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Commit | Line | Data |
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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 | |
d41489a6 NTND |
12 | static void memory_limit_check(size_t size) |
13 | { | |
14 | static int limit = -1; | |
15 | if (limit == -1) { | |
16 | const char *env = getenv("GIT_ALLOC_LIMIT"); | |
17 | limit = env ? atoi(env) * 1024 : 0; | |
18 | } | |
19 | if (limit && size > limit) | |
20 | die("attempting to allocate %"PRIuMAX" over limit %d", | |
21 | (intmax_t)size, limit); | |
22 | } | |
23 | ||
851c34b0 | 24 | try_to_free_t set_try_to_free_routine(try_to_free_t routine) |
a9a74636 | 25 | { |
851c34b0 | 26 | try_to_free_t old = try_to_free_routine; |
00b0d7f7 JH |
27 | if (!routine) |
28 | routine = do_nothing; | |
851c34b0 JS |
29 | try_to_free_routine = routine; |
30 | return old; | |
a9a74636 NP |
31 | } |
32 | ||
112db553 LT |
33 | char *xstrdup(const char *str) |
34 | { | |
35 | char *ret = strdup(str); | |
36 | if (!ret) { | |
a9a74636 | 37 | try_to_free_routine(strlen(str) + 1); |
112db553 LT |
38 | ret = strdup(str); |
39 | if (!ret) | |
40 | die("Out of memory, strdup failed"); | |
41 | } | |
42 | return ret; | |
43 | } | |
44 | ||
45 | void *xmalloc(size_t size) | |
46 | { | |
d41489a6 NTND |
47 | void *ret; |
48 | ||
49 | memory_limit_check(size); | |
50 | ret = malloc(size); | |
112db553 LT |
51 | if (!ret && !size) |
52 | ret = malloc(1); | |
53 | if (!ret) { | |
a9a74636 | 54 | try_to_free_routine(size); |
112db553 LT |
55 | ret = malloc(size); |
56 | if (!ret && !size) | |
57 | ret = malloc(1); | |
58 | if (!ret) | |
8bd9fd50 MM |
59 | die("Out of memory, malloc failed (tried to allocate %lu bytes)", |
60 | (unsigned long)size); | |
112db553 LT |
61 | } |
62 | #ifdef XMALLOC_POISON | |
63 | memset(ret, 0xA5, size); | |
64 | #endif | |
65 | return ret; | |
66 | } | |
67 | ||
5bf9219d IL |
68 | void *xmallocz(size_t size) |
69 | { | |
70 | void *ret; | |
1368f650 | 71 | if (unsigned_add_overflows(size, 1)) |
5bf9219d IL |
72 | die("Data too large to fit into virtual memory space."); |
73 | ret = xmalloc(size + 1); | |
74 | ((char*)ret)[size] = 0; | |
75 | return ret; | |
76 | } | |
77 | ||
112db553 LT |
78 | /* |
79 | * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of | |
80 | * "data" to the allocated memory, zero terminates the allocated memory, | |
81 | * and returns a pointer to the allocated memory. If the allocation fails, | |
82 | * the program dies. | |
83 | */ | |
84 | void *xmemdupz(const void *data, size_t len) | |
85 | { | |
5bf9219d | 86 | return memcpy(xmallocz(len), data, len); |
112db553 LT |
87 | } |
88 | ||
89 | char *xstrndup(const char *str, size_t len) | |
90 | { | |
91 | char *p = memchr(str, '\0', len); | |
92 | return xmemdupz(str, p ? p - str : len); | |
93 | } | |
94 | ||
95 | void *xrealloc(void *ptr, size_t size) | |
96 | { | |
d41489a6 NTND |
97 | void *ret; |
98 | ||
99 | memory_limit_check(size); | |
100 | ret = realloc(ptr, size); | |
112db553 LT |
101 | if (!ret && !size) |
102 | ret = realloc(ptr, 1); | |
103 | if (!ret) { | |
a9a74636 | 104 | try_to_free_routine(size); |
112db553 LT |
105 | ret = realloc(ptr, size); |
106 | if (!ret && !size) | |
107 | ret = realloc(ptr, 1); | |
108 | if (!ret) | |
109 | die("Out of memory, realloc failed"); | |
110 | } | |
111 | return ret; | |
112 | } | |
113 | ||
114 | void *xcalloc(size_t nmemb, size_t size) | |
115 | { | |
d41489a6 NTND |
116 | void *ret; |
117 | ||
118 | memory_limit_check(size * nmemb); | |
119 | ret = calloc(nmemb, size); | |
112db553 LT |
120 | if (!ret && (!nmemb || !size)) |
