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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 | ||
a9a74636 NP |
6 | static void try_to_free_builtin(size_t size) |
7 | { | |
8 | release_pack_memory(size, -1); | |
9 | } | |
10 | ||
11 | static void (*try_to_free_routine)(size_t size) = try_to_free_builtin; | |
12 | ||
851c34b0 | 13 | try_to_free_t set_try_to_free_routine(try_to_free_t routine) |
a9a74636 | 14 | { |
851c34b0 JS |
15 | try_to_free_t old = try_to_free_routine; |
16 | try_to_free_routine = routine; | |
17 | return old; | |
a9a74636 NP |
18 | } |
19 | ||
112db553 LT |
20 | char *xstrdup(const char *str) |
21 | { | |
22 | char *ret = strdup(str); | |
23 | if (!ret) { | |
a9a74636 | 24 | try_to_free_routine(strlen(str) + 1); |
112db553 LT |
25 | ret = strdup(str); |
26 | if (!ret) | |
27 | die("Out of memory, strdup failed"); | |
28 | } | |
29 | return ret; | |
30 | } | |
31 | ||
32 | void *xmalloc(size_t size) | |
33 | { | |
34 | void *ret = malloc(size); | |
35 | if (!ret && !size) | |
36 | ret = malloc(1); | |
37 | if (!ret) { | |
a9a74636 | 38 | try_to_free_routine(size); |
112db553 LT |
39 | ret = malloc(size); |
40 | if (!ret && !size) | |
41 | ret = malloc(1); | |
42 | if (!ret) | |
8bd9fd50 MM |
43 | die("Out of memory, malloc failed (tried to allocate %lu bytes)", |
44 | (unsigned long)size); | |
112db553 LT |
45 | } |
46 | #ifdef XMALLOC_POISON | |
47 | memset(ret, 0xA5, size); | |
48 | #endif | |
49 | return ret; | |
50 | } | |
51 | ||
5bf9219d IL |
52 | void *xmallocz(size_t size) |
53 | { | |
54 | void *ret; | |
55 | if (size + 1 < size) | |
56 | die("Data too large to fit into virtual memory space."); | |
57 | ret = xmalloc(size + 1); | |
58 | ((char*)ret)[size] = 0; | |
59 | return ret; | |
60 | } | |
61 | ||
112db553 LT |
62 | /* |
63 | * xmemdupz() allocates (len + 1) bytes of memory, duplicates "len" bytes of | |
64 | * "data" to the allocated memory, zero terminates the allocated memory, | |
65 | * and returns a pointer to the allocated memory. If the allocation fails, | |
66 | * the program dies. | |
67 | */ | |
68 | void *xmemdupz(const void *data, size_t len) | |
69 | { | |
5bf9219d | 70 | return memcpy(xmallocz(len), data, len); |
112db553 LT |
71 | } |
72 | ||
73 | char *xstrndup(const char *str, size_t len) | |
74 | { | |
75 | char *p = memchr(str, '\0', len); | |
76 | return xmemdupz(str, p ? p - str : len); | |
77 | } | |
78 | ||
79 | void *xrealloc(void *ptr, size_t size) | |
80 | { | |
81 | void *ret = realloc(ptr, size); | |
82 | if (!ret && !size) | |
83 | ret = realloc(ptr, 1); | |
84 | if (!ret) { | |
a9a74636 | 85 | try_to_free_routine(size); |
112db553 LT |
86 | ret = realloc(ptr, size); |
87 | if (!ret && !size) | |
88 | ret = realloc(ptr, 1); | |
89 | if (!ret) | |
90 | die("Out of memory, realloc failed"); | |
91 | } | |
92 | return ret; | |
93 | } | |
94 | ||
95 | void *xcalloc(size_t nmemb, size_t size) | |
96 | { | |
97 | void *ret = calloc(nmemb, size); | |
98 | if (!ret && (!nmemb || !size)) | |
99 | ret = calloc(1, 1); | |
100 | if (!ret) { | |
a9a74636 | 101 | try_to_free_routine(nmemb * size); |
112db553 LT |
102 | ret = calloc(nmemb, size); |
103 | if (!ret && (!nmemb || !size)) | |
104 | ret = calloc(1, 1); | |
105 | if (!ret) | |
106 | die("Out of memory, calloc failed"); | |
107 | } | |
108 | return ret; | |
109 | } | |
110 | ||
111 | void *xmmap(void *start, size_t length, | |
112 | int prot, int flags, int fd, off_t offset) | |
113 | { | |
114 | void *ret = mmap(start, length, prot, flags, fd, offset); | |
115 | if (ret == MAP_FAILED) { | |
116 | if (!length) | |
117 | return NULL; | |
118 | release_pack_memory(length, fd); | |
