Andrew's git - gitweb.git/blob

7fad5aad9f4909d1120dfba5ffb958ddd831d2fa
   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 defined(__GNUC__) && (__GNUC__ >= 3)
  62# if GIT_GNUC_PREREQ(3, 1)
  63 /* &arr[0] degrades to a pointer: a different type from an array */
  64# define BARF_UNLESS_AN_ARRAY(arr)                                              \
  65        BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
  66                                                           __typeof__(&(arr)[0])))
  67# else
  68#  define BARF_UNLESS_AN_ARRAY(arr) 0
  69# endif
  70#endif
  71/*
  72 * ARRAY_SIZE - get the number of elements in a visible array
  73 *  <at> x: the array whose size you want.
  74 *
  75 * This does not work on pointers, or arrays declared as [], or
  76 * function parameters.  With correct compiler support, such usage
  77 * will cause a build error (see the build_assert_or_zero macro).
  78 */
  79#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
  80
  81#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  82
  83#define maximum_signed_value_of_type(a) \
  84    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  85
  86#define maximum_unsigned_value_of_type(a) \
  87    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  88
  89/*
  90 * Signed integer overflow is undefined in C, so here's a helper macro
  91 * to detect if the sum of two integers will overflow.
  92 *
  93 * Requires: a >= 0, typeof(a) equals typeof(b)
  94 */
  95#define signed_add_overflows(a, b) \
  96    ((b) > maximum_signed_value_of_type(a) - (a))
  97
  98#define unsigned_add_overflows(a, b) \
  99    ((b) > maximum_unsigned_value_of_type(a) - (a))
 100
 101#ifdef __GNUC__
 102#define TYPEOF(x) (__typeof__(x))
 103#else
 104#define TYPEOF(x)
 105#endif
 106
 107#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 108#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 109
 110#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 111
 112/* Approximation of the length of the decimal representation of this type. */
 113#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 114
 115#if defined(__sun__)
 116 /*
 117  * On Solaris, when _XOPEN_EXTENDED is set, its header file
 118  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 119  * setting to say we are XPG5 or XPG6.  Also on Solaris,
 120  * XPG6 programs must be compiled with a c99 compiler, while
 121  * non XPG6 programs must be compiled with a pre-c99 compiler.
 122  */
 123# if __STDC_VERSION__ - 0 >= 199901L
 124# define _XOPEN_SOURCE 600
 125# else
 126# define _XOPEN_SOURCE 500
 127# endif
 128#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 129      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 130      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__)
 131#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 132#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 133#endif
 134#define _ALL_SOURCE 1
 135#define _GNU_SOURCE 1
 136#define _BSD_SOURCE 1
 137#define _DEFAULT_SOURCE 1
 138#define _NETBSD_SOURCE 1
 139#define _SGI_SOURCE 1
 140
 141#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 142# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 143#  define _WIN32_WINNT 0x0502
 144# endif
 145#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 146#include <winsock2.h>
 147#include <windows.h>
 148#define GIT_WINDOWS_NATIVE
 149#endif
 150
 151#include <unistd.h>
 152#include <stdio.h>
 153#include <sys/stat.h>
 154#include <fcntl.h>
 155#include <stddef.h>
 156#include <stdlib.h>
 157#include <stdarg.h>
 158#include <string.h>
 159#ifdef HAVE_STRINGS_H
 160#include <strings.h> /* for strcasecmp() */
 161#endif
 162#include <errno.h>
 163#include <limits.h>
 164#ifdef NEEDS_SYS_PARAM_H
 165#include <sys/param.h>
 166#endif
 167#include <sys/types.h>
 168#include <dirent.h>
 169#include <sys/time.h>
 170#include <time.h>
 171#include <signal.h>
 172#include <assert.h>
 173#include <regex.h>
 174#include <utime.h>
 175#include <syslog.h>
 176#ifndef NO_SYS_POLL_H
 177#include <sys/poll.h>
 178#else
 179#include <poll.h>
 180#endif
 181
 182#if defined(__MINGW32__)
 183/* pull in Windows compatibility stuff */
 184#include "compat/mingw.h"
 185#elif defined(_MSC_VER)
 186#include "compat/msvc.h"
 187#else
 188#include <sys/wait.h>
 189#include <sys/resource.h>
 190#include <sys/socket.h>
 191#include <sys/ioctl.h>
 192#include <termios.h>
 193#ifndef NO_SYS_SELECT_H
 194#include <sys/select.h>
 195#endif
 196#include <netinet/in.h>
 197#include <netinet/tcp.h>
 198#include <arpa/inet.h>
 199#include <netdb.h>
 200#include <pwd.h>
 201#include <sys/un.h>
 202#ifndef NO_INTTYPES_H
 203#include <inttypes.h>
 204#else
 205#include <stdint.h>
 206#endif
 207#ifdef NO_INTPTR_T
 208/*
 209 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 210 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 211 * while on IP16 and IP16L32 it is "int" (resp. "short")
 212 * Size needs to match (or exceed) 'sizeof(void *)'.
