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 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  90 #include <winsock2.h>
  91 #include <windows.h>
  92 #endif
  93
  94 #include <unistd.h>
  95 #include <stdio.h>
  96 #include <sys/stat.h>
  97 #include <fcntl.h>
  98 #include <stddef.h>
  99 #include <stdlib.h>
 100 #include <stdarg.h>
 101 #include <string.h>
 102 #ifdef HAVE_STRINGS_H
 103 #include <strings.h> /* for strcasecmp() */
 104 #endif
 105 #include <errno.h>
 106 #include <limits.h>
 107 #ifdef NEEDS_SYS_PARAM_H
 108 #include <sys/param.h>
 109 #endif
 110 #include <sys/types.h>
 111 #include <dirent.h>
 112 #include <sys/time.h>
 113 #include <time.h>
 114 #include <signal.h>
 115 #ifndef USE_WILDMATCH
 116 #include <fnmatch.h>
 117 #endif
 118 #include <assert.h>
 119 #include <regex.h>
 120 #include <utime.h>
 121 #include <syslog.h>
 122 #ifndef NO_SYS_POLL_H
 123 #include <sys/poll.h>
 124 #else
 125 #include <poll.h>
 126 #endif
 127 #if defined(__MINGW32__)
 128 /* pull in Windows compatibility stuff */
 129 #include "compat/mingw.h"
 130 #elif defined(_MSC_VER)
 131 #include "compat/msvc.h"
 132 #else
 133 #include <sys/wait.h>
 134 #include <sys/resource.h>
 135 #include <sys/socket.h>
 136 #include <sys/ioctl.h>
 137 #include <termios.h>
 138 #ifndef NO_SYS_SELECT_H
 139 #include <sys/select.h>
 140 #endif
 141 #include <netinet/in.h>
 142 #include <netinet/tcp.h>
 143 #include <arpa/inet.h>
 144 #include <netdb.h>
 145 #include <pwd.h>
 146 #include <sys/un.h>
 147 #ifndef NO_INTTYPES_H
 148 #include <inttypes.h>
 149 #else
 150 #include <stdint.h>
 151 #endif
 152 #ifdef NO_INTPTR_T
 153 /*
 154  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 155  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 156  * while on IP16 and IP16L32 it is "int" (resp. "short")
 157  * Size needs to match (or exceed) 'sizeof(void *)'.
 158  * We can't take "long long" here as not everybody has it.
 159  */
 160 typedef long intptr_t;
 161 typedef unsigned long uintptr_t;
 162 #endif
 163 #if defined(__CYGWIN__)
 164 #undef _XOPEN_SOURCE
 165 #include <grp.h>
 166 #define _XOPEN_SOURCE 600
 167 #include "compat/cygwin.h"
 168 #else
 169 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 170 #include <grp.h>
 171 #define _ALL_SOURCE 1
 172 #endif
 173 #endif
 174
 175 /* used on Mac OS X */
 176 #ifdef PRECOMPOSE_UNICODE
 177 #include "compat/precompose_utf8.h"
 178 #else
 179 #define precompose_str(in,i_nfd2nfc)
 180 #define precompose_argv(c,v)
 181 #define probe_utf8_pathname_composition(a,b)
 182 #endif
 183
 184 #ifdef MKDIR_WO_TRAILING_SLASH
 185 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 186 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 187 #endif
 188
 189 #ifdef NO_STRUCT_ITIMERVAL
 190 struct itimerval {
 191         struct timeval it_interval;
 192         struct timeval it_value;
 193 }
 194 #endif
 195
 196 #ifdef NO_SETITIMER
 197 #define setitimer(which,value,ovalue)
 198 #endif
 199
 200 #ifndef NO_LIBGEN_H
 201 #include <libgen.h>
 202 #else
 203 #define basename gitbasename
 204 extern char *gitbasename(char *);
 205 #endif
 206
 207 #ifndef NO_ICONV
 208 #include <iconv.h>
 209 #endif
 210
 211 #ifndef NO_OPENSSL
 212 #include <openssl/ssl.h>
 213 #include <openssl/err.h>
 214 #endif
 215
 216 /* On most systems <limits.h> would have given us this, but
 217  * not on some systems (e.g. GNU/Hurd).
