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 #ifndef NO_UNIX_SOCKETS
 164 #include <afunix.h>
 165 #endif
 166 #include <windows.h>
 167 #define GIT_WINDOWS_NATIVE
 168 #endif
 169
 170 #include <unistd.h>
 171 #include <stdio.h>
 172 #include <sys/stat.h>
 173 #include <fcntl.h>
 174 #include <stddef.h>
 175 #include <stdlib.h>
 176 #include <stdarg.h>
 177 #include <string.h>
 178 #ifdef HAVE_STRINGS_H
 179 #include <strings.h> /* for strcasecmp() */
 180 #endif
 181 #include <errno.h>
 182 #include <limits.h>
 183 #ifdef NEEDS_SYS_PARAM_H
 184 #include <sys/param.h>
 185 #endif
 186 #include <sys/types.h>
 187 #include <dirent.h>
 188 #include <sys/time.h>
 189 #include <time.h>
 190 #include <signal.h>
 191 #include <assert.h>
 192 #include <regex.h>
 193 #include <utime.h>
 194 #include <syslog.h>
 195 #if !defined(NO_POLL_H)
 196 #include <poll.h>
 197 #elif !defined(NO_SYS_POLL_H)
 198 #include <sys/poll.h>
 199 #else
 200 /* Pull the compat stuff */
 201 #include <poll.h>
 202 #endif
 203 #ifdef HAVE_BSD_SYSCTL
 204 #include <sys/sysctl.h>
 205 #endif
 206
 207 #if defined(__CYGWIN__)
 208 #include "compat/win32/path-utils.h"
 209 #endif
 210 #if defined(__MINGW32__)
 211 /* pull in Windows compatibility stuff */
 212 #include "compat/win32/path-utils.h"
 213 #include "compat/mingw.h"
 214 #elif defined(_MSC_VER)
 215 #include "compat/win32/path-utils.h"
 216 #include "compat/msvc.h"
 217 #else
 218 #include <sys/utsname.h>
 219 #include <sys/wait.h>
 220 #include <sys/resource.h>
 221 #include <sys/socket.h>
 222 #include <sys/ioctl.h>
 223 #include <termios.h>
 224 #ifndef NO_SYS_SELECT_H
 225 #include <sys/select.h>
 226 #endif
 227 #include <netinet/in.h>
 228 #include <netinet/tcp.h>
 229 #include <arpa/inet.h>
 230 #include <netdb.h>
 231 #include <pwd.h>
 232 #include <sys/un.h>
 233 #ifndef NO_INTTYPES_H
 234 #include <inttypes.h>
 235 #else
 236 #include <stdint.h>
 237 #endif
 238 #ifdef NO_INTPTR_T
 239 /*
 240  * On I16LP32, ILP32 and LP64 "long" is the safe bet, however
 241  * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 242  * while on IP16 and IP16L32 it is "int" (resp. "short")
 243  * Size needs to match (or exceed) 'sizeof(void *)'.
 244  * We can't take "long long" here as not everybody has it.
 245  */
 246 typedef long intptr_t;
 247 typedef unsigned long uintptr_t;
 248 #endif
 249 #undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 250 #include <grp.h>
 251 #define _ALL_SOURCE 1
 252 #endif
 253
 254 /* used on Mac OS X */
 255 #ifdef PRECOMPOSE_UNICODE
 256 #include "compat/precompose_utf8.h"
 257 #else
 258 static inline const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix)
 259 {
 260         return prefix;
 261 }
 262 static inline const char *precompose_string_if_needed(const char *in)
 263 {
 264         return in;
 265 }
 266
 267 #define probe_utf8_pathname_composition()
 268 #endif
 269
 270 #ifdef MKDIR_WO_TRAILING_SLASH
 271 #define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 272 int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 273 #endif
 274
 275 #ifdef NO_STRUCT_ITIMERVAL
 276 struct itimerval {
 277         struct timeval it_interval;
 278         struct timeval it_value;
 279 };
 280 #endif
 281
 282 #ifdef NO_SETITIMER
 283 static inline int setitimer(int which, const struct itimerval *value, struct itimerval *newvalue) {
 284         return 0; /* pretend success */
 285 }
 286 #endif
 287
 288 #ifndef NO_LIBGEN_H
 289 #include <libgen.h>
 290 #else
 291 #define basename gitbasename
 292 char *gitbasename(char *);
 293 #define dirname gitdirname
 294 char *gitdirname(char *);
 295 #endif
 296
 297 #ifndef NO_ICONV
 298 #include <iconv.h>
 299 #endif
 300
 301 #ifndef NO_OPENSSL
 302 #ifdef __APPLE__
 303 #define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 304 #include <AvailabilityMacros.h>
 305 #undef DEPRECATED_ATTRIBUTE
 306 #define DEPRECATED_ATTRIBUTE
 307 #undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 308 #endif
 309 #include <openssl/ssl.h>
 310 #include <openssl/err.h>
 311 #endif
 312
 313 #ifdef HAVE_SYSINFO
 314 # include <sys/sysinfo.h>
 315 #endif
 316
 317 /* On most systems <netdb.h> would have given us this, but
 318  * not on some systems (e.g. z/OS).
