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       !defined(__CYGWIN__)
  80 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  81 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  82 #endif
  83 #define _ALL_SOURCE 1
  84 #define _GNU_SOURCE 1
  85 #define _BSD_SOURCE 1
  86 #define _DEFAULT_SOURCE 1
  87 #define _NETBSD_SOURCE 1
  88 #define _SGI_SOURCE 1
  89
  90 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  91 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  92 #  define _WIN32_WINNT 0x0502
  93 # endif
  94 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  95 #include <winsock2.h>
  96 #include <windows.h>
  97 #define GIT_WINDOWS_NATIVE
  98 #endif
  99
 100 #include <unistd.h>
 101 #include <stdio.h>
 102 #include <sys/stat.h>
 103 #include <fcntl.h>
 104 #include <stddef.h>
 105 #include <stdlib.h>
 106 #include <stdarg.h>
 107 #include <string.h>
 108 #ifdef HAVE_STRINGS_H
 109 #include <strings.h> /* for strcasecmp() */
 110 #endif
 111 #include <errno.h>
 112 #include <limits.h>
 113 #ifdef NEEDS_SYS_PARAM_H
 114 #include <sys/param.h>
 115 #endif
 116 #include <sys/types.h>
 117 #include <dirent.h>
 118 #include <sys/time.h>
 119 #include <time.h>
 120 #include <signal.h>
 121 #include <assert.h>
 122 #include <regex.h>
 123 #include <utime.h>
 124 #include <syslog.h>
 125 #ifndef NO_SYS_POLL_H
 126 #include <sys/poll.h>
 127 #else
 128 #include <poll.h>
 129 #endif
 130
 131 #if defined(__MINGW32__)
 132 /* pull in Windows compatibility stuff */
 133 #include "compat/mingw.h"
 134 #elif defined(_MSC_VER)
 135 #include "compat/msvc.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 static inline int git_has_dos_drive_prefix(const char *path)
 270 {
 271         return 0;
 272 }
 273 #define has_dos_drive_prefix git_has_dos_drive_prefix
 274 #endif
 275
 276 #ifndef is_dir_sep
 277 static inline int git_is_dir_sep(int c)
 278 {
 279         return c == '/';
 280 }
 281 #define is_dir_sep git_is_dir_sep
 282 #endif
 283
 284 #ifndef offset_1st_component
 285 static inline int git_offset_1st_component(const char *path)
 286 {
 287         return is_dir_sep(path[0]);
 288 }
 289 #define offset_1st_component git_offset_1st_component
 290 #endif
 291
 292 #ifndef find_last_dir_sep
 293 static inline char *git_find_last_dir_sep(const char *path)
 294 {
 295         return strrchr(path, '/');
 296 }
 297 #define find_last_dir_sep git_find_last_dir_sep
 298 #endif
 299
 300 #if defined(__HP_cc) && (__HP_cc >= 61000)
 301 #define NORETURN __attribute__((noreturn))
 302 #define NORETURN_PTR
 303 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 304 #define NORETURN __attribute__((__noreturn__))
 305 #define NORETURN_PTR __attribute__((__noreturn__))
 306 #elif defined(_MSC_VER)
 307 #define NORETURN __declspec(noreturn)
 308 #define NORETURN_PTR
 309 #else
 310 #define NORETURN
 311 #define NORETURN_PTR
 312 #ifndef __GNUC__
 313 #ifndef __attribute__
 314 #define __attribute__(x)
 315 #endif
 316 #endif
 317 #endif
 318
 319 /* The sentinel attribute is valid from gcc version 4.0 */
 320 #if defined(__GNUC__) && (__GNUC__ >= 4)
 321 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 322 #else
 323 #define LAST_ARG_MUST_BE_NULL
 324 #endif
 325
 326 #include "compat/bswap.h"
 327
 328 #include "wildmatch.h"
 329
 330 struct strbuf;
 331
 332 /* General helper functions */
 333 extern void vreportf(const char *prefix, const char *err, va_list params);
 334 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 335 extern NORETURN void usage(const char *err);
 336 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 337 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 338 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 339 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 340 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 341
 342 #ifndef NO_OPENSSL
 343 #ifdef APPLE_COMMON_CRYPTO
 344 #include "compat/apple-common-crypto.h"
 345 #else
 346 #include <openssl/evp.h>
 347 #include <openssl/hmac.h>
 348 #endif /* APPLE_COMMON_CRYPTO */
 349 #include <openssl/x509v3.h>
 350 #endif /* NO_OPENSSL */
 351
 352 /*
 353  * Let callers be aware of the constant return value; this can help
 354  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 355  * because some compilers may not support variadic macros. Since we're only
 356  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 357  * using the function as usual.
