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) && !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 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  89 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  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 #define GIT_WINDOWS_NATIVE
  96 #endif
  97
  98 #include <unistd.h>
  99 #include <stdio.h>
 100 #include <sys/stat.h>
 101 #include <fcntl.h>
 102 #include <stddef.h>
 103 #include <stdlib.h>
 104 #include <stdarg.h>
 105 #include <string.h>
 106 #ifdef HAVE_STRINGS_H
 107 #include <strings.h> /* for strcasecmp() */
 108 #endif
 109 #include <errno.h>
 110 #include <limits.h>
 111 #ifdef NEEDS_SYS_PARAM_H
 112 #include <sys/param.h>
 113 #endif
 114 #include <sys/types.h>
 115 #include <dirent.h>
 116 #include <sys/time.h>
 117 #include <time.h>
 118 #include <signal.h>
 119 #ifndef USE_WILDMATCH
 120 #include <fnmatch.h>
 121 #endif
 122 #include <assert.h>
 123 #include <regex.h>
 124 #include <utime.h>
 125 #include <syslog.h>
 126 #ifndef NO_SYS_POLL_H
 127 #include <sys/poll.h>
 128 #else
 129 #include <poll.h>
 130 #endif
 131
 132 #if defined(__MINGW32__)
 133 /* pull in Windows compatibility stuff */
 134 #include "compat/mingw.h"
 135 #elif defined(_MSC_VER)
 136 #include "compat/msvc.h"
 137 #else
 138 #include <sys/wait.h>
 139 #include <sys/resource.h>
 140 #include <sys/socket.h>
 141 #include <sys/ioctl.h>
 142 #include <termios.h>
 143 #ifndef NO_SYS_SELECT_H
 144 #include <sys/select.h>
 145 #endif
 146 #include <netinet/in.h>
 147 #include <netinet/tcp.h>
 148 #include <arpa/inet.h>
 149 #include <netdb.h>
 150 #include <pwd.h>
 151 #include <sys/un.h>
 152 #ifndef NO_INTTYPES_H
 153 #include <inttypes.h>
 154 #else
 155 #include <stdint.h>
 156 #endif
 157 #ifdef NO_INTPTR_T
 158 /*
 159  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 160  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 161  * while on IP16 and IP16L32 it is "int" (resp. "short")
 162  * Size needs to match (or exceed) 'sizeof(void *)'.
 163  * We can't take "long long" here as not everybody has it.
 164  */
 165 typedef long intptr_t;
 166 typedef unsigned long uintptr_t;
 167 #endif
 168 #if defined(__CYGWIN__)
 169 #undef _XOPEN_SOURCE
 170 #include <grp.h>
 171 #define _XOPEN_SOURCE 600
 172 #else
 173 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 174 #include <grp.h>
 175 #define _ALL_SOURCE 1
 176 #endif
 177 #endif
 178
 179 /* used on Mac OS X */
 180 #ifdef PRECOMPOSE_UNICODE
 181 #include "compat/precompose_utf8.h"
 182 #else
 183 #define precompose_str(in,i_nfd2nfc)
 184 #define precompose_argv(c,v)
 185 #define probe_utf8_pathname_composition(a,b)
 186 #endif
 187
 188 #ifdef MKDIR_WO_TRAILING_SLASH
 189 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 190 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 191 #endif
 192
 193 #ifdef NO_STRUCT_ITIMERVAL
 194 struct itimerval {
 195         struct timeval it_interval;
 196         struct timeval it_value;
 197 }
 198 #endif
 199
 200 #ifdef NO_SETITIMER
 201 #define setitimer(which,value,ovalue)
 202 #endif
 203
 204 #ifndef NO_LIBGEN_H
 205 #include <libgen.h>
 206 #else
 207 #define basename gitbasename
 208 extern char *gitbasename(char *);
 209 #endif
 210
 211 #ifndef NO_ICONV
 212 #include <iconv.h>
 213 #endif
 214
 215 #ifndef NO_OPENSSL
 216 #include <openssl/ssl.h>
 217 #include <openssl/err.h>
 218 #endif
 219
 220 /* On most systems <netdb.h> would have given us this, but
 221  * not on some systems (e.g. z/OS).