 319  */
 320 #ifndef NI_MAXHOST
 321 #define NI_MAXHOST 1025
 322 #endif
 323
 324 #ifndef NI_MAXSERV
 325 #define NI_MAXSERV 32
 326 #endif
 327
 328 /* On most systems <limits.h> would have given us this, but
 329  * not on some systems (e.g. GNU/Hurd).
 330  */
 331 #ifndef PATH_MAX
 332 #define PATH_MAX 4096
 333 #endif
 334
 335 typedef uintmax_t timestamp_t;
 336 #define PRItime PRIuMAX
 337 #define parse_timestamp strtoumax
 338 #define TIME_MAX UINTMAX_MAX
 339 #define TIME_MIN 0
 340
 341 #ifndef PATH_SEP
 342 #define PATH_SEP ':'
 343 #endif
 344
 345 #ifdef HAVE_PATHS_H
 346 #include <paths.h>
 347 #endif
 348 #ifndef _PATH_DEFPATH
 349 #define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 350 #endif
 351
 352 #ifndef platform_core_config
 353 static inline int noop_core_config(const char *var, const char *value, void *cb)
 354 {
 355         return 0;
 356 }
 357 #define platform_core_config noop_core_config
 358 #endif
 359
 360 int lstat_cache_aware_rmdir(const char *path);
 361 #if !defined(__MINGW32__) && !defined(_MSC_VER)
 362 #define rmdir lstat_cache_aware_rmdir
 363 #endif
 364
 365 #ifndef has_dos_drive_prefix
 366 static inline int git_has_dos_drive_prefix(const char *path)
 367 {
 368         return 0;
 369 }
 370 #define has_dos_drive_prefix git_has_dos_drive_prefix
 371 #endif
 372
 373 #ifndef skip_dos_drive_prefix
 374 static inline int git_skip_dos_drive_prefix(char **path)
 375 {
 376         return 0;
 377 }
 378 #define skip_dos_drive_prefix git_skip_dos_drive_prefix
 379 #endif
 380
 381 #ifndef is_dir_sep
 382 static inline int git_is_dir_sep(int c)
 383 {
 384         return c == '/';
 385 }
 386 #define is_dir_sep git_is_dir_sep
 387 #endif
 388
 389 #ifndef offset_1st_component
 390 static inline int git_offset_1st_component(const char *path)
 391 {
 392         return is_dir_sep(path[0]);
 393 }
 394 #define offset_1st_component git_offset_1st_component
 395 #endif
 396
 397 #ifndef is_valid_path
 398 #define is_valid_path(path) 1
 399 #endif
 400
 401 #ifndef find_last_dir_sep
 402 static inline char *git_find_last_dir_sep(const char *path)
 403 {
 404         return strrchr(path, '/');
 405 }
 406 #define find_last_dir_sep git_find_last_dir_sep
 407 #endif
 408
 409 #ifndef has_dir_sep
 410 static inline int git_has_dir_sep(const char *path)
 411 {
 412         return !!strchr(path, '/');
 413 }
 414 #define has_dir_sep(path) git_has_dir_sep(path)
 415 #endif
 416
 417 #ifndef query_user_email
 418 #define query_user_email() NULL
 419 #endif
 420
 421 #ifdef __TANDEM
 422 #include <floss.h(floss_execl,floss_execlp,floss_execv,floss_execvp)>
 423 #include <floss.h(floss_getpwuid)>
 424 #ifndef NSIG
 425 /*
 426  * NonStop NSE and NSX do not provide NSIG. SIGGUARDIAN(99) is the highest
 427  * known, by detective work using kill -l as a list is all signals
 428  * instead of signal.h where it should be.
 429  */
 430 # define NSIG 100
 431 #endif
 432 #endif
 433
 434 #if defined(__HP_cc) && (__HP_cc >= 61000)
 435 #define NORETURN __attribute__((noreturn))
 436 #define NORETURN_PTR
 437 #elif defined(__GNUC__) && !defined(NO_NORETURN)
 438 #define NORETURN __attribute__((__noreturn__))
 439 #define NORETURN_PTR __attribute__((__noreturn__))
 440 #elif defined(_MSC_VER)
 441 #define NORETURN __declspec(noreturn)
 442 #define NORETURN_PTR
 443 #else
 444 #define NORETURN
 445 #define NORETURN_PTR
 446 #ifndef __GNUC__
 447 #ifndef __attribute__
 448 #define __attribute__(x)
 449 #endif
 450 #endif
 451 #endif
 452
 453 /* The sentinel attribute is valid from gcc version 4.0 */
 454 #if defined(__GNUC__) && (__GNUC__ >= 4)
 455 #define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 456 #else
 457 #define LAST_ARG_MUST_BE_NULL
 458 #endif
 459
 460 #define MAYBE_UNUSED __attribute__((__unused__))
 461
 462 #include "compat/bswap.h"
 463
 464 #include "wildmatch.h"
 465
 466 struct strbuf;
 467
 468 /* General helper functions */
 469 void vreportf(const char *prefix, const char *err, va_list params);
 470 NORETURN void usage(const char *err);
 471 NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 472 NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 473 NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 474 int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 475 int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 476 void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 477 void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 478
 479 #ifndef NO_OPENSSL
 480 #ifdef APPLE_COMMON_CRYPTO
 481 #include "compat/apple-common-crypto.h"
 482 #else
 483 #include <openssl/evp.h>
 484 #include <openssl/hmac.h>
 485 #endif /* APPLE_COMMON_CRYPTO */
 486 #include <openssl/x509v3.h>
 487 #endif /* NO_OPENSSL */
 488
 489 /*
 490  * Let callers be aware of the constant return value; this can help
 491  * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 492  * because some compilers may not support variadic macros. Since we're only
 493  * trying to help gcc, anyway, it's OK; other compilers will fall back to
 494  * using the function as usual.
