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#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  90#include <winsock2.h>
  91#include <windows.h>
  92#endif
  93
  94#include <unistd.h>
  95#include <stdio.h>
  96#include <sys/stat.h>
  97#include <fcntl.h>
  98#include <stddef.h>
  99#include <stdlib.h>
 100#include <stdarg.h>
 101#include <string.h>
 102#ifdef HAVE_STRINGS_H
 103#include <strings.h> /* for strcasecmp() */
 104#endif
 105#include <errno.h>
 106#include <limits.h>
 107#ifdef NEEDS_SYS_PARAM_H
 108#include <sys/param.h>
 109#endif
 110#include <sys/types.h>
 111#include <dirent.h>
 112#include <sys/time.h>
 113#include <time.h>
 114#include <signal.h>
 115#ifndef USE_WILDMATCH
 116#include <fnmatch.h>
 117#endif
 118#include <assert.h>
 119#include <regex.h>
 120#include <utime.h>
 121#include <syslog.h>
 122#ifndef NO_SYS_POLL_H
 123#include <sys/poll.h>
 124#else
 125#include <poll.h>
 126#endif
 127#if defined(__MINGW32__)
 128/* pull in Windows compatibility stuff */
 129#include "compat/mingw.h"
 130#elif defined(_MSC_VER)
 131#include "compat/msvc.h"
 132#else
 133#include <sys/wait.h>
 134#include <sys/resource.h>
 135#include <sys/socket.h>
 136#include <sys/ioctl.h>
 137#include <termios.h>
 138#ifndef NO_SYS_SELECT_H
 139#include <sys/select.h>
 140#endif
 141#include <netinet/in.h>
 142#include <netinet/tcp.h>
 143#include <arpa/inet.h>
 144#include <netdb.h>
 145#include <pwd.h>
 146#include <sys/un.h>
 147#ifndef NO_INTTYPES_H
 148#include <inttypes.h>
 149#else
 150#include <stdint.h>
 151#endif
 152#ifdef NO_INTPTR_T
 153/*
 154 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 155 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 156 * while on IP16 and IP16L32 it is "int" (resp. "short")
 157 * Size needs to match (or exceed) 'sizeof(void *)'.
 158 * We can't take "long long" here as not everybody has it.
 159 */
 160typedef long intptr_t;
 161typedef unsigned long uintptr_t;
 162#endif
 163#if defined(__CYGWIN__)
 164#undef _XOPEN_SOURCE
 165#include <grp.h>
 166#define _XOPEN_SOURCE 600
 167#include "compat/cygwin.h"
 168#else
 169#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 170#include <grp.h>
 171#define _ALL_SOURCE 1
 172#endif
 173#endif
 174
 175/* used on Mac OS X */
 176#ifdef PRECOMPOSE_UNICODE
 177#include "compat/precompose_utf8.h"
 178#else
 179#define precompose_str(in,i_nfd2nfc)
 180#define precompose_argv(c,v)
 181#define probe_utf8_pathname_composition(a,b)
 182#endif
 183
 184#ifdef MKDIR_WO_TRAILING_SLASH
 185#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 186extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 187#endif
 188
 189#ifdef NO_STRUCT_ITIMERVAL
 190struct itimerval {
 191        struct timeval it_interval;
 192        struct timeval it_value;
 193}
 194#endif
 195
 196#ifdef NO_SETITIMER
 197#define setitimer(which,value,ovalue)
 198#endif
 199
 200#ifndef NO_LIBGEN_H
 201#include <libgen.h>
 202#else
 203#define basename gitbasename
 204extern char *gitbasename(char *);
 205#endif
 206
 207#ifndef NO_ICONV
 208#include <iconv.h>
 209#endif
 210
 211#ifndef NO_OPENSSL
 212#include <openssl/ssl.h>
 213#include <openssl/err.h>
 214#endif
 215
 216/* On most systems <limits.h> would have given us this, but
 217 * not on some systems (e.g. GNU/Hurd).
