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 offset_1st_component
 255 #define offset_1st_component(path) (is_dir_sep((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 /* General helper functions */
 286 extern void vreportf(const char *prefix, const char *err, va_list params);
 287 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 288 extern NORETURN void usage(const char *err);
 289 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 290 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 291 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 292 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 293 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 294
 295 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 296 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 297
 298 extern int prefixcmp(const char *str, const char *prefix);
 299 extern int suffixcmp(const char *str, const char *suffix);
 300
 301 static inline const char *skip_prefix(const char *str, const char *prefix)
 302 {
 303         size_t len = strlen(prefix);
 304         return strncmp(str, prefix, len) ? NULL : str + len;
 305 }
 306
 307 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 308
 309 #ifndef PROT_READ
 310 #define PROT_READ 1
 311 #define PROT_WRITE 2
 312 #define MAP_PRIVATE 1
 313 #endif
 314
 315 #define mmap git_mmap
 316 #define munmap git_munmap
 317 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 318 extern int git_munmap(void *start, size_t length);
 319
 320 #else /* NO_MMAP || USE_WIN32_MMAP */
 321
 322 #include <sys/mman.h>
 323
 324 #endif /* NO_MMAP || USE_WIN32_MMAP */
 325
 326 #ifdef NO_MMAP
 327
 328 /* This value must be multiple of (pagesize * 2) */
 329 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 330
 331 #else /* NO_MMAP */
 332
 333 /* This value must be multiple of (pagesize * 2) */
 334 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 335         (sizeof(void*) >= 8 \
 336                 ?  1 * 1024 * 1024 * 1024 \
 337                 : 32 * 1024 * 1024)
 338
 339 #endif /* NO_MMAP */
 340
 341 #ifndef MAP_FAILED
 342 #define MAP_FAILED ((void *)-1)
 343 #endif
 344
 345 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 346 #define on_disk_bytes(st) ((st).st_size)
 347 #else
 348 #define on_disk_bytes(st) ((st).st_blocks * 512)
 349 #endif
 350
 351 #define DEFAULT_PACKED_GIT_LIMIT \
 352         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 353
 354 #ifdef NO_PREAD
 355 #define pread git_pread
 356 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 357 #endif
 358 /*
 359  * Forward decl that will remind us if its twin in cache.h changes.
 360  * This function is used in compat/pread.c.  But we can't include
 361  * cache.h there.
 362  */
 363 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 364
 365 #ifdef NO_SETENV
 366 #define setenv gitsetenv
 367 extern int gitsetenv(const char *, const char *, int);
 368 #endif
 369
 370 #ifdef NO_MKDTEMP
 371 #define mkdtemp gitmkdtemp
 372 extern char *gitmkdtemp(char *);
 373 #endif
 374
 375 #ifdef NO_MKSTEMPS
 376 #define mkstemps gitmkstemps
 377 extern int gitmkstemps(char *, int);
 378 #endif
 379
 380 #ifdef NO_UNSETENV
 381 #define unsetenv gitunsetenv
 382 extern void gitunsetenv(const char *);
 383 #endif
 384
 385 #ifdef NO_STRCASESTR
 386 #define strcasestr gitstrcasestr
 387 extern char *gitstrcasestr(const char *haystack, const char *needle);
 388 #endif
 389
 390 #ifdef NO_STRLCPY
 391 #define strlcpy gitstrlcpy
 392 extern size_t gitstrlcpy(char *, const char *, size_t);
 393 #endif
 394
 395 #ifdef NO_STRTOUMAX
 396 #define strtoumax gitstrtoumax
 397 extern uintmax_t gitstrtoumax(const char *, char **, int);
 398 #define strtoimax gitstrtoimax
 399 extern intmax_t gitstrtoimax(const char *, char **, int);
 400 #endif
 401
 402 #ifdef NO_STRTOK_R
 403 #define strtok_r gitstrtok_r
 404 extern char *gitstrtok_r(char *s, const char *delim, char **save_ptr);