 495  */
 496 #if defined(__GNUC__)
 497 static inline int const_error(void)
 498 {
 499         return -1;
 500 }
 501 #define error(...) (error(__VA_ARGS__), const_error())
 502 #define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 503 #endif
 504
 505 typedef void (*report_fn)(const char *, va_list params);
 506
 507 void set_die_routine(NORETURN_PTR report_fn routine);
 508 void set_error_routine(report_fn routine);
 509 report_fn get_error_routine(void);
 510 void set_warn_routine(report_fn routine);
 511 report_fn get_warn_routine(void);
 512 void set_die_is_recursing_routine(int (*routine)(void));
 513
 514 int starts_with(const char *str, const char *prefix);
 515 int istarts_with(const char *str, const char *prefix);
 516
 517 /*
 518  * If the string "str" begins with the string found in "prefix", return 1.
 519  * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 520  * the string right after the prefix).
 521  *
 522  * Otherwise, return 0 and leave "out" untouched.
 523  *
 524  * Examples:
 525  *
 526  *   [extract branch name, fail if not a branch]
 527  *   if (!skip_prefix(ref, "refs/heads/", &branch)
 528  *      return -1;
 529  *
 530  *   [skip prefix if present, otherwise use whole string]
 531  *   skip_prefix(name, "refs/heads/", &name);
 532  */
 533 static inline int skip_prefix(const char *str, const char *prefix,
 534                               const char **out)
 535 {
 536         do {
 537                 if (!*prefix) {
 538                         *out = str;
 539                         return 1;
 540                 }
 541         } while (*str++ == *prefix++);
 542         return 0;
 543 }
 544
 545 /*
 546  * If the string "str" is the same as the string in "prefix", then the "arg"
 547  * parameter is set to the "def" parameter and 1 is returned.
 548  * If the string "str" begins with the string found in "prefix" and then a
 549  * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
 550  * (i.e., to the point in the string right after the prefix and the "=" sign),
 551  * and 1 is returned.
 552  *
 553  * Otherwise, return 0 and leave "arg" untouched.
 554  *
 555  * When we accept both a "--key" and a "--key=<val>" option, this function
 556  * can be used instead of !strcmp(arg, "--key") and then
 557  * skip_prefix(arg, "--key=", &arg) to parse such an option.
 558  */
 559 int skip_to_optional_arg_default(const char *str, const char *prefix,
 560                                  const char **arg, const char *def);
 561
 562 static inline int skip_to_optional_arg(const char *str, const char *prefix,
 563                                        const char **arg)
 564 {
 565         return skip_to_optional_arg_default(str, prefix, arg, "");
 566 }
 567
 568 /*
 569  * Like skip_prefix, but promises never to read past "len" bytes of the input
 570  * buffer, and returns the remaining number of bytes in "out" via "outlen".
 571  */
 572 static inline int skip_prefix_mem(const char *buf, size_t len,
 573                                   const char *prefix,
 574                                   const char **out, size_t *outlen)
 575 {
 576         size_t prefix_len = strlen(prefix);
 577         if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
 578                 *out = buf + prefix_len;
 579                 *outlen = len - prefix_len;
 580                 return 1;
 581         }
 582         return 0;
 583 }
 584
 585 /*
 586  * If buf ends with suffix, return 1 and subtract the length of the suffix
 587  * from *len. Otherwise, return 0 and leave *len untouched.
 588  */
 589 static inline int strip_suffix_mem(const char *buf, size_t *len,
 590                                    const char *suffix)
 591 {
 592         size_t suflen = strlen(suffix);
 593         if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 594                 return 0;
 595         *len -= suflen;
 596         return 1;
 597 }
 598
 599 /*
 600  * If str ends with suffix, return 1 and set *len to the size of the string
 601  * without the suffix. Otherwise, return 0 and set *len to the size of the
 602  * string.
 603  *
 604  * Note that we do _not_ NUL-terminate str to the new length.
