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