git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #ifdef USE_MSVC_CRTDBG
   5 /*
   6  * For these to work they must appear very early in each
   7  * file -- before most of the standard header files.
   8  */
   9 #include <stdlib.h>
  10 #include <crtdbg.h>
  11 #endif
  12
  13 #define _FILE_OFFSET_BITS 64
  14
  15
  16 /* Derived from Linux "Features Test Macro" header
  17  * Convenience macros to test the versions of gcc (or
  18  * a compatible compiler).
  19  * Use them like this:
  20  *  #if GIT_GNUC_PREREQ (2,8)
  21  *   ... code requiring gcc 2.8 or later ...
  22  *  #endif
  23 */
  24 #if defined(__GNUC__) && defined(__GNUC_MINOR__)
  25 # define GIT_GNUC_PREREQ(maj, min) \
  26         ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  27 #else
  28  #define GIT_GNUC_PREREQ(maj, min) 0
  29 #endif
  30
  31
  32 #ifndef FLEX_ARRAY
  33 /*
  34  * See if our compiler is known to support flexible array members.
  35  */
  36 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  37 # define FLEX_ARRAY /* empty */
  38 #elif defined(__GNUC__)
  39 # if (__GNUC__ >= 3)
  40 #  define FLEX_ARRAY /* empty */
  41 # else
  42 #  define FLEX_ARRAY 0 /* older GNU extension */
  43 # endif
  44 #endif
  45
  46 /*
  47  * Otherwise, default to safer but a bit wasteful traditional style
  48  */
  49 #ifndef FLEX_ARRAY
  50 # define FLEX_ARRAY 1
  51 #endif
  52 #endif
  53
  54
  55 /*
  56  * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
  57  * @cond: the compile-time condition which must be true.
  58  *
  59  * Your compile will fail if the condition isn't true, or can't be evaluated
  60  * by the compiler.  This can be used in an expression: its value is "0".
  61  *
  62  * Example:
  63  *      #define foo_to_char(foo)                                        \
  64  *               ((char *)(foo)                                         \
  65  *                + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
  66  */
  67 #define BUILD_ASSERT_OR_ZERO(cond) \
  68         (sizeof(char [1 - 2*!(cond)]) - 1)
  69
  70 #if GIT_GNUC_PREREQ(3, 1)
  71  /* &arr[0] degrades to a pointer: a different type from an array */
  72 # define BARF_UNLESS_AN_ARRAY(arr)                                              \
  73         BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
  74                                                            __typeof__(&(arr)[0])))
  75 #else
  76 # define BARF_UNLESS_AN_ARRAY(arr) 0
  77 #endif
  78 /*
  79  * ARRAY_SIZE - get the number of elements in a visible array
  80  * @x: the array whose size you want.
  81  *
  82  * This does not work on pointers, or arrays declared as [], or
  83  * function parameters.  With correct compiler support, such usage
  84  * will cause a build error (see the build_assert_or_zero macro).
  85  */
  86 #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
  87
  88 #define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  89
  90 #define maximum_signed_value_of_type(a) \
  91     (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  92
  93 #define maximum_unsigned_value_of_type(a) \
  94     (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  95
  96 /*
  97  * Signed integer overflow is undefined in C, so here's a helper macro
  98  * to detect if the sum of two integers will overflow.
  99  *
 100  * Requires: a >= 0, typeof(a) equals typeof(b)
 101  */
 102 #define signed_add_overflows(a, b) \
 103     ((b) > maximum_signed_value_of_type(a) - (a))
 104
 105 #define unsigned_add_overflows(a, b) \
 106     ((b) > maximum_unsigned_value_of_type(a) - (a))
 107
 108 /*
 109  * Returns true if the multiplication of "a" and "b" will
 110  * overflow. The types of "a" and "b" must match and must be unsigned.
 111  * Note that this macro evaluates "a" twice!
 112  */
 113 #define unsigned_mult_overflows(a, b) \
 114     ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
 115
 116 #ifdef __GNUC__
 117 #define TYPEOF(x) (__typeof__(x))
 118 #else
 119 #define TYPEOF(x)
 120 #endif
 121
 122 #define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 123 #define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 124
 125 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 126
 127 /* Approximation of the length of the decimal representation of this type. */
 128 #define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 129
 130 #if defined(__sun__)
 131  /*
 132   * On Solaris, when _XOPEN_EXTENDED is set, its header file
 133   * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 134   * setting to say we are XPG5 or XPG6.  Also on Solaris,
 135   * XPG6 programs must be compiled with a c99 compiler, while
 136   * non XPG6 programs must be compiled with a pre-c99 compiler.
