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