Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit builtin/send-pack: populate the default configs (d067d98)
   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 (_MSC_VER) && !defined(_WIN32_WINNT)
 150#  define _WIN32_WINNT 0x0502
 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#ifndef NO_SYS_POLL_H
 184#include <sys/poll.h>
 185#else
 186#include <poll.h>
 187#endif
 188#ifdef HAVE_BSD_SYSCTL
 189#include <sys/sysctl.h>
 190#endif
 191
 192#if defined(__CYGWIN__)
 193#include "compat/cygwin.h"
 194#endif
 195#if defined(__MINGW32__)
 196/* pull in Windows compatibility stuff */
 197#include "compat/mingw.h"
 198#elif defined(_MSC_VER)
 199#include "compat/msvc.h"
 200#else
 201#include <sys/utsname.h>
 202#include <sys/wait.h>
 203#include <sys/resource.h>
 204#include <sys/socket.h>
 205#include <sys/ioctl.h>
 206#include <termios.h>
 207#ifndef NO_SYS_SELECT_H
 208#include <sys/select.h>
 209#endif
 210#include <netinet/in.h>
 211#include <netinet/tcp.h>
 212#include <arpa/inet.h>
 213#include <netdb.h>
 214#include <pwd.h>
 215#include <sys/un.h>
 216#ifndef NO_INTTYPES_H
 217#include <inttypes.h>
 218#else
 219#include <stdint.h>
 220#endif
 221#ifdef NO_INTPTR_T
 222/*
 223 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 224 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 225 * while on IP16 and IP16L32 it is "int" (resp. "short")
 226 * Size needs to match (or exceed) 'sizeof(void *)'.
 227 * We can't take "long long" here as not everybody has it.
 228 */
 229typedef long intptr_t;
 230typedef unsigned long uintptr_t;
 231#endif
 232#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 233#include <grp.h>
 234#define _ALL_SOURCE 1
 235#endif
 236
 237/* used on Mac OS X */
 238#ifdef PRECOMPOSE_UNICODE
 239#include "compat/precompose_utf8.h"
 240#else
 241#define precompose_str(in,i_nfd2nfc)
 242#define precompose_argv(c,v)
 243#define probe_utf8_pathname_composition()
 244#endif
 245
 246#ifdef MKDIR_WO_TRAILING_SLASH
 247#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 248extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 249#endif
 250
 251#ifdef NO_STRUCT_ITIMERVAL
 252struct itimerval {
 253        struct timeval it_interval;
 254        struct timeval it_value;
 255};
 256#endif
 257
 258#ifdef NO_SETITIMER
 259#define setitimer(which,value,ovalue)
 260#endif
 261
 262#ifndef NO_LIBGEN_H
 263#include <libgen.h>
 264#else
 265#define basename gitbasename
 266extern char *gitbasename(char *);
 267#define dirname gitdirname
 268extern char *gitdirname(char *);
 269#endif
 270
 271#ifndef NO_ICONV
 272#include <iconv.h>
 273#endif
 274
 275#ifndef NO_OPENSSL
 276#ifdef __APPLE__
 277#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 278#include <AvailabilityMacros.h>
 279#undef DEPRECATED_ATTRIBUTE
 280#define DEPRECATED_ATTRIBUTE
 281#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 282#endif
 283#include <openssl/ssl.h>
 284#include <openssl/err.h>
 285#endif
 286
 287/* On most systems <netdb.h> would have given us this, but
 288 * not on some systems (e.g. z/OS).
 289 */
 290#ifndef NI_MAXHOST
 291#define NI_MAXHOST 1025
 292#endif
 293
 294#ifndef NI_MAXSERV
 295#define NI_MAXSERV 32
 296#endif
 297
 298/* On most systems <limits.h> would have given us this, but
 299 * not on some systems (e.g. GNU/Hurd).
