Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit path: Fix a sparse warning (2f0aaaf)
   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
 131extern int get_st_mode_bits(const char *path, int *mode);
 132
 133#if defined(__MINGW32__)
 134/* pull in Windows compatibility stuff */
 135#include "compat/mingw.h"
 136#elif defined(_MSC_VER)
 137#include "compat/msvc.h"
 138#else
 139#include <sys/wait.h>
 140#include <sys/resource.h>
 141#include <sys/socket.h>
 142#include <sys/ioctl.h>
 143#include <termios.h>
 144#ifndef NO_SYS_SELECT_H
 145#include <sys/select.h>
 146#endif
 147#include <netinet/in.h>
 148#include <netinet/tcp.h>
 149#include <arpa/inet.h>
 150#include <netdb.h>
 151#include <pwd.h>
 152#include <sys/un.h>
 153#ifndef NO_INTTYPES_H
 154#include <inttypes.h>
 155#else
 156#include <stdint.h>
 157#endif
 158#ifdef NO_INTPTR_T
 159/*
 160 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 161 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 162 * while on IP16 and IP16L32 it is "int" (resp. "short")
 163 * Size needs to match (or exceed) 'sizeof(void *)'.
 164 * We can't take "long long" here as not everybody has it.
 165 */
 166typedef long intptr_t;
 167typedef unsigned long uintptr_t;
 168#endif
 169#if defined(__CYGWIN__)
 170#undef _XOPEN_SOURCE
 171#include <grp.h>
 172#define _XOPEN_SOURCE 600
 173#include "compat/cygwin.h"
 174#else
 175#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 176#include <grp.h>
 177#define _ALL_SOURCE 1
 178#endif
 179#endif
 180
 181/* used on Mac OS X */
 182#ifdef PRECOMPOSE_UNICODE
 183#include "compat/precompose_utf8.h"
 184#else
 185#define precompose_str(in,i_nfd2nfc)
 186#define precompose_argv(c,v)
 187#define probe_utf8_pathname_composition(a,b)
 188#endif
 189
 190#ifdef MKDIR_WO_TRAILING_SLASH
 191#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 192extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 193#endif
 194
 195#ifdef NO_STRUCT_ITIMERVAL
 196struct itimerval {
 197        struct timeval it_interval;
 198        struct timeval it_value;
 199}
 200#endif
 201
 202#ifdef NO_SETITIMER
 203#define setitimer(which,value,ovalue)
 204#endif
 205
 206#ifndef NO_LIBGEN_H
 207#include <libgen.h>
 208#else
 209#define basename gitbasename
 210extern char *gitbasename(char *);
 211#endif
 212
 213#ifndef NO_ICONV
 214#include <iconv.h>
 215#endif
 216
 217#ifndef NO_OPENSSL
 218#include <openssl/ssl.h>
 219#include <openssl/err.h>
 220#endif
 221
 222/* On most systems <netdb.h> would have given us this, but
 223 * not on some systems (e.g. z/OS).
 224 */
 225#ifndef NI_MAXHOST
 226#define NI_MAXHOST 1025
 227#endif
 228
 229#ifndef NI_MAXSERV
 230#define NI_MAXSERV 32
 231#endif
 232
 233/* On most systems <limits.h> would have given us this, but
 234 * not on some systems (e.g. GNU/Hurd).