121 | ret = calloc(1, 1); | |
122 | if (!ret) { | |
a9a74636 | 123 | try_to_free_routine(nmemb * size); |
112db553 LT |
124 | ret = calloc(nmemb, size); |
125 | if (!ret && (!nmemb || !size)) | |
126 | ret = calloc(1, 1); | |
127 | if (!ret) | |
128 | die("Out of memory, calloc failed"); | |
129 | } | |
130 | return ret; | |
131 | } | |
132 | ||
0b6806b9 SP |
133 | /* |
134 | * Limit size of IO chunks, because huge chunks only cause pain. OS X | |
135 | * 64-bit is buggy, returning EINVAL if len >= INT_MAX; and even in | |
136 | * the absense of bugs, large chunks can result in bad latencies when | |
137 | * you decide to kill the process. | |
138 | */ | |
139 | #define MAX_IO_SIZE (8*1024*1024) | |
140 | ||
112db553 LT |
141 | /* |
142 | * xread() is the same a read(), but it automatically restarts read() | |
143 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
144 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
145 | */ | |
146 | ssize_t xread(int fd, void *buf, size_t len) | |
147 | { | |
148 | ssize_t nr; | |
0b6806b9 SP |
149 | if (len > MAX_IO_SIZE) |
150 | len = MAX_IO_SIZE; | |
112db553 LT |
151 | while (1) { |
152 | nr = read(fd, buf, len); | |
153 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
154 | continue; | |
155 | return nr; | |
156 | } | |
157 | } | |
158 | ||
159 | /* | |
160 | * xwrite() is the same a write(), but it automatically restarts write() | |
161 | * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT | |
162 | * GUARANTEE that "len" bytes is written even if the operation is successful. | |
163 | */ | |
164 | ssize_t xwrite(int fd, const void *buf, size_t len) | |
165 | { | |
166 | ssize_t nr; | |
0b6806b9 SP |
167 | if (len > MAX_IO_SIZE) |
168 | len = MAX_IO_SIZE; | |
112db553 LT |
169 | while (1) { |
170 | nr = write(fd, buf, len); | |
171 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
172 | continue; | |
173 | return nr; | |
174 | } | |
175 | } | |
176 | ||
559e840b JH |
177 | ssize_t read_in_full(int fd, void *buf, size_t count) |
178 | { | |
179 | char *p = buf; | |
180 | ssize_t total = 0; | |
181 | ||
182 | while (count > 0) { | |
183 | ssize_t loaded = xread(fd, p, count); | |
56d7c27a JK |
184 | if (loaded < 0) |
185 | return -1; | |
186 | if (loaded == 0) | |
187 | return total; | |
559e840b JH |
188 | count -= loaded; |
189 | p += loaded; | |
190 | total += loaded; | |
191 | } | |
192 | ||
193 | return total; | |
194 | } | |
195 | ||
196 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
197 | { | |
198 | const char *p = buf; | |
199 | ssize_t total = 0; | |
200 | ||
201 | while (count > 0) { | |
202 | ssize_t written = xwrite(fd, p, count); | |
203 | if (written < 0) | |
204 | return -1; | |
205 | if (!written) { | |
206 | errno = ENOSPC; | |
207 | return -1; | |
208 | } | |
209 | count -= written; | |
210 | p += written; | |
211 | total += written; | |
212 | } | |
213 | ||
214 | return total; | |
215 | } | |
216 | ||
112db553 LT |
217 | int xdup(int fd) |
218 | { | |
219 | int ret = dup(fd); | |
220 | if (ret < 0) | |
d824cbba | 221 | die_errno("dup failed"); |
112db553 LT |
222 | return ret; |
223 | } | |
224 | ||
225 | FILE *xfdopen(int fd, const char *mode) | |
226 | { | |
227 | FILE *stream = fdopen(fd, mode); | |
228 | if (stream == NULL) | |
d824cbba | 229 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
230 | return stream; |
231 | } | |
232 | ||
233 | int xmkstemp(char *template) | |
234 | { | |
235 | int fd; | |
6cf6bb3e AE |
236 | char origtemplate[PATH_MAX]; |
237 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
112db553 LT |
238 | |
239 | fd = mkstemp(template); | |
6cf6bb3e AE |