119 | ret = mmap(start, length, prot, flags, fd, offset); | |
120 | if (ret == MAP_FAILED) | |
d824cbba | 121 | die_errno("Out of memory? mmap failed"); |
112db553 LT |
122 | } |
123 | return ret; | |
124 | } | |
125 | ||
126 | /* | |
127 | * xread() is the same a read(), but it automatically restarts read() | |
128 | * operations with a recoverable error (EAGAIN and EINTR). xread() | |
129 | * DOES NOT GUARANTEE that "len" bytes is read even if the data is available. | |
130 | */ | |
131 | ssize_t xread(int fd, void *buf, size_t len) | |
132 | { | |
133 | ssize_t nr; | |
134 | while (1) { | |
135 | nr = read(fd, buf, len); | |
136 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
137 | continue; | |
138 | return nr; | |
139 | } | |
140 | } | |
141 | ||
142 | /* | |
143 | * xwrite() is the same a write(), but it automatically restarts write() | |
144 | * operations with a recoverable error (EAGAIN and EINTR). xwrite() DOES NOT | |
145 | * GUARANTEE that "len" bytes is written even if the operation is successful. | |
146 | */ | |
147 | ssize_t xwrite(int fd, const void *buf, size_t len) | |
148 | { | |
149 | ssize_t nr; | |
150 | while (1) { | |
151 | nr = write(fd, buf, len); | |
152 | if ((nr < 0) && (errno == EAGAIN || errno == EINTR)) | |
153 | continue; | |
154 | return nr; | |
155 | } | |
156 | } | |
157 | ||
559e840b JH |
158 | ssize_t read_in_full(int fd, void *buf, size_t count) |
159 | { | |
160 | char *p = buf; | |
161 | ssize_t total = 0; | |
162 | ||
163 | while (count > 0) { | |
164 | ssize_t loaded = xread(fd, p, count); | |
165 | if (loaded <= 0) | |
166 | return total ? total : loaded; | |
167 | count -= loaded; | |
168 | p += loaded; | |
169 | total += loaded; | |
170 | } | |
171 | ||
172 | return total; | |
173 | } | |
174 | ||
175 | ssize_t write_in_full(int fd, const void *buf, size_t count) | |
176 | { | |
177 | const char *p = buf; | |
178 | ssize_t total = 0; | |
179 | ||
180 | while (count > 0) { | |
181 | ssize_t written = xwrite(fd, p, count); | |
182 | if (written < 0) | |
183 | return -1; | |
184 | if (!written) { | |
185 | errno = ENOSPC; | |
186 | return -1; | |
187 | } | |
188 | count -= written; | |
189 | p += written; | |
190 | total += written; | |
191 | } | |
192 | ||
193 | return total; | |
194 | } | |
195 | ||
112db553 LT |
196 | int xdup(int fd) |
197 | { | |
198 | int ret = dup(fd); | |
199 | if (ret < 0) | |
d824cbba | 200 | die_errno("dup failed"); |
112db553 LT |
201 | return ret; |
202 | } | |
203 | ||
204 | FILE *xfdopen(int fd, const char *mode) | |
205 | { | |
206 | FILE *stream = fdopen(fd, mode); | |
207 | if (stream == NULL) | |
d824cbba | 208 | die_errno("Out of memory? fdopen failed"); |
112db553 LT |
209 | return stream; |
210 | } | |
211 | ||
212 | int xmkstemp(char *template) | |
213 | { | |
214 | int fd; | |
215 | ||
216 | fd = mkstemp(template); | |
217 | if (fd < 0) | |
d824cbba | 218 | die_errno("Unable to create temporary file"); |
112db553 LT |
219 | return fd; |
220 | } | |
39c68542 | 221 | |
b862b61c MM |
222 | int xmkstemp_mode(char *template, int mode) |
223 | { | |
224 | int fd; | |
225 | ||
226 | fd = git_mkstemp_mode(template, mode); | |
227 | if (fd < 0) | |
228 | die_errno("Unable to create temporary file"); | |
229 | return fd; | |
230 | } | |
231 | ||
39c68542 LT |
232 | /* |
233 | * zlib wrappers to make sure we don't silently miss errors | |
234 | * at init time. | |
235 | */ | |
236 | void git_inflate_init(z_streamp strm) | |
237 | { | |
238 | const char *err; | |
239 | ||
240 | switch (inflateInit(strm)) { | |
241 | case Z_OK: | |
242 | return; | |
243 | ||
244 | case Z_MEM_ERROR: | |
245 | err = "out of memory"; | |
246 | break; | |