 300 */
 301#ifndef PATH_MAX
 302#define PATH_MAX 4096
 303#endif
 304
 305#ifndef PRIuMAX
 306#define PRIuMAX "llu"
 307#endif
 308
 309#ifndef SCNuMAX
 310#define SCNuMAX PRIuMAX
 311#endif
 312
 313#ifndef PRIu32
 314#define PRIu32 "u"
 315#endif
 316
 317#ifndef PRIx32
 318#define PRIx32 "x"
 319#endif
 320
 321#ifndef PRIo32
 322#define PRIo32 "o"
 323#endif
 324
 325typedef uintmax_t timestamp_t;
 326#define PRItime PRIuMAX
 327#define parse_timestamp strtoumax
 328#define TIME_MAX UINTMAX_MAX
 329
 330#ifndef PATH_SEP
 331#define PATH_SEP ':'
 332#endif
 333
 334#ifdef HAVE_PATHS_H
 335#include <paths.h>
 336#endif
 337#ifndef _PATH_DEFPATH
 338#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 339#endif
 340
 341#ifndef has_dos_drive_prefix
 342static inline int git_has_dos_drive_prefix(const char *path)
 343{
 344        return 0;
 345}
 346#define has_dos_drive_prefix git_has_dos_drive_prefix
 347#endif
 348
 349#ifndef skip_dos_drive_prefix
 350static inline int git_skip_dos_drive_prefix(char **path)
 351{
 352        return 0;
 353}
 354#define skip_dos_drive_prefix git_skip_dos_drive_prefix
 355#endif
 356
 357#ifndef is_dir_sep
 358static inline int git_is_dir_sep(int c)
 359{
 360        return c == '/';
 361}
 362#define is_dir_sep git_is_dir_sep
 363#endif
 364
 365#ifndef offset_1st_component
 366static inline int git_offset_1st_component(const char *path)
 367{
 368        return is_dir_sep(path[0]);
 369}
 370#define offset_1st_component git_offset_1st_component
 371#endif
 372
 373#ifndef find_last_dir_sep
 374static inline char *git_find_last_dir_sep(const char *path)
 375{
 376        return strrchr(path, '/');
 377}
 378#define find_last_dir_sep git_find_last_dir_sep
 379#endif
 380
 381#if defined(__HP_cc) && (__HP_cc >= 61000)
 382#define NORETURN __attribute__((noreturn))
 383#define NORETURN_PTR
 384#elif defined(__GNUC__) && !defined(NO_NORETURN)
 385#define NORETURN __attribute__((__noreturn__))
 386#define NORETURN_PTR __attribute__((__noreturn__))
 387#elif defined(_MSC_VER)
 388#define NORETURN __declspec(noreturn)
 389#define NORETURN_PTR
 390#else
 391#define NORETURN
 392#define NORETURN_PTR
 393#ifndef __GNUC__
 394#ifndef __attribute__
 395#define __attribute__(x)
 396#endif
 397#endif
 398#endif
 399
 400/* The sentinel attribute is valid from gcc version 4.0 */
 401#if defined(__GNUC__) && (__GNUC__ >= 4)
 402#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 403#else
 404#define LAST_ARG_MUST_BE_NULL
 405#endif
 406
 407#include "compat/bswap.h"
 408
 409#include "wildmatch.h"
 410
 411struct strbuf;
 412
 413/* General helper functions */
 414extern void vreportf(const char *prefix, const char *err, va_list params);
 415extern NORETURN void usage(const char *err);
 416extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 417extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 418extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 419extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 420extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 421extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 422extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 423
 424#ifndef NO_OPENSSL
 425#ifdef APPLE_COMMON_CRYPTO
 426#include "compat/apple-common-crypto.h"
 427#else
 428#include <openssl/evp.h>
 429#include <openssl/hmac.h>
 430#endif /* APPLE_COMMON_CRYPTO */
 431#include <openssl/x509v3.h>
 432#endif /* NO_OPENSSL */
 433
 434/*
 435 * Let callers be aware of the constant return value; this can help
 436 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 437 * because some compilers may not support variadic macros. Since we're only
 438 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 439 * using the function as usual.
 440 */
 441#if defined(__GNUC__)
 442static inline int const_error(void)
 443{
 444        return -1;
 445}
 446#define error(...) (error(__VA_ARGS__), const_error())
 447#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 448#endif
 449
 450extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 451extern void set_error_routine(void (*routine)(const char *err, va_list params));
 452extern void (*get_error_routine(void))(const char *err, va_list params);
 453extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 454extern void (*get_warn_routine(void))(const char *warn, va_list params);
 455extern void set_die_is_recursing_routine(int (*routine)(void));
 456
 457extern int starts_with(const char *str, const char *prefix);
 458
 459/*
 460 * If the string "str" begins with the string found in "prefix", return 1.
 461 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 462 * the string right after the prefix).