 605  */
 606 static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 607 {
 608         *len = strlen(str);
 609         return strip_suffix_mem(str, len, suffix);
 610 }
 611
 612 static inline int ends_with(const char *str, const char *suffix)
 613 {
 614         size_t len;
 615         return strip_suffix(str, suffix, &len);
 616 }
 617
 618 #define SWAP(a, b) do {                                         \
 619         void *_swap_a_ptr = &(a);                               \
 620         void *_swap_b_ptr = &(b);                               \
 621         unsigned char _swap_buffer[sizeof(a)];                  \
 622         memcpy(_swap_buffer, _swap_a_ptr, sizeof(a));           \
 623         memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) +            \
 624                BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b)));   \
 625         memcpy(_swap_b_ptr, _swap_buffer, sizeof(a));           \
 626 } while (0)
 627
 628 #if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 629
 630 #ifndef PROT_READ
 631 #define PROT_READ 1
 632 #define PROT_WRITE 2
 633 #define MAP_PRIVATE 1
 634 #endif
 635
 636 #define mmap git_mmap
 637 #define munmap git_munmap
 638 void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 639 int git_munmap(void *start, size_t length);
 640
 641 #else /* NO_MMAP || USE_WIN32_MMAP */
 642
 643 #include <sys/mman.h>
 644
 645 #endif /* NO_MMAP || USE_WIN32_MMAP */
 646
 647 #ifdef NO_MMAP
 648
 649 /* This value must be multiple of (pagesize * 2) */
 650 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 651
 652 #else /* NO_MMAP */
 653
 654 /* This value must be multiple of (pagesize * 2) */
 655 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 656         (sizeof(void*) >= 8 \
 657                 ?  1 * 1024 * 1024 * 1024 \
 658                 : 32 * 1024 * 1024)
 659
 660 #endif /* NO_MMAP */
 661
 662 #ifndef MAP_FAILED
 663 #define MAP_FAILED ((void *)-1)
 664 #endif
 665
 666 #ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 667 #define on_disk_bytes(st) ((st).st_size)
 668 #else
 669 #define on_disk_bytes(st) ((st).st_blocks * 512)
 670 #endif
 671
 672 #ifdef NEEDS_MODE_TRANSLATION
 673 #undef S_IFMT
 674 #undef S_IFREG
 675 #undef S_IFDIR
 676 #undef S_IFLNK
 677 #undef S_IFBLK
 678 #undef S_IFCHR
 679 #undef S_IFIFO
 680 #undef S_IFSOCK
 681 #define S_IFMT   0170000
 682 #define S_IFREG  0100000
 683 #define S_IFDIR  0040000
 684 #define S_IFLNK  0120000
 685 #define S_IFBLK  0060000
 686 #define S_IFCHR  0020000
 687 #define S_IFIFO  0010000
 688 #define S_IFSOCK 0140000
 689 #ifdef stat
 690 #undef stat
 691 #endif
 692 #define stat(path, buf) git_stat(path, buf)
 693 int git_stat(const char *, struct stat *);
 694 #ifdef fstat
 695 #undef fstat
 696 #endif
 697 #define fstat(fd, buf) git_fstat(fd, buf)
 698 int git_fstat(int, struct stat *);
 699 #ifdef lstat
 700 #undef lstat
 701 #endif
 702 #define lstat(path, buf) git_lstat(path, buf)
 703 int git_lstat(const char *, struct stat *);
 704 #endif
 705
 706 #define DEFAULT_PACKED_GIT_LIMIT \
 707         ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
 708
 709 #ifdef NO_PREAD
 710 #define pread git_pread
 711 ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 712 #endif
 713 /*
 714  * Forward decl that will remind us if its twin in cache.h changes.
 715  * This function is used in compat/pread.c.  But we can't include
 716  * cache.h there.
 717  */
 718 ssize_t read_in_full(int fd, void *buf, size_t count);
 719
 720 #ifdef NO_SETENV
 721 #define setenv gitsetenv
 722 int gitsetenv(const char *, const char *, int);
 723 #endif
 724
 725 #ifdef NO_MKDTEMP
 726 #define mkdtemp gitmkdtemp
 727 char *gitmkdtemp(char *);
 728 #endif
 729
 730 #ifdef NO_UNSETENV
 731 #define unsetenv gitunsetenv
 732 void gitunsetenv(const char *);
 733 #endif
 734
 735 #ifdef NO_STRCASESTR
 736 #define strcasestr gitstrcasestr
 737 char *gitstrcasestr(const char *haystack, const char *needle);
 738 #endif
 739
 740 #ifdef NO_STRLCPY
 741 #define strlcpy gitstrlcpy
 742 size_t gitstrlcpy(char *, const char *, size_t);
 743 #endif
 744
 745 #ifdef NO_STRTOUMAX
 746 #define strtoumax gitstrtoumax
 747 uintmax_t gitstrtoumax(const char *, char **, int);
 748 #define strtoimax gitstrtoimax
 749 intmax_t gitstrtoimax(const char *, char **, int);
 750 #endif
 751
 752 #ifdef NO_HSTRERROR
 753 #define hstrerror githstrerror
 754 const char *githstrerror(int herror);
 755 #endif
 756
 757 #ifdef NO_MEMMEM
 758 #define memmem gitmemmem
 759 void *gitmemmem(const void *haystack, size_t haystacklen,
 760                 const void *needle, size_t needlelen);
 761 #endif
 762
 763 #ifdef OVERRIDE_STRDUP
 764 #ifdef strdup
 765 #undef strdup
 766 #endif
 767 #define strdup gitstrdup
 768 char *gitstrdup(const char *s);
 769 #endif
 770
 771 #ifdef NO_GETPAGESIZE
 772 #define getpagesize() sysconf(_SC_PAGESIZE)
 773 #endif
 774
 775 #ifndef O_CLOEXEC
 776 #define O_CLOEXEC 0
 777 #endif
 778
 779 #ifdef FREAD_READS_DIRECTORIES
 780 # if !defined(SUPPRESS_FOPEN_REDEFINITION)
 781 #  ifdef fopen
 782 #   undef fopen
 783 #  endif
 784 #  define fopen(a,b) git_fopen(a,b)
 785 # endif
 786 FILE *git_fopen(const char*, const char*);
 787 #endif
 788
 789 #ifdef SNPRINTF_RETURNS_BOGUS
 790 #ifdef snprintf
