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