 405 #endif
 406
 407 #ifdef NO_HSTRERROR
 408 #define hstrerror githstrerror
 409 extern const char *githstrerror(int herror);
 410 #endif
 411
 412 #ifdef NO_MEMMEM
 413 #define memmem gitmemmem
 414 void *gitmemmem(const void *haystack, size_t haystacklen,
 415                 const void *needle, size_t needlelen);
 416 #endif
 417
 418 #ifdef FREAD_READS_DIRECTORIES
 419 #ifdef fopen
 420 #undef fopen
 421 #endif
 422 #define fopen(a,b) git_fopen(a,b)
 423 extern FILE *git_fopen(const char*, const char*);
 424 #endif
 425
 426 #ifdef SNPRINTF_RETURNS_BOGUS
 427 #define snprintf git_snprintf
 428 extern int git_snprintf(char *str, size_t maxsize,
 429                         const char *format, ...);
 430 #define vsnprintf git_vsnprintf
 431 extern int git_vsnprintf(char *str, size_t maxsize,
 432                          const char *format, va_list ap);
 433 #endif
 434
 435 #ifdef __GLIBC_PREREQ
 436 #if __GLIBC_PREREQ(2, 1)
 437 #define HAVE_STRCHRNUL
 438 #define HAVE_MEMPCPY
 439 #endif
 440 #endif
 441
 442 #ifndef HAVE_STRCHRNUL
 443 #define strchrnul gitstrchrnul
 444 static inline char *gitstrchrnul(const char *s, int c)
 445 {
 446         while (*s && *s != c)
 447                 s++;
 448         return (char *)s;
 449 }
 450 #endif
 451
 452 #ifndef HAVE_MEMPCPY
 453 #define mempcpy gitmempcpy
 454 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 455 {
 456         return (char *)memcpy(dest, src, n) + n;
 457 }
 458 #endif
 459
 460 #ifdef NO_INET_PTON
 461 int inet_pton(int af, const char *src, void *dst);
 462 #endif
 463
 464 #ifdef NO_INET_NTOP
 465 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 466 #endif
 467
 468 extern void release_pack_memory(size_t, int);
 469
 470 typedef void (*try_to_free_t)(size_t);
 471 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 472
 473 extern char *xstrdup(const char *str);
 474 extern void *xmalloc(size_t size);
 475 extern void *xmallocz(size_t size);
 476 extern void *xmemdupz(const void *data, size_t len);
 477 extern char *xstrndup(const char *str, size_t len);
 478 extern void *xrealloc(void *ptr, size_t size);
 479 extern void *xcalloc(size_t nmemb, size_t size);
 480 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 481 extern ssize_t xread(int fd, void *buf, size_t len);
 482 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 483 extern int xdup(int fd);
 484 extern FILE *xfdopen(int fd, const char *mode);
 485 extern int xmkstemp(char *template);
 486 extern int xmkstemp_mode(char *template, int mode);
 487 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 488 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 489
 490 static inline size_t xsize_t(off_t len)
 491 {
 492         if (len > (size_t) len)
 493                 die("Cannot handle files this big");
 494         return (size_t)len;
 495 }
 496
 497 static inline int has_extension(const char *filename, const char *ext)
 498 {
 499         size_t len = strlen(filename);
 500         size_t extlen = strlen(ext);
 501         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 502 }
 503
 504 /* in ctype.c, for kwset users */
 505 extern const char tolower_trans_tbl[256];
 506
 507 /* Sane ctype - no locale, and works with signed chars */
 508 #undef isascii
 509 #undef isspace
 510 #undef isdigit
 511 #undef isalpha
 512 #undef isalnum
 513 #undef islower
 514 #undef isupper
 515 #undef tolower
 516 #undef toupper
 517 extern unsigned char sane_ctype[256];
 518 #define GIT_SPACE 0x01
 519 #define GIT_DIGIT 0x02
 520 #define GIT_ALPHA 0x04
 521 #define GIT_GLOB_SPECIAL 0x08
 522 #define GIT_REGEX_SPECIAL 0x10
 523 #define GIT_PATHSPEC_MAGIC 0x20
 524 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 525 #define isascii(x) (((x) & ~0x7f) == 0)
 526 #define isspace(x) sane_istest(x,GIT_SPACE)
