Sync with maint
[git.git] / git-compat-util.h
blob26e92f19cf6c82cfd55fcc7ba6de244c82c557c5
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) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
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]))
29 #define bitsizeof(x) (CHAR_BIT * sizeof(x))
31 #define maximum_signed_value_of_type(a) \
32 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
34 #define maximum_unsigned_value_of_type(a) \
35 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
38 * Signed integer overflow is undefined in C, so here's a helper macro
39 * to detect if the sum of two integers will overflow.
41 * Requires: a >= 0, typeof(a) equals typeof(b)
43 #define signed_add_overflows(a, b) \
44 ((b) > maximum_signed_value_of_type(a) - (a))
46 #define unsigned_add_overflows(a, b) \
47 ((b) > maximum_unsigned_value_of_type(a) - (a))
49 #ifdef __GNUC__
50 #define TYPEOF(x) (__typeof__(x))
51 #else
52 #define TYPEOF(x)
53 #endif
55 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
56 #define HAS_MULTI_BITS(i) ((i) & ((i) - 1)) /* checks if an integer has more than 1 bit set */
58 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
60 /* Approximation of the length of the decimal representation of this type. */
61 #define decimal_length(x) ((int)(sizeof(x) * 2.56 + 0.5) + 1)
63 #if defined(__sun__)
65 * On Solaris, when _XOPEN_EXTENDED is set, its header file
66 * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
67 * setting to say we are XPG5 or XPG6. Also on Solaris,
68 * XPG6 programs must be compiled with a c99 compiler, while
69 * non XPG6 programs must be compiled with a pre-c99 compiler.
71 # if __STDC_VERSION__ - 0 >= 199901L
72 # define _XOPEN_SOURCE 600
73 # else
74 # define _XOPEN_SOURCE 500
75 # endif
76 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
77 !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
78 !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__)
79 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
80 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
81 #endif
82 #define _ALL_SOURCE 1
83 #define _GNU_SOURCE 1
84 #define _BSD_SOURCE 1
85 #define _NETBSD_SOURCE 1
86 #define _SGI_SOURCE 1
88 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
89 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
90 # define _WIN32_WINNT 0x0502
91 # endif
92 #define WIN32_LEAN_AND_MEAN /* stops windows.h including winsock.h */
93 #include <winsock2.h>
94 #include <windows.h>
95 #define GIT_WINDOWS_NATIVE
96 #endif
98 #include <unistd.h>
99 #include <stdio.h>
100 #include <sys/stat.h>
101 #include <fcntl.h>
102 #include <stddef.h>
103 #include <stdlib.h>
104 #include <stdarg.h>
105 #include <string.h>
106 #ifdef HAVE_STRINGS_H
107 #include <strings.h> /* for strcasecmp() */
108 #endif
109 #include <errno.h>
110 #include <limits.h>
111 #ifdef NEEDS_SYS_PARAM_H
112 #include <sys/param.h>
113 #endif
114 #include <sys/types.h>
115 #include <dirent.h>
116 #include <sys/time.h>
117 #include <time.h>
118 #include <signal.h>
119 #include <assert.h>
120 #include <regex.h>
121 #include <utime.h>
122 #include <syslog.h>
123 #ifndef NO_SYS_POLL_H
124 #include <sys/poll.h>
125 #else
126 #include <poll.h>
127 #endif
129 #if defined(__MINGW32__)
130 /* pull in Windows compatibility stuff */
131 #include "compat/mingw.h"
132 #elif defined(_MSC_VER)
133 #include "compat/msvc.h"
134 #else
135 #include <sys/wait.h>
136 #include <sys/resource.h>
137 #include <sys/socket.h>
138 #include <sys/ioctl.h>
139 #include <termios.h>
140 #ifndef NO_SYS_SELECT_H
141 #include <sys/select.h>
142 #endif
143 #include <netinet/in.h>
144 #include <netinet/tcp.h>
145 #include <arpa/inet.h>
146 #include <netdb.h>
147 #include <pwd.h>
148 #include <sys/un.h>
149 #ifndef NO_INTTYPES_H
150 #include <inttypes.h>
151 #else
152 #include <stdint.h>
153 #endif
154 #ifdef NO_INTPTR_T
156 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
157 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
158 * while on IP16 and IP16L32 it is "int" (resp. "short")
159 * Size needs to match (or exceed) 'sizeof(void *)'.
160 * We can't take "long long" here as not everybody has it.
