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 #if defined(__MINGW32__)
 131 /* pull in Windows compatibility stuff */
 132 #include "compat/mingw.h"
 133 #elif defined(_MSC_VER)
 134 #include "compat/msvc.h"
 135 #else
 136 #include <sys/wait.h>
 137 #include <sys/resource.h>
 138 #include <sys/socket.h>
 139 #include <sys/ioctl.h>
 140 #include <termios.h>
 141 #ifndef NO_SYS_SELECT_H
 142 #include <sys/select.h>
 143 #endif
 144 #include <netinet/in.h>
 145 #include <netinet/tcp.h>
 146 #include <arpa/inet.h>
 147 #include <netdb.h>
 148 #include <pwd.h>
 149 #include <sys/un.h>
 150 #ifndef NO_INTTYPES_H
 151 #include <inttypes.h>
 152 #else
 153 #include <stdint.h>
 154 #endif
 155 #ifdef NO_INTPTR_T
 156 /*
 157  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 158  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 159  * while on IP16 and IP16L32 it is "int" (resp. "short")
 160  * Size needs to match (or exceed) 'sizeof(void *)'.
 161  * We can't take "long long" here as not everybody has it.
 162  */
 163 typedef long intptr_t;
 164 typedef unsigned long uintptr_t;
 165 #endif
 166 int get_st_mode_bits(const char *path, int *mode);
 167 #if defined(__CYGWIN__)
 168 #undef _XOPEN_SOURCE
 169 #include <grp.h>
 170 #define _XOPEN_SOURCE 600
 171 #include "compat/cygwin.h"
 172 #else
 173 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 174 #include <grp.h>
 175 #define _ALL_SOURCE 1
 176 #endif
 177 #endif
 178
 179 /* used on Mac OS X */
 180 #ifdef PRECOMPOSE_UNICODE
 181 #include "compat/precompose_utf8.h"
 182 #else
 183 #define precompose_str(in,i_nfd2nfc)
 184 #define precompose_argv(c,v)
 185 #define probe_utf8_pathname_composition(a,b)
 186 #endif
 187
 188 #ifdef MKDIR_WO_TRAILING_SLASH
 189 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 190 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 191 #endif
 192
 193 #ifdef NO_STRUCT_ITIMERVAL
 194 struct itimerval {
 195         struct timeval it_interval;
 196         struct timeval it_value;
 197 }
 198 #endif
 199
 200 #ifdef NO_SETITIMER
 201 #define setitimer(which,value,ovalue)
 202 #endif
 203
 204 #ifndef NO_LIBGEN_H
 205 #include <libgen.h>
 206 #else
 207 #define basename gitbasename
 208 extern char *gitbasename(char *);
 209 #endif
 210
 211 #ifndef NO_ICONV
 212 #include <iconv.h>
 213 #endif
 214
 215 #ifndef NO_OPENSSL
 216 #include <openssl/ssl.h>
 217 #include <openssl/err.h>
 218 #endif
 219
 220 /* On most systems <netdb.h> would have given us this, but
 221  * not on some systems (e.g. z/OS).
 222  */
 223 #ifndef NI_MAXHOST
 224 #define NI_MAXHOST 1025
 225 #endif
 226
 227 #ifndef NI_MAXSERV
 228 #define NI_MAXSERV 32
 229 #endif
 230
 231 /* On most systems <limits.h> would have given us this, but
 232  * not on some systems (e.g. GNU/Hurd).