 527 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 528 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 529 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 530 #define islower(x) sane_iscase(x, 1)
 531 #define isupper(x) sane_iscase(x, 0)
 532 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 533 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 534 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 535 #define toupper(x) sane_case((unsigned char)(x), 0)
 536 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 537
 538 static inline int sane_case(int x, int high)
 539 {
 540         if (sane_istest(x, GIT_ALPHA))
 541                 x = (x & ~0x20) | high;
 542         return x;
 543 }
 544
 545 static inline int sane_iscase(int x, int is_lower)
 546 {
 547         if (!sane_istest(x, GIT_ALPHA))
 548                 return 0;
 549
 550         if (is_lower)
 551                 return (x & 0x20) != 0;
 552         else
 553                 return (x & 0x20) == 0;
 554 }
 555
 556 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 557 {
 558         unsigned long ul;
 559         char *p;
 560
 561         errno = 0;
 562         ul = strtoul(s, &p, base);
 563         if (errno || *p || p == s || (unsigned int) ul != ul)
 564                 return -1;
 565         *result = ul;
 566         return 0;
 567 }
 568
 569 static inline int strtol_i(char const *s, int base, int *result)
 570 {
 571         long ul;
 572         char *p;
 573
 574         errno = 0;
 575         ul = strtol(s, &p, base);
 576         if (errno || *p || p == s || (int) ul != ul)
 577                 return -1;
 578         *result = ul;
 579         return 0;
 580 }
 581
 582 #ifdef INTERNAL_QSORT
 583 void git_qsort(void *base, size_t nmemb, size_t size,
 584                int(*compar)(const void *, const void *));
 585 #define qsort git_qsort
 586 #endif
 587
 588 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 589 # define FORCE_DIR_SET_GID S_ISGID
 590 #else
 591 # define FORCE_DIR_SET_GID 0
 592 #endif
 593
 594 #ifdef NO_NSEC
 595 #undef USE_NSEC
 596 #define ST_CTIME_NSEC(st) 0
 597 #define ST_MTIME_NSEC(st) 0
 598 #else
 599 #ifdef USE_ST_TIMESPEC
 600 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 601 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 602 #else
 603 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 604 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 605 #endif
 606 #endif
 607
 608 #ifdef UNRELIABLE_FSTAT
 609 #define fstat_is_reliable() 0
 610 #else
 611 #define fstat_is_reliable() 1
 612 #endif
 613
 614 #ifndef va_copy
 615 /*
 616  * Since an obvious implementation of va_list would be to make it a
 617  * pointer into the stack frame, a simple assignment will work on
 618  * many systems.  But let's try to be more portable.
 619  */
 620 #ifdef __va_copy
 621 #define va_copy(dst, src) __va_copy(dst, src)
 622 #else
 623 #define va_copy(dst, src) ((dst) = (src))
 624 #endif
 625 #endif
 626
 627 /*
 628  * Preserves errno, prints a message, but gives no warning for ENOENT.
 629  * Always returns the return value of unlink(2).
 630  */
 631 int unlink_or_warn(const char *path);
 632 /*
 633  * Likewise for rmdir(2).
 634  */
 635 int rmdir_or_warn(const char *path);
 636 /*
 637  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 638  * the supplied file mode.
 639  */
 640 int remove_or_warn(unsigned int mode, const char *path);
 641
 642 /* Call access(2), but warn for any error besides ENOENT. */
 643 int access_or_warn(const char *path, int mode);
 644
 645 /* Warn on an inaccessible file that ought to be accessible */
 646 void warn_on_inaccessible(const char *path);
 647
 648 /* Get the passwd entry for the UID of the current process. */
 649 struct passwd *xgetpwuid_self(void);
 650
 651 #ifndef mark_as_git_dir
 652 #define mark_as_git_dir(x) /* noop */
 653 #endif
 654
 655 #ifndef get_home_directory
 656 #define get_home_directory() getenv("HOME")
 657 #endif
 658
 659 #endif