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