 358  */
 359 #if defined(__GNUC__)
 360 static inline int const_error(void)
 361 {
 362         return -1;
 363 }
 364 #define error(...) (error(__VA_ARGS__), const_error())
 365 #endif
 366
 367 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 368 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 369 extern void set_die_is_recursing_routine(int (*routine)(void));
 370
 371 extern int starts_with(const char *str, const char *prefix);
 372
 373 /*
 374  * If the string "str" begins with the string found in "prefix", return 1.
 375  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 376  * the string right after the prefix).
 377  *
 378  * Otherwise, return 0 and leave "out" untouched.
 379  *
 380  * Examples:
 381  *
 382  *   [extract branch name, fail if not a branch]
 383  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 384  *      return -1;
 385  *
 386  *   [skip prefix if present, otherwise use whole string]
 387  *   skip_prefix(name, "refs/heads/", &name);
 388  */
 389 static inline int skip_prefix(const char *str, const char *prefix,
 390                               const char **out)
 391 {
 392         do {
 393                 if (!*prefix) {
 394                         *out = str;
 395                         return 1;
 396                 }
 397         } while (*str++ == *prefix++);
 398         return 0;
 399 }
 400
 401 /*
 402  * If buf ends with suffix, return 1 and subtract the length of the suffix
 403  * from *len. Otherwise, return 0 and leave *len untouched.
 404  */
 405 static inline int strip_suffix_mem(const char *buf, size_t *len,
 406                                    const char *suffix)
 407 {
 408         size_t suflen = strlen(suffix);
 409         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 410                 return 0;
 411         *len -= suflen;
 412         return 1;
 413 }
 414
 415 /*
 416  * If str ends with suffix, return 1 and set *len to the size of the string
 417  * without the suffix. Otherwise, return 0 and set *len to the size of the
 418  * string.
 419  *
 420  * Note that we do _not_ NUL-terminate str to the new length.
 421  */
 422 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 423 {
 424         *len = strlen(str);
 425         return strip_suffix_mem(str, len, suffix);
 426 }
 427
 428 static inline int ends_with(const char *str, const char *suffix)
 429 {
 430         size_t len;
 431         return strip_suffix(str, suffix, &len);
 432 }
 433
 434 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 435
 436 #ifndef PROT_READ
 437 #define PROT_READ 1
 438 #define PROT_WRITE 2
 439 #define MAP_PRIVATE 1
 440 #endif
 441
 442 #define mmap git_mmap
 443 #define munmap git_munmap
 444 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 445 extern int git_munmap(void *start, size_t length);
 446
 447 #else /* NO_MMAP || USE_WIN32_MMAP */
 448
 449 #include <sys/mman.h>
 450
 451 #endif /* NO_MMAP || USE_WIN32_MMAP */
 452
 453 #ifdef NO_MMAP
 454
 455 /* This value must be multiple of (pagesize * 2) */
 456 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 457
 458 #else /* NO_MMAP */
 459
 460 /* This value must be multiple of (pagesize * 2) */
 461 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 462         (sizeof(void*) >= 8 \
 463                 ?  1 * 1024 * 1024 * 1024 \
 464                 : 32 * 1024 * 1024)
 465
 466 #endif /* NO_MMAP */
 467
 468 #ifndef MAP_FAILED
 469 #define MAP_FAILED ((void *)-1)
 470 #endif
 471
 472 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 473 #define on_disk_bytes(st) ((st).st_size)
 474 #else
 475 #define on_disk_bytes(st) ((st).st_blocks * 512)
 476 #endif
 477
 478 #ifdef NEEDS_MODE_TRANSLATION
 479 #undef S_IFMT
 480 #undef S_IFREG
 481 #undef S_IFDIR
 482 #undef S_IFLNK
 483 #undef S_IFBLK
 484 #undef S_IFCHR
 485 #undef S_IFIFO
 486 #undef S_IFSOCK
 487 #define S_IFMT   0170000
 488 #define S_IFREG  0100000
 489 #define S_IFDIR  0040000
 490 #define S_IFLNK  0120000
 491 #define S_IFBLK  0060000
 492 #define S_IFCHR  0020000
 493 #define S_IFIFO  0010000
 494 #define S_IFSOCK 0140000
 495 #ifdef stat
 496 #undef stat
 497 #endif
 498 #define stat(path, buf) git_stat(path, buf)
 499 extern int git_stat(const char *, struct stat *);
 500 #ifdef fstat
 501 #undef fstat
 502 #endif
 503 #define fstat(fd, buf) git_fstat(fd, buf)
 504 extern int git_fstat(int, struct stat *);
 505 #ifdef lstat
 506 #undef lstat
 507 #endif
 508 #define lstat(path, buf) git_lstat(path, buf)
 509 extern int git_lstat(const char *, struct stat *);
 510 #endif
 511
 512 #define DEFAULT_PACKED_GIT_LIMIT \
 513         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 514
 515 #ifdef NO_PREAD
 516 #define pread git_pread
 517 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 518 #endif
 519 /*
 520  * Forward decl that will remind us if its twin in cache.h changes.
