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
   7 /* Derived from Linux "Features Test Macro" header
   8  * Convenience macros to test the versions of gcc (or
   9  * a compatible compiler).
  10  * Use them like this:
  11  *  #if GIT_GNUC_PREREQ (2,8)
  12  *   ... code requiring gcc 2.8 or later ...
  13  *  #endif
  14 */
  15 #if defined(__GNUC__) && defined(__GNUC_MINOR__)
  16 # define GIT_GNUC_PREREQ(maj, min) \
  17         ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  18 #else
  19  #define GIT_GNUC_PREREQ(maj, min) 0
  20 #endif
  21
  22
  23 #ifndef FLEX_ARRAY
  24 /*
  25  * See if our compiler is known to support flexible array members.
  26  */
  27 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  28 # define FLEX_ARRAY /* empty */
  29 #elif defined(__GNUC__)
  30 # if (__GNUC__ >= 3)
  31 #  define FLEX_ARRAY /* empty */
  32 # else
  33 #  define FLEX_ARRAY 0 /* older GNU extension */
  34 # endif
  35 #endif
  36
  37 /*
  38  * Otherwise, default to safer but a bit wasteful traditional style
  39  */
  40 #ifndef FLEX_ARRAY
  41 # define FLEX_ARRAY 1
  42 #endif
  43 #endif
  44
  45
  46 /*
  47  * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
  48  * @cond: the compile-time condition which must be true.
  49  *
  50  * Your compile will fail if the condition isn't true, or can't be evaluated
  51  * by the compiler.  This can be used in an expression: its value is "0".
  52  *
  53  * Example:
  54  *      #define foo_to_char(foo)                                        \
  55  *               ((char *)(foo)                                         \
  56  *                + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
  57  */
  58 #define BUILD_ASSERT_OR_ZERO(cond) \
  59         (sizeof(char [1 - 2*!(cond)]) - 1)
  60
  61 #if GIT_GNUC_PREREQ(3, 1)
  62  /* &arr[0] degrades to a pointer: a different type from an array */
  63 # define BARF_UNLESS_AN_ARRAY(arr)                                              \
  64         BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
  65                                                            __typeof__(&(arr)[0])))
  66 #else
  67 # define BARF_UNLESS_AN_ARRAY(arr) 0
  68 #endif
  69 /*
  70  * ARRAY_SIZE - get the number of elements in a visible array
  71  *  <at> x: the array whose size you want.
  72  *
  73  * This does not work on pointers, or arrays declared as [], or
  74  * function parameters.  With correct compiler support, such usage
  75  * will cause a build error (see the build_assert_or_zero macro).
  76  */
  77 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
  78
  79 #define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  80
  81 #define maximum_signed_value_of_type(a) \
  82     (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  83
  84 #define maximum_unsigned_value_of_type(a) \
  85     (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  86
  87 /*
  88  * Signed integer overflow is undefined in C, so here's a helper macro
  89  * to detect if the sum of two integers will overflow.
  90  *
  91  * Requires: a >= 0, typeof(a) equals typeof(b)
  92  */
  93 #define signed_add_overflows(a, b) \
  94     ((b) > maximum_signed_value_of_type(a) - (a))
  95
  96 #define unsigned_add_overflows(a, b) \
  97     ((b) > maximum_unsigned_value_of_type(a) - (a))
  98
  99 #ifdef __GNUC__
 100 #define TYPEOF(x) (__typeof__(x))
 101 #else
 102 #define TYPEOF(x)
 103 #endif
 104
 105 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 106 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 107
 108 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 109
 110 /* Approximation of the length of the decimal representation of this type. */
 111 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 112
 113 #if defined(__sun__)
 114  /*
 115   * On Solaris, when _XOPEN_EXTENDED is set, its header file
 116   * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 117   * setting to say we are XPG5 or XPG6.  Also on Solaris,
 118   * XPG6 programs must be compiled with a c99 compiler, while
 119   * non XPG6 programs must be compiled with a pre-c99 compiler.