 235 */
 236#ifndef PATH_MAX
 237#define PATH_MAX 4096
 238#endif
 239
 240#ifndef PRIuMAX
 241#define PRIuMAX "llu"
 242#endif
 243
 244#ifndef PRIu32
 245#define PRIu32 "u"
 246#endif
 247
 248#ifndef PRIx32
 249#define PRIx32 "x"
 250#endif
 251
 252#ifndef PRIo32
 253#define PRIo32 "o"
 254#endif
 255
 256#ifndef PATH_SEP
 257#define PATH_SEP ':'
 258#endif
 259
 260#ifdef HAVE_PATHS_H
 261#include <paths.h>
 262#endif
 263#ifndef _PATH_DEFPATH
 264#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 265#endif
 266
 267#ifndef STRIP_EXTENSION
 268#define STRIP_EXTENSION ""
 269#endif
 270
 271#ifndef has_dos_drive_prefix
 272#define has_dos_drive_prefix(path) 0
 273#endif
 274
 275#ifndef is_dir_sep
 276#define is_dir_sep(c) ((c) == '/')
 277#endif
 278
 279#ifndef find_last_dir_sep
 280#define find_last_dir_sep(path) strrchr(path, '/')
 281#endif
 282
 283#if defined(__HP_cc) && (__HP_cc >= 61000)
 284#define NORETURN __attribute__((noreturn))
 285#define NORETURN_PTR
 286#elif defined(__GNUC__) && !defined(NO_NORETURN)
 287#define NORETURN __attribute__((__noreturn__))
 288#define NORETURN_PTR __attribute__((__noreturn__))
 289#elif defined(_MSC_VER)
 290#define NORETURN __declspec(noreturn)
 291#define NORETURN_PTR
 292#else
 293#define NORETURN
 294#define NORETURN_PTR
 295#ifndef __attribute__
 296#define __attribute__(x)
 297#endif
 298#endif
 299
 300#include "compat/bswap.h"
 301
 302#ifdef USE_WILDMATCH
 303#include "wildmatch.h"
 304#define FNM_PATHNAME WM_PATHNAME
 305#define FNM_CASEFOLD WM_CASEFOLD
 306#define FNM_NOMATCH  WM_NOMATCH
 307static inline int fnmatch(const char *pattern, const char *string, int flags)
 308{
 309        return wildmatch(pattern, string, flags, NULL);
 310}
 311#endif
 312
 313/* General helper functions */
 314extern void vreportf(const char *prefix, const char *err, va_list params);
 315extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 316extern NORETURN void usage(const char *err);
 317extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 318extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 319extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 320extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 321extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 322
 323/*
 324 * Let callers be aware of the constant return value; this can help
 325 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 326 * because some compilers may not support variadic macros. Since we're only
 327 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 328 * using the function as usual.
 329 */
 330#if defined(__GNUC__) && ! defined(__clang__)
 331#define error(...) (error(__VA_ARGS__), -1)
 332#endif
 333
 334extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 335extern void set_error_routine(void (*routine)(const char *err, va_list params));
 336extern void set_die_is_recursing_routine(int (*routine)(void));
 337
 338extern int prefixcmp(const char *str, const char *prefix);
 339extern int suffixcmp(const char *str, const char *suffix);
 340
 341static inline const char *skip_prefix(const char *str, const char *prefix)
 342{
 343        size_t len = strlen(prefix);
 344        return strncmp(str, prefix, len) ? NULL : str + len;
 345}
 346
 347#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 348
 349#ifndef PROT_READ
 350#define PROT_READ 1
 351#define PROT_WRITE 2
 352#define MAP_PRIVATE 1
 353#endif
 354
 355#define mmap git_mmap
 356#define munmap git_munmap
 357extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 358extern int git_munmap(void *start, size_t length);
 359
 360#else /* NO_MMAP || USE_WIN32_MMAP */
 361
 362#include <sys/mman.h>
 363
 364#endif /* NO_MMAP || USE_WIN32_MMAP */
 365
 366#ifdef NO_MMAP
 367
 368/* This value must be multiple of (pagesize * 2) */
 369#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 370
 371#else /* NO_MMAP */
 372
 373/* This value must be multiple of (pagesize * 2) */
 374#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 375        (sizeof(void*) >= 8 \
 376                ?  1 * 1024 * 1024 * 1024 \
 377                : 32 * 1024 * 1024)
 378
 379#endif /* NO_MMAP */
 380
 381#ifndef MAP_FAILED
 382#define MAP_FAILED ((void *)-1)
 383#endif
 384
 385#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 386#define on_disk_bytes(st) ((st).st_size)
 387#else
 388#define on_disk_bytes(st) ((st).st_blocks * 512)
 389#endif
 390
 391#define DEFAULT_PACKED_GIT_LIMIT \
 392        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 393
 394#ifdef NO_PREAD
 395#define pread git_pread
 396extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 397#endif
 398/*
 399 * Forward decl that will remind us if its twin in cache.h changes.
 400 * This function is used in compat/pread.c.  But we can't include
 401 * cache.h there.
