git-compat-util.h

   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__)
  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 #ifdef WIN32 /* Both MinGW and MSVC */
  89 # if defined (_MSC_VER)
  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 #endif
  96
  97 #include <unistd.h>
  98 #include <stdio.h>
  99 #include <sys/stat.h>
 100 #include <fcntl.h>
 101 #include <stddef.h>
 102 #include <stdlib.h>
 103 #include <stdarg.h>
 104 #include <string.h>
 105 #ifdef HAVE_STRINGS_H
 106 #include <strings.h> /* for strcasecmp() */
 107 #endif
 108 #include <errno.h>
 109 #include <limits.h>
 110 #ifdef NEEDS_SYS_PARAM_H
 111 #include <sys/param.h>
 112 #endif
 113 #include <sys/types.h>
 114 #include <dirent.h>
 115 #include <sys/time.h>
 116 #include <time.h>
 117 #include <signal.h>
 118 #ifndef USE_WILDMATCH
 119 #include <fnmatch.h>
 120 #endif
 121 #include <assert.h>
 122 #include <regex.h>
 123 #include <utime.h>
 124 #include <syslog.h>
 125 #ifndef NO_SYS_POLL_H
 126 #include <sys/poll.h>
 127 #else
 128 #include <poll.h>
 129 #endif
 130
 131 extern int get_st_mode_bits(const char *path, int *mode);
 132
 133 #if defined(__MINGW32__)
 134 /* pull in Windows compatibility stuff */
 135 #include "compat/mingw.h"
 136 #elif defined(_MSC_VER)
 137 #include "compat/msvc.h"
 138 #else
 139 #include <sys/wait.h>
 140 #include <sys/resource.h>
 141 #include <sys/socket.h>
 142 #include <sys/ioctl.h>
 143 #include <termios.h>
 144 #ifndef NO_SYS_SELECT_H
 145 #include <sys/select.h>
 146 #endif
 147 #include <netinet/in.h>
 148 #include <netinet/tcp.h>
 149 #include <arpa/inet.h>
 150 #include <netdb.h>
 151 #include <pwd.h>
 152 #include <sys/un.h>
 153 #ifndef NO_INTTYPES_H
 154 #include <inttypes.h>
 155 #else
 156 #include <stdint.h>
 157 #endif
 158 #ifdef NO_INTPTR_T
 159 /*
 160  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 161  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 162  * while on IP16 and IP16L32 it is "int" (resp. "short")
 163  * Size needs to match (or exceed) 'sizeof(void *)'.
 164  * We can't take "long long" here as not everybody has it.
 165  */
 166 typedef long intptr_t;
 167 typedef unsigned long uintptr_t;
 168 #endif
 169 #if defined(__CYGWIN__)
 170 #undef _XOPEN_SOURCE
 171 #include <grp.h>
 172 #define _XOPEN_SOURCE 600
 173 #include "compat/cygwin.h"
 174 #else
 175 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 176 #include <grp.h>
 177 #define _ALL_SOURCE 1
 178 #endif
 179 #endif
 180
 181 /* used on Mac OS X */
 182 #ifdef PRECOMPOSE_UNICODE
 183 #include "compat/precompose_utf8.h"
 184 #else
 185 #define precompose_str(in,i_nfd2nfc)
 186 #define precompose_argv(c,v)
 187 #define probe_utf8_pathname_composition(a,b)
 188 #endif
 189
 190 #ifdef MKDIR_WO_TRAILING_SLASH
 191 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 192 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 193 #endif
 194
 195 #ifdef NO_STRUCT_ITIMERVAL
 196 struct itimerval {
 197         struct timeval it_interval;
 198         struct timeval it_value;
 199 }
 200 #endif
 201
 202 #ifdef NO_SETITIMER
 203 #define setitimer(which,value,ovalue)
 204 #endif
 205
 206 #ifndef NO_LIBGEN_H
 207 #include <libgen.h>
 208 #else
 209 #define basename gitbasename
 210 extern char *gitbasename(char *);
 211 #endif
 212
 213 #ifndef NO_ICONV
 214 #include <iconv.h>
 215 #endif
 216
 217 #ifndef NO_OPENSSL
 218 #include <openssl/ssl.h>
 219 #include <openssl/err.h>
 220 #endif
 221
 222 /* On most systems <netdb.h> would have given us this, but
 223  * not on some systems (e.g. z/OS).