 120   */
 121 # if __STDC_VERSION__ - 0 >= 199901L
 122 # define _XOPEN_SOURCE 600
 123 # else
 124 # define _XOPEN_SOURCE 500
 125 # endif
 126 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 127       !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 128       !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 129       !defined(__CYGWIN__)
 130 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 131 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 132 #endif
 133 #define _ALL_SOURCE 1
 134 #define _GNU_SOURCE 1
 135 #define _BSD_SOURCE 1
 136 #define _DEFAULT_SOURCE 1
 137 #define _NETBSD_SOURCE 1
 138 #define _SGI_SOURCE 1
 139
 140 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 141 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 142 #  define _WIN32_WINNT 0x0502
 143 # endif
 144 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 145 #include <winsock2.h>
 146 #include <windows.h>
 147 #define GIT_WINDOWS_NATIVE
 148 #endif
 149
 150 #include <unistd.h>
 151 #include <stdio.h>
 152 #include <sys/stat.h>
 153 #include <fcntl.h>
 154 #include <stddef.h>
 155 #include <stdlib.h>
 156 #include <stdarg.h>
 157 #include <string.h>
 158 #ifdef HAVE_STRINGS_H
 159 #include <strings.h> /* for strcasecmp() */
 160 #endif
 161 #include <errno.h>
 162 #include <limits.h>
 163 #ifdef NEEDS_SYS_PARAM_H
 164 #include <sys/param.h>
 165 #endif
 166 #include <sys/types.h>
 167 #include <dirent.h>
 168 #include <sys/time.h>
 169 #include <time.h>
 170 #include <signal.h>
 171 #include <assert.h>
 172 #include <regex.h>
 173 #include <utime.h>
 174 #include <syslog.h>
 175 #ifndef NO_SYS_POLL_H
 176 #include <sys/poll.h>
 177 #else
 178 #include <poll.h>
 179 #endif
 180 #ifdef HAVE_BSD_SYSCTL
 181 #include <sys/sysctl.h>
 182 #endif
 183
 184 #if defined(__MINGW32__)
 185 /* pull in Windows compatibility stuff */
 186 #include "compat/mingw.h"
 187 #elif defined(_MSC_VER)
 188 #include "compat/msvc.h"
 189 #else
 190 #include <sys/utsname.h>
 191 #include <sys/wait.h>
 192 #include <sys/resource.h>
 193 #include <sys/socket.h>
 194 #include <sys/ioctl.h>
 195 #include <termios.h>
 196 #ifndef NO_SYS_SELECT_H
 197 #include <sys/select.h>
 198 #endif
 199 #include <netinet/in.h>
 200 #include <netinet/tcp.h>
 201 #include <arpa/inet.h>
 202 #include <netdb.h>
 203 #include <pwd.h>
 204 #include <sys/un.h>
 205 #ifndef NO_INTTYPES_H
 206 #include <inttypes.h>
 207 #else
 208 #include <stdint.h>
 209 #endif
 210 #ifdef NO_INTPTR_T
 211 /*
 212  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 213  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 214  * while on IP16 and IP16L32 it is "int" (resp. "short")
 215  * Size needs to match (or exceed) 'sizeof(void *)'.
 216  * We can't take "long long" here as not everybody has it.
