Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit fast-export: make extra_refs global (1d844ee)
   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 */
 165typedef long intptr_t;
 166typedef 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
 189ssize_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))
 195extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 196#endif
 197
 198#ifdef NO_STRUCT_ITIMERVAL
 199struct 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
 213extern 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/* The sentinel attribute is valid from gcc version 4.0 */
 304#if defined(__GNUC__) && (__GNUC__ >= 4)
 305#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 306#else
 307#define LAST_ARG_MUST_BE_NULL
 308#endif
 309
 310#include "compat/bswap.h"
 311
 312#ifdef USE_WILDMATCH
 313#include "wildmatch.h"
 314#define FNM_PATHNAME WM_PATHNAME
 315#define FNM_CASEFOLD WM_CASEFOLD
 316#define FNM_NOMATCH  WM_NOMATCH
 317static inline int fnmatch(const char *pattern, const char *string, int flags)
 318{
 319        return wildmatch(pattern, string, flags, NULL);
 320}
 321#endif
 322
 323/* General helper functions */
 324extern void vreportf(const char *prefix, const char *err, va_list params);
 325extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 326extern NORETURN void usage(const char *err);
 327extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 328extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 329extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 330extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 331extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 332
 333/*
 334 * Let callers be aware of the constant return value; this can help
 335 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 336 * because some compilers may not support variadic macros. Since we're only
 337 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 338 * using the function as usual.
 339 */
 340#if defined(__GNUC__) && ! defined(__clang__)
 341#define error(...) (error(__VA_ARGS__), -1)
 342#endif
 343
 344extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 345extern void set_error_routine(void (*routine)(const char *err, va_list params));
 346extern void set_die_is_recursing_routine(int (*routine)(void));
 347
 348extern int prefixcmp(const char *str, const char *prefix);
 349extern int suffixcmp(const char *str, const char *suffix);
 350
 351static inline const char *skip_prefix(const char *str, const char *prefix)
 352{
 353        size_t len = strlen(prefix);
 354        return strncmp(str, prefix, len) ? NULL : str + len;
 355}
 356
 357#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 358
 359#ifndef PROT_READ
 360#define PROT_READ 1
 361#define PROT_WRITE 2
 362#define MAP_PRIVATE 1
 363#endif
 364
 365#define mmap git_mmap
 366#define munmap git_munmap
 367extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 368extern int git_munmap(void *start, size_t length);
 369
 370#else /* NO_MMAP || USE_WIN32_MMAP */
 371
 372#include <sys/mman.h>
 373
 374#endif /* NO_MMAP || USE_WIN32_MMAP */
 375
 376#ifdef NO_MMAP
 377
 378/* This value must be multiple of (pagesize * 2) */
 379#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 380
 381#else /* NO_MMAP */
 382
 383/* This value must be multiple of (pagesize * 2) */
 384#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 385        (sizeof(void*) >= 8 \
 386                ?  1 * 1024 * 1024 * 1024 \
 387                : 32 * 1024 * 1024)
 388
 389#endif /* NO_MMAP */
 390
 391#ifndef MAP_FAILED
 392#define MAP_FAILED ((void *)-1)
 393#endif
 394
 395#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 396#define on_disk_bytes(st) ((st).st_size)
 397#else
 398#define on_disk_bytes(st) ((st).st_blocks * 512)
 399#endif
 400
 401#define DEFAULT_PACKED_GIT_LIMIT \
 402        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 403
 404#ifdef NO_PREAD
 405#define pread git_pread
 406extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 407#endif
 408/*
 409 * Forward decl that will remind us if its twin in cache.h changes.
 410 * This function is used in compat/pread.c.  But we can't include
 411 * cache.h there.
