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 /*
 100  * Returns true if the multiplication of "a" and "b" will
 101  * overflow. The types of "a" and "b" must match and must be unsigned.
 102  * Note that this macro evaluates "a" twice!
 103  */
 104 #define unsigned_mult_overflows(a, b) \
 105     ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
 106
 107 #ifdef __GNUC__
 108 #define TYPEOF(x) (__typeof__(x))
 109 #else
 110 #define TYPEOF(x)
 111 #endif
 112
 113 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 114 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 115
 116 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 117
 118 /* Approximation of the length of the decimal representation of this type. */
 119 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 120
 121 #if defined(__sun__)
 122  /*
 123   * On Solaris, when _XOPEN_EXTENDED is set, its header file
 124   * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 125   * setting to say we are XPG5 or XPG6.  Also on Solaris,
 126   * XPG6 programs must be compiled with a c99 compiler, while
 127   * non XPG6 programs must be compiled with a pre-c99 compiler.
 128   */
 129 # if __STDC_VERSION__ - 0 >= 199901L
 130 # define _XOPEN_SOURCE 600
 131 # else
 132 # define _XOPEN_SOURCE 500
 133 # endif
 134 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 135       !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 136       !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 137       !defined(__CYGWIN__)
 138 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 139 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 140 #endif
 141 #define _ALL_SOURCE 1
 142 #define _GNU_SOURCE 1
 143 #define _BSD_SOURCE 1
 144 #define _DEFAULT_SOURCE 1
 145 #define _NETBSD_SOURCE 1
 146 #define _SGI_SOURCE 1
 147
 148 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 149 # if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 150 #  define _WIN32_WINNT 0x0502
 151 # endif
 152 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 153 #include <winsock2.h>
 154 #include <windows.h>
 155 #define GIT_WINDOWS_NATIVE
 156 #endif
 157
 158 #include <unistd.h>
 159 #include <stdio.h>
 160 #include <sys/stat.h>
 161 #include <fcntl.h>
 162 #include <stddef.h>
 163 #include <stdlib.h>
 164 #include <stdarg.h>
 165 #include <string.h>
 166 #ifdef HAVE_STRINGS_H
 167 #include <strings.h> /* for strcasecmp() */
 168 #endif
 169 #include <errno.h>
 170 #include <limits.h>
 171 #ifdef NEEDS_SYS_PARAM_H
 172 #include <sys/param.h>
 173 #endif
 174 #include <sys/types.h>
 175 #include <dirent.h>
 176 #include <sys/time.h>
 177 #include <time.h>
 178 #include <signal.h>
 179 #include <assert.h>
 180 #include <regex.h>
 181 #include <utime.h>
 182 #include <syslog.h>
 183 #ifndef NO_SYS_POLL_H
 184 #include <sys/poll.h>
 185 #else
 186 #include <poll.h>
 187 #endif
 188 #ifdef HAVE_BSD_SYSCTL
 189 #include <sys/sysctl.h>
 190 #endif
 191
 192 #if defined(__MINGW32__)
 193 /* pull in Windows compatibility stuff */
 194 #include "compat/mingw.h"
 195 #elif defined(_MSC_VER)
 196 #include "compat/msvc.h"
 197 #else
 198 #include <sys/utsname.h>
 199 #include <sys/wait.h>
 200 #include <sys/resource.h>
 201 #include <sys/socket.h>
 202 #include <sys/ioctl.h>
 203 #include <termios.h>
 204 #ifndef NO_SYS_SELECT_H
 205 #include <sys/select.h>
 206 #endif
 207 #include <netinet/in.h>
 208 #include <netinet/tcp.h>
 209 #include <arpa/inet.h>
 210 #include <netdb.h>
 211 #include <pwd.h>
 212 #include <sys/un.h>
 213 #ifndef NO_INTTYPES_H
 214 #include <inttypes.h>
 215 #else
 216 #include <stdint.h>
 217 #endif
 218 #ifdef NO_INTPTR_T
 219 /*
 220  * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 221  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 222  * while on IP16 and IP16L32 it is "int" (resp. "short")
 223  * Size needs to match (or exceed) 'sizeof(void *)'.