 463 *
 464 * Otherwise, return 0 and leave "out" untouched.
 465 *
 466 * Examples:
 467 *
 468 *   [extract branch name, fail if not a branch]
 469 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 470 *      return -1;
 471 *
 472 *   [skip prefix if present, otherwise use whole string]
 473 *   skip_prefix(name, "refs/heads/", &name);
 474 */
 475static inline int skip_prefix(const char *str, const char *prefix,
 476                              const char **out)
 477{
 478        do {
 479                if (!*prefix) {
 480                        *out = str;
 481                        return 1;
 482                }
 483        } while (*str++ == *prefix++);
 484        return 0;
 485}
 486
 487/*
 488 * If the string "str" is the same as the string in "prefix", then the "arg"
 489 * parameter is set to the "def" parameter and 1 is returned.
 490 * If the string "str" begins with the string found in "prefix" and then a
 491 * "=" sign, then the "arg" parameter is set to "str + strlen(prefix) + 1"
 492 * (i.e., to the point in the string right after the prefix and the "=" sign),
 493 * and 1 is returned.
 494 *
 495 * Otherwise, return 0 and leave "arg" untouched.
 496 *
 497 * When we accept both a "--key" and a "--key=<val>" option, this function
 498 * can be used instead of !strcmp(arg, "--key") and then
 499 * skip_prefix(arg, "--key=", &arg) to parse such an option.
 500 */
 501int skip_to_optional_arg_default(const char *str, const char *prefix,
 502                                 const char **arg, const char *def);
 503
 504static inline int skip_to_optional_arg(const char *str, const char *prefix,
 505                                       const char **arg)
 506{
 507        return skip_to_optional_arg_default(str, prefix, arg, "");
 508}
 509
 510/*
 511 * Like skip_prefix, but promises never to read past "len" bytes of the input
 512 * buffer, and returns the remaining number of bytes in "out" via "outlen".
 513 */
 514static inline int skip_prefix_mem(const char *buf, size_t len,
 515                                  const char *prefix,
 516                                  const char **out, size_t *outlen)
 517{
 518        size_t prefix_len = strlen(prefix);
 519        if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
 520                *out = buf + prefix_len;
 521                *outlen = len - prefix_len;
 522                return 1;
 523        }
 524        return 0;
 525}
 526
 527/*
 528 * If buf ends with suffix, return 1 and subtract the length of the suffix
 529 * from *len. Otherwise, return 0 and leave *len untouched.
 530 */
 531static inline int strip_suffix_mem(const char *buf, size_t *len,
 532                                   const char *suffix)
 533{
 534        size_t suflen = strlen(suffix);
 535        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 536                return 0;
 537        *len -= suflen;
 538        return 1;
 539}
 540
 541/*
 542 * If str ends with suffix, return 1 and set *len to the size of the string
 543 * without the suffix. Otherwise, return 0 and set *len to the size of the
 544 * string.
 545 *
 546 * Note that we do _not_ NUL-terminate str to the new length.
 547 */
 548static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 549{
 550        *len = strlen(str);
 551        return strip_suffix_mem(str, len, suffix);
 552}
 553
 554static inline int ends_with(const char *str, const char *suffix)
 555{
 556        size_t len;
 557        return strip_suffix(str, suffix, &len);
 558}
 559
 560#define SWAP(a, b) do {                                         \
 561        void *_swap_a_ptr = &(a);                               \
 562        void *_swap_b_ptr = &(b);                               \
 563        unsigned char _swap_buffer[sizeof(a)];                  \
 564        memcpy(_swap_buffer, _swap_a_ptr, sizeof(a));           \
 565        memcpy(_swap_a_ptr, _swap_b_ptr, sizeof(a) +            \
 566               BUILD_ASSERT_OR_ZERO(sizeof(a) == sizeof(b)));   \
