Andrew's git / gitweb.git / git-compat-util.h
?
git-compat-util.hon commit mergetool: don't require a work tree for --tool-help (7bfb7c3)
   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__) && !defined(__MirBSD__)
  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) && !defined(_WIN32_WINNT)
  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#include <assert.h>
 120#include <regex.h>
 121#include <utime.h>
 122#include <syslog.h>
 123#ifndef NO_SYS_POLL_H
 124#include <sys/poll.h>
 125#else
 126#include <poll.h>
 127#endif
 128
 129#if defined(__MINGW32__)
 130/* pull in Windows compatibility stuff */
 131#include "compat/mingw.h"
 132#elif defined(_MSC_VER)
 133#include "compat/msvc.h"
 134#else
 135#include <sys/wait.h>
 136#include <sys/resource.h>
 137#include <sys/socket.h>
 138#include <sys/ioctl.h>
 139#include <termios.h>
 140#ifndef NO_SYS_SELECT_H
 141#include <sys/select.h>
 142#endif
 143#include <netinet/in.h>
 144#include <netinet/tcp.h>
 145#include <arpa/inet.h>
 146#include <netdb.h>
 147#include <pwd.h>
 148#include <sys/un.h>
 149#ifndef NO_INTTYPES_H
 150#include <inttypes.h>
 151#else
 152#include <stdint.h>
 153#endif
 154#ifdef NO_INTPTR_T
 155/*
 156 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 157 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 158 * while on IP16 and IP16L32 it is "int" (resp. "short")
 159 * Size needs to match (or exceed) 'sizeof(void *)'.
 160 * We can't take "long long" here as not everybody has it.
 161 */
 162typedef long intptr_t;
 163typedef unsigned long uintptr_t;
 164#endif
 165#if defined(__CYGWIN__)
 166#undef _XOPEN_SOURCE
 167#include <grp.h>
 168#define _XOPEN_SOURCE 600
 169#else
 170#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 171#include <grp.h>
 172#define _ALL_SOURCE 1
 173#endif
 174#endif
 175
 176/* used on Mac OS X */
 177#ifdef PRECOMPOSE_UNICODE
 178#include "compat/precompose_utf8.h"
 179#else
 180#define precompose_str(in,i_nfd2nfc)
 181#define precompose_argv(c,v)
 182#define probe_utf8_pathname_composition(a,b)
 183#endif
 184
 185#ifdef MKDIR_WO_TRAILING_SLASH
 186#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 187extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 188#endif
 189
 190#ifdef NO_STRUCT_ITIMERVAL
 191struct itimerval {
 192        struct timeval it_interval;
 193        struct timeval it_value;
 194}
 195#endif
 196
 197#ifdef NO_SETITIMER
 198#define setitimer(which,value,ovalue)
 199#endif
 200
 201#ifndef NO_LIBGEN_H
 202#include <libgen.h>
 203#else
 204#define basename gitbasename
 205extern char *gitbasename(char *);
 206#endif
 207
 208#ifndef NO_ICONV
 209#include <iconv.h>
 210#endif
 211
 212#ifndef NO_OPENSSL
 213#include <openssl/ssl.h>
 214#include <openssl/err.h>
 215#endif
 216
 217/* On most systems <netdb.h> would have given us this, but
 218 * not on some systems (e.g. z/OS).
 219 */
 220#ifndef NI_MAXHOST
 221#define NI_MAXHOST 1025
 222#endif
 223
 224#ifndef NI_MAXSERV
 225#define NI_MAXSERV 32
 226#endif
 227
 228/* On most systems <limits.h> would have given us this, but
 229 * not on some systems (e.g. GNU/Hurd).
