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