 567        memcpy(_swap_b_ptr, _swap_buffer, sizeof(a));           \
 568} while (0)
 569
 570#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 571
 572#ifndef PROT_READ
 573#define PROT_READ 1
 574#define PROT_WRITE 2
 575#define MAP_PRIVATE 1
 576#endif
 577
 578#define mmap git_mmap
 579#define munmap git_munmap
 580extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 581extern int git_munmap(void *start, size_t length);
 582
 583#else /* NO_MMAP || USE_WIN32_MMAP */
 584
 585#include <sys/mman.h>
 586
 587#endif /* NO_MMAP || USE_WIN32_MMAP */
 588
 589#ifdef NO_MMAP
 590
 591/* This value must be multiple of (pagesize * 2) */
 592#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 593
 594#else /* NO_MMAP */
 595
 596/* This value must be multiple of (pagesize * 2) */
 597#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 598        (sizeof(void*) >= 8 \
 599                ?  1 * 1024 * 1024 * 1024 \
 600                : 32 * 1024 * 1024)
 601
 602#endif /* NO_MMAP */
 603
 604#ifndef MAP_FAILED
 605#define MAP_FAILED ((void *)-1)
 606#endif
 607
 608#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 609#define on_disk_bytes(st) ((st).st_size)
 610#else
 611#define on_disk_bytes(st) ((st).st_blocks * 512)
 612#endif
 613
 614#ifdef NEEDS_MODE_TRANSLATION
 615#undef S_IFMT
 616#undef S_IFREG
 617#undef S_IFDIR
 618#undef S_IFLNK
 619#undef S_IFBLK
 620#undef S_IFCHR
 621#undef S_IFIFO
 622#undef S_IFSOCK
 623#define S_IFMT   0170000
 624#define S_IFREG  0100000
 625#define S_IFDIR  0040000
 626#define S_IFLNK  0120000
 627#define S_IFBLK  0060000
 628#define S_IFCHR  0020000
 629#define S_IFIFO  0010000
 630#define S_IFSOCK 0140000
 631#ifdef stat
 632#undef stat
 633#endif
 634#define stat(path, buf) git_stat(path, buf)
 635extern int git_stat(const char *, struct stat *);
 636#ifdef fstat
 637#undef fstat
 638#endif
 639#define fstat(fd, buf) git_fstat(fd, buf)
 640extern int git_fstat(int, struct stat *);
 641#ifdef lstat
 642#undef lstat
 643#endif
 644#define lstat(path, buf) git_lstat(path, buf)
 645extern int git_lstat(const char *, struct stat *);
 646#endif
 647
 648#define DEFAULT_PACKED_GIT_LIMIT \
 649        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? (32 * 1024L * 1024L) : 256))
 650
 651#ifdef NO_PREAD
 652#define pread git_pread
 653extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 654#endif
 655/*
 656 * Forward decl that will remind us if its twin in cache.h changes.
 657 * This function is used in compat/pread.c.  But we can't include
 658 * cache.h there.
 659 */
 660extern ssize_t read_in_full(int fd, void *buf, size_t count);
 661
 662#ifdef NO_SETENV
 663#define setenv gitsetenv
 664extern int gitsetenv(const char *, const char *, int);
 665#endif
 666
 667#ifdef NO_MKDTEMP
 668#define mkdtemp gitmkdtemp
 669extern char *gitmkdtemp(char *);
 670#endif
 671
 672#ifdef NO_UNSETENV
 673#define unsetenv gitunsetenv
 674extern void gitunsetenv(const char *);
 675#endif
 676
 677#ifdef NO_STRCASESTR
 678#define strcasestr gitstrcasestr
 679extern char *gitstrcasestr(const char *haystack, const char *needle);
 680#endif
 681
 682#ifdef NO_STRLCPY
 683#define strlcpy gitstrlcpy
 684extern size_t gitstrlcpy(char *, const char *, size_t);
 685#endif
 686
 687#ifdef NO_STRTOUMAX
 688#define strtoumax gitstrtoumax
 689extern uintmax_t gitstrtoumax(const char *, char **, int);
 690#define strtoimax gitstrtoimax
 691extern intmax_t gitstrtoimax(const char *, char **, int);
 692#endif
 693
 694#ifdef NO_HSTRERROR
 695#define hstrerror githstrerror
 696extern const char *githstrerror(int herror);
 697#endif
 698
 699#ifdef NO_MEMMEM
 700#define memmem gitmemmem
 701void *gitmemmem(const void *haystack, size_t haystacklen,
 702                const void *needle, size_t needlelen);
 703#endif
 704
 705#ifdef OVERRIDE_STRDUP
 706#ifdef strdup
 707#undef strdup
 708#endif
 709#define strdup gitstrdup
 710char *gitstrdup(const char *s);
 711#endif
 712
 713#ifdef NO_GETPAGESIZE