 137   */
 138 # if __STDC_VERSION__ - 0 >= 199901L
 139 # define _XOPEN_SOURCE 600
 140 # else
 141 # define _XOPEN_SOURCE 500
 142 # endif
 143 #elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 144       !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 145       !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 146       !defined(__CYGWIN__)
 147 #define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 148 #define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 149 #endif
 150 #define _ALL_SOURCE 1
 151 #define _GNU_SOURCE 1
 152 #define _BSD_SOURCE 1
 153 #define _DEFAULT_SOURCE 1
 154 #define _NETBSD_SOURCE 1
 155 #define _SGI_SOURCE 1
 156
 157 #if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 158 # if !defined(_WIN32_WINNT)
 159 #  define _WIN32_WINNT 0x0600
 160 # endif
 161 #define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 162 #include <winsock2.h>
 163 #include <windows.h>
 164 #define GIT_WINDOWS_NATIVE
 165 #endif
 166
 167 #include <unistd.h>
 168 #include <stdio.h>
 169 #include <sys/stat.h>
 170 #include <fcntl.h>
 171 #include <stddef.h>
 172 #include <stdlib.h>
 173 #include <stdarg.h>
 174 #include <string.h>
 175 #ifdef HAVE_STRINGS_H
 176 #include <strings.h> /* for strcasecmp() */
 177 #endif
 178 #include <errno.h>
 179 #include <limits.h>
 180 #ifdef NEEDS_SYS_PARAM_H
 181 #include <sys/param.h>
 182 #endif
 183 #include <sys/types.h>
 184 #include <dirent.h>
 185 #include <sys/time.h>
 186 #include <time.h>
 187 #include <signal.h>
 188 #include <assert.h>
 189 #include <regex.h>
 190 #include <utime.h>
 191 #include <syslog.h>
 192 #if !defined(NO_POLL_H)
 193 #include <poll.h>
 194 #elif !defined(NO_SYS_POLL_H)
 195 #include <sys/poll.h>
 196 #else
 197 /* Pull the compat stuff */
 198 #include <poll.h>
 199 #endif
 200 #ifdef HAVE_BSD_SYSCTL
 201 #include <sys/sysctl.h>
 202 #endif
 203
 204 #if defined(__CYGWIN__)
 205 #include "compat/win32/path-utils.h"
 206 #endif
 207 #if defined(__MINGW32__)
 208 /* pull in Windows compatibility stuff */
 209 #include "compat/win32/path-utils.h"
 210 #include "compat/mingw.h"
 211 #elif defined(_MSC_VER)
 212 #include "compat/win32/path-utils.h"
 213 #include "compat/msvc.h"
 214 #else
 215 #include <sys/utsname.h>
 216 #include <sys/wait.h>
 217 #include <sys/resource.h>
 218 #include <sys/socket.h>
 219 #include <sys/ioctl.h>
 220 #include <termios.h>
 221 #ifndef NO_SYS_SELECT_H
 222 #include <sys/select.h>
 223 #endif
 224 #include <netinet/in.h>
 225 #include <netinet/tcp.h>
 226 #include <arpa/inet.h>
 227 #include <netdb.h>
 228 #include <pwd.h>
 229 #include <sys/un.h>
 230 #ifndef NO_INTTYPES_H
 231 #include <inttypes.h>
 232 #else
 233 #include <stdint.h>
 234 #endif
 235 #ifdef NO_INTPTR_T
 236 /*
 237  * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
 238  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 239  * while on IP16 and IP16L32 it is "int" (resp. "short")
 240  * Size needs to match (or exceed) 'sizeof(void *)'.
 241  * We can't take "long long" here as not everybody has it.
 242  */
 243 typedef long intptr_t;
 244 typedef unsigned long uintptr_t;
 245 #endif
 246 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 247 #include <grp.h>
 248 #define _ALL_SOURCE 1
 249 #endif
 250
 251 /* used on Mac OS X */
 252 #ifdef PRECOMPOSE_UNICODE
 253 #include "compat/precompose_utf8.h"
 254 #else
 255 #define precompose_str(in,i_nfd2nfc)
 256 #define precompose_argv(c,v)
 257 #define probe_utf8_pathname_composition()
 258 #endif
 259
 260 #ifdef MKDIR_WO_TRAILING_SLASH
 261 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 262 int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 263 #endif
 264
 265 #ifdef NO_STRUCT_ITIMERVAL
 266 struct itimerval {
 267         struct timeval it_interval;
 268         struct timeval it_value;
 269 };
 270 #endif
 271
 272 #ifdef NO_SETITIMER
 273 #define setitimer(which,value,ovalue)
 274 #endif
 275
 276 #ifndef NO_LIBGEN_H
 277 #include <libgen.h>
 278 #else
 279 #define basename gitbasename
 280 char *gitbasename(char *);
 281 #define dirname gitdirname
 282 char *gitdirname(char *);
 283 #endif
 284
 285 #ifndef NO_ICONV
 286 #include <iconv.h>
 287 #endif
 288
 289 #ifndef NO_OPENSSL
 290 #ifdef __APPLE__
 291 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 292 #include <AvailabilityMacros.h>
 293 #undef DEPRECATED_ATTRIBUTE
 294 #define DEPRECATED_ATTRIBUTE
 295 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 296 #endif
 297 #include <openssl/ssl.h>
 298 #include <openssl/err.h>
 299 #endif
 300
 301 #ifdef HAVE_SYSINFO
 302 # include <sys/sysinfo.h>
 303 #endif
 304
 305 /* On most systems <netdb.h> would have given us this, but
 306  * not on some systems (e.g. z/OS).
 307  */
 308 #ifndef NI_MAXHOST
 309 #define NI_MAXHOST 1025
 310 #endif
 311
 312 #ifndef NI_MAXSERV
 313 #define NI_MAXSERV 32
 314 #endif
 315
 316 /* On most systems <limits.h> would have given us this, but
 317  * not on some systems (e.g. GNU/Hurd).
