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 #include "compat/win32/fscache.h"
 133 #elif defined(_MSC_VER)
 134 #include "compat/msvc.h"
 135 #include "compat/win32/fscache.h"
 136 #else
 137 #include <sys/wait.h>
 138 #include <sys/resource.h>
 139 #include <sys/socket.h>
 140 #include <sys/ioctl.h>
 141 #include <termios.h>
 142 #ifndef NO_SYS_SELECT_H
 143 #include <sys/select.h>
 144 #endif
 145 #include <netinet/in.h>
 146 #include <netinet/tcp.h>
 147 #include <arpa/inet.h>
 148 #include <netdb.h>
 149 #include <pwd.h>
 150 #include <sys/un.h>
 151 #ifndef NO_INTTYPES_H
 152 #include <inttypes.h>
 153 #else
 154 #include <stdint.h>
 155 #endif
 156 #ifdef NO_INTPTR_T
 157 /*
 158  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 159  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 160  * while on IP16 and IP16L32 it is "int" (resp. "short")
 161  * Size needs to match (or exceed) 'sizeof(void *)'.
 162  * We can't take "long long" here as not everybody has it.
 163  */
 164 typedef long intptr_t;
 165 typedef unsigned long uintptr_t;
 166 #endif
 167 #if defined(__CYGWIN__)
 168 #undef _XOPEN_SOURCE
 169 #include <grp.h>
 170 #define _XOPEN_SOURCE 600
 171 #else
 172 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 173 #include <grp.h>
 174 #define _ALL_SOURCE 1
 175 #endif
 176 #endif
 177
 178 /* used on Mac OS X */
 179 #ifdef PRECOMPOSE_UNICODE
 180 #include "compat/precompose_utf8.h"
 181 #else
 182 #define precompose_str(in,i_nfd2nfc)
 183 #define precompose_argv(c,v)
 184 #define probe_utf8_pathname_composition(a,b)
 185 #endif
 186
 187 #ifdef MKDIR_WO_TRAILING_SLASH
 188 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 189 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 190 #endif
 191
 192 #ifdef NO_STRUCT_ITIMERVAL
 193 struct itimerval {
 194         struct timeval it_interval;
 195         struct timeval it_value;
 196 }
 197 #endif
 198
 199 #ifdef NO_SETITIMER
 200 #define setitimer(which,value,ovalue)
 201 #endif
 202
 203 #ifndef NO_LIBGEN_H
 204 #include <libgen.h>
 205 #else
 206 #define basename gitbasename
 207 extern char *gitbasename(char *);
 208 #endif
 209
 210 #ifndef NO_ICONV
 211 #include <iconv.h>
 212 #endif
 213
 214 #ifndef NO_OPENSSL
 215 #include <openssl/ssl.h>
 216 #include <openssl/err.h>
 217 #endif
 218
 219 /* On most systems <netdb.h> would have given us this, but
 220  * not on some systems (e.g. z/OS).
 221  */
 222 #ifndef NI_MAXHOST
 223 #define NI_MAXHOST 1025
 224 #endif
 225
 226 #ifndef NI_MAXSERV
 227 #define NI_MAXSERV 32
 228 #endif
 229
 230 /* On most systems <limits.h> would have given us this, but
 231  * not on some systems (e.g. GNU/Hurd).