 791 #undef snprintf
 792 #endif
 793 #define snprintf git_snprintf
 794 int git_snprintf(char *str, size_t maxsize,
 795                  const char *format, ...);
 796 #ifdef vsnprintf
 797 #undef vsnprintf
 798 #endif
 799 #define vsnprintf git_vsnprintf
 800 int git_vsnprintf(char *str, size_t maxsize,
 801                   const char *format, va_list ap);
 802 #endif
 803
 804 #ifdef OPEN_RETURNS_EINTR
 805 #undef open
 806 #define open git_open_with_retry
 807 int git_open_with_retry(const char *path, int flag, ...);
 808 #endif
 809
 810 #ifdef __GLIBC_PREREQ
 811 #if __GLIBC_PREREQ(2, 1)
 812 #define HAVE_STRCHRNUL
 813 #endif
 814 #endif
 815
 816 #ifndef HAVE_STRCHRNUL
 817 #define strchrnul gitstrchrnul
 818 static inline char *gitstrchrnul(const char *s, int c)
 819 {
 820         while (*s && *s != c)
 821                 s++;
 822         return (char *)s;
 823 }
 824 #endif
 825
 826 #ifdef NO_INET_PTON
 827 int inet_pton(int af, const char *src, void *dst);
 828 #endif
 829
 830 #ifdef NO_INET_NTOP
 831 const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 832 #endif
 833
 834 #ifdef NO_PTHREADS
 835 #define atexit git_atexit
 836 int git_atexit(void (*handler)(void));
 837 #endif
 838
 839 static inline size_t st_add(size_t a, size_t b)
 840 {
 841         if (unsigned_add_overflows(a, b))
 842                 die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 843                     (uintmax_t)a, (uintmax_t)b);
 844         return a + b;
 845 }
 846 #define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 847 #define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 848
 849 static inline size_t st_mult(size_t a, size_t b)
 850 {
 851         if (unsigned_mult_overflows(a, b))
 852                 die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 853                     (uintmax_t)a, (uintmax_t)b);
 854         return a * b;
 855 }
 856
 857 static inline size_t st_sub(size_t a, size_t b)
 858 {
 859         if (a < b)
 860                 die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 861                     (uintmax_t)a, (uintmax_t)b);
 862         return a - b;
 863 }
 864
 865 #ifdef HAVE_ALLOCA_H
 866 # include <alloca.h>
 867 # define xalloca(size)      (alloca(size))
 868 # define xalloca_free(p)    do {} while (0)
 869 #else
 870 # define xalloca(size)      (xmalloc(size))
 871 # define xalloca_free(p)    (free(p))
 872 #endif
 873 char *xstrdup(const char *str);
 874 void *xmalloc(size_t size);
 875 void *xmallocz(size_t size);
 876 void *xmallocz_gently(size_t size);
 877 void *xmemdupz(const void *data, size_t len);
 878 char *xstrndup(const char *str, size_t len);
 879 void *xrealloc(void *ptr, size_t size);
 880 void *xcalloc(size_t nmemb, size_t size);
 881 void xsetenv(const char *name, const char *value, int overwrite);
 882 void xunsetenv(const char *name);
 883 void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 884 const char *mmap_os_err(void);
 885 void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 886 int xopen(const char *path, int flags, ...);
 887 ssize_t xread(int fd, void *buf, size_t len);
 888 ssize_t xwrite(int fd, const void *buf, size_t len);
 889 ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 890 int xdup(int fd);
 891 FILE *xfopen(const char *path, const char *mode);
 892 FILE *xfdopen(int fd, const char *mode);
 893 int xmkstemp(char *temp_filename);
 894 int xmkstemp_mode(char *temp_filename, int mode);
 895 char *xgetcwd(void);
 896 FILE *fopen_for_writing(const char *path);
 897 FILE *fopen_or_warn(const char *path, const char *mode);
 898
 899 /*
 900  * Like strncmp, but only return zero if s is NUL-terminated and exactly len
 901  * characters long.  If it is not, consider it greater than t.
 902  */
 903 int xstrncmpz(const char *s, const char *t, size_t len);
 904
 905 /*
 906  * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
 907  * that ptr is used twice, so don't pass e.g. ptr++.
 908  */
 909 #define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
 910
 911 #define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 912 #define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)))
 913 #define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 914
 915 #define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
 916         BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 917 static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
 918 {
 919         if (n)
 920                 memcpy(dst, src, st_mult(size, n));
 921 }
 922
 923 #define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
 924         BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 925 static inline void move_array(void *dst, const void *src, size_t n, size_t size)
 926 {
 927         if (n)
 928                 memmove(dst, src, st_mult(size, n));
 929 }
 930
 931 /*
 932  * These functions help you allocate structs with flex arrays, and copy
 933  * the data directly into the array. For example, if you had:
 934  *
 935  *   struct foo {
 936  *     int bar;
 937  *     char name[FLEX_ARRAY];
 938  *   };
 939  *
 940  * you can do:
 941  *
 942  *   struct foo *f;
 943  *   FLEX_ALLOC_MEM(f, name, src, len);
 944  *
 945  * to allocate a "foo" with the contents of "src" in the "name" field.
