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