162 typedef long intptr_t;
163 typedef unsigned long uintptr_t;
164 #endif
165 #if defined(__CYGWIN__)
166 #undef _XOPEN_SOURCE
167 #include <grp.h>
168 #define _XOPEN_SOURCE 600
169 #else
170 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
171 #include <grp.h>
172 #define _ALL_SOURCE 1
173 #endif
174 #endif
176 /* used on Mac OS X */
177 #ifdef PRECOMPOSE_UNICODE
178 #include "compat/precompose_utf8.h"
179 #else
180 #define precompose_str(in,i_nfd2nfc)
181 #define precompose_argv(c,v)
182 #define probe_utf8_pathname_composition(a,b)
183 #endif
185 #ifdef MKDIR_WO_TRAILING_SLASH
186 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
187 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
188 #endif
190 #ifdef NO_STRUCT_ITIMERVAL
191 struct itimerval {
192 struct timeval it_interval;
193 struct timeval it_value;
195 #endif
197 #ifdef NO_SETITIMER
198 #define setitimer(which,value,ovalue)
199 #endif
201 #ifndef NO_LIBGEN_H
202 #include <libgen.h>
203 #else
204 #define basename gitbasename
205 extern char *gitbasename(char *);
206 #endif
208 #ifndef NO_ICONV
209 #include <iconv.h>
210 #endif
212 #ifndef NO_OPENSSL
213 #include <openssl/ssl.h>
214 #include <openssl/err.h>
215 #endif
217 /* On most systems <netdb.h> would have given us this, but
218 * not on some systems (e.g. z/OS).
220 #ifndef NI_MAXHOST
221 #define NI_MAXHOST 1025
222 #endif
224 #ifndef NI_MAXSERV
225 #define NI_MAXSERV 32
226 #endif
228 /* On most systems <limits.h> would have given us this, but
229 * not on some systems (e.g. GNU/Hurd).
231 #ifndef PATH_MAX
232 #define PATH_MAX 4096
233 #endif
235 #ifndef PRIuMAX
236 #define PRIuMAX "llu"
237 #endif
239 #ifndef PRIu32
240 #define PRIu32 "u"
241 #endif
243 #ifndef PRIx32
244 #define PRIx32 "x"
245 #endif
247 #ifndef PRIo32
248 #define PRIo32 "o"
249 #endif
251 #ifndef PATH_SEP
252 #define PATH_SEP ':'
253 #endif
255 #ifdef HAVE_PATHS_H
256 #include <paths.h>
257 #endif
258 #ifndef _PATH_DEFPATH
259 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
260 #endif
262 #ifndef STRIP_EXTENSION
263 #define STRIP_EXTENSION ""
264 #endif
266 #ifndef has_dos_drive_prefix
267 #define has_dos_drive_prefix(path) 0
268 #endif
270 #ifndef offset_1st_component
271 #define offset_1st_component(path) (is_dir_sep((path)[0]))
272 #endif
274 #ifndef is_dir_sep
275 #define is_dir_sep(c) ((c) == '/')
276 #endif
278 #ifndef find_last_dir_sep
279 #define find_last_dir_sep(path) strrchr(path, '/')
280 #endif
282 #if defined(__HP_cc) && (__HP_cc >= 61000)
283 #define NORETURN __attribute__((noreturn))
284 #define NORETURN_PTR
285 #elif defined(__GNUC__) && !defined(NO_NORETURN)
286 #define NORETURN __attribute__((__noreturn__))
287 #define NORETURN_PTR __attribute__((__noreturn__))
288 #elif defined(_MSC_VER)
289 #define NORETURN __declspec(noreturn)
290 #define NORETURN_PTR
291 #else
292 #define NORETURN
293 #define NORETURN_PTR
294 #ifndef __GNUC__
295 #ifndef __attribute__
296 #define __attribute__(x)
297 #endif
298 #endif
299 #endif
301 /* The sentinel attribute is valid from gcc version 4.0 */
302 #if defined(__GNUC__) && (__GNUC__ >= 4)
303 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
304 #else
305 #define LAST_ARG_MUST_BE_NULL
306 #endif
308 #include "compat/bswap.h"
310 #include "wildmatch.h"
312 /* General helper functions */
313 extern void vreportf(const char *prefix, const char *err, va_list params);
314 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
315 extern NORETURN void usage(const char *err);
316 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
317 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
318 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
319 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
320 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
322 #ifndef NO_OPENSSL
323 #ifdef APPLE_COMMON_CRYPTO
324 #include "compat/apple-common-crypto.h"
325 #else
326 #include <openssl/evp.h>
327 #include <openssl/hmac.h>
328 #endif /* APPLE_COMMON_CRYPTO */
329 #include <openssl/x509v3.h>
330 #endif /* NO_OPENSSL */
333 * Let callers be aware of the constant return value; this can help
334 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
335 * because some compilers may not support variadic macros. Since we're only
336 * trying to help gcc, anyway, it's OK; other compilers will fall back to
337 * using the function as usual.
