Andrew's git - gitweb.git/blob

90e037203879f6ba91403ae5371f18910206b580
   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
 166#if defined(__CYGWIN__)
 167#undef _XOPEN_SOURCE
 168#include <grp.h>
 169#define _XOPEN_SOURCE 600
 170#include "compat/cygwin.h"
 171#else
 172#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 173#include <grp.h>
 174#define _ALL_SOURCE 1
 175#endif
 176#endif
 177
 178/* used on Mac OS X */
 179#ifdef PRECOMPOSE_UNICODE
 180#include "compat/precompose_utf8.h"
 181#else
 182#define precompose_str(in,i_nfd2nfc)
 183#define precompose_argv(c,v)
 184#define probe_utf8_pathname_composition(a,b)
 185#endif
 186
 187#ifdef MKDIR_WO_TRAILING_SLASH
 188#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 189extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 190#endif
 191
 192#ifdef NO_STRUCT_ITIMERVAL
 193struct itimerval {
 194        struct timeval it_interval;
 195        struct timeval it_value;
 196}
 197#endif
 198
 199#ifdef NO_SETITIMER
 200#define setitimer(which,value,ovalue)
 201#endif
 202
 203#ifndef NO_LIBGEN_H
 204#include <libgen.h>
 205#else
 206#define basename gitbasename
 207extern char *gitbasename(char *);
 208#endif
 209
 210#ifndef NO_ICONV
 211#include <iconv.h>
 212#endif
 213
 214#ifndef NO_OPENSSL
 215#include <openssl/ssl.h>
 216#include <openssl/err.h>
 217#endif
 218
 219/* On most systems <netdb.h> would have given us this, but
 220 * not on some systems (e.g. z/OS).
 221 */
 222#ifndef NI_MAXHOST
 223#define NI_MAXHOST 1025
 224#endif
 225
 226#ifndef NI_MAXSERV
 227#define NI_MAXSERV 32
 228#endif
 229
 230/* On most systems <limits.h> would have given us this, but
 231 * not on some systems (e.g. GNU/Hurd).
 232 */
 233#ifndef PATH_MAX
 234#define PATH_MAX 4096
 235#endif
 236
 237#ifndef PRIuMAX
 238#define PRIuMAX "llu"
 239#endif
 240
 241#ifndef PRIu32
 242#define PRIu32 "u"
 243#endif
 244
 245#ifndef PRIx32
 246#define PRIx32 "x"
 247#endif
 248
 249#ifndef PRIo32
 250#define PRIo32 "o"
 251#endif
 252
 253#ifndef PATH_SEP
 254#define PATH_SEP ':'
 255#endif
 256
 257#ifdef HAVE_PATHS_H
 258#include <paths.h>
 259#endif
 260#ifndef _PATH_DEFPATH
 261#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 262#endif
 263
 264#ifndef STRIP_EXTENSION
 265#define STRIP_EXTENSION ""
 266#endif
 267
 268#ifndef has_dos_drive_prefix
 269#define has_dos_drive_prefix(path) 0
 270#endif
 271
 272#ifndef is_dir_sep
 273#define is_dir_sep(c) ((c) == '/')
 274#endif
 275
 276#ifndef find_last_dir_sep
 277#define find_last_dir_sep(path) strrchr(path, '/')
 278#endif
 279
 280#if defined(__HP_cc) && (__HP_cc >= 61000)
 281#define NORETURN __attribute__((noreturn))
 282#define NORETURN_PTR
 283#elif defined(__GNUC__) && !defined(NO_NORETURN)
 284#define NORETURN __attribute__((__noreturn__))
 285#define NORETURN_PTR __attribute__((__noreturn__))
 286#elif defined(_MSC_VER)
 287#define NORETURN __declspec(noreturn)
 288#define NORETURN_PTR
 289#else
 290#define NORETURN
 291#define NORETURN_PTR
 292#ifndef __attribute__
 293#define __attribute__(x)
 294#endif
 295#endif
 296
 297#include "compat/bswap.h"
 298
 299#ifdef USE_WILDMATCH
 300#include "wildmatch.h"
 301#define FNM_PATHNAME WM_PATHNAME
 302#define FNM_CASEFOLD WM_CASEFOLD
 303#define FNM_NOMATCH  WM_NOMATCH
 304static inline int fnmatch(const char *pattern, const char *string, int flags)
 305{
 306        return wildmatch(pattern, string, flags, NULL);
 307}
 308#endif
 309
 310/* General helper functions */
 311extern void vreportf(const char *prefix, const char *err, va_list params);
 312extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 313extern NORETURN void usage(const char *err);
 314extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 315extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 316extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 317extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 318extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 319
 320/*
 321 * Let callers be aware of the constant return value; this can help
 322 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 323 * because some compilers may not support variadic macros. Since we're only
 324 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 325 * using the function as usual.
