Andrew's git - gitweb.git/blob

   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 */
 233typedef long intptr_t;
 234typedef 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))
 252extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 253#endif
 254
 255#ifdef NO_STRUCT_ITIMERVAL
 256struct 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
 270extern char *gitbasename(char *);
 271#define dirname gitdirname
 272extern 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
 333typedef 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
 350static 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
 358static 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
 366static 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
 374static 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
 382static 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
 390static 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#if defined(__HP_cc) && (__HP_cc >= 61000)
 402#define NORETURN __attribute__((noreturn))
 403#define NORETURN_PTR
 404#elif defined(__GNUC__) && !defined(NO_NORETURN)
 405#define NORETURN __attribute__((__noreturn__))
 406#define NORETURN_PTR __attribute__((__noreturn__))
 407#elif defined(_MSC_VER)
 408#define NORETURN __declspec(noreturn)
 409#define NORETURN_PTR
 410#else
 411#define NORETURN
 412#define NORETURN_PTR
 413#ifndef __GNUC__
 414#ifndef __attribute__
 415#define __attribute__(x)
 416#endif
 417#endif
 418#endif
 419
 420/* The sentinel attribute is valid from gcc version 4.0 */
 421#if defined(__GNUC__) && (__GNUC__ >= 4)
 422#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 423#else
 424#define LAST_ARG_MUST_BE_NULL
 425#endif
 426
 427#define MAYBE_UNUSED __attribute__((__unused__))
 428
 429#include "compat/bswap.h"
 430
 431#include "wildmatch.h"
 432
 433struct strbuf;
 434
 435/* General helper functions */
 436extern void vreportf(const char *prefix, const char *err, va_list params);
 437extern NORETURN void usage(const char *err);
 438extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 439extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 440extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 441extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 442extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 443extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 444extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 445
 446#ifndef NO_OPENSSL
 447#ifdef APPLE_COMMON_CRYPTO
 448#include "compat/apple-common-crypto.h"
 449#else
 450#include <openssl/evp.h>
 451#include <openssl/hmac.h>
 452#endif /* APPLE_COMMON_CRYPTO */
 453#include <openssl/x509v3.h>
 454#endif /* NO_OPENSSL */
 455
 456/*
 457 * Let callers be aware of the constant return value; this can help
 458 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 459 * because some compilers may not support variadic macros. Since we're only
 460 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 461 * using the function as usual.
 462 */
 463#if defined(__GNUC__)
 464static inline int const_error(void)
 465{
 466        return -1;
 467}
 468#define error(...) (error(__VA_ARGS__), const_error())
 469#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 470#endif
 471
 472extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 473extern void set_error_routine(void (*routine)(const char *err, va_list params));
 474extern void (*get_error_routine(void))(const char *err, va_list params);
 475extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 476extern void (*get_warn_routine(void))(const char *warn, va_list params);
 477extern void set_die_is_recursing_routine(int (*routine)(void));
 478
 479extern int starts_with(const char *str, const char *prefix);
 480extern int istarts_with(const char *str, const char *prefix);
 481
 482/*
 483 * If the string "str" begins with the string found in "prefix", return 1.
 484 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 485 * the string right after the prefix).
 486 *
 487 * Otherwise, return 0 and leave "out" untouched.
 488 *
 489 * Examples:
 490 *
 491 *   [extract branch name, fail if not a branch]
 492 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 493 *      return -1;
 494 *
 495 *   [skip prefix if present, otherwise use whole string]
 496 *   skip_prefix(name, "refs/heads/", &name);
 497 */
 498static inline int skip_prefix(const char *str, const char *prefix,
 499                              const char **out)
 500{
 501        do {
 502                if (!*prefix) {
 503                        *out = str;
 504                        return 1;
 505                }
 506        } while (*str++ == *prefix++);
 507        return 0;
 508}
 509
 510/*
 511 * If the string "str" is the same as the string in "prefix", then the "arg"
 512 * parameter is set to the "def" parameter and 1 is returned.
 513 * If the string "str" begins with the string found in "prefix" and then a
 514 * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
 515 * (i.e., to the point in the string right after the prefix and the "=" sign),
 516 * and 1 is returned.
