Andrew's git / gitweb.git / git-compat-util.h
?
git-compat-util.hon commit Merge branch 'rs/empty-archive' (1931f6d)
   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#if defined(__MINGW32__)
 131/* pull in Windows compatibility stuff */
 132#include "compat/mingw.h"
 133#elif defined(_MSC_VER)
 134#include "compat/msvc.h"
 135#else
 136#include <sys/wait.h>
 137#include <sys/resource.h>
 138#include <sys/socket.h>
 139#include <sys/ioctl.h>
 140#include <termios.h>
 141#ifndef NO_SYS_SELECT_H
 142#include <sys/select.h>
 143#endif
 144#include <netinet/in.h>
 145#include <netinet/tcp.h>
 146#include <arpa/inet.h>
 147#include <netdb.h>
 148#include <pwd.h>
 149#include <sys/un.h>
 150#ifndef NO_INTTYPES_H
 151#include <inttypes.h>
 152#else
 153#include <stdint.h>
 154#endif
 155#ifdef NO_INTPTR_T
 156/*
 157 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 158 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 159 * while on IP16 and IP16L32 it is "int" (resp. "short")
 160 * Size needs to match (or exceed) 'sizeof(void *)'.
 161 * We can't take "long long" here as not everybody has it.
 162 */
 163typedef long intptr_t;
 164typedef unsigned long uintptr_t;
 165#endif
 166int get_st_mode_bits(const char *path, int *mode);
 167#if defined(__CYGWIN__)
 168#undef _XOPEN_SOURCE
 169#include <grp.h>
 170#define _XOPEN_SOURCE 600
 171#include "compat/cygwin.h"
 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 MKDIR_WO_TRAILING_SLASH
 189#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 190extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 191#endif
 192
 193#ifdef NO_STRUCT_ITIMERVAL
 194struct itimerval {
 195        struct timeval it_interval;
 196        struct timeval it_value;
 197}
 198#endif
 199
 200#ifdef NO_SETITIMER
 201#define setitimer(which,value,ovalue)
 202#endif
 203
 204#ifndef NO_LIBGEN_H
 205#include <libgen.h>
 206#else
 207#define basename gitbasename
 208extern char *gitbasename(char *);
 209#endif
 210
 211#ifndef NO_ICONV
 212#include <iconv.h>
 213#endif
 214
 215#ifndef NO_OPENSSL
 216#include <openssl/ssl.h>
 217#include <openssl/err.h>
 218#endif
 219
 220/* On most systems <netdb.h> would have given us this, but
 221 * not on some systems (e.g. z/OS).
 222 */
 223#ifndef NI_MAXHOST
 224#define NI_MAXHOST 1025
 225#endif
 226
 227#ifndef NI_MAXSERV
 228#define NI_MAXSERV 32
 229#endif
 230
 231/* On most systems <limits.h> would have given us this, but
 232 * not on some systems (e.g. GNU/Hurd).
 233 */
 234#ifndef PATH_MAX
 235#define PATH_MAX 4096
 236#endif
 237
 238#ifndef PRIuMAX
 239#define PRIuMAX "llu"
 240#endif
 241
 242#ifndef PRIu32
 243#define PRIu32 "u"
 244#endif
 245
 246#ifndef PRIx32
 247#define PRIx32 "x"
 248#endif
 249
 250#ifndef PRIo32
 251#define PRIo32 "o"
 252#endif
 253
 254#ifndef PATH_SEP
 255#define PATH_SEP ':'
 256#endif
 257
 258#ifdef HAVE_PATHS_H
 259#include <paths.h>
 260#endif
 261#ifndef _PATH_DEFPATH
 262#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 263#endif
 264
 265#ifndef STRIP_EXTENSION
 266#define STRIP_EXTENSION ""
 267#endif
 268
 269#ifndef has_dos_drive_prefix
 270#define has_dos_drive_prefix(path) 0
 271#endif
 272
 273#ifndef is_dir_sep
 274#define is_dir_sep(c) ((c) == '/')
 275#endif
 276
 277#ifndef find_last_dir_sep
 278#define find_last_dir_sep(path) strrchr(path, '/')
 279#endif
 280
 281#if defined(__HP_cc) && (__HP_cc >= 61000)
 282#define NORETURN __attribute__((noreturn))
 283#define NORETURN_PTR
 284#elif defined(__GNUC__) && !defined(NO_NORETURN)
 285#define NORETURN __attribute__((__noreturn__))
 286#define NORETURN_PTR __attribute__((__noreturn__))
 287#elif defined(_MSC_VER)
 288#define NORETURN __declspec(noreturn)
 289#define NORETURN_PTR
 290#else
 291#define NORETURN
 292#define NORETURN_PTR
 293#ifndef __attribute__
 294#define __attribute__(x)
 295#endif
 296#endif
 297
 298#include "compat/bswap.h"
 299
 300#ifdef USE_WILDMATCH
 301#include "wildmatch.h"
 302#define FNM_PATHNAME WM_PATHNAME
 303#define FNM_CASEFOLD WM_CASEFOLD
 304#define FNM_NOMATCH  WM_NOMATCH
 305static inline int fnmatch(const char *pattern, const char *string, int flags)
 306{
 307        return wildmatch(pattern, string, flags, NULL);
 308}
 309#endif
 310
 311/* General helper functions */
 312extern void vreportf(const char *prefix, const char *err, va_list params);
 313extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 314extern NORETURN void usage(const char *err);
 315extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 316extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 317extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 318extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 319extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 320
 321/*
 322 * Let callers be aware of the constant return value; this can help
 323 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 324 * because some compilers may not support variadic macros. Since we're only
 325 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 326 * using the function as usual.
