1#ifndef GIT_COMPAT_UTIL_H
2#define GIT_COMPAT_UTIL_H
3
4#define _FILE_OFFSET_BITS 64
5
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
19
20/*
21 * Otherwise, default to safer but a bit wasteful traditional style
22 */
23#ifndef FLEX_ARRAY
24# define FLEX_ARRAY 1
25#endif
26#endif
27
28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
29#define bitsizeof(x) (CHAR_BIT * sizeof(x))
30
31#define maximum_signed_value_of_type(a) \
32 (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
33
34#define maximum_unsigned_value_of_type(a) \
35 (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
36
37/*
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.
40 *
41 * Requires: a >= 0, typeof(a) equals typeof(b)
42 */
43#define signed_add_overflows(a, b) \
44 ((b) > maximum_signed_value_of_type(a) - (a))
45
46#define unsigned_add_overflows(a, b) \
47 ((b) > maximum_unsigned_value_of_type(a) - (a))
48
49#ifdef __GNUC__
50#define TYPEOF(x) (__typeof__(x))
51#else
52#define TYPEOF(x)
53#endif
54
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 */
57
58#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
59
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)
62
63#if defined(__sun__)
64 /*
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.
70 */
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
87
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
97
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
128
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
155/*
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.
161 */
162typedef long intptr_t;
163typedef 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
175
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
184
185#ifdef MKDIR_WO_TRAILING_SLASH
186#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
187extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
188#endif
189
190#ifdef NO_STRUCT_ITIMERVAL
191struct itimerval {
192 struct timeval it_interval;
193 struct timeval it_value;
194};
195#endif
196
197#ifdef NO_SETITIMER
198#define setitimer(which,value,ovalue)
199#endif
200
201#ifndef NO_LIBGEN_H
202#include <libgen.h>
203#else
204#define basename gitbasename
205extern char *gitbasename(char *);
206#endif
207
208#ifndef NO_ICONV
209#include <iconv.h>
210#endif
211
212#ifndef NO_OPENSSL
213#include <openssl/ssl.h>
214#include <openssl/err.h>
215#endif
216
217/* On most systems <netdb.h> would have given us this, but
218 * not on some systems (e.g. z/OS).
219 */
220#ifndef NI_MAXHOST
221#define NI_MAXHOST 1025
222#endif
223
224#ifndef NI_MAXSERV
225#define NI_MAXSERV 32
226#endif
227
228/* On most systems <limits.h> would have given us this, but
229 * not on some systems (e.g. GNU/Hurd).
230 */
231#ifndef PATH_MAX
232#define PATH_MAX 4096
233#endif
234
235#ifndef PRIuMAX
236#define PRIuMAX "llu"
237#endif
238
239#ifndef PRIu32
240#define PRIu32 "u"
241#endif
242
243#ifndef PRIx32
244#define PRIx32 "x"
245#endif
246
247#ifndef PRIo32
248#define PRIo32 "o"
249#endif
250
251#ifndef PATH_SEP
252#define PATH_SEP ':'
253#endif
254
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
261
262#ifndef STRIP_EXTENSION
263#define STRIP_EXTENSION ""
264#endif
265
266#ifndef has_dos_drive_prefix
267#define has_dos_drive_prefix(path) 0
268#endif
269
270#ifndef offset_1st_component
271#define offset_1st_component(path) (is_dir_sep((path)[0]))
272#endif
273
274#ifndef is_dir_sep
275#define is_dir_sep(c) ((c) == '/')
276#endif
277
278#ifndef find_last_dir_sep
279#define find_last_dir_sep(path) strrchr(path, '/')
280#endif
281
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
300
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
307
308#include "compat/bswap.h"
309
310#include "wildmatch.h"
311
312/* General helper functions */
313extern void vreportf(const char *prefix, const char *err, va_list params);
314extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
315extern NORETURN void usage(const char *err);
316extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
317extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
318extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
319extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
320extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
321
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 */
331
332/*
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.
338 */
339#if defined(__GNUC__)
340static inline int const_error(void)
341{
342 return -1;
343}
344#define error(...) (error(__VA_ARGS__), const_error())
345#endif
346
347extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
348extern void set_error_routine(void (*routine)(const char *err, va_list params));
349extern void set_die_is_recursing_routine(int (*routine)(void));
350
351extern int starts_with(const char *str, const char *prefix);
352
353/*
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).
357 *
358 * Otherwise, return 0 and leave "out" untouched.