 217  */
 218 typedef long intptr_t;
 219 typedef unsigned long uintptr_t;
 220 #endif
 221 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 222 #include <grp.h>
 223 #define _ALL_SOURCE 1
 224 #endif
 225
 226 /* used on Mac OS X */
 227 #ifdef PRECOMPOSE_UNICODE
 228 #include "compat/precompose_utf8.h"
 229 #else
 230 #define precompose_str(in,i_nfd2nfc)
 231 #define precompose_argv(c,v)
 232 #define probe_utf8_pathname_composition()
 233 #endif
 234
 235 #ifdef MKDIR_WO_TRAILING_SLASH
 236 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 237 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 238 #endif
 239
 240 #ifdef NO_STRUCT_ITIMERVAL
 241 struct itimerval {
 242         struct timeval it_interval;
 243         struct timeval it_value;
 244 };
 245 #endif
 246
 247 #ifdef NO_SETITIMER
 248 #define setitimer(which,value,ovalue)
 249 #endif
 250
 251 #ifndef NO_LIBGEN_H
 252 #include <libgen.h>
 253 #else
 254 #define basename gitbasename
 255 extern char *gitbasename(char *);
 256 #define dirname gitdirname
 257 extern char *gitdirname(char *);
 258 #endif
 259
 260 #ifndef NO_ICONV
 261 #include <iconv.h>
 262 #endif
 263
 264 #ifndef NO_OPENSSL
 265 #ifdef __APPLE__
 266 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 267 #include <AvailabilityMacros.h>
 268 #undef DEPRECATED_ATTRIBUTE
 269 #define DEPRECATED_ATTRIBUTE
 270 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 271 #endif
 272 #include <openssl/ssl.h>
 273 #include <openssl/err.h>
 274 #ifdef NO_HMAC_CTX_CLEANUP
 275 #define HMAC_CTX_cleanup HMAC_cleanup
 276 #endif
 277 #endif
 278
 279 /* On most systems <netdb.h> would have given us this, but
 280  * not on some systems (e.g. z/OS).
 281  */
 282 #ifndef NI_MAXHOST
 283 #define NI_MAXHOST 1025
 284 #endif
 285
 286 #ifndef NI_MAXSERV
 287 #define NI_MAXSERV 32
 288 #endif
 289
 290 /* On most systems <limits.h> would have given us this, but
 291  * not on some systems (e.g. GNU/Hurd).
 292  */
 293 #ifndef PATH_MAX
 294 #define PATH_MAX 4096
 295 #endif
 296
 297 #ifndef PRIuMAX
 298 #define PRIuMAX "llu"
 299 #endif
 300
 301 #ifndef SCNuMAX
 302 #define SCNuMAX PRIuMAX
 303 #endif
 304
 305 #ifndef PRIu32
 306 #define PRIu32 "u"
 307 #endif
 308
 309 #ifndef PRIx32
 310 #define PRIx32 "x"
 311 #endif
 312
 313 #ifndef PRIo32
 314 #define PRIo32 "o"
 315 #endif
 316
 317 #ifndef PATH_SEP
 318 #define PATH_SEP ':'
 319 #endif
 320
 321 #ifdef HAVE_PATHS_H
 322 #include <paths.h>
 323 #endif
 324 #ifndef _PATH_DEFPATH
 325 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 326 #endif
 327
 328 #ifndef STRIP_EXTENSION
 329 #define STRIP_EXTENSION ""
 330 #endif
 331
 332 #ifndef has_dos_drive_prefix
 333 static inline int git_has_dos_drive_prefix(const char *path)
 334 {
 335         return 0;
 336 }
 337 #define has_dos_drive_prefix git_has_dos_drive_prefix
 338 #endif
 339
 340 #ifndef skip_dos_drive_prefix
 341 static inline int git_skip_dos_drive_prefix(char **path)
 342 {
 343         return 0;
 344 }
 345 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
 346 #endif
 347
 348 #ifndef is_dir_sep
 349 static inline int git_is_dir_sep(int c)
 350 {
 351         return c == '/';
 352 }
 353 #define is_dir_sep git_is_dir_sep
 354 #endif
 355
 356 #ifndef offset_1st_component
 357 static inline int git_offset_1st_component(const char *path)
 358 {
 359         return is_dir_sep(path[0]);
 360 }
 361 #define offset_1st_component git_offset_1st_component
 362 #endif
 363
 364 #ifndef find_last_dir_sep
 365 static inline char *git_find_last_dir_sep(const char *path)
 366 {
 367         return strrchr(path, '/');
 368 }
 369 #define find_last_dir_sep git_find_last_dir_sep
 370 #endif
 371
 372 #if defined(__HP_cc) && (__HP_cc >= 61000)
 373 #define NORETURN __attribute__((noreturn))
 374 #define NORETURN_PTR
