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_WINNT 0x0501
  90 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  91 #include <winsock2.h>
  92 #include <windows.h>
  93 #include <conio.h>
  94 #endif
  95
  96 #include <unistd.h>
  97 #include <stdio.h>
  98 #include <sys/stat.h>
  99 #include <fcntl.h>
 100 #include <stddef.h>
 101 #include <stdlib.h>
 102 #include <stdarg.h>
 103 #include <string.h>
 104 #ifdef __TANDEM /* or HAVE_STRINGS_H or !NO_STRINGS_H? */
 105 #include <strings.h> /* for strcasecmp() */
 106 #endif
 107 #include <errno.h>
 108 #include <limits.h>
 109 #include <sys/param.h>
 110 #include <sys/types.h>
 111 #include <dirent.h>
 112 #include <sys/time.h>
 113 #include <time.h>
 114 #include <signal.h>
 115 #include <fnmatch.h>
 116 #include <assert.h>
 117 #include <regex.h>
 118 #include <utime.h>
 119 #include <syslog.h>
 120 #ifndef NO_SYS_POLL_H
 121 #include <sys/poll.h>
 122 #else
 123 #include <poll.h>
 124 #endif
 125 #if defined(__MINGW32__)
 126 /* pull in Windows compatibility stuff */
 127 #include "compat/mingw.h"
 128 #elif defined(_MSC_VER)
 129 #include "compat/msvc.h"
 130 #else
 131 #include <sys/wait.h>
 132 #include <sys/resource.h>
 133 #include <sys/socket.h>
 134 #include <sys/ioctl.h>
 135 #include <termios.h>
 136 #ifndef NO_SYS_SELECT_H
 137 #include <sys/select.h>
 138 #endif
 139 #include <netinet/in.h>
 140 #include <netinet/tcp.h>
 141 #include <arpa/inet.h>
 142 #include <netdb.h>
 143 #include <pwd.h>
 144 #include <sys/un.h>
 145 #ifndef NO_INTTYPES_H
 146 #include <inttypes.h>
 147 #else
 148 #include <stdint.h>
 149 #endif
 150 #ifdef NO_INTPTR_T
 151 /*
 152  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 153  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 154  * while on IP16 and IP16L32 it is "int" (resp. "short")
 155  * Size needs to match (or exceed) 'sizeof(void *)'.
 156  * We can't take "long long" here as not everybody has it.
 157  */
 158 typedef long intptr_t;
 159 typedef unsigned long uintptr_t;
 160 #endif
 161 #if defined(__CYGWIN__)
 162 #undef _XOPEN_SOURCE
 163 #include <grp.h>
 164 #define _XOPEN_SOURCE 600
 165 #include "compat/cygwin.h"
 166 #else
 167 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 168 #include <grp.h>
 169 #define _ALL_SOURCE 1
 170 #endif
 171 #endif
 172
 173 /* used on Mac OS X */
 174 #ifdef PRECOMPOSE_UNICODE
 175 #include "compat/precompose_utf8.h"
 176 #else
 177 #define precompose_str(in,i_nfd2nfc)
 178 #define precompose_argv(c,v)
 179 #define probe_utf8_pathname_composition(a,b)
 180 #endif
 181
 182 #ifdef MKDIR_WO_TRAILING_SLASH
 183 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 184 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 185 #endif
 186
 187 #ifdef NO_STRUCT_ITIMERVAL
 188 struct itimerval {
 189         struct timeval it_interval;
 190         struct timeval it_value;
 191 }
 192 #endif
 193
 194 #ifdef NO_SETITIMER
 195 #define setitimer(which,value,ovalue)
 196 #endif
 197
 198 #ifndef NO_LIBGEN_H
 199 #include <libgen.h>
 200 #else
 201 #define basename gitbasename
 202 extern char *gitbasename(char *);
 203 #endif
 204
 205 #ifndef NO_ICONV
 206 #include <iconv.h>
 207 #endif
 208
 209 #ifndef NO_OPENSSL
 210 #include <openssl/ssl.h>
 211 #include <openssl/err.h>
 212 #endif
 213
 214 /* On most systems <limits.h> would have given us this, but
 215  * not on some systems (e.g. GNU/Hurd).