 232  */
 233 #ifndef PATH_MAX
 234 #define PATH_MAX 4096
 235 #endif
 236
 237 #ifndef PRIuMAX
 238 #define PRIuMAX "llu"
 239 #endif
 240
 241 #ifndef PRIu32
 242 #define PRIu32 "u"
 243 #endif
 244
 245 #ifndef PRIx32
 246 #define PRIx32 "x"
 247 #endif
 248
 249 #ifndef PRIo32
 250 #define PRIo32 "o"
 251 #endif
 252
 253 #ifndef PATH_SEP
 254 #define PATH_SEP ':'
 255 #endif
 256
 257 #ifdef HAVE_PATHS_H
 258 #include <paths.h>
 259 #endif
 260 #ifndef _PATH_DEFPATH
 261 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 262 #endif
 263
 264 #ifndef STRIP_EXTENSION
 265 #define STRIP_EXTENSION ""
 266 #endif
 267
 268 #ifndef has_dos_drive_prefix
 269 #define has_dos_drive_prefix(path) 0
 270 #endif
 271
 272 #ifndef is_dir_sep
 273 #define is_dir_sep(c) ((c) == '/')
 274 #endif
 275
 276 #ifndef find_last_dir_sep
 277 #define find_last_dir_sep(path) strrchr(path, '/')
 278 #endif
 279
 280 #if defined(__HP_cc) && (__HP_cc >= 61000)
 281 #define NORETURN __attribute__((noreturn))
 282 #define NORETURN_PTR
 283 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 284 #define NORETURN __attribute__((__noreturn__))
 285 #define NORETURN_PTR __attribute__((__noreturn__))
 286 #elif defined(_MSC_VER)
 287 #define NORETURN __declspec(noreturn)
 288 #define NORETURN_PTR
 289 #else
 290 #define NORETURN
 291 #define NORETURN_PTR
 292 #ifndef __attribute__
 293 #define __attribute__(x)
 294 #endif
 295 #endif
 296
 297 /* The sentinel attribute is valid from gcc version 4.0 */
 298 #if defined(__GNUC__) && (__GNUC__ >= 4)
 299 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 300 #else
 301 #define LAST_ARG_MUST_BE_NULL
 302 #endif
 303
 304 #include "compat/bswap.h"
 305
 306 #include "wildmatch.h"
 307
 308 /* General helper functions */
 309 extern void vreportf(const char *prefix, const char *err, va_list params);
 310 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 311 extern NORETURN void usage(const char *err);
 312 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 313 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 314 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 315 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 316 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 317
 318 #ifndef NO_OPENSSL
 319 #ifdef APPLE_COMMON_CRYPTO
 320 #include "compat/apple-common-crypto.h"
 321 #else
 322 #include <openssl/evp.h>
 323 #include <openssl/hmac.h>
 324 #endif /* APPLE_COMMON_CRYPTO */
 325 #include <openssl/x509v3.h>
 326 #endif /* NO_OPENSSL */
 327
 328 /*
 329  * Let callers be aware of the constant return value; this can help
 330  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 331  * because some compilers may not support variadic macros. Since we're only
 332  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 333  * using the function as usual.
 334  */
 335 #if defined(__GNUC__) && ! defined(__clang__)
 336 #define error(...) (error(__VA_ARGS__), -1)
 337 #endif
 338
 339 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 340 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 341 extern void set_die_is_recursing_routine(int (*routine)(void));
 342
 343 extern int starts_with(const char *str, const char *prefix);
 344 extern int ends_with(const char *str, const char *suffix);
 345
 346 static inline const char *skip_prefix(const char *str, const char *prefix)
 347 {
 348         do {
 349                 if (!*prefix)
 350                         return str;
 351         } while (*str++ == *prefix++);
 352         return NULL;
 353 }
 354
 355 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 356
 357 #ifndef PROT_READ
 358 #define PROT_READ 1
 359 #define PROT_WRITE 2
 360 #define MAP_PRIVATE 1
 361 #endif
 362
 363 #define mmap git_mmap
 364 #define munmap git_munmap
 365 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 366 extern int git_munmap(void *start, size_t length);
 367
 368 #else /* NO_MMAP || USE_WIN32_MMAP */
 369
 370 #include <sys/mman.h>
 371
 372 #endif /* NO_MMAP || USE_WIN32_MMAP */
 373
 374 #ifdef NO_MMAP
 375
 376 /* This value must be multiple of (pagesize * 2) */
 377 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 378
 379 #else /* NO_MMAP */
 380
 381 /* This value must be multiple of (pagesize * 2) */
 382 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 383         (sizeof(void*) >= 8 \
 384                 ?  1 * 1024 * 1024 * 1024 \
 385                 : 32 * 1024 * 1024)
 386
 387 #endif /* NO_MMAP */
 388
 389 #ifndef MAP_FAILED
 390 #define MAP_FAILED ((void *)-1)
 391 #endif
 392
 393 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 394 #define on_disk_bytes(st) ((st).st_size)
 395 #else
 396 #define on_disk_bytes(st) ((st).st_blocks * 512)
 397 #endif
 398
 399 #define DEFAULT_PACKED_GIT_LIMIT \
 400         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 401
 402 #ifdef NO_PREAD
 403 #define pread git_pread
 404 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 405 #endif
 406 /*
 407  * Forward decl that will remind us if its twin in cache.h changes.