 375 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 376 #define NORETURN __attribute__((__noreturn__))
 377 #define NORETURN_PTR __attribute__((__noreturn__))
 378 #elif defined(_MSC_VER)
 379 #define NORETURN __declspec(noreturn)
 380 #define NORETURN_PTR
 381 #else
 382 #define NORETURN
 383 #define NORETURN_PTR
 384 #ifndef __GNUC__
 385 #ifndef __attribute__
 386 #define __attribute__(x)
 387 #endif
 388 #endif
 389 #endif
 390
 391 /* The sentinel attribute is valid from gcc version 4.0 */
 392 #if defined(__GNUC__) && (__GNUC__ >= 4)
 393 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 394 #else
 395 #define LAST_ARG_MUST_BE_NULL
 396 #endif
 397
 398 #include "compat/bswap.h"
 399
 400 #include "wildmatch.h"
 401
 402 struct strbuf;
 403
 404 /* General helper functions */
 405 extern void vreportf(const char *prefix, const char *err, va_list params);
 406 extern NORETURN void usage(const char *err);
 407 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 408 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 409 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 410 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 411 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 412
 413 #ifndef NO_OPENSSL
 414 #ifdef APPLE_COMMON_CRYPTO
 415 #include "compat/apple-common-crypto.h"
 416 #else
 417 #include <openssl/evp.h>
 418 #include <openssl/hmac.h>
 419 #endif /* APPLE_COMMON_CRYPTO */
 420 #include <openssl/x509v3.h>
 421 #endif /* NO_OPENSSL */
 422
 423 /*
 424  * Let callers be aware of the constant return value; this can help
 425  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 426  * because some compilers may not support variadic macros. Since we're only
 427  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 428  * using the function as usual.
 429  */
 430 #if defined(__GNUC__)
 431 static inline int const_error(void)
 432 {
 433         return -1;
 434 }
 435 #define error(...) (error(__VA_ARGS__), const_error())
 436 #endif
 437
 438 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 439 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 440 extern void set_die_is_recursing_routine(int (*routine)(void));
 441 extern void set_error_handle(FILE *);
 442
 443 extern int starts_with(const char *str, const char *prefix);
 444
 445 /*
 446  * If the string "str" begins with the string found in "prefix", return 1.
 447  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 448  * the string right after the prefix).
 449  *
 450  * Otherwise, return 0 and leave "out" untouched.
 451  *
 452  * Examples:
 453  *
 454  *   [extract branch name, fail if not a branch]
 455  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 456  *      return -1;
 457  *
 458  *   [skip prefix if present, otherwise use whole string]
 459  *   skip_prefix(name, "refs/heads/", &name);
 460  */
 461 static inline int skip_prefix(const char *str, const char *prefix,
 462                               const char **out)
 463 {
 464         do {
 465                 if (!*prefix) {
 466                         *out = str;
 467                         return 1;
 468                 }
 469         } while (*str++ == *prefix++);
 470         return 0;
 471 }
 472
 473 /*
 474  * If buf ends with suffix, return 1 and subtract the length of the suffix
 475  * from *len. Otherwise, return 0 and leave *len untouched.
 476  */
 477 static inline int strip_suffix_mem(const char *buf, size_t *len,
 478                                    const char *suffix)
 479 {
 480         size_t suflen = strlen(suffix);
 481         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 482                 return 0;
 483         *len -= suflen;
 484         return 1;
 485 }
 486
 487 /*
 488  * If str ends with suffix, return 1 and set *len to the size of the string
 489  * without the suffix. Otherwise, return 0 and set *len to the size of the
 490  * string.