 216  */
 217 #ifndef PATH_MAX
 218 #define PATH_MAX 4096
 219 #endif
 220
 221 #ifndef PRIuMAX
 222 #define PRIuMAX "llu"
 223 #endif
 224
 225 #ifndef PRIu32
 226 #define PRIu32 "u"
 227 #endif
 228
 229 #ifndef PRIx32
 230 #define PRIx32 "x"
 231 #endif
 232
 233 #ifndef PRIo32
 234 #define PRIo32 "o"
 235 #endif
 236
 237 #ifndef PATH_SEP
 238 #define PATH_SEP ':'
 239 #endif
 240
 241 #ifdef HAVE_PATHS_H
 242 #include <paths.h>
 243 #endif
 244 #ifndef _PATH_DEFPATH
 245 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 246 #endif
 247
 248 #ifndef STRIP_EXTENSION
 249 #define STRIP_EXTENSION ""
 250 #endif
 251
 252 #ifndef has_dos_drive_prefix
 253 #define has_dos_drive_prefix(path) 0
 254 #endif
 255
 256 #ifndef offset_1st_component
 257 #define offset_1st_component(path) (is_dir_sep((path)[0]))
 258 #endif
 259
 260 #ifndef is_dir_sep
 261 #define is_dir_sep(c) ((c) == '/')
 262 #endif
 263
 264 #ifndef find_last_dir_sep
 265 #define find_last_dir_sep(path) strrchr(path, '/')
 266 #endif
 267
 268 #if defined(__HP_cc) && (__HP_cc >= 61000)
 269 #define NORETURN __attribute__((noreturn))
 270 #define NORETURN_PTR
 271 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 272 #define NORETURN __attribute__((__noreturn__))
 273 #define NORETURN_PTR __attribute__((__noreturn__))
 274 #elif defined(_MSC_VER)
 275 #define NORETURN __declspec(noreturn)
 276 #define NORETURN_PTR
 277 #else
 278 #define NORETURN
 279 #define NORETURN_PTR
 280 #ifndef __attribute__
 281 #define __attribute__(x)
 282 #endif
 283 #endif
 284
 285 #include "compat/bswap.h"
 286
 287 /* General helper functions */
 288 extern void vreportf(const char *prefix, const char *err, va_list params);
 289 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 290 extern NORETURN void usage(const char *err);
 291 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 292 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 293 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 294 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 295 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 296
 297 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 298 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 299
 300 extern int prefixcmp(const char *str, const char *prefix);
 301 extern int suffixcmp(const char *str, const char *suffix);
 302
 303 static inline const char *skip_prefix(const char *str, const char *prefix)
 304 {
 305         size_t len = strlen(prefix);
 306         return strncmp(str, prefix, len) ? NULL : str + len;
 307 }
 308
 309 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 310
 311 #ifndef PROT_READ
 312 #define PROT_READ 1
 313 #define PROT_WRITE 2
 314 #define MAP_PRIVATE 1
 315 #endif
 316
 317 #define mmap git_mmap
 318 #define munmap git_munmap
 319 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 320 extern int git_munmap(void *start, size_t length);
 321
 322 #else /* NO_MMAP || USE_WIN32_MMAP */
 323
 324 #include <sys/mman.h>
 325
 326 #endif /* NO_MMAP || USE_WIN32_MMAP */
 327
 328 #ifdef NO_MMAP
 329
 330 /* This value must be multiple of (pagesize * 2) */
 331 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 332
 333 #else /* NO_MMAP */
 334
 335 /* This value must be multiple of (pagesize * 2) */
 336 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 337         (sizeof(void*) >= 8 \
 338                 ?  1 * 1024 * 1024 * 1024 \
 339                 : 32 * 1024 * 1024)
 340
 341 #endif /* NO_MMAP */
 342
 343 #ifndef MAP_FAILED
 344 #define MAP_FAILED ((void *)-1)
 345 #endif
 346
 347 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 348 #define on_disk_bytes(st) ((st).st_size)
 349 #else
 350 #define on_disk_bytes(st) ((st).st_blocks * 512)
 351 #endif
 352
 353 #define DEFAULT_PACKED_GIT_LIMIT \
 354         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 355
 356 #ifdef NO_PREAD
 357 #define pread git_pread
 358 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 359 #endif
 360 /*
 361  * Forward decl that will remind us if its twin in cache.h changes.
 362  * This function is used in compat/pread.c.  But we can't include
 363  * cache.h there.