 326 */
 327#if defined(__GNUC__) && ! defined(__clang__)
 328#define error(...) (error(__VA_ARGS__), -1)
 329#endif
 330
 331extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 332extern void set_error_routine(void (*routine)(const char *err, va_list params));
 333
 334extern int prefixcmp(const char *str, const char *prefix);
 335extern int suffixcmp(const char *str, const char *suffix);
 336
 337static inline const char *skip_prefix(const char *str, const char *prefix)
 338{
 339        size_t len = strlen(prefix);
 340        return strncmp(str, prefix, len) ? NULL : str + len;
 341}
 342
 343#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 344
 345#ifndef PROT_READ
 346#define PROT_READ 1
 347#define PROT_WRITE 2
 348#define MAP_PRIVATE 1
 349#endif
 350
 351#define mmap git_mmap
 352#define munmap git_munmap
 353extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 354extern int git_munmap(void *start, size_t length);
 355
 356#else /* NO_MMAP || USE_WIN32_MMAP */
 357
 358#include <sys/mman.h>
 359
 360#endif /* NO_MMAP || USE_WIN32_MMAP */
 361
 362#ifdef NO_MMAP
 363
 364/* This value must be multiple of (pagesize * 2) */
 365#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 366
 367#else /* NO_MMAP */
 368
 369/* This value must be multiple of (pagesize * 2) */
 370#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 371        (sizeof(void*) >= 8 \
 372                ?  1 * 1024 * 1024 * 1024 \
 373                : 32 * 1024 * 1024)
 374
 375#endif /* NO_MMAP */
 376
 377#ifndef MAP_FAILED
 378#define MAP_FAILED ((void *)-1)
 379#endif
 380
 381#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 382#define on_disk_bytes(st) ((st).st_size)
 383#else
 384#define on_disk_bytes(st) ((st).st_blocks * 512)
 385#endif
 386
 387#define DEFAULT_PACKED_GIT_LIMIT \
 388        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 389
 390#ifdef NO_PREAD
 391#define pread git_pread
 392extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 393#endif
 394/*
 395 * Forward decl that will remind us if its twin in cache.h changes.
 396 * This function is used in compat/pread.c.  But we can't include
 397 * cache.h there.
 398 */
 399extern ssize_t read_in_full(int fd, void *buf, size_t count);
 400
 401#ifdef NO_SETENV
 402#define setenv gitsetenv
 403extern int gitsetenv(const char *, const char *, int);
 404#endif
 405
 406#ifdef NO_MKDTEMP
 407#define mkdtemp gitmkdtemp
 408extern char *gitmkdtemp(char *);
 409#endif
 410
 411#ifdef NO_MKSTEMPS
 412#define mkstemps gitmkstemps
 413extern int gitmkstemps(char *, int);
 414#endif
 415
 416#ifdef NO_UNSETENV
 417#define unsetenv gitunsetenv
 418extern void gitunsetenv(const char *);
 419#endif
 420
 421#ifdef NO_STRCASESTR
 422#define strcasestr gitstrcasestr
 423extern char *gitstrcasestr(const char *haystack, const char *needle);
 424#endif
 425
 426#ifdef NO_STRLCPY
 427#define strlcpy gitstrlcpy
 428extern size_t gitstrlcpy(char *, const char *, size_t);
 429#endif
 430
 431#ifdef NO_STRTOUMAX
 432#define strtoumax gitstrtoumax
 433extern uintmax_t gitstrtoumax(const char *, char **, int);
 434#define strtoimax gitstrtoimax
 435extern intmax_t gitstrtoimax(const char *, char **, int);
 436#endif
 437
 438#ifdef NO_HSTRERROR
 439#define hstrerror githstrerror
 440extern const char *githstrerror(int herror);
 441#endif
 442
 443#ifdef NO_MEMMEM
 444#define memmem gitmemmem
 445void *gitmemmem(const void *haystack, size_t haystacklen,
 446                const void *needle, size_t needlelen);
 447#endif
 448
 449#ifdef NO_GETPAGESIZE
 450#define getpagesize() sysconf(_SC_PAGESIZE)
 451#endif
 452
 453#ifdef FREAD_READS_DIRECTORIES
 454#ifdef fopen
 455#undef fopen
 456#endif
 457#define fopen(a,b) git_fopen(a,b)
