Andrew's git - gitweb.git/blob

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