 364  */
 365 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 366
 367 #ifdef NO_SETENV
 368 #define setenv gitsetenv
 369 extern int gitsetenv(const char *, const char *, int);
 370 #endif
 371
 372 #ifdef NO_MKDTEMP
 373 #define mkdtemp gitmkdtemp
 374 extern char *gitmkdtemp(char *);
 375 #endif
 376
 377 #ifdef NO_MKSTEMPS
 378 #define mkstemps gitmkstemps
 379 extern int gitmkstemps(char *, int);
 380 #endif
 381
 382 #ifdef NO_UNSETENV
 383 #define unsetenv gitunsetenv
 384 extern void gitunsetenv(const char *);
 385 #endif
 386
 387 #ifdef NO_STRCASESTR
 388 #define strcasestr gitstrcasestr
 389 extern char *gitstrcasestr(const char *haystack, const char *needle);
 390 #endif
 391
 392 #ifdef NO_STRLCPY
 393 #define strlcpy gitstrlcpy
 394 extern size_t gitstrlcpy(char *, const char *, size_t);
 395 #endif
 396
 397 #ifdef NO_STRTOUMAX
 398 #define strtoumax gitstrtoumax
 399 extern uintmax_t gitstrtoumax(const char *, char **, int);
 400 #define strtoimax gitstrtoimax
 401 extern intmax_t gitstrtoimax(const char *, char **, int);
 402 #endif
 403
 404 #ifdef NO_STRTOK_R
 405 #define strtok_r gitstrtok_r
 406 extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
 407 #endif
 408
 409 #ifdef NO_HSTRERROR
 410 #define hstrerror githstrerror
 411 extern const char *githstrerror(int herror);
 412 #endif
 413
 414 #ifdef NO_MEMMEM
 415 #define memmem gitmemmem
 416 void *gitmemmem(const void *haystack, size_t haystacklen,
 417                 const void *needle, size_t needlelen);
 418 #endif
 419
 420 #ifdef FREAD_READS_DIRECTORIES
 421 #ifdef fopen
 422 #undef fopen
 423 #endif
 424 #define fopen(a,b) git_fopen(a,b)
 425 extern FILE *git_fopen(const char*, const char*);
 426 #endif
 427
 428 #ifdef SNPRINTF_RETURNS_BOGUS
 429 #define snprintf git_snprintf
 430 extern int git_snprintf(char *str, size_t maxsize,
 431                         const char *format, ...);
 432 #define vsnprintf git_vsnprintf
 433 extern int git_vsnprintf(char *str, size_t maxsize,
 434                          const char *format, va_list ap);
 435 #endif
 436
 437 #ifdef __GLIBC_PREREQ
 438 #if __GLIBC_PREREQ(2, 1)
 439 #define HAVE_STRCHRNUL
 440 #define HAVE_MEMPCPY
 441 #endif
 442 #endif
 443
 444 #ifndef HAVE_STRCHRNUL
 445 #define strchrnul gitstrchrnul
 446 static inline char *gitstrchrnul(const char *s, int c)
 447 {
 448         while (*s && *s != c)
 449                 s++;
 450         return (char *)s;
 451 }
 452 #endif
 453
 454 #ifndef HAVE_MEMPCPY
 455 #define mempcpy gitmempcpy
 456 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 457 {
 458         return (char *)memcpy(dest, src, n) + n;
 459 }
 460 #endif
 461
 462 #ifdef NO_INET_PTON
 463 int inet_pton(int af, const char *src, void *dst);
 464 #endif
 465
 466 #ifdef NO_INET_NTOP
 467 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 468 #endif
 469
 470 extern void release_pack_memory(size_t, int);
 471
 472 typedef void (*try_to_free_t)(size_t);
 473 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 474
 475 extern char *xstrdup(const char *str);
 476 extern void *xmalloc(size_t size);
 477 extern void *xmallocz(size_t size);
 478 extern void *xmemdupz(const void *data, size_t len);
 479 extern char *xstrndup(const char *str, size_t len);
 480 extern void *xrealloc(void *ptr, size_t size);
 481 extern void *xcalloc(size_t nmemb, size_t size);
 482 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 483 extern ssize_t xread(int fd, void *buf, size_t len);
 484 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 485 extern int xdup(int fd);
 486 extern FILE *xfdopen(int fd, const char *mode);
 487 extern int xmkstemp(char *template);
 488 extern int xmkstemp_mode(char *template, int mode);
 489 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 490 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 491
 492 static inline size_t xsize_t(off_t len)
 493 {
 494         if (len > (size_t) len)
 495                 die("Cannot handle files this big");
 496         return (size_t)len;
 497 }
 498
 499 static inline int has_extension(const char *filename, const char *ext)
 500 {
 501         size_t len = strlen(filename);
 502         size_t extlen = strlen(ext);
 503         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 504 }
 505
 506 /* in ctype.c, for kwset users */
 507 extern const char tolower_trans_tbl[256];
 508
 509 /* Sane ctype - no locale, and works with signed chars */
 510 #undef isascii
 511 #undef isspace
 512 #undef isdigit
 513 #undef isalpha