 491  *
 492  * Note that we do _not_ NUL-terminate str to the new length.
 493  */
 494 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 495 {
 496         *len = strlen(str);
 497         return strip_suffix_mem(str, len, suffix);
 498 }
 499
 500 static inline int ends_with(const char *str, const char *suffix)
 501 {
 502         size_t len;
 503         return strip_suffix(str, suffix, &len);
 504 }
 505
 506 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 507
 508 #ifndef PROT_READ
 509 #define PROT_READ 1
 510 #define PROT_WRITE 2
 511 #define MAP_PRIVATE 1
 512 #endif
 513
 514 #define mmap git_mmap
 515 #define munmap git_munmap
 516 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 517 extern int git_munmap(void *start, size_t length);
 518
 519 #else /* NO_MMAP || USE_WIN32_MMAP */
 520
 521 #include <sys/mman.h>
 522
 523 #endif /* NO_MMAP || USE_WIN32_MMAP */
 524
 525 #ifdef NO_MMAP
 526
 527 /* This value must be multiple of (pagesize * 2) */
 528 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 529
 530 #else /* NO_MMAP */
 531
 532 /* This value must be multiple of (pagesize * 2) */
 533 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 534         (sizeof(void*) >= 8 \
 535                 ?  1 * 1024 * 1024 * 1024 \
 536                 : 32 * 1024 * 1024)
 537
 538 #endif /* NO_MMAP */
 539
 540 #ifndef MAP_FAILED
 541 #define MAP_FAILED ((void *)-1)
 542 #endif
 543
 544 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 545 #define on_disk_bytes(st) ((st).st_size)
 546 #else
 547 #define on_disk_bytes(st) ((st).st_blocks * 512)
 548 #endif
 549
 550 #ifdef NEEDS_MODE_TRANSLATION
 551 #undef S_IFMT
 552 #undef S_IFREG
 553 #undef S_IFDIR
 554 #undef S_IFLNK
 555 #undef S_IFBLK
 556 #undef S_IFCHR
 557 #undef S_IFIFO
 558 #undef S_IFSOCK
 559 #define S_IFMT   0170000
 560 #define S_IFREG  0100000
 561 #define S_IFDIR  0040000
 562 #define S_IFLNK  0120000
 563 #define S_IFBLK  0060000
 564 #define S_IFCHR  0020000
 565 #define S_IFIFO  0010000
 566 #define S_IFSOCK 0140000
 567 #ifdef stat
 568 #undef stat
 569 #endif
 570 #define stat(path, buf) git_stat(path, buf)
 571 extern int git_stat(const char *, struct stat *);
 572 #ifdef fstat
 573 #undef fstat
 574 #endif
 575 #define fstat(fd, buf) git_fstat(fd, buf)
 576 extern int git_fstat(int, struct stat *);
 577 #ifdef lstat
 578 #undef lstat
 579 #endif
 580 #define lstat(path, buf) git_lstat(path, buf)
 581 extern int git_lstat(const char *, struct stat *);
 582 #endif
 583
 584 #define DEFAULT_PACKED_GIT_LIMIT \
 585         ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 586
 587 #ifdef NO_PREAD
 588 #define pread git_pread
 589 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 590 #endif
 591 /*
 592  * Forward decl that will remind us if its twin in cache.h changes.
 593  * This function is used in compat/pread.c.  But we can't include
 594  * cache.h there.