 521  * This function is used in compat/pread.c.  But we can't include
 522  * cache.h there.
 523  */
 524 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 525
 526 #ifdef NO_SETENV
 527 #define setenv gitsetenv
 528 extern int gitsetenv(const char *, const char *, int);
 529 #endif
 530
 531 #ifdef NO_MKDTEMP
 532 #define mkdtemp gitmkdtemp
 533 extern char *gitmkdtemp(char *);
 534 #endif
 535
 536 #ifdef NO_MKSTEMPS
 537 #define mkstemps gitmkstemps
 538 extern int gitmkstemps(char *, int);
 539 #endif
 540
 541 #ifdef NO_UNSETENV
 542 #define unsetenv gitunsetenv
 543 extern void gitunsetenv(const char *);
 544 #endif
 545
 546 #ifdef NO_STRCASESTR
 547 #define strcasestr gitstrcasestr
 548 extern char *gitstrcasestr(const char *haystack, const char *needle);
 549 #endif
 550
 551 #ifdef NO_STRLCPY
 552 #define strlcpy gitstrlcpy
 553 extern size_t gitstrlcpy(char *, const char *, size_t);
 554 #endif
 555
 556 #ifdef NO_STRTOUMAX
 557 #define strtoumax gitstrtoumax
 558 extern uintmax_t gitstrtoumax(const char *, char **, int);
 559 #define strtoimax gitstrtoimax
 560 extern intmax_t gitstrtoimax(const char *, char **, int);
 561 #endif
 562
 563 #ifdef NO_HSTRERROR
 564 #define hstrerror githstrerror
 565 extern const char *githstrerror(int herror);
 566 #endif
 567
 568 #ifdef NO_MEMMEM
 569 #define memmem gitmemmem
 570 void *gitmemmem(const void *haystack, size_t haystacklen,
 571                 const void *needle, size_t needlelen);
 572 #endif
 573
 574 #ifdef NO_GETPAGESIZE
 575 #define getpagesize() sysconf(_SC_PAGESIZE)
 576 #endif
 577
 578 #ifdef FREAD_READS_DIRECTORIES
 579 #ifdef fopen
 580 #undef fopen
 581 #endif
 582 #define fopen(a,b) git_fopen(a,b)
 583 extern FILE *git_fopen(const char*, const char*);
 584 #endif
 585
 586 #ifdef SNPRINTF_RETURNS_BOGUS
 587 #ifdef snprintf
 588 #undef snprintf
 589 #endif
 590 #define snprintf git_snprintf
 591 extern int git_snprintf(char *str, size_t maxsize,
 592                         const char *format, ...);
 593 #ifdef vsnprintf
 594 #undef vsnprintf
 595 #endif
 596 #define vsnprintf git_vsnprintf
 597 extern int git_vsnprintf(char *str, size_t maxsize,
 598                          const char *format, va_list ap);
 599 #endif
 600
 601 #ifdef __GLIBC_PREREQ
 602 #if __GLIBC_PREREQ(2, 1)
 603 #define HAVE_STRCHRNUL
 604 #define HAVE_MEMPCPY
 605 #endif
 606 #endif
 607
 608 #ifndef HAVE_STRCHRNUL
 609 #define strchrnul gitstrchrnul
 610 static inline char *gitstrchrnul(const char *s, int c)
 611 {
 612         while (*s && *s != c)
 613                 s++;
 614         return (char *)s;
 615 }
 616 #endif
 617
 618 #ifndef HAVE_MEMPCPY
 619 #define mempcpy gitmempcpy
 620 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 621 {
 622         return (char *)memcpy(dest, src, n) + n;
 623 }
 624 #endif
 625
 626 #ifdef NO_INET_PTON
 627 int inet_pton(int af, const char *src, void *dst);
 628 #endif
 629
 630 #ifdef NO_INET_NTOP
 631 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 632 #endif
 633
 634 #ifdef NO_PTHREADS
 635 #define atexit git_atexit
 636 extern int git_atexit(void (*handler)(void));
 637 #endif
 638
 639 extern void release_pack_memory(size_t);
 640
 641 typedef void (*try_to_free_t)(size_t);
 642 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 643
 644 #ifdef HAVE_ALLOCA_H
 645 # include <alloca.h>
 646 # define xalloca(size)      (alloca(size))
 647 # define xalloca_free(p)    do {} while (0)
 648 #else
 649 # define xalloca(size)      (xmalloc(size))
 650 # define xalloca_free(p)    (free(p))
 651 #endif
 652 extern char *xstrdup(const char *str);