240 | if (fd < 0) { |
241 | int saved_errno = errno; | |
242 | const char *nonrelative_template; | |
243 | ||
f7be59b4 | 244 | if (strlen(template) != strlen(origtemplate)) |
6cf6bb3e AE |
245 | template = origtemplate; |
246 | ||
e2a57aac | 247 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
248 | errno = saved_errno; |
249 | die_errno("Unable to create temporary file '%s'", | |
250 | nonrelative_template); | |
251 | } | |
112db553 LT |
252 | return fd; |
253 | } | |
39c68542 | 254 | |
33f23936 JN |
255 | /* git_mkstemp() - create tmp file honoring TMPDIR variable */ |
256 | int git_mkstemp(char *path, size_t len, const char *template) | |
257 | { | |
258 | const char *tmp; | |
259 | size_t n; | |
260 | ||
261 | tmp = getenv("TMPDIR"); | |
262 | if (!tmp) | |
263 | tmp = "/tmp"; | |
264 | n = snprintf(path, len, "%s/%s", tmp, template); | |
265 | if (len <= n) { | |
266 | errno = ENAMETOOLONG; | |
267 | return -1; | |
268 | } | |
269 | return mkstemp(path); | |
270 | } | |
271 | ||
272 | /* git_mkstemps() - create tmp file with suffix honoring TMPDIR variable. */ | |
273 | int git_mkstemps(char *path, size_t len, const char *template, int suffix_len) | |
274 | { | |
275 | const char *tmp; | |
276 | size_t n; | |
277 | ||
278 | tmp = getenv("TMPDIR"); | |
279 | if (!tmp) | |
280 | tmp = "/tmp"; | |
281 | n = snprintf(path, len, "%s/%s", tmp, template); | |
282 | if (len <= n) { | |
283 | errno = ENAMETOOLONG; | |
284 | return -1; | |
285 | } | |
286 | return mkstemps(path, suffix_len); | |
287 | } | |
288 | ||
289 | /* Adapted from libiberty's mkstemp.c. */ | |
290 | ||
291 | #undef TMP_MAX | |
292 | #define TMP_MAX 16384 | |
293 | ||
294 | int git_mkstemps_mode(char *pattern, int suffix_len, int mode) | |
295 | { | |
296 | static const char letters[] = | |
297 | "abcdefghijklmnopqrstuvwxyz" | |
298 | "ABCDEFGHIJKLMNOPQRSTUVWXYZ" | |
299 | "0123456789"; | |
300 | static const int num_letters = 62; | |
301 | uint64_t value; | |
302 | struct timeval tv; | |
303 | char *template; | |
304 | size_t len; | |
305 | int fd, count; | |
306 | ||
307 | len = strlen(pattern); | |
308 | ||
309 | if (len < 6 + suffix_len) { | |
310 | errno = EINVAL; | |
311 | return -1; | |
312 | } | |
313 | ||
314 | if (strncmp(&pattern[len - 6 - suffix_len], "XXXXXX", 6)) { | |
315 | errno = EINVAL; | |
316 | return -1; | |
317 | } | |
318 | ||
319 | /* | |
320 | * Replace pattern's XXXXXX characters with randomness. | |
321 | * Try TMP_MAX different filenames. | |
322 | */ | |
323 | gettimeofday(&tv, NULL); | |
324 | value = ((size_t)(tv.tv_usec << 16)) ^ tv.tv_sec ^ getpid(); | |
325 | template = &pattern[len - 6 - suffix_len]; | |
326 | for (count = 0; count < TMP_MAX; ++count) { | |
327 | uint64_t v = value; | |
328 | /* Fill in the random bits. */ | |
329 | template[0] = letters[v % num_letters]; v /= num_letters; | |
330 | template[1] = letters[v % num_letters]; v /= num_letters; | |
331 | template[2] = letters[v % num_letters]; v /= num_letters; | |
332 | template[3] = letters[v % num_letters]; v /= num_letters; | |
333 | template[4] = letters[v % num_letters]; v /= num_letters; | |
334 | template[5] = letters[v % num_letters]; v /= num_letters; | |
335 | ||
336 | fd = open(pattern, O_CREAT | O_EXCL | O_RDWR, mode); | |
a2cb86c1 | 337 | if (fd >= 0) |
33f23936 JN |
338 | return fd; |
339 | /* | |
340 | * Fatal error (EPERM, ENOSPC etc). | |
341 | * It doesn't make sense to loop. | |
342 | */ | |
343 | if (errno != EEXIST) | |
344 | break; | |
345 | /* | |
346 | * This is a random value. It is only necessary that | |
347 | * the next TMP_MAX values generated by adding 7777 to | |