 408  * This function is used in compat/pread.c.  But we can't include
 409  * cache.h there.
 410  */
 411 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 412
 413 #ifdef NO_SETENV
 414 #define setenv gitsetenv
 415 extern int gitsetenv(const char *, const char *, int);
 416 #endif
 417
 418 #ifdef NO_MKDTEMP
 419 #define mkdtemp gitmkdtemp
 420 extern char *gitmkdtemp(char *);
 421 #endif
 422
 423 #ifdef NO_MKSTEMPS
 424 #define mkstemps gitmkstemps
 425 extern int gitmkstemps(char *, int);
 426 #endif
 427
 428 #ifdef NO_UNSETENV
 429 #define unsetenv gitunsetenv
 430 extern void gitunsetenv(const char *);
 431 #endif
 432
 433 #ifdef NO_STRCASESTR
 434 #define strcasestr gitstrcasestr
 435 extern char *gitstrcasestr(const char *haystack, const char *needle);
 436 #endif
 437
 438 #ifdef NO_STRLCPY
 439 #define strlcpy gitstrlcpy
 440 extern size_t gitstrlcpy(char *, const char *, size_t);
 441 #endif
 442
 443 #ifdef NO_STRTOUMAX
 444 #define strtoumax gitstrtoumax
 445 extern uintmax_t gitstrtoumax(const char *, char **, int);
 446 #define strtoimax gitstrtoimax
 447 extern intmax_t gitstrtoimax(const char *, char **, int);
 448 #endif
 449
 450 #ifdef NO_HSTRERROR
 451 #define hstrerror githstrerror
 452 extern const char *githstrerror(int herror);
 453 #endif
 454
 455 #ifdef NO_MEMMEM
 456 #define memmem gitmemmem
 457 void *gitmemmem(const void *haystack, size_t haystacklen,
 458                 const void *needle, size_t needlelen);
 459 #endif
 460
 461 #ifdef NO_GETPAGESIZE
 462 #define getpagesize() sysconf(_SC_PAGESIZE)
 463 #endif
 464
 465 #ifdef FREAD_READS_DIRECTORIES
 466 #ifdef fopen
 467 #undef fopen
 468 #endif
 469 #define fopen(a,b) git_fopen(a,b)
 470 extern FILE *git_fopen(const char*, const char*);
 471 #endif
 472
 473 #ifdef SNPRINTF_RETURNS_BOGUS
 474 #ifdef snprintf
 475 #undef snprintf
 476 #endif
 477 #define snprintf git_snprintf
 478 extern int git_snprintf(char *str, size_t maxsize,
 479                         const char *format, ...);
 480 #ifdef vsnprintf
 481 #undef vsnprintf
 482 #endif
 483 #define vsnprintf git_vsnprintf
 484 extern int git_vsnprintf(char *str, size_t maxsize,
 485                          const char *format, va_list ap);
 486 #endif
 487
 488 #ifdef __GLIBC_PREREQ
 489 #if __GLIBC_PREREQ(2, 1)
 490 #define HAVE_STRCHRNUL
 491 #define HAVE_MEMPCPY
 492 #endif
 493 #endif
 494
 495 #ifndef HAVE_STRCHRNUL
 496 #define strchrnul gitstrchrnul
 497 static inline char *gitstrchrnul(const char *s, int c)
 498 {
 499         while (*s && *s != c)
 500                 s++;
 501         return (char *)s;
 502 }
 503 #endif
 504
 505 #ifndef HAVE_MEMPCPY
 506 #define mempcpy gitmempcpy
 507 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 508 {
 509         return (char *)memcpy(dest, src, n) + n;
 510 }
 511 #endif
 512
 513 #ifdef NO_INET_PTON
 514 int inet_pton(int af, const char *src, void *dst);
 515 #endif
 516
 517 #ifdef NO_INET_NTOP
 518 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 519 #endif
 520
 521 extern void release_pack_memory(size_t);
 522
 523 typedef void (*try_to_free_t)(size_t);
 524 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 525
 526 extern char *xstrdup(const char *str);
 527 extern void *xmalloc(size_t size);
 528 extern void *xmallocz(size_t size);
 529 extern void *xmemdupz(const void *data, size_t len);
 530 extern char *xstrndup(const char *str, size_t len);
 531 extern void *xrealloc(void *ptr, size_t size);
 532 extern void *xcalloc(size_t nmemb, size_t size);