 402 */
 403extern ssize_t read_in_full(int fd, void *buf, size_t count);
 404
 405#ifdef NO_SETENV
 406#define setenv gitsetenv
 407extern int gitsetenv(const char *, const char *, int);
 408#endif
 409
 410#ifdef NO_MKDTEMP
 411#define mkdtemp gitmkdtemp
 412extern char *gitmkdtemp(char *);
 413#endif
 414
 415#ifdef NO_MKSTEMPS
 416#define mkstemps gitmkstemps
 417extern int gitmkstemps(char *, int);
 418#endif
 419
 420#ifdef NO_UNSETENV
 421#define unsetenv gitunsetenv
 422extern void gitunsetenv(const char *);
 423#endif
 424
 425#ifdef NO_STRCASESTR
 426#define strcasestr gitstrcasestr
 427extern char *gitstrcasestr(const char *haystack, const char *needle);
 428#endif
 429
 430#ifdef NO_STRLCPY
 431#define strlcpy gitstrlcpy
 432extern size_t gitstrlcpy(char *, const char *, size_t);
 433#endif
 434
 435#ifdef NO_STRTOUMAX
 436#define strtoumax gitstrtoumax
 437extern uintmax_t gitstrtoumax(const char *, char **, int);
 438#define strtoimax gitstrtoimax
 439extern intmax_t gitstrtoimax(const char *, char **, int);
 440#endif
 441
 442#ifdef NO_HSTRERROR
 443#define hstrerror githstrerror
 444extern const char *githstrerror(int herror);
 445#endif
 446
 447#ifdef NO_MEMMEM
 448#define memmem gitmemmem
 449void *gitmemmem(const void *haystack, size_t haystacklen,
 450                const void *needle, size_t needlelen);
 451#endif
 452
 453#ifdef NO_GETPAGESIZE
 454#define getpagesize() sysconf(_SC_PAGESIZE)
 455#endif
 456
 457#ifdef FREAD_READS_DIRECTORIES
 458#ifdef fopen
 459#undef fopen
 460#endif
 461#define fopen(a,b) git_fopen(a,b)
 462extern FILE *git_fopen(const char*, const char*);
 463#endif
 464
 465#ifdef SNPRINTF_RETURNS_BOGUS
 466#define snprintf git_snprintf
 467extern int git_snprintf(char *str, size_t maxsize,
 468                        const char *format, ...);
 469#define vsnprintf git_vsnprintf
 470extern int git_vsnprintf(char *str, size_t maxsize,
 471                         const char *format, va_list ap);
 472#endif
 473
 474#ifdef __GLIBC_PREREQ
 475#if __GLIBC_PREREQ(2, 1)
 476#define HAVE_STRCHRNUL
 477#define HAVE_MEMPCPY
 478#endif
 479#endif
 480
 481#ifndef HAVE_STRCHRNUL
 482#define strchrnul gitstrchrnul
 483static inline char *gitstrchrnul(const char *s, int c)
 484{
 485        while (*s && *s != c)
 486                s++;
 487        return (char *)s;
 488}
 489#endif
 490
 491#ifndef HAVE_MEMPCPY
 492#define mempcpy gitmempcpy
 493static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 494{
 495        return (char *)memcpy(dest, src, n) + n;
 496}
 497#endif
 498
 499#ifdef NO_INET_PTON
 500int inet_pton(int af, const char *src, void *dst);
 501#endif
 502
 503#ifdef NO_INET_NTOP
 504const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 505#endif
 506
 507extern void release_pack_memory(size_t, int);
 508
 509typedef void (*try_to_free_t)(size_t);
 510extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 511
 512extern char *xstrdup(const char *str);
 513extern void *xmalloc(size_t size);
 514extern void *xmallocz(size_t size);
 515extern void *xmemdupz(const void *data, size_t len);
 516extern char *xstrndup(const char *str, size_t len);
 517extern void *xrealloc(void *ptr, size_t size);
 518extern void *xcalloc(size_t nmemb, size_t size);
 519extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 520extern ssize_t xread(int fd, void *buf, size_t len);
 521extern ssize_t xwrite(int fd, const void *buf, size_t len);
 522extern int xdup(int fd);
 523extern FILE *xfdopen(int fd, const char *mode);
 524extern int xmkstemp(char *template);
 525extern int xmkstemp_mode(char *template, int mode);
 526extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 527extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 528
 529static inline size_t xsize_t(off_t len)
 530{
 531        if (len > (size_t) len)
 532                die("Cannot handle files this big");
 533        return (size_t)len;
 534}
 535
 536static inline int has_extension(const char *filename, const char *ext)
 537{
 538        size_t len = strlen(filename);
 539        size_t extlen = strlen(ext);
 540        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 541}
 542
 543/* in ctype.c, for kwset users */
 544extern const char tolower_trans_tbl[256];
 545
 546/* Sane ctype - no locale, and works with signed chars */
 547#undef isascii
 548#undef isspace
 549#undef isdigit
 550#undef isalpha
 551#undef isalnum
 552#undef isprint
 553#undef islower
 554#undef isupper
 555#undef tolower
 556#undef toupper
 557#undef iscntrl
 558#undef ispunct
 559#undef isxdigit