 222  */
 223 #ifndef NI_MAXHOST
 224 #define NI_MAXHOST 1025
 225 #endif
 226
 227 #ifndef NI_MAXSERV
 228 #define NI_MAXSERV 32
 229 #endif
 230
 231 /* On most systems <limits.h> would have given us this, but
 232  * not on some systems (e.g. GNU/Hurd).
 233  */
 234 #ifndef PATH_MAX
 235 #define PATH_MAX 4096
 236 #endif
 237
 238 #ifndef PRIuMAX
 239 #define PRIuMAX "llu"
 240 #endif
 241
 242 #ifndef PRIu32
 243 #define PRIu32 "u"
 244 #endif
 245
 246 #ifndef PRIx32
 247 #define PRIx32 "x"
 248 #endif
 249
 250 #ifndef PRIo32
 251 #define PRIo32 "o"
 252 #endif
 253
 254 #ifndef PATH_SEP
 255 #define PATH_SEP ':'
 256 #endif
 257
 258 #ifdef HAVE_PATHS_H
 259 #include <paths.h>
 260 #endif
 261 #ifndef _PATH_DEFPATH
 262 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 263 #endif
 264
 265 #ifndef STRIP_EXTENSION
 266 #define STRIP_EXTENSION ""
 267 #endif
 268
 269 #ifndef has_dos_drive_prefix
 270 #define has_dos_drive_prefix(path) 0
 271 #endif
 272
 273 #ifndef offset_1st_component
 274 #define offset_1st_component(path) (is_dir_sep((path)[0]))
 275 #endif
 276
 277 #ifndef is_dir_sep
 278 #define is_dir_sep(c) ((c) == '/')
 279 #endif
 280
 281 #ifndef find_last_dir_sep
 282 #define find_last_dir_sep(path) strrchr(path, '/')
 283 #endif
 284
 285 #if defined(__HP_cc) && (__HP_cc >= 61000)
 286 #define NORETURN __attribute__((noreturn))
 287 #define NORETURN_PTR
 288 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 289 #define NORETURN __attribute__((__noreturn__))
 290 #define NORETURN_PTR __attribute__((__noreturn__))
 291 #elif defined(_MSC_VER)
 292 #define NORETURN __declspec(noreturn)
 293 #define NORETURN_PTR
 294 #else
 295 #define NORETURN
 296 #define NORETURN_PTR
 297 #ifndef __attribute__
 298 #define __attribute__(x)
 299 #endif
 300 #endif
 301
 302 /* The sentinel attribute is valid from gcc version 4.0 */
 303 #if defined(__GNUC__) && (__GNUC__ >= 4)
 304 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 305 #else
 306 #define LAST_ARG_MUST_BE_NULL
 307 #endif
 308
 309 #include "compat/bswap.h"
 310
 311 #ifdef USE_WILDMATCH
 312 #include "wildmatch.h"
 313 #define FNM_PATHNAME WM_PATHNAME
 314 #define FNM_CASEFOLD WM_CASEFOLD
 315 #define FNM_NOMATCH  WM_NOMATCH
 316 static inline int fnmatch(const char *pattern, const char *string, int flags)
 317 {
 318         return wildmatch(pattern, string, flags, NULL);
 319 }
 320 #endif
 321
 322 /* General helper functions */
 323 extern void vreportf(const char *prefix, const char *err, va_list params);
 324 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 325 extern NORETURN void usage(const char *err);
 326 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 327 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 328 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 329 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 330 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 331
 332 #ifndef NO_OPENSSL
 333 #ifdef APPLE_COMMON_CRYPTO
 334 #include "compat/apple-common-crypto.h"
 335 #else
 336 #include <openssl/evp.h>
 337 #include <openssl/hmac.h>
 338 #endif /* APPLE_COMMON_CRYPTO */
 339 #include <openssl/x509v3.h>
 340 #endif /* NO_OPENSSL */
 341
 342 /*
 343  * Let callers be aware of the constant return value; this can help
 344  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 345  * because some compilers may not support variadic macros. Since we're only
 346  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 347  * using the function as usual.