 517 *
 518 * Otherwise, return 0 and leave "arg" untouched.
 519 *
 520 * When we accept both a "--key" and a "--key=<val>" option, this function
 521 * can be used instead of !strcmp(arg, "--key") and then
 522 * skip_prefix(arg, "--key=", &arg) to parse such an option.
 523 */
 524int skip_to_optional_arg_default(const char *str, const char *prefix,
 525                                 const char **arg, const char *def);
 526
 527static inline int skip_to_optional_arg(const char *str, const char *prefix,
 528                                       const char **arg)
 529{
 530        return skip_to_optional_arg_default(str, prefix, arg, "");
 531}
 532
 533/*
 534 * Like skip_prefix, but promises never to read past "len" bytes of the input
 535 * buffer, and returns the remaining number of bytes in "out" via "outlen".
 536 */
 537static inline int skip_prefix_mem(const char *buf, size_t len,
 538                                  const char *prefix,
 539                                  const char **out, size_t *outlen)
 540{
 541        size_t prefix_len = strlen(prefix);
 542        if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
 543                *out = buf + prefix_len;
 544                *outlen = len - prefix_len;
 545                return 1;
 546        }
 547        return 0;
 548}
 549
 550/*
 551 * If buf ends with suffix, return 1 and subtract the length of the suffix
 552 * from *len. Otherwise, return 0 and leave *len untouched.
 553 */
 554static inline int strip_suffix_mem(const char *buf, size_t *len,
 555                                   const char *suffix)
 556{
 557        size_t suflen = strlen(suffix);
 558        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 559                return 0;
 560        *len -= suflen;
 561        return 1;
 562}
 563
 564/*
 565 * If str ends with suffix, return 1 and set *len to the size of the string
 566 * without the suffix. Otherwise, return 0 and set *len to the size of the
 567 * string.
 568 *
 569 * Note that we do _not_ NUL-terminate str to the new length.
 570 */
 571static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 572{
 573        *len = strlen(str);
 574        return strip_suffix_mem(str, len, suffix);
 575}
 576
 577static inline int ends_with(const char *str, const char *suffix)
 578{
 579        size_t len;
 580        return strip_suffix(str, suffix, &len);
 581}
 582
 583#define SWAP(a, b) do {                                         \
 584        void *_swap_a_ptr = &(a);                               \
 585        void *_swap_b_ptr = &(b);                               \
 586        unsigned char _swap_buffer[sizeof(a)];                  \
 587        memcpy(_swap_buffer, _swap_a_ptr, sizeof(a));           \
 588        memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) +            \
 589               BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b)));   \
 590        memcpy(_swap_b_ptr, _swap_buffer, sizeof(a));           \
 591} while (0)
 592
 593#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 594
 595#ifndef PROT_READ
 596#define PROT_READ 1
 597#define PROT_WRITE 2
 598#define MAP_PRIVATE 1
 599#endif
 600
 601#define mmap git_mmap
 602#define munmap git_munmap
 603extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 604extern int git_munmap(void *start, size_t length);
 605
 606#else /* NO_MMAP || USE_WIN32_MMAP */
 607
 608#include <sys/mman.h>
 609
 610#endif /* NO_MMAP || USE_WIN32_MMAP */
 611
 612#ifdef NO_MMAP
 613
 614/* This value must be multiple of (pagesize * 2) */
 615#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 616
 617#else /* NO_MMAP */
 618
 619/* This value must be multiple of (pagesize * 2) */
 620#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 621        (sizeof(void*) >= 8 \
 622                ?  1 * 1024 * 1024 * 1024 \
 623                : 32 * 1024 * 1024)
 624
 625#endif /* NO_MMAP */
 626
 627#ifndef MAP_FAILED
 628#define MAP_FAILED ((void *)-1)
 629#endif
 630
 631#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 632#define on_disk_bytes(st) ((st).st_size)