 224  */
 225 #ifndef NI_MAXHOST
 226 #define NI_MAXHOST 1025
 227 #endif
 228
 229 #ifndef NI_MAXSERV
 230 #define NI_MAXSERV 32
 231 #endif
 232
 233 /* On most systems <limits.h> would have given us this, but
 234  * not on some systems (e.g. GNU/Hurd).
 235  */
 236 #ifndef PATH_MAX
 237 #define PATH_MAX 4096
 238 #endif
 239
 240 #ifndef PRIuMAX
 241 #define PRIuMAX "llu"
 242 #endif
 243
 244 #ifndef PRIu32
 245 #define PRIu32 "u"
 246 #endif
 247
 248 #ifndef PRIx32
 249 #define PRIx32 "x"
 250 #endif
 251
 252 #ifndef PRIo32
 253 #define PRIo32 "o"
 254 #endif
 255
 256 #ifndef PATH_SEP
 257 #define PATH_SEP ':'
 258 #endif
 259
 260 #ifdef HAVE_PATHS_H
 261 #include <paths.h>
 262 #endif
 263 #ifndef _PATH_DEFPATH
 264 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 265 #endif
 266
 267 #ifndef STRIP_EXTENSION
 268 #define STRIP_EXTENSION ""
 269 #endif
 270
 271 #ifndef has_dos_drive_prefix
 272 #define has_dos_drive_prefix(path) 0
 273 #endif
 274
 275 #ifndef is_dir_sep
 276 #define is_dir_sep(c) ((c) == '/')
 277 #endif
 278
 279 #ifndef find_last_dir_sep
 280 #define find_last_dir_sep(path) strrchr(path, '/')
 281 #endif
 282
 283 #if defined(__HP_cc) && (__HP_cc >= 61000)
 284 #define NORETURN __attribute__((noreturn))
 285 #define NORETURN_PTR
 286 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 287 #define NORETURN __attribute__((__noreturn__))
 288 #define NORETURN_PTR __attribute__((__noreturn__))
 289 #elif defined(_MSC_VER)
 290 #define NORETURN __declspec(noreturn)
 291 #define NORETURN_PTR
 292 #else
 293 #define NORETURN
 294 #define NORETURN_PTR
 295 #ifndef __attribute__
 296 #define __attribute__(x)
 297 #endif
 298 #endif
 299
 300 #include "compat/bswap.h"
 301
 302 #ifdef USE_WILDMATCH
 303 #include "wildmatch.h"
 304 #define FNM_PATHNAME WM_PATHNAME
 305 #define FNM_CASEFOLD WM_CASEFOLD
 306 #define FNM_NOMATCH  WM_NOMATCH
 307 static inline int fnmatch(const char *pattern, const char *string, int flags)
 308 {
 309         return wildmatch(pattern, string, flags, NULL);
 310 }
 311 #endif
 312
 313 /* General helper functions */
 314 extern void vreportf(const char *prefix, const char *err, va_list params);
 315 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 316 extern NORETURN void usage(const char *err);
 317 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 318 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 319 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 320 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 321 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 322
 323 /*
 324  * Let callers be aware of the constant return value; this can help
 325  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 326  * because some compilers may not support variadic macros. Since we're only
 327  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 328  * using the function as usual.