 230 */
 231#ifndef PATH_MAX
 232#define PATH_MAX 4096
 233#endif
 234
 235#ifndef PRIuMAX
 236#define PRIuMAX "llu"
 237#endif
 238
 239#ifndef PRIu32
 240#define PRIu32 "u"
 241#endif
 242
 243#ifndef PRIx32
 244#define PRIx32 "x"
 245#endif
 246
 247#ifndef PRIo32
 248#define PRIo32 "o"
 249#endif
 250
 251#ifndef PATH_SEP
 252#define PATH_SEP ':'
 253#endif
 254
 255#ifdef HAVE_PATHS_H
 256#include <paths.h>
 257#endif
 258#ifndef _PATH_DEFPATH
 259#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 260#endif
 261
 262#ifndef STRIP_EXTENSION
 263#define STRIP_EXTENSION ""
 264#endif
 265
 266#ifndef has_dos_drive_prefix
 267#define has_dos_drive_prefix(path) 0
 268#endif
 269
 270#ifndef is_dir_sep
 271#define is_dir_sep(c) ((c) == '/')
 272#endif
 273
 274#ifndef find_last_dir_sep
 275#define find_last_dir_sep(path) strrchr(path, '/')
 276#endif
 277
 278#if defined(__HP_cc) && (__HP_cc >= 61000)
 279#define NORETURN __attribute__((noreturn))
 280#define NORETURN_PTR
 281#elif defined(__GNUC__) && !defined(NO_NORETURN)
 282#define NORETURN __attribute__((__noreturn__))
 283#define NORETURN_PTR __attribute__((__noreturn__))
 284#elif defined(_MSC_VER)
 285#define NORETURN __declspec(noreturn)
 286#define NORETURN_PTR
 287#else
 288#define NORETURN
 289#define NORETURN_PTR
 290#ifndef __attribute__
 291#define __attribute__(x)
 292#endif
 293#endif
 294
 295/* The sentinel attribute is valid from gcc version 4.0 */
 296#if defined(__GNUC__) && (__GNUC__ >= 4)
 297#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 298#else
 299#define LAST_ARG_MUST_BE_NULL
 300#endif
 301
 302#include "compat/bswap.h"
 303
 304#include "wildmatch.h"
 305
 306/* General helper functions */
 307extern void vreportf(const char *prefix, const char *err, va_list params);
 308extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 309extern NORETURN void usage(const char *err);
 310extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 311extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 312extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 313extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 314extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 315
 316#ifndef NO_OPENSSL
 317#ifdef APPLE_COMMON_CRYPTO
 318#include "compat/apple-common-crypto.h"
 319#else
 320#include <openssl/evp.h>
 321#include <openssl/hmac.h>
 322#endif /* APPLE_COMMON_CRYPTO */
 323#include <openssl/x509v3.h>
 324#endif /* NO_OPENSSL */
 325
 326/*
 327 * Let callers be aware of the constant return value; this can help
 328 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 329 * because some compilers may not support variadic macros. Since we're only
 330 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 331 * using the function as usual.
 332 */
 333#if defined(__GNUC__) && ! defined(__clang__)
 334#define error(...) (error(__VA_ARGS__), -1)
 335#endif
 336
 337extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 338extern void set_error_routine(void (*routine)(const char *err, va_list params));
 339extern void set_die_is_recursing_routine(int (*routine)(void));
 340
 341extern int starts_with(const char *str, const char *prefix);
 342extern int ends_with(const char *str, const char *suffix);
 343
 344static inline const char *skip_prefix(const char *str, const char *prefix)
 345{
 346        do {
 347                if (!*prefix)
 348                        return str;
 349        } while (*str++ == *prefix++);
 350        return NULL;
 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
 363extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 364extern 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
 402extern 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 */
 409extern ssize_t read_in_full(int fd, void *buf, size_t count);
 410
 411#ifdef NO_SETENV
 412#define setenv gitsetenv
 413extern int gitsetenv(const char *, const char *, int);
 414#endif
 415
 416#ifdef NO_MKDTEMP
 417#define mkdtemp gitmkdtemp
 418extern char *gitmkdtemp(char *);
 419#endif
 420
 421#ifdef NO_MKSTEMPS
 422#define mkstemps gitmkstemps
 423extern int gitmkstemps(char *, int);
 424#endif
 425
 426#ifdef NO_UNSETENV
 427#define unsetenv gitunsetenv
 428extern void gitunsetenv(const char *);
 429#endif
 430
 431#ifdef NO_STRCASESTR
 432#define strcasestr gitstrcasestr