339 #if defined(__GNUC__)
340 static inline int const_error(void)
342 return -1;
344 #define error(...) (error(__VA_ARGS__), const_error())
345 #endif
347 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
348 extern void set_error_routine(void (*routine)(const char *err, va_list params));
349 extern void set_die_is_recursing_routine(int (*routine)(void));
351 extern int starts_with(const char *str, const char *prefix);
354 * If the string "str" begins with the string found in "prefix", return 1.
355 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
356 * the string right after the prefix).
358 * Otherwise, return 0 and leave "out" untouched.
360 * Examples:
362 * [extract branch name, fail if not a branch]
363 * if (!skip_prefix(ref, "refs/heads/", &branch)
364 * return -1;
366 * [skip prefix if present, otherwise use whole string]
367 * skip_prefix(name, "refs/heads/", &name);
369 static inline int skip_prefix(const char *str, const char *prefix,
370 const char **out)
372 do {
373 if (!*prefix) {
374 *out = str;
375 return 1;
377 } while (*str++ == *prefix++);
378 return 0;
382 * If buf ends with suffix, return 1 and subtract the length of the suffix
383 * from *len. Otherwise, return 0 and leave *len untouched.
385 static inline int strip_suffix_mem(const char *buf, size_t *len,
386 const char *suffix)
388 size_t suflen = strlen(suffix);
389 if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
390 return 0;
391 *len -= suflen;
392 return 1;
396 * If str ends with suffix, return 1 and set *len to the size of the string
397 * without the suffix. Otherwise, return 0 and set *len to the size of the
398 * string.
400 * Note that we do _not_ NUL-terminate str to the new length.
402 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
404 *len = strlen(str);
405 return strip_suffix_mem(str, len, suffix);
408 static inline int ends_with(const char *str, const char *suffix)
410 size_t len;
411 return strip_suffix(str, suffix, &len);
414 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
416 #ifndef PROT_READ
417 #define PROT_READ 1
418 #define PROT_WRITE 2
419 #define MAP_PRIVATE 1
420 #endif
422 #define mmap git_mmap
423 #define munmap git_munmap
424 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
425 extern int git_munmap(void *start, size_t length);
427 #else /* NO_MMAP || USE_WIN32_MMAP */
429 #include <sys/mman.h>
431 #endif /* NO_MMAP || USE_WIN32_MMAP */
433 #ifdef NO_MMAP
435 /* This value must be multiple of (pagesize * 2) */
436 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
438 #else /* NO_MMAP */
440 /* This value must be multiple of (pagesize * 2) */
441 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
442 (sizeof(void*) >= 8 \
443 ? 1 * 1024 * 1024 * 1024 \
444 : 32 * 1024 * 1024)
446 #endif /* NO_MMAP */
448 #ifndef MAP_FAILED
449 #define MAP_FAILED ((void *)-1)
450 #endif
452 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
453 #define on_disk_bytes(st) ((st).st_size)
454 #else
455 #define on_disk_bytes(st) ((st).st_blocks * 512)
456 #endif
458 #define DEFAULT_PACKED_GIT_LIMIT \
459 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
461 #ifdef NO_PREAD
462 #define pread git_pread
463 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
464 #endif
466 * Forward decl that will remind us if its twin in cache.h changes.
467 * This function is used in compat/pread.c. But we can't include
468 * cache.h there.