 633#else
 634#define on_disk_bytes(st) ((st).st_blocks * 512)
 635#endif
 636
 637#ifdef NEEDS_MODE_TRANSLATION
 638#undef S_IFMT
 639#undef S_IFREG
 640#undef S_IFDIR
 641#undef S_IFLNK
 642#undef S_IFBLK
 643#undef S_IFCHR
 644#undef S_IFIFO
 645#undef S_IFSOCK
 646#define S_IFMT   0170000
 647#define S_IFREG  0100000
 648#define S_IFDIR  0040000
 649#define S_IFLNK  0120000
 650#define S_IFBLK  0060000
 651#define S_IFCHR  0020000
 652#define S_IFIFO  0010000
 653#define S_IFSOCK 0140000
 654#ifdef stat
 655#undef stat
 656#endif
 657#define stat(path, buf) git_stat(path, buf)
 658extern int git_stat(const char *, struct stat *);
 659#ifdef fstat
 660#undef fstat
 661#endif
 662#define fstat(fd, buf) git_fstat(fd, buf)
 663extern int git_fstat(int, struct stat *);
 664#ifdef lstat
 665#undef lstat
 666#endif
 667#define lstat(path, buf) git_lstat(path, buf)
 668extern int git_lstat(const char *, struct stat *);
 669#endif
 670
 671#define DEFAULT_PACKED_GIT_LIMIT \
 672        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
 673
 674#ifdef NO_PREAD
 675#define pread git_pread
 676extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 677#endif
 678/*
 679 * Forward decl that will remind us if its twin in cache.h changes.
 680 * This function is used in compat/pread.c.  But we can't include
 681 * cache.h there.
 682 */
 683extern ssize_t read_in_full(int fd, void *buf, size_t count);
 684
 685#ifdef NO_SETENV
 686#define setenv gitsetenv
 687extern int gitsetenv(const char *, const char *, int);
 688#endif
 689
 690#ifdef NO_MKDTEMP
 691#define mkdtemp gitmkdtemp
 692extern char *gitmkdtemp(char *);
 693#endif
 694
 695#ifdef NO_UNSETENV
 696#define unsetenv gitunsetenv
 697extern void gitunsetenv(const char *);
 698#endif
 699
 700#ifdef NO_STRCASESTR
 701#define strcasestr gitstrcasestr
 702extern char *gitstrcasestr(const char *haystack, const char *needle);
 703#endif
 704
 705#ifdef NO_STRLCPY
 706#define strlcpy gitstrlcpy
 707extern size_t gitstrlcpy(char *, const char *, size_t);
 708#endif
 709
 710#ifdef NO_STRTOUMAX
 711#define strtoumax gitstrtoumax
 712extern uintmax_t gitstrtoumax(const char *, char **, int);
 713#define strtoimax gitstrtoimax
 714extern intmax_t gitstrtoimax(const char *, char **, int);
 715#endif
 716
 717#ifdef NO_HSTRERROR
 718#define hstrerror githstrerror
 719extern const char *githstrerror(int herror);
 720#endif
 721
 722#ifdef NO_MEMMEM
 723#define memmem gitmemmem
 724void *gitmemmem(const void *haystack, size_t haystacklen,
 725                const void *needle, size_t needlelen);
 726#endif
 727
 728#ifdef OVERRIDE_STRDUP
 729#ifdef strdup
 730#undef strdup
 731#endif
 732#define strdup gitstrdup
 733char *gitstrdup(const char *s);
 734#endif
 735
 736#ifdef NO_GETPAGESIZE
 737#define getpagesize() sysconf(_SC_PAGESIZE)
 738#endif
 739
 740#ifndef O_CLOEXEC
 741#define O_CLOEXEC 0
 742#endif
 743
 744#ifdef FREAD_READS_DIRECTORIES
 745# if !defined(SUPPRESS_FOPEN_REDEFINITION)
 746#  ifdef fopen
 747#   undef fopen
 748#  endif
 749#  define fopen(a,b) git_fopen(a,b)
 750# endif
 751extern FILE *git_fopen(const char*, const char*);
 752#endif
 753
 754#ifdef SNPRINTF_RETURNS_BOGUS
 755#ifdef snprintf
 756#undef snprintf
 757#endif
 758#define snprintf git_snprintf
 759extern int git_snprintf(char *str, size_t maxsize,
 760                        const char *format, ...);
 761#ifdef vsnprintf
 762#undef vsnprintf
 763#endif
 764#define vsnprintf git_vsnprintf
 765extern int git_vsnprintf(char *str, size_t maxsize,
 766                         const char *format, va_list ap);
 767#endif
 768
 769#ifdef __GLIBC_PREREQ
 770#if __GLIBC_PREREQ(2, 1)
 771#define HAVE_STRCHRNUL
 772#endif
 773#endif
 774
 775#ifndef HAVE_STRCHRNUL
 776#define strchrnul gitstrchrnul
 777static inline char *gitstrchrnul(const char *s, int c)
 778{
 779        while (*s && *s != c)
 780                s++;
 781        return (char *)s;
 782}
 783#endif
 784
 785#ifdef NO_INET_PTON
 786int inet_pton(int af, const char *src, void *dst);