 458extern FILE *git_fopen(const char*, const char*);
 459#endif
 460
 461#ifdef SNPRINTF_RETURNS_BOGUS
 462#define snprintf git_snprintf
 463extern int git_snprintf(char *str, size_t maxsize,
 464                        const char *format, ...);
 465#define vsnprintf git_vsnprintf
 466extern int git_vsnprintf(char *str, size_t maxsize,
 467                         const char *format, va_list ap);
 468#endif
 469
 470#ifdef __GLIBC_PREREQ
 471#if __GLIBC_PREREQ(2, 1)
 472#define HAVE_STRCHRNUL
 473#define HAVE_MEMPCPY
 474#endif
 475#endif
 476
 477#ifndef HAVE_STRCHRNUL
 478#define strchrnul gitstrchrnul
 479static inline char *gitstrchrnul(const char *s, int c)
 480{
 481        while (*s && *s != c)
 482                s++;
 483        return (char *)s;
 484}
 485#endif
 486
 487#ifndef HAVE_MEMPCPY
 488#define mempcpy gitmempcpy
 489static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 490{
 491        return (char *)memcpy(dest, src, n) + n;
 492}
 493#endif
 494
 495#ifdef NO_INET_PTON
 496int inet_pton(int af, const char *src, void *dst);
 497#endif
 498
 499#ifdef NO_INET_NTOP
 500const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 501#endif
 502
 503extern void release_pack_memory(size_t, int);
 504
 505typedef void (*try_to_free_t)(size_t);
 506extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 507
 508extern char *xstrdup(const char *str);
 509extern void *xmalloc(size_t size);
 510extern void *xmallocz(size_t size);
 511extern void *xmemdupz(const void *data, size_t len);
 512extern char *xstrndup(const char *str, size_t len);
 513extern void *xrealloc(void *ptr, size_t size);
 514extern void *xcalloc(size_t nmemb, size_t size);
 515extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 516extern ssize_t xread(int fd, void *buf, size_t len);
 517extern ssize_t xwrite(int fd, const void *buf, size_t len);
 518extern int xdup(int fd);
 519extern FILE *xfdopen(int fd, const char *mode);
 520extern int xmkstemp(char *template);
 521extern int xmkstemp_mode(char *template, int mode);
 522extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 523extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 524
 525static inline size_t xsize_t(off_t len)
 526{
 527        if (len > (size_t) len)
 528                die("Cannot handle files this big");
 529        return (size_t)len;
 530}
 531
 532static inline int has_extension(const char *filename, const char *ext)
 533{
 534        size_t len = strlen(filename);
 535        size_t extlen = strlen(ext);
 536        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 537}
 538
 539/* in ctype.c, for kwset users */
 540extern const char tolower_trans_tbl[256];
 541
 542/* Sane ctype - no locale, and works with signed chars */
 543#undef isascii
 544#undef isspace
 545#undef isdigit
 546#undef isalpha
 547#undef isalnum
 548#undef isprint
 549#undef islower
 550#undef isupper
 551#undef tolower
 552#undef toupper
 553#undef iscntrl
 554#undef ispunct
 555#undef isxdigit
 556
 557extern const unsigned char sane_ctype[256];
 558#define GIT_SPACE 0x01
 559#define GIT_DIGIT 0x02
 560#define GIT_ALPHA 0x04
 561#define GIT_GLOB_SPECIAL 0x08
 562#define GIT_REGEX_SPECIAL 0x10
 563#define GIT_PATHSPEC_MAGIC 0x20
 564#define GIT_CNTRL 0x40
 565#define GIT_PUNCT 0x80
 566#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 567#define isascii(x) (((x) & ~0x7f) == 0)
 568#define isspace(x) sane_istest(x,GIT_SPACE)
 569#define isdigit(x) sane_istest(x,GIT_DIGIT)
 570#define isalpha(x) sane_istest(x,GIT_ALPHA)
 571#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 572#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 573#define islower(x) sane_iscase(x, 1)
 574#define isupper(x) sane_iscase(x, 0)
