url rewriting: take longest and first match
[git/peff.git] / git-compat-util.h
blob05146047e0f33476df963e0e5aef30dd02a249fc
1 #ifndef GIT_COMPAT_UTIL_H
2 #define GIT_COMPAT_UTIL_H
4 #define _FILE_OFFSET_BITS 64
6 #ifndef FLEX_ARRAY
7 /*
8 * See if our compiler is known to support flexible array members.
9 */
10 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
11 # define FLEX_ARRAY /* empty */
12 #elif defined(__GNUC__)
13 # if (__GNUC__ >= 3)
14 # define FLEX_ARRAY /* empty */
15 # else
16 # define FLEX_ARRAY 0 /* older GNU extension */
17 # endif
18 #endif
21 * Otherwise, default to safer but a bit wasteful traditional style
23 #ifndef FLEX_ARRAY
24 # define FLEX_ARRAY 1
25 #endif
26 #endif
28 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
30 #ifdef __GNUC__
31 #define TYPEOF(x) (__typeof__(x))
32 #else
33 #define TYPEOF(x)
34 #endif
36 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (sizeof(x) * 8 - (bits))))
37 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
39 /* Approximation of the length of the decimal representation of this type. */
40 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
42 #if !defined(__APPLE__) && !defined(__FreeBSD__)
43 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
44 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
45 #endif
46 #define _ALL_SOURCE 1
47 #define _GNU_SOURCE 1
48 #define _BSD_SOURCE 1
50 #include <unistd.h>
51 #include <stdio.h>
52 #include <sys/stat.h>
53 #include <fcntl.h>
54 #include <stddef.h>
55 #include <stdlib.h>
56 #include <stdarg.h>
57 #include <string.h>
58 #include <errno.h>
59 #include <limits.h>
60 #include <sys/param.h>
61 #include <sys/types.h>
62 #include <dirent.h>
63 #include <sys/time.h>
64 #include <time.h>
65 #include <signal.h>
66 #include <sys/wait.h>
67 #include <fnmatch.h>
68 #include <sys/poll.h>
69 #include <sys/socket.h>
70 #include <sys/ioctl.h>
71 #ifndef NO_SYS_SELECT_H
72 #include <sys/select.h>
73 #endif
74 #include <assert.h>
75 #include <regex.h>
76 #include <netinet/in.h>
77 #include <netinet/tcp.h>
78 #include <arpa/inet.h>
79 #include <netdb.h>
80 #include <pwd.h>
81 #include <inttypes.h>
82 #if defined(__CYGWIN__)
83 #undef _XOPEN_SOURCE
84 #include <grp.h>
85 #define _XOPEN_SOURCE 600
86 #else
87 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
88 #include <grp.h>
89 #define _ALL_SOURCE 1
90 #endif
92 #ifndef NO_ICONV
93 #include <iconv.h>
94 #endif
96 /* On most systems <limits.h> would have given us this, but
97 * not on some systems (e.g. GNU/Hurd).
