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/utsname.h>
 193 #include <sys/wait.h>
 194 #include <sys/resource.h>
 195 #include <sys/socket.h>
 196 #include <sys/ioctl.h>
 197 #include <termios.h>
 198 #ifndef NO_SYS_SELECT_H
 199 #include <sys/select.h>
 200 #endif
 201 #include <netinet/in.h>
 202 #include <netinet/tcp.h>
 203 #include <arpa/inet.h>
 204 #include <netdb.h>
 205 #include <pwd.h>
 206 #include <sys/un.h>
 207 #ifndef NO_INTTYPES_H
 208 #include <inttypes.h>
 209 #else
 210 #include <stdint.h>
 211 #endif
 212 #ifdef NO_INTPTR_T
 213 /*
 214  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 215  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 216  * while on IP16 and IP16L32 it is "int" (resp. "short")
 217  * Size needs to match (or exceed) 'sizeof(void *)'.
 218  * We can't take "long long" here as not everybody has it.
 219  */
 220 typedef long intptr_t;
 221 typedef unsigned long uintptr_t;
 222 #endif
 223 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 224 #include <grp.h>
 225 #define _ALL_SOURCE 1
 226 #endif
 227
 228 /* used on Mac OS X */
 229 #ifdef PRECOMPOSE_UNICODE
 230 #include "compat/precompose_utf8.h"
 231 #else
 232 #define precompose_str(in,i_nfd2nfc)
 233 #define precompose_argv(c,v)
 234 #define probe_utf8_pathname_composition(a,b)
 235 #endif
 236
 237 #ifdef MKDIR_WO_TRAILING_SLASH
 238 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 239 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 240 #endif
 241
 242 #ifdef NO_STRUCT_ITIMERVAL
 243 struct itimerval {
 244         struct timeval it_interval;
 245         struct timeval it_value;
 246 };
 247 #endif
 248
 249 #ifdef NO_SETITIMER
 250 #define setitimer(which,value,ovalue)
 251 #endif
 252
 253 #ifndef NO_LIBGEN_H
 254 #include <libgen.h>
 255 #else
 256 #define basename gitbasename
 257 extern char *gitbasename(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 PRIu32
 302 #define PRIu32 "u"
 303 #endif
 304
 305 #ifndef PRIx32
 306 #define PRIx32 "x"
 307 #endif
 308
 309 #ifndef PRIo32
 310 #define PRIo32 "o"
 311 #endif
 312
 313 #ifndef PATH_SEP
 314 #define PATH_SEP ':'
 315 #endif
 316
 317 #ifdef HAVE_PATHS_H
 318 #include <paths.h>
 319 #endif
 320 #ifndef _PATH_DEFPATH
 321 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 322 #endif
 323
 324 #ifndef STRIP_EXTENSION
 325 #define STRIP_EXTENSION ""
 326 #endif
 327
 328 #ifndef has_dos_drive_prefix
 329 static inline int git_has_dos_drive_prefix(const char *path)
 330 {
 331         return 0;
 332 }
 333 #define has_dos_drive_prefix git_has_dos_drive_prefix
 334 #endif
 335
 336 #ifndef is_dir_sep
 337 static inline int git_is_dir_sep(int c)
 338 {
 339         return c == '/';
 340 }
 341 #define is_dir_sep git_is_dir_sep
 342 #endif
 343
 344 #ifndef offset_1st_component
 345 static inline int git_offset_1st_component(const char *path)
 346 {
 347         return is_dir_sep(path[0]);
 348 }
 349 #define offset_1st_component git_offset_1st_component
 350 #endif
 351
 352 #ifndef find_last_dir_sep
 353 static inline char *git_find_last_dir_sep(const char *path)
 354 {
 355         return strrchr(path, '/');
 356 }
 357 #define find_last_dir_sep git_find_last_dir_sep
 358 #endif
 359
 360 #if defined(__HP_cc) && (__HP_cc >= 61000)
 361 #define NORETURN __attribute__((noreturn))
 362 #define NORETURN_PTR
 363 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 364 #define NORETURN __attribute__((__noreturn__))
 365 #define NORETURN_PTR __attribute__((__noreturn__))
 366 #elif defined(_MSC_VER)
 367 #define NORETURN __declspec(noreturn)
 368 #define NORETURN_PTR
 369 #else
 370 #define NORETURN
 371 #define NORETURN_PTR
 372 #ifndef __GNUC__
 373 #ifndef __attribute__
 374 #define __attribute__(x)
 375 #endif
 376 #endif
 377 #endif
 378
 379 /* The sentinel attribute is valid from gcc version 4.0 */
 380 #if defined(__GNUC__) && (__GNUC__ >= 4)
 381 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 382 #else
 383 #define LAST_ARG_MUST_BE_NULL
 384 #endif
 385
 386 #include "compat/bswap.h"
 387
 388 #include "wildmatch.h"
 389
 390 struct strbuf;
 391
 392 /* General helper functions */
 393 extern void vreportf(const char *prefix, const char *err, va_list params);
 394 extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 395 extern NORETURN void usage(const char *err);
 396 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 397 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 398 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 399 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 400 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 401
 402 #ifndef NO_OPENSSL
 403 #ifdef APPLE_COMMON_CRYPTO
 404 #include "compat/apple-common-crypto.h"
 405 #else
 406 #include <openssl/evp.h>
 407 #include <openssl/hmac.h>
 408 #endif /* APPLE_COMMON_CRYPTO */
 409 #include <openssl/x509v3.h>
 410 #endif /* NO_OPENSSL */
 411
 412 /*
 413  * Let callers be aware of the constant return value; this can help
 414  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 415  * because some compilers may not support variadic macros. Since we're only
 416  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 417  * using the function as usual.