 433extern char *gitstrcasestr(const char *haystack, const char *needle);
 434#endif
 435
 436#ifdef NO_STRLCPY
 437#define strlcpy gitstrlcpy
 438extern size_t gitstrlcpy(char *, const char *, size_t);
 439#endif
 440
 441#ifdef NO_STRTOUMAX
 442#define strtoumax gitstrtoumax
 443extern uintmax_t gitstrtoumax(const char *, char **, int);
 444#define strtoimax gitstrtoimax
 445extern intmax_t gitstrtoimax(const char *, char **, int);
 446#endif
 447
 448#ifdef NO_HSTRERROR
 449#define hstrerror githstrerror
 450extern const char *githstrerror(int herror);
 451#endif
 452
 453#ifdef NO_MEMMEM
 454#define memmem gitmemmem
 455void *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)
 468extern FILE *git_fopen(const char*, const char*);
 469#endif
 470
 471#ifdef SNPRINTF_RETURNS_BOGUS
 472#ifdef snprintf
 473#undef snprintf
 474#endif
 475#define snprintf git_snprintf
 476extern int git_snprintf(char *str, size_t maxsize,
 477                        const char *format, ...);
 478#ifdef vsnprintf
 479#undef vsnprintf
 480#endif
 481#define vsnprintf git_vsnprintf
 482extern int git_vsnprintf(char *str, size_t maxsize,
 483                         const char *format, va_list ap);
 484#endif
 485
 486#ifdef __GLIBC_PREREQ
 487#if __GLIBC_PREREQ(2, 1)
 488#define HAVE_STRCHRNUL
 489#define HAVE_MEMPCPY
 490#endif
 491#endif
 492
 493#ifndef HAVE_STRCHRNUL
 494#define strchrnul gitstrchrnul
 495static inline char *gitstrchrnul(const char *s, int c)
 496{
 497        while (*s && *s != c)
 498                s++;
 499        return (char *)s;
 500}
 501#endif
 502
 503#ifndef HAVE_MEMPCPY
 504#define mempcpy gitmempcpy
 505static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 506{
 507        return (char *)memcpy(dest, src, n) + n;
 508}
 509#endif
 510
 511#ifdef NO_INET_PTON
 512int inet_pton(int af, const char *src, void *dst);
 513#endif
 514
 515#ifdef NO_INET_NTOP
 516const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 517#endif
 518
 519extern void release_pack_memory(size_t);
 520
 521typedef void (*try_to_free_t)(size_t);
 522extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 523
 524extern char *xstrdup(const char *str);
 525extern void *xmalloc(size_t size);
 526extern void *xmallocz(size_t size);
 527extern void *xmemdupz(const void *data, size_t len);
 528extern char *xstrndup(const char *str, size_t len);
 529extern void *xrealloc(void *ptr, size_t size);
 530extern void *xcalloc(size_t nmemb, size_t size);
 531extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 532extern ssize_t xread(int fd, void *buf, size_t len);
 533extern ssize_t xwrite(int fd, const void *buf, size_t len);
 534extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 535extern int xdup(int fd);
 536extern FILE *xfdopen(int fd, const char *mode);
 537extern int xmkstemp(char *template);
 538extern int xmkstemp_mode(char *template, int mode);
 539extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 540extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 541
 542static inline size_t xsize_t(off_t len)
 543{
 544        if (len > (size_t) len)
 545                die("Cannot handle files this big");
 546        return (size_t)len;
 547}
 548
 549static inline int has_extension(const char *filename, const char *ext)
 550{
 551        size_t len = strlen(filename);
 552        size_t extlen = strlen(ext);
 553        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 554}
 555
 556/* in ctype.c, for kwset users */
 557extern const char tolower_trans_tbl[256];
 558
 559/* Sane ctype - no locale, and works with signed chars */
 560#undef isascii
 561#undef isspace
 562#undef isdigit
 563#undef isalpha
 564#undef isalnum
 565#undef isprint
 566#undef islower
 567#undef isupper
 568#undef tolower
 569#undef toupper
 570#undef iscntrl
 571#undef ispunct
 572#undef isxdigit
 573
 574extern const unsigned char sane_ctype[256];
 575#define GIT_SPACE 0x01
 576#define GIT_DIGIT 0x02
 577#define GIT_ALPHA 0x04
 578#define GIT_GLOB_SPECIAL 0x08
 579#define GIT_REGEX_SPECIAL 0x10
 580#define GIT_PATHSPEC_MAGIC 0x20
 581#define GIT_CNTRL 0x40
 582#define GIT_PUNCT 0x80
 583#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 584#define isascii(x) (((x) & ~0x7f) == 0)
 585#define isspace(x) sane_istest(x,GIT_SPACE)
 586#define isdigit(x) sane_istest(x,GIT_DIGIT)