 329  */
 330 #if defined(__GNUC__) && ! defined(__clang__)
 331 #define error(...) (error(__VA_ARGS__), -1)
 332 #endif
 333
 334 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 335 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 336 extern void set_die_is_recursing_routine(int (*routine)(void));
 337
 338 extern int prefixcmp(const char *str, const char *prefix);
 339 extern int suffixcmp(const char *str, const char *suffix);
 340
 341 static inline const char *skip_prefix(const char *str, const char *prefix)
 342 {
 343         size_t len = strlen(prefix);
 344         return strncmp(str, prefix, len) ? NULL : str + len;
 345 }
 346
 347 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 348
 349 #ifndef PROT_READ
 350 #define PROT_READ 1
 351 #define PROT_WRITE 2
 352 #define MAP_PRIVATE 1
 353 #endif
 354
 355 #define mmap git_mmap
 356 #define munmap git_munmap
 357 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 358 extern int git_munmap(void *start, size_t length);
 359
 360 #else /* NO_MMAP || USE_WIN32_MMAP */
 361
 362 #include <sys/mman.h>
 363
 364 #endif /* NO_MMAP || USE_WIN32_MMAP */
 365
 366 #ifdef NO_MMAP
 367
 368 /* This value must be multiple of (pagesize * 2) */
 369 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 370
 371 #else /* NO_MMAP */
 372
 373 /* This value must be multiple of (pagesize * 2) */
 374 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 375         (sizeof(void*) >= 8 \
 376                 ?  1 * 1024 * 1024 * 1024 \
 377                 : 32 * 1024 * 1024)
 378
 379 #endif /* NO_MMAP */
 380
 381 #ifndef MAP_FAILED
 382 #define MAP_FAILED ((void *)-1)
 383 #endif
 384
 385 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 386 #define on_disk_bytes(st) ((st).st_size)
 387 #else
 388 #define on_disk_bytes(st) ((st).st_blocks * 512)
 389 #endif
 390
 391 #define DEFAULT_PACKED_GIT_LIMIT \
 392         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 393
 394 #ifdef NO_PREAD
 395 #define pread git_pread
 396 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 397 #endif
 398 /*
 399  * Forward decl that will remind us if its twin in cache.h changes.
 400  * This function is used in compat/pread.c.  But we can't include
 401  * cache.h there.
 402  */
 403 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 404
 405 #ifdef NO_SETENV
 406 #define setenv gitsetenv
 407 extern int gitsetenv(const char *, const char *, int);
 408 #endif
 409
 410 #ifdef NO_MKDTEMP
 411 #define mkdtemp gitmkdtemp
 412 extern char *gitmkdtemp(char *);
 413 #endif
 414
 415 #ifdef NO_MKSTEMPS
 416 #define mkstemps gitmkstemps
 417 extern int gitmkstemps(char *, int);
 418 #endif
 419
 420 #ifdef NO_UNSETENV
 421 #define unsetenv gitunsetenv
 422 extern void gitunsetenv(const char *);
 423 #endif
 424
 425 #ifdef NO_STRCASESTR
 426 #define strcasestr gitstrcasestr
 427 extern char *gitstrcasestr(const char *haystack, const char *needle);
 428 #endif
 429
 430 #ifdef NO_STRLCPY
 431 #define strlcpy gitstrlcpy
 432 extern size_t gitstrlcpy(char *, const char *, size_t);
 433 #endif
 434
 435 #ifdef NO_STRTOUMAX
 436 #define strtoumax gitstrtoumax
 437 extern uintmax_t gitstrtoumax(const char *, char **, int);
 438 #define strtoimax gitstrtoimax
 439 extern intmax_t gitstrtoimax(const char *, char **, int);
 440 #endif
 441
 442 #ifdef NO_HSTRERROR
 443 #define hstrerror githstrerror
 444 extern const char *githstrerror(int herror);
 445 #endif
 446
 447 #ifdef NO_MEMMEM
 448 #define memmem gitmemmem
 449 void *gitmemmem(const void *haystack, size_t haystacklen,
 450                 const void *needle, size_t needlelen);
 451 #endif
 452
 453 #ifdef NO_GETPAGESIZE
 454 #define getpagesize() sysconf(_SC_PAGESIZE)
 455 #endif
 456
 457 #ifdef FREAD_READS_DIRECTORIES
 458 #ifdef fopen
 459 #undef fopen
 460 #endif
 461 #define fopen(a,b) git_fopen(a,b)