 418  */
 419 #if defined(__GNUC__)
 420 static inline int const_error(void)
 421 {
 422         return -1;
 423 }
 424 #define error(...) (error(__VA_ARGS__), const_error())
 425 #endif
 426
 427 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 428 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 429 extern void set_die_is_recursing_routine(int (*routine)(void));
 430
 431 extern int starts_with(const char *str, const char *prefix);
 432
 433 /*
 434  * If the string "str" begins with the string found in "prefix", return 1.
 435  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 436  * the string right after the prefix).
 437  *
 438  * Otherwise, return 0 and leave "out" untouched.
 439  *
 440  * Examples:
 441  *
 442  *   [extract branch name, fail if not a branch]
 443  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 444  *      return -1;
 445  *
 446  *   [skip prefix if present, otherwise use whole string]
 447  *   skip_prefix(name, "refs/heads/", &name);
 448  */
 449 static inline int skip_prefix(const char *str, const char *prefix,
 450                               const char **out)
 451 {
 452         do {
 453                 if (!*prefix) {
 454                         *out = str;
 455                         return 1;
 456                 }
 457         } while (*str++ == *prefix++);
 458         return 0;
 459 }
 460
 461 /*
 462  * If buf ends with suffix, return 1 and subtract the length of the suffix
 463  * from *len. Otherwise, return 0 and leave *len untouched.
 464  */
 465 static inline int strip_suffix_mem(const char *buf, size_t *len,
 466                                    const char *suffix)
 467 {
 468         size_t suflen = strlen(suffix);
 469         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 470                 return 0;
 471         *len -= suflen;
 472         return 1;
 473 }
 474
 475 /*
 476  * If str ends with suffix, return 1 and set *len to the size of the string
 477  * without the suffix. Otherwise, return 0 and set *len to the size of the
 478  * string.
 479  *
 480  * Note that we do _not_ NUL-terminate str to the new length.
 481  */
 482 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 483 {
 484         *len = strlen(str);
 485         return strip_suffix_mem(str, len, suffix);
 486 }
 487
 488 static inline int ends_with(const char *str, const char *suffix)
 489 {
 490         size_t len;
 491         return strip_suffix(str, suffix, &len);
 492 }
 493
 494 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 495
 496 #ifndef PROT_READ
 497 #define PROT_READ 1
 498 #define PROT_WRITE 2
 499 #define MAP_PRIVATE 1
 500 #endif
 501
 502 #define mmap git_mmap
 503 #define munmap git_munmap
 504 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 505 extern int git_munmap(void *start, size_t length);
 506
 507 #else /* NO_MMAP || USE_WIN32_MMAP */
 508
 509 #include <sys/mman.h>
 510
 511 #endif /* NO_MMAP || USE_WIN32_MMAP */
 512
 513 #ifdef NO_MMAP
 514
 515 /* This value must be multiple of (pagesize * 2) */
 516 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 517
 518 #else /* NO_MMAP */
 519
 520 /* This value must be multiple of (pagesize * 2) */
 521 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 522         (sizeof(void*) >= 8 \
 523                 ?  1 * 1024 * 1024 * 1024 \
 524                 : 32 * 1024 * 1024)
 525
 526 #endif /* NO_MMAP */
 527
 528 #ifndef MAP_FAILED
 529 #define MAP_FAILED ((void *)-1)
 530 #endif
 531
 532 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 533 #define on_disk_bytes(st) ((st).st_size)
 534 #else
 535 #define on_disk_bytes(st) ((st).st_blocks * 512)
 536 #endif
 537
 538 #ifdef NEEDS_MODE_TRANSLATION
 539 #undef S_IFMT
 540 #undef S_IFREG
 541 #undef S_IFDIR
 542 #undef S_IFLNK
 543 #undef S_IFBLK
 544 #undef S_IFCHR
 545 #undef S_IFIFO
 546 #undef S_IFSOCK
 547 #define S_IFMT   0170000
 548 #define S_IFREG  0100000
 549 #define S_IFDIR  0040000
 550 #define S_IFLNK  0120000
 551 #define S_IFBLK  0060000
 552 #define S_IFCHR  0020000