 348  */
 349 #if defined(__GNUC__) && ! defined(__clang__)
 350 #define error(...) (error(__VA_ARGS__), -1)
 351 #endif
 352
 353 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 354 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 355 extern void set_die_is_recursing_routine(int (*routine)(void));
 356
 357 extern int prefixcmp(const char *str, const char *prefix);
 358 extern int suffixcmp(const char *str, const char *suffix);
 359
 360 static inline const char *skip_prefix(const char *str, const char *prefix)
 361 {
 362         size_t len = strlen(prefix);
 363         return strncmp(str, prefix, len) ? NULL : str + len;
 364 }
 365
 366 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 367
 368 #ifndef PROT_READ
 369 #define PROT_READ 1
 370 #define PROT_WRITE 2
 371 #define MAP_PRIVATE 1
 372 #endif
 373
 374 #define mmap git_mmap
 375 #define munmap git_munmap
 376 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 377 extern int git_munmap(void *start, size_t length);
 378
 379 #else /* NO_MMAP || USE_WIN32_MMAP */
 380
 381 #include <sys/mman.h>
 382
 383 #endif /* NO_MMAP || USE_WIN32_MMAP */
 384
 385 #ifdef NO_MMAP
 386
 387 /* This value must be multiple of (pagesize * 2) */
 388 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 389
 390 #else /* NO_MMAP */
 391
 392 /* This value must be multiple of (pagesize * 2) */
 393 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 394         (sizeof(void*) >= 8 \
 395                 ?  1 * 1024 * 1024 * 1024 \
 396                 : 32 * 1024 * 1024)
 397
 398 #endif /* NO_MMAP */
 399
 400 #ifndef MAP_FAILED
 401 #define MAP_FAILED ((void *)-1)
 402 #endif
 403
 404 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 405 #define on_disk_bytes(st) ((st).st_size)
 406 #else
 407 #define on_disk_bytes(st) ((st).st_blocks * 512)
 408 #endif
 409
 410 #define DEFAULT_PACKED_GIT_LIMIT \
 411         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 412
 413 #ifdef NO_PREAD
 414 #define pread git_pread
 415 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 416 #endif
 417 /*
 418  * Forward decl that will remind us if its twin in cache.h changes.
 419  * This function is used in compat/pread.c.  But we can't include
 420  * cache.h there.
 421  */
 422 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 423
 424 #ifdef NO_SETENV
 425 #define setenv gitsetenv
 426 extern int gitsetenv(const char *, const char *, int);
 427 #endif
 428
 429 #ifdef NO_MKDTEMP
 430 #define mkdtemp gitmkdtemp
 431 extern char *gitmkdtemp(char *);
 432 #endif
 433
 434 #ifdef NO_MKSTEMPS
 435 #define mkstemps gitmkstemps
 436 extern int gitmkstemps(char *, int);
 437 #endif
 438
 439 #ifdef NO_UNSETENV
 440 #define unsetenv gitunsetenv
 441 extern void gitunsetenv(const char *);
 442 #endif
 443
 444 #ifdef NO_STRCASESTR
 445 #define strcasestr gitstrcasestr
 446 extern char *gitstrcasestr(const char *haystack, const char *needle);
 447 #endif
 448
 449 #ifdef NO_STRLCPY
 450 #define strlcpy gitstrlcpy
 451 extern size_t gitstrlcpy(char *, const char *, size_t);
 452 #endif
 453
 454 #ifdef NO_STRTOUMAX
 455 #define strtoumax gitstrtoumax
 456 extern uintmax_t gitstrtoumax(const char *, char **, int);
 457 #define strtoimax gitstrtoimax
 458 extern intmax_t gitstrtoimax(const char *, char **, int);
 459 #endif
 460
 461 #ifdef NO_HSTRERROR
 462 #define hstrerror githstrerror
 463 extern const char *githstrerror(int herror);
 464 #endif
 465
 466 #ifdef NO_MEMMEM
 467 #define memmem gitmemmem
 468 void *gitmemmem(const void *haystack, size_t haystacklen,
 469                 const void *needle, size_t needlelen);
 470 #endif
 471
 472 #ifdef NO_GETPAGESIZE
 473 #define getpagesize() sysconf(_SC_PAGESIZE)
 474 #endif
 475
 476 #ifdef FREAD_READS_DIRECTORIES
 477 #ifdef fopen
 478 #undef fopen
 479 #endif
 480 #define fopen(a,b) git_fopen(a,b)
 481 extern FILE *git_fopen(const char*, const char*);
 482 #endif
 483