 787#endif
 788
 789#ifdef NO_INET_NTOP
 790const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 791#endif
 792
 793#ifdef NO_PTHREADS
 794#define atexit git_atexit
 795extern int git_atexit(void (*handler)(void));
 796#endif
 797
 798typedef void (*try_to_free_t)(size_t);
 799extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 800
 801static inline size_t st_add(size_t a, size_t b)
 802{
 803        if (unsigned_add_overflows(a, b))
 804                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 805                    (uintmax_t)a, (uintmax_t)b);
 806        return a + b;
 807}
 808#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 809#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 810
 811static inline size_t st_mult(size_t a, size_t b)
 812{
 813        if (unsigned_mult_overflows(a, b))
 814                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 815                    (uintmax_t)a, (uintmax_t)b);
 816        return a * b;
 817}
 818
 819static inline size_t st_sub(size_t a, size_t b)
 820{
 821        if (a < b)
 822                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 823                    (uintmax_t)a, (uintmax_t)b);
 824        return a - b;
 825}
 826
 827#ifdef HAVE_ALLOCA_H
 828# include <alloca.h>
 829# define xalloca(size)      (alloca(size))
 830# define xalloca_free(p)    do {} while (0)
 831#else
 832# define xalloca(size)      (xmalloc(size))
 833# define xalloca_free(p)    (free(p))
 834#endif
 835extern char *xstrdup(const char *str);
 836extern void *xmalloc(size_t size);
 837extern void *xmallocz(size_t size);
 838extern void *xmallocz_gently(size_t size);
 839extern void *xmemdupz(const void *data, size_t len);
 840extern char *xstrndup(const char *str, size_t len);
 841extern void *xrealloc(void *ptr, size_t size);
 842extern void *xcalloc(size_t nmemb, size_t size);
 843extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 844extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 845extern int xopen(const char *path, int flags, ...);
 846extern ssize_t xread(int fd, void *buf, size_t len);
 847extern ssize_t xwrite(int fd, const void *buf, size_t len);
 848extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 849extern int xdup(int fd);
 850extern FILE *xfopen(const char *path, const char *mode);
 851extern FILE *xfdopen(int fd, const char *mode);
 852extern int xmkstemp(char *temp_filename);
 853extern int xmkstemp_mode(char *temp_filename, int mode);
 854extern char *xgetcwd(void);
 855extern FILE *fopen_for_writing(const char *path);
 856extern FILE *fopen_or_warn(const char *path, const char *mode);
 857
 858/*
 859 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
 860 * that ptr is used twice, so don't pass e.g. ptr++.
 861 */
 862#define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
 863
 864#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 865#define CALLOC_ARRAY(x, alloc) (x) = xcalloc((alloc), sizeof(*(x)));
 866#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 867
 868#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
 869        BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 870static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
 871{
 872        if (n)
 873                memcpy(dst, src, st_mult(size, n));
 874}
 875
 876#define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
 877        BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 878static inline void move_array(void *dst, const void *src, size_t n, size_t size)
 879{
 880        if (n)
 881                memmove(dst, src, st_mult(size, n));
 882}
 883
 884/*
 885 * These functions help you allocate structs with flex arrays, and copy
 886 * the data directly into the array. For example, if you had:
 887 *
 888 *   struct foo {
 889 *     int bar;
 890 *     char name[FLEX_ARRAY];
 891 *   };
 892 *
 893 * you can do:
 894 *
 895 *   struct foo *f;
 896 *   FLEX_ALLOC_MEM(f, name, src, len);
 897 *
 898 * to allocate a "foo" with the contents of "src" in the "name" field.
