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