 533 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 534 extern ssize_t xread(int fd, void *buf, size_t len);
 535 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 536 extern int xdup(int fd);
 537 extern FILE *xfdopen(int fd, const char *mode);
 538 extern int xmkstemp(char *template);
 539 extern int xmkstemp_mode(char *template, int mode);
 540 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 541 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 542
 543 static inline size_t xsize_t(off_t len)
 544 {
 545         if (len > (size_t) len)
 546                 die("Cannot handle files this big");
 547         return (size_t)len;
 548 }
 549
 550 static inline int has_extension(const char *filename, const char *ext)
 551 {
 552         size_t len = strlen(filename);
 553         size_t extlen = strlen(ext);
 554         return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 555 }
 556
 557 /* in ctype.c, for kwset users */
 558 extern const char tolower_trans_tbl[256];
 559
 560 /* Sane ctype - no locale, and works with signed chars */
 561 #undef isascii
 562 #undef isspace
 563 #undef isdigit
 564 #undef isalpha
 565 #undef isalnum
 566 #undef isprint
 567 #undef islower
 568 #undef isupper
 569 #undef tolower
 570 #undef toupper
 571 #undef iscntrl
 572 #undef ispunct
 573 #undef isxdigit
 574
 575 extern const unsigned char sane_ctype[256];
 576 #define GIT_SPACE 0x01
 577 #define GIT_DIGIT 0x02
 578 #define GIT_ALPHA 0x04
 579 #define GIT_GLOB_SPECIAL 0x08
 580 #define GIT_REGEX_SPECIAL 0x10
 581 #define GIT_PATHSPEC_MAGIC 0x20
 582 #define GIT_CNTRL 0x40
 583 #define GIT_PUNCT 0x80
 584 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 585 #define isascii(x) (((x) & ~0x7f) == 0)
 586 #define isspace(x) sane_istest(x,GIT_SPACE)
 587 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 588 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 589 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 590 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 591 #define islower(x) sane_iscase(x, 1)
 592 #define isupper(x) sane_iscase(x, 0)
 593 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 594 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 595 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 596 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 597                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 598 #define isxdigit(x) (hexval_table[x] != -1)
 599 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 600 #define toupper(x) sane_case((unsigned char)(x), 0)
 601 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 602
 603 static inline int sane_case(int x, int high)
 604 {
 605         if (sane_istest(x, GIT_ALPHA))
 606                 x = (x & ~0x20) | high;
 607         return x;
 608 }
 609
 610 static inline int sane_iscase(int x, int is_lower)
 611 {
 612         if (!sane_istest(x, GIT_ALPHA))
 613                 return 0;
 614
 615         if (is_lower)
 616                 return (x & 0x20) != 0;
 617         else
 618                 return (x & 0x20) == 0;
 619 }
 620
 621 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 622 {
 623         unsigned long ul;
 624         char *p;
 625
 626         errno = 0;
 627         ul = strtoul(s, &p, base);
 628         if (errno || *p || p == s || (unsigned int) ul != ul)
 629                 return -1;
 630         *result = ul;
 631         return 0;
 632 }
 633
 634 static inline int strtol_i(char const *s, int base, int *result)
 635 {
 636         long ul;
 637         char *p;
 638