 899 * The resulting struct is automatically zero'd, and the flex-array field
 900 * is NUL-terminated (whether the incoming src buffer was or not).
 901 *
 902 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 903 * but do want to store a pointer to some extra data in the same allocated
 904 * block. For example, if you have:
 905 *
 906 *   struct foo {
 907 *     char *name;
 908 *     int bar;
 909 *   };
 910 *
 911 * you can do:
 912 *
 913 *   struct foo *f;
 914 *   FLEXPTR_ALLOC_STR(f, name, src);
 915 *
 916 * and "name" will point to a block of memory after the struct, which will be
 917 * freed along with the struct (but the pointer can be repointed anywhere).
 918 *
 919 * The *_STR variants accept a string parameter rather than a ptr/len
 920 * combination.
 921 *
 922 * Note that these macros will evaluate the first parameter multiple
 923 * times, and it must be assignable as an lvalue.
 924 */
 925#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 926        size_t flex_array_len_ = (len); \
 927        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 928        memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
 929} while (0)
 930#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 931        size_t flex_array_len_ = (len); \
 932        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 933        memcpy((x) + 1, (buf), flex_array_len_); \
 934        (x)->ptrname = (void *)((x)+1); \
 935} while(0)
 936#define FLEX_ALLOC_STR(x, flexname, str) \
 937        FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 938#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 939        FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 940
 941static inline char *xstrdup_or_null(const char *str)
 942{
 943        return str ? xstrdup(str) : NULL;
 944}
 945
 946static inline size_t xsize_t(off_t len)
 947{
 948        size_t size = (size_t) len;
 949
 950        if (len != (off_t) size)
 951                die("Cannot handle files this big");
 952        return size;
 953}
 954
 955__attribute__((format (printf, 3, 4)))
 956extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 957
 958#ifndef HOST_NAME_MAX
 959#define HOST_NAME_MAX 256
 960#endif
 961
 962extern int xgethostname(char *buf, size_t len);
 963
 964/* in ctype.c, for kwset users */
 965extern const unsigned char tolower_trans_tbl[256];
 966
 967/* Sane ctype - no locale, and works with signed chars */
 968#undef isascii
 969#undef isspace
 970#undef isdigit
 971#undef isalpha
 972#undef isalnum
 973#undef isprint
 974#undef islower
 975#undef isupper
 976#undef tolower
 977#undef toupper
 978#undef iscntrl
 979#undef ispunct
 980#undef isxdigit
 981
 982extern const unsigned char sane_ctype[256];
 983#define GIT_SPACE 0x01
 984#define GIT_DIGIT 0x02
 985#define GIT_ALPHA 0x04
 986#define GIT_GLOB_SPECIAL 0x08
 987#define GIT_REGEX_SPECIAL 0x10
 988#define GIT_PATHSPEC_MAGIC 0x20
 989#define GIT_CNTRL 0x40
 990#define GIT_PUNCT 0x80
 991#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 992#define isascii(x) (((x) & ~0x7f) == 0)
 993#define isspace(x) sane_istest(x,GIT_SPACE)
 994#define isdigit(x) sane_istest(x,GIT_DIGIT)
 995#define isalpha(x) sane_istest(x,GIT_ALPHA)
 996#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 997#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 998#define islower(x) sane_iscase(x, 1)
 999#define isupper(x) sane_iscase(x, 0)
1000#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
1001#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
1002#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
1003#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
1004                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
1005#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
1006#define tolower(x) sane_case((unsigned char)(x), 0x20)
1007#define toupper(x) sane_case((unsigned char)(x), 0)
1008#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
1009
1010static inline int sane_case(int x, int high)
1011{
1012        if (sane_istest(x, GIT_ALPHA))
1013                x = (x & ~0x20) | high;
1014        return x;
1015}
1016
1017static inline int sane_iscase(int x, int is_lower)
1018{
1019        if (!sane_istest(x, GIT_ALPHA))
1020                return 0;
1021
1022        if (is_lower)
1023                return (x & 0x20) != 0;
1024        else
1025                return (x & 0x20) == 0;
1026}
1027
1028/*
1029 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1030 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1031 * locale-specific conversions).