 714#define getpagesize() sysconf(_SC_PAGESIZE)
 715#endif
 716
 717#ifndef O_CLOEXEC
 718#define O_CLOEXEC 0
 719#endif
 720
 721#ifdef FREAD_READS_DIRECTORIES
 722# if !defined(SUPPRESS_FOPEN_REDEFINITION)
 723#  ifdef fopen
 724#   undef fopen
 725#  endif
 726#  define fopen(a,b) git_fopen(a,b)
 727# endif
 728extern FILE *git_fopen(const char*, const char*);
 729#endif
 730
 731#ifdef SNPRINTF_RETURNS_BOGUS
 732#ifdef snprintf
 733#undef snprintf
 734#endif
 735#define snprintf git_snprintf
 736extern int git_snprintf(char *str, size_t maxsize,
 737                        const char *format, ...);
 738#ifdef vsnprintf
 739#undef vsnprintf
 740#endif
 741#define vsnprintf git_vsnprintf
 742extern int git_vsnprintf(char *str, size_t maxsize,
 743                         const char *format, va_list ap);
 744#endif
 745
 746#ifdef __GLIBC_PREREQ
 747#if __GLIBC_PREREQ(2, 1)
 748#define HAVE_STRCHRNUL
 749#endif
 750#endif
 751
 752#ifndef HAVE_STRCHRNUL
 753#define strchrnul gitstrchrnul
 754static inline char *gitstrchrnul(const char *s, int c)
 755{
 756        while (*s && *s != c)
 757                s++;
 758        return (char *)s;
 759}
 760#endif
 761
 762#ifdef NO_INET_PTON
 763int inet_pton(int af, const char *src, void *dst);
 764#endif
 765
 766#ifdef NO_INET_NTOP
 767const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 768#endif
 769
 770#ifdef NO_PTHREADS
 771#define atexit git_atexit
 772extern int git_atexit(void (*handler)(void));
 773#endif
 774
 775typedef void (*try_to_free_t)(size_t);
 776extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 777
 778static inline size_t st_add(size_t a, size_t b)
 779{
 780        if (unsigned_add_overflows(a, b))
 781                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 782                    (uintmax_t)a, (uintmax_t)b);
 783        return a + b;
 784}
 785#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 786#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 787
 788static inline size_t st_mult(size_t a, size_t b)
 789{
 790        if (unsigned_mult_overflows(a, b))
 791                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 792                    (uintmax_t)a, (uintmax_t)b);
 793        return a * b;
 794}
 795
 796static inline size_t st_sub(size_t a, size_t b)
 797{
 798        if (a < b)
 799                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 800                    (uintmax_t)a, (uintmax_t)b);
 801        return a - b;
 802}
 803
 804#ifdef HAVE_ALLOCA_H
 805# include <alloca.h>
 806# define xalloca(size)      (alloca(size))
 807# define xalloca_free(p)    do {} while (0)
 808#else
 809# define xalloca(size)      (xmalloc(size))
 810# define xalloca_free(p)    (free(p))
 811#endif
 812extern char *xstrdup(const char *str);
 813extern void *xmalloc(size_t size);
 814extern void *xmallocz(size_t size);
 815extern void *xmallocz_gently(size_t size);
 816extern void *xmemdupz(const void *data, size_t len);
 817extern char *xstrndup(const char *str, size_t len);
 818extern void *xrealloc(void *ptr, size_t size);
 819extern void *xcalloc(size_t nmemb, size_t size);
 820extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 821extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 822extern int xopen(const char *path, int flags, ...);
 823extern ssize_t xread(int fd, void *buf, size_t len);
 824extern ssize_t xwrite(int fd, const void *buf, size_t len);
 825extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 826extern int xdup(int fd);
 827extern FILE *xfopen(const char *path, const char *mode);
 828extern FILE *xfdopen(int fd, const char *mode);
 829extern int xmkstemp(char *template);
 830extern int xmkstemp_mode(char *template, int mode);
 831extern char *xgetcwd(void);
 832extern FILE *fopen_for_writing(const char *path);
 833extern FILE *fopen_or_warn(const char *path, const char *mode);
 834
 835/*
 836 * FREE_AND_NULL(ptr) is like free(ptr) followed by ptr = NULL. Note
 837 * that ptr is used twice, so don't pass e.g. ptr++.
