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