359 *
360 * Examples:
361 *
362 * [extract branch name, fail if not a branch]
363 * if (!skip_prefix(ref, "refs/heads/", &branch)
364 * return -1;
365 *
366 * [skip prefix if present, otherwise use whole string]
367 * skip_prefix(name, "refs/heads/", &name);
368 */
369static inline int skip_prefix(const char *str, const char *prefix,
370 const char **out)
371{
372 do {
373 if (!*prefix) {
374 *out = str;
375 return 1;
376 }
377 } while (*str++ == *prefix++);
378 return 0;
379}
380
381/*
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.
384 */
385static inline int strip_suffix_mem(const char *buf, size_t *len,
386 const char *suffix)
387{
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;
393}
394
395/*
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.
399 *
400 * Note that we do _not_ NUL-terminate str to the new length.
401 */
402static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
403{
404 *len = strlen(str);
405 return strip_suffix_mem(str, len, suffix);
406}
407
408static inline int ends_with(const char *str, const char *suffix)
409{
410 size_t len;
411 return strip_suffix(str, suffix, &len);
412}
413
414#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
415
416#ifndef PROT_READ
417#define PROT_READ 1
418#define PROT_WRITE 2
419#define MAP_PRIVATE 1
420#endif
421
422#define mmap git_mmap
423#define munmap git_munmap
424extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
425extern int git_munmap(void *start, size_t length);
426
427#else /* NO_MMAP || USE_WIN32_MMAP */
428
429#include <sys/mman.h>
430
431#endif /* NO_MMAP || USE_WIN32_MMAP */
432
433#ifdef NO_MMAP
434
435/* This value must be multiple of (pagesize * 2) */
436#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
437
438#else /* NO_MMAP */
439
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)
445
446#endif /* NO_MMAP */
447
448#ifndef MAP_FAILED
449#define MAP_FAILED ((void *)-1)
450#endif
451
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
457
458#define DEFAULT_PACKED_GIT_LIMIT \
459 ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
460
461#ifdef NO_PREAD
462#define pread git_pread
463extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
464#endif
465/*
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.
469 */
470extern ssize_t read_in_full(int fd, void *buf, size_t count);
471
472#ifdef NO_SETENV
473#define setenv gitsetenv
474extern int gitsetenv(const char *, const char *, int);
475#endif
476
477#ifdef NO_MKDTEMP
478#define mkdtemp gitmkdtemp
479extern char *gitmkdtemp(char *);
480#endif
481
482#ifdef NO_MKSTEMPS
483#define mkstemps gitmkstemps
484extern int gitmkstemps(char *, int);
485#endif
486
487#ifdef NO_UNSETENV
488#define unsetenv gitunsetenv
489extern void gitunsetenv(const char *);
490#endif
491
492#ifdef NO_STRCASESTR
493#define strcasestr gitstrcasestr
494extern char *gitstrcasestr(const char *haystack, const char *needle);
495#endif
496
497#ifdef NO_STRLCPY
498#define strlcpy gitstrlcpy
499extern size_t gitstrlcpy(char *, const char *, size_t);
500#endif
501
502#ifdef NO_STRTOUMAX
503#define strtoumax gitstrtoumax
504extern uintmax_t gitstrtoumax(const char *, char **, int);
505#define strtoimax gitstrtoimax
506extern intmax_t gitstrtoimax(const char *, char **, int);
507#endif
508
509#ifdef NO_HSTRERROR
510#define hstrerror githstrerror
511extern const char *githstrerror(int herror);
512#endif
513
514#ifdef NO_MEMMEM
515#define memmem gitmemmem
516void *gitmemmem(const void *haystack, size_t haystacklen,
517 const void *needle, size_t needlelen);
518#endif
519
520#ifdef NO_GETPAGESIZE
521#define getpagesize() sysconf(_SC_PAGESIZE)
522#endif
523
524#ifdef FREAD_READS_DIRECTORIES
525#ifdef fopen
526#undef fopen
527#endif
528#define fopen(a,b) git_fopen(a,b)
529extern FILE *git_fopen(const char*, const char*);
530#endif
531
532#ifdef SNPRINTF_RETURNS_BOGUS
533#ifdef snprintf
534#undef snprintf
535#endif
536#define snprintf git_snprintf
537extern 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
543extern int git_vsnprintf(char *str, size_t maxsize,
544 const char *format, va_list ap);
545#endif
546
547#ifdef __GLIBC_PREREQ
548#if __GLIBC_PREREQ(2, 1)
549#define HAVE_STRCHRNUL
550#define HAVE_MEMPCPY
551#endif
552#endif
553
554#ifndef HAVE_STRCHRNUL
555#define strchrnul gitstrchrnul
556static inline char *gitstrchrnul(const char *s, int c)
557{
558 while (*s && *s != c)
559 s++;
560 return (char *)s;
561}
562#endif
563
564#ifndef HAVE_MEMPCPY
565#define mempcpy gitmempcpy
