Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Seventh batch for 2.12 (4e59582)
   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(__MINGW32__)
 193/* pull in Windows compatibility stuff */
 194#include "compat/mingw.h"
 195#elif defined(_MSC_VER)
 196#include "compat/msvc.h"
 197#else
 198#include <sys/utsname.h>
 199#include <sys/wait.h>
 200#include <sys/resource.h>
 201#include <sys/socket.h>
 202#include <sys/ioctl.h>
 203#include <termios.h>
 204#ifndef NO_SYS_SELECT_H
 205#include <sys/select.h>
 206#endif
 207#include <netinet/in.h>
 208#include <netinet/tcp.h>
 209#include <arpa/inet.h>
 210#include <netdb.h>
 211#include <pwd.h>
 212#include <sys/un.h>
 213#ifndef NO_INTTYPES_H
 214#include <inttypes.h>
 215#else
 216#include <stdint.h>
 217#endif
 218#ifdef NO_INTPTR_T
 219/*
 220 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 221 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 222 * while on IP16 and IP16L32 it is "int" (resp. "short")
 223 * Size needs to match (or exceed) 'sizeof(void *)'.
 224 * We can't take "long long" here as not everybody has it.
 225 */
 226typedef long intptr_t;
 227typedef unsigned long uintptr_t;
 228#endif
 229#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 230#include <grp.h>
 231#define _ALL_SOURCE 1
 232#endif
 233
 234/* used on Mac OS X */
 235#ifdef PRECOMPOSE_UNICODE
 236#include "compat/precompose_utf8.h"
 237#else
 238#define precompose_str(in,i_nfd2nfc)
 239#define precompose_argv(c,v)
 240#define probe_utf8_pathname_composition()
 241#endif
 242
 243#ifdef MKDIR_WO_TRAILING_SLASH
 244#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 245extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 246#endif
 247
 248#ifdef NO_STRUCT_ITIMERVAL
 249struct itimerval {
 250        struct timeval it_interval;
 251        struct timeval it_value;
 252};
 253#endif
 254
 255#ifdef NO_SETITIMER
 256#define setitimer(which,value,ovalue)
 257#endif
 258
 259#ifndef NO_LIBGEN_H
 260#include <libgen.h>
 261#else
 262#define basename gitbasename
 263extern char *gitbasename(char *);
 264#define dirname gitdirname
 265extern char *gitdirname(char *);
 266#endif
 267
 268#ifndef NO_ICONV
 269#include <iconv.h>
 270#endif
 271
 272#ifndef NO_OPENSSL
 273#ifdef __APPLE__
 274#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 275#include <AvailabilityMacros.h>
 276#undef DEPRECATED_ATTRIBUTE
 277#define DEPRECATED_ATTRIBUTE
 278#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 279#endif
 280#include <openssl/ssl.h>
 281#include <openssl/err.h>
 282#endif
 283
 284/* On most systems <netdb.h> would have given us this, but
 285 * not on some systems (e.g. z/OS).
 286 */
 287#ifndef NI_MAXHOST
 288#define NI_MAXHOST 1025
 289#endif
 290
 291#ifndef NI_MAXSERV
 292#define NI_MAXSERV 32
 293#endif
 294
 295/* On most systems <limits.h> would have given us this, but
 296 * not on some systems (e.g. GNU/Hurd).