 595  */
 596 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 597
 598 #ifdef NO_SETENV
 599 #define setenv gitsetenv
 600 extern int gitsetenv(const char *, const char *, int);
 601 #endif
 602
 603 #ifdef NO_MKDTEMP
 604 #define mkdtemp gitmkdtemp
 605 extern char *gitmkdtemp(char *);
 606 #endif
 607
 608 #ifdef NO_MKSTEMPS
 609 #define mkstemps gitmkstemps
 610 extern int gitmkstemps(char *, int);
 611 #endif
 612
 613 #ifdef NO_UNSETENV
 614 #define unsetenv gitunsetenv
 615 extern void gitunsetenv(const char *);
 616 #endif
 617
 618 #ifdef NO_STRCASESTR
 619 #define strcasestr gitstrcasestr
 620 extern char *gitstrcasestr(const char *haystack, const char *needle);
 621 #endif
 622
 623 #ifdef NO_STRLCPY
 624 #define strlcpy gitstrlcpy
 625 extern size_t gitstrlcpy(char *, const char *, size_t);
 626 #endif
 627
 628 #ifdef NO_STRTOUMAX
 629 #define strtoumax gitstrtoumax
 630 extern uintmax_t gitstrtoumax(const char *, char **, int);
 631 #define strtoimax gitstrtoimax
 632 extern intmax_t gitstrtoimax(const char *, char **, int);
 633 #endif
 634
 635 #ifdef NO_HSTRERROR
 636 #define hstrerror githstrerror
 637 extern const char *githstrerror(int herror);
 638 #endif
 639
 640 #ifdef NO_MEMMEM
 641 #define memmem gitmemmem
 642 void *gitmemmem(const void *haystack, size_t haystacklen,
 643                 const void *needle, size_t needlelen);
 644 #endif
 645
 646 #ifdef NO_GETPAGESIZE
 647 #define getpagesize() sysconf(_SC_PAGESIZE)
 648 #endif
 649
 650 #ifdef FREAD_READS_DIRECTORIES
 651 #ifdef fopen
 652 #undef fopen
 653 #endif
 654 #define fopen(a,b) git_fopen(a,b)
 655 extern FILE *git_fopen(const char*, const char*);
 656 #endif
 657
 658 #ifdef SNPRINTF_RETURNS_BOGUS
 659 #ifdef snprintf
 660 #undef snprintf
 661 #endif
 662 #define snprintf git_snprintf
 663 extern int git_snprintf(char *str, size_t maxsize,
 664                         const char *format, ...);
 665 #ifdef vsnprintf
 666 #undef vsnprintf
 667 #endif
 668 #define vsnprintf git_vsnprintf
 669 extern int git_vsnprintf(char *str, size_t maxsize,
 670                          const char *format, va_list ap);
 671 #endif
 672
 673 #ifdef __GLIBC_PREREQ
 674 #if __GLIBC_PREREQ(2, 1)
 675 #define HAVE_STRCHRNUL
 676 #define HAVE_MEMPCPY
 677 #endif
 678 #endif
 679
 680 #ifndef HAVE_STRCHRNUL
 681 #define strchrnul gitstrchrnul
 682 static inline char *gitstrchrnul(const char *s, int c)
 683 {
 684         while (*s && *s != c)
 685                 s++;
 686         return (char *)s;
 687 }
 688 #endif
 689
 690 #ifndef HAVE_MEMPCPY
 691 #define mempcpy gitmempcpy
 692 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 693 {
 694         return (char *)memcpy(dest, src, n) + n;
 695 }
 696 #endif
 697
 698 #ifdef NO_INET_PTON
 699 int inet_pton(int af, const char *src, void *dst);
 700 #endif
 701
 702 #ifdef NO_INET_NTOP
 703 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 704 #endif
 705
 706 #ifdef NO_PTHREADS
 707 #define atexit git_atexit
 708 extern int git_atexit(void (*handler)(void));
 709 #endif
 710
 711 extern void release_pack_memory(size_t);
 712
 713 typedef void (*try_to_free_t)(size_t);
 714 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 715
 716 #ifdef HAVE_ALLOCA_H
 717 # include <alloca.h>
 718 # define xalloca(size)      (alloca(size))
 719 # define xalloca_free(p)    do {} while (0)
 720 #else
 721 # define xalloca(size)      (xmalloc(size))
 722 # define xalloca_free(p)    (free(p))
 723 #endif
 724 extern char *xstrdup(const char *str);
 725 extern void *xmalloc(size_t size);
 726 extern void *xmallocz(size_t size);
 727 extern void *xmallocz_gently(size_t size);
 728 extern void *xmemdupz(const void *data, size_t len);
 729 extern char *xstrndup(const char *str, size_t len);
 730 extern void *xrealloc(void *ptr, size_t size);
 731 extern void *xcalloc(size_t nmemb, size_t size);
