git-compat-util.h

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