 297 */
 298#ifndef PATH_MAX
 299#define PATH_MAX 4096
 300#endif
 301
 302#ifndef PRIuMAX
 303#define PRIuMAX "llu"
 304#endif
 305
 306#ifndef SCNuMAX
 307#define SCNuMAX PRIuMAX
 308#endif
 309
 310#ifndef PRIu32
 311#define PRIu32 "u"
 312#endif
 313
 314#ifndef PRIx32
 315#define PRIx32 "x"
 316#endif
 317
 318#ifndef PRIo32
 319#define PRIo32 "o"
 320#endif
 321
 322#ifndef PATH_SEP
 323#define PATH_SEP ':'
 324#endif
 325
 326#ifdef HAVE_PATHS_H
 327#include <paths.h>
 328#endif
 329#ifndef _PATH_DEFPATH
 330#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 331#endif
 332
 333#ifndef has_dos_drive_prefix
 334static inline int git_has_dos_drive_prefix(const char *path)
 335{
 336        return 0;
 337}
 338#define has_dos_drive_prefix git_has_dos_drive_prefix
 339#endif
 340
 341#ifndef skip_dos_drive_prefix
 342static inline int git_skip_dos_drive_prefix(char **path)
 343{
 344        return 0;
 345}
 346#define skip_dos_drive_prefix git_skip_dos_drive_prefix
 347#endif
 348
 349#ifndef is_dir_sep
 350static inline int git_is_dir_sep(int c)
 351{
 352        return c == '/';
 353}
 354#define is_dir_sep git_is_dir_sep
 355#endif
 356
 357#ifndef offset_1st_component
 358static inline int git_offset_1st_component(const char *path)
 359{
 360        return is_dir_sep(path[0]);
 361}
 362#define offset_1st_component git_offset_1st_component
 363#endif
 364
 365#ifndef find_last_dir_sep
 366static inline char *git_find_last_dir_sep(const char *path)
 367{
 368        return strrchr(path, '/');
 369}
 370#define find_last_dir_sep git_find_last_dir_sep
 371#endif
 372
 373#if defined(__HP_cc) && (__HP_cc >= 61000)
 374#define NORETURN __attribute__((noreturn))
 375#define NORETURN_PTR
 376#elif defined(__GNUC__) && !defined(NO_NORETURN)
 377#define NORETURN __attribute__((__noreturn__))
 378#define NORETURN_PTR __attribute__((__noreturn__))
 379#elif defined(_MSC_VER)
 380#define NORETURN __declspec(noreturn)
 381#define NORETURN_PTR
 382#else
 383#define NORETURN
 384#define NORETURN_PTR
 385#ifndef __GNUC__
 386#ifndef __attribute__
 387#define __attribute__(x)
 388#endif
 389#endif
 390#endif
 391
 392/* The sentinel attribute is valid from gcc version 4.0 */
 393#if defined(__GNUC__) && (__GNUC__ >= 4)
 394#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 395#else
 396#define LAST_ARG_MUST_BE_NULL
 397#endif
 398
 399#include "compat/bswap.h"
 400
 401#include "wildmatch.h"
 402
 403struct strbuf;
 404
 405/* General helper functions */
 406extern void vreportf(const char *prefix, const char *err, va_list params);
 407extern NORETURN void usage(const char *err);
 408extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 409extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 410extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 411extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 412extern int error_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 413extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 414extern void warning_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 415
 416#ifndef NO_OPENSSL
 417#ifdef APPLE_COMMON_CRYPTO
 418#include "compat/apple-common-crypto.h"
 419#else
 420#include <openssl/evp.h>
 421#include <openssl/hmac.h>
 422#endif /* APPLE_COMMON_CRYPTO */
 423#include <openssl/x509v3.h>
 424#endif /* NO_OPENSSL */
 425
 426/*
 427 * Let callers be aware of the constant return value; this can help
 428 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 429 * because some compilers may not support variadic macros. Since we're only
 430 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 431 * using the function as usual.
 432 */
 433#if defined(__GNUC__)
 434static inline int const_error(void)
 435{
 436        return -1;
 437}
 438#define error(...) (error(__VA_ARGS__), const_error())
 439#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 440#endif
 441
 442extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 443extern void set_error_routine(void (*routine)(const char *err, va_list params));
 444extern void (*get_error_routine(void))(const char *err, va_list params);
 445extern void set_warn_routine(void (*routine)(const char *warn, va_list params));
 446extern void (*get_warn_routine(void))(const char *warn, va_list params);
 447extern void set_die_is_recursing_routine(int (*routine)(void));
 448extern void set_error_handle(FILE *);
 449
 450extern int starts_with(const char *str, const char *prefix);
 451
 452/*
 453 * If the string "str" begins with the string found in "prefix", return 1.
 454 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 455 * the string right after the prefix).
 456 *
 457 * Otherwise, return 0 and leave "out" untouched.
 458 *
 459 * Examples:
 460 *
 461 *   [extract branch name, fail if not a branch]
 462 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 463 *      return -1;
 464 *
 465 *   [skip prefix if present, otherwise use whole string]
 466 *   skip_prefix(name, "refs/heads/", &name);
 467 */
 468static inline int skip_prefix(const char *str, const char *prefix,
 469                              const char **out)
 470{
 471        do {
 472                if (!*prefix) {
 473                        *out = str;
 474                        return 1;
 475                }
 476        } while (*str++ == *prefix++);
 477        return 0;
 478}
 479
 480/*
 481 * Like skip_prefix, but promises never to read past "len" bytes of the input
 482 * buffer, and returns the remaining number of bytes in "out" via "outlen".