 318  */
 319 #ifndef PATH_MAX
 320 #define PATH_MAX 4096
 321 #endif
 322
 323 #ifndef PRIuMAX
 324 #define PRIuMAX "llu"
 325 #endif
 326
 327 #ifndef SCNuMAX
 328 #define SCNuMAX PRIuMAX
 329 #endif
 330
 331 #ifndef PRIu32
 332 #define PRIu32 "u"
 333 #endif
 334
 335 #ifndef PRIx32
 336 #define PRIx32 "x"
 337 #endif
 338
 339 #ifndef PRIo32
 340 #define PRIo32 "o"
 341 #endif
 342
 343 typedef uintmax_t timestamp_t;
 344 #define PRItime PRIuMAX
 345 #define parse_timestamp strtoumax
 346 #define TIME_MAX UINTMAX_MAX
 347 #define TIME_MIN 0
 348
 349 #ifndef PATH_SEP
 350 #define PATH_SEP ':'
 351 #endif
 352
 353 #ifdef HAVE_PATHS_H
 354 #include <paths.h>
 355 #endif
 356 #ifndef _PATH_DEFPATH
 357 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 358 #endif
 359
 360 #ifndef platform_core_config
 361 static inline int noop_core_config(const char *var, const char *value, void *cb)
 362 {
 363         return 0;
 364 }
 365 #define platform_core_config noop_core_config
 366 #endif
 367
 368 #ifndef has_dos_drive_prefix
 369 static inline int git_has_dos_drive_prefix(const char *path)
 370 {
 371         return 0;
 372 }
 373 #define has_dos_drive_prefix git_has_dos_drive_prefix
 374 #endif
 375
 376 #ifndef skip_dos_drive_prefix
 377 static inline int git_skip_dos_drive_prefix(char **path)
 378 {
 379         return 0;
 380 }
 381 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
 382 #endif
 383
 384 #ifndef is_dir_sep
 385 static inline int git_is_dir_sep(int c)
 386 {
 387         return c == '/';
 388 }
 389 #define is_dir_sep git_is_dir_sep
 390 #endif
 391
 392 #ifndef offset_1st_component
 393 static inline int git_offset_1st_component(const char *path)
 394 {
 395         return is_dir_sep(path[0]);
 396 }
 397 #define offset_1st_component git_offset_1st_component
 398 #endif
 399
 400 #ifndef is_valid_path
 401 #define is_valid_path(path) 1
 402 #endif
 403
 404 #ifndef find_last_dir_sep
 405 static inline char *git_find_last_dir_sep(const char *path)
 406 {
 407         return strrchr(path, '/');
 408 }
 409 #define find_last_dir_sep git_find_last_dir_sep
 410 #endif
 411
 412 #ifndef query_user_email
 413 #define query_user_email() NULL
 414 #endif
 415
 416 #ifdef __TANDEM
 417 #include <floss.h(floss_execl,floss_execlp,floss_execv,floss_execvp)>
 418 #include <floss.h(floss_getpwuid)>
 419 #ifndef NSIG
 420 /*
 421  * NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest
 422  * known, by detective work using kill -l as a list is all signals
 423  * instead of signal.h where it should be.
 424  */
 425 # define NSIG 100
 426 #endif
 427 #endif
 428
 429 #if defined(__HP_cc) && (__HP_cc >= 61000)
 430 #define NORETURN __attribute__((noreturn))
 431 #define NORETURN_PTR
 432 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 433 #define NORETURN __attribute__((__noreturn__))
 434 #define NORETURN_PTR __attribute__((__noreturn__))
 435 #elif defined(_MSC_VER)
 436 #define NORETURN __declspec(noreturn)
 437 #define NORETURN_PTR
 438 #else
 439 #define NORETURN
 440 #define NORETURN_PTR
 441 #ifndef __GNUC__
 442 #ifndef __attribute__
 443 #define __attribute__(x)
 444 #endif
 445 #endif
 446 #endif
 447
 448 /* The sentinel attribute is valid from gcc version 4.0 */
 449 #if defined(__GNUC__) && (__GNUC__ >= 4)
 450 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 451 #else
 452 #define LAST_ARG_MUST_BE_NULL
 453 #endif
 454
 455 #define MAYBE_UNUSED __attribute__((__unused__))
 456
 457 #include "compat/bswap.h"
 458
 459 #include "wildmatch.h"
 460
 461 struct strbuf;
 462
 463 /* General helper functions */
 464 void vreportf(const char *prefix, const char *err, va_list params);
 465 NORETURN void usage(const char *err);
 466 NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 467 NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 468 NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 469 int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 470 int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 471 void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 472 void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 473
 474 #ifndef NO_OPENSSL
 475 #ifdef APPLE_COMMON_CRYPTO
 476 #include "compat/apple-common-crypto.h"
 477 #else
 478 #include <openssl/evp.h>
 479 #include <openssl/hmac.h>
 480 #endif /* APPLE_COMMON_CRYPTO */
 481 #include <openssl/x509v3.h>
 482 #endif /* NO_OPENSSL */
 483
 484 /*
 485  * Let callers be aware of the constant return value; this can help
 486  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 487  * because some compilers may not support variadic macros. Since we're only
 488  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 489  * using the function as usual.
 490  */
 491 #if defined(__GNUC__)
 492 static inline int const_error(void)
 493 {
 494         return -1;
 495 }
 496 #define error(...) (error(__VA_ARGS__), const_error())
 497 #define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 498 #endif
 499
 500 void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 501 void set_error_routine(void (*routine)(const char *err, va_list params));
 502 extern void (*get_error_routine(void))(const char *err, va_list params);
 503 void set_warn_routine(void (*routine)(const char *warn, va_list params));
 504 extern void (*get_warn_routine(void))(const char *warn, va_list params);
 505 void set_die_is_recursing_routine(int (*routine)(void));
 506
 507 int starts_with(const char *str, const char *prefix);
 508 int istarts_with(const char *str, const char *prefix);
 509
 510 /*
 511  * If the string "str" begins with the string found in "prefix", return 1.
 512  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 513  * the string right after the prefix).
 514  *
 515  * Otherwise, return 0 and leave "out" untouched.