 946  * The resulting struct is automatically zero'd, and the flex-array field
 947  * is NUL-terminated (whether the incoming src buffer was or not).
 948  *
 949  * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 950  * but do want to store a pointer to some extra data in the same allocated
 951  * block. For example, if you have:
 952  *
 953  *   struct foo {
 954  *     char *name;
 955  *     int bar;
 956  *   };
 957  *
 958  * you can do:
 959  *
 960  *   struct foo *f;
 961  *   FLEXPTR_ALLOC_STR(f, name, src);
 962  *
 963  * and "name" will point to a block of memory after the struct, which will be
 964  * freed along with the struct (but the pointer can be repointed anywhere).
 965  *
 966  * The *_STR variants accept a string parameter rather than a ptr/len
 967  * combination.
 968  *
 969  * Note that these macros will evaluate the first parameter multiple
 970  * times, and it must be assignable as an lvalue.
 971  */
 972 #define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 973         size_t flex_array_len_ = (len); \
 974         (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 975         memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
 976 } while (0)
 977 #define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 978         size_t flex_array_len_ = (len); \
 979         (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 980         memcpy((x) + 1, (buf), flex_array_len_); \
 981         (x)->ptrname = (void *)((x)+1); \
 982 } while(0)
 983 #define FLEX_ALLOC_STR(x, flexname, str) \
 984         FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 985 #define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 986         FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 987
 988 static inline char *xstrdup_or_null(const char *str)
 989 {
 990         return str ? xstrdup(str) : NULL;
 991 }
 992
 993 static inline size_t xsize_t(off_t len)
 994 {
 995         if (len < 0 || (uintmax_t) len > SIZE_MAX)
 996                 die("Cannot handle files this big");
 997         return (size_t) len;
 998 }
 999
1000 __attribute__((format (printf, 3, 4)))
1001 int xsnprintf(char *dst, size_t max, const char *fmt, ...);
1002
1003 #ifndef HOST_NAME_MAX
1004 #define HOST_NAME_MAX 256
1005 #endif
1006
1007 int xgethostname(char *buf, size_t len);
1008
1009 /* in ctype.c, for kwset users */
1010 extern const unsigned char tolower_trans_tbl[256];
1011
1012 /* Sane ctype - no locale, and works with signed chars */
1013 #undef isascii
1014 #undef isspace
1015 #undef isdigit
1016 #undef isalpha
1017 #undef isalnum
1018 #undef isprint
1019 #undef islower
1020 #undef isupper
1021 #undef tolower
1022 #undef toupper
1023 #undef iscntrl
1024 #undef ispunct
1025 #undef isxdigit
1026
1027 extern const unsigned char sane_ctype[256];
1028 #define GIT_SPACE 0x01
1029 #define GIT_DIGIT 0x02
1030 #define GIT_ALPHA 0x04
1031 #define GIT_GLOB_SPECIAL 0x08
1032 #define GIT_REGEX_SPECIAL 0x10
1033 #define GIT_PATHSPEC_MAGIC 0x20
1034 #define GIT_CNTRL 0x40
1035 #define GIT_PUNCT 0x80
1036 #define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
1037 #define isascii(x) (((x) & ~0x7f) == 0)
1038 #define isspace(x) sane_istest(x,GIT_SPACE)
1039 #define isdigit(x) sane_istest(x,GIT_DIGIT)
1040 #define isalpha(x) sane_istest(x,GIT_ALPHA)
1041 #define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
1042 #define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
1043 #define islower(x) sane_iscase(x, 1)
1044 #define isupper(x) sane_iscase(x, 0)
1045 #define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
1046 #define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
1047 #define iscntrl(x) (sane_istest(x,GIT_CNTRL))
1048 #define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
1049                 GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
1050 #define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
1051 #define tolower(x) sane_case((unsigned char)(x), 0x20)
1052 #define toupper(x) sane_case((unsigned char)(x), 0)
1053 #define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
1054
1055 static inline int sane_case(int x, int high)
1056 {
1057         if (sane_istest(x, GIT_ALPHA))
1058                 x = (x & ~0x20) | high;
1059         return x;
1060 }
1061
1062 static inline int sane_iscase(int x, int is_lower)
1063 {
1064         if (!sane_istest(x, GIT_ALPHA))
1065                 return 0;
1066
1067         if (is_lower)
1068                 return (x & 0x20) != 0;
1069         else
1070                 return (x & 0x20) == 0;
1071 }
1072
1073 /*
1074  * Like skip_prefix, but compare case-insensitively. Note that the comparison
1075  * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1076  * locale-specific conversions).