 224  * We can't take "long long" here as not everybody has it.
 225  */
 226 typedef long intptr_t;
 227 typedef unsigned long uintptr_t;
 228 #endif
 229 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 230 #include <grp.h>
 231 #define _ALL_SOURCE 1
 232 #endif
 233
 234 /* used on Mac OS X */
 235 #ifdef PRECOMPOSE_UNICODE
 236 #include "compat/precompose_utf8.h"
 237 #else
 238 #define precompose_str(in,i_nfd2nfc)
 239 #define precompose_argv(c,v)
 240 #define probe_utf8_pathname_composition(a,b)
 241 #endif
 242
 243 #ifdef MKDIR_WO_TRAILING_SLASH
 244 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 245 extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 246 #endif
 247
 248 #ifdef NO_STRUCT_ITIMERVAL
 249 struct itimerval {
 250         struct timeval it_interval;
 251         struct timeval it_value;
 252 };
 253 #endif
 254
 255 #ifdef NO_SETITIMER
 256 #define setitimer(which,value,ovalue)
 257 #endif
 258
 259 #ifndef NO_LIBGEN_H
 260 #include <libgen.h>
 261 #else
 262 #define basename gitbasename
 263 extern char *gitbasename(char *);
 264 #endif
 265
 266 #ifndef NO_ICONV
 267 #include <iconv.h>
 268 #endif
 269
 270 #ifndef NO_OPENSSL
 271 #ifdef __APPLE__
 272 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 273 #include <AvailabilityMacros.h>
 274 #undef DEPRECATED_ATTRIBUTE
 275 #define DEPRECATED_ATTRIBUTE
 276 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 277 #endif
 278 #include <openssl/ssl.h>
 279 #include <openssl/err.h>
 280 #endif
 281
 282 /* On most systems <netdb.h> would have given us this, but
 283  * not on some systems (e.g. z/OS).
 284  */
 285 #ifndef NI_MAXHOST
 286 #define NI_MAXHOST 1025
 287 #endif
 288
 289 #ifndef NI_MAXSERV
 290 #define NI_MAXSERV 32
 291 #endif
 292
 293 /* On most systems <limits.h> would have given us this, but
 294  * not on some systems (e.g. GNU/Hurd).
 295  */
 296 #ifndef PATH_MAX
 297 #define PATH_MAX 4096
 298 #endif
 299
 300 #ifndef PRIuMAX
 301 #define PRIuMAX "llu"
 302 #endif
 303
 304 #ifndef SCNuMAX
 305 #define SCNuMAX PRIuMAX
 306 #endif
 307
 308 #ifndef PRIu32
 309 #define PRIu32 "u"
 310 #endif
 311
 312 #ifndef PRIx32
 313 #define PRIx32 "x"
 314 #endif
 315
 316 #ifndef PRIo32
 317 #define PRIo32 "o"
 318 #endif
 319
 320 #ifndef PATH_SEP
 321 #define PATH_SEP ':'
 322 #endif
 323
 324 #ifdef HAVE_PATHS_H
 325 #include <paths.h>
 326 #endif
 327 #ifndef _PATH_DEFPATH
 328 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 329 #endif
 330
 331 #ifndef STRIP_EXTENSION
 332 #define STRIP_EXTENSION ""
 333 #endif
 334
 335 #ifndef has_dos_drive_prefix
 336 static inline int git_has_dos_drive_prefix(const char *path)
 337 {
 338         return 0;
 339 }
 340 #define has_dos_drive_prefix git_has_dos_drive_prefix
 341 #endif
 342
 343 #ifndef is_dir_sep
 344 static inline int git_is_dir_sep(int c)
 345 {
 346         return c == '/';
 347 }
 348 #define is_dir_sep git_is_dir_sep
 349 #endif
 350
 351 #ifndef offset_1st_component
 352 static inline int git_offset_1st_component(const char *path)
 353 {
 354         return is_dir_sep(path[0]);
 355 }
 356 #define offset_1st_component git_offset_1st_component
 357 #endif
 358
 359 #ifndef find_last_dir_sep
 360 static inline char *git_find_last_dir_sep(const char *path)
 361 {
 362         return strrchr(path, '/');
 363 }
 364 #define find_last_dir_sep git_find_last_dir_sep
 365 #endif
 366
 367 #if defined(__HP_cc) && (__HP_cc >= 61000)
 368 #define NORETURN __attribute__((noreturn))
 369 #define NORETURN_PTR
 370 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 371 #define NORETURN __attribute__((__noreturn__))
 372 #define NORETURN_PTR __attribute__((__noreturn__))
 373 #elif defined(_MSC_VER)
 374 #define NORETURN __declspec(noreturn)
 375 #define NORETURN_PTR