 516  *
 517  * Examples:
 518  *
 519  *   [extract branch name, fail if not a branch]
 520  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 521  *      return -1;
 522  *
 523  *   [skip prefix if present, otherwise use whole string]
 524  *   skip_prefix(name, "refs/heads/", &name);
 525  */
 526 static inline int skip_prefix(const char *str, const char *prefix,
 527                               const char **out)
 528 {
 529         do {
 530                 if (!*prefix) {
 531                         *out = str;
 532                         return 1;
 533                 }
 534         } while (*str++ == *prefix++);
 535         return 0;
 536 }
 537
 538 /*
 539  * If the string "str" is the same as the string in "prefix", then the "arg"
 540  * parameter is set to the "def" parameter and 1 is returned.
 541  * If the string "str" begins with the string found in "prefix" and then a
 542  * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
 543  * (i.e., to the point in the string right after the prefix and the "=" sign),
 544  * and 1 is returned.
 545  *
 546  * Otherwise, return 0 and leave "arg" untouched.
 547  *
 548  * When we accept both a "--key" and a "--key=<val>" option, this function
 549  * can be used instead of !strcmp(arg, "--key") and then
 550  * skip_prefix(arg, "--key=", &arg) to parse such an option.
 551  */
 552 int skip_to_optional_arg_default(const char *str, const char *prefix,
 553                                  const char **arg, const char *def);
 554
 555 static inline int skip_to_optional_arg(const char *str, const char *prefix,
 556                                        const char **arg)
 557 {
 558         return skip_to_optional_arg_default(str, prefix, arg, "");
 559 }
 560
 561 /*
 562  * Like skip_prefix, but promises never to read past "len" bytes of the input
 563  * buffer, and returns the remaining number of bytes in "out" via "outlen".
 564  */
 565 static inline int skip_prefix_mem(const char *buf, size_t len,
 566                                   const char *prefix,
 567                                   const char **out, size_t *outlen)
 568 {
 569         size_t prefix_len = strlen(prefix);
 570         if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
 571                 *out = buf + prefix_len;
 572                 *outlen = len - prefix_len;
 573                 return 1;
 574         }
 575         return 0;
 576 }
 577
 578 /*
 579  * If buf ends with suffix, return 1 and subtract the length of the suffix
 580  * from *len. Otherwise, return 0 and leave *len untouched.
 581  */
 582 static inline int strip_suffix_mem(const char *buf, size_t *len,
 583                                    const char *suffix)
 584 {
 585         size_t suflen = strlen(suffix);
 586         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 587                 return 0;
 588         *len -= suflen;
 589         return 1;
 590 }
 591
 592 /*
 593  * If str ends with suffix, return 1 and set *len to the size of the string
 594  * without the suffix. Otherwise, return 0 and set *len to the size of the
 595  * string.
 596  *
 597  * Note that we do _not_ NUL-terminate str to the new length.
 598  */
 599 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 600 {
 601         *len = strlen(str);
 602         return strip_suffix_mem(str, len, suffix);
 603 }
 604
 605 static inline int ends_with(const char *str, const char *suffix)
 606 {
 607         size_t len;
 608         return strip_suffix(str, suffix, &len);
 609 }
 610
 611 #define SWAP(a, b) do {                                         \
 612         void *_swap_a_ptr = &(a);                               \
 613         void *_swap_b_ptr = &(b);                               \
 614         unsigned char _swap_buffer[sizeof(a)];                  \
 615         memcpy(_swap_buffer, _swap_a_ptr, sizeof(a));           \
 616         memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) +            \
 617                BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b)));   \
 618         memcpy(_swap_b_ptr, _swap_buffer, sizeof(a));           \
 619 } while (0)
 620
 621 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 622
 623 #ifndef PROT_READ
 624 #define PROT_READ 1
 625 #define PROT_WRITE 2
 626 #define MAP_PRIVATE 1
 627 #endif
 628
 629 #define mmap git_mmap
 630 #define munmap git_munmap
 631 void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 632 int git_munmap(void *start, size_t length);
 633
 634 #else /* NO_MMAP || USE_WIN32_MMAP */
 635
 636 #include <sys/mman.h>
 637
 638 #endif /* NO_MMAP || USE_WIN32_MMAP */
 639
 640 #ifdef NO_MMAP
 641
 642 /* This value must be multiple of (pagesize * 2) */
 643 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 644
 645 #else /* NO_MMAP */
 646
 647 /* This value must be multiple of (pagesize * 2) */
 648 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 649         (sizeof(void*) >= 8 \
 650                 ?  1 * 1024 * 1024 * 1024 \
 651                 : 32 * 1024 * 1024)
 652
 653 #endif /* NO_MMAP */
 654
 655 #ifndef MAP_FAILED
 656 #define MAP_FAILED ((void *)-1)
 657 #endif
 658
 659 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 660 #define on_disk_bytes(st) ((st).st_size)
 661 #else
 662 #define on_disk_bytes(st) ((st).st_blocks * 512)
 663 #endif
 664
 665 #ifdef NEEDS_MODE_TRANSLATION
 666 #undef S_IFMT
 667 #undef S_IFREG
 668 #undef S_IFDIR
 669 #undef S_IFLNK
 670 #undef S_IFBLK
 671 #undef S_IFCHR
 672 #undef S_IFIFO
 673 #undef S_IFSOCK
 674 #define S_IFMT   0170000
 675 #define S_IFREG  0100000
 676 #define S_IFDIR  0040000
 677 #define S_IFLNK  0120000
 678 #define S_IFBLK  0060000
 679 #define S_IFCHR  0020000
 680 #define S_IFIFO  0010000
 681 #define S_IFSOCK 0140000
 682 #ifdef stat
 683 #undef stat
 684 #endif
 685 #define stat(path, buf) git_stat(path, buf)
 686 int git_stat(const char *, struct stat *);
 687 #ifdef fstat
 688 #undef fstat
 689 #endif
 690 #define fstat(fd, buf) git_fstat(fd, buf)
 691 int git_fstat(int, struct stat *);
 692 #ifdef lstat
 693 #undef lstat
 694 #endif
 695 #define lstat(path, buf) git_lstat(path, buf)
 696 int git_lstat(const char *, struct stat *);
 697 #endif
 698
 699 #define DEFAULT_PACKED_GIT_LIMIT \
 700         ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
 701
 702 #ifdef NO_PREAD
 703 #define pread git_pread
 704 ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 705 #endif
 706 /*
 707  * Forward decl that will remind us if its twin in cache.h changes.