 514 #undef isalnum
 515 #undef islower
 516 #undef isupper
 517 #undef tolower
 518 #undef toupper
 519 extern unsigned char sane_ctype[256];
 520 #define GIT_SPACE 0x01
 521 #define GIT_DIGIT 0x02
 522 #define GIT_ALPHA 0x04
 523 #define GIT_GLOB_SPECIAL 0x08
 524 #define GIT_REGEX_SPECIAL 0x10
 525 #define GIT_PATHSPEC_MAGIC 0x20
 526 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 527 #define isascii(x) (((x) & ~0x7f) == 0)
 528 #define isspace(x) sane_istest(x,GIT_SPACE)
 529 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 530 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 531 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 532 #define islower(x) sane_iscase(x, 1)
 533 #define isupper(x) sane_iscase(x, 0)
 534 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 535 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 536 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 537 #define toupper(x) sane_case((unsigned char)(x), 0)
 538 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 539
 540 static inline int sane_case(int x, int high)
 541 {
 542         if (sane_istest(x, GIT_ALPHA))
 543                 x = (x & ~0x20) | high;
 544         return x;
 545 }
 546
 547 static inline int sane_iscase(int x, int is_lower)
 548 {
 549         if (!sane_istest(x, GIT_ALPHA))
 550                 return 0;
 551
 552         if (is_lower)
 553                 return (x & 0x20) != 0;
 554         else
 555                 return (x & 0x20) == 0;
 556 }
 557
 558 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 559 {
 560         unsigned long ul;
 561         char *p;
 562
 563         errno = 0;
 564         ul = strtoul(s, &p, base);
 565         if (errno || *p || p == s || (unsigned int) ul != ul)
 566                 return -1;
 567         *result = ul;
 568         return 0;
 569 }
 570
 571 static inline int strtol_i(char const *s, int base, int *result)
 572 {
 573         long ul;
 574         char *p;
 575
 576         errno = 0;
 577         ul = strtol(s, &p, base);
 578         if (errno || *p || p == s || (int) ul != ul)
 579                 return -1;
 580         *result = ul;
 581         return 0;
 582 }
 583
 584 #ifdef INTERNAL_QSORT
 585 void git_qsort(void *base, size_t nmemb, size_t size,
 586                int(*compar)(const void *, const void *));
 587 #define qsort git_qsort
 588 #endif
 589
 590 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 591 # define FORCE_DIR_SET_GID S_ISGID
 592 #else
 593 # define FORCE_DIR_SET_GID 0
 594 #endif
 595
 596 #ifdef NO_NSEC
 597 #undef USE_NSEC
 598 #define ST_CTIME_NSEC(st) 0
 599 #define ST_MTIME_NSEC(st) 0
 600 #else
 601 #ifdef USE_ST_TIMESPEC
 602 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 603 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 604 #else
 605 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 606 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 607 #endif
 608 #endif
 609
 610 #ifdef UNRELIABLE_FSTAT
 611 #define fstat_is_reliable() 0
 612 #else
 613 #define fstat_is_reliable() 1
 614 #endif
 615
 616 #ifndef va_copy
 617 /*
 618  * Since an obvious implementation of va_list would be to make it a
 619  * pointer into the stack frame, a simple assignment will work on
 620  * many systems.  But let's try to be more portable.
 621  */
 622 #ifdef __va_copy
 623 #define va_copy(dst, src) __va_copy(dst, src)
 624 #else
 625 #define va_copy(dst, src) ((dst) = (src))
 626 #endif
 627 #endif
 628
 629 /*
 630  * Preserves errno, prints a message, but gives no warning for ENOENT.
 631  * Always returns the return value of unlink(2).
 632  */
 633 int unlink_or_warn(const char *path);
 634 /*
 635  * Likewise for rmdir(2).
 636  */
 637 int rmdir_or_warn(const char *path);
 638 /*
 639  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 640  * the supplied file mode.
 641  */
 642 int remove_or_warn(unsigned int mode, const char *path);
 643
 644 /* Call access(2), but warn for any error besides ENOENT. */
 645 int access_or_warn(const char *path, int mode);
 646
 647 /* Warn on an inaccessible file that ought to be accessible */
 648 void warn_on_inaccessible(const char *path);
 649
 650 /* Get the passwd entry for the UID of the current process. */
 651 struct passwd *xgetpwuid_self(void);
 652
 653 #ifndef mark_as_git_dir
 654 #define mark_as_git_dir(x) /* noop */
 655 #endif
 656
 657 #ifndef get_home_directory
 658 #define get_home_directory() getenv("HOME")
 659 #endif
 660
 661 #endif