 484 #ifdef SNPRINTF_RETURNS_BOGUS
 485 #define snprintf git_snprintf
 486 extern int git_snprintf(char *str, size_t maxsize,
 487                         const char *format, ...);
 488 #define vsnprintf git_vsnprintf
 489 extern int git_vsnprintf(char *str, size_t maxsize,
 490                          const char *format, va_list ap);
 491 #endif
 492
 493 #ifdef __GLIBC_PREREQ
 494 #if __GLIBC_PREREQ(2, 1)
 495 #define HAVE_STRCHRNUL
 496 #define HAVE_MEMPCPY
 497 #endif
 498 #endif
 499
 500 #ifndef HAVE_STRCHRNUL
 501 #define strchrnul gitstrchrnul
 502 static inline char *gitstrchrnul(const char *s, int c)
 503 {
 504         while (*s && *s != c)
 505                 s++;
 506         return (char *)s;
 507 }
 508 #endif
 509
 510 #ifndef HAVE_MEMPCPY
 511 #define mempcpy gitmempcpy
 512 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 513 {
 514         return (char *)memcpy(dest, src, n) + n;
 515 }
 516 #endif
 517
 518 #ifdef NO_INET_PTON
 519 int inet_pton(int af, const char *src, void *dst);
 520 #endif
 521
 522 #ifdef NO_INET_NTOP
 523 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 524 #endif
 525
 526 extern void release_pack_memory(size_t);
 527
 528 typedef void (*try_to_free_t)(size_t);
 529 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 530
 531 extern char *xstrdup(const char *str);
 532 extern void *xmalloc(size_t size);
 533 extern void *xmallocz(size_t size);
 534 extern void *xmemdupz(const void *data, size_t len);
 535 extern char *xstrndup(const char *str, size_t len);
 536 extern void *xrealloc(void *ptr, size_t size);
 537 extern void *xcalloc(size_t nmemb, size_t size);
 538 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 539 extern ssize_t xread(int fd, void *buf, size_t len);
 540 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 541 extern int xdup(int fd);
 542 extern FILE *xfdopen(int fd, const char *mode);
 543 extern int xmkstemp(char *template);
 544 extern int xmkstemp_mode(char *template, int mode);
 545 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 546 extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 547
 548 static inline size_t xsize_t(off_t len)
 549 {
 550         if (len > (size_t) len)
 551                 die("Cannot handle files this big");
 552         return (size_t)len;
 553 }
 554
 555 static inline int has_extension(const char *filename, const char *ext)
 556 {
 557         size_t len = strlen(filename);
 558         size_t extlen = strlen(ext);
 559         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 560 }
 561
 562 /* in ctype.c, for kwset users */
 563 extern const char tolower_trans_tbl[256];
 564
 565 /* Sane ctype - no locale, and works with signed chars */
 566 #undef isascii
 567 #undef isspace
 568 #undef isdigit
 569 #undef isalpha
 570 #undef isalnum
 571 #undef isprint
 572 #undef islower
 573 #undef isupper
 574 #undef tolower
 575 #undef toupper
 576 #undef iscntrl
 577 #undef ispunct
 578 #undef isxdigit
 579
 580 extern const unsigned char sane_ctype[256];
 581 #define GIT_SPACE 0x01
 582 #define GIT_DIGIT 0x02
 583 #define GIT_ALPHA 0x04
 584 #define GIT_GLOB_SPECIAL 0x08
 585 #define GIT_REGEX_SPECIAL 0x10
 586 #define GIT_PATHSPEC_MAGIC 0x20
 587 #define GIT_CNTRL 0x40
 588 #define GIT_PUNCT 0x80
 589 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 590 #define isascii(x) (((x) & ~0x7f) == 0)
 591 #define isspace(x) sane_istest(x,GIT_SPACE)
 592 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 593 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 594 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 595 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 596 #define islower(x) sane_iscase(x, 1)
 597 #define isupper(x) sane_iscase(x, 0)
 598 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 599 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 600 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 601 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 602                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 603 #define isxdigit(x) (hexval_table[x] != -1)