 708  * This function is used in compat/pread.c.  But we can't include
 709  * cache.h there.
 710  */
 711 ssize_t read_in_full(int fd, void *buf, size_t count);
 712
 713 #ifdef NO_SETENV
 714 #define setenv gitsetenv
 715 int gitsetenv(const char *, const char *, int);
 716 #endif
 717
 718 #ifdef NO_MKDTEMP
 719 #define mkdtemp gitmkdtemp
 720 char *gitmkdtemp(char *);
 721 #endif
 722
 723 #ifdef NO_UNSETENV
 724 #define unsetenv gitunsetenv
 725 void gitunsetenv(const char *);
 726 #endif
 727
 728 #ifdef NO_STRCASESTR
 729 #define strcasestr gitstrcasestr
 730 char *gitstrcasestr(const char *haystack, const char *needle);
 731 #endif
 732
 733 #ifdef NO_STRLCPY
 734 #define strlcpy gitstrlcpy
 735 size_t gitstrlcpy(char *, const char *, size_t);
 736 #endif
 737
 738 #ifdef NO_STRTOUMAX
 739 #define strtoumax gitstrtoumax
 740 uintmax_t gitstrtoumax(const char *, char **, int);
 741 #define strtoimax gitstrtoimax
 742 intmax_t gitstrtoimax(const char *, char **, int);
 743 #endif
 744
 745 #ifdef NO_HSTRERROR
 746 #define hstrerror githstrerror
 747 const char *githstrerror(int herror);
 748 #endif
 749
 750 #ifdef NO_MEMMEM
 751 #define memmem gitmemmem
 752 void *gitmemmem(const void *haystack, size_t haystacklen,
 753                 const void *needle, size_t needlelen);
 754 #endif
 755
 756 #ifdef OVERRIDE_STRDUP
 757 #ifdef strdup
 758 #undef strdup
 759 #endif
 760 #define strdup gitstrdup
 761 char *gitstrdup(const char *s);
 762 #endif
 763
 764 #ifdef NO_GETPAGESIZE
 765 #define getpagesize() sysconf(_SC_PAGESIZE)
 766 #endif
 767
 768 #ifndef O_CLOEXEC
 769 #define O_CLOEXEC 0
 770 #endif
 771
 772 #ifdef FREAD_READS_DIRECTORIES
 773 # if !defined(SUPPRESS_FOPEN_REDEFINITION)
 774 #  ifdef fopen
 775 #   undef fopen
 776 #  endif
 777 #  define fopen(a,b) git_fopen(a,b)
 778 # endif
 779 FILE *git_fopen(const char*, const char*);
 780 #endif
 781
 782 #ifdef SNPRINTF_RETURNS_BOGUS
 783 #ifdef snprintf
 784 #undef snprintf
 785 #endif
 786 #define snprintf git_snprintf
 787 int git_snprintf(char *str, size_t maxsize,
 788                  const char *format, ...);
 789 #ifdef vsnprintf
 790 #undef vsnprintf
 791 #endif
 792 #define vsnprintf git_vsnprintf
 793 int git_vsnprintf(char *str, size_t maxsize,
 794                   const char *format, va_list ap);
 795 #endif
 796
 797 #ifdef __GLIBC_PREREQ
 798 #if __GLIBC_PREREQ(2, 1)
 799 #define HAVE_STRCHRNUL
 800 #endif
 801 #endif
 802
 803 #ifndef HAVE_STRCHRNUL
 804 #define strchrnul gitstrchrnul
 805 static inline char *gitstrchrnul(const char *s, int c)
 806 {
 807         while (*s && *s != c)
 808                 s++;
 809         return (char *)s;
 810 }
 811 #endif
 812
 813 #ifdef NO_INET_PTON
 814 int inet_pton(int af, const char *src, void *dst);
 815 #endif
 816
 817 #ifdef NO_INET_NTOP
 818 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 819 #endif
 820
 821 #ifdef NO_PTHREADS
 822 #define atexit git_atexit
 823 int git_atexit(void (*handler)(void));
 824 #endif
 825
 826 static inline size_t st_add(size_t a, size_t b)
 827 {
 828         if (unsigned_add_overflows(a, b))
 829                 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 830                     (uintmax_t)a, (uintmax_t)b);
 831         return a + b;
 832 }
 833 #define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 834 #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 835
 836 static inline size_t st_mult(size_t a, size_t b)
 837 {
 838         if (unsigned_mult_overflows(a, b))
 839                 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 840                     (uintmax_t)a, (uintmax_t)b);
 841         return a * b;
 842 }
 843
 844 static inline size_t st_sub(size_t a, size_t b)
 845 {
 846         if (a < b)
 847                 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 848                     (uintmax_t)a, (uintmax_t)b);
 849         return a - b;
 850 }
 851
 852 #ifdef HAVE_ALLOCA_H
 853 # include <alloca.h>
 854 # define xalloca(size)      (alloca(size))
 855 # define xalloca_free(p)    do {} while (0)
 856 #else
 857 # define xalloca(size)      (xmalloc(size))
 858 # define xalloca_free(p)    (free(p))
 859 #endif
 860 char *xstrdup(const char *str);
 861 void *xmalloc(size_t size);
 862 void *xmallocz(size_t size);
 863 void *xmallocz_gently(size_t size);
 864 void *xmemdupz(const void *data, size_t len);
 865 char *xstrndup(const char *str, size_t len);
 866 void *xrealloc(void *ptr, size_t size);
 867 void *xcalloc(size_t nmemb, size_t size);
 868 void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 869 void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 870 int xopen(const char *path, int flags, ...);
 871 ssize_t xread(int fd, void *buf, size_t len);
 872 ssize_t xwrite(int fd, const void *buf, size_t len);
 873 ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 874 int xdup(int fd);
 875 FILE *xfopen(const char *path, const char *mode);
 876 FILE *xfdopen(int fd, const char *mode);
 877 int xmkstemp(char *temp_filename);
 878 int xmkstemp_mode(char *temp_filename, int mode);
 879 char *xgetcwd(void);
 880 FILE *fopen_for_writing(const char *path);
 881 FILE *fopen_or_warn(const char *path, const char *mode);
 882
 883 /*
 884  * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
 885  * that ptr is used twice, so don't pass e.g. ptr++.