 462 extern FILE *git_fopen(const char*, const char*);
 463 #endif
 464
 465 #ifdef SNPRINTF_RETURNS_BOGUS
 466 #define snprintf git_snprintf
 467 extern int git_snprintf(char *str, size_t maxsize,
 468                         const char *format, ...);
 469 #define vsnprintf git_vsnprintf
 470 extern int git_vsnprintf(char *str, size_t maxsize,
 471                          const char *format, va_list ap);
 472 #endif
 473
 474 #ifdef __GLIBC_PREREQ
 475 #if __GLIBC_PREREQ(2, 1)
 476 #define HAVE_STRCHRNUL
 477 #define HAVE_MEMPCPY
 478 #endif
 479 #endif
 480
 481 #ifndef HAVE_STRCHRNUL
 482 #define strchrnul gitstrchrnul
 483 static inline char *gitstrchrnul(const char *s, int c)
 484 {
 485         while (*s && *s != c)
 486                 s++;
 487         return (char *)s;
 488 }
 489 #endif
 490
 491 #ifndef HAVE_MEMPCPY
 492 #define mempcpy gitmempcpy
 493 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 494 {
 495         return (char *)memcpy(dest, src, n) + n;
 496 }
 497 #endif
 498
 499 #ifdef NO_INET_PTON
 500 int inet_pton(int af, const char *src, void *dst);
 501 #endif
 502
 503 #ifdef NO_INET_NTOP
 504 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 505 #endif
 506
 507 extern void release_pack_memory(size_t, int);
 508
 509 typedef void (*try_to_free_t)(size_t);
 510 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 511
 512 extern char *xstrdup(const char *str);
 513 extern void *xmalloc(size_t size);
 514 extern void *xmallocz(size_t size);
 515 extern void *xmemdupz(const void *data, size_t len);
 516 extern char *xstrndup(const char *str, size_t len);
 517 extern void *xrealloc(void *ptr, size_t size);
 518 extern void *xcalloc(size_t nmemb, size_t size);
 519 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 520 extern ssize_t xread(int fd, void *buf, size_t len);
 521 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 522 extern int xdup(int fd);
 523 extern FILE *xfdopen(int fd, const char *mode);
 524 extern int xmkstemp(char *template);
 525 extern int xmkstemp_mode(char *template, int mode);
 526 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 527 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 528
 529 static inline size_t xsize_t(off_t len)
 530 {
 531         if (len > (size_t) len)
 532                 die("Cannot handle files this big");
 533         return (size_t)len;
 534 }
 535
 536 static inline int has_extension(const char *filename, const char *ext)
 537 {
 538         size_t len = strlen(filename);
 539         size_t extlen = strlen(ext);
 540         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 541 }
 542
 543 /* in ctype.c, for kwset users */
 544 extern const char tolower_trans_tbl[256];
 545
 546 /* Sane ctype - no locale, and works with signed chars */
 547 #undef isascii
 548 #undef isspace
 549 #undef isdigit
 550 #undef isalpha
 551 #undef isalnum
 552 #undef isprint
 553 #undef islower
 554 #undef isupper
 555 #undef tolower
 556 #undef toupper
 557 #undef iscntrl
 558 #undef ispunct
 559 #undef isxdigit
 560
 561 extern const unsigned char sane_ctype[256];
 562 #define GIT_SPACE 0x01
 563 #define GIT_DIGIT 0x02
 564 #define GIT_ALPHA 0x04
 565 #define GIT_GLOB_SPECIAL 0x08
 566 #define GIT_REGEX_SPECIAL 0x10
 567 #define GIT_PATHSPEC_MAGIC 0x20
 568 #define GIT_CNTRL 0x40
 569 #define GIT_PUNCT 0x80
 570 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 571 #define isascii(x) (((x) & ~0x7f) == 0)
 572 #define isspace(x) sane_istest(x,GIT_SPACE)
 573 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 574 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 575 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 576 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 577 #define islower(x) sane_iscase(x, 1)
 578 #define isupper(x) sane_iscase(x, 0)