470 extern ssize_t read_in_full(int fd, void *buf, size_t count);
472 #ifdef NO_SETENV
473 #define setenv gitsetenv
474 extern int gitsetenv(const char *, const char *, int);
475 #endif
477 #ifdef NO_MKDTEMP
478 #define mkdtemp gitmkdtemp
479 extern char *gitmkdtemp(char *);
480 #endif
482 #ifdef NO_MKSTEMPS
483 #define mkstemps gitmkstemps
484 extern int gitmkstemps(char *, int);
485 #endif
487 #ifdef NO_UNSETENV
488 #define unsetenv gitunsetenv
489 extern void gitunsetenv(const char *);
490 #endif
492 #ifdef NO_STRCASESTR
493 #define strcasestr gitstrcasestr
494 extern char *gitstrcasestr(const char *haystack, const char *needle);
495 #endif
497 #ifdef NO_STRLCPY
498 #define strlcpy gitstrlcpy
499 extern size_t gitstrlcpy(char *, const char *, size_t);
500 #endif
502 #ifdef NO_STRTOUMAX
503 #define strtoumax gitstrtoumax
504 extern uintmax_t gitstrtoumax(const char *, char **, int);
505 #define strtoimax gitstrtoimax
506 extern intmax_t gitstrtoimax(const char *, char **, int);
507 #endif
509 #ifdef NO_HSTRERROR
510 #define hstrerror githstrerror
511 extern const char *githstrerror(int herror);
512 #endif
514 #ifdef NO_MEMMEM
515 #define memmem gitmemmem
516 void *gitmemmem(const void *haystack, size_t haystacklen,
517 const void *needle, size_t needlelen);
518 #endif
520 #ifdef NO_GETPAGESIZE
521 #define getpagesize() sysconf(_SC_PAGESIZE)
522 #endif
524 #ifdef FREAD_READS_DIRECTORIES
525 #ifdef fopen
526 #undef fopen
527 #endif
528 #define fopen(a,b) git_fopen(a,b)
529 extern FILE *git_fopen(const char*, const char*);
530 #endif
532 #ifdef SNPRINTF_RETURNS_BOGUS
533 #ifdef snprintf
534 #undef snprintf
535 #endif
536 #define snprintf git_snprintf
537 extern int git_snprintf(char *str, size_t maxsize,
538 const char *format, ...);
539 #ifdef vsnprintf
540 #undef vsnprintf
541 #endif
542 #define vsnprintf git_vsnprintf
543 extern int git_vsnprintf(char *str, size_t maxsize,
544 const char *format, va_list ap);
545 #endif
547 #ifdef __GLIBC_PREREQ
548 #if __GLIBC_PREREQ(2, 1)
549 #define HAVE_STRCHRNUL
550 #define HAVE_MEMPCPY
551 #endif
552 #endif
554 #ifndef HAVE_STRCHRNUL
555 #define strchrnul gitstrchrnul
556 static inline char *gitstrchrnul(const char *s, int c)
558 while (*s && *s != c)
559 s++;
560 return (char *)s;
562 #endif
564 #ifndef HAVE_MEMPCPY
565 #define mempcpy gitmempcpy
566 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
568 return (char *)memcpy(dest, src, n) + n;
570 #endif
572 #ifdef NO_INET_PTON
573 int inet_pton(int af, const char *src, void *dst);
574 #endif
576 #ifdef NO_INET_NTOP
577 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
578 #endif
580 extern void release_pack_memory(size_t);
582 typedef void (*try_to_free_t)(size_t);
583 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
585 #ifdef HAVE_ALLOCA_H
586 # include <alloca.h>
587 # define xalloca(size) (alloca(size))
588 # define xalloca_free(p) do {} while (0)
589 #else
590 # define xalloca(size) (xmalloc(size))
591 # define xalloca_free(p) (free(p))
592 #endif
593 extern char *xstrdup(const char *str);
594 extern void *xmalloc(size_t size);
595 extern void *xmallocz(size_t size);
596 extern void *xmemdupz(const void *data, size_t len);
597 extern char *xstrndup(const char *str, size_t len);
598 extern void *xrealloc(void *ptr, size_t size);
599 extern void *xcalloc(size_t nmemb, size_t size);
600 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
601 extern ssize_t xread(int fd, void *buf, size_t len);
602 extern ssize_t xwrite(int fd, const void *buf, size_t len);
603 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
604 extern int xdup(int fd);
605 extern FILE *xfdopen(int fd, const char *mode);
606 extern int xmkstemp(char *template);
607 extern int xmkstemp_mode(char *template, int mode);
608 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
609 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
611 static inline size_t xsize_t(off_t len)
613 if (len > (size_t) len)
614 die("Cannot handle files this big");
615 return (size_t)len;
618 /* in ctype.c, for kwset users */
619 extern const char tolower_trans_tbl[256];
621 /* Sane ctype - no locale, and works with signed chars */
622 #undef isascii
623 #undef isspace
624 #undef isdigit
625 #undef isalpha
626 #undef isalnum
627 #undef isprint
628 #undef islower
629 #undef isupper
630 #undef tolower
631 #undef toupper
632 #undef iscntrl
633 #undef ispunct
634 #undef isxdigit
636 extern const unsigned char sane_ctype[256];
637 #define GIT_SPACE 0x01
638 #define GIT_DIGIT 0x02
639 #define GIT_ALPHA 0x04
640 #define GIT_GLOB_SPECIAL 0x08