 886  */
 887 #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
 888
 889 #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 890 #define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)));
 891 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 892
 893 #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
 894         BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 895 static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
 896 {
 897         if (n)
 898                 memcpy(dst, src, st_mult(size, n));
 899 }
 900
 901 #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
 902         BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 903 static inline void move_array(void *dst, const void *src, size_t n, size_t size)
 904 {
 905         if (n)
 906                 memmove(dst, src, st_mult(size, n));
 907 }
 908
 909 /*
 910  * These functions help you allocate structs with flex arrays, and copy
 911  * the data directly into the array. For example, if you had:
 912  *
 913  *   struct foo {
 914  *     int bar;
 915  *     char name[FLEX_ARRAY];
 916  *   };
 917  *
 918  * you can do:
 919  *
 920  *   struct foo *f;
 921  *   FLEX_ALLOC_MEM(f, name, src, len);
 922  *
 923  * to allocate a "foo" with the contents of "src" in the "name" field.
 924  * The resulting struct is automatically zero'd, and the flex-array field
 925  * is NUL-terminated (whether the incoming src buffer was or not).
 926  *
 927  * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 928  * but do want to store a pointer to some extra data in the same allocated
 929  * block. For example, if you have:
 930  *
 931  *   struct foo {
 932  *     char *name;
 933  *     int bar;
 934  *   };
 935  *
 936  * you can do:
 937  *
 938  *   struct foo *f;
 939  *   FLEXPTR_ALLOC_STR(f, name, src);
 940  *
 941  * and "name" will point to a block of memory after the struct, which will be
 942  * freed along with the struct (but the pointer can be repointed anywhere).
 943  *
 944  * The *_STR variants accept a string parameter rather than a ptr/len
 945  * combination.
 946  *
 947  * Note that these macros will evaluate the first parameter multiple
 948  * times, and it must be assignable as an lvalue.
 949  */
 950 #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 951         size_t flex_array_len_ = (len); \
 952         (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 953         memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
 954 } while (0)
 955 #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 956         size_t flex_array_len_ = (len); \
 957         (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 958         memcpy((x) + 1, (buf), flex_array_len_); \
 959         (x)->ptrname = (void *)((x)+1); \
 960 } while(0)
 961 #define FLEX_ALLOC_STR(x, flexname, str) \
 962         FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 963 #define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 964         FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 965
 966 static inline char *xstrdup_or_null(const char *str)
 967 {
 968         return str ? xstrdup(str) : NULL;
 969 }
 970
 971 static inline size_t xsize_t(off_t len)
 972 {
 973         size_t size = (size_t) len;
 974
 975         if (len != (off_t) size)
 976                 die("Cannot handle files this big");
 977         return size;
 978 }
 979
 980 __attribute__((format (printf, 3, 4)))
 981 int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 982
 983 #ifndef HOST_NAME_MAX
 984 #define HOST_NAME_MAX 256
 985 #endif
 986
 987 int xgethostname(char *buf, size_t len);
 988
 989 /* in ctype.c, for kwset users */
 990 extern const unsigned char tolower_trans_tbl[256];
 991
 992 /* Sane ctype - no locale, and works with signed chars */
 993 #undef isascii
 994 #undef isspace
 995 #undef isdigit
 996 #undef isalpha
 997 #undef isalnum
 998 #undef isprint
 999 #undef islower
1000 #undef isupper
1001 #undef tolower
1002 #undef toupper
1003 #undef iscntrl
1004 #undef ispunct
1005 #undef isxdigit
1006
1007 extern const unsigned char sane_ctype[256];
1008 #define GIT_SPACE 0x01
1009 #define GIT_DIGIT 0x02
1010 #define GIT_ALPHA 0x04
1011 #define GIT_GLOB_SPECIAL 0x08
1012 #define GIT_REGEX_SPECIAL 0x10
1013 #define GIT_PATHSPEC_MAGIC 0x20
1014 #define GIT_CNTRL 0x40
1015 #define GIT_PUNCT 0x80
1016 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
1017 #define isascii(x) (((x) & ~0x7f) == 0)
1018 #define isspace(x) sane_istest(x,GIT_SPACE)
1019 #define isdigit(x) sane_istest(x,GIT_DIGIT)
1020 #define isalpha(x) sane_istest(x,GIT_ALPHA)
1021 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
1022 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
1023 #define islower(x) sane_iscase(x, 1)
1024 #define isupper(x) sane_iscase(x, 0)
1025 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
1026 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
1027 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
1028 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
1029                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
1030 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
1031 #define tolower(x) sane_case((unsigned char)(x), 0x20)
1032 #define toupper(x) sane_case((unsigned char)(x), 0)
1033 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
1034
1035 static inline int sane_case(int x, int high)
1036 {
1037         if (sane_istest(x, GIT_ALPHA))
1038                 x = (x & ~0x20) | high;
1039         return x;
1040 }
1041
1042 static inline int sane_iscase(int x, int is_lower)
1043 {
1044         if (!sane_istest(x, GIT_ALPHA))
1045                 return 0;
1046
1047         if (is_lower)
1048                 return (x & 0x20) != 0;
1049         else
1050                 return (x & 0x20) == 0;
1051 }
1052
1053 /*
1054  * Like skip_prefix, but compare case-insensitively. Note that the comparison
1055  * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1056  * locale-specific conversions).