348 | * VALUE are different with (module 2^32). | |
349 | */ | |
350 | value += 7777; | |
351 | } | |
352 | /* We return the null string if we can't find a unique file name. */ | |
353 | pattern[0] = '\0'; | |
354 | return -1; | |
355 | } | |
356 | ||
357 | int git_mkstemp_mode(char *pattern, int mode) | |
358 | { | |
359 | /* mkstemp is just mkstemps with no suffix */ | |
360 | return git_mkstemps_mode(pattern, 0, mode); | |
361 | } | |
362 | ||
ec145c9c | 363 | #ifdef NO_MKSTEMPS |
33f23936 JN |
364 | int gitmkstemps(char *pattern, int suffix_len) |
365 | { | |
366 | return git_mkstemps_mode(pattern, suffix_len, 0600); | |
367 | } | |
ec145c9c | 368 | #endif |
33f23936 | 369 | |
b862b61c MM |
370 | int xmkstemp_mode(char *template, int mode) |
371 | { | |
372 | int fd; | |
6cf6bb3e AE |
373 | char origtemplate[PATH_MAX]; |
374 | strlcpy(origtemplate, template, sizeof(origtemplate)); | |
b862b61c MM |
375 | |
376 | fd = git_mkstemp_mode(template, mode); | |
6cf6bb3e AE |
377 | if (fd < 0) { |
378 | int saved_errno = errno; | |
379 | const char *nonrelative_template; | |
380 | ||
381 | if (!template[0]) | |
382 | template = origtemplate; | |
383 | ||
e2a57aac | 384 | nonrelative_template = absolute_path(template); |
6cf6bb3e AE |
385 | errno = saved_errno; |
386 | die_errno("Unable to create temporary file '%s'", | |
387 | nonrelative_template); | |
388 | } | |
b862b61c MM |
389 | return fd; |
390 | } | |
391 | ||
10e13ec8 | 392 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 393 | { |
fc71db39 AR |
394 | if (rc < 0) { |
395 | int err = errno; | |
396 | if (ENOENT != err) { | |
10e13ec8 PC |
397 | warning("unable to %s %s: %s", |
398 | op, file, strerror(errno)); | |
fc71db39 AR |
399 | errno = err; |
400 | } | |
401 | } | |
402 | return rc; | |
403 | } | |
404 | ||
10e13ec8 PC |
405 | int unlink_or_warn(const char *file) |
406 | { | |
407 | return warn_if_unremovable("unlink", file, unlink(file)); | |
408 | } | |
d1723296 PC |
409 | |
410 | int rmdir_or_warn(const char *file) | |
411 | { | |
412 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
413 | } | |
80d706af PC |
414 | |
415 | int remove_or_warn(unsigned int mode, const char *file) | |
416 | { | |
417 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
418 | } | |
2f705875 | 419 | |
55b38a48 JH |
420 | void warn_on_inaccessible(const char *path) |
421 | { | |
422 | warning(_("unable to access '%s': %s"), path, strerror(errno)); | |
423 | } | |
424 | ||
4698c8fe JN |
425 | static int access_error_is_ok(int err, unsigned flag) |
426 | { | |
427 | return err == ENOENT || err == ENOTDIR || | |
428 | ((flag & ACCESS_EACCES_OK) && err == EACCES); | |
429 | } | |
430 | ||
431 | int access_or_warn(const char *path, int mode, unsigned flag) | |
ba8bd830 JK |
432 | { |
433 | int ret = access(path, mode); | |
4698c8fe | 434 | if (ret && !access_error_is_ok(errno, flag)) |
55b38a48 | 435 | warn_on_inaccessible(path); |
ba8bd830 JK |
436 | return ret; |
437 | } | |
438 | ||
4698c8fe | 439 | int access_or_die(const char *path, int mode, unsigned flag) |
96b9e0e3 JN |
440 | { |
441 | int ret = access(path, mode); | |
4698c8fe | 442 | if (ret && !access_error_is_ok(errno, flag)) |
96b9e0e3 JN |
443 | die_errno(_("unable to access '%s'"), path); |
444 | return ret; | |
445 | } | |
446 | ||
2f705875 JK |
447 | struct passwd *xgetpwuid_self(void) |
448 | { | |
449 | struct passwd *pw; | |
450 | ||
451 | errno = 0; | |
452 | pw = getpwuid(getuid()); | |
453 | if (!pw) | |
454 | die(_("unable to look up current user in the passwd file: %s"), | |
455 | errno ? strerror(errno) : _("no such user")); | |
456 | return pw; | |
457 | } |