 218 */
 219#ifndef PATH_MAX
 220#define PATH_MAX 4096
 221#endif
 222
 223#ifndef PRIuMAX
 224#define PRIuMAX "llu"
 225#endif
 226
 227#ifndef PRIu32
 228#define PRIu32 "u"
 229#endif
 230
 231#ifndef PRIx32
 232#define PRIx32 "x"
 233#endif
 234
 235#ifndef PRIo32
 236#define PRIo32 "o"
 237#endif
 238
 239#ifndef PATH_SEP
 240#define PATH_SEP ':'
 241#endif
 242
 243#ifdef HAVE_PATHS_H
 244#include <paths.h>
 245#endif
 246#ifndef _PATH_DEFPATH
 247#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 248#endif
 249
 250#ifndef STRIP_EXTENSION
 251#define STRIP_EXTENSION ""
 252#endif
 253
 254#ifndef has_dos_drive_prefix
 255#define has_dos_drive_prefix(path) 0
 256#endif
 257
 258#ifndef is_dir_sep
 259#define is_dir_sep(c) ((c) == '/')
 260#endif
 261
 262#ifndef find_last_dir_sep
 263#define find_last_dir_sep(path) strrchr(path, '/')
 264#endif
 265
 266#if defined(__HP_cc) && (__HP_cc >= 61000)
 267#define NORETURN __attribute__((noreturn))
 268#define NORETURN_PTR
 269#elif defined(__GNUC__) && !defined(NO_NORETURN)
 270#define NORETURN __attribute__((__noreturn__))
 271#define NORETURN_PTR __attribute__((__noreturn__))
 272#elif defined(_MSC_VER)
 273#define NORETURN __declspec(noreturn)
 274#define NORETURN_PTR
 275#else
 276#define NORETURN
 277#define NORETURN_PTR
 278#ifndef __attribute__
 279#define __attribute__(x)
 280#endif
 281#endif
 282
 283#include "compat/bswap.h"
 284
 285#ifdef USE_WILDMATCH
 286#include "wildmatch.h"
 287#define FNM_PATHNAME WM_PATHNAME
 288#define FNM_CASEFOLD WM_CASEFOLD
 289#define FNM_NOMATCH  WM_NOMATCH
 290static inline int fnmatch(const char *pattern, const char *string, int flags)
 291{
 292        return wildmatch(pattern, string, flags, NULL);
 293}
 294#endif
 295
 296/* General helper functions */
 297extern void vreportf(const char *prefix, const char *err, va_list params);
 298extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 299extern NORETURN void usage(const char *err);
 300extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 301extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 302extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 303extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 304extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 305
 306/*
 307 * Let callers be aware of the constant return value; this can help
 308 * gcc with -Wuninitialized analysis. We have to restrict this trick to
 309 * gcc, though, because of the variadic macro and the magic ## comma pasting
 310 * behavior. But since we're only trying to help gcc, anyway, it's OK; other
 311 * compilers will fall back to using the function as usual.
 312 */
 313#if defined(__GNUC__) && ! defined(__clang__)
 314#define error(fmt, ...) (error((fmt), ##__VA_ARGS__), -1)
 315#endif
 316
 317extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 318extern void set_error_routine(void (*routine)(const char *err, va_list params));
 319
 320extern int prefixcmp(const char *str, const char *prefix);
 321extern int suffixcmp(const char *str, const char *suffix);
 322
 323static inline const char *skip_prefix(const char *str, const char *prefix)
 324{
 325        size_t len = strlen(prefix);
 326        return strncmp(str, prefix, len) ? NULL : str + len;
 327}
 328
 329#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 330
 331#ifndef PROT_READ
 332#define PROT_READ 1
 333#define PROT_WRITE 2
 334#define MAP_PRIVATE 1
 335#endif
 336
 337#define mmap git_mmap
 338#define munmap git_munmap
 339extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 340extern int git_munmap(void *start, size_t length);
 341
 342#else /* NO_MMAP || USE_WIN32_MMAP */
 343
 344#include <sys/mman.h>
 345
 346#endif /* NO_MMAP || USE_WIN32_MMAP */
 347
 348#ifdef NO_MMAP
 349
 350/* This value must be multiple of (pagesize * 2) */
 351#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 352
 353#else /* NO_MMAP */
 354
 355/* This value must be multiple of (pagesize * 2) */
 356#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 357        (sizeof(void*) >= 8 \
 358                ?  1 * 1024 * 1024 * 1024 \
 359                : 32 * 1024 * 1024)
 360
 361#endif /* NO_MMAP */
 362
 363#ifndef MAP_FAILED
 364#define MAP_FAILED ((void *)-1)
 365#endif
 366
 367#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 368#define on_disk_bytes(st) ((st).st_size)
 369#else
 370#define on_disk_bytes(st) ((st).st_blocks * 512)
 371#endif
 372
 373#define DEFAULT_PACKED_GIT_LIMIT \
 374        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 375
 376#ifdef NO_PREAD
 377#define pread git_pread
 378extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 379#endif
 380/*
 381 * Forward decl that will remind us if its twin in cache.h changes.
 382 * This function is used in compat/pread.c.  But we can't include
 383 * cache.h there.