1057  */
1058 static inline int skip_iprefix(const char *str, const char *prefix,
1059                                const char **out)
1060 {
1061         do {
1062                 if (!*prefix) {
1063                         *out = str;
1064                         return 1;
1065                 }
1066         } while (tolower(*str++) == tolower(*prefix++));
1067         return 0;
1068 }
1069
1070 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1071 {
1072         unsigned long ul;
1073         char *p;
1074
1075         errno = 0;
1076         /* negative values would be accepted by strtoul */
1077         if (strchr(s, '-'))
1078                 return -1;
1079         ul = strtoul(s, &p, base);
1080         if (errno || *p || p == s || (unsigned int) ul != ul)
1081                 return -1;
1082         *result = ul;
1083         return 0;
1084 }
1085
1086 static inline int strtol_i(char const *s, int base, int *result)
1087 {
1088         long ul;
1089         char *p;
1090
1091         errno = 0;
1092         ul = strtol(s, &p, base);
1093         if (errno || *p || p == s || (int) ul != ul)
1094                 return -1;
1095         *result = ul;
1096         return 0;
1097 }
1098
1099 void git_stable_qsort(void *base, size_t nmemb, size_t size,
1100                       int(*compar)(const void *, const void *));
1101 #ifdef INTERNAL_QSORT
1102 #define qsort git_stable_qsort
1103 #endif
1104
1105 #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1106 static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1107                               int(*compar)(const void *, const void *))
1108 {
1109         if (nmemb > 1)
1110                 qsort(base, nmemb, size, compar);
1111 }
1112
1113 #define STABLE_QSORT(base, n, compar) \
1114         git_stable_qsort((base), (n), sizeof(*(base)), compar)
1115
1116 #ifndef HAVE_ISO_QSORT_S
1117 int git_qsort_s(void *base, size_t nmemb, size_t size,
1118                 int (*compar)(const void *, const void *, void *), void *ctx);
1119 #define qsort_s git_qsort_s
1120 #endif
1121
1122 #define QSORT_S(base, n, compar, ctx) do {                      \
1123         if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1124                 BUG("qsort_s() failed");                        \
1125 } while (0)
1126
1127 #ifndef REG_STARTEND
1128 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1129 #endif
1130
1131 static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1132                               size_t nmatch, regmatch_t pmatch[], int eflags)
1133 {
1134         assert(nmatch > 0 && pmatch);
1135         pmatch[0].rm_so = 0;
1136         pmatch[0].rm_eo = size;
1137         return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1138 }
1139
1140 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1141 # define FORCE_DIR_SET_GID S_ISGID
1142 #else
1143 # define FORCE_DIR_SET_GID 0
1144 #endif
1145
1146 #ifdef NO_NSEC
1147 #undef USE_NSEC
1148 #define ST_CTIME_NSEC(st) 0
1149 #define ST_MTIME_NSEC(st) 0
1150 #else
1151 #ifdef USE_ST_TIMESPEC
1152 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1153 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1154 #else
1155 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1156 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1157 #endif
1158 #endif
1159
1160 #ifdef UNRELIABLE_FSTAT
1161 #define fstat_is_reliable() 0
1162 #else
1163 #define fstat_is_reliable() 1
1164 #endif
1165
1166 #ifndef va_copy
1167 /*
1168  * Since an obvious implementation of va_list would be to make it a
1169  * pointer into the stack frame, a simple assignment will work on
1170  * many systems.  But let's try to be more portable.
1171  */
1172 #ifdef __va_copy
1173 #define va_copy(dst, src) __va_copy(dst, src)
1174 #else
1175 #define va_copy(dst, src) ((dst) = (src))
1176 #endif
1177 #endif
1178
1179 #if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1180 #define HAVE_VARIADIC_MACROS 1
1181 #endif
1182
1183 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1184 extern int BUG_exit_code;
1185
1186 #ifdef HAVE_VARIADIC_MACROS
1187 __attribute__((format (printf, 3, 4))) NORETURN
1188 void BUG_fl(const char *file, int line, const char *fmt, ...);
1189 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1190 #else
1191 __attribute__((format (printf, 1, 2))) NORETURN
1192 void BUG(const char *fmt, ...);
1193 #endif
1194
1195 /*
1196  * Preserves errno, prints a message, but gives no warning for ENOENT.
1197  * Returns 0 on success, which includes trying to unlink an object that does
1198  * not exist.
1199  */
1200 int unlink_or_warn(const char *path);
1201  /*
1202   * Tries to unlink file.  Returns 0 if unlink succeeded
1203   * or the file already didn't exist.  Returns -1 and
1204   * appends a message to err suitable for
1205   * 'error("%s", err->buf)' on error.
1206   */
1207 int unlink_or_msg(const char *file, struct strbuf *err);
1208 /*
1209  * Preserves errno, prints a message, but gives no warning for ENOENT.
