory, strdup failed");
49 }
50 return ret;
51}
52
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]53static void *do_xmalloc(size_t size, int gentle)
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]54{
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]55 void *ret;
56
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]57 if (memory_limit_check(size, gentle))
58 return NULL;
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]59 ret = malloc(size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]60 if (!ret && !size)
61 ret = malloc(1);
62 if (!ret) {
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]63 try_to_free_routine(size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]64 ret = malloc(size);
65 if (!ret && !size)
66 ret = malloc(1);
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]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 }
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]77 }
78#ifdef XMALLOC_POISON
79 memset(ret, 0xA5, size);
80#endif
81 return ret;
82}
83
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]84void *xmalloc(size_t size)
85{
86 return do_xmalloc(size, 0);
87}
88
89static void *do_xmallocz(size_t size, int gentle)
Ilari Liusvaara5bf92192010-01-26 18:24:12[diff] [blame]90{
91 void *ret;
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]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;
Ilari Liusvaara5bf92192010-01-26 18:24:12[diff] [blame]102 return ret;
103}
104
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]105void *xmallocz(size_t size)
106{
107 return do_xmallocz(size, 0);
108}
109
110void *xmallocz_gently(size_t size)
111{
112 return do_xmallocz(size, 1);
113}
114
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]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 */
121void *xmemdupz(const void *data, size_t len)
122{
Ilari Liusvaara5bf92192010-01-26 18:24:12[diff] [blame]123 return memcpy(xmallocz(len), data, len);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]124}
125
126char *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
132void *xrealloc(void *ptr, size_t size)
133{
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]134 void *ret;
135
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]136 memory_limit_check(size, 0);
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]137 ret = realloc(ptr, size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]138 if (!ret && !size)
139 ret = realloc(ptr, 1);
140 if (!ret) {
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]141 try_to_free_routine(size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]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
151void *xcalloc(size_t nmemb, size_t size)
152{
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]153 void *ret;
154
Jeff Kinge7792a72016-02-22 22:43:18[diff] [blame]155 if (unsigned_mult_overflows(nmemb, size))
156 die("data too large to fit into virtual memory space");
157
Nguyễn Thái Ngọc Duyf8bb1d92014-08-16 03:08:02[diff] [blame]158 memory_limit_check(size * nmemb, 0);
Nguyễn Thái Ngọc Duyd41489a2012-03-07 10:54:16[diff] [blame]159 ret = calloc(nmemb, size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]160 if (!ret && (!nmemb || !size))
161 ret = calloc(1, 1);
162 if (!ret) {
Nicolas Pitrea9a74632010-03-24 20:22:34[diff] [blame]163 try_to_free_routine(nmemb * size);
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]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
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]173/*
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]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
Masanari Iida382d20e2013-11-12 15:17:42[diff] [blame]176 * the absence of bugs, large chunks can result in bad latencies when
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]177 * you decide to kill the process.
Junio C Hamanoa983e6a2015-02-11 21:13:10[diff] [blame]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.
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]185 */
Junio C Hamanoa983e6a2015-02-11 21:13:10[diff] [blame]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
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]194
Paul Tan3ff53df2015-08-04 13:51:22[diff] [blame]195/**
196 * xopen() is the same as open(), but it die()s if the open() fails.
197 */
198int 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
Eric Wongd751dd12016-07-10 08:20:46[diff] [blame]230static 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
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]248/*
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]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 */
253ssize_t xread(int fd, void *buf, size_t len)
254{
255 ssize_t nr;
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]256 if (len > MAX_IO_SIZE)
257 len = MAX_IO_SIZE;
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]258 while (1) {
259 nr = read(fd, buf, len);
Stefan Beller1079c4b2015-12-16 00:04:07[diff] [blame]260 if (nr < 0) {
261 if (errno == EINTR)
262 continue;