1077  */
1078 static inline int skip_iprefix(const char *str, const char *prefix,
1079                                const char **out)
1080 {
1081         do {
1082                 if (!*prefix) {
1083                         *out = str;
1084                         return 1;
1085                 }
1086         } while (tolower(*str++) == tolower(*prefix++));
1087         return 0;
1088 }
1089
1090 static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1091 {
1092         unsigned long ul;
1093         char *p;
1094
1095         errno = 0;
1096         /* negative values would be accepted by strtoul */
1097         if (strchr(s, '-'))
1098                 return -1;
1099         ul = strtoul(s, &p, base);
1100         if (errno || *p || p == s || (unsigned int) ul != ul)
1101                 return -1;
1102         *result = ul;
1103         return 0;
1104 }
1105
1106 static inline int strtol_i(char const *s, int base, int *result)
1107 {
1108         long ul;
1109         char *p;
1110
1111         errno = 0;
1112         ul = strtol(s, &p, base);
1113         if (errno || *p || p == s || (int) ul != ul)
1114                 return -1;
1115         *result = ul;
1116         return 0;
1117 }
1118
1119 void git_stable_qsort(void *base, size_t nmemb, size_t size,
1120                       int(*compar)(const void *, const void *));
1121 #ifdef INTERNAL_QSORT
1122 #define qsort git_stable_qsort
1123 #endif
1124
1125 #define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1126 static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1127                               int(*compar)(const void *, const void *))
1128 {
1129         if (nmemb > 1)
1130                 qsort(base, nmemb, size, compar);
1131 }
1132
1133 #define STABLE_QSORT(base, n, compar) \
1134         git_stable_qsort((base), (n), sizeof(*(base)), compar)
1135
1136 #ifndef HAVE_ISO_QSORT_S
1137 int git_qsort_s(void *base, size_t nmemb, size_t size,
1138                 int (*compar)(const void *, const void *, void *), void *ctx);
1139 #define qsort_s git_qsort_s
1140 #endif
1141
1142 #define QSORT_S(base, n, compar, ctx) do {                      \
1143         if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1144                 BUG("qsort_s() failed");                        \
1145 } while (0)
1146
1147 #ifndef REG_STARTEND
1148 #error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1149 #endif
1150
1151 static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1152                               size_t nmatch, regmatch_t pmatch[], int eflags)
1153 {
1154         assert(nmatch > 0 && pmatch);
1155         pmatch[0].rm_so = 0;
1156         pmatch[0].rm_eo = size;
1157         return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1158 }
1159
1160 #ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1161 # define FORCE_DIR_SET_GID S_ISGID
1162 #else
1163 # define FORCE_DIR_SET_GID 0
1164 #endif
1165
1166 #ifdef NO_NSEC
1167 #undef USE_NSEC
1168 #define ST_CTIME_NSEC(st) 0
1169 #define ST_MTIME_NSEC(st) 0
1170 #else
1171 #ifdef USE_ST_TIMESPEC
1172 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1173 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1174 #else
1175 #define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1176 #define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1177 #endif
1178 #endif
1179
1180 #ifdef UNRELIABLE_FSTAT
1181 #define fstat_is_reliable() 0
1182 #else
1183 #define fstat_is_reliable() 1
1184 #endif
1185
1186 #ifndef va_copy
1187 /*
1188  * Since an obvious implementation of va_list would be to make it a
1189  * pointer into the stack frame, a simple assignment will work on
1190  * many systems.  But let's try to be more portable.
1191  */
1192 #ifdef __va_copy
1193 #define va_copy(dst, src) __va_copy(dst, src)
1194 #else
1195 #define va_copy(dst, src) ((dst) = (src))
1196 #endif
1197 #endif
1198
1199 /*
1200  * This is always defined as a first step towards making the use of variadic
1201  * macros unconditional. If it causes compilation problems on your platform,
1202  * please report it to the Git mailing list at git@vger.kernel.org.
1203  */
1204 #define HAVE_VARIADIC_MACROS 1
1205
1206 /* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1207 extern int BUG_exit_code;
1208
1209 #ifdef HAVE_VARIADIC_MACROS
1210 __attribute__((format (printf, 3, 4))) NORETURN
1211 void BUG_fl(const char *file, int line, const char *fmt, ...);
1212 #define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1213 #else
1214 __attribute__((format (printf, 1, 2))) NORETURN
1215 void BUG(const char *fmt, ...);
1216 #endif
1217
1218 /*
1219  * Preserves errno, prints a message, but gives no warning for ENOENT.
1220  * Returns 0 on success, which includes trying to unlink an object that does
1221  * not exist.
1222  */
1223 int unlink_or_warn(const char *path);
1224  /*
1225   * Tries to unlink file.  Returns 0 if unlink succeeded
1226   * or the file already didn't exist.  Returns -1 and
1227   * appends a message to err suitable for
1228   * 'error("%s", err->buf)' on error.
1229   */
1230 int unlink_or_msg(const char *file, struct strbuf *err);
1231 /*
1232  * Preserves errno, prints a message, but gives no warning for ENOENT.
1233  * Returns 0 on success, which includes trying to remove a directory that does
1234  * not exist.
1235  */
1236 int rmdir_or_warn(const char *path);
1237 /*
1238  * Calls the correct function out of {unlink,rmdir}_or_warn based on
1239  * the supplied file mode.
1240  */
1241 int remove_or_warn(unsigned int mode, const char *path);
1242
1243 /*
1244  * Call access(2), but warn for any error except "missing file"
1245  * (ENOENT or ENOTDIR).
