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