Andrew's git / gitweb.git / git-compat-util.h
?
git-compat-util.hon commit imap-send: use Apple's Security framework for base64 encoding (3ef2bca)
   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
 131#ifndef NO_OPENSSL
 132#ifdef APPLE_COMMON_CRYPTO
 133#include "compat/apple-common-crypto.h"
 134#else
 135#include <openssl/evp.h>
 136#include <openssl/hmac.h>
 137#endif /* APPLE_COMMON_CRYPTO */
 138#include <openssl/x509v3.h>
 139#endif /* NO_OPENSSL */
 140
 141#if defined(__MINGW32__)
 142/* pull in Windows compatibility stuff */
 143#include "compat/mingw.h"
 144#elif defined(_MSC_VER)
 145#include "compat/msvc.h"
 146#else
 147#include <sys/wait.h>
 148#include <sys/resource.h>
 149#include <sys/socket.h>
 150#include <sys/ioctl.h>
 151#include <termios.h>
 152#ifndef NO_SYS_SELECT_H
 153#include <sys/select.h>
 154#endif
 155#include <netinet/in.h>
 156#include <netinet/tcp.h>
 157#include <arpa/inet.h>
 158#include <netdb.h>
 159#include <pwd.h>
 160#include <sys/un.h>
 161#ifndef NO_INTTYPES_H
 162#include <inttypes.h>
 163#else
 164#include <stdint.h>
 165#endif
 166#ifdef NO_INTPTR_T
 167/*
 168 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 169 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 170 * while on IP16 and IP16L32 it is "int" (resp. "short")
 171 * Size needs to match (or exceed) 'sizeof(void *)'.
 172 * We can't take "long long" here as not everybody has it.
 173 */
 174typedef long intptr_t;
 175typedef unsigned long uintptr_t;
 176#endif
 177int get_st_mode_bits(const char *path, int *mode);
 178#if defined(__CYGWIN__)
 179#undef _XOPEN_SOURCE
 180#include <grp.h>
 181#define _XOPEN_SOURCE 600
 182#include "compat/cygwin.h"
 183#else
 184#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 185#include <grp.h>
 186#define _ALL_SOURCE 1
 187#endif
 188#endif
 189
 190/* used on Mac OS X */
 191#ifdef PRECOMPOSE_UNICODE
 192#include "compat/precompose_utf8.h"
 193#else
 194#define precompose_str(in,i_nfd2nfc)
 195#define precompose_argv(c,v)
 196#define probe_utf8_pathname_composition(a,b)
 197#endif
 198
 199#ifdef MKDIR_WO_TRAILING_SLASH
 200#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 201extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 202#endif
 203
 204#ifdef NO_STRUCT_ITIMERVAL
 205struct itimerval {
 206        struct timeval it_interval;
 207        struct timeval it_value;
 208}
 209#endif
 210
 211#ifdef NO_SETITIMER
 212#define setitimer(which,value,ovalue)
 213#endif
 214
 215#ifndef NO_LIBGEN_H
 216#include <libgen.h>
 217#else
 218#define basename gitbasename
 219extern char *gitbasename(char *);
 220#endif
 221
 222#ifndef NO_ICONV
 223#include <iconv.h>
 224#endif
 225
 226#ifndef NO_OPENSSL
 227#include <openssl/ssl.h>
 228#include <openssl/err.h>
 229#endif
 230
 231/* On most systems <netdb.h> would have given us this, but
 232 * not on some systems (e.g. z/OS).
 233 */
 234#ifndef NI_MAXHOST
 235#define NI_MAXHOST 1025
 236#endif
 237
 238#ifndef NI_MAXSERV
 239#define NI_MAXSERV 32
 240#endif
 241
 242/* On most systems <limits.h> would have given us this, but
 243 * not on some systems (e.g. GNU/Hurd).