 218  */
 219 #ifndef PATH_MAX
 220 #define PATH_MAX 4096
 221 #endif
 222
 223 #ifndef PRIuMAX
 224 #define PRIuMAX "llu"
 225 #endif
 226
 227 #ifndef PRIu32
 228 #define PRIu32 "u"
 229 #endif
 230
 231 #ifndef PRIx32
 232 #define PRIx32 "x"
 233 #endif
 234
 235 #ifndef PRIo32
 236 #define PRIo32 "o"
 237 #endif
 238
 239 #ifndef PATH_SEP
 240 #define PATH_SEP ':'
 241 #endif
 242
 243 #ifdef HAVE_PATHS_H
 244 #include <paths.h>
 245 #endif
 246 #ifndef _PATH_DEFPATH
 247 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 248 #endif
 249
 250 #ifndef STRIP_EXTENSION
 251 #define STRIP_EXTENSION ""
 252 #endif
 253
 254 #ifndef has_dos_drive_prefix
 255 #define has_dos_drive_prefix(path) 0
 256 #endif
 257
 258 #ifndef is_dir_sep
 259 #define is_dir_sep(c) ((c) == '/')
 260 #endif
 261
 262 #ifndef find_last_dir_sep
 263 #define find_last_dir_sep(path) strrchr(path, '/')
 264 #endif
 265
 266 #if defined(__HP_cc) && (__HP_cc >= 61000)
 267 #define NORETURN __attribute__((noreturn))
 268 #define NORETURN_PTR
 269 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 270 #define NORETURN __attribute__((__noreturn__))
 271 #define NORETURN_PTR __attribute__((__noreturn__))
 272 #elif defined(_MSC_VER)
 273 #define NORETURN __declspec(noreturn)
 274 #define NORETURN_PTR
 275 #else
 276 #define NORETURN
 277 #define NORETURN_PTR
 278 #ifndef __attribute__
 279 #define __attribute__(x)
 280 #endif
 281 #endif
 282
 283 #include "compat/bswap.h"
 284
 285 #ifdef USE_WILDMATCH
 286 #include "wildmatch.h"
 287 #define FNM_PATHNAME WM_PATHNAME
 288 #define FNM_CASEFOLD WM_CASEFOLD
 289 #define FNM_NOMATCH  WM_NOMATCH
 290 static inline int fnmatch(const char *pattern, const char *string, int flags)
 291 {
 292         return wildmatch(pattern, string, flags, NULL);
 293 }
 294 #endif
 295
 296 /* General helper functions */
 297 extern void vreportf(const char *prefix, const char *err, va_list params);
 298 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 299 extern NORETURN void usage(const char *err);
 300 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 301 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 302 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 303 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 304 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 305
 306 /*
 307  * Let callers be aware of the constant return value; this can help
 308  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 309  * because some compilers may not support variadic macros. Since we're only
 310  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 311  * using the function as usual.
 312  */
 313 #if defined(__GNUC__) && ! defined(__clang__)
 314 #define error(...) (error(__VA_ARGS__), -1)
 315 #endif
 316
 317 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 318 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 319
 320 extern int prefixcmp(const char *str, const char *prefix);
 321 extern int suffixcmp(const char *str, const char *suffix);
 322
 323 static inline const char *skip_prefix(const char *str, const char *prefix)
 324 {
 325         size_t len = strlen(prefix);
 326         return strncmp(str, prefix, len) ? NULL : str + len;
 327 }
 328
 329 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 330
 331 #ifndef PROT_READ
 332 #define PROT_READ 1
 333 #define PROT_WRITE 2
 334 #define MAP_PRIVATE 1
 335 #endif
 336
 337 #define mmap git_mmap
 338 #define munmap git_munmap
 339 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 340 extern int git_munmap(void *start, size_t length);
 341
 342 #else /* NO_MMAP || USE_WIN32_MMAP */
 343
 344 #include <sys/mman.h>
 345
 346 #endif /* NO_MMAP || USE_WIN32_MMAP */
 347
 348 #ifdef NO_MMAP
 349
 350 /* This value must be multiple of (pagesize * 2) */
 351 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 352
 353 #else /* NO_MMAP */
 354
 355 /* This value must be multiple of (pagesize * 2) */
 356 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 357         (sizeof(void*) >= 8 \
 358                 ?  1 * 1024 * 1024 * 1024 \
 359                 : 32 * 1024 * 1024)
 360
 361 #endif /* NO_MMAP */
 362
 363 #ifndef MAP_FAILED
 364 #define MAP_FAILED ((void *)-1)
 365 #endif
 366
 367 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 368 #define on_disk_bytes(st) ((st).st_size)
 369 #else
 370 #define on_disk_bytes(st) ((st).st_blocks * 512)
 371 #endif
 372
 373 #define DEFAULT_PACKED_GIT_LIMIT \
 374         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 375
 376 #ifdef NO_PREAD
 377 #define pread git_pread
 378 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 379 #endif
 380 /*
 381  * Forward decl that will remind us if its twin in cache.h changes.
 382  * This function is used in compat/pread.c.  But we can't include
 383  * cache.h there.