 376 #else
 377 #define NORETURN
 378 #define NORETURN_PTR
 379 #ifndef __GNUC__
 380 #ifndef __attribute__
 381 #define __attribute__(x)
 382 #endif
 383 #endif
 384 #endif
 385
 386 /* The sentinel attribute is valid from gcc version 4.0 */
 387 #if defined(__GNUC__) && (__GNUC__ >= 4)
 388 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 389 #else
 390 #define LAST_ARG_MUST_BE_NULL
 391 #endif
 392
 393 #include "compat/bswap.h"
 394
 395 #include "wildmatch.h"
 396
 397 struct strbuf;
 398
 399 /* General helper functions */
 400 extern void vreportf(const char *prefix, const char *err, va_list params);
 401 extern NORETURN void usage(const char *err);
 402 extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 403 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 404 extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 405 extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 406 extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 407
 408 #ifndef NO_OPENSSL
 409 #ifdef APPLE_COMMON_CRYPTO
 410 #include "compat/apple-common-crypto.h"
 411 #else
 412 #include <openssl/evp.h>
 413 #include <openssl/hmac.h>
 414 #endif /* APPLE_COMMON_CRYPTO */
 415 #include <openssl/x509v3.h>
 416 #endif /* NO_OPENSSL */
 417
 418 /*
 419  * Let callers be aware of the constant return value; this can help
 420  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 421  * because some compilers may not support variadic macros. Since we're only
 422  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 423  * using the function as usual.
 424  */
 425 #if defined(__GNUC__)
 426 static inline int const_error(void)
 427 {
 428         return -1;
 429 }
 430 #define error(...) (error(__VA_ARGS__), const_error())
 431 #endif
 432
 433 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 434 extern void set_error_routine(void (*routine)(const char *err, va_list params));
 435 extern void set_die_is_recursing_routine(int (*routine)(void));
 436 extern void set_error_handle(FILE *);
 437
 438 extern int starts_with(const char *str, const char *prefix);
 439
 440 /*
 441  * If the string "str" begins with the string found in "prefix", return 1.
 442  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 443  * the string right after the prefix).
 444  *
 445  * Otherwise, return 0 and leave "out" untouched.
 446  *
 447  * Examples:
 448  *
 449  *   [extract branch name, fail if not a branch]
 450  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 451  *      return -1;
 452  *
 453  *   [skip prefix if present, otherwise use whole string]
 454  *   skip_prefix(name, "refs/heads/", &name);
 455  */
 456 static inline int skip_prefix(const char *str, const char *prefix,
 457                               const char **out)
 458 {
 459         do {
 460                 if (!*prefix) {
 461                         *out = str;
 462                         return 1;
 463                 }
 464         } while (*str++ == *prefix++);
 465         return 0;
 466 }
 467
 468 /*
 469  * If buf ends with suffix, return 1 and subtract the length of the suffix
 470  * from *len. Otherwise, return 0 and leave *len untouched.
 471  */
 472 static inline int strip_suffix_mem(const char *buf, size_t *len,
 473                                    const char *suffix)
 474 {
 475         size_t suflen = strlen(suffix);
 476         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 477                 return 0;
 478         *len -= suflen;
 479         return 1;
 480 }
 481
 482 /*
 483  * If str ends with suffix, return 1 and set *len to the size of the string
 484  * without the suffix. Otherwise, return 0 and set *len to the size of the
 485  * string.
 486  *
 487  * Note that we do _not_ NUL-terminate str to the new length.