 838 */
 839#define FREE_AND_NULL(p) do { free(p); (p) = NULL; } while (0)
 840
 841#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 842#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 843
 844#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
 845        BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 846static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
 847{
 848        if (n)
 849                memcpy(dst, src, st_mult(size, n));
 850}
 851
 852#define MOVE_ARRAY(dst, src, n) move_array((dst), (src), (n), sizeof(*(dst)) + \
 853        BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 854static inline void move_array(void *dst, const void *src, size_t n, size_t size)
 855{
 856        if (n)
 857                memmove(dst, src, st_mult(size, n));
 858}
 859
 860/*
 861 * These functions help you allocate structs with flex arrays, and copy
 862 * the data directly into the array. For example, if you had:
 863 *
 864 *   struct foo {
 865 *     int bar;
 866 *     char name[FLEX_ARRAY];
 867 *   };
 868 *
 869 * you can do:
 870 *
 871 *   struct foo *f;
 872 *   FLEX_ALLOC_MEM(f, name, src, len);
 873 *
 874 * to allocate a "foo" with the contents of "src" in the "name" field.
 875 * The resulting struct is automatically zero'd, and the flex-array field
 876 * is NUL-terminated (whether the incoming src buffer was or not).
 877 *
 878 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 879 * but do want to store a pointer to some extra data in the same allocated
 880 * block. For example, if you have:
 881 *
 882 *   struct foo {
 883 *     char *name;
 884 *     int bar;
 885 *   };
 886 *
 887 * you can do:
 888 *
 889 *   struct foo *f;
 890 *   FLEXPTR_ALLOC_STR(f, name, src);
 891 *
 892 * and "name" will point to a block of memory after the struct, which will be
 893 * freed along with the struct (but the pointer can be repointed anywhere).
 894 *
 895 * The *_STR variants accept a string parameter rather than a ptr/len
 896 * combination.
 897 *
 898 * Note that these macros will evaluate the first parameter multiple
 899 * times, and it must be assignable as an lvalue.
 900 */
 901#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 902        size_t flex_array_len_ = (len); \
 903        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 904        memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
 905} while (0)
 906#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 907        size_t flex_array_len_ = (len); \
 908        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 909        memcpy((x) + 1, (buf), flex_array_len_); \
 910        (x)->ptrname = (void *)((x)+1); \
 911} while(0)
 912#define FLEX_ALLOC_STR(x, flexname, str) \
 913        FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 914#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 915        FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 916
 917static inline char *xstrdup_or_null(const char *str)
 918{
 919        return str ? xstrdup(str) : NULL;
 920}
 921
 922static inline size_t xsize_t(off_t len)
 923{
 924        size_t size = (size_t) len;
 925
 926        if (len != (off_t) size)
 927                die("Cannot handle files this big");
 928        return size;
 929}
 930
 931__attribute__((format (printf, 3, 4)))
 932extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 933
 934#ifndef HOST_NAME_MAX
 935#define HOST_NAME_MAX 256
 936#endif
 937
 938extern int xgethostname(char *buf, size_t len);
 939
 940/* in ctype.c, for kwset users */
 941extern const unsigned char tolower_trans_tbl[256];
 942
 943/* Sane ctype - no locale, and works with signed chars */
 944#undef isascii
 945#undef isspace
 946#undef isdigit
 947#undef isalpha
 948#undef isalnum
 949#undef isprint
 950#undef islower
 951#undef isupper
 952#undef tolower
 953#undef toupper
 954#undef iscntrl
 955#undef ispunct
 956#undef isxdigit
 957
 958extern const unsigned char sane_ctype[256];
 959#define GIT_SPACE 0x01
 960#define GIT_DIGIT 0x02
 961#define GIT_ALPHA 0x04
 962#define GIT_GLOB_SPECIAL 0x08
 963#define GIT_REGEX_SPECIAL 0x10
 964#define GIT_PATHSPEC_MAGIC 0x20
 965#define GIT_CNTRL 0x40
 966#define GIT_PUNCT 0x80
 967#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 968#define isascii(x) (((x) & ~0x7f) == 0)
 969#define isspace(x) sane_istest(x,GIT_SPACE)
 970#define isdigit(x) sane_istest(x,GIT_DIGIT)
 971#define isalpha(x) sane_istest(x,GIT_ALPHA)
 972#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 973#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 974#define islower(x) sane_iscase(x, 1)
 975#define isupper(x) sane_iscase(x, 0)
 976#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 977#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 978#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 979#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 980                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 981#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 982#define tolower(x) sane_case((unsigned char)(x), 0x20)
 983#define toupper(x) sane_case((unsigned char)(x), 0)
 984#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 985
 986static inline int sane_case(int x, int high)
 987{
 988        if (sane_istest(x, GIT_ALPHA))
 989                x = (x & ~0x20) | high;
 990        return x;
 991}
 992
 993static inline int sane_iscase(int x, int is_lower)
 994{
 995        if (!sane_istest(x, GIT_ALPHA))
 996                return 0;
 997
 998        if (is_lower)
 999                return (x & 0x20) != 0;
1000        else
1001                return (x & 0x20) == 0;
1002}
1003
1004/*
1005 * Like skip_prefix, but compare case-insensitively. Note that the comparison
1006 * is done via tolower(), so it is strictly ASCII (no multi-byte characters or
1007 * locale-specific conversions).