 233  */
 234 #ifndef PATH_MAX
 235 #define PATH_MAX 4096
 236 #endif
 237
 238 #ifndef PRIuMAX
 239 #define PRIuMAX "llu"
 240 #endif
 241
 242 #ifndef PRIu32
 243 #define PRIu32 "u"
 244 #endif
 245
 246 #ifndef PRIx32
 247 #define PRIx32 "x"
 248 #endif
 249
 250 #ifndef PRIo32
 251 #define PRIo32 "o"
 252 #endif
 253
 254 #ifndef PATH_SEP
 255 #define PATH_SEP ':'
 256 #endif
 257
 258 #ifdef HAVE_PATHS_H
 259 #include <paths.h>
 260 #endif
 261 #ifndef _PATH_DEFPATH
 262 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 263 #endif
 264
 265 #ifndef STRIP_EXTENSION
 266 #define STRIP_EXTENSION ""
 267 #endif
 268
 269 #ifndef has_dos_drive_prefix
 270 #define has_dos_drive_prefix(path) 0
 271 #endif
 272
 273 #ifndef offset_1st_component
 274 #define offset_1st_component(path) (is_dir_sep((path)[0]))
 275 #endif
 276
 277 #ifndef is_dir_sep
 278 #define is_dir_sep(c) ((c) == '/')
 279 #endif
 280
 281 #ifndef find_last_dir_sep
 282 #define find_last_dir_sep(path) strrchr(path, '/')
 283 #endif
 284
 285 #if defined(__HP_cc) && (__HP_cc >= 61000)
 286 #define NORETURN __attribute__((noreturn))
 287 #define NORETURN_PTR
 288 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 289 #define NORETURN __attribute__((__noreturn__))
 290 #define NORETURN_PTR __attribute__((__noreturn__))
 291 #elif defined(_MSC_VER)
 292 #define NORETURN __declspec(noreturn)
 293 #define NORETURN_PTR
 294 #else
 295 #define NORETURN
 296 #define NORETURN_PTR
 297 #ifndef __attribute__
 298 #define __attribute__(x)
 299 #endif
 300 #endif
 301
 302 #include "compat/bswap.h"
 303
 304 #ifdef USE_WILDMATCH
 305 #include "wildmatch.h"
 306 #define FNM_PATHNAME WM_PATHNAME
 307 #define FNM_CASEFOLD WM_CASEFOLD
 308 #define FNM_NOMATCH  WM_NOMATCH
 309 static inline int fnmatch(const char *pattern, const char *string, int flags)
 310 {
 311         return wildmatch(pattern, string, flags, NULL);
 312 }
 313 #endif
 314
 315 /* General helper functions */
 316 extern void vreportf(const char *prefix, const char *err, va_list params);
 317 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 318 extern NORETURN void usage(const char *err);
 319 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 320 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 321 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 322 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 323 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 324
 325 /*
 326  * Let callers be aware of the constant return value; this can help
 327  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 328  * because some compilers may not support variadic macros. Since we're only
 329  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 330  * using the function as usual.
 331  */
 332 #if defined(__GNUC__) && ! defined(__clang__)
 333 #define error(...) (error(__VA_ARGS__), -1)
 334 #endif
 335
 336 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 337 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 338 extern void set_die_is_recursing_routine(int (*routine)(void));
 339
 340 extern int prefixcmp(const char *str, const char *prefix);
 341 extern int suffixcmp(const char *str, const char *suffix);
 342
 343 static inline const char *skip_prefix(const char *str, const char *prefix)
 344 {
 345         size_t len = strlen(prefix);
 346         return strncmp(str, prefix, len) ? NULL : str + len;
 347 }
 348
 349 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 350
 351 #ifndef PROT_READ
 352 #define PROT_READ 1
 353 #define PROT_WRITE 2
 354 #define MAP_PRIVATE 1
 355 #endif
 356
 357 #define mmap git_mmap
 358 #define munmap git_munmap
 359 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 360 extern int git_munmap(void *start, size_t length);
 361
 362 #else /* NO_MMAP || USE_WIN32_MMAP */
 363
 364 #include <sys/mman.h>
 365
 366 #endif /* NO_MMAP || USE_WIN32_MMAP */
 367
 368 #ifdef NO_MMAP
 369
 370 /* This value must be multiple of (pagesize * 2) */
 371 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 372
 373 #else /* NO_MMAP */
 374
 375 /* This value must be multiple of (pagesize * 2) */
 376 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 377         (sizeof(void*) >= 8 \
 378                 ?  1 * 1024 * 1024 * 1024 \
 379                 : 32 * 1024 * 1024)
 380
 381 #endif /* NO_MMAP */
 382
 383 #ifndef MAP_FAILED
 384 #define MAP_FAILED ((void *)-1)
 385 #endif
 386
 387 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 388 #define on_disk_bytes(st) ((st).st_size)
 389 #else
 390 #define on_disk_bytes(st) ((st).st_blocks * 512)
 391 #endif
 392
 393 #define DEFAULT_PACKED_GIT_LIMIT \
 394         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 395
 396 #ifdef NO_PREAD
 397 #define pread git_pread
 398 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 399 #endif
 400 /*
 401  * Forward decl that will remind us if its twin in cache.h changes.
 402  * This function is used in compat/pread.c.  But we can't include
 403  * cache.h there.