 327 */
 328#if defined(__GNUC__) && ! defined(__clang__)
 329#define error(...) (error(__VA_ARGS__), -1)
 330#endif
 331
 332extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 333extern void set_error_routine(void (*routine)(const char *err, va_list params));
 334
 335extern int prefixcmp(const char *str, const char *prefix);
 336extern int suffixcmp(const char *str, const char *suffix);
 337
 338static inline const char *skip_prefix(const char *str, const char *prefix)
 339{
 340        size_t len = strlen(prefix);
 341        return strncmp(str, prefix, len) ? NULL : str + len;
 342}
 343
 344#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 345
 346#ifndef PROT_READ
 347#define PROT_READ 1
 348#define PROT_WRITE 2
 349#define MAP_PRIVATE 1
 350#endif
 351
 352#define mmap git_mmap
 353#define munmap git_munmap
 354extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 355extern int git_munmap(void *start, size_t length);
 356
 357#else /* NO_MMAP || USE_WIN32_MMAP */
 358
 359#include <sys/mman.h>
 360
 361#endif /* NO_MMAP || USE_WIN32_MMAP */
 362
 363#ifdef NO_MMAP
 364
 365/* This value must be multiple of (pagesize * 2) */
 366#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 367
 368#else /* NO_MMAP */
 369
 370/* This value must be multiple of (pagesize * 2) */
 371#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 372        (sizeof(void*) >= 8 \
 373                ?  1 * 1024 * 1024 * 1024 \
 374                : 32 * 1024 * 1024)
 375
 376#endif /* NO_MMAP */
 377
 378#ifndef MAP_FAILED
 379#define MAP_FAILED ((void *)-1)
 380#endif
 381
 382#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 383#define on_disk_bytes(st) ((st).st_size)
 384#else
 385#define on_disk_bytes(st) ((st).st_blocks * 512)
 386#endif
 387
 388#define DEFAULT_PACKED_GIT_LIMIT \
 389        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 390
 391#ifdef NO_PREAD
 392#define pread git_pread
 393extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 394#endif
 395/*
 396 * Forward decl that will remind us if its twin in cache.h changes.
 397 * This function is used in compat/pread.c.  But we can't include
 398 * cache.h there.