 488  */
 489 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 490 {
 491         *len = strlen(str);
 492         return strip_suffix_mem(str, len, suffix);
 493 }
 494
 495 static inline int ends_with(const char *str, const char *suffix)
 496 {
 497         size_t len;
 498         return strip_suffix(str, suffix, &len);
 499 }
 500
 501 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 502
 503 #ifndef PROT_READ
 504 #define PROT_READ 1
 505 #define PROT_WRITE 2
 506 #define MAP_PRIVATE 1
 507 #endif
 508
 509 #define mmap git_mmap
 510 #define munmap git_munmap
 511 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 512 extern int git_munmap(void *start, size_t length);
 513
 514 #else /* NO_MMAP || USE_WIN32_MMAP */
 515
 516 #include <sys/mman.h>
 517
 518 #endif /* NO_MMAP || USE_WIN32_MMAP */
 519
 520 #ifdef NO_MMAP
 521
 522 /* This value must be multiple of (pagesize * 2) */
 523 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 524
 525 #else /* NO_MMAP */
 526
 527 /* This value must be multiple of (pagesize * 2) */
 528 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 529         (sizeof(void*) >= 8 \
 530                 ?  1 * 1024 * 1024 * 1024 \
 531                 : 32 * 1024 * 1024)
 532
 533 #endif /* NO_MMAP */
 534
 535 #ifndef MAP_FAILED
 536 #define MAP_FAILED ((void *)-1)
 537 #endif
 538
 539 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 540 #define on_disk_bytes(st) ((st).st_size)
 541 #else
 542 #define on_disk_bytes(st) ((st).st_blocks * 512)
 543 #endif
 544
 545 #ifdef NEEDS_MODE_TRANSLATION
 546 #undef S_IFMT
 547 #undef S_IFREG
 548 #undef S_IFDIR
 549 #undef S_IFLNK
 550 #undef S_IFBLK
 551 #undef S_IFCHR
 552 #undef S_IFIFO
 553 #undef S_IFSOCK
 554 #define S_IFMT   0170000
 555 #define S_IFREG  0100000
 556 #define S_IFDIR  0040000
 557 #define S_IFLNK  0120000
 558 #define S_IFBLK  0060000
 559 #define S_IFCHR  0020000
 560 #define S_IFIFO  0010000
 561 #define S_IFSOCK 0140000
 562 #ifdef stat
 563 #undef stat
 564 #endif
 565 #define stat(path, buf) git_stat(path, buf)
 566 extern int git_stat(const char *, struct stat *);
 567 #ifdef fstat
 568 #undef fstat
 569 #endif
 570 #define fstat(fd, buf) git_fstat(fd, buf)
 571 extern int git_fstat(int, struct stat *);
 572 #ifdef lstat
 573 #undef lstat
 574 #endif
 575 #define lstat(path, buf) git_lstat(path, buf)
 576 extern int git_lstat(const char *, struct stat *);
 577 #endif
 578
 579 #define DEFAULT_PACKED_GIT_LIMIT \
 580         ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 581
 582 #ifdef NO_PREAD
 583 #define pread git_pread
 584 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 585 #endif
 586 /*
 587  * Forward decl that will remind us if its twin in cache.h changes.
 588  * This function is used in compat/pread.c.  But we can't include
 589  * cache.h there.