1032 */
1033static inline int skip_iprefix(const char *str, const char *prefix,
1034                               const char **out)
1035{
1036        do {
1037                if (!*prefix) {
1038                        *out = str;
1039                        return 1;
1040                }
1041        } while (tolower(*str++) == tolower(*prefix++));
1042        return 0;
1043}
1044
1045static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1046{
1047        unsigned long ul;
1048        char *p;
1049
1050        errno = 0;
1051        /* negative values would be accepted by strtoul */
1052        if (strchr(s, '-'))
1053                return -1;
1054        ul = strtoul(s, &p, base);
1055        if (errno || *p || p == s || (unsigned int) ul != ul)
1056                return -1;
1057        *result = ul;
1058        return 0;
1059}
1060
1061static inline int strtol_i(char const *s, int base, int *result)
1062{
1063        long ul;
1064        char *p;
1065
1066        errno = 0;
1067        ul = strtol(s, &p, base);
1068        if (errno || *p || p == s || (int) ul != ul)
1069                return -1;
1070        *result = ul;
1071        return 0;
1072}
1073
1074#ifdef INTERNAL_QSORT
1075void git_qsort(void *base, size_t nmemb, size_t size,
1076               int(*compar)(const void *, const void *));
1077#define qsort git_qsort
1078#endif
1079
1080#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1081static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1082                              int(*compar)(const void *, const void *))
1083{
1084        if (nmemb > 1)
1085                qsort(base, nmemb, size, compar);
1086}
1087
1088#ifndef HAVE_ISO_QSORT_S
1089int git_qsort_s(void *base, size_t nmemb, size_t size,
1090                int (*compar)(const void *, const void *, void *), void *ctx);
1091#define qsort_s git_qsort_s
1092#endif
1093
1094#define QSORT_S(base, n, compar, ctx) do {                      \
1095        if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1096                BUG("qsort_s() failed");                        \
1097} while (0)
1098
1099#ifndef REG_STARTEND
1100#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1101#endif
1102
1103static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1104                              size_t nmatch, regmatch_t pmatch[], int eflags)
1105{
1106        assert(nmatch > 0 && pmatch);
1107        pmatch[0].rm_so = 0;
1108        pmatch[0].rm_eo = size;
1109        return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1110}
1111
1112#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1113# define FORCE_DIR_SET_GID S_ISGID
1114#else
1115# define FORCE_DIR_SET_GID 0
1116#endif
1117
1118#ifdef NO_NSEC
1119#undef USE_NSEC
1120#define ST_CTIME_NSEC(st) 0
1121#define ST_MTIME_NSEC(st) 0
1122#else
1123#ifdef USE_ST_TIMESPEC
1124#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1125#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1126#else
1127#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1128#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1129#endif
1130#endif
1131
1132#ifdef UNRELIABLE_FSTAT
1133#define fstat_is_reliable() 0
1134#else
1135#define fstat_is_reliable() 1
1136#endif
1137
1138#ifndef va_copy
1139/*
1140 * Since an obvious implementation of va_list would be to make it a
1141 * pointer into the stack frame, a simple assignment will work on
1142 * many systems.  But let's try to be more portable.
1143 */
1144#ifdef __va_copy
1145#define va_copy(dst, src) __va_copy(dst, src)
1146#else
1147#define va_copy(dst, src) ((dst) = (src))
1148#endif
1149#endif
1150
1151#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1152#define HAVE_VARIADIC_MACROS 1
1153#endif
1154
1155/* usage.c: only to be used for testing BUG() implementation (see test-tool) */
1156extern int BUG_exit_code;
1157
1158#ifdef HAVE_VARIADIC_MACROS
1159__attribute__((format (printf, 3, 4))) NORETURN
1160void BUG_fl(const char *file, int line, const char *fmt, ...);
1161#define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1162#else
1163__attribute__((format (printf, 1, 2))) NORETURN
1164void BUG(const char *fmt, ...);
1165#endif
1166
1167/*
1168 * Preserves errno, prints a message, but gives no warning for ENOENT.