 412 */
 413extern ssize_t read_in_full(int fd, void *buf, size_t count);
 414
 415#ifdef NO_SETENV
 416#define setenv gitsetenv
 417extern int gitsetenv(const char *, const char *, int);
 418#endif
 419
 420#ifdef NO_MKDTEMP
 421#define mkdtemp gitmkdtemp
 422extern char *gitmkdtemp(char *);
 423#endif
 424
 425#ifdef NO_MKSTEMPS
 426#define mkstemps gitmkstemps
 427extern int gitmkstemps(char *, int);
 428#endif
 429
 430#ifdef NO_UNSETENV
 431#define unsetenv gitunsetenv
 432extern void gitunsetenv(const char *);
 433#endif
 434
 435#ifdef NO_STRCASESTR
 436#define strcasestr gitstrcasestr
 437extern char *gitstrcasestr(const char *haystack, const char *needle);
 438#endif
 439
 440#ifdef NO_STRLCPY
 441#define strlcpy gitstrlcpy
 442extern size_t gitstrlcpy(char *, const char *, size_t);
 443#endif
 444
 445#ifdef NO_STRTOUMAX
 446#define strtoumax gitstrtoumax
 447extern uintmax_t gitstrtoumax(const char *, char **, int);
 448#define strtoimax gitstrtoimax
 449extern intmax_t gitstrtoimax(const char *, char **, int);
 450#endif
 451
 452#ifdef NO_HSTRERROR
 453#define hstrerror githstrerror
 454extern const char *githstrerror(int herror);
 455#endif
 456
 457#ifdef NO_MEMMEM
 458#define memmem gitmemmem
 459void *gitmemmem(const void *haystack, size_t haystacklen,
 460                const void *needle, size_t needlelen);
 461#endif
 462
 463#ifdef NO_GETPAGESIZE
 464#define getpagesize() sysconf(_SC_PAGESIZE)
 465#endif
 466
 467#ifdef FREAD_READS_DIRECTORIES
 468#ifdef fopen
 469#undef fopen
 470#endif
 471#define fopen(a,b) git_fopen(a,b)
 472extern FILE *git_fopen(const char*, const char*);
 473#endif
 474
 475#ifdef SNPRINTF_RETURNS_BOGUS
 476#define snprintf git_snprintf
 477extern int git_snprintf(char *str, size_t maxsize,
 478                        const char *format, ...);
 479#define vsnprintf git_vsnprintf
 480extern int git_vsnprintf(char *str, size_t maxsize,
 481                         const char *format, va_list ap);
 482#endif
 483
 484#ifdef __GLIBC_PREREQ
 485#if __GLIBC_PREREQ(2, 1)
 486#define HAVE_STRCHRNUL
 487#define HAVE_MEMPCPY
 488#endif
 489#endif
 490
 491#ifndef HAVE_STRCHRNUL
 492#define strchrnul gitstrchrnul
 493static inline char *gitstrchrnul(const char *s, int c)
 494{
 495        while (*s && *s != c)
 496                s++;
 497        return (char *)s;
 498}
 499#endif
 500
 501#ifndef HAVE_MEMPCPY
 502#define mempcpy gitmempcpy
 503static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 504{
 505        return (char *)memcpy(dest, src, n) + n;
 506}
 507#endif
 508
 509#ifdef NO_INET_PTON
 510int inet_pton(int af, const char *src, void *dst);
 511#endif
 512
 513#ifdef NO_INET_NTOP
 514const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 515#endif
 516
 517extern void release_pack_memory(size_t, int);
 518
 519typedef void (*try_to_free_t)(size_t);
 520extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 521
 522extern char *xstrdup(const char *str);
 523extern void *xmalloc(size_t size);
 524extern void *xmallocz(size_t size);
 525extern void *xmemdupz(const void *data, size_t len);
 526extern char *xstrndup(const char *str, size_t len);
 527extern void *xrealloc(void *ptr, size_t size);
 528extern void *xcalloc(size_t nmemb, size_t size);
 529extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 530extern ssize_t xread(int fd, void *buf, size_t len);
 531extern ssize_t xwrite(int fd, const void *buf, size_t len);
 532extern int xdup(int fd);
 533extern FILE *xfdopen(int fd, const char *mode);
 534extern int xmkstemp(char *template);
 535extern int xmkstemp_mode(char *template, int mode);
 536extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 537extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 538
 539static inline size_t xsize_t(off_t len)
 540{
 541        if (len > (size_t) len)
 542                die("Cannot handle files this big");
 543        return (size_t)len;
 544}
 545
 546static inline int has_extension(const char *filename, const char *ext)
 547{
 548        size_t len = strlen(filename);
 549        size_t extlen = strlen(ext);
 550        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 551}
 552
 553/* in ctype.c, for kwset users */
 554extern const char tolower_trans_tbl[256];
 555
 556/* Sane ctype - no locale, and works with signed chars */
 557#undef isascii
 558#undef isspace
 559#undef isdigit
 560#undef isalpha
 561#undef isalnum
 562#undef isprint
 563#undef islower
 564#undef isupper
 565#undef tolower
 566#undef toupper
 567#undef iscntrl
 568#undef ispunct
 569#undef isxdigit
 570
 571extern const unsigned char sane_ctype[256];
