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