 483 */
 484static inline int skip_prefix_mem(const char *buf, size_t len,
 485                                  const char *prefix,
 486                                  const char **out, size_t *outlen)
 487{
 488        size_t prefix_len = strlen(prefix);
 489        if (prefix_len <= len && !memcmp(buf, prefix, prefix_len)) {
 490                *out = buf + prefix_len;
 491                *outlen = len - prefix_len;
 492                return 1;
 493        }
 494        return 0;
 495}
 496
 497/*
 498 * If buf ends with suffix, return 1 and subtract the length of the suffix
 499 * from *len. Otherwise, return 0 and leave *len untouched.
 500 */
 501static inline int strip_suffix_mem(const char *buf, size_t *len,
 502                                   const char *suffix)
 503{
 504        size_t suflen = strlen(suffix);
 505        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 506                return 0;
 507        *len -= suflen;
 508        return 1;
 509}
 510
 511/*
 512 * If str ends with suffix, return 1 and set *len to the size of the string
 513 * without the suffix. Otherwise, return 0 and set *len to the size of the
 514 * string.
 515 *
 516 * Note that we do _not_ NUL-terminate str to the new length.
 517 */
 518static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 519{
 520        *len = strlen(str);
 521        return strip_suffix_mem(str, len, suffix);
 522}
 523
 524static inline int ends_with(const char *str, const char *suffix)
 525{
 526        size_t len;
 527        return strip_suffix(str, suffix, &len);
 528}
 529
 530#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 531
 532#ifndef PROT_READ
 533#define PROT_READ 1
 534#define PROT_WRITE 2
 535#define MAP_PRIVATE 1
 536#endif
 537
 538#define mmap git_mmap
 539#define munmap git_munmap
 540extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 541extern int git_munmap(void *start, size_t length);
 542
 543#else /* NO_MMAP || USE_WIN32_MMAP */
 544
 545#include <sys/mman.h>
 546
 547#endif /* NO_MMAP || USE_WIN32_MMAP */
 548
 549#ifdef NO_MMAP
 550
 551/* This value must be multiple of (pagesize * 2) */
 552#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 553
 554#else /* NO_MMAP */
 555
 556/* This value must be multiple of (pagesize * 2) */
 557#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 558        (sizeof(void*) >= 8 \
 559                ?  1 * 1024 * 1024 * 1024 \
 560                : 32 * 1024 * 1024)
 561
 562#endif /* NO_MMAP */
 563
 564#ifndef MAP_FAILED
 565#define MAP_FAILED ((void *)-1)
 566#endif
 567
 568#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 569#define on_disk_bytes(st) ((st).st_size)
 570#else
 571#define on_disk_bytes(st) ((st).st_blocks * 512)
 572#endif
 573
 574#ifdef NEEDS_MODE_TRANSLATION
 575#undef S_IFMT
 576#undef S_IFREG
 577#undef S_IFDIR
 578#undef S_IFLNK
 579#undef S_IFBLK
 580#undef S_IFCHR
 581#undef S_IFIFO
 582#undef S_IFSOCK
 583#define S_IFMT   0170000
 584#define S_IFREG  0100000
 585#define S_IFDIR  0040000
 586#define S_IFLNK  0120000
 587#define S_IFBLK  0060000
 588#define S_IFCHR  0020000
 589#define S_IFIFO  0010000
 590#define S_IFSOCK 0140000
 591#ifdef stat
 592#undef stat
 593#endif
 594#define stat(path, buf) git_stat(path, buf)
 595extern int git_stat(const char *, struct stat *);
 596#ifdef fstat
 597#undef fstat
 598#endif
 599#define fstat(fd, buf) git_fstat(fd, buf)
 600extern int git_fstat(int, struct stat *);
 601#ifdef lstat
 602#undef lstat
 603#endif
 604#define lstat(path, buf) git_lstat(path, buf)
 605extern int git_lstat(const char *, struct stat *);
 606#endif
 607
 608#define DEFAULT_PACKED_GIT_LIMIT \
 609        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 610
 611#ifdef NO_PREAD
 612#define pread git_pread
 613extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 614#endif
 615/*
 616 * Forward decl that will remind us if its twin in cache.h changes.