1008 */
1009static inline int skip_iprefix(const char *str, const char *prefix,
1010                               const char **out)
1011{
1012        do {
1013                if (!*prefix) {
1014                        *out = str;
1015                        return 1;
1016                }
1017        } while (tolower(*str++) == tolower(*prefix++));
1018        return 0;
1019}
1020
1021static inline int strtoul_ui(char const *s, int base, unsigned int *result)
1022{
1023        unsigned long ul;
1024        char *p;
1025
1026        errno = 0;
1027        /* negative values would be accepted by strtoul */
1028        if (strchr(s, '-'))
1029                return -1;
1030        ul = strtoul(s, &p, base);
1031        if (errno || *p || p == s || (unsigned int) ul != ul)
1032                return -1;
1033        *result = ul;
1034        return 0;
1035}
1036
1037static inline int strtol_i(char const *s, int base, int *result)
1038{
1039        long ul;
1040        char *p;
1041
1042        errno = 0;
1043        ul = strtol(s, &p, base);
1044        if (errno || *p || p == s || (int) ul != ul)
1045                return -1;
1046        *result = ul;
1047        return 0;
1048}
1049
1050#ifdef INTERNAL_QSORT
1051void git_qsort(void *base, size_t nmemb, size_t size,
1052               int(*compar)(const void *, const void *));
1053#define qsort git_qsort
1054#endif
1055
1056#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
1057static inline void sane_qsort(void *base, size_t nmemb, size_t size,
1058                              int(*compar)(const void *, const void *))
1059{
1060        if (nmemb > 1)
1061                qsort(base, nmemb, size, compar);
1062}
1063
1064#ifndef HAVE_ISO_QSORT_S
1065int git_qsort_s(void *base, size_t nmemb, size_t size,
1066                int (*compar)(const void *, const void *, void *), void *ctx);
1067#define qsort_s git_qsort_s
1068#endif
1069
1070#define QSORT_S(base, n, compar, ctx) do {                      \
1071        if (qsort_s((base), (n), sizeof(*(base)), compar, ctx)) \
1072                die("BUG: qsort_s() failed");                   \
1073} while (0)
1074
1075#ifndef REG_STARTEND
1076#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
1077#endif
1078
1079static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
1080                              size_t nmatch, regmatch_t pmatch[], int eflags)
1081{
1082        assert(nmatch > 0 && pmatch);
1083        pmatch[0].rm_so = 0;
1084        pmatch[0].rm_eo = size;
1085        return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1086}
1087
1088#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1089# define FORCE_DIR_SET_GID S_ISGID
1090#else
1091# define FORCE_DIR_SET_GID 0
1092#endif
1093
1094#ifdef NO_NSEC
1095#undef USE_NSEC
1096#define ST_CTIME_NSEC(st) 0
1097#define ST_MTIME_NSEC(st) 0
1098#else
1099#ifdef USE_ST_TIMESPEC
1100#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1101#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1102#else
1103#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1104#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1105#endif
1106#endif
1107
1108#ifdef UNRELIABLE_FSTAT
1109#define fstat_is_reliable() 0
1110#else
1111#define fstat_is_reliable() 1
1112#endif
1113
1114#ifndef va_copy
1115/*
1116 * Since an obvious implementation of va_list would be to make it a
1117 * pointer into the stack frame, a simple assignment will work on
1118 * many systems.  But let's try to be more portable.
