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