Eric Wongd751dd12016-07-10 08:20:46[diff] [blame]263 if (handle_nonblock(fd, POLLIN, errno))
Eric Wongc22f6202016-06-27 03:56:35[diff] [blame]264 continue;
Stefan Beller1079c4b2015-12-16 00:04:07[diff] [blame]265 }
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]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 */
275ssize_t xwrite(int fd, const void *buf, size_t len)
276{
277 ssize_t nr;
Steffen Prohaska0b6806b2013-08-20 06:43:54[diff] [blame]278 if (len > MAX_IO_SIZE)
279 len = MAX_IO_SIZE;
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]280 while (1) {
281 nr = write(fd, buf, len);
Eric Wongef1cf012016-06-26 23:21:12[diff] [blame]282 if (nr < 0) {
283 if (errno == EINTR)
284 continue;
Eric Wongd751dd12016-07-10 08:20:46[diff] [blame]285 if (handle_nonblock(fd, POLLOUT, errno))
Eric Wongef1cf012016-06-26 23:21:12[diff] [blame]286 continue;
Eric Wongef1cf012016-06-26 23:21:12[diff] [blame]287 }
288
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]289 return nr;
290 }
291}
292
Yiannis Marangos9aa91af2014-04-10 18:54:12[diff] [blame]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 */
298ssize_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))
306 continue;
307 return nr;
308 }
309}
310
Junio C Hamano559e8402008-07-20 23:13:05[diff] [blame]311ssize_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);
Jeff King56d7c272011-05-26 16:30:27[diff] [blame]318 if (loaded < 0)
319 return -1;
320 if (loaded == 0)
321 return total;
Junio C Hamano559e8402008-07-20 23:13:05[diff] [blame]322 count -= loaded;
323 p += loaded;
324 total += loaded;
325 }
326
327 return total;
328}
329
330ssize_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
Yiannis Marangos426ddee2014-04-10 18:31:21[diff] [blame]351ssize_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
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]371int xdup(int fd)
372{
373 int ret = dup(fd);
374 if (ret < 0)
Thomas Rastd824cbb2009-06-27 15:58:46[diff] [blame]375 die_errno("dup failed");
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]376 return ret;
377}
378
Paul Tan260eec22015-08-04 13:51:23[diff] [blame]379/**
380 * xfopen() is the same as fopen(), but it die()s if the fopen() fails.
381 */
382FILE *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
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]400FILE *xfdopen(int fd, const char *mode)
401{
402 FILE *stream = fdopen(fd, mode);
403 if (stream == NULL)
Thomas Rastd824cbb2009-06-27 15:58:46[diff] [blame]404 die_errno("Out of memory? fdopen failed");
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]405 return stream;
406}
407
Johannes Schindelin79d75822016-01-06 13:09:43[diff] [blame]408FILE *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
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]421int xmkstemp(char *template)
422{
423 int fd;
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]424 char origtemplate[PATH_MAX];
425 strlcpy(origtemplate, template, sizeof(origtemplate));
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]426
427 fd = mkstemp(template);
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]428 if (fd < 0) {
429 int saved_errno = errno;
430 const char *nonrelative_template;
431
Junio C Hamanof7be59b2012-12-18 20:51:35[diff] [blame]432 if (strlen(template) != strlen(origtemplate))
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]433 template = origtemplate;
434
Carlos Martín Nietoe2a57aa2011-03-17 11:26:46[diff] [blame]435 nonrelative_template = absolute_path(template);
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]436 errno = saved_errno;
437 die_errno("Unable to create temporary file '%s'",
438 nonrelative_template);
439 }
Linus Torvalds112db552008-06-22 19:19:25[diff] [blame]440 return fd;
441}
Linus Torvalds39c68542009-01-08 03:54:47[diff] [blame]442
Jonathan Nieder33f23932010-11-06 11:46:31[diff] [blame]443/* git_mkstemp() - create tmp file honoring TMPDIR variable */
444int git_mkstemp(char *path, size_t len, const char *template)
445{
446 const char *tmp;
447 size_t n;
448
449 tmp = getenv("TMPDIR");
450 if (!tmp)
451 tmp = "/tmp";
452 n = snprintf(path, len, "%s/%s", tmp, template);
453 if (len <= n) {
454 errno = ENAMETOOLONG;
455 return -1;
456 }
457 return mkstemp(path);
458}
459
Jonathan Nieder33f23932010-11-06 11:46:31[diff] [blame]460/* Adapted from libiberty's mkstemp.c. */
461
462#undef TMP_MAX
463#define TMP_MAX 16384
464
465int git_mkstemps_mode(char *pattern, int suffix_len, int mode)
466{
467 static const char letters[] =
468 "abcdefghijklmnopqrstuvwxyz"
469 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
470 "0123456789";
471 static const int num_letters = 62;
472 uint64_t value;
473 struct timeval tv;
474 char *template;
475 size_t len;
476 int fd, count;
477
478 len = strlen(pattern);
479
480 if (len < 6 + suffix_len) {
481 errno = EINVAL;
482 return -1;
483 }
484
485 if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) {
486 errno = EINVAL;
487 return -1;
488 }
489
490 /*
491 * Replace pattern's XXXXXX characters with randomness.
492 * Try TMP_MAX different filenames.