 653 extern void *xmalloc(size_t size);
 654 extern void *xmallocz(size_t size);
 655 extern void *xmallocz_gently(size_t size);
 656 extern void *xmemdupz(const void *data, size_t len);
 657 extern char *xstrndup(const char *str, size_t len);
 658 extern void *xrealloc(void *ptr, size_t size);
 659 extern void *xcalloc(size_t nmemb, size_t size);
 660 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 661 extern ssize_t xread(int fd, void *buf, size_t len);
 662 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 663 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 664 extern int xdup(int fd);
 665 extern FILE *xfdopen(int fd, const char *mode);
 666 extern int xmkstemp(char *template);
 667 extern int xmkstemp_mode(char *template, int mode);
 668 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 669 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 670 extern char *xgetcwd(void);
 671
 672 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 673
 674 static inline size_t xsize_t(off_t len)
 675 {
 676         if (len > (size_t) len)
 677                 die("Cannot handle files this big");
 678         return (size_t)len;
 679 }
 680
 681 /* in ctype.c, for kwset users */
 682 extern const char tolower_trans_tbl[256];
 683
 684 /* Sane ctype - no locale, and works with signed chars */
 685 #undef isascii
 686 #undef isspace
 687 #undef isdigit
 688 #undef isalpha
 689 #undef isalnum
 690 #undef isprint
 691 #undef islower
 692 #undef isupper
 693 #undef tolower
 694 #undef toupper
 695 #undef iscntrl
 696 #undef ispunct
 697 #undef isxdigit
 698
 699 extern const unsigned char sane_ctype[256];
 700 #define GIT_SPACE 0x01
 701 #define GIT_DIGIT 0x02
 702 #define GIT_ALPHA 0x04
 703 #define GIT_GLOB_SPECIAL 0x08
 704 #define GIT_REGEX_SPECIAL 0x10
 705 #define GIT_PATHSPEC_MAGIC 0x20
 706 #define GIT_CNTRL 0x40
 707 #define GIT_PUNCT 0x80
 708 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 709 #define isascii(x) (((x) & ~0x7f) == 0)
 710 #define isspace(x) sane_istest(x,GIT_SPACE)
 711 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 712 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 713 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 714 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 715 #define islower(x) sane_iscase(x, 1)
 716 #define isupper(x) sane_iscase(x, 0)
 717 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 718 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 719 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 720 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 721                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 722 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 723 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 724 #define toupper(x) sane_case((unsigned char)(x), 0)
 725 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 726
 727 static inline int sane_case(int x, int high)
 728 {
 729         if (sane_istest(x, GIT_ALPHA))
 730                 x = (x & ~0x20) | high;
 731         return x;
 732 }
 733
 734 static inline int sane_iscase(int x, int is_lower)
 735 {
 736         if (!sane_istest(x, GIT_ALPHA))
 737                 return 0;
 738
 739         if (is_lower)
 740                 return (x & 0x20) != 0;
 741         else
 742                 return (x & 0x20) == 0;
 743 }
 744
 745 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 746 {
 747         unsigned long ul;
 748         char *p;
 749
 750         errno = 0;
 751         ul = strtoul(s, &p, base);