 553 #define S_IFIFO  0010000
 554 #define S_IFSOCK 0140000
 555 #ifdef stat
 556 #undef stat
 557 #endif
 558 #define stat(path, buf) git_stat(path, buf)
 559 extern int git_stat(const char *, struct stat *);
 560 #ifdef fstat
 561 #undef fstat
 562 #endif
 563 #define fstat(fd, buf) git_fstat(fd, buf)
 564 extern int git_fstat(int, struct stat *);
 565 #ifdef lstat
 566 #undef lstat
 567 #endif
 568 #define lstat(path, buf) git_lstat(path, buf)
 569 extern int git_lstat(const char *, struct stat *);
 570 #endif
 571
 572 #define DEFAULT_PACKED_GIT_LIMIT \
 573         ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 574
 575 #ifdef NO_PREAD
 576 #define pread git_pread
 577 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 578 #endif
 579 /*
 580  * Forward decl that will remind us if its twin in cache.h changes.
 581  * This function is used in compat/pread.c.  But we can't include
 582  * cache.h there.
 583  */
 584 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 585
 586 #ifdef NO_SETENV
 587 #define setenv gitsetenv
 588 extern int gitsetenv(const char *, const char *, int);
 589 #endif
 590
 591 #ifdef NO_MKDTEMP
 592 #define mkdtemp gitmkdtemp
 593 extern char *gitmkdtemp(char *);
 594 #endif
 595
 596 #ifdef NO_MKSTEMPS
 597 #define mkstemps gitmkstemps
 598 extern int gitmkstemps(char *, int);
 599 #endif
 600
 601 #ifdef NO_UNSETENV
 602 #define unsetenv gitunsetenv
 603 extern void gitunsetenv(const char *);
 604 #endif
 605
 606 #ifdef NO_STRCASESTR
 607 #define strcasestr gitstrcasestr
 608 extern char *gitstrcasestr(const char *haystack, const char *needle);
 609 #endif
 610
 611 #ifdef NO_STRLCPY
 612 #define strlcpy gitstrlcpy
 613 extern size_t gitstrlcpy(char *, const char *, size_t);
 614 #endif
 615
 616 #ifdef NO_STRTOUMAX
 617 #define strtoumax gitstrtoumax
 618 extern uintmax_t gitstrtoumax(const char *, char **, int);
 619 #define strtoimax gitstrtoimax
 620 extern intmax_t gitstrtoimax(const char *, char **, int);
 621 #endif
 622
 623 #ifdef NO_HSTRERROR
 624 #define hstrerror githstrerror
 625 extern const char *githstrerror(int herror);
 626 #endif
 627
 628 #ifdef NO_MEMMEM
 629 #define memmem gitmemmem
 630 void *gitmemmem(const void *haystack, size_t haystacklen,
 631                 const void *needle, size_t needlelen);
 632 #endif
 633
 634 #ifdef NO_GETPAGESIZE
 635 #define getpagesize() sysconf(_SC_PAGESIZE)
 636 #endif
 637
 638 #ifdef FREAD_READS_DIRECTORIES
 639 #ifdef fopen
 640 #undef fopen
 641 #endif
 642 #define fopen(a,b) git_fopen(a,b)
 643 extern FILE *git_fopen(const char*, const char*);
 644 #endif
 645
 646 #ifdef SNPRINTF_RETURNS_BOGUS
 647 #ifdef snprintf
 648 #undef snprintf
 649 #endif
 650 #define snprintf git_snprintf
 651 extern int git_snprintf(char *str, size_t maxsize,
 652                         const char *format, ...);
 653 #ifdef vsnprintf
 654 #undef vsnprintf
 655 #endif
 656 #define vsnprintf git_vsnprintf
 657 extern int git_vsnprintf(char *str, size_t maxsize,
 658                          const char *format, va_list ap);
 659 #endif
 660
 661 #ifdef __GLIBC_PREREQ
 662 #if __GLIBC_PREREQ(2, 1)
 663 #define HAVE_STRCHRNUL
 664 #define HAVE_MEMPCPY
 665 #endif
 666 #endif
 667
 668 #ifndef HAVE_STRCHRNUL
 669 #define strchrnul gitstrchrnul
 670 static inline char *gitstrchrnul(const char *s, int c)
 671 {
 672         while (*s && *s != c)
 673                 s++;
 674         return (char *)s;
 675 }
 676 #endif
 677
 678 #ifndef HAVE_MEMPCPY
 679 #define mempcpy gitmempcpy
 680 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 681 {
 682         return (char *)memcpy(dest, src, n) + n;
 683 }
 684 #endif
 685
 686 #ifdef NO_INET_PTON
 687 int inet_pton(int af, const char *src, void *dst);
 688 #endif
 689
 690 #ifdef NO_INET_NTOP
 691 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 692 #endif
 693
 694 #ifdef NO_PTHREADS
 695 #define atexit git_atexit
 696 extern int git_atexit(void (*handler)(void));
 697 #endif
 698
 699 extern void release_pack_memory(size_t);
 700
 701 typedef void (*try_to_free_t)(size_t);