 732 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 733 extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 734 extern int xopen(const char *path, int flags, ...);
 735 extern ssize_t xread(int fd, void *buf, size_t len);
 736 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 737 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 738 extern int xdup(int fd);
 739 extern FILE *xfopen(const char *path, const char *mode);
 740 extern FILE *xfdopen(int fd, const char *mode);
 741 extern int xmkstemp(char *template);
 742 extern int xmkstemp_mode(char *template, int mode);
 743 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 744 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 745 extern char *xgetcwd(void);
 746 extern FILE *fopen_for_writing(const char *path);
 747
 748 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 749
 750 static inline char *xstrdup_or_null(const char *str)
 751 {
 752         return str ? xstrdup(str) : NULL;
 753 }
 754
 755 static inline size_t xsize_t(off_t len)
 756 {
 757         if (len > (size_t) len)
 758                 die("Cannot handle files this big");
 759         return (size_t)len;
 760 }
 761
 762 __attribute__((format (printf, 3, 4)))
 763 extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 764
 765 /* in ctype.c, for kwset users */
 766 extern const unsigned char tolower_trans_tbl[256];
 767
 768 /* Sane ctype - no locale, and works with signed chars */
 769 #undef isascii
 770 #undef isspace
 771 #undef isdigit
 772 #undef isalpha
 773 #undef isalnum
 774 #undef isprint
 775 #undef islower
 776 #undef isupper
 777 #undef tolower
 778 #undef toupper
 779 #undef iscntrl
 780 #undef ispunct
 781 #undef isxdigit
 782
 783 extern const unsigned char sane_ctype[256];
 784 #define GIT_SPACE 0x01
 785 #define GIT_DIGIT 0x02
 786 #define GIT_ALPHA 0x04
 787 #define GIT_GLOB_SPECIAL 0x08
 788 #define GIT_REGEX_SPECIAL 0x10
 789 #define GIT_PATHSPEC_MAGIC 0x20
 790 #define GIT_CNTRL 0x40
 791 #define GIT_PUNCT 0x80
 792 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 793 #define isascii(x) (((x) & ~0x7f) == 0)
 794 #define isspace(x) sane_istest(x,GIT_SPACE)
 795 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 796 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 797 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 798 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 799 #define islower(x) sane_iscase(x, 1)
 800 #define isupper(x) sane_iscase(x, 0)
 801 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 802 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 803 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 804 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 805                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 806 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 807 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 808 #define toupper(x) sane_case((unsigned char)(x), 0)
 809 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 810
 811 static inline int sane_case(int x, int high)
 812 {
 813         if (sane_istest(x, GIT_ALPHA))
 814                 x = (x & ~0x20) | high;
 815         return x;
 816 }
 817
 818 static inline int sane_iscase(int x, int is_lower)
 819 {
 820         if (!sane_istest(x, GIT_ALPHA))
 821                 return 0;
 822
 823         if (is_lower)
 824                 return (x & 0x20) != 0;
 825         else
 826                 return (x & 0x20) == 0;
 827 }
 828
 829 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 830 {
 831         unsigned long ul;
 832         char *p;
 833
 834         errno = 0;
 835         /* negative values would be accepted by strtoul */
 836         if (strchr(s, '-'))
 837                 return -1;
 838         ul = strtoul(s, &p, base);