 575#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 576#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 577#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 578#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 579                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 580#define isxdigit(x) (hexval_table[x] != -1)
 581#define tolower(x) sane_case((unsigned char)(x), 0x20)
 582#define toupper(x) sane_case((unsigned char)(x), 0)
 583#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 584
 585static inline int sane_case(int x, int high)
 586{
 587        if (sane_istest(x, GIT_ALPHA))
 588                x = (x & ~0x20) | high;
 589        return x;
 590}
 591
 592static inline int sane_iscase(int x, int is_lower)
 593{
 594        if (!sane_istest(x, GIT_ALPHA))
 595                return 0;
 596
 597        if (is_lower)
 598                return (x & 0x20) != 0;
 599        else
 600                return (x & 0x20) == 0;
 601}
 602
 603static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 604{
 605        unsigned long ul;
 606        char *p;
 607
 608        errno = 0;
 609        ul = strtoul(s, &p, base);
 610        if (errno || *p || p == s || (unsigned int) ul != ul)
 611                return -1;
 612        *result = ul;
 613        return 0;
 614}
 615
 616static inline int strtol_i(char const *s, int base, int *result)
 617{
 618        long ul;
 619        char *p;
 620
 621        errno = 0;
 622        ul = strtol(s, &p, base);
 623        if (errno || *p || p == s || (int) ul != ul)
 624                return -1;
 625        *result = ul;
 626        return 0;
 627}
 628
 629#ifdef INTERNAL_QSORT
 630void git_qsort(void *base, size_t nmemb, size_t size,
 631               int(*compar)(const void *, const void *));
 632#define qsort git_qsort
 633#endif
 634
 635#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 636# define FORCE_DIR_SET_GID S_ISGID
 637#else
 638# define FORCE_DIR_SET_GID 0
 639#endif
 640
 641#ifdef NO_NSEC
 642#undef USE_NSEC
 643#define ST_CTIME_NSEC(st) 0
 644#define ST_MTIME_NSEC(st) 0
 645#else
 646#ifdef USE_ST_TIMESPEC
 647#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 648#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 649#else
 650#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 651#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 652#endif
 653#endif
 654
 655#ifdef UNRELIABLE_FSTAT
 656#define fstat_is_reliable() 0
 657#else
 658#define fstat_is_reliable() 1
 659#endif
 660
 661#ifndef va_copy
 662/*
 663 * Since an obvious implementation of va_list would be to make it a
 664 * pointer into the stack frame, a simple assignment will work on
 665 * many systems.  But let's try to be more portable.
 666 */
 667#ifdef __va_copy
 668#define va_copy(dst, src) __va_copy(dst, src)
 669#else
 670#define va_copy(dst, src) ((dst) = (src))
 671#endif
 672#endif
 673
 674/*
 675 * Preserves errno, prints a message, but gives no warning for ENOENT.
 676 * Always returns the return value of unlink(2).
 677 */
 678int unlink_or_warn(const char *path);
 679/*
 680 * Likewise for rmdir(2).
 681 */
 682int rmdir_or_warn(const char *path);
 683/*
 684 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 685 * the supplied file mode.
 686 */
 687int remove_or_warn(unsigned int mode, const char *path);
 688
 689/*
 690 * Call access(2), but warn for any error except "missing file"
 691 * (ENOENT or ENOTDIR).
 692 */
 693int access_or_warn(const char *path, int mode);
 694int access_or_die(const char *path, int mode);
 695
 696/* Warn on an inaccessible file that ought to be accessible */
 697void warn_on_inaccessible(const char *path);
 698
 699/* Get the passwd entry for the UID of the current process. */
 700struct passwd *xgetpwuid_self(void);
 701
 702#endif