493 */
494 gettimeofday(&tv, NULL);
495 value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid();
496 template = &pattern[len - 6 - suffix_len];
497 for (count = 0; count < TMP_MAX; ++count) {
498 uint64_t v = value;
499 /* Fill in the random bits. */
500 template[0] = letters[v % num_letters]; v /= num_letters;
501 template[1] = letters[v % num_letters]; v /= num_letters;
502 template[2] = letters[v % num_letters]; v /= num_letters;
503 template[3] = letters[v % num_letters]; v /= num_letters;
504 template[4] = letters[v % num_letters]; v /= num_letters;
505 template[5] = letters[v % num_letters]; v /= num_letters;
506
507 fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode);
Dale R. Worleya2cb86c2013-07-12 08:58:35[diff] [blame]508 if (fd >= 0)
Jonathan Nieder33f23932010-11-06 11:46:31[diff] [blame]509 return fd;
510 /*
511 * Fatal error (EPERM, ENOSPC etc).
512 * It doesn't make sense to loop.
513 */
514 if (errno != EEXIST)
515 break;
516 /*
517 * This is a random value. It is only necessary that
518 * the next TMP_MAX values generated by adding 7777 to
519 * VALUE are different with (module 2^32).
520 */
521 value += 7777;
522 }
523 /* We return the null string if we can't find a unique file name. */
524 pattern[0] = '\0';
525 return -1;
526}
527
528int git_mkstemp_mode(char *pattern, int mode)
529{
530 /* mkstemp is just mkstemps with no suffix */
531 return git_mkstemps_mode(pattern, 0, mode);
532}
533
Ramsay Jonesec145c92013-10-06 20:50:00[diff] [blame]534#ifdef NO_MKSTEMPS
Jonathan Nieder33f23932010-11-06 11:46:31[diff] [blame]535int gitmkstemps(char *pattern, int suffix_len)
536{
537 return git_mkstemps_mode(pattern, suffix_len, 0600);
538}
Ramsay Jonesec145c92013-10-06 20:50:00[diff] [blame]539#endif
Jonathan Nieder33f23932010-11-06 11:46:31[diff] [blame]540
Matthieu Moyb862b612010-02-22 22:32:13[diff] [blame]541int xmkstemp_mode(char *template, int mode)
542{
543 int fd;
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]544 char origtemplate[PATH_MAX];
545 strlcpy(origtemplate, template, sizeof(origtemplate));
Matthieu Moyb862b612010-02-22 22:32:13[diff] [blame]546
547 fd = git_mkstemp_mode(template, mode);
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]548 if (fd < 0) {
549 int saved_errno = errno;
550 const char *nonrelative_template;
551
552 if (!template[0])
553 template = origtemplate;
554
Carlos Martín Nietoe2a57aa2011-03-17 11:26:46[diff] [blame]555 nonrelative_template = absolute_path(template);
Arnout Engelen6cf6bb32010-12-18 21:28:00[diff] [blame]556 errno = saved_errno;
557 die_errno("Unable to create temporary file '%s'",
558 nonrelative_template);
559 }
Matthieu Moyb862b612010-02-22 22:32:13[diff] [blame]560 return fd;
561}
562
Peter Collingbourne10e13ec2010-03-26 15:25:32[diff] [blame]563static int warn_if_unremovable(const char *op, const char *file, int rc)
Alex Riesenfc71db32009-04-29 21:21:46[diff] [blame]564{
Ronnie Sahlberg1054af72014-07-16 18:01:18[diff] [blame]565 int err;
566 if (!rc || errno == ENOENT)
567 return 0;
568 err = errno;
Nguyễn Thái Ngọc Duy1da045f2016-05-08 09:48:01[diff] [blame]569 warning_errno("unable to %s %s", op, file);
Ronnie Sahlberg1054af72014-07-16 18:01:18[diff] [blame]570 errno = err;
Alex Riesenfc71db32009-04-29 21:21:46[diff] [blame]571 return rc;
572}
573
Ronnie Sahlberg9ccc0c02014-07-16 18:20:36[diff] [blame]574int unlink_or_msg(const char *file, struct strbuf *err)
575{
576 int rc = unlink(file);
577
578 assert(err);
579
580 if (!rc || errno == ENOENT)
581 return 0;
582
583 strbuf_addf(err, "unable to unlink %s: %s",
584 file, strerror(errno));
585 return -1;
586}
587
Peter Collingbourne10e13ec2010-03-26 15:25:32[diff] [blame]588int unlink_or_warn(const char *file)
589{
590 return warn_if_unremovable("unlink", file, unlink(file));
591}
Peter Collingbourned1723292010-03-26 15:25:33[diff] [blame]592
593int rmdir_or_warn(const char *file)