 384  */
 385 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 386
 387 #ifdef NO_SETENV
 388 #define setenv gitsetenv
 389 extern int gitsetenv(const char *, const char *, int);
 390 #endif
 391
 392 #ifdef NO_MKDTEMP
 393 #define mkdtemp gitmkdtemp
 394 extern char *gitmkdtemp(char *);
 395 #endif
 396
 397 #ifdef NO_MKSTEMPS
 398 #define mkstemps gitmkstemps
 399 extern int gitmkstemps(char *, int);
 400 #endif
 401
 402 #ifdef NO_UNSETENV
 403 #define unsetenv gitunsetenv
 404 extern void gitunsetenv(const char *);
 405 #endif
 406
 407 #ifdef NO_STRCASESTR
 408 #define strcasestr gitstrcasestr
 409 extern char *gitstrcasestr(const char *haystack, const char *needle);
 410 #endif
 411
 412 #ifdef NO_STRLCPY
 413 #define strlcpy gitstrlcpy
 414 extern size_t gitstrlcpy(char *, const char *, size_t);
 415 #endif
 416
 417 #ifdef NO_STRTOUMAX
 418 #define strtoumax gitstrtoumax
 419 extern uintmax_t gitstrtoumax(const char *, char **, int);
 420 #define strtoimax gitstrtoimax
 421 extern intmax_t gitstrtoimax(const char *, char **, int);
 422 #endif
 423
 424 #ifdef NO_HSTRERROR
 425 #define hstrerror githstrerror
 426 extern const char *githstrerror(int herror);
 427 #endif
 428
 429 #ifdef NO_MEMMEM
 430 #define memmem gitmemmem
 431 void *gitmemmem(const void *haystack, size_t haystacklen,
 432                 const void *needle, size_t needlelen);
 433 #endif
 434
 435 #ifdef NO_GETPAGESIZE
 436 #define getpagesize() sysconf(_SC_PAGESIZE)
 437 #endif
 438
 439 #ifdef FREAD_READS_DIRECTORIES
 440 #ifdef fopen
 441 #undef fopen
 442 #endif
 443 #define fopen(a,b) git_fopen(a,b)
 444 extern FILE *git_fopen(const char*, const char*);
 445 #endif
 446
 447 #ifdef SNPRINTF_RETURNS_BOGUS
 448 #define snprintf git_snprintf
 449 extern int git_snprintf(char *str, size_t maxsize,
 450                         const char *format, ...);
 451 #define vsnprintf git_vsnprintf
 452 extern int git_vsnprintf(char *str, size_t maxsize,
 453                          const char *format, va_list ap);
 454 #endif
 455
 456 #ifdef __GLIBC_PREREQ
 457 #if __GLIBC_PREREQ(2, 1)
 458 #define HAVE_STRCHRNUL
 459 #define HAVE_MEMPCPY
 460 #endif
 461 #endif
 462
 463 #ifndef HAVE_STRCHRNUL
 464 #define strchrnul gitstrchrnul
 465 static inline char *gitstrchrnul(const char *s, int c)
 466 {
 467         while (*s && *s != c)
 468                 s++;
 469         return (char *)s;
 470 }
 471 #endif
 472
 473 #ifndef HAVE_MEMPCPY
 474 #define mempcpy gitmempcpy
 475 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 476 {
 477         return (char *)memcpy(dest, src, n) + n;
 478 }
 479 #endif
 480
 481 #ifdef NO_INET_PTON
 482 int inet_pton(int af, const char *src, void *dst);
 483 #endif
 484
 485 #ifdef NO_INET_NTOP
 486 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 487 #endif
 488
 489 extern void release_pack_memory(size_t, int);
 490
 491 typedef void (*try_to_free_t)(size_t);
 492 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 493
 494 extern char *xstrdup(const char *str);
 495 extern void *xmalloc(size_t size);
 496 extern void *xmallocz(size_t size);
 497 extern void *xmemdupz(const void *data, size_t len);
 498 extern char *xstrndup(const char *str, size_t len);
 499 extern void *xrealloc(void *ptr, size_t size);
 500 extern void *xcalloc(size_t nmemb, size_t size);
 501 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 502 extern ssize_t xread(int fd, void *buf, size_t len);
 503 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 504 extern int xdup(int fd);
 505 extern FILE *xfdopen(int fd, const char *mode);
 506 extern int xmkstemp(char *template);
 507 extern int xmkstemp_mode(char *template, int mode);
 508 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 509 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 510
 511 static inline size_t xsize_t(off_t len)
 512 {
 513         if (len > (size_t) len)
 514                 die("Cannot handle files this big");
 515         return (size_t)len;
 516 }
 517
 518 static inline int has_extension(const char *filename, const char *ext)
 519 {
 520         size_t len = strlen(filename);
 521         size_t extlen = strlen(ext);
 522         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 523 }
 524
 525 /* in ctype.c, for kwset users */
 526 extern const char tolower_trans_tbl[256];
 527
 528 /* Sane ctype - no locale, and works with signed chars */
 529 #undef isascii
 530 #undef isspace
 531 #undef isdigit
 532 #undef isalpha
 533 #undef isalnum
 534 #undef isprint
 535 #undef islower
 536 #undef isupper
 537 #undef tolower
 538 #undef toupper
 539 #undef iscntrl
 540 #undef ispunct
 541 #undef isxdigit
 542