 587#define isalpha(x) sane_istest(x,GIT_ALPHA)
 588#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 589#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 590#define islower(x) sane_iscase(x, 1)
 591#define isupper(x) sane_iscase(x, 0)
 592#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 593#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 594#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 595#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 596                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 597#define isxdigit(x) (hexval_table[x] != -1)
 598#define tolower(x) sane_case((unsigned char)(x), 0x20)
 599#define toupper(x) sane_case((unsigned char)(x), 0)
 600#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 601
 602static inline int sane_case(int x, int high)
 603{
 604        if (sane_istest(x, GIT_ALPHA))
 605                x = (x & ~0x20) | high;
 606        return x;
 607}
 608
 609static inline int sane_iscase(int x, int is_lower)
 610{
 611        if (!sane_istest(x, GIT_ALPHA))
 612                return 0;
 613
 614        if (is_lower)
 615                return (x & 0x20) != 0;
 616        else
 617                return (x & 0x20) == 0;
 618}
 619
 620static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 621{
 622        unsigned long ul;
 623        char *p;
 624
 625        errno = 0;
 626        ul = strtoul(s, &p, base);
 627        if (errno || *p || p == s || (unsigned int) ul != ul)
 628                return -1;
 629        *result = ul;
 630        return 0;
 631}
 632
 633static inline int strtol_i(char const *s, int base, int *result)
 634{
 635        long ul;
 636        char *p;
 637
 638        errno = 0;
 639        ul = strtol(s, &p, base);
 640        if (errno || *p || p == s || (int) ul != ul)
 641                return -1;
 642        *result = ul;
 643        return 0;
 644}
 645
 646#ifdef INTERNAL_QSORT
 647void git_qsort(void *base, size_t nmemb, size_t size,
 648               int(*compar)(const void *, const void *));
 649#define qsort git_qsort
 650#endif
 651
 652#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 653# define FORCE_DIR_SET_GID S_ISGID
 654#else
 655# define FORCE_DIR_SET_GID 0
 656#endif
 657
 658#ifdef NO_NSEC
 659#undef USE_NSEC
 660#define ST_CTIME_NSEC(st) 0
 661#define ST_MTIME_NSEC(st) 0
 662#else
 663#ifdef USE_ST_TIMESPEC
 664#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 665#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 666#else
 667#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 668#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 669#endif
 670#endif
 671
 672#ifdef UNRELIABLE_FSTAT
 673#define fstat_is_reliable() 0
 674#else
 675#define fstat_is_reliable() 1
 676#endif
 677
 678#ifndef va_copy
 679/*
 680 * Since an obvious implementation of va_list would be to make it a
 681 * pointer into the stack frame, a simple assignment will work on
 682 * many systems.  But let's try to be more portable.
 683 */
 684#ifdef __va_copy
 685#define va_copy(dst, src) __va_copy(dst, src)
 686#else
 687#define va_copy(dst, src) ((dst) = (src))
 688#endif
 689#endif
 690
 691/*
 692 * Preserves errno, prints a message, but gives no warning for ENOENT.
 693 * Always returns the return value of unlink(2).
 694 */
 695int unlink_or_warn(const char *path);
 696/*
 697 * Likewise for rmdir(2).
 698 */
 699int rmdir_or_warn(const char *path);
 700/*
 701 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 702 * the supplied file mode.
 703 */
 704int remove_or_warn(unsigned int mode, const char *path);
 705
 706/*
 707 * Call access(2), but warn for any error except "missing file"
 708 * (ENOENT or ENOTDIR).
 709 */
 710#define ACCESS_EACCES_OK (1U << 0)
 711int access_or_warn(const char *path, int mode, unsigned flag);
 712int access_or_die(const char *path, int mode, unsigned flag);
 713
 714/* Warn on an inaccessible file that ought to be accessible */
 715void warn_on_inaccessible(const char *path);
 716
 717/* Get the passwd entry for the UID of the current process. */
 718struct passwd *xgetpwuid_self(void);
 719
 720#ifdef GMTIME_UNRELIABLE_ERRORS
 721struct tm *git_gmtime(const time_t *);
 722struct tm *git_gmtime_r(const time_t *, struct tm *);
 723#define gmtime git_gmtime
 724#define gmtime_r git_gmtime_r
 725#endif
 726
 727#endif