 404  */
 405 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 406
 407 #ifdef NO_SETENV
 408 #define setenv gitsetenv
 409 extern int gitsetenv(const char *, const char *, int);
 410 #endif
 411
 412 #ifdef NO_MKDTEMP
 413 #define mkdtemp gitmkdtemp
 414 extern char *gitmkdtemp(char *);
 415 #endif
 416
 417 #ifdef NO_MKSTEMPS
 418 #define mkstemps gitmkstemps
 419 extern int gitmkstemps(char *, int);
 420 #endif
 421
 422 #ifdef NO_UNSETENV
 423 #define unsetenv gitunsetenv
 424 extern void gitunsetenv(const char *);
 425 #endif
 426
 427 #ifdef NO_STRCASESTR
 428 #define strcasestr gitstrcasestr
 429 extern char *gitstrcasestr(const char *haystack, const char *needle);
 430 #endif
 431
 432 #ifdef NO_STRLCPY
 433 #define strlcpy gitstrlcpy
 434 extern size_t gitstrlcpy(char *, const char *, size_t);
 435 #endif
 436
 437 #ifdef NO_STRTOUMAX
 438 #define strtoumax gitstrtoumax
 439 extern uintmax_t gitstrtoumax(const char *, char **, int);
 440 #define strtoimax gitstrtoimax
 441 extern intmax_t gitstrtoimax(const char *, char **, int);
 442 #endif
 443
 444 #ifdef NO_HSTRERROR
 445 #define hstrerror githstrerror
 446 extern const char *githstrerror(int herror);
 447 #endif
 448
 449 #ifdef NO_MEMMEM
 450 #define memmem gitmemmem
 451 void *gitmemmem(const void *haystack, size_t haystacklen,
 452                 const void *needle, size_t needlelen);
 453 #endif
 454
 455 #ifdef NO_GETPAGESIZE
 456 #define getpagesize() sysconf(_SC_PAGESIZE)
 457 #endif
 458
 459 #ifdef FREAD_READS_DIRECTORIES
 460 #ifdef fopen
 461 #undef fopen
 462 #endif
 463 #define fopen(a,b) git_fopen(a,b)
 464 extern FILE *git_fopen(const char*, const char*);
 465 #endif
 466
 467 #ifdef SNPRINTF_RETURNS_BOGUS
 468 #define snprintf git_snprintf
 469 extern int git_snprintf(char *str, size_t maxsize,
 470                         const char *format, ...);
 471 #define vsnprintf git_vsnprintf
 472 extern int git_vsnprintf(char *str, size_t maxsize,
 473                          const char *format, va_list ap);
 474 #endif
 475
 476 #ifdef __GLIBC_PREREQ
 477 #if __GLIBC_PREREQ(2, 1)
 478 #define HAVE_STRCHRNUL
 479 #define HAVE_MEMPCPY
 480 #endif
 481 #endif
 482
 483 #ifndef HAVE_STRCHRNUL
 484 #define strchrnul gitstrchrnul
 485 static inline char *gitstrchrnul(const char *s, int c)
 486 {
 487         while (*s && *s != c)
 488                 s++;
 489         return (char *)s;
 490 }
 491 #endif
 492
 493 #ifndef HAVE_MEMPCPY
 494 #define mempcpy gitmempcpy
 495 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 496 {
 497         return (char *)memcpy(dest, src, n) + n;
 498 }
 499 #endif
 500
 501 #ifdef NO_INET_PTON
 502 int inet_pton(int af, const char *src, void *dst);
 503 #endif
 504
 505 #ifdef NO_INET_NTOP
 506 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 507 #endif
 508
 509 extern void release_pack_memory(size_t, int);
 510
 511 typedef void (*try_to_free_t)(size_t);
 512 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 513
 514 extern char *xstrdup(const char *str);
 515 extern void *xmalloc(size_t size);
 516 extern void *xmallocz(size_t size);
 517 extern void *xmemdupz(const void *data, size_t len);
 518 extern char *xstrndup(const char *str, size_t len);
 519 extern void *xrealloc(void *ptr, size_t size);
 520 extern void *xcalloc(size_t nmemb, size_t size);
 521 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 522 extern ssize_t xread(int fd, void *buf, size_t len);
 523 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 524 extern int xdup(int fd);
 525 extern FILE *xfdopen(int fd, const char *mode);
 526 extern int xmkstemp(char *template);
 527 extern int xmkstemp_mode(char *template, int mode);
 528 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 529 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 530
 531 static inline size_t xsize_t(off_t len)
 532 {
 533         if (len > (size_t) len)
 534                 die("Cannot handle files this big");
 535         return (size_t)len;
 536 }
 537
 538 static inline int has_extension(const char *filename, const char *ext)
 539 {
 540         size_t len = strlen(filename);
 541         size_t extlen = strlen(ext);
 542         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 543 }
 544
 545 /* in ctype.c, for kwset users */
 546 extern const char tolower_trans_tbl[256];
 547
 548 /* Sane ctype - no locale, and works with signed chars */
 549 #undef isascii
 550 #undef isspace
 551 #undef isdigit
 552 #undef isalpha
 553 #undef isalnum
 554 #undef isprint
 555 #undef islower
 556 #undef isupper
 557 #undef tolower
 558 #undef toupper
 559 #undef iscntrl
 560 #undef ispunct
 561 #undef isxdigit
 562
 563 extern const unsigned char sane_ctype[256];
 564 #define GIT_SPACE 0x01
 565 #define GIT_DIGIT 0x02