99 #ifndef PATH_MAX
100 #define PATH_MAX 4096
101 #endif
103 #ifndef PRIuMAX
104 #define PRIuMAX "llu"
105 #endif
107 #ifdef __GNUC__
108 #define NORETURN __attribute__((__noreturn__))
109 #else
110 #define NORETURN
111 #ifndef __attribute__
112 #define __attribute__(x)
113 #endif
114 #endif
116 /* General helper functions */
117 extern void usage(const char *err) NORETURN;
118 extern void die(const char *err, ...) NORETURN __attribute__((format (printf, 1, 2)));
119 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
120 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
122 extern void set_usage_routine(void (*routine)(const char *err) NORETURN);
123 extern void set_die_routine(void (*routine)(const char *err, va_list params) NORETURN);
124 extern void set_error_routine(void (*routine)(const char *err, va_list params));
125 extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
127 extern int prefixcmp(const char *str, const char *prefix);
129 #ifdef NO_MMAP
131 #ifndef PROT_READ
132 #define PROT_READ 1
133 #define PROT_WRITE 2
134 #define MAP_PRIVATE 1
135 #define MAP_FAILED ((void*)-1)
136 #endif
138 #define mmap git_mmap
139 #define munmap git_munmap
140 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
141 extern int git_munmap(void *start, size_t length);
143 /* This value must be multiple of (pagesize * 2) */
144 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
146 #else /* NO_MMAP */
148 #include <sys/mman.h>
150 /* This value must be multiple of (pagesize * 2) */
151 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
152 (sizeof(void*) >= 8 \
153 ? 1 * 1024 * 1024 * 1024 \
154 : 32 * 1024 * 1024)
156 #endif /* NO_MMAP */
158 #define DEFAULT_PACKED_GIT_LIMIT \
159 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
161 #ifdef NO_PREAD
162 #define pread git_pread
163 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
164 #endif
166 #ifdef NO_SETENV
167 #define setenv gitsetenv
168 extern int gitsetenv(const char *, const char *, int);
169 #endif
171 #ifdef NO_MKDTEMP
172 #define mkdtemp gitmkdtemp
173 extern char *gitmkdtemp(char *);
174 #endif
176 #ifdef NO_UNSETENV
177 #define unsetenv gitunsetenv
178 extern void gitunsetenv(const char *);
179 #endif
181 #ifdef NO_STRCASESTR
182 #define strcasestr gitstrcasestr
183 extern char *gitstrcasestr(const char *haystack, const char *needle);
184 #endif
186 #ifdef NO_STRLCPY
187 #define strlcpy gitstrlcpy
188 extern size_t gitstrlcpy(char *, const char *, size_t);
189 #endif
191 #ifdef NO_STRTOUMAX
192 #define strtoumax gitstrtoumax
193 extern uintmax_t gitstrtoumax(const char *, char **, int);
194 #endif
196 #ifdef NO_HSTRERROR
197 #define hstrerror githstrerror
198 extern const char *githstrerror(int herror);
199 #endif
201 #ifdef NO_MEMMEM
202 #define memmem gitmemmem
203 void *gitmemmem(const void *haystack, size_t haystacklen,
204 const void *needle, size_t needlelen);
205 #endif
207 #ifdef __GLIBC_PREREQ
208 #if __GLIBC_PREREQ(2, 1)
209 #define HAVE_STRCHRNUL
210 #endif
211 #endif
213 #ifndef HAVE_STRCHRNUL
214 #define strchrnul gitstrchrnul
215 static inline char *gitstrchrnul(const char *s, int c)
217 while (*s && *s != c)
218 s++;
219 return (char *)s;
221 #endif
223 extern void release_pack_memory(size_t, int);
225 static inline char* xstrdup(const char *str)
227 char *ret = strdup(str);
228 if (!ret) {
229 release_pack_memory(strlen(str) + 1, -1);
230 ret = strdup(str);
231 if (!ret)
232 die("Out of memory, strdup failed");
234 return ret;
237 static inline void *xmalloc(size_t size)
239 void *ret = malloc(size);
240 if (!ret && !size)
241 ret = malloc(1);
242 if (!ret) {
243 release_pack_memory(size, -1);
244 ret = malloc(size);
245 if (!ret && !size)
246 ret = malloc(1);
247 if (!ret)
248 die("Out of memory, malloc failed");
250 #ifdef XMALLOC_POISON
251 memset(ret, 0xA5, size);
252 #endif
253 return ret;
256 static inline void *xmemdupz(const void *data, size_t len)
258 char *p = xmalloc(len + 1);
259 memcpy(p, data, len);
260 p[len] = '\0';