 617 * This function is used in compat/pread.c.  But we can't include
 618 * cache.h there.
 619 */
 620extern ssize_t read_in_full(int fd, void *buf, size_t count);
 621
 622#ifdef NO_SETENV
 623#define setenv gitsetenv
 624extern int gitsetenv(const char *, const char *, int);
 625#endif
 626
 627#ifdef NO_MKDTEMP
 628#define mkdtemp gitmkdtemp
 629extern char *gitmkdtemp(char *);
 630#endif
 631
 632#ifdef NO_MKSTEMPS
 633#define mkstemps gitmkstemps
 634extern int gitmkstemps(char *, int);
 635#endif
 636
 637#ifdef NO_UNSETENV
 638#define unsetenv gitunsetenv
 639extern void gitunsetenv(const char *);
 640#endif
 641
 642#ifdef NO_STRCASESTR
 643#define strcasestr gitstrcasestr
 644extern char *gitstrcasestr(const char *haystack, const char *needle);
 645#endif
 646
 647#ifdef NO_STRLCPY
 648#define strlcpy gitstrlcpy
 649extern size_t gitstrlcpy(char *, const char *, size_t);
 650#endif
 651
 652#ifdef NO_STRTOUMAX
 653#define strtoumax gitstrtoumax
 654extern uintmax_t gitstrtoumax(const char *, char **, int);
 655#define strtoimax gitstrtoimax
 656extern intmax_t gitstrtoimax(const char *, char **, int);
 657#endif
 658
 659#ifdef NO_HSTRERROR
 660#define hstrerror githstrerror
 661extern const char *githstrerror(int herror);
 662#endif
 663
 664#ifdef NO_MEMMEM
 665#define memmem gitmemmem
 666void *gitmemmem(const void *haystack, size_t haystacklen,
 667                const void *needle, size_t needlelen);
 668#endif
 669
 670#ifdef OVERRIDE_STRDUP
 671#ifdef strdup
 672#undef strdup
 673#endif
 674#define strdup gitstrdup
 675char *gitstrdup(const char *s);
 676#endif
 677
 678#ifdef NO_GETPAGESIZE
 679#define getpagesize() sysconf(_SC_PAGESIZE)
 680#endif
 681
 682#ifndef O_CLOEXEC
 683#define O_CLOEXEC 0
 684#endif
 685
 686#ifdef FREAD_READS_DIRECTORIES
 687#ifdef fopen
 688#undef fopen
 689#endif
 690#define fopen(a,b) git_fopen(a,b)
 691extern FILE *git_fopen(const char*, const char*);
 692#endif
 693
 694#ifdef SNPRINTF_RETURNS_BOGUS
 695#ifdef snprintf
 696#undef snprintf
 697#endif
 698#define snprintf git_snprintf
 699extern int git_snprintf(char *str, size_t maxsize,
 700                        const char *format, ...);
 701#ifdef vsnprintf
 702#undef vsnprintf
 703#endif
 704#define vsnprintf git_vsnprintf
 705extern int git_vsnprintf(char *str, size_t maxsize,
 706                         const char *format, va_list ap);
 707#endif
 708
 709#ifdef __GLIBC_PREREQ
 710#if __GLIBC_PREREQ(2, 1)
 711#define HAVE_STRCHRNUL
 712#endif
 713#endif
 714
 715#ifndef HAVE_STRCHRNUL
 716#define strchrnul gitstrchrnul
 717static inline char *gitstrchrnul(const char *s, int c)
 718{
 719        while (*s && *s != c)
 720                s++;
 721        return (char *)s;
 722}
 723#endif
 724
 725#ifdef NO_INET_PTON
 726int inet_pton(int af, const char *src, void *dst);
 727#endif
 728
 729#ifdef NO_INET_NTOP
 730const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 731#endif
 732
 733#ifdef NO_PTHREADS
 734#define atexit git_atexit
 735extern int git_atexit(void (*handler)(void));
 736#endif
 737
 738extern void release_pack_memory(size_t);
 739
 740typedef void (*try_to_free_t)(size_t);
 741extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 742
 743static inline size_t st_add(size_t a, size_t b)
 744{
 745        if (unsigned_add_overflows(a, b))
 746                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 747                    (uintmax_t)a, (uintmax_t)b);
 748        return a + b;
 749}
 750#define st_add3(a,b,c)   st_add(st_add((a),(b)),(c))
 751#define st_add4(a,b,c,d) st_add(st_add3((a),(b),(c)),(d))
 752
 753static inline size_t st_mult(size_t a, size_t b)
 754{
 755        if (unsigned_mult_overflows(a, b))