 604 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 605 #define toupper(x) sane_case((unsigned char)(x), 0)
 606 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 607
 608 static inline int sane_case(int x, int high)
 609 {
 610         if (sane_istest(x, GIT_ALPHA))
 611                 x = (x & ~0x20) | high;
 612         return x;
 613 }
 614
 615 static inline int sane_iscase(int x, int is_lower)
 616 {
 617         if (!sane_istest(x, GIT_ALPHA))
 618                 return 0;
 619
 620         if (is_lower)
 621                 return (x & 0x20) != 0;
 622         else
 623                 return (x & 0x20) == 0;
 624 }
 625
 626 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 627 {
 628         unsigned long ul;
 629         char *p;
 630
 631         errno = 0;
 632         ul = strtoul(s, &p, base);
 633         if (errno || *p || p == s || (unsigned int) ul != ul)
 634                 return -1;
 635         *result = ul;
 636         return 0;
 637 }
 638
 639 static inline int strtol_i(char const *s, int base, int *result)
 640 {
 641         long ul;
 642         char *p;
 643
 644         errno = 0;
 645         ul = strtol(s, &p, base);
 646         if (errno || *p || p == s || (int) ul != ul)
 647                 return -1;
 648         *result = ul;
 649         return 0;
 650 }
 651
 652 #ifdef INTERNAL_QSORT
 653 void git_qsort(void *base, size_t nmemb, size_t size,
 654                int(*compar)(const void *, const void *));
 655 #define qsort git_qsort
 656 #endif
 657
 658 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 659 # define FORCE_DIR_SET_GID S_ISGID
 660 #else
 661 # define FORCE_DIR_SET_GID 0
 662 #endif
 663
 664 #ifdef NO_NSEC
 665 #undef USE_NSEC
 666 #define ST_CTIME_NSEC(st) 0
 667 #define ST_MTIME_NSEC(st) 0
 668 #else
 669 #ifdef USE_ST_TIMESPEC
 670 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 671 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 672 #else
 673 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 674 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 675 #endif
 676 #endif
 677
 678 #ifdef UNRELIABLE_FSTAT
 679 #define fstat_is_reliable() 0
 680 #else
 681 #define fstat_is_reliable() 1
 682 #endif
 683
 684 #ifndef va_copy
 685 /*
 686  * Since an obvious implementation of va_list would be to make it a
 687  * pointer into the stack frame, a simple assignment will work on
 688  * many systems.  But let's try to be more portable.
 689  */
 690 #ifdef __va_copy
 691 #define va_copy(dst, src) __va_copy(dst, src)
 692 #else
 693 #define va_copy(dst, src) ((dst) = (src))
 694 #endif
 695 #endif
 696
 697 /*
 698  * Preserves errno, prints a message, but gives no warning for ENOENT.
 699  * Always returns the return value of unlink(2).
 700  */
 701 int unlink_or_warn(const char *path);
 702 /*
 703  * Likewise for rmdir(2).
 704  */
 705 int rmdir_or_warn(const char *path);
 706 /*
 707  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 708  * the supplied file mode.
 709  */
 710 int remove_or_warn(unsigned int mode, const char *path);
 711
 712 /*
 713  * Call access(2), but warn for any error except "missing file"
 714  * (ENOENT or ENOTDIR).
 715  */
 716 #define ACCESS_EACCES_OK (1U << 0)
 717 int access_or_warn(const char *path, int mode, unsigned flag);
 718 int access_or_die(const char *path, int mode, unsigned flag);
 719
 720 /* Warn on an inaccessible file that ought to be accessible */
 721 void warn_on_inaccessible(const char *path);
 722
 723 /* Get the passwd entry for the UID of the current process. */
 724 struct passwd *xgetpwuid_self(void);
 725
 726 #ifndef mark_as_git_dir
 727 #define mark_as_git_dir(x) /* noop */
 728 #endif
 729
 730 #ifndef get_home_directory
 731 #define get_home_directory() getenv("HOME")
 732 #endif
 733
 734 #endif