 384 */
 385extern ssize_t read_in_full(int fd, void *buf, size_t count);
 386
 387#ifdef NO_SETENV
 388#define setenv gitsetenv
 389extern int gitsetenv(const char *, const char *, int);
 390#endif
 391
 392#ifdef NO_MKDTEMP
 393#define mkdtemp gitmkdtemp
 394extern char *gitmkdtemp(char *);
 395#endif
 396
 397#ifdef NO_MKSTEMPS
 398#define mkstemps gitmkstemps
 399extern int gitmkstemps(char *, int);
 400#endif
 401
 402#ifdef NO_UNSETENV
 403#define unsetenv gitunsetenv
 404extern void gitunsetenv(const char *);
 405#endif
 406
 407#ifdef NO_STRCASESTR
 408#define strcasestr gitstrcasestr
 409extern char *gitstrcasestr(const char *haystack, const char *needle);
 410#endif
 411
 412#ifdef NO_STRLCPY
 413#define strlcpy gitstrlcpy
 414extern size_t gitstrlcpy(char *, const char *, size_t);
 415#endif
 416
 417#ifdef NO_STRTOUMAX
 418#define strtoumax gitstrtoumax
 419extern uintmax_t gitstrtoumax(const char *, char **, int);
 420#define strtoimax gitstrtoimax
 421extern intmax_t gitstrtoimax(const char *, char **, int);
 422#endif
 423
 424#ifdef NO_STRTOK_R
 425#define strtok_r gitstrtok_r
 426extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
 427#endif
 428
 429#ifdef NO_HSTRERROR
 430#define hstrerror githstrerror
 431extern const char *githstrerror(int herror);
 432#endif
 433
 434#ifdef NO_MEMMEM
 435#define memmem gitmemmem
 436void *gitmemmem(const void *haystack, size_t haystacklen,
 437                const void *needle, size_t needlelen);
 438#endif
 439
 440#ifdef NO_GETPAGESIZE
 441#define getpagesize() sysconf(_SC_PAGESIZE)
 442#endif
 443
 444#ifdef FREAD_READS_DIRECTORIES
 445#ifdef fopen
 446#undef fopen
 447#endif
 448#define fopen(a,b) git_fopen(a,b)
 449extern FILE *git_fopen(const char*, const char*);
 450#endif
 451
 452#ifdef SNPRINTF_RETURNS_BOGUS
 453#define snprintf git_snprintf
 454extern int git_snprintf(char *str, size_t maxsize,
 455                        const char *format, ...);
 456#define vsnprintf git_vsnprintf
 457extern int git_vsnprintf(char *str, size_t maxsize,
 458                         const char *format, va_list ap);
 459#endif
 460
 461#ifdef __GLIBC_PREREQ
 462#if __GLIBC_PREREQ(2, 1)
 463#define HAVE_STRCHRNUL
 464#define HAVE_MEMPCPY
 465#endif
 466#endif
 467
 468#ifndef HAVE_STRCHRNUL
 469#define strchrnul gitstrchrnul
 470static inline char *gitstrchrnul(const char *s, int c)
 471{
 472        while (*s && *s != c)
 473                s++;
 474        return (char *)s;
 475}
 476#endif
 477
 478#ifndef HAVE_MEMPCPY
 479#define mempcpy gitmempcpy
 480static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 481{
 482        return (char *)memcpy(dest, src, n) + n;
 483}
 484#endif
 485
 486#ifdef NO_INET_PTON
 487int inet_pton(int af, const char *src, void *dst);
 488#endif
 489
 490#ifdef NO_INET_NTOP
 491const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 492#endif
 493
 494extern void release_pack_memory(size_t, int);
 495
 496typedef void (*try_to_free_t)(size_t);
 497extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 498
 499extern char *xstrdup(const char *str);
 500extern void *xmalloc(size_t size);
 501extern void *xmallocz(size_t size);
 502extern void *xmemdupz(const void *data, size_t len);
 503extern char *xstrndup(const char *str, size_t len);
 504extern void *xrealloc(void *ptr, size_t size);
 505extern void *xcalloc(size_t nmemb, size_t size);
 506extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 507extern ssize_t xread(int fd, void *buf, size_t len);
 508extern ssize_t xwrite(int fd, const void *buf, size_t len);
 509extern int xdup(int fd);
 510extern FILE *xfdopen(int fd, const char *mode);
 511extern int xmkstemp(char *template);
 512extern int xmkstemp_mode(char *template, int mode);
 513extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 514extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 515
 516static inline size_t xsize_t(off_t len)
 517{
 518        if (len > (size_t) len)
 519                die("Cannot handle files this big");
 520        return (size_t)len;
 521}
 522
 523static inline int has_extension(const char *filename, const char *ext)
 524{
 525        size_t len = strlen(filename);
 526        size_t extlen = strlen(ext);
 527        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 528}
 529
 530/* in ctype.c, for kwset users */
 531extern const char tolower_trans_tbl[256];
 532
 533/* Sane ctype - no locale, and works with signed chars */
 534#undef isascii
 535#undef isspace
 536#undef isdigit
 537#undef isalpha
 538#undef isalnum
 539#undef isprint
 540#undef islower
 541#undef isupper
 542#undef tolower