 572#define GIT_SPACE 0x01
 573#define GIT_DIGIT 0x02
 574#define GIT_ALPHA 0x04
 575#define GIT_GLOB_SPECIAL 0x08
 576#define GIT_REGEX_SPECIAL 0x10
 577#define GIT_PATHSPEC_MAGIC 0x20
 578#define GIT_CNTRL 0x40
 579#define GIT_PUNCT 0x80
 580#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 581#define isascii(x) (((x) & ~0x7f) == 0)
 582#define isspace(x) sane_istest(x,GIT_SPACE)
 583#define isdigit(x) sane_istest(x,GIT_DIGIT)
 584#define isalpha(x) sane_istest(x,GIT_ALPHA)
 585#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 586#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 587#define islower(x) sane_iscase(x, 1)
 588#define isupper(x) sane_iscase(x, 0)
 589#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 590#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 591#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 592#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 593                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 594#define isxdigit(x) (hexval_table[x] != -1)
 595#define tolower(x) sane_case((unsigned char)(x), 0x20)
 596#define toupper(x) sane_case((unsigned char)(x), 0)
 597#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 598
 599static inline int sane_case(int x, int high)
 600{
 601        if (sane_istest(x, GIT_ALPHA))
 602                x = (x & ~0x20) | high;
 603        return x;
 604}
 605
 606static inline int sane_iscase(int x, int is_lower)
 607{
 608        if (!sane_istest(x, GIT_ALPHA))
 609                return 0;
 610
 611        if (is_lower)
 612                return (x & 0x20) != 0;
 613        else
 614                return (x & 0x20) == 0;
 615}
 616
 617static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 618{
 619        unsigned long ul;
 620        char *p;
 621
 622        errno = 0;
 623        ul = strtoul(s, &p, base);
 624        if (errno || *p || p == s || (unsigned int) ul != ul)
 625                return -1;
 626        *result = ul;
 627        return 0;
 628}
 629
 630static inline int strtol_i(char const *s, int base, int *result)
 631{
 632        long ul;
 633        char *p;
 634
 635        errno = 0;
 636        ul = strtol(s, &p, base);
 637        if (errno || *p || p == s || (int) ul != ul)
 638                return -1;
 639        *result = ul;
 640        return 0;
 641}
 642
 643#ifdef INTERNAL_QSORT
 644void git_qsort(void *base, size_t nmemb, size_t size,
 645               int(*compar)(const void *, const void *));
 646#define qsort git_qsort
 647#endif
 648
 649#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 650# define FORCE_DIR_SET_GID S_ISGID
 651#else
 652# define FORCE_DIR_SET_GID 0
 653#endif
 654
 655#ifdef NO_NSEC
 656#undef USE_NSEC
 657#define ST_CTIME_NSEC(st) 0
 658#define ST_MTIME_NSEC(st) 0
 659#else
 660#ifdef USE_ST_TIMESPEC
 661#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 662#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 663#else
 664#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 665#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 666#endif
 667#endif
 668
 669#ifdef UNRELIABLE_FSTAT
 670#define fstat_is_reliable() 0
 671#else
 672#define fstat_is_reliable() 1
 673#endif
 674
 675#ifndef va_copy
 676/*
 677 * Since an obvious implementation of va_list would be to make it a
 678 * pointer into the stack frame, a simple assignment will work on
 679 * many systems.  But let's try to be more portable.
 680 */
 681#ifdef __va_copy
 682#define va_copy(dst, src) __va_copy(dst, src)
 683#else
 684#define va_copy(dst, src) ((dst) = (src))
 685#endif
 686#endif
 687
 688/*
 689 * Preserves errno, prints a message, but gives no warning for ENOENT.
 690 * Always returns the return value of unlink(2).
 691 */
 692int unlink_or_warn(const char *path);
 693/*
 694 * Likewise for rmdir(2).
 695 */
 696int rmdir_or_warn(const char *path);
 697/*
 698 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 699 * the supplied file mode.
 700 */
 701int remove_or_warn(unsigned int mode, const char *path);
 702
 703/*
 704 * Call access(2), but warn for any error except "missing file"
 705 * (ENOENT or ENOTDIR).
 706 */
 707#define ACCESS_EACCES_OK (1U << 0)
 708int access_or_warn(const char *path, int mode, unsigned flag);
 709int access_or_die(const char *path, int mode, unsigned flag);
 710
 711/* Warn on an inaccessible file that ought to be accessible */
 712void warn_on_inaccessible(const char *path);
 713
 714/* Get the passwd entry for the UID of the current process. */
 715struct passwd *xgetpwuid_self(void);
 716
 717#endif