 839         if (errno || *p || p == s || (unsigned int) ul != ul)
 840                 return -1;
 841         *result = ul;
 842         return 0;
 843 }
 844
 845 static inline int strtol_i(char const *s, int base, int *result)
 846 {
 847         long ul;
 848         char *p;
 849
 850         errno = 0;
 851         ul = strtol(s, &p, base);
 852         if (errno || *p || p == s || (int) ul != ul)
 853                 return -1;
 854         *result = ul;
 855         return 0;
 856 }
 857
 858 #ifdef INTERNAL_QSORT
 859 void git_qsort(void *base, size_t nmemb, size_t size,
 860                int(*compar)(const void *, const void *));
 861 #define qsort git_qsort
 862 #endif
 863
 864 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 865 # define FORCE_DIR_SET_GID S_ISGID
 866 #else
 867 # define FORCE_DIR_SET_GID 0
 868 #endif
 869
 870 #ifdef NO_NSEC
 871 #undef USE_NSEC
 872 #define ST_CTIME_NSEC(st) 0
 873 #define ST_MTIME_NSEC(st) 0
 874 #else
 875 #ifdef USE_ST_TIMESPEC
 876 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 877 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 878 #else
 879 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 880 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 881 #endif
 882 #endif
 883
 884 #ifdef UNRELIABLE_FSTAT
 885 #define fstat_is_reliable() 0
 886 #else
 887 #define fstat_is_reliable() 1
 888 #endif
 889
 890 #ifndef va_copy
 891 /*
 892  * Since an obvious implementation of va_list would be to make it a
 893  * pointer into the stack frame, a simple assignment will work on
 894  * many systems.  But let's try to be more portable.
 895  */
 896 #ifdef __va_copy
 897 #define va_copy(dst, src) __va_copy(dst, src)
 898 #else
 899 #define va_copy(dst, src) ((dst) = (src))
 900 #endif
 901 #endif
 902
 903 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 904 #define HAVE_VARIADIC_MACROS 1
 905 #endif
 906
 907 /*
 908  * Preserves errno, prints a message, but gives no warning for ENOENT.
 909  * Returns 0 on success, which includes trying to unlink an object that does
 910  * not exist.
 911  */
 912 int unlink_or_warn(const char *path);
 913  /*
 914   * Tries to unlink file.  Returns 0 if unlink succeeded
 915   * or the file already didn't exist.  Returns -1 and
 916   * appends a message to err suitable for
 917   * 'error("%s", err->buf)' on error.
 918   */
 919 int unlink_or_msg(const char *file, struct strbuf *err);
 920 /*
 921  * Preserves errno, prints a message, but gives no warning for ENOENT.
 922  * Returns 0 on success, which includes trying to remove a directory that does
 923  * not exist.
 924  */
 925 int rmdir_or_warn(const char *path);
 926 /*
 927  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 928  * the supplied file mode.
 929  */
 930 int remove_or_warn(unsigned int mode, const char *path);
 931
 932 /*
 933  * Call access(2), but warn for any error except "missing file"
 934  * (ENOENT or ENOTDIR).
 935  */
 936 #define ACCESS_EACCES_OK (1U << 0)
 937 int access_or_warn(const char *path, int mode, unsigned flag);
 938 int access_or_die(const char *path, int mode, unsigned flag);
 939
 940 /* Warn on an inaccessible file that ought to be accessible */
 941 void warn_on_inaccessible(const char *path);
 942
 943 #ifdef GMTIME_UNRELIABLE_ERRORS
 944 struct tm *git_gmtime(const time_t *);
 945 struct tm *git_gmtime_r(const time_t *, struct tm *);
 946 #define gmtime git_gmtime
 947 #define gmtime_r git_gmtime_r
 948 #endif
 949
 950 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 951 #define USE_PARENS_AROUND_GETTEXT_N 1
 952 #endif
 953
 954 #ifndef SHELL_PATH
 955 # define SHELL_PATH "/bin/sh"
 956 #endif
 957
 958 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 959 #define flockfile(fh)
 960 #define funlockfile(fh)
 961 #define getc_unlocked(fh) getc(fh)
 962 #endif
 963
 964 #endif