 399 */
 400extern ssize_t read_in_full(int fd, void *buf, size_t count);
 401
 402#ifdef NO_SETENV
 403#define setenv gitsetenv
 404extern int gitsetenv(const char *, const char *, int);
 405#endif
 406
 407#ifdef NO_MKDTEMP
 408#define mkdtemp gitmkdtemp
 409extern char *gitmkdtemp(char *);
 410#endif
 411
 412#ifdef NO_MKSTEMPS
 413#define mkstemps gitmkstemps
 414extern int gitmkstemps(char *, int);
 415#endif
 416
 417#ifdef NO_UNSETENV
 418#define unsetenv gitunsetenv
 419extern void gitunsetenv(const char *);
 420#endif
 421
 422#ifdef NO_STRCASESTR
 423#define strcasestr gitstrcasestr
 424extern char *gitstrcasestr(const char *haystack, const char *needle);
 425#endif
 426
 427#ifdef NO_STRLCPY
 428#define strlcpy gitstrlcpy
 429extern size_t gitstrlcpy(char *, const char *, size_t);
 430#endif
 431
 432#ifdef NO_STRTOUMAX
 433#define strtoumax gitstrtoumax
 434extern uintmax_t gitstrtoumax(const char *, char **, int);
 435#define strtoimax gitstrtoimax
 436extern intmax_t gitstrtoimax(const char *, char **, int);
 437#endif
 438
 439#ifdef NO_HSTRERROR
 440#define hstrerror githstrerror
 441extern const char *githstrerror(int herror);
 442#endif
 443
 444#ifdef NO_MEMMEM
 445#define memmem gitmemmem
 446void *gitmemmem(const void *haystack, size_t haystacklen,
 447                const void *needle, size_t needlelen);
 448#endif
 449
 450#ifdef NO_GETPAGESIZE
 451#define getpagesize() sysconf(_SC_PAGESIZE)
 452#endif
 453
 454#ifdef FREAD_READS_DIRECTORIES
 455#ifdef fopen
 456#undef fopen
 457#endif
 458#define fopen(a,b) git_fopen(a,b)
 459extern FILE *git_fopen(const char*, const char*);
 460#endif
 461
 462#ifdef SNPRINTF_RETURNS_BOGUS
 463#define snprintf git_snprintf
 464extern int git_snprintf(char *str, size_t maxsize,
 465                        const char *format, ...);
 466#define vsnprintf git_vsnprintf
 467extern int git_vsnprintf(char *str, size_t maxsize,
 468                         const char *format, va_list ap);
 469#endif
 470
 471#ifdef __GLIBC_PREREQ
 472#if __GLIBC_PREREQ(2, 1)
 473#define HAVE_STRCHRNUL
 474#define HAVE_MEMPCPY
 475#endif
 476#endif
 477
 478#ifndef HAVE_STRCHRNUL
 479#define strchrnul gitstrchrnul
 480static inline char *gitstrchrnul(const char *s, int c)
 481{
 482        while (*s && *s != c)
 483                s++;
 484        return (char *)s;
 485}
 486#endif
 487
 488#ifndef HAVE_MEMPCPY
 489#define mempcpy gitmempcpy
 490static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 491{
 492        return (char *)memcpy(dest, src, n) + n;
 493}
 494#endif
 495
 496#ifdef NO_INET_PTON
 497int inet_pton(int af, const char *src, void *dst);
 498#endif
 499
 500#ifdef NO_INET_NTOP
 501const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 502#endif
 503
 504extern void release_pack_memory(size_t, int);
 505
 506typedef void (*try_to_free_t)(size_t);
 507extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 508
 509extern char *xstrdup(const char *str);
 510extern void *xmalloc(size_t size);
 511extern void *xmallocz(size_t size);
 512extern void *xmemdupz(const void *data, size_t len);
 513extern char *xstrndup(const char *str, size_t len);
 514extern void *xrealloc(void *ptr, size_t size);
 515extern void *xcalloc(size_t nmemb, size_t size);
 516extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 517extern ssize_t xread(int fd, void *buf, size_t len);
 518extern ssize_t xwrite(int fd, const void *buf, size_t len);
 519extern int xdup(int fd);
 520extern FILE *xfdopen(int fd, const char *mode);
 521extern int xmkstemp(char *template);
 522extern int xmkstemp_mode(char *template, int mode);
 523extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 524extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 525
 526static inline size_t xsize_t(off_t len)
 527{
 528        if (len > (size_t) len)
 529                die("Cannot handle files this big");
 530        return (size_t)len;
 531}
 532
 533static inline int has_extension(const char *filename, const char *ext)
 534{
 535        size_t len = strlen(filename);
 536        size_t extlen = strlen(ext);
 537        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 538}
 539
 540/* in ctype.c, for kwset users */
 541extern const char tolower_trans_tbl[256];
 542
 543/* Sane ctype - no locale, and works with signed chars */
 544#undef isascii
 545#undef isspace
 546#undef isdigit
 547#undef isalpha
 548#undef isalnum
 549#undef isprint
 550#undef islower
 551#undef isupper
 552#undef tolower
 553#undef toupper
 554#undef iscntrl
 555#undef ispunct
 556#undef isxdigit