 244 */
 245#ifndef PATH_MAX
 246#define PATH_MAX 4096
 247#endif
 248
 249#ifndef PRIuMAX
 250#define PRIuMAX "llu"
 251#endif
 252
 253#ifndef PRIu32
 254#define PRIu32 "u"
 255#endif
 256
 257#ifndef PRIx32
 258#define PRIx32 "x"
 259#endif
 260
 261#ifndef PRIo32
 262#define PRIo32 "o"
 263#endif
 264
 265#ifndef PATH_SEP
 266#define PATH_SEP ':'
 267#endif
 268
 269#ifdef HAVE_PATHS_H
 270#include <paths.h>
 271#endif
 272#ifndef _PATH_DEFPATH
 273#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 274#endif
 275
 276#ifndef STRIP_EXTENSION
 277#define STRIP_EXTENSION ""
 278#endif
 279
 280#ifndef has_dos_drive_prefix
 281#define has_dos_drive_prefix(path) 0
 282#endif
 283
 284#ifndef is_dir_sep
 285#define is_dir_sep(c) ((c) == '/')
 286#endif
 287
 288#ifndef find_last_dir_sep
 289#define find_last_dir_sep(path) strrchr(path, '/')
 290#endif
 291
 292#if defined(__HP_cc) && (__HP_cc >= 61000)
 293#define NORETURN __attribute__((noreturn))
 294#define NORETURN_PTR
 295#elif defined(__GNUC__) && !defined(NO_NORETURN)
 296#define NORETURN __attribute__((__noreturn__))
 297#define NORETURN_PTR __attribute__((__noreturn__))
 298#elif defined(_MSC_VER)
 299#define NORETURN __declspec(noreturn)
 300#define NORETURN_PTR
 301#else
 302#define NORETURN
 303#define NORETURN_PTR
 304#ifndef __attribute__
 305#define __attribute__(x)
 306#endif
 307#endif
 308
 309#include "compat/bswap.h"
 310
 311#ifdef USE_WILDMATCH
 312#include "wildmatch.h"
 313#define FNM_PATHNAME WM_PATHNAME
 314#define FNM_CASEFOLD WM_CASEFOLD
 315#define FNM_NOMATCH  WM_NOMATCH
 316static inline int fnmatch(const char *pattern, const char *string, int flags)
 317{
 318        return wildmatch(pattern, string, flags, NULL);
 319}
 320#endif
 321
 322/* General helper functions */
 323extern void vreportf(const char *prefix, const char *err, va_list params);
 324extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 325extern NORETURN void usage(const char *err);
 326extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 327extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 328extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 329extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 330extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 331
 332/*
 333 * Let callers be aware of the constant return value; this can help
 334 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 335 * because some compilers may not support variadic macros. Since we're only
 336 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 337 * using the function as usual.
 338 */
 339#if defined(__GNUC__) && ! defined(__clang__)
 340#define error(...) (error(__VA_ARGS__), -1)
 341#endif
 342
 343extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 344extern void set_error_routine(void (*routine)(const char *err, va_list params));
 345extern void set_die_is_recursing_routine(int (*routine)(void));
 346
 347extern int prefixcmp(const char *str, const char *prefix);
 348extern int suffixcmp(const char *str, const char *suffix);
 349
 350static inline const char *skip_prefix(const char *str, const char *prefix)
 351{
 352        size_t len = strlen(prefix);
 353        return strncmp(str, prefix, len) ? NULL : str + len;
 354}
 355
 356#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 357
 358#ifndef PROT_READ
 359#define PROT_READ 1
 360#define PROT_WRITE 2
 361#define MAP_PRIVATE 1
 362#endif
 363
 364#define mmap git_mmap
 365#define munmap git_munmap
 366extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 367extern int git_munmap(void *start, size_t length);
 368
 369#else /* NO_MMAP || USE_WIN32_MMAP */
 370
 371#include <sys/mman.h>
 372
 373#endif /* NO_MMAP || USE_WIN32_MMAP */
 374
 375#ifdef NO_MMAP
 376
 377/* This value must be multiple of (pagesize * 2) */
 378#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 379
 380#else /* NO_MMAP */
 381
 382/* This value must be multiple of (pagesize * 2) */
 383#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 384        (sizeof(void*) >= 8 \
 385                ?  1 * 1024 * 1024 * 1024 \
 386                : 32 * 1024 * 1024)
 387
 388#endif /* NO_MMAP */
 389
 390#ifndef MAP_FAILED
 391#define MAP_FAILED ((void *)-1)
 392#endif
 393
 394#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 395#define on_disk_bytes(st) ((st).st_size)
 396#else
 397#define on_disk_bytes(st) ((st).st_blocks * 512)
 398#endif
 399
 400#define DEFAULT_PACKED_GIT_LIMIT \
 401        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 402
 403#ifdef NO_PREAD
 404#define pread git_pread
 405extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 406#endif
 407/*
 408 * Forward decl that will remind us if its twin in cache.h changes.
 409 * This function is used in compat/pread.c.  But we can't include
 410 * cache.h there.