 756                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 757                    (uintmax_t)a, (uintmax_t)b);
 758        return a * b;
 759}
 760
 761static inline size_t st_sub(size_t a, size_t b)
 762{
 763        if (a < b)
 764                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 765                    (uintmax_t)a, (uintmax_t)b);
 766        return a - b;
 767}
 768
 769#ifdef HAVE_ALLOCA_H
 770# include <alloca.h>
 771# define xalloca(size)      (alloca(size))
 772# define xalloca_free(p)    do {} while (0)
 773#else
 774# define xalloca(size)      (xmalloc(size))
 775# define xalloca_free(p)    (free(p))
 776#endif
 777extern char *xstrdup(const char *str);
 778extern void *xmalloc(size_t size);
 779extern void *xmallocz(size_t size);
 780extern void *xmallocz_gently(size_t size);
 781extern void *xmemdupz(const void *data, size_t len);
 782extern char *xstrndup(const char *str, size_t len);
 783extern void *xrealloc(void *ptr, size_t size);
 784extern void *xcalloc(size_t nmemb, size_t size);
 785extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 786extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 787extern int xopen(const char *path, int flags, ...);
 788extern ssize_t xread(int fd, void *buf, size_t len);
 789extern ssize_t xwrite(int fd, const void *buf, size_t len);
 790extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 791extern int xdup(int fd);
 792extern FILE *xfopen(const char *path, const char *mode);
 793extern FILE *xfdopen(int fd, const char *mode);
 794extern int xmkstemp(char *template);
 795extern int xmkstemp_mode(char *template, int mode);
 796extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 797extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 798extern char *xgetcwd(void);
 799extern FILE *fopen_for_writing(const char *path);
 800
 801#define ALLOC_ARRAY(x, alloc) (x) = xmalloc(st_mult(sizeof(*(x)), (alloc)))
 802#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), st_mult(sizeof(*(x)), (alloc)))
 803
 804#define COPY_ARRAY(dst, src, n) copy_array((dst), (src), (n), sizeof(*(dst)) + \
 805        BUILD_ASSERT_OR_ZERO(sizeof(*(dst)) == sizeof(*(src))))
 806static inline void copy_array(void *dst, const void *src, size_t n, size_t size)
 807{
 808        if (n)
 809                memcpy(dst, src, st_mult(size, n));
 810}
 811
 812/*
 813 * These functions help you allocate structs with flex arrays, and copy
 814 * the data directly into the array. For example, if you had:
 815 *
 816 *   struct foo {
 817 *     int bar;
 818 *     char name[FLEX_ARRAY];
 819 *   };
 820 *
 821 * you can do:
 822 *
 823 *   struct foo *f;
 824 *   FLEX_ALLOC_MEM(f, name, src, len);
 825 *
 826 * to allocate a "foo" with the contents of "src" in the "name" field.
 827 * The resulting struct is automatically zero'd, and the flex-array field
 828 * is NUL-terminated (whether the incoming src buffer was or not).
 829 *
 830 * The FLEXPTR_* variants operate on structs that don't use flex-arrays,
 831 * but do want to store a pointer to some extra data in the same allocated
 832 * block. For example, if you have:
 833 *
 834 *   struct foo {
 835 *     char *name;
 836 *     int bar;
 837 *   };
 838 *
 839 * you can do:
 840 *
 841 *   struct foo *f;
 842 *   FLEXPTR_ALLOC_STR(f, name, src);
 843 *
 844 * and "name" will point to a block of memory after the struct, which will be
 845 * freed along with the struct (but the pointer can be repointed anywhere).
 846 *
 847 * The *_STR variants accept a string parameter rather than a ptr/len
 848 * combination.
 849 *
 850 * Note that these macros will evaluate the first parameter multiple
 851 * times, and it must be assignable as an lvalue.