1246  */
1247 #define ACCESS_EACCES_OK (1U << 0)
1248 int access_or_warn(const char *path, int mode, unsigned flag);
1249 int access_or_die(const char *path, int mode, unsigned flag);
1250
1251 /* Warn on an inaccessible file if errno indicates this is an error */
1252 int warn_on_fopen_errors(const char *path);
1253
1254 /*
1255  * Open with O_NOFOLLOW, or equivalent. Note that the fallback equivalent
1256  * may be racy. Do not use this as protection against an attacker who can
1257  * simultaneously create paths.
1258  */
1259 int open_nofollow(const char *path, int flags);
1260
1261 #ifndef SHELL_PATH
1262 # define SHELL_PATH "/bin/sh"
1263 #endif
1264
1265 #ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1266 static inline void flockfile(FILE *fh)
1267 {
1268         ; /* nothing */
1269 }
1270 static inline void funlockfile(FILE *fh)
1271 {
1272         ; /* nothing */
1273 }
1274 #define getc_unlocked(fh) getc(fh)
1275 #endif
1276
1277 #ifdef FILENO_IS_A_MACRO
1278 int git_fileno(FILE *stream);
1279 # ifndef COMPAT_CODE_FILENO
1280 #  undef fileno
1281 #  define fileno(p) git_fileno(p)
1282 # endif
1283 #endif
1284
1285 #ifdef NEED_ACCESS_ROOT_HANDLER
1286 int git_access(const char *path, int mode);
1287 # ifndef COMPAT_CODE_ACCESS
1288 #  ifdef access
1289 #  undef access
1290 #  endif
1291 #  define access(path, mode) git_access(path, mode)
1292 # endif
1293 #endif
1294
1295 /*
1296  * Our code often opens a path to an optional file, to work on its
1297  * contents when we can successfully open it.  We can ignore a failure
1298  * to open if such an optional file does not exist, but we do want to
1299  * report a failure in opening for other reasons (e.g. we got an I/O
1300  * error, or the file is there, but we lack the permission to open).
1301  *
1302  * Call this function after seeing an error from open() or fopen() to
1303  * see if the errno indicates a missing file that we can safely ignore.
1304  */
1305 static inline int is_missing_file_error(int errno_)
1306 {
1307         return (errno_ == ENOENT || errno_ == ENOTDIR);
1308 }
1309
1310 int cmd_main(int, const char **);
1311
1312 /*
1313  * Intercept all calls to exit() and route them to trace2 to
1314  * optionally emit a message before calling the real exit().
1315  */
1316 int trace2_cmd_exit_fl(const char *file, int line, int code);
1317 #define exit(code) exit(trace2_cmd_exit_fl(__FILE__, __LINE__, (code)))
1318
1319 /*
1320  * You can mark a stack variable with UNLEAK(var) to avoid it being
1321  * reported as a leak by tools like LSAN or valgrind. The argument
1322  * should generally be the variable itself (not its address and not what
1323  * it points to). It's safe to use this on pointers which may already
1324  * have been freed, or on pointers which may still be in use.
1325  *
1326  * Use this _only_ for a variable that leaks by going out of scope at
1327  * program exit (so only from cmd_* functions or their direct helpers).
1328  * Normal functions, especially those which may be called multiple
1329  * times, should actually free their memory. This is only meant as
1330  * an annotation, and does nothing in non-leak-checking builds.
1331  */
1332 #ifdef SUPPRESS_ANNOTATED_LEAKS
1333 void unleak_memory(const void *ptr, size_t len);
1334 #define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1335 #else
1336 #define UNLEAK(var) do {} while (0)
1337 #endif
1338
1339 /*
1340  * This include must come after system headers, since it introduces macros that
1341  * replace system names.
1342  */
1343 #include "banned.h"
1344
1345 /*
1346  * container_of - Get the address of an object containing a field.
1347  *
1348  * @ptr: pointer to the field.
1349  * @type: type of the object.
1350  * @member: name of the field within the object.
1351  */
1352 #define container_of(ptr, type, member) \
1353         ((type *) ((char *)(ptr) - offsetof(type, member)))
1354
1355 /*
1356  * helper function for `container_of_or_null' to avoid multiple
1357  * evaluation of @ptr
1358  */
1359 static inline void *container_of_or_null_offset(void *ptr, size_t offset)
1360 {
1361         return ptr ? (char *)ptr - offset : NULL;
1362 }
1363
1364 /*
1365  * like `container_of', but allows returned value to be NULL
1366  */
1367 #define container_of_or_null(ptr, type, member) \
1368         (type *)container_of_or_null_offset(ptr, offsetof(type, member))
1369
1370 /*
1371  * like offsetof(), but takes a pointer to a variable of type which
1372  * contains @member, instead of a specified type.
1373  * @ptr is subject to multiple evaluation since we can't rely on __typeof__
1374  * everywhere.
1375  */
1376 #if defined(__GNUC__) /* clang sets this, too */
1377 #define OFFSETOF_VAR(ptr, member) offsetof(__typeof__(*ptr), member)
1378 #else /* !__GNUC__ */
1379 #define OFFSETOF_VAR(ptr, member) \
1380         ((uintptr_t)&(ptr)->member - (uintptr_t)(ptr))
1381 #endif /* !__GNUC__ */
1382
1383 void sleep_millisec(int millisec);
1384
1385 #endif