 590  */
 591 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 592
 593 #ifdef NO_SETENV
 594 #define setenv gitsetenv
 595 extern int gitsetenv(const char *, const char *, int);
 596 #endif
 597
 598 #ifdef NO_MKDTEMP
 599 #define mkdtemp gitmkdtemp
 600 extern char *gitmkdtemp(char *);
 601 #endif
 602
 603 #ifdef NO_MKSTEMPS
 604 #define mkstemps gitmkstemps
 605 extern int gitmkstemps(char *, int);
 606 #endif
 607
 608 #ifdef NO_UNSETENV
 609 #define unsetenv gitunsetenv
 610 extern void gitunsetenv(const char *);
 611 #endif
 612
 613 #ifdef NO_STRCASESTR
 614 #define strcasestr gitstrcasestr
 615 extern char *gitstrcasestr(const char *haystack, const char *needle);
 616 #endif
 617
 618 #ifdef NO_STRLCPY
 619 #define strlcpy gitstrlcpy
 620 extern size_t gitstrlcpy(char *, const char *, size_t);
 621 #endif
 622
 623 #ifdef NO_STRTOUMAX
 624 #define strtoumax gitstrtoumax
 625 extern uintmax_t gitstrtoumax(const char *, char **, int);
 626 #define strtoimax gitstrtoimax
 627 extern intmax_t gitstrtoimax(const char *, char **, int);
 628 #endif
 629
 630 #ifdef NO_HSTRERROR
 631 #define hstrerror githstrerror
 632 extern const char *githstrerror(int herror);
 633 #endif
 634
 635 #ifdef NO_MEMMEM
 636 #define memmem gitmemmem
 637 void *gitmemmem(const void *haystack, size_t haystacklen,
 638                 const void *needle, size_t needlelen);
 639 #endif
 640
 641 #ifdef NO_GETPAGESIZE
 642 #define getpagesize() sysconf(_SC_PAGESIZE)
 643 #endif
 644
 645 #ifdef FREAD_READS_DIRECTORIES
 646 #ifdef fopen
 647 #undef fopen
 648 #endif
 649 #define fopen(a,b) git_fopen(a,b)
 650 extern FILE *git_fopen(const char*, const char*);
 651 #endif
 652
 653 #ifdef SNPRINTF_RETURNS_BOGUS
 654 #ifdef snprintf
 655 #undef snprintf
 656 #endif
 657 #define snprintf git_snprintf
 658 extern int git_snprintf(char *str, size_t maxsize,
 659                         const char *format, ...);
 660 #ifdef vsnprintf
 661 #undef vsnprintf
 662 #endif
 663 #define vsnprintf git_vsnprintf
 664 extern int git_vsnprintf(char *str, size_t maxsize,
 665                          const char *format, va_list ap);
 666 #endif
 667
 668 #ifdef __GLIBC_PREREQ
 669 #if __GLIBC_PREREQ(2, 1)
 670 #define HAVE_STRCHRNUL
 671 #define HAVE_MEMPCPY
 672 #endif
 673 #endif
 674
 675 #ifndef HAVE_STRCHRNUL
 676 #define strchrnul gitstrchrnul
 677 static inline char *gitstrchrnul(const char *s, int c)
 678 {
 679         while (*s && *s != c)
 680                 s++;
 681         return (char *)s;
 682 }
 683 #endif
 684
 685 #ifndef HAVE_MEMPCPY
 686 #define mempcpy gitmempcpy
 687 static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 688 {
 689         return (char *)memcpy(dest, src, n) + n;
 690 }
 691 #endif
 692
 693 #ifdef NO_INET_PTON
 694 int inet_pton(int af, const char *src, void *dst);
 695 #endif
 696
 697 #ifdef NO_INET_NTOP
 698 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 699 #endif
 700
 701 #ifdef NO_PTHREADS
 702 #define atexit git_atexit
 703 extern int git_atexit(void (*handler)(void));
 704 #endif
 705
 706 extern void release_pack_memory(size_t);
 707
 708 typedef void (*try_to_free_t)(size_t);
 709 extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 710
 711 static inline size_t st_add(size_t a, size_t b)
 712 {
 713         if (unsigned_add_overflows(a, b))
 714                 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 715                     (uintmax_t)a, (uintmax_t)b);
 716         return a + b;
 717 }
 718 #define st_add3(a,b,c)   st_add((a),st_add((b),(c)))
 719 #define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
 720
 721 static inline size_t st_mult(size_t a, size_t b)
 722 {
 723         if (unsigned_mult_overflows(a, b))
 724                 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 725                     (uintmax_t)a, (uintmax_t)b);
 726         return a * b;
 727 }
 728
 729 static inline size_t st_sub(size_t a, size_t b)
 730 {
 731         if (a < b)
 732                 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 733                     (uintmax_t)a, (uintmax_t)b);
