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