 639         errno = 0;
 640         ul = strtol(s, &p, base);
 641         if (errno || *p || p == s || (int) ul != ul)
 642                 return -1;
 643         *result = ul;
 644         return 0;
 645 }
 646
 647 #ifdef INTERNAL_QSORT
 648 void git_qsort(void *base, size_t nmemb, size_t size,
 649                int(*compar)(const void *, const void *));
 650 #define qsort git_qsort
 651 #endif
 652
 653 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 654 # define FORCE_DIR_SET_GID S_ISGID
 655 #else
 656 # define FORCE_DIR_SET_GID 0
 657 #endif
 658
 659 #ifdef NO_NSEC
 660 #undef USE_NSEC
 661 #define ST_CTIME_NSEC(st) 0
 662 #define ST_MTIME_NSEC(st) 0
 663 #else
 664 #ifdef USE_ST_TIMESPEC
 665 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 666 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 667 #else
 668 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 669 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 670 #endif
 671 #endif
 672
 673 #ifdef UNRELIABLE_FSTAT
 674 #define fstat_is_reliable() 0
 675 #else
 676 #define fstat_is_reliable() 1
 677 #endif
 678
 679 #ifndef va_copy
 680 /*
 681  * Since an obvious implementation of va_list would be to make it a
 682  * pointer into the stack frame, a simple assignment will work on
 683  * many systems.  But let's try to be more portable.
 684  */
 685 #ifdef __va_copy
 686 #define va_copy(dst, src) __va_copy(dst, src)
 687 #else
 688 #define va_copy(dst, src) ((dst) = (src))
 689 #endif
 690 #endif
 691
 692 /*
 693  * Preserves errno, prints a message, but gives no warning for ENOENT.
 694  * Always returns the return value of unlink(2).
 695  */
 696 int unlink_or_warn(const char *path);
 697 /*
 698  * Likewise for rmdir(2).
 699  */
 700 int rmdir_or_warn(const char *path);
 701 /*
 702  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 703  * the supplied file mode.
 704  */
 705 int remove_or_warn(unsigned int mode, const char *path);
 706
 707 /*
 708  * Call access(2), but warn for any error except "missing file"
 709  * (ENOENT or ENOTDIR).
 710  */
 711 #define ACCESS_EACCES_OK (1U << 0)
 712 int access_or_warn(const char *path, int mode, unsigned flag);
 713 int access_or_die(const char *path, int mode, unsigned flag);
 714
 715 /* Warn on an inaccessible file that ought to be accessible */
 716 void warn_on_inaccessible(const char *path);
 717
 718 /* Get the passwd entry for the UID of the current process. */
 719 struct passwd *xgetpwuid_self(void);
 720
 721 #ifdef GMTIME_UNRELIABLE_ERRORS
 722 struct tm *git_gmtime(const time_t *);
 723 struct tm *git_gmtime_r(const time_t *, struct tm *);
 724 #define gmtime git_gmtime
 725 #define gmtime_r git_gmtime_r
 726 #endif
 727
 728 #ifndef mark_as_git_dir
 729 #define mark_as_git_dir(x) /* noop */
 730 #endif
 731
 732 #ifndef get_home_directory
 733 #define get_home_directory() getenv("HOME")
 734 #endif
 735
 736 /*
 737  * Enable/disable a read-only cache for file system data on platforms that
 738  * support it.
 739  *
 740  * Implementing a live-cache is complicated and requires special platform
 741  * support (inotify, ReadDirectoryChangesW...). enable_fscache shall be used
 742  * to mark sections of git code that extensively read from the file system
 743  * without modifying anything. Implementations can use this to cache e.g. stat
 744  * data or even file content without the need to synchronize with the file
 745  * system.
 746  */
 747 #ifndef enable_fscache
 748 #define enable_fscache(x) /* noop */
 749 #endif
 750
 751 #endif