 734         return a - b;
 735 }
 736
 737 #ifdef HAVE_ALLOCA_H
 738 # include <alloca.h>
 739 # define xalloca(size)      (alloca(size))
 740 # define xalloca_free(p)    do {} while (0)
 741 #else
 742 # define xalloca(size)      (xmalloc(size))
 743 # define xalloca_free(p)    (free(p))
 744 #endif
 745 extern char *xstrdup(const char *str);
 746 extern void *xmalloc(size_t size);
 747 extern void *xmallocz(size_t size);
 748 extern void *xmallocz_gently(size_t size);
 749 extern void *xmemdupz(const void *data, size_t len);
 750 extern char *xstrndup(const char *str, size_t len);
 751 extern void *xrealloc(void *ptr, size_t size);
 752 extern void *xcalloc(size_t nmemb, size_t size);
 753 extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 754 extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 755 extern int xopen(const char *path, int flags, ...);
 756 extern ssize_t xread(int fd, void *buf, size_t len);
 757 extern ssize_t xwrite(int fd, const void *buf, size_t len);
 758 extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 759 extern int xdup(int fd);
 760 extern FILE *xfopen(const char *path, const char *mode);
 761 extern FILE *xfdopen(int fd, const char *mode);
 762 extern int xmkstemp(char *template);
 763 extern int xmkstemp_mode(char *template, int mode);
 764 extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 765 extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 766 extern char *xgetcwd(void);
 767
 768 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 769
 770 static inline char *xstrdup_or_null(const char *str)
 771 {
 772         return str ? xstrdup(str) : NULL;
 773 }
 774
 775 static inline size_t xsize_t(off_t len)
 776 {
 777         if (len > (size_t) len)
 778                 die("Cannot handle files this big");
 779         return (size_t)len;
 780 }
 781
 782 /* in ctype.c, for kwset users */
 783 extern const unsigned char tolower_trans_tbl[256];
 784
 785 /* Sane ctype - no locale, and works with signed chars */
 786 #undef isascii
 787 #undef isspace
 788 #undef isdigit
 789 #undef isalpha
 790 #undef isalnum
 791 #undef isprint
 792 #undef islower
 793 #undef isupper
 794 #undef tolower
 795 #undef toupper
 796 #undef iscntrl
 797 #undef ispunct
 798 #undef isxdigit
 799
 800 extern const unsigned char sane_ctype[256];
 801 #define GIT_SPACE 0x01
 802 #define GIT_DIGIT 0x02
 803 #define GIT_ALPHA 0x04
 804 #define GIT_GLOB_SPECIAL 0x08
 805 #define GIT_REGEX_SPECIAL 0x10
 806 #define GIT_PATHSPEC_MAGIC 0x20
 807 #define GIT_CNTRL 0x40
 808 #define GIT_PUNCT 0x80
 809 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 810 #define isascii(x) (((x) & ~0x7f) == 0)
 811 #define isspace(x) sane_istest(x,GIT_SPACE)
 812 #define isdigit(x) sane_istest(x,GIT_DIGIT)
 813 #define isalpha(x) sane_istest(x,GIT_ALPHA)
 814 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 815 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 816 #define islower(x) sane_iscase(x, 1)
 817 #define isupper(x) sane_iscase(x, 0)
 818 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 819 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 820 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 821 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 822                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 823 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 824 #define tolower(x) sane_case((unsigned char)(x), 0x20)
 825 #define toupper(x) sane_case((unsigned char)(x), 0)
 826 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 827
 828 static inline int sane_case(int x, int high)
 829 {
 830         if (sane_istest(x, GIT_ALPHA))
 831                 x = (x & ~0x20) | high;
 832         return x;
 833 }
 834
 835 static inline int sane_iscase(int x, int is_lower)
 836 {
 837         if (!sane_istest(x, GIT_ALPHA))
 838                 return 0;
 839
 840         if (is_lower)
 841                 return (x & 0x20) != 0;
 842         else
 843                 return (x & 0x20) == 0;
 844 }
 845