566static inline void *gitmempcpy(void *dest, const void *src, size_t n)
567{
568 return (char *)memcpy(dest, src, n) + n;
569}
570#endif
571
572#ifdef NO_INET_PTON
573int inet_pton(int af, const char *src, void *dst);
574#endif
575
576#ifdef NO_INET_NTOP
577const char *inet_ntop(int af, const void *src, char *dst, size_t size);
578#endif
579
580extern void release_pack_memory(size_t);
581
582typedef void (*try_to_free_t)(size_t);
583extern try_to_free_t set_try_to_free_routine(try_to_free_t);
584
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
593extern char *xstrdup(const char *str);
594extern void *xmalloc(size_t size);
595extern void *xmallocz(size_t size);
596extern void *xmemdupz(const void *data, size_t len);
597extern char *xstrndup(const char *str, size_t len);
598extern void *xrealloc(void *ptr, size_t size);
599extern void *xcalloc(size_t nmemb, size_t size);
600extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
601extern ssize_t xread(int fd, void *buf, size_t len);
602extern ssize_t xwrite(int fd, const void *buf, size_t len);
603extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
604extern int xdup(int fd);
605extern FILE *xfdopen(int fd, const char *mode);
606extern int xmkstemp(char *template);
607extern int xmkstemp_mode(char *template, int mode);
608extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
609extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
610
611static inline size_t xsize_t(off_t len)
612{
613 if (len > (size_t) len)
614 die("Cannot handle files this big");
615 return (size_t)len;
616}
617
618/* in ctype.c, for kwset users */
619extern const char tolower_trans_tbl[256];
620
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
635
636extern 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)
663
664static inline int sane_case(int x, int high)
665{
666 if (sane_istest(x, GIT_ALPHA))
667 x = (x & ~0x20) | high;
668 return x;
669}
670
671static inline int sane_iscase(int x, int is_lower)
672{
673 if (!sane_istest(x, GIT_ALPHA))
674 return 0;
675
676 if (is_lower)
677 return (x & 0x20) != 0;
678 else
679 return (x & 0x20) == 0;
680}
681
682static inline int strtoul_ui(char const *s, int base, unsigned int *result)
683{
684 unsigned long ul;
685 char *p;
686
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;
693}
694
695static inline int strtol_i(char const *s, int base, int *result)
696{
697 long ul;
698 char *p;
699
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;
706}
707
708#ifdef INTERNAL_QSORT
709void git_qsort(void *base, size_t nmemb, size_t size,
710 int(*compar)(const void *, const void *));
711#define qsort git_qsort
712#endif
713
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
719
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
733
734#ifdef UNRELIABLE_FSTAT
735#define fstat_is_reliable() 0
736#else
737#define fstat_is_reliable() 1
738#endif
739
740#ifndef va_copy
741/*
742 * Since an obvious implementation of va_list would be to make it a
743 * pointer into the stack frame, a simple assignment will work on
744 * many systems. But let's try to be more portable.
745 */
746#ifdef __va_copy
747#define va_copy(dst, src) __va_copy(dst, src)
748#else
749#define va_copy(dst, src) ((dst) = (src))
750#endif
751#endif
752
753#if defined(__GNUC__) || (_MSC_VER >= 1400)
754#define HAVE_VARIADIC_MACROS 1
755#endif
756
757/*
758 * Preserves errno, prints a message, but gives no warning for ENOENT.
759 * Always returns the return value of unlink(2).
760 */
761int unlink_or_warn(const char *path);
762/*
763 * Likewise for rmdir(2).
764 */
765int rmdir_or_warn(const char *path);
766/*
767 * Calls the correct function out of {unlink,rmdir}_or_warn based on
768 * the supplied file mode.
769 */
770int remove_or_warn(unsigned int mode, const char *path);
771
772/*
773 * Call access(2), but warn for any error except "missing file"
774 * (ENOENT or ENOTDIR).
775 */
776#define ACCESS_EACCES_OK (1U << 0)
777int access_or_warn(const char *path, int mode, unsigned flag);
778int access_or_die(const char *path, int mode, unsigned flag);
779
780/* Warn on an inaccessible file that ought to be accessible */
781void warn_on_inaccessible(const char *path);
782
783/* Get the passwd entry for the UID of the current process. */
784struct passwd *xgetpwuid_self(void);
785
786#ifdef GMTIME_UNRELIABLE_ERRORS
787struct tm *git_gmtime(const time_t *);
788struct tm *git_gmtime_r(const time_t *, struct tm *);
789#define gmtime git_gmtime
790#define gmtime_r git_gmtime_r
791#endif
792
793#endif