git-compat-util.h

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