 852 */
 853#define FLEX_ALLOC_MEM(x, flexname, buf, len) do { \
 854        size_t flex_array_len_ = (len); \
 855        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 856        memcpy((void *)(x)->flexname, (buf), flex_array_len_); \
 857} while (0)
 858#define FLEXPTR_ALLOC_MEM(x, ptrname, buf, len) do { \
 859        size_t flex_array_len_ = (len); \
 860        (x) = xcalloc(1, st_add3(sizeof(*(x)), flex_array_len_, 1)); \
 861        memcpy((x) + 1, (buf), flex_array_len_); \
 862        (x)->ptrname = (void *)((x)+1); \
 863} while(0)
 864#define FLEX_ALLOC_STR(x, flexname, str) \
 865        FLEX_ALLOC_MEM((x), flexname, (str), strlen(str))
 866#define FLEXPTR_ALLOC_STR(x, ptrname, str) \
 867        FLEXPTR_ALLOC_MEM((x), ptrname, (str), strlen(str))
 868
 869static inline char *xstrdup_or_null(const char *str)
 870{
 871        return str ? xstrdup(str) : NULL;
 872}
 873
 874static inline size_t xsize_t(off_t len)
 875{
 876        if (len > (size_t) len)
 877                die("Cannot handle files this big");
 878        return (size_t)len;
 879}
 880
 881__attribute__((format (printf, 3, 4)))
 882extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 883
 884/* in ctype.c, for kwset users */
 885extern const unsigned char tolower_trans_tbl[256];
 886
 887/* Sane ctype - no locale, and works with signed chars */
 888#undef isascii
 889#undef isspace
 890#undef isdigit
 891#undef isalpha
 892#undef isalnum
 893#undef isprint
 894#undef islower
 895#undef isupper
 896#undef tolower
 897#undef toupper
 898#undef iscntrl
 899#undef ispunct
 900#undef isxdigit
 901
 902extern const unsigned char sane_ctype[256];
 903#define GIT_SPACE 0x01
 904#define GIT_DIGIT 0x02
 905#define GIT_ALPHA 0x04
 906#define GIT_GLOB_SPECIAL 0x08
 907#define GIT_REGEX_SPECIAL 0x10
 908#define GIT_PATHSPEC_MAGIC 0x20
 909#define GIT_CNTRL 0x40
 910#define GIT_PUNCT 0x80
 911#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 912#define isascii(x) (((x) & ~0x7f) == 0)
 913#define isspace(x) sane_istest(x,GIT_SPACE)
 914#define isdigit(x) sane_istest(x,GIT_DIGIT)
 915#define isalpha(x) sane_istest(x,GIT_ALPHA)
 916#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 917#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 918#define islower(x) sane_iscase(x, 1)
 919#define isupper(x) sane_iscase(x, 0)
 920#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 921#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 922#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 923#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 924                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 925#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 926#define tolower(x) sane_case((unsigned char)(x), 0x20)
 927#define toupper(x) sane_case((unsigned char)(x), 0)
 928#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 929
 930static inline int sane_case(int x, int high)
 931{
 932        if (sane_istest(x, GIT_ALPHA))
 933                x = (x & ~0x20) | high;
 934        return x;
 935}
 936
 937static inline int sane_iscase(int x, int is_lower)
 938{
 939        if (!sane_istest(x, GIT_ALPHA))
 940                return 0;
 941
 942        if (is_lower)
 943                return (x & 0x20) != 0;
 944        else
 945                return (x & 0x20) == 0;
 946}
 947
 948static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 949{
 950        unsigned long ul;
 951        char *p;
 952
 953        errno = 0;
 954        /* negative values would be accepted by strtoul */
 955        if (strchr(s, '-'))
 956                return -1;
 957        ul = strtoul(s, &p, base);
 958        if (errno || *p || p == s || (unsigned int) ul != ul)
 959                return -1;
 960        *result = ul;
 961        return 0;
 962}
 963
 964static inline int strtol_i(char const *s, int base, int *result)
 965{
 966        long ul;
 967        char *p;
 968
 969        errno = 0;
 970        ul = strtol(s, &p, base);
 971        if (errno || *p || p == s || (int) ul != ul)
 972                return -1;
 973        *result = ul;
 974        return 0;
 975}
 976
 977#ifdef INTERNAL_QSORT