247 | case Z_VERSION_ERROR: | |
248 | err = "wrong version"; | |
249 | break; | |
250 | default: | |
251 | err = "error"; | |
252 | } | |
253 | die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message"); | |
254 | } | |
255 | ||
256 | void git_inflate_end(z_streamp strm) | |
257 | { | |
258 | if (inflateEnd(strm) != Z_OK) | |
259 | error("inflateEnd: %s", strm->msg ? strm->msg : "failed"); | |
260 | } | |
261 | ||
262 | int git_inflate(z_streamp strm, int flush) | |
263 | { | |
264 | int ret = inflate(strm, flush); | |
265 | const char *err; | |
266 | ||
267 | switch (ret) { | |
268 | /* Out of memory is fatal. */ | |
269 | case Z_MEM_ERROR: | |
270 | die("inflate: out of memory"); | |
271 | ||
272 | /* Data corruption errors: we may want to recover from them (fsck) */ | |
273 | case Z_NEED_DICT: | |
274 | err = "needs dictionary"; break; | |
275 | case Z_DATA_ERROR: | |
276 | err = "data stream error"; break; | |
277 | case Z_STREAM_ERROR: | |
278 | err = "stream consistency error"; break; | |
279 | default: | |
280 | err = "unknown error"; break; | |
281 | ||
282 | /* Z_BUF_ERROR: normal, needs more space in the output buffer */ | |
283 | case Z_BUF_ERROR: | |
284 | case Z_OK: | |
285 | case Z_STREAM_END: | |
286 | return ret; | |
287 | } | |
288 | error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message"); | |
289 | return ret; | |
290 | } | |
bb0cebd7 | 291 | |
6e180cdc JH |
292 | int odb_mkstemp(char *template, size_t limit, const char *pattern) |
293 | { | |
294 | int fd; | |
f80c7ae8 MM |
295 | /* |
296 | * we let the umask do its job, don't try to be more | |
297 | * restrictive except to remove write permission. | |
298 | */ | |
299 | int mode = 0444; | |
6e180cdc JH |
300 | snprintf(template, limit, "%s/%s", |
301 | get_object_directory(), pattern); | |
f80c7ae8 | 302 | fd = git_mkstemp_mode(template, mode); |
6e180cdc JH |
303 | if (0 <= fd) |
304 | return fd; | |
305 | ||
306 | /* slow path */ | |
2c626e5f | 307 | /* some mkstemp implementations erase template on failure */ |
6e180cdc JH |
308 | snprintf(template, limit, "%s/%s", |
309 | get_object_directory(), pattern); | |
2c626e5f | 310 | safe_create_leading_directories(template); |
f80c7ae8 | 311 | return xmkstemp_mode(template, mode); |
6e180cdc JH |
312 | } |
313 | ||
314 | int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1) | |
315 | { | |
316 | int fd; | |
317 | ||
318 | snprintf(name, namesz, "%s/pack/pack-%s.keep", | |
319 | get_object_directory(), sha1_to_hex(sha1)); | |
320 | fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600); | |
321 | if (0 <= fd) | |
322 | return fd; | |
323 | ||
324 | /* slow path */ | |
325 | safe_create_leading_directories(name); | |
326 | return open(name, O_RDWR|O_CREAT|O_EXCL, 0600); | |
327 | } | |
fc71db39 | 328 | |
10e13ec8 | 329 | static int warn_if_unremovable(const char *op, const char *file, int rc) |
fc71db39 | 330 | { |
fc71db39 AR |
331 | if (rc < 0) { |
332 | int err = errno; | |
333 | if (ENOENT != err) { | |
10e13ec8 PC |
334 | warning("unable to %s %s: %s", |
335 | op, file, strerror(errno)); | |
fc71db39 AR |
336 | errno = err; |
337 | } | |
338 | } | |
339 | return rc; | |
340 | } | |
341 | ||
10e13ec8 PC |
342 | int unlink_or_warn(const char *file) |
343 | { | |
344 | return warn_if_unremovable("unlink", file, unlink(file)); | |
345 | } | |
d1723296 PC |
346 | |
347 | int rmdir_or_warn(const char *file) | |
348 | { | |
349 | return warn_if_unremovable("rmdir", file, rmdir(file)); | |
350 | } | |
80d706af PC |
351 | |
352 | int remove_or_warn(unsigned int mode, const char *file) | |
353 | { | |
354 | return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file); | |
355 | } |