 566 #define GIT_ALPHA 0x04
 567 #define GIT_GLOB_SPECIAL 0x08
 568 #define GIT_REGEX_SPECIAL 0x10
 569 #define GIT_PATHSPEC_MAGIC 0x20
 570 #define GIT_CNTRL 0x40
 571 #define GIT_PUNCT 0x80
 572 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 573 #define isascii(x) (((x) & ~0x7f) == 0)
 574 #define isspace(x) sane_istest(x,GIT_SPACE)
 575 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 576 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 577 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 578 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 579 #define islower(x) sane_iscase(x, 1)
 580 #define isupper(x) sane_iscase(x, 0)
 581 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 582 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 583 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 584 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 585                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 586 #define isxdigit(x) (hexval_table[x] != -1)
 587 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 588 #define toupper(x) sane_case((unsigned char)(x), 0)
 589 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 590
 591 static inline int sane_case(int x, int high)
 592 {
 593         if (sane_istest(x, GIT_ALPHA))
 594                 x = (x & ~0x20) | high;
 595         return x;
 596 }
 597
 598 static inline int sane_iscase(int x, int is_lower)
 599 {
 600         if (!sane_istest(x, GIT_ALPHA))
 601                 return 0;
 602
 603         if (is_lower)
 604                 return (x & 0x20) != 0;
 605         else
 606                 return (x & 0x20) == 0;
 607 }
 608
 609 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 610 {
 611         unsigned long ul;
 612         char *p;
 613
 614         errno = 0;
 615         ul = strtoul(s, &p, base);
 616         if (errno || *p || p == s || (unsigned int) ul != ul)
 617                 return -1;
 618         *result = ul;
 619         return 0;
 620 }
 621
 622 static inline int strtol_i(char const *s, int base, int *result)
 623 {
 624         long ul;
 625         char *p;
 626
 627         errno = 0;
 628         ul = strtol(s, &p, base);
 629         if (errno || *p || p == s || (int) ul != ul)
 630                 return -1;
 631         *result = ul;
 632         return 0;
 633 }
 634
 635 #ifdef INTERNAL_QSORT
 636 void git_qsort(void *base, size_t nmemb, size_t size,
 637                int(*compar)(const void *, const void *));
 638 #define qsort git_qsort
 639 #endif
 640
 641 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 642 # define FORCE_DIR_SET_GID S_ISGID
 643 #else
 644 # define FORCE_DIR_SET_GID 0
 645 #endif
 646
 647 #ifdef NO_NSEC
 648 #undef USE_NSEC
 649 #define ST_CTIME_NSEC(st) 0
 650 #define ST_MTIME_NSEC(st) 0
 651 #else
 652 #ifdef USE_ST_TIMESPEC
 653 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 654 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 655 #else
 656 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 657 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 658 #endif
 659 #endif
 660
 661 #ifdef UNRELIABLE_FSTAT
 662 #define fstat_is_reliable() 0
 663 #else
 664 #define fstat_is_reliable() 1
 665 #endif
 666
 667 #ifndef va_copy
 668 /*
 669  * Since an obvious implementation of va_list would be to make it a
 670  * pointer into the stack frame, a simple assignment will work on
 671  * many systems.  But let's try to be more portable.
 672  */
 673 #ifdef __va_copy
 674 #define va_copy(dst, src) __va_copy(dst, src)
 675 #else
 676 #define va_copy(dst, src) ((dst) = (src))
 677 #endif
 678 #endif
 679
 680 /*
 681  * Preserves errno, prints a message, but gives no warning for ENOENT.
 682  * Always returns the return value of unlink(2).
 683  */
 684 int unlink_or_warn(const char *path);
 685 /*
 686  * Likewise for rmdir(2).
 687  */
 688 int rmdir_or_warn(const char *path);
 689 /*
 690  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 691  * the supplied file mode.
 692  */
 693 int remove_or_warn(unsigned int mode, const char *path);
 694
 695 /*
 696  * Call access(2), but warn for any error except "missing file"
 697  * (ENOENT or ENOTDIR).
 698  */
 699 int access_or_warn(const char *path, int mode);
 700 int access_or_die(const char *path, int mode);
 701
 702 /* Warn on an inaccessible file that ought to be accessible */
 703 void warn_on_inaccessible(const char *path);
 704
 705 /* Get the passwd entry for the UID of the current process. */
 706 struct passwd *xgetpwuid_self(void);
 707
 708 #ifndef mark_as_git_dir
 709 #define mark_as_git_dir(x) /* noop */
 710 #endif
 711
 712 #ifndef get_home_directory
 713 #define get_home_directory() getenv("HOME")
 714 #endif
 715
 716 #endif