 557
 558extern const unsigned char sane_ctype[256];
 559#define GIT_SPACE 0x01
 560#define GIT_DIGIT 0x02
 561#define GIT_ALPHA 0x04
 562#define GIT_GLOB_SPECIAL 0x08
 563#define GIT_REGEX_SPECIAL 0x10
 564#define GIT_PATHSPEC_MAGIC 0x20
 565#define GIT_CNTRL 0x40
 566#define GIT_PUNCT 0x80
 567#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 568#define isascii(x) (((x) & ~0x7f) == 0)
 569#define isspace(x) sane_istest(x,GIT_SPACE)
 570#define isdigit(x) sane_istest(x,GIT_DIGIT)
 571#define isalpha(x) sane_istest(x,GIT_ALPHA)
 572#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 573#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 574#define islower(x) sane_iscase(x, 1)
 575#define isupper(x) sane_iscase(x, 0)
 576#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 577#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 578#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 579#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 580                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 581#define isxdigit(x) (hexval_table[x] != -1)
 582#define tolower(x) sane_case((unsigned char)(x), 0x20)
 583#define toupper(x) sane_case((unsigned char)(x), 0)
 584#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 585
 586static inline int sane_case(int x, int high)
 587{
 588        if (sane_istest(x, GIT_ALPHA))
 589                x = (x & ~0x20) | high;
 590        return x;
 591}
 592
 593static inline int sane_iscase(int x, int is_lower)
 594{
 595        if (!sane_istest(x, GIT_ALPHA))
 596                return 0;
 597
 598        if (is_lower)
 599                return (x & 0x20) != 0;
 600        else
 601                return (x & 0x20) == 0;
 602}
 603
 604static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 605{
 606        unsigned long ul;
 607        char *p;
 608
 609        errno = 0;
 610        ul = strtoul(s, &p, base);
 611        if (errno || *p || p == s || (unsigned int) ul != ul)
 612                return -1;
 613        *result = ul;
 614        return 0;
 615}
 616
 617static inline int strtol_i(char const *s, int base, int *result)
 618{
 619        long ul;
 620        char *p;
 621
 622        errno = 0;
 623        ul = strtol(s, &p, base);
 624        if (errno || *p || p == s || (int) ul != ul)
 625                return -1;
 626        *result = ul;
 627        return 0;
 628}
 629
 630#ifdef INTERNAL_QSORT
 631void git_qsort(void *base, size_t nmemb, size_t size,
 632               int(*compar)(const void *, const void *));
 633#define qsort git_qsort
 634#endif
 635
 636#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 637# define FORCE_DIR_SET_GID S_ISGID
 638#else
 639# define FORCE_DIR_SET_GID 0
 640#endif
 641
 642#ifdef NO_NSEC
 643#undef USE_NSEC
 644#define ST_CTIME_NSEC(st) 0
 645#define ST_MTIME_NSEC(st) 0
 646#else
 647#ifdef USE_ST_TIMESPEC
 648#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 649#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 650#else
 651#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 652#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 653#endif
 654#endif
 655
 656#ifdef UNRELIABLE_FSTAT
 657#define fstat_is_reliable() 0
 658#else
 659#define fstat_is_reliable() 1
 660#endif
 661
 662#ifndef va_copy
 663/*
 664 * Since an obvious implementation of va_list would be to make it a
 665 * pointer into the stack frame, a simple assignment will work on
 666 * many systems.  But let's try to be more portable.
 667 */
 668#ifdef __va_copy
 669#define va_copy(dst, src) __va_copy(dst, src)
 670#else
 671#define va_copy(dst, src) ((dst) = (src))
 672#endif
 673#endif
 674
 675/*
 676 * Preserves errno, prints a message, but gives no warning for ENOENT.
 677 * Always returns the return value of unlink(2).
 678 */
 679int unlink_or_warn(const char *path);
 680/*
 681 * Likewise for rmdir(2).
 682 */
 683int rmdir_or_warn(const char *path);
 684/*
 685 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 686 * the supplied file mode.
 687 */
 688int remove_or_warn(unsigned int mode, const char *path);
 689
 690/*
 691 * Call access(2), but warn for any error except "missing file"
 692 * (ENOENT or ENOTDIR).
 693 */
 694int access_or_warn(const char *path, int mode);
 695int access_or_die(const char *path, int mode);
 696
 697/* Warn on an inaccessible file that ought to be accessible */
 698void warn_on_inaccessible(const char *path);
 699
 700/* Get the passwd entry for the UID of the current process. */
 701struct passwd *xgetpwuid_self(void);
 702
 703#endif