 411 */
 412extern ssize_t read_in_full(int fd, void *buf, size_t count);
 413
 414#ifdef NO_SETENV
 415#define setenv gitsetenv
 416extern int gitsetenv(const char *, const char *, int);
 417#endif
 418
 419#ifdef NO_MKDTEMP
 420#define mkdtemp gitmkdtemp
 421extern char *gitmkdtemp(char *);
 422#endif
 423
 424#ifdef NO_MKSTEMPS
 425#define mkstemps gitmkstemps
 426extern int gitmkstemps(char *, int);
 427#endif
 428
 429#ifdef NO_UNSETENV
 430#define unsetenv gitunsetenv
 431extern void gitunsetenv(const char *);
 432#endif
 433
 434#ifdef NO_STRCASESTR
 435#define strcasestr gitstrcasestr
 436extern char *gitstrcasestr(const char *haystack, const char *needle);
 437#endif
 438
 439#ifdef NO_STRLCPY
 440#define strlcpy gitstrlcpy
 441extern size_t gitstrlcpy(char *, const char *, size_t);
 442#endif
 443
 444#ifdef NO_STRTOUMAX
 445#define strtoumax gitstrtoumax
 446extern uintmax_t gitstrtoumax(const char *, char **, int);
 447#define strtoimax gitstrtoimax
 448extern intmax_t gitstrtoimax(const char *, char **, int);
 449#endif
 450
 451#ifdef NO_HSTRERROR
 452#define hstrerror githstrerror
 453extern const char *githstrerror(int herror);
 454#endif
 455
 456#ifdef NO_MEMMEM
 457#define memmem gitmemmem
 458void *gitmemmem(const void *haystack, size_t haystacklen,
 459                const void *needle, size_t needlelen);
 460#endif
 461
 462#ifdef NO_GETPAGESIZE
 463#define getpagesize() sysconf(_SC_PAGESIZE)
 464#endif
 465
 466#ifdef FREAD_READS_DIRECTORIES
 467#ifdef fopen
 468#undef fopen
 469#endif
 470#define fopen(a,b) git_fopen(a,b)
 471extern FILE *git_fopen(const char*, const char*);
 472#endif
 473
 474#ifdef SNPRINTF_RETURNS_BOGUS
 475#define snprintf git_snprintf
 476extern int git_snprintf(char *str, size_t maxsize,
 477                        const char *format, ...);
 478#define vsnprintf git_vsnprintf
 479extern int git_vsnprintf(char *str, size_t maxsize,
 480                         const char *format, va_list ap);
 481#endif
 482
 483#ifdef __GLIBC_PREREQ
 484#if __GLIBC_PREREQ(2, 1)
 485#define HAVE_STRCHRNUL
 486#define HAVE_MEMPCPY
 487#endif
 488#endif
 489
 490#ifndef HAVE_STRCHRNUL
 491#define strchrnul gitstrchrnul
 492static inline char *gitstrchrnul(const char *s, int c)
 493{
 494        while (*s && *s != c)
 495                s++;
 496        return (char *)s;
 497}
 498#endif
 499
 500#ifndef HAVE_MEMPCPY
 501#define mempcpy gitmempcpy
 502static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 503{
 504        return (char *)memcpy(dest, src, n) + n;
 505}
 506#endif
 507
 508#ifdef NO_INET_PTON
 509int inet_pton(int af, const char *src, void *dst);
 510#endif
 511
 512#ifdef NO_INET_NTOP
 513const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 514#endif
 515
 516extern void release_pack_memory(size_t, int);
 517
 518typedef void (*try_to_free_t)(size_t);
 519extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 520
 521extern char *xstrdup(const char *str);
 522extern void *xmalloc(size_t size);
 523extern void *xmallocz(size_t size);
 524extern void *xmemdupz(const void *data, size_t len);
 525extern char *xstrndup(const char *str, size_t len);
 526extern void *xrealloc(void *ptr, size_t size);
 527extern void *xcalloc(size_t nmemb, size_t size);
 528extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 529extern ssize_t xread(int fd, void *buf, size_t len);
 530extern ssize_t xwrite(int fd, const void *buf, size_t len);
 531extern int xdup(int fd);
 532extern FILE *xfdopen(int fd, const char *mode);
 533extern int xmkstemp(char *template);
 534extern int xmkstemp_mode(char *template, int mode);
 535extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 536extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 537
 538static inline size_t xsize_t(off_t len)
 539{
 540        if (len > (size_t) len)
 541                die("Cannot handle files this big");
 542        return (size_t)len;
 543}
 544
 545static inline int has_extension(const char *filename, const char *ext)
 546{
 547        size_t len = strlen(filename);
 548        size_t extlen = strlen(ext);
 549        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 550}
 551
 552/* in ctype.c, for kwset users */
 553extern const char tolower_trans_tbl[256];
 554
 555/* Sane ctype - no locale, and works with signed chars */
 556#undef isascii
 557#undef isspace
 558#undef isdigit
 559#undef isalpha
 560#undef isalnum
 561#undef isprint
 562#undef islower
 563#undef isupper
 564#undef tolower
 565#undef toupper
 566#undef iscntrl
 567#undef ispunct
 568#undef isxdigit