 702 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 703
 704 #ifdef HAVE_ALLOCA_H
 705 # include <alloca.h>
 706 # define xalloca(size)      (alloca(size))
 707 # define xalloca_free(p)    do {} while (0)
 708 #else
 709 # define xalloca(size)      (xmalloc(size))
 710 # define xalloca_free(p)    (free(p))
 711 #endif
 712 extern char *xstrdup(const char *str);
 713 extern void *xmalloc(size_t size);
 714 extern void *xmallocz(size_t size);
 715 extern void *xmallocz_gently(size_t size);
 716 extern void *xmemdupz(const void *data, size_t len);
 717 extern char *xstrndup(const char *str, size_t len);
 718 extern void *xrealloc(void *ptr, size_t size);
 719 extern void *xcalloc(size_t nmemb, size_t size);
 720 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 721 extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 722 extern ssize_t xread(int fd, void *buf, size_t len);
 723 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 724 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 725 extern int xdup(int fd);
 726 extern FILE *xfdopen(int fd, const char *mode);
 727 extern int xmkstemp(char *template);
 728 extern int xmkstemp_mode(char *template, int mode);
 729 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 730 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 731 extern char *xgetcwd(void);
 732
 733 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 734
 735 static inline char *xstrdup_or_null(const char *str)
 736 {
 737         return str ? xstrdup(str) : NULL;
 738 }
 739
 740 static inline size_t xsize_t(off_t len)
 741 {
 742         if (len > (size_t) len)
 743                 die("Cannot handle files this big");
 744         return (size_t)len;
 745 }
 746
 747 /* in ctype.c, for kwset users */
 748 extern const unsigned char tolower_trans_tbl[256];
 749
 750 /* Sane ctype - no locale, and works with signed chars */
 751 #undef isascii
 752 #undef isspace
 753 #undef isdigit
 754 #undef isalpha
 755 #undef isalnum
 756 #undef isprint
 757 #undef islower
 758 #undef isupper
 759 #undef tolower
 760 #undef toupper
 761 #undef iscntrl
 762 #undef ispunct
 763 #undef isxdigit
 764
 765 extern const unsigned char sane_ctype[256];
 766 #define GIT_SPACE 0x01
 767 #define GIT_DIGIT 0x02
 768 #define GIT_ALPHA 0x04
 769 #define GIT_GLOB_SPECIAL 0x08
 770 #define GIT_REGEX_SPECIAL 0x10
 771 #define GIT_PATHSPEC_MAGIC 0x20
 772 #define GIT_CNTRL 0x40
 773 #define GIT_PUNCT 0x80
 774 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 775 #define isascii(x) (((x) & ~0x7f) == 0)
 776 #define isspace(x) sane_istest(x,GIT_SPACE)
 777 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 778 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 779 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 780 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 781 #define islower(x) sane_iscase(x, 1)
 782 #define isupper(x) sane_iscase(x, 0)
 783 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 784 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 785 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 786 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 787                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 788 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 789 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 790 #define toupper(x) sane_case((unsigned char)(x), 0)
 791 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 792
 793 static inline int sane_case(int x, int high)
 794 {
 795         if (sane_istest(x, GIT_ALPHA))
 796                 x = (x & ~0x20) | high;
 797         return x;
 798 }
 799
 800 static inline int sane_iscase(int x, int is_lower)
 801 {
 802         if (!sane_istest(x, GIT_ALPHA))
 803                 return 0;
 804
 805         if (is_lower)
 806                 return (x & 0x20) != 0;
 807         else
 808                 return (x & 0x20) == 0;
 809 }
 810
 811 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 812 {
 813         unsigned long ul;
 814         char *p;
