gitk: Second try to work around the command line limit on Windows
[git/dscho.git] / wrapper.c
blob10a6750795b287beabd50561402ffa8867f3e283
1 /*
2 * Various trivial helper wrappers around standard functions
3 */
4 #include "cache.h"
6 char *xstrdup(const char *str)
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");
15 return ret;
18 void *xmalloc(size_t size)
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");
31 #ifdef XMALLOC_POISON
32 memset(ret, 0xA5, size);
33 #endif
34 return ret;
37 void *xmallocz(size_t size)
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;
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.
53 void *xmemdupz(const void *data, size_t len)
55 return memcpy(xmallocz(len), data, len);
58 char *xstrndup(const char *str, size_t len)
60 char *p = memchr(str, '\0', len);
61 return xmemdupz(str, p ? p - str : len);
64 void *xrealloc(void *ptr, size_t size)
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");
77 return ret;
80 void *xcalloc(size_t nmemb, size_t size)
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");
93 return ret;
96 void *xmmap(void *start, size_t length,
97 int prot, int flags, int fd, off_t offset)
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)
106 die_errno("Out of memory? mmap failed");
108 return ret;
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.
116 ssize_t xread(int fd, void *buf, size_t len)
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;
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.
132 ssize_t xwrite(int fd, const void *buf, size_t len)
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;
143 ssize_t read_in_full(int fd, void *buf, size_t count)
145 char *p = buf;
146 ssize_t total = 0;
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;
157 return total;
160 ssize_t write_in_full(int fd, const void *buf, size_t count)
162 const char *p = buf;
163 ssize_t total = 0;
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;
173 count -= written;
174 p += written;
175 total += written;
178 return total;
181 int xdup(int fd)
183 int ret = dup(fd);
184 if (ret < 0)
185 die_errno("dup failed");
186 return ret;
189 FILE *xfdopen(int fd, const char *mode)
191 FILE *stream = fdopen(fd, mode);
192 if (stream == NULL)
193 die_errno("Out of memory? fdopen failed");
194 return stream;
197 int xmkstemp(char *template)
199 int fd;
201 fd = mkstemp(template);
202 if (fd < 0)
203 die_errno("Unable to create temporary file");
204 return fd;
207 int xmkstemp_mode(char *template, int mode)
209 int fd;
211 fd = git_mkstemp_mode(template, mode);
212 if (fd < 0)
213 die_errno("Unable to create temporary file");
214 return fd;
218 * zlib wrappers to make sure we don't silently miss errors
219 * at init time.
221 void git_inflate_init(z_streamp strm)
223 const char *err;
225 switch (inflateInit(strm)) {
226 case Z_OK:
227 return;
229 case Z_MEM_ERROR:
230 err = "out of memory";
231 break;
232 case Z_VERSION_ERROR:
233 err = "wrong version";
234 break;
235 default:
236 err = "error";
238 die("inflateInit: %s (%s)", err, strm->msg ? strm->msg : "no message");
241 void git_inflate_end(z_streamp strm)
243 if (inflateEnd(strm) != Z_OK)
244 error("inflateEnd: %s", strm->msg ? strm->msg : "failed");
247 int git_inflate(z_streamp strm, int flush)
249 int ret = inflate(strm, flush);
250 const char *err;
252 switch (ret) {
253 /* Out of memory is fatal. */
254 case Z_MEM_ERROR:
255 die("inflate: out of memory");
257 /* Data corruption errors: we may want to recover from them (fsck) */
258 case Z_NEED_DICT:
259 err = "needs dictionary"; break;
260 case Z_DATA_ERROR:
261 err = "data stream error"; break;
262 case Z_STREAM_ERROR:
263 err = "stream consistency error"; break;
264 default:
265 err = "unknown error"; break;
267 /* Z_BUF_ERROR: normal, needs more space in the output buffer */
268 case Z_BUF_ERROR:
269 case Z_OK:
270 case Z_STREAM_END:
271 return ret;
273 error("inflate: %s (%s)", err, strm->msg ? strm->msg : "no message");
274 return ret;
277 int odb_mkstemp(char *template, size_t limit, const char *pattern)
279 int fd;
281 * we let the umask do its job, don't try to be more
282 * restrictive except to remove write permission.
284 int mode = 0444;
285 snprintf(template, limit, "%s/%s",
286 get_object_directory(), pattern);
287 fd = git_mkstemp_mode(template, mode);
288 if (0 <= fd)
289 return fd;
291 /* slow path */
292 /* some mkstemp implementations erase template on failure */
293 snprintf(template, limit, "%s/%s",
294 get_object_directory(), pattern);
295 safe_create_leading_directories(template);
296 return xmkstemp_mode(template, mode);
299 int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1)
301 int fd;
303 snprintf(name, namesz, "%s/pack/pack-%s.keep",
304 get_object_directory(), sha1_to_hex(sha1));
305 fd = open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
306 if (0 <= fd)
307 return fd;
309 /* slow path */
310 safe_create_leading_directories(name);
311 return open(name, O_RDWR|O_CREAT|O_EXCL, 0600);
314 static int warn_if_unremovable(const char *op, const char *file, int rc)
316 if (rc < 0) {
317 int err = errno;
318 if (ENOENT != err) {
319 warning("unable to %s %s: %s",
320 op, file, strerror(errno));
321 errno = err;
324 return rc;
327 int unlink_or_warn(const char *file)
329 return warn_if_unremovable("unlink", file, unlink(file));
332 int rmdir_or_warn(const char *file)
334 return warn_if_unremovable("rmdir", file, rmdir(file));
337 int remove_or_warn(unsigned int mode, const char *file)
339 return S_ISGITLINK(mode) ? rmdir_or_warn(file) : unlink_or_warn(file);