 978void git_qsort(void *base, size_t nmemb, size_t size,
 979               int(*compar)(const void *, const void *));
 980#define qsort git_qsort
 981#endif
 982
 983#define QSORT(base, n, compar) sane_qsort((base), (n), sizeof(*(base)), compar)
 984static inline void sane_qsort(void *base, size_t nmemb, size_t size,
 985                              int(*compar)(const void *, const void *))
 986{
 987        if (nmemb > 1)
 988                qsort(base, nmemb, size, compar);
 989}
 990
 991#ifndef REG_STARTEND
 992#error "Git requires REG_STARTEND support. Compile with NO_REGEX=NeedsStartEnd"
 993#endif
 994
 995static inline int regexec_buf(const regex_t *preg, const char *buf, size_t size,
 996                              size_t nmatch, regmatch_t pmatch[], int eflags)
 997{
 998        assert(nmatch > 0 && pmatch);
 999        pmatch[0].rm_so = 0;
1000        pmatch[0].rm_eo = size;
1001        return regexec(preg, buf, nmatch, pmatch, eflags | REG_STARTEND);
1002}
1003
1004#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
1005# define FORCE_DIR_SET_GID S_ISGID
1006#else
1007# define FORCE_DIR_SET_GID 0
1008#endif
1009
1010#ifdef NO_NSEC
1011#undef USE_NSEC
1012#define ST_CTIME_NSEC(st) 0
1013#define ST_MTIME_NSEC(st) 0
1014#else
1015#ifdef USE_ST_TIMESPEC
1016#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
1017#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
1018#else
1019#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
1020#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
1021#endif
1022#endif
1023
1024#ifdef UNRELIABLE_FSTAT
1025#define fstat_is_reliable() 0
1026#else
1027#define fstat_is_reliable() 1
1028#endif
1029
1030#ifndef va_copy
1031/*
1032 * Since an obvious implementation of va_list would be to make it a
1033 * pointer into the stack frame, a simple assignment will work on
1034 * many systems.  But let's try to be more portable.
1035 */
1036#ifdef __va_copy
1037#define va_copy(dst, src) __va_copy(dst, src)
1038#else
1039#define va_copy(dst, src) ((dst) = (src))
1040#endif
1041#endif
1042
1043#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
1044#define HAVE_VARIADIC_MACROS 1
1045#endif
1046
1047/*
1048 * Preserves errno, prints a message, but gives no warning for ENOENT.
1049 * Returns 0 on success, which includes trying to unlink an object that does
1050 * not exist.
1051 */
1052int unlink_or_warn(const char *path);
1053 /*
1054  * Tries to unlink file.  Returns 0 if unlink succeeded
1055  * or the file already didn't exist.  Returns -1 and
1056  * appends a message to err suitable for
1057  * 'error("%s", err->buf)' on error.
1058  */
1059int unlink_or_msg(const char *file, struct strbuf *err);
1060/*
1061 * Preserves errno, prints a message, but gives no warning for ENOENT.
1062 * Returns 0 on success, which includes trying to remove a directory that does
1063 * not exist.
1064 */
1065int rmdir_or_warn(const char *path);
1066/*
1067 * Calls the correct function out of {unlink,rmdir}_or_warn based on
1068 * the supplied file mode.
1069 */
1070int remove_or_warn(unsigned int mode, const char *path);
1071
1072/*
1073 * Call access(2), but warn for any error except "missing file"
1074 * (ENOENT or ENOTDIR).
1075 */
1076#define ACCESS_EACCES_OK (1U << 0)
1077int access_or_warn(const char *path, int mode, unsigned flag);
1078int access_or_die(const char *path, int mode, unsigned flag);
1079
1080/* Warn on an inaccessible file that ought to be accessible */
1081void warn_on_inaccessible(const char *path);
1082
1083#ifdef GMTIME_UNRELIABLE_ERRORS
1084struct tm *git_gmtime(const time_t *);
1085struct tm *git_gmtime_r(const time_t *, struct tm *);
1086#define gmtime git_gmtime
1087#define gmtime_r git_gmtime_r
1088#endif
1089
1090#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
1091#define USE_PARENS_AROUND_GETTEXT_N 1
1092#endif
1093
1094#ifndef SHELL_PATH
1095# define SHELL_PATH "/bin/sh"
1096#endif
1097
1098#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
1099#define flockfile(fh)
1100#define funlockfile(fh)
1101#define getc_unlocked(fh) getc(fh)
1102#endif
1103
1104extern int cmd_main(int, const char **);
1105
1106#endif