1119 */
1120#ifdef __va_copy
1121#define va_copy(dst, src) __va_copy(dst, src)
1122#else
1123#define va_copy(dst, src) ((dst) = (src))
1124#endif
1125#endif
1126
1127#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1128#define HAVE_VARIADIC_MACROS 1
1129#endif
1130
1131#ifdef HAVE_VARIADIC_MACROS
1132__attribute__((format (printf, 3, 4))) NORETURN
1133void BUG_fl(const char *file, int line, const char *fmt, ...);
1134#define BUG(...) BUG_fl(__FILE__, __LINE__, __VA_ARGS__)
1135#else
1136__attribute__((format (printf, 1, 2))) NORETURN
1137void BUG(const char *fmt, ...);
1138#endif
1139
1140/*
1141 * Preserves errno, prints a message, but gives no warning for ENOENT.
1142 * Returns 0 on success, which includes trying to unlink an object that does
1143 * not exist.
1144 */
1145int unlink_or_warn(const char *path);
1146 /*
1147  * Tries to unlink file.  Returns 0 if unlink succeeded
1148  * or the file already didn't exist.  Returns -1 and
1149  * appends a message to err suitable for
1150  * 'error("%s", err->buf)' on error.
1151  */
1152int unlink_or_msg(const char *file, struct strbuf *err);
1153/*
1154 * Preserves errno, prints a message, but gives no warning for ENOENT.
1155 * Returns 0 on success, which includes trying to remove a directory that does
1156 * not exist.
1157 */
1158int rmdir_or_warn(const char *path);
1159/*
1160 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1161 * the supplied file mode.
1162 */
1163int remove_or_warn(unsigned int mode, const char *path);
1164
1165/*
1166 * Call access(2), but warn for any error except "missing file"
1167 * (ENOENT or ENOTDIR).
1168 */
1169#define ACCESS_EACCES_OK (1U << 0)
1170int access_or_warn(const char *path, int mode, unsigned flag);
1171int access_or_die(const char *path, int mode, unsigned flag);
1172
1173/* Warn on an inaccessible file if errno indicates this is an error */
1174int warn_on_fopen_errors(const char *path);
1175
1176#ifdef GMTIME_UNRELIABLE_ERRORS
1177struct tm *git_gmtime(const time_t *);
1178struct tm *git_gmtime_r(const time_t *, struct tm *);
1179#define gmtime git_gmtime
1180#define gmtime_r git_gmtime_r
1181#endif
1182
1183#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1184#define USE_PARENS_AROUND_GETTEXT_N 1
1185#endif
1186
1187#ifndef SHELL_PATH
1188# define SHELL_PATH "/bin/sh"
1189#endif
1190
1191#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1192#define flockfile(fh)
1193#define funlockfile(fh)
1194#define getc_unlocked(fh) getc(fh)
1195#endif
1196
1197/*
1198 * Our code often opens a path to an optional file, to work on its
1199 * contents when we can successfully open it.  We can ignore a failure
1200 * to open if such an optional file does not exist, but we do want to
1201 * report a failure in opening for other reasons (e.g. we got an I/O
1202 * error, or the file is there, but we lack the permission to open).
1203 *
1204 * Call this function after seeing an error from open() or fopen() to
1205 * see if the errno indicates a missing file that we can safely ignore.
1206 */
1207static inline int is_missing_file_error(int errno_)
1208{
1209        return (errno_ == ENOENT || errno_ == ENOTDIR);
1210}
1211
1212extern int cmd_main(int, const char **);
1213
1214/*
1215 * You can mark a stack variable with UNLEAK(var) to avoid it being
1216 * reported as a leak by tools like LSAN or valgrind. The argument
1217 * should generally be the variable itself (not its address and not what
1218 * it points to). It's safe to use this on pointers which may already
1219 * have been freed, or on pointers which may still be in use.
1220 *
1221 * Use this _only_ for a variable that leaks by going out of scope at
1222 * program exit (so only from cmd_* functions or their direct helpers).
1223 * Normal functions, especially those which may be called multiple
1224 * times, should actually free their memory. This is only meant as
1225 * an annotation, and does nothing in non-leak-checking builds.
1226 */
1227#ifdef SUPPRESS_ANNOTATED_LEAKS
1228extern void unleak_memory(const void *ptr, size_t len);
1229#define UNLEAK(var) unleak_memory(&(var), sizeof(var))
1230#else
1231#define UNLEAK(var) do {} while (0)
1232#endif
1233
1234#endif