594{
595 return warn_if_unremovable("rmdir", file, rmdir(file));
596}
Peter Collingbourne80d706a2010-03-26 15:25:34[diff] [blame]597
598int remove_or_warn(unsigned int mode, const char *file)
599{
600 return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);
601}
Jeff King2f705872012-05-21 23:10:20[diff] [blame]602
Junio C Hamano55b38a42012-08-21 21:52:07[diff] [blame]603void warn_on_inaccessible(const char *path)
604{
Nguyễn Thái Ngọc Duy1da045f2016-05-08 09:48:01[diff] [blame]605 warning_errno(_("unable to access '%s'"), path);
Junio C Hamano55b38a42012-08-21 21:52:07[diff] [blame]606}
607
Jonathan Nieder4698c8f2013-04-12 21:03:18[diff] [blame]608static int access_error_is_ok(int err, unsigned flag)
609{
610 return err == ENOENT || err == ENOTDIR ||
611 ((flag & ACCESS_EACCES_OK) && err == EACCES);
612}
613
614int access_or_warn(const char *path, int mode, unsigned flag)
Jeff Kingba8bd832012-08-21 06:10:59[diff] [blame]615{
616 int ret = access(path, mode);
Jonathan Nieder4698c8f2013-04-12 21:03:18[diff] [blame]617 if (ret && !access_error_is_ok(errno, flag))
Junio C Hamano55b38a42012-08-21 21:52:07[diff] [blame]618 warn_on_inaccessible(path);
Jeff Kingba8bd832012-08-21 06:10:59[diff] [blame]619 return ret;
620}
621
Jonathan Nieder4698c8f2013-04-12 21:03:18[diff] [blame]622int access_or_die(const char *path, int mode, unsigned flag)
Jonathan Nieder96b9e0e2012-10-14 00:04:02[diff] [blame]623{
624 int ret = access(path, mode);
Jonathan Nieder4698c8f2013-04-12 21:03:18[diff] [blame]625 if (ret && !access_error_is_ok(errno, flag))
Jonathan Nieder96b9e0e2012-10-14 00:04:02[diff] [blame]626 die_errno(_("unable to access '%s'"), path);
627 return ret;
628}
629
René Scharfeaa14e982014-07-28 18:29:50[diff] [blame]630char *xgetcwd(void)
631{
632 struct strbuf sb = STRBUF_INIT;
633 if (strbuf_getcwd(&sb))
634 die_errno(_("unable to get current working directory"));
635 return strbuf_detach(&sb, NULL);
636}
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]637
Jeff King7b03c892015-09-24 21:05:37[diff] [blame]638int xsnprintf(char *dst, size_t max, const char *fmt, ...)
639{
640 va_list ap;
641 int len;
642
643 va_start(ap, fmt);
644 len = vsnprintf(dst, max, fmt, ap);
645 va_end(ap);
646
647 if (len < 0)
648 die("BUG: your snprintf is broken");
649 if (len >= max)
650 die("BUG: attempt to snprintf into too-small buffer");
651 return len;
652}
653
Jeff King52563d72016-07-08 09:12:22[diff] [blame]654void write_file_buf(const char *path, const char *buf, size_t len)
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]655{
Jeff King52563d72016-07-08 09:12:22[diff] [blame]656 int fd = xopen(path, O_WRONLY | O_CREAT | O_TRUNC, 0666);
657 if (write_in_full(fd, buf, len) != len)
658 die_errno(_("could not write to %s"), path);
659 if (close(fd))
660 die_errno(_("could not close %s"), path);
661}
662
Jeff Kingef223182016-07-08 09:09:34[diff] [blame]663void write_file(const char *path, const char *fmt, ...)
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]664{
Jeff Kingef223182016-07-08 09:09:34[diff] [blame]665 va_list params;
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]666 struct strbuf sb = STRBUF_INIT;
Jeff Kingef223182016-07-08 09:09:34[diff] [blame]667
668 va_start(params, fmt);
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]669 strbuf_vaddf(&sb, fmt, params);
Jeff Kingef223182016-07-08 09:09:34[diff] [blame]670 va_end(params);
671
Junio C Hamanoe7ffa382015-08-24 16:39:48[diff] [blame]672 strbuf_complete_line(&sb);
Jeff King52563d72016-07-08 09:12:22[diff] [blame]673
674 write_file_buf(path, sb.buf, sb.len);
Nguyễn Thái Ngọc Duy316e53e2014-11-30 08:24:45[diff] [blame]675 strbuf_release(&sb);
Junio C Hamano12d6ce12015-08-24 20:03:07[diff] [blame]676}
677
Johannes Sixt2024d312015-06-05 19:45:05[diff] [blame]678void sleep_millisec(int millisec)
679{
680 poll(NULL, 0, millisec);
681}