 560
 561extern const unsigned char sane_ctype[256];
 562#define GIT_SPACE 0x01
 563#define GIT_DIGIT 0x02
 564#define GIT_ALPHA 0x04
 565#define GIT_GLOB_SPECIAL 0x08
 566#define GIT_REGEX_SPECIAL 0x10
 567#define GIT_PATHSPEC_MAGIC 0x20
 568#define GIT_CNTRL 0x40
 569#define GIT_PUNCT 0x80
 570#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 571#define isascii(x) (((x) & ~0x7f) == 0)
 572#define isspace(x) sane_istest(x,GIT_SPACE)
 573#define isdigit(x) sane_istest(x,GIT_DIGIT)
 574#define isalpha(x) sane_istest(x,GIT_ALPHA)
 575#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 576#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 577#define islower(x) sane_iscase(x, 1)
 578#define isupper(x) sane_iscase(x, 0)
 579#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 580#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 581#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 582#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 583                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 584#define isxdigit(x) (hexval_table[x] != -1)
 585#define tolower(x) sane_case((unsigned char)(x), 0x20)
 586#define toupper(x) sane_case((unsigned char)(x), 0)
 587#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 588
 589static inline int sane_case(int x, int high)
 590{
 591        if (sane_istest(x, GIT_ALPHA))
 592                x = (x & ~0x20) | high;
 593        return x;
 594}
 595
 596static inline int sane_iscase(int x, int is_lower)
 597{
 598        if (!sane_istest(x, GIT_ALPHA))
 599                return 0;
 600
 601        if (is_lower)
 602                return (x & 0x20) != 0;
 603        else
 604                return (x & 0x20) == 0;
 605}
 606
 607static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 608{
 609        unsigned long ul;
 610        char *p;
 611
 612        errno = 0;
 613        ul = strtoul(s, &p, base);
 614        if (errno || *p || p == s || (unsigned int) ul != ul)
 615                return -1;
 616        *result = ul;
 617        return 0;
 618}
 619
 620static inline int strtol_i(char const *s, int base, int *result)
 621{
 622        long ul;
 623        char *p;
 624
 625        errno = 0;
 626        ul = strtol(s, &p, base);
 627        if (errno || *p || p == s || (int) ul != ul)
 628                return -1;
 629        *result = ul;
 630        return 0;
 631}
 632
 633#ifdef INTERNAL_QSORT
 634void git_qsort(void *base, size_t nmemb, size_t size,
 635               int(*compar)(const void *, const void *));
 636#define qsort git_qsort
 637#endif
 638
 639#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 640# define FORCE_DIR_SET_GID S_ISGID
 641#else
 642# define FORCE_DIR_SET_GID 0
 643#endif
 644
 645#ifdef NO_NSEC
 646#undef USE_NSEC
 647#define ST_CTIME_NSEC(st) 0
 648#define ST_MTIME_NSEC(st) 0
 649#else
 650#ifdef USE_ST_TIMESPEC
 651#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 652#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 653#else
 654#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 655#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 656#endif
 657#endif
 658
 659#ifdef UNRELIABLE_FSTAT
 660#define fstat_is_reliable() 0
 661#else
 662#define fstat_is_reliable() 1
 663#endif
 664
 665#ifndef va_copy
 666/*
 667 * Since an obvious implementation of va_list would be to make it a
 668 * pointer into the stack frame, a simple assignment will work on
 669 * many systems.  But let's try to be more portable.
 670 */
 671#ifdef __va_copy
 672#define va_copy(dst, src) __va_copy(dst, src)
 673#else
 674#define va_copy(dst, src) ((dst) = (src))
 675#endif
 676#endif
 677
 678/*
 679 * Preserves errno, prints a message, but gives no warning for ENOENT.
 680 * Always returns the return value of unlink(2).
 681 */
 682int unlink_or_warn(const char *path);
 683/*
 684 * Likewise for rmdir(2).
 685 */
 686int rmdir_or_warn(const char *path);
 687/*
 688 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 689 * the supplied file mode.
 690 */
 691int remove_or_warn(unsigned int mode, const char *path);
 692
 693/*
 694 * Call access(2), but warn for any error except "missing file"
 695 * (ENOENT or ENOTDIR).
 696 */
 697int access_or_warn(const char *path, int mode);
 698int access_or_die(const char *path, int mode);
 699
 700/* Warn on an inaccessible file that ought to be accessible */
 701void warn_on_inaccessible(const char *path);
 702
 703/* Get the passwd entry for the UID of the current process. */
 704struct passwd *xgetpwuid_self(void);
 705
 706#endif