641 #define GIT_REGEX_SPECIAL 0x10
642 #define GIT_PATHSPEC_MAGIC 0x20
643 #define GIT_CNTRL 0x40
644 #define GIT_PUNCT 0x80
645 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
646 #define isascii(x) (((x) & ~0x7f) == 0)
647 #define isspace(x) sane_istest(x,GIT_SPACE)
648 #define isdigit(x) sane_istest(x,GIT_DIGIT)
649 #define isalpha(x) sane_istest(x,GIT_ALPHA)
650 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
651 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
652 #define islower(x) sane_iscase(x, 1)
653 #define isupper(x) sane_iscase(x, 0)
654 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
655 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
656 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
657 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
658 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
659 #define isxdigit(x) (hexval_table[x] != -1)
660 #define tolower(x) sane_case((unsigned char)(x), 0x20)
661 #define toupper(x) sane_case((unsigned char)(x), 0)
662 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
664 static inline int sane_case(int x, int high)
666 if (sane_istest(x, GIT_ALPHA))
667 x = (x & ~0x20) | high;
668 return x;
671 static inline int sane_iscase(int x, int is_lower)
673 if (!sane_istest(x, GIT_ALPHA))
674 return 0;
676 if (is_lower)
677 return (x & 0x20) != 0;
678 else
679 return (x & 0x20) == 0;
682 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
684 unsigned long ul;
685 char *p;
687 errno = 0;
688 ul = strtoul(s, &p, base);
689 if (errno || *p || p == s || (unsigned int) ul != ul)
690 return -1;
691 *result = ul;
692 return 0;
695 static inline int strtol_i(char const *s, int base, int *result)
697 long ul;
698 char *p;
700 errno = 0;
701 ul = strtol(s, &p, base);
702 if (errno || *p || p == s || (int) ul != ul)
703 return -1;
704 *result = ul;
705 return 0;
708 #ifdef INTERNAL_QSORT
709 void git_qsort(void *base, size_t nmemb, size_t size,
710 int(*compar)(const void *, const void *));
711 #define qsort git_qsort
712 #endif
714 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
715 # define FORCE_DIR_SET_GID S_ISGID
716 #else
717 # define FORCE_DIR_SET_GID 0
718 #endif
720 #ifdef NO_NSEC
721 #undef USE_NSEC
722 #define ST_CTIME_NSEC(st) 0
723 #define ST_MTIME_NSEC(st) 0
724 #else
725 #ifdef USE_ST_TIMESPEC
726 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
727 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
728 #else
729 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
730 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
731 #endif
732 #endif
734 #if defined(__GNUC__) && defined(__x86_64__)
735 #include <emmintrin.h>
737 * This is the system memory page size; it's used so that we can read
738 * outside the bounds of an allocation without segfaulting.
740 #ifndef PAGE_SIZE
741 #define PAGE_SIZE 4096
742 #endif
743 #endif
745 #ifdef UNRELIABLE_FSTAT
746 #define fstat_is_reliable() 0
747 #else
748 #define fstat_is_reliable() 1
749 #endif
751 #ifndef va_copy
753 * Since an obvious implementation of va_list would be to make it a
754 * pointer into the stack frame, a simple assignment will work on
755 * many systems. But let's try to be more portable.
757 #ifdef __va_copy
758 #define va_copy(dst, src) __va_copy(dst, src)
759 #else
760 #define va_copy(dst, src) ((dst) = (src))
761 #endif
762 #endif
764 #if defined(__GNUC__) || (_MSC_VER >= 1400)
765 #define HAVE_VARIADIC_MACROS 1
766 #endif
769 * Preserves errno, prints a message, but gives no warning for ENOENT.
770 * Always returns the return value of unlink(2).
772 int unlink_or_warn(const char *path);
774 * Likewise for rmdir(2).
776 int rmdir_or_warn(const char *path);
778 * Calls the correct function out of {unlink,rmdir}_or_warn based on
779 * the supplied file mode.
781 int remove_or_warn(unsigned int mode, const char *path);
784 * Call access(2), but warn for any error except "missing file"
785 * (ENOENT or ENOTDIR).
787 #define ACCESS_EACCES_OK (1U << 0)
788 int access_or_warn(const char *path, int mode, unsigned flag);
789 int access_or_die(const char *path, int mode, unsigned flag);
791 /* Warn on an inaccessible file that ought to be accessible */
792 void warn_on_inaccessible(const char *path);
794 /* Get the passwd entry for the UID of the current process. */
795 struct passwd *xgetpwuid_self(void);
797 #ifdef GMTIME_UNRELIABLE_ERRORS
798 struct tm *git_gmtime(const time_t *);
799 struct tm *git_gmtime_r(const time_t *, struct tm *);
800 #define gmtime git_gmtime
801 #define gmtime_r git_gmtime_r
802 #endif
804 #endif