 752         if (errno || *p || p == s || (unsigned int) ul != ul)
 753                 return -1;
 754         *result = ul;
 755         return 0;
 756 }
 757
 758 static inline int strtol_i(char const *s, int base, int *result)
 759 {
 760         long ul;
 761         char *p;
 762
 763         errno = 0;
 764         ul = strtol(s, &p, base);
 765         if (errno || *p || p == s || (int) ul != ul)
 766                 return -1;
 767         *result = ul;
 768         return 0;
 769 }
 770
 771 #ifdef INTERNAL_QSORT
 772 void git_qsort(void *base, size_t nmemb, size_t size,
 773                int(*compar)(const void *, const void *));
 774 #define qsort git_qsort
 775 #endif
 776
 777 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 778 # define FORCE_DIR_SET_GID S_ISGID
 779 #else
 780 # define FORCE_DIR_SET_GID 0
 781 #endif
 782
 783 #ifdef NO_NSEC
 784 #undef USE_NSEC
 785 #define ST_CTIME_NSEC(st) 0
 786 #define ST_MTIME_NSEC(st) 0
 787 #else
 788 #ifdef USE_ST_TIMESPEC
 789 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 790 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 791 #else
 792 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 793 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 794 #endif
 795 #endif
 796
 797 #ifdef UNRELIABLE_FSTAT
 798 #define fstat_is_reliable() 0
 799 #else
 800 #define fstat_is_reliable() 1
 801 #endif
 802
 803 #ifndef va_copy
 804 /*
 805  * Since an obvious implementation of va_list would be to make it a
 806  * pointer into the stack frame, a simple assignment will work on
 807  * many systems.  But let's try to be more portable.
 808  */
 809 #ifdef __va_copy
 810 #define va_copy(dst, src) __va_copy(dst, src)
 811 #else
 812 #define va_copy(dst, src) ((dst) = (src))
 813 #endif
 814 #endif
 815
 816 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 817 #define HAVE_VARIADIC_MACROS 1
 818 #endif
 819
 820 /*
 821  * Preserves errno, prints a message, but gives no warning for ENOENT.
 822  * Returns 0 on success, which includes trying to unlink an object that does
 823  * not exist.
 824  */
 825 int unlink_or_warn(const char *path);
 826  /*
 827   * Tries to unlink file.  Returns 0 if unlink succeeded
 828   * or the file already didn't exist.  Returns -1 and
 829   * appends a message to err suitable for
 830   * 'error("%s", err->buf)' on error.
 831   */
 832 int unlink_or_msg(const char *file, struct strbuf *err);
 833 /*
 834  * Preserves errno, prints a message, but gives no warning for ENOENT.
 835  * Returns 0 on success, which includes trying to remove a directory that does
 836  * not exist.
 837  */
 838 int rmdir_or_warn(const char *path);
 839 /*
 840  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 841  * the supplied file mode.
 842  */
 843 int remove_or_warn(unsigned int mode, const char *path);
 844
 845 /*
 846  * Call access(2), but warn for any error except "missing file"
 847  * (ENOENT or ENOTDIR).
 848  */
 849 #define ACCESS_EACCES_OK (1U << 0)
 850 int access_or_warn(const char *path, int mode, unsigned flag);
 851 int access_or_die(const char *path, int mode, unsigned flag);
 852
 853 /* Warn on an inaccessible file that ought to be accessible */
 854 void warn_on_inaccessible(const char *path);
 855
 856 /* Get the passwd entry for the UID of the current process. */
 857 struct passwd *xgetpwuid_self(void);
 858
 859 #ifdef GMTIME_UNRELIABLE_ERRORS
 860 struct tm *git_gmtime(const time_t *);
 861 struct tm *git_gmtime_r(const time_t *, struct tm *);
 862 #define gmtime git_gmtime
 863 #define gmtime_r git_gmtime_r
 864 #endif
 865
 866 #endif