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