1169 * Returns 0 on success, which includes trying to unlink an object that does
1170 * not exist.
1171 */
1172int unlink_or_warn(const char *path);
1173 /*
1174  * Tries to unlink file.  Returns 0 if unlink succeeded
1175  * or the file already didn't exist.  Returns -1 and
1176  * appends a message to err suitable for
1177  * 'error("%s", err->buf)' on error.
1178  */
1179int unlink_or_msg(const char *file, struct strbuf *err);
1180/*
1181 * Preserves errno, prints a message, but gives no warning for ENOENT.
1182 * Returns 0 on success, which includes trying to remove a directory that does
1183 * not exist.
1184 */
1185int rmdir_or_warn(const char *path);
1186/*
1187 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1188 * the supplied file mode.
1189 */
1190int remove_or_warn(unsigned int mode, const char *path);
1191
1192/*
1193 * Call access(2), but warn for any error except "missing file"
1194 * (ENOENT or ENOTDIR).
1195 */
1196#define ACCESS_EACCES_OK (1U << 0)
1197int access_or_warn(const char *path, int mode, unsigned flag);
1198int access_or_die(const char *path, int mode, unsigned flag);
1199
1200/* Warn on an inaccessible file if errno indicates this is an error */
1201int warn_on_fopen_errors(const char *path);
1202
1203#ifdef GMTIME_UNRELIABLE_ERRORS
1204struct tm *git_gmtime(const time_t *);
1205struct tm *git_gmtime_r(const time_t *, struct tm *);
1206#define gmtime git_gmtime
1207#define gmtime_r git_gmtime_r
1208#endif
1209
1210#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1211#define USE_PARENS_AROUND_GETTEXT_N 1
1212#endif
1213
1214#ifndef SHELL_PATH
1215# define SHELL_PATH "/bin/sh"
1216#endif
1217
1218#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1219#define flockfile(fh)
1220#define funlockfile(fh)
1221#define getc_unlocked(fh) getc(fh)
1222#endif
1223
1224/*
1225 * Our code often opens a path to an optional file, to work on its
1226 * contents when we can successfully open it.  We can ignore a failure
1227 * to open if such an optional file does not exist, but we do want to
1228 * report a failure in opening for other reasons (e.g. we got an I/O
1229 * error, or the file is there, but we lack the permission to open).
1230 *
1231 * Call this function after seeing an error from open() or fopen() to
1232 * see if the errno indicates a missing file that we can safely ignore.
1233 */
1234static inline int is_missing_file_error(int errno_)
1235{
1236        return (errno_ == ENOENT || errno_ == ENOTDIR);
1237}
1238
1239extern int cmd_main(int, const char **);
1240
1241/*
1242 * You can mark a stack variable with UNLEAK(var) to avoid it being
1243 * reported as a leak by tools like LSAN or valgrind. The argument
1244 * should generally be the variable itself (not its address and not what
1245 * it points to). It's safe to use this on pointers which may already
1246 * have been freed, or on pointers which may still be in use.
1247 *
1248 * Use this _only_ for a variable that leaks by going out of scope at
1249 * program exit (so only from cmd_* functions or their direct helpers).
1250 * Normal functions, especially those which may be called multiple
1251 * times, should actually free their memory. This is only meant as
1252 * an annotation, and does nothing in non-leak-checking builds.
1253 */
1254#ifdef SUPPRESS_ANNOTATED_LEAKS
1255extern void unleak_memory(const void *ptr, size_t len);
1256#define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1257#else
1258#define UNLEAK(var) do {} while (0)
1259#endif
1260
1261/*
1262 * This include must come after system headers, since it introduces macros that
1263 * replace system names.
1264 */
1265#include "banned.h"
1266
1267#endif