 846 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 847 {
 848         unsigned long ul;
 849         char *p;
 850
 851         errno = 0;
 852         ul = strtoul(s, &p, base);
 853         if (errno || *p || p == s || (unsigned int) ul != ul)
 854                 return -1;
 855         *result = ul;
 856         return 0;
 857 }
 858
 859 static inline int strtol_i(char const *s, int base, int *result)
 860 {
 861         long ul;
 862         char *p;
 863
 864         errno = 0;
 865         ul = strtol(s, &p, base);
 866         if (errno || *p || p == s || (int) ul != ul)
 867                 return -1;
 868         *result = ul;
 869         return 0;
 870 }
 871
 872 #ifdef INTERNAL_QSORT
 873 void git_qsort(void *base, size_t nmemb, size_t size,
 874                int(*compar)(const void *, const void *));
 875 #define qsort git_qsort
 876 #endif
 877
 878 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 879 # define FORCE_DIR_SET_GID S_ISGID
 880 #else
 881 # define FORCE_DIR_SET_GID 0
 882 #endif
 883
 884 #ifdef NO_NSEC
 885 #undef USE_NSEC
 886 #define ST_CTIME_NSEC(st) 0
 887 #define ST_MTIME_NSEC(st) 0
 888 #else
 889 #ifdef USE_ST_TIMESPEC
 890 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 891 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 892 #else
 893 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 894 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 895 #endif
 896 #endif
 897
 898 #ifdef UNRELIABLE_FSTAT
 899 #define fstat_is_reliable() 0
 900 #else
 901 #define fstat_is_reliable() 1
 902 #endif
 903
 904 #ifndef va_copy
 905 /*
 906  * Since an obvious implementation of va_list would be to make it a
 907  * pointer into the stack frame, a simple assignment will work on
 908  * many systems.  But let's try to be more portable.
 909  */
 910 #ifdef __va_copy
 911 #define va_copy(dst, src) __va_copy(dst, src)
 912 #else
 913 #define va_copy(dst, src) ((dst) = (src))
 914 #endif
 915 #endif
 916
 917 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 918 #define HAVE_VARIADIC_MACROS 1
 919 #endif
 920
 921 /*
 922  * Preserves errno, prints a message, but gives no warning for ENOENT.
 923  * Returns 0 on success, which includes trying to unlink an object that does
 924  * not exist.
 925  */
 926 int unlink_or_warn(const char *path);
 927  /*
 928   * Tries to unlink file.  Returns 0 if unlink succeeded
 929   * or the file already didn't exist.  Returns -1 and
 930   * appends a message to err suitable for
 931   * 'error("%s", err->buf)' on error.
 932   */
 933 int unlink_or_msg(const char *file, struct strbuf *err);
 934 /*
 935  * Preserves errno, prints a message, but gives no warning for ENOENT.
 936  * Returns 0 on success, which includes trying to remove a directory that does
 937  * not exist.
 938  */
 939 int rmdir_or_warn(const char *path);
 940 /*
 941  * Calls the correct function out of {unlink,rmdir}_or_warn based on
 942  * the supplied file mode.
 943  */
 944 int remove_or_warn(unsigned int mode, const char *path);
 945
 946 /*
 947  * Call access(2), but warn for any error except "missing file"
 948  * (ENOENT or ENOTDIR).
 949  */
 950 #define ACCESS_EACCES_OK (1U << 0)
 951 int access_or_warn(const char *path, int mode, unsigned flag);
 952 int access_or_die(const char *path, int mode, unsigned flag);
 953
 954 /* Warn on an inaccessible file that ought to be accessible */
 955 void warn_on_inaccessible(const char *path);
 956
 957 #ifdef GMTIME_UNRELIABLE_ERRORS
 958 struct tm *git_gmtime(const time_t *);
 959 struct tm *git_gmtime_r(const time_t *, struct tm *);
 960 #define gmtime git_gmtime
 961 #define gmtime_r git_gmtime_r
 962 #endif
 963
 964 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 965 #define USE_PARENS_AROUND_GETTEXT_N 1
 966 #endif
 967
 968 #ifndef SHELL_PATH
 969 # define SHELL_PATH "/bin/sh"
 970 #endif
 971
 972 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 973 #define flockfile(fh)
 974 #define funlockfile(fh)
 975 #define getc_unlocked(fh) getc(fh)
 976 #endif
 977
 978 #endif