261 return p;
264 static inline char *xstrndup(const char *str, size_t len)
266 char *p = memchr(str, '\0', len);
267 return xmemdupz(str, p ? p - str : len);
270 static inline void *xrealloc(void *ptr, size_t size)
272 void *ret = realloc(ptr, size);
273 if (!ret && !size)
274 ret = realloc(ptr, 1);
275 if (!ret) {
276 release_pack_memory(size, -1);
277 ret = realloc(ptr, size);
278 if (!ret && !size)
279 ret = realloc(ptr, 1);
280 if (!ret)
281 die("Out of memory, realloc failed");
283 return ret;
286 static inline void *xcalloc(size_t nmemb, size_t size)
288 void *ret = calloc(nmemb, size);
289 if (!ret && (!nmemb || !size))
290 ret = calloc(1, 1);
291 if (!ret) {
292 release_pack_memory(nmemb * size, -1);
293 ret = calloc(nmemb, size);
294 if (!ret && (!nmemb || !size))
295 ret = calloc(1, 1);
296 if (!ret)
297 die("Out of memory, calloc failed");
299 return ret;
302 static inline void *xmmap(void *start, size_t length,
303 int prot, int flags, int fd, off_t offset)
305 void *ret = mmap(start, length, prot, flags, fd, offset);
306 if (ret == MAP_FAILED) {
307 if (!length)
308 return NULL;
309 release_pack_memory(length, fd);
310 ret = mmap(start, length, prot, flags, fd, offset);
311 if (ret == MAP_FAILED)
312 die("Out of memory? mmap failed: %s", strerror(errno));
314 return ret;
317 static inline ssize_t xread(int fd, void *buf, size_t len)
319 ssize_t nr;
320 while (1) {
321 nr = read(fd, buf, len);
322 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
323 continue;
324 return nr;
328 static inline ssize_t xwrite(int fd, const void *buf, size_t len)
330 ssize_t nr;
331 while (1) {
332 nr = write(fd, buf, len);
333 if ((nr < 0) && (errno == EAGAIN || errno == EINTR))
334 continue;
335 return nr;
339 static inline int xdup(int fd)
341 int ret = dup(fd);
342 if (ret < 0)
343 die("dup failed: %s", strerror(errno));
344 return ret;
347 static inline FILE *xfdopen(int fd, const char *mode)
349 FILE *stream = fdopen(fd, mode);
350 if (stream == NULL)
351 die("Out of memory? fdopen failed: %s", strerror(errno));
352 return stream;
355 static inline int xmkstemp(char *template)
357 int fd;
359 fd = mkstemp(template);
360 if (fd < 0)
361 die("Unable to create temporary file: %s", strerror(errno));
362 return fd;
365 static inline size_t xsize_t(off_t len)
367 return (size_t)len;
370 static inline int has_extension(const char *filename, const char *ext)
372 size_t len = strlen(filename);
373 size_t extlen = strlen(ext);
374 return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
377 /* Sane ctype - no locale, and works with signed chars */
378 #undef isspace
379 #undef isdigit
380 #undef isalpha
381 #undef isalnum
382 #undef tolower
383 #undef toupper
384 extern unsigned char sane_ctype[256];
385 #define GIT_SPACE 0x01
386 #define GIT_DIGIT 0x02
387 #define GIT_ALPHA 0x04
388 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
389 #define isspace(x) sane_istest(x,GIT_SPACE)
390 #define isdigit(x) sane_istest(x,GIT_DIGIT)
391 #define isalpha(x) sane_istest(x,GIT_ALPHA)
392 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
393 #define tolower(x) sane_case((unsigned char)(x), 0x20)
394 #define toupper(x) sane_case((unsigned char)(x), 0)
396 static inline int sane_case(int x, int high)
398 if (sane_istest(x, GIT_ALPHA))
399 x = (x & ~0x20) | high;
400 return x;
403 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
405 unsigned long ul;
406 char *p;
408 errno = 0;
409 ul = strtoul(s, &p, base);
410 if (errno || *p || p == s || (unsigned int) ul != ul)
411 return -1;
412 *result = ul;
413 return 0;
416 static inline int strtol_i(char const *s, int base, int *result)
418 long ul;
419 char *p;
421 errno = 0;
422 ul = strtol(s, &p, base);
423 if (errno || *p || p == s || (int) ul != ul)
424 return -1;
425 *result = ul;
426 return 0;
429 #ifdef INTERNAL_QSORT
430 void git_qsort(void *base, size_t nmemb, size_t size,
431 int(*compar)(const void *, const void *));
432 #define qsort git_qsort
433 #endif
435 #endif