Move gitmkstemps to path.c
[git/git.git] / wrapper.c
CommitLineData
112db553
LT
1/*
2 * Various trivial helper wrappers around standard functions
3 */
4#include "cache.h"
5
6char *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
18void *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
37void *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 */
53void *xmemdupz(const void *data, size_t len)
54{
5bf9219d 55 return memcpy(xmallocz(len), data, len);
112db553
LT
56}
57
58char *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
64void *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
80void *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
96void *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 */
116ssize_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 */
132ssize_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
143ssize_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
160ssize_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
181int 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
189FILE *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
197int 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 */
211void 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
231void git_inflate_end(z_streamp strm)
232{
233 if (inflateEnd(strm) != Z_OK)
234 error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
235}
236
237int 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
267int 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
285int 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
300int 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