 543 extern const unsigned char sane_ctype[256];
 544 #define GIT_SPACE 0x01
 545 #define GIT_DIGIT 0x02
 546 #define GIT_ALPHA 0x04
 547 #define GIT_GLOB_SPECIAL 0x08
 548 #define GIT_REGEX_SPECIAL 0x10
 549 #define GIT_PATHSPEC_MAGIC 0x20
 550 #define GIT_CNTRL 0x40
 551 #define GIT_PUNCT 0x80
 552 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 553 #define isascii(x) (((x) & ~0x7f) == 0)
 554 #define isspace(x) sane_istest(x,GIT_SPACE)
 555 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 556 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 557 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 558 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 559 #define islower(x) sane_iscase(x, 1)
 560 #define isupper(x) sane_iscase(x, 0)
 561 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 562 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 563 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 564 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 565                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 566 #define isxdigit(x) (hexval_table[x] != -1)
 567 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 568 #define toupper(x) sane_case((unsigned char)(x), 0)
 569 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 570
 571 static inline int sane_case(int x, int high)
 572 {
 573         if (sane_istest(x, GIT_ALPHA))
 574                 x = (x & ~0x20) | high;
 575         return x;
 576 }
 577
 578 static inline int sane_iscase(int x, int is_lower)
 579 {
 580         if (!sane_istest(x, GIT_ALPHA))
 581                 return 0;
 582
 583         if (is_lower)
 584                 return (x & 0x20) != 0;
 585         else
 586                 return (x & 0x20) == 0;
 587 }
 588
 589 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 590 {
 591         unsigned long ul;
 592         char *p;
 593
 594         errno = 0;
 595         ul = strtoul(s, &p, base);
 596         if (errno || *p || p == s || (unsigned int) ul != ul)
 597                 return -1;
 598         *result = ul;
 599         return 0;
 600 }
 601
 602 static inline int strtol_i(char const *s, int base, int *result)
 603 {
 604         long ul;
 605         char *p;
 606
 607         errno = 0;
 608         ul = strtol(s, &p, base);
 609         if (errno || *p || p == s || (int) ul != ul)
 610                 return -1;
 611         *result = ul;
 612         return 0;
 613 }
 614
 615 #ifdef INTERNAL_QSORT
 616 void git_qsort(void *base, size_t nmemb, size_t size,
 617                int(*compar)(const void *, const void *));
 618 #define qsort git_qsort
 619 #endif
 620
 621 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 622 # define FORCE_DIR_SET_GID S_ISGID
 623 #else
 624 # define FORCE_DIR_SET_GID 0
 625 #endif
 626
 627 #ifdef NO_NSEC
 628 #undef USE_NSEC
 629 #define ST_CTIME_NSEC(st) 0
 630 #define ST_MTIME_NSEC(st) 0
 631 #else
 632 #ifdef USE_ST_TIMESPEC
 633 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 634 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 635 #else
 636 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 637 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 638 #endif
 639 #endif
 640
 641 #ifdef UNRELIABLE_FSTAT
 642 #define fstat_is_reliable() 0
 643 #else
 644 #define fstat_is_reliable() 1
 645 #endif
 646
 647 #ifndef va_copy
 648 /*
 649  * Since an obvious implementation of va_list would be to make it a
 650  * pointer into the stack frame, a simple assignment will work on
 651  * many systems.  But let's try to be more portable.
 652  */
 653 #ifdef __va_copy
 654 #define va_copy(dst, src) __va_copy(dst, src)
 655 #else
 656 #define va_copy(dst, src) ((dst) = (src))
 657 #endif
 658 #endif
 659
 660 /*
 661  * Preserves errno, prints a message, but gives no warning for ENOENT.
 662  * Always returns the return value of unlink(2).
 663  */
 664 int unlink_or_warn(const char *path);
 665 /*
 666  * Likewise for rmdir(2).
 667  */
 668 int rmdir_or_warn(const char *path);
 669 /*
 670  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 671  * the supplied file mode.
 672  */
 673 int remove_or_warn(unsigned int mode, const char *path);
 674
 675 /*
 676  * Call access(2), but warn for any error except "missing file"
 677  * (ENOENT or ENOTDIR).
 678  */
 679 int access_or_warn(const char *path, int mode);
 680 int access_or_die(const char *path, int mode);
 681
 682 /* Warn on an inaccessible file that ought to be accessible */
 683 void warn_on_inaccessible(const char *path);
 684
 685 /* Get the passwd entry for the UID of the current process. */
 686 struct passwd *xgetpwuid_self(void);
 687
 688 #endif