 579 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 580 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 581 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 582 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 583                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 584 #define isxdigit(x) (hexval_table[x] != -1)
 585 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 586 #define toupper(x) sane_case((unsigned char)(x), 0)
 587 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 588
 589 static inline int sane_case(int x, int high)
 590 {
 591         if (sane_istest(x, GIT_ALPHA))
 592                 x = (x & ~0x20) | high;
 593         return x;
 594 }
 595
 596 static inline int sane_iscase(int x, int is_lower)
 597 {
 598         if (!sane_istest(x, GIT_ALPHA))
 599                 return 0;
 600
 601         if (is_lower)
 602                 return (x & 0x20) != 0;
 603         else
 604                 return (x & 0x20) == 0;
 605 }
 606
 607 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 608 {
 609         unsigned long ul;
 610         char *p;
 611
 612         errno = 0;
 613         ul = strtoul(s, &p, base);
 614         if (errno || *p || p == s || (unsigned int) ul != ul)
 615                 return -1;
 616         *result = ul;
 617         return 0;
 618 }
 619
 620 static inline int strtol_i(char const *s, int base, int *result)
 621 {
 622         long ul;
 623         char *p;
 624
 625         errno = 0;
 626         ul = strtol(s, &p, base);
 627         if (errno || *p || p == s || (int) ul != ul)
 628                 return -1;
 629         *result = ul;
 630         return 0;
 631 }
 632
 633 #ifdef INTERNAL_QSORT
 634 void git_qsort(void *base, size_t nmemb, size_t size,
 635                int(*compar)(const void *, const void *));
 636 #define qsort git_qsort
 637 #endif
 638
 639 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 640 # define FORCE_DIR_SET_GID S_ISGID
 641 #else
 642 # define FORCE_DIR_SET_GID 0
 643 #endif
 644
 645 #ifdef NO_NSEC
 646 #undef USE_NSEC
 647 #define ST_CTIME_NSEC(st) 0
 648 #define ST_MTIME_NSEC(st) 0
 649 #else
 650 #ifdef USE_ST_TIMESPEC
 651 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 652 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 653 #else
 654 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 655 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 656 #endif
 657 #endif
 658
 659 #ifdef UNRELIABLE_FSTAT
 660 #define fstat_is_reliable() 0
 661 #else
 662 #define fstat_is_reliable() 1
 663 #endif
 664
 665 #ifndef va_copy
 666 /*
 667  * Since an obvious implementation of va_list would be to make it a
 668  * pointer into the stack frame, a simple assignment will work on
 669  * many systems.  But let's try to be more portable.
 670  */
 671 #ifdef __va_copy
 672 #define va_copy(dst, src) __va_copy(dst, src)
 673 #else
 674 #define va_copy(dst, src) ((dst) = (src))
 675 #endif
 676 #endif
 677
 678 /*
 679  * Preserves errno, prints a message, but gives no warning for ENOENT.
 680  * Always returns the return value of unlink(2).
 681  */
 682 int unlink_or_warn(const char *path);
 683 /*
 684  * Likewise for rmdir(2).
 685  */
 686 int rmdir_or_warn(const char *path);
 687 /*
 688  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 689  * the supplied file mode.
 690  */
 691 int remove_or_warn(unsigned int mode, const char *path);
 692
 693 /*
 694  * Call access(2), but warn for any error except "missing file"
 695  * (ENOENT or ENOTDIR).
 696  */
 697 int access_or_warn(const char *path, int mode);
 698 int access_or_die(const char *path, int mode);
 699
 700 /* Warn on an inaccessible file that ought to be accessible */
 701 void warn_on_inaccessible(const char *path);
 702
 703 /* Get the passwd entry for the UID of the current process. */
 704 struct passwd *xgetpwuid_self(void);
 705
 706 #endif