Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Merge branch 'sh/write-pack-file-warning-message-fix' (56e2874)
   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__) && !defined(__MirBSD__)
  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) && !defined(_WIN32_WINNT)
  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#include <assert.h>
 120#include <regex.h>
 121#include <utime.h>
 122#include <syslog.h>
 123#ifndef NO_SYS_POLL_H
 124#include <sys/poll.h>
 125#else
 126#include <poll.h>
 127#endif
 128
 129#if defined(__MINGW32__)
 130/* pull in Windows compatibility stuff */
 131#include "compat/mingw.h"
 132#elif defined(_MSC_VER)
 133#include "compat/msvc.h"
 134#else
 135#include <sys/wait.h>
 136#include <sys/resource.h>
 137#include <sys/socket.h>
 138#include <sys/ioctl.h>
 139#include <termios.h>
 140#ifndef NO_SYS_SELECT_H
 141#include <sys/select.h>
 142#endif
 143#include <netinet/in.h>
 144#include <netinet/tcp.h>
 145#include <arpa/inet.h>
 146#include <netdb.h>
 147#include <pwd.h>
 148#include <sys/un.h>
 149#ifndef NO_INTTYPES_H
 150#include <inttypes.h>
 151#else
 152#include <stdint.h>
 153#endif
 154#ifdef NO_INTPTR_T
 155/*
 156 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 157 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 158 * while on IP16 and IP16L32 it is "int" (resp. "short")
 159 * Size needs to match (or exceed) 'sizeof(void *)'.
 160 * We can't take "long long" here as not everybody has it.
 161 */
 162typedef long intptr_t;
 163typedef unsigned long uintptr_t;
 164#endif
 165#if defined(__CYGWIN__)
 166#undef _XOPEN_SOURCE
 167#include <grp.h>
 168#define _XOPEN_SOURCE 600
 169#else
 170#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 171#include <grp.h>
 172#define _ALL_SOURCE 1
 173#endif
 174#endif
 175
 176/* used on Mac OS X */
 177#ifdef PRECOMPOSE_UNICODE
 178#include "compat/precompose_utf8.h"
 179#else
 180#define precompose_str(in,i_nfd2nfc)
 181#define precompose_argv(c,v)
 182#define probe_utf8_pathname_composition(a,b)
 183#endif
 184
 185#ifdef MKDIR_WO_TRAILING_SLASH
 186#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 187extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 188#endif
 189
 190#ifdef NO_STRUCT_ITIMERVAL
 191struct itimerval {
 192        struct timeval it_interval;
 193        struct timeval it_value;
 194}
 195#endif
 196
 197#ifdef NO_SETITIMER
 198#define setitimer(which,value,ovalue)
 199#endif
 200
 201#ifndef NO_LIBGEN_H
 202#include <libgen.h>
 203#else
 204#define basename gitbasename
 205extern char *gitbasename(char *);
 206#endif
 207
 208#ifndef NO_ICONV
 209#include <iconv.h>
 210#endif
 211
 212#ifndef NO_OPENSSL
 213#include <openssl/ssl.h>
 214#include <openssl/err.h>
 215#endif
 216
 217/* On most systems <netdb.h> would have given us this, but
 218 * not on some systems (e.g. z/OS).
 219 */
 220#ifndef NI_MAXHOST
 221#define NI_MAXHOST 1025
 222#endif
 223
 224#ifndef NI_MAXSERV
 225#define NI_MAXSERV 32
 226#endif
 227
 228/* On most systems <limits.h> would have given us this, but
 229 * not on some systems (e.g. GNU/Hurd).
 230 */
 231#ifndef PATH_MAX
 232#define PATH_MAX 4096
 233#endif
 234
 235#ifndef PRIuMAX
 236#define PRIuMAX "llu"
 237#endif
 238
 239#ifndef PRIu32
 240#define PRIu32 "u"
 241#endif
 242
 243#ifndef PRIx32
 244#define PRIx32 "x"
 245#endif
 246
 247#ifndef PRIo32
 248#define PRIo32 "o"
 249#endif
 250
 251#ifndef PATH_SEP
 252#define PATH_SEP ':'
 253#endif
 254
 255#ifdef HAVE_PATHS_H
 256#include <paths.h>
 257#endif
 258#ifndef _PATH_DEFPATH
 259#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 260#endif
 261
 262#ifndef STRIP_EXTENSION
 263#define STRIP_EXTENSION ""
 264#endif
 265
 266#ifndef has_dos_drive_prefix
 267#define has_dos_drive_prefix(path) 0
 268#endif
 269
 270#ifndef is_dir_sep
 271#define is_dir_sep(c) ((c) == '/')
 272#endif
 273
 274#ifndef find_last_dir_sep
 275#define find_last_dir_sep(path) strrchr(path, '/')
 276#endif
 277
 278#if defined(__HP_cc) && (__HP_cc >= 61000)
 279#define NORETURN __attribute__((noreturn))
 280#define NORETURN_PTR
 281#elif defined(__GNUC__) && !defined(NO_NORETURN)
 282#define NORETURN __attribute__((__noreturn__))
 283#define NORETURN_PTR __attribute__((__noreturn__))
 284#elif defined(_MSC_VER)
 285#define NORETURN __declspec(noreturn)
 286#define NORETURN_PTR
 287#else
 288#define NORETURN
 289#define NORETURN_PTR
 290#ifndef __attribute__
 291#define __attribute__(x)
 292#endif
 293#endif
 294
 295/* The sentinel attribute is valid from gcc version 4.0 */
 296#if defined(__GNUC__) && (__GNUC__ >= 4)
 297#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 298#else
 299#define LAST_ARG_MUST_BE_NULL
 300#endif
 301
 302#include "compat/bswap.h"
 303
 304#include "wildmatch.h"
 305
 306/* General helper functions */
 307extern void vreportf(const char *prefix, const char *err, va_list params);
 308extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 309extern NORETURN void usage(const char *err);
 310extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 311extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 312extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 313extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 314extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 315
 316#ifndef NO_OPENSSL
 317#ifdef APPLE_COMMON_CRYPTO
 318#include "compat/apple-common-crypto.h"
 319#else
 320#include <openssl/evp.h>
 321#include <openssl/hmac.h>
 322#endif /* APPLE_COMMON_CRYPTO */
 323#include <openssl/x509v3.h>
 324#endif /* NO_OPENSSL */
 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 starts_with(const char *str, const char *prefix);
 342extern int ends_with(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#ifdef snprintf
 470#undef snprintf
 471#endif
 472#define snprintf git_snprintf
 473extern int git_snprintf(char *str, size_t maxsize,
 474                        const char *format, ...);
 475#ifdef vsnprintf
 476#undef vsnprintf
 477#endif
 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);
 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 */
 706#define ACCESS_EACCES_OK (1U << 0)
 707int access_or_warn(const char *path, int mode, unsigned flag);
 708int access_or_die(const char *path, int mode, unsigned flag);
 709
 710/* Warn on an inaccessible file that ought to be accessible */
 711void warn_on_inaccessible(const char *path);
 712
 713/* Get the passwd entry for the UID of the current process. */
 714struct passwd *xgetpwuid_self(void);
 715
 716#endif