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