 815
 816         errno = 0;
 817         ul = strtoul(s, &p, base);
 818         if (errno || *p || p == s || (unsigned int) ul != ul)
 819                 return -1;
 820         *result = ul;
 821         return 0;
 822 }
 823
 824 static inline int strtol_i(char const *s, int base, int *result)
 825 {
 826         long ul;
 827         char *p;
 828
 829         errno = 0;
 830         ul = strtol(s, &p, base);
 831         if (errno || *p || p == s || (int) ul != ul)
 832                 return -1;
 833         *result = ul;
 834         return 0;
 835 }
 836
 837 #ifdef INTERNAL_QSORT
 838 void git_qsort(void *base, size_t nmemb, size_t size,
 839                int(*compar)(const void *, const void *));
 840 #define qsort git_qsort
 841 #endif
 842
 843 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 844 # define FORCE_DIR_SET_GID S_ISGID
 845 #else
 846 # define FORCE_DIR_SET_GID 0
 847 #endif
 848
 849 #ifdef NO_NSEC
 850 #undef USE_NSEC
 851 #define ST_CTIME_NSEC(st) 0
 852 #define ST_MTIME_NSEC(st) 0
 853 #else
 854 #ifdef USE_ST_TIMESPEC
 855 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 856 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 857 #else
 858 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 859 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 860 #endif
 861 #endif
 862
 863 #ifdef UNRELIABLE_FSTAT
 864 #define fstat_is_reliable() 0
 865 #else
 866 #define fstat_is_reliable() 1
 867 #endif
 868
 869 #ifndef va_copy
 870 /*
 871  * Since an obvious implementation of va_list would be to make it a
 872  * pointer into the stack frame, a simple assignment will work on
 873  * many systems.  But let's try to be more portable.
 874  */
 875 #ifdef __va_copy
 876 #define va_copy(dst, src) __va_copy(dst, src)
 877 #else
 878 #define va_copy(dst, src) ((dst) = (src))
 879 #endif
 880 #endif
 881
 882 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 883 #define HAVE_VARIADIC_MACROS 1
 884 #endif
 885
 886 /*
 887  * Preserves errno, prints a message, but gives no warning for ENOENT.
 888  * Returns 0 on success, which includes trying to unlink an object that does
 889  * not exist.
 890  */
 891 int unlink_or_warn(const char *path);
 892  /*
 893   * Tries to unlink file.  Returns 0 if unlink succeeded
 894   * or the file already didn't exist.  Returns -1 and
 895   * appends a message to err suitable for
 896   * 'error("%s", err->buf)' on error.
 897   */
 898 int unlink_or_msg(const char *file, struct strbuf *err);
 899 /*
 900  * Preserves errno, prints a message, but gives no warning for ENOENT.
 901  * Returns 0 on success, which includes trying to remove a directory that does
 902  * not exist.
 903  */
 904 int rmdir_or_warn(const char *path);
 905 /*
 906  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 907  * the supplied file mode.
 908  */
 909 int remove_or_warn(unsigned int mode, const char *path);
 910
 911 /*
 912  * Call access(2), but warn for any error except "missing file"
 913  * (ENOENT or ENOTDIR).
 914  */
 915 #define ACCESS_EACCES_OK (1U << 0)
 916 int access_or_warn(const char *path, int mode, unsigned flag);
 917 int access_or_die(const char *path, int mode, unsigned flag);
 918
 919 /* Warn on an inaccessible file that ought to be accessible */
 920 void warn_on_inaccessible(const char *path);
 921
 922 /* Get the passwd entry for the UID of the current process. */
 923 struct passwd *xgetpwuid_self(void);
 924
 925 #ifdef GMTIME_UNRELIABLE_ERRORS
 926 struct tm *git_gmtime(const time_t *);
 927 struct tm *git_gmtime_r(const time_t *, struct tm *);
 928 #define gmtime git_gmtime
 929 #define gmtime_r git_gmtime_r
 930 #endif
 931
 932 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 933 #define USE_PARENS_AROUND_GETTEXT_N 1
 934 #endif
 935
 936 #ifndef SHELL_PATH
 937 # define SHELL_PATH "/bin/sh"
 938 #endif
 939
 940 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 941 #define flockfile(fh)
 942 #define funlockfile(fh)
 943 #define getc_unlocked(fh) getc(fh)
 944 #endif
 945
 946 #endif