 569
 570extern const unsigned char sane_ctype[256];
 571#define GIT_SPACE 0x01
 572#define GIT_DIGIT 0x02
 573#define GIT_ALPHA 0x04
 574#define GIT_GLOB_SPECIAL 0x08
 575#define GIT_REGEX_SPECIAL 0x10
 576#define GIT_PATHSPEC_MAGIC 0x20
 577#define GIT_CNTRL 0x40
 578#define GIT_PUNCT 0x80
 579#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 580#define isascii(x) (((x) & ~0x7f) == 0)
 581#define isspace(x) sane_istest(x,GIT_SPACE)
 582#define isdigit(x) sane_istest(x,GIT_DIGIT)
 583#define isalpha(x) sane_istest(x,GIT_ALPHA)
 584#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 585#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 586#define islower(x) sane_iscase(x, 1)
 587#define isupper(x) sane_iscase(x, 0)
 588#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 589#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 590#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 591#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 592                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 593#define isxdigit(x) (hexval_table[x] != -1)
 594#define tolower(x) sane_case((unsigned char)(x), 0x20)
 595#define toupper(x) sane_case((unsigned char)(x), 0)
 596#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 597
 598static inline int sane_case(int x, int high)
 599{
 600        if (sane_istest(x, GIT_ALPHA))
 601                x = (x & ~0x20) | high;
 602        return x;
 603}
 604
 605static inline int sane_iscase(int x, int is_lower)
 606{
 607        if (!sane_istest(x, GIT_ALPHA))
 608                return 0;
 609
 610        if (is_lower)
 611                return (x & 0x20) != 0;
 612        else
 613                return (x & 0x20) == 0;
 614}
 615
 616static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 617{
 618        unsigned long ul;
 619        char *p;
 620
 621        errno = 0;
 622        ul = strtoul(s, &p, base);
 623        if (errno || *p || p == s || (unsigned int) ul != ul)
 624                return -1;
 625        *result = ul;
 626        return 0;
 627}
 628
 629static inline int strtol_i(char const *s, int base, int *result)
 630{
 631        long ul;
 632        char *p;
 633
 634        errno = 0;
 635        ul = strtol(s, &p, base);
 636        if (errno || *p || p == s || (int) ul != ul)
 637                return -1;
 638        *result = ul;
 639        return 0;
 640}
 641
 642#ifdef INTERNAL_QSORT
 643void git_qsort(void *base, size_t nmemb, size_t size,
 644               int(*compar)(const void *, const void *));
 645#define qsort git_qsort
 646#endif
 647
 648#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 649# define FORCE_DIR_SET_GID S_ISGID
 650#else
 651# define FORCE_DIR_SET_GID 0
 652#endif
 653
 654#ifdef NO_NSEC
 655#undef USE_NSEC
 656#define ST_CTIME_NSEC(st) 0
 657#define ST_MTIME_NSEC(st) 0
 658#else
 659#ifdef USE_ST_TIMESPEC
 660#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 661#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 662#else
 663#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 664#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 665#endif
 666#endif
 667
 668#ifdef UNRELIABLE_FSTAT
 669#define fstat_is_reliable() 0
 670#else
 671#define fstat_is_reliable() 1
 672#endif
 673
 674#ifndef va_copy
 675/*
 676 * Since an obvious implementation of va_list would be to make it a
 677 * pointer into the stack frame, a simple assignment will work on
 678 * many systems.  But let's try to be more portable.
 679 */
 680#ifdef __va_copy
 681#define va_copy(dst, src) __va_copy(dst, src)
 682#else
 683#define va_copy(dst, src) ((dst) = (src))
 684#endif
 685#endif
 686
 687/*
 688 * Preserves errno, prints a message, but gives no warning for ENOENT.
 689 * Always returns the return value of unlink(2).
 690 */
 691int unlink_or_warn(const char *path);
 692/*
 693 * Likewise for rmdir(2).
 694 */
 695int rmdir_or_warn(const char *path);
 696/*
 697 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 698 * the supplied file mode.
 699 */
 700int remove_or_warn(unsigned int mode, const char *path);
 701
 702/*
 703 * Call access(2), but warn for any error except "missing file"
 704 * (ENOENT or ENOTDIR).
 705 */
 706int access_or_warn(const char *path, int mode);
 707int access_or_die(const char *path, int mode);
 708
 709/* Warn on an inaccessible file that ought to be accessible */
 710void warn_on_inaccessible(const char *path);
 711
 712/* Get the passwd entry for the UID of the current process. */
 713struct passwd *xgetpwuid_self(void);
 714
 715#endif