 543#undef toupper
 544#undef iscntrl
 545#undef ispunct
 546#undef isxdigit
 547
 548extern const unsigned char sane_ctype[256];
 549#define GIT_SPACE 0x01
 550#define GIT_DIGIT 0x02
 551#define GIT_ALPHA 0x04
 552#define GIT_GLOB_SPECIAL 0x08
 553#define GIT_REGEX_SPECIAL 0x10
 554#define GIT_PATHSPEC_MAGIC 0x20
 555#define GIT_CNTRL 0x40
 556#define GIT_PUNCT 0x80
 557#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 558#define isascii(x) (((x) & ~0x7f) == 0)
 559#define isspace(x) sane_istest(x,GIT_SPACE)
 560#define isdigit(x) sane_istest(x,GIT_DIGIT)
 561#define isalpha(x) sane_istest(x,GIT_ALPHA)
 562#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 563#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 564#define islower(x) sane_iscase(x, 1)
 565#define isupper(x) sane_iscase(x, 0)
 566#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 567#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 568#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 569#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 570                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 571#define isxdigit(x) (hexval_table[x] != -1)
 572#define tolower(x) sane_case((unsigned char)(x), 0x20)
 573#define toupper(x) sane_case((unsigned char)(x), 0)
 574#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 575
 576static inline int sane_case(int x, int high)
 577{
 578        if (sane_istest(x, GIT_ALPHA))
 579                x = (x & ~0x20) | high;
 580        return x;
 581}
 582
 583static inline int sane_iscase(int x, int is_lower)
 584{
 585        if (!sane_istest(x, GIT_ALPHA))
 586                return 0;
 587
 588        if (is_lower)
 589                return (x & 0x20) != 0;
 590        else
 591                return (x & 0x20) == 0;
 592}
 593
 594static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 595{
 596        unsigned long ul;
 597        char *p;
 598
 599        errno = 0;
 600        ul = strtoul(s, &p, base);
 601        if (errno || *p || p == s || (unsigned int) ul != ul)
 602                return -1;
 603        *result = ul;
 604        return 0;
 605}
 606
 607static inline int strtol_i(char const *s, int base, int *result)
 608{
 609        long ul;
 610        char *p;
 611
 612        errno = 0;
 613        ul = strtol(s, &p, base);
 614        if (errno || *p || p == s || (int) ul != ul)
 615                return -1;
 616        *result = ul;
 617        return 0;
 618}
 619
 620#ifdef INTERNAL_QSORT
 621void git_qsort(void *base, size_t nmemb, size_t size,
 622               int(*compar)(const void *, const void *));
 623#define qsort git_qsort
 624#endif
 625
 626#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 627# define FORCE_DIR_SET_GID S_ISGID
 628#else
 629# define FORCE_DIR_SET_GID 0
 630#endif
 631
 632#ifdef NO_NSEC
 633#undef USE_NSEC
 634#define ST_CTIME_NSEC(st) 0
 635#define ST_MTIME_NSEC(st) 0
 636#else
 637#ifdef USE_ST_TIMESPEC
 638#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 639#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 640#else
 641#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 642#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 643#endif
 644#endif
 645
 646#ifdef UNRELIABLE_FSTAT
 647#define fstat_is_reliable() 0
 648#else
 649#define fstat_is_reliable() 1
 650#endif
 651
 652#ifndef va_copy
 653/*
 654 * Since an obvious implementation of va_list would be to make it a
 655 * pointer into the stack frame, a simple assignment will work on
 656 * many systems.  But let's try to be more portable.
 657 */
 658#ifdef __va_copy
 659#define va_copy(dst, src) __va_copy(dst, src)
 660#else
 661#define va_copy(dst, src) ((dst) = (src))
 662#endif
 663#endif
 664
 665/*
 666 * Preserves errno, prints a message, but gives no warning for ENOENT.
 667 * Always returns the return value of unlink(2).
 668 */
 669int unlink_or_warn(const char *path);
 670/*
 671 * Likewise for rmdir(2).
 672 */
 673int rmdir_or_warn(const char *path);
 674/*
 675 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 676 * the supplied file mode.
 677 */
 678int remove_or_warn(unsigned int mode, const char *path);
 679
 680/*
 681 * Call access(2), but warn for any error except "missing file"
 682 * (ENOENT or ENOTDIR).
 683 */
 684int access_or_warn(const char *path, int mode);
 685int access_or_die(const char *path, int mode);
 686
 687/* Warn on an inaccessible file that ought to be accessible */
 688void warn_on_inaccessible(const char *path);
 689
 690/* Get the passwd entry for the UID of the current process. */
 691struct passwd *xgetpwuid_self(void);
 692
 693#endif