1210  * Returns 0 on success, which includes trying to remove a directory that does
1211  * not exist.
1212  */
1213 int rmdir_or_warn(const char *path);
1214 /*
1215  * Calls the correct function out of {unlink,rmdir}_or_warn based on
1216  * the supplied file mode.
1217  */
1218 int remove_or_warn(unsigned int mode, const char *path);
1219
1220 /*
1221  * Call access(2), but warn for any error except "missing file"
1222  * (ENOENT or ENOTDIR).
1223  */
1224 #define ACCESS_EACCES_OK (1U << 0)
1225 int access_or_warn(const char *path, int mode, unsigned flag);
1226 int access_or_die(const char *path, int mode, unsigned flag);
1227
1228 /* Warn on an inaccessible file if errno indicates this is an error */
1229 int warn_on_fopen_errors(const char *path);
1230
1231 #ifdef GMTIME_UNRELIABLE_ERRORS
1232 struct tm *git_gmtime(const time_t *);
1233 struct tm *git_gmtime_r(const time_t *, struct tm *);
1234 #define gmtime git_gmtime
1235 #define gmtime_r git_gmtime_r
1236 #endif
1237
1238 #if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1239 #define USE_PARENS_AROUND_GETTEXT_N 1
1240 #endif
1241
1242 #ifndef SHELL_PATH
1243 # define SHELL_PATH "/bin/sh"
1244 #endif
1245
1246 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1247 #define flockfile(fh)
1248 #define funlockfile(fh)
1249 #define getc_unlocked(fh) getc(fh)
1250 #endif
1251
1252 #ifdef FILENO_IS_A_MACRO
1253 int git_fileno(FILE *stream);
1254 # ifndef COMPAT_CODE_FILENO
1255 #  undef fileno
1256 #  define fileno(p) git_fileno(p)
1257 # endif
1258 #endif
1259
1260 #ifdef NEED_ACCESS_ROOT_HANDLER
1261 int git_access(const char *path, int mode);
1262 # ifndef COMPAT_CODE_ACCESS
1263 #  ifdef access
1264 #  undef access
1265 #  endif
1266 #  define access(path, mode) git_access(path, mode)
1267 # endif
1268 #endif
1269
1270 /*
1271  * Our code often opens a path to an optional file, to work on its
1272  * contents when we can successfully open it.  We can ignore a failure
1273  * to open if such an optional file does not exist, but we do want to
1274  * report a failure in opening for other reasons (e.g. we got an I/O
1275  * error, or the file is there, but we lack the permission to open).
1276  *
1277  * Call this function after seeing an error from open() or fopen() to
1278  * see if the errno indicates a missing file that we can safely ignore.
1279  */
1280 static inline int is_missing_file_error(int errno_)
1281 {
1282         return (errno_ == ENOENT || errno_ == ENOTDIR);
1283 }
1284
1285 int cmd_main(int, const char **);
1286
1287 /*
1288  * Intercept all calls to exit() and route them to trace2 to
1289  * optionally emit a message before calling the real exit().
1290  */
1291 int trace2_cmd_exit_fl(const char *file, int line, int code);
1292 #define exit(code) exit(trace2_cmd_exit_fl(__FILE__, __LINE__, (code)))
1293
1294 /*
1295  * You can mark a stack variable with UNLEAK(var) to avoid it being
1296  * reported as a leak by tools like LSAN or valgrind. The argument
1297  * should generally be the variable itself (not its address and not what
1298  * it points to). It's safe to use this on pointers which may already
1299  * have been freed, or on pointers which may still be in use.
1300  *
1301  * Use this _only_ for a variable that leaks by going out of scope at
1302  * program exit (so only from cmd_* functions or their direct helpers).
1303  * Normal functions, especially those which may be called multiple
1304  * times, should actually free their memory. This is only meant as
1305  * an annotation, and does nothing in non-leak-checking builds.
1306  */
1307 #ifdef SUPPRESS_ANNOTATED_LEAKS
1308 void unleak_memory(const void *ptr, size_t len);
1309 #define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1310 #else
1311 #define UNLEAK(var) do {} while (0)
1312 #endif
1313
1314 /*
1315  * This include must come after system headers, since it introduces macros that
1316  * replace system names.
1317  */
1318 #include "banned.h"
1319
1320 /*
1321  * container_of - Get the address of an object containing a field.
1322  *
1323  * @ptr: pointer to the field.
1324  * @type: type of the object.
1325  * @member: name of the field within the object.
1326  */
1327 #define container_of(ptr, type, member) \
1328         ((type *) ((char *)(ptr) - offsetof(type, member)))
1329
1330 /*
1331  * helper function for `container_of_or_null' to avoid multiple
1332  * evaluation of @ptr
1333  */
1334 static inline void *container_of_or_null_offset(void *ptr, size_t offset)
1335 {
1336         return ptr ? (char *)ptr - offset : NULL;
1337 }
1338
1339 /*
1340  * like `container_of', but allows returned value to be NULL
1341  */
1342 #define container_of_or_null(ptr, type, member) \
1343         (type *)container_of_or_null_offset(ptr, offsetof(type, member))
1344
1345 /*
1346  * like offsetof(), but takes a pointer to a a variable of type which
1347  * contains @member, instead of a specified type.
1348  * @ptr is subject to multiple evaluation since we can't rely on __typeof__
1349  * everywhere.
1350  */
1351 #if defined(__GNUC__) /* clang sets this, too */
1352 #define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member)
1353 #else /* !__GNUC__ */
1354 #define OFFSETOF_VAR(ptr, member) \
1355         ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr))
1356 #endif /* !__GNUC__ */
1357
1358 #endif