 213 * We can't take "long long" here as not everybody has it.
 214 */
 215typedef long intptr_t;
 216typedef unsigned long uintptr_t;
 217#endif
 218#if defined(__CYGWIN__)
 219#undef _XOPEN_SOURCE
 220#include <grp.h>
 221#define _XOPEN_SOURCE 600
 222#else
 223#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 224#include <grp.h>
 225#define _ALL_SOURCE 1
 226#endif
 227#endif
 228
 229/* used on Mac OS X */
 230#ifdef PRECOMPOSE_UNICODE
 231#include "compat/precompose_utf8.h"
 232#else
 233#define precompose_str(in,i_nfd2nfc)
 234#define precompose_argv(c,v)
 235#define probe_utf8_pathname_composition(a,b)
 236#endif
 237
 238#ifdef MKDIR_WO_TRAILING_SLASH
 239#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 240extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 241#endif
 242
 243#ifdef NO_STRUCT_ITIMERVAL
 244struct itimerval {
 245        struct timeval it_interval;
 246        struct timeval it_value;
 247};
 248#endif
 249
 250#ifdef NO_SETITIMER
 251#define setitimer(which,value,ovalue)
 252#endif
 253
 254#ifndef NO_LIBGEN_H
 255#include <libgen.h>
 256#else
 257#define basename gitbasename
 258extern char *gitbasename(char *);
 259#endif
 260
 261#ifndef NO_ICONV
 262#include <iconv.h>
 263#endif
 264
 265#ifndef NO_OPENSSL
 266#include <openssl/ssl.h>
 267#include <openssl/err.h>
 268#endif
 269
 270/* On most systems <netdb.h> would have given us this, but
 271 * not on some systems (e.g. z/OS).
 272 */
 273#ifndef NI_MAXHOST
 274#define NI_MAXHOST 1025
 275#endif
 276
 277#ifndef NI_MAXSERV
 278#define NI_MAXSERV 32
 279#endif
 280
 281/* On most systems <limits.h> would have given us this, but
 282 * not on some systems (e.g. GNU/Hurd).
 283 */
 284#ifndef PATH_MAX
 285#define PATH_MAX 4096
 286#endif
 287
 288#ifndef PRIuMAX
 289#define PRIuMAX "llu"
 290#endif
 291
 292#ifndef PRIu32
 293#define PRIu32 "u"
 294#endif
 295
 296#ifndef PRIx32
 297#define PRIx32 "x"
 298#endif
 299
 300#ifndef PRIo32
 301#define PRIo32 "o"
 302#endif
 303
 304#ifndef PATH_SEP
 305#define PATH_SEP ':'
 306#endif
 307
 308#ifdef HAVE_PATHS_H
 309#include <paths.h>
 310#endif
 311#ifndef _PATH_DEFPATH
 312#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 313#endif
 314
 315#ifndef STRIP_EXTENSION
 316#define STRIP_EXTENSION ""
 317#endif
 318
 319#ifndef has_dos_drive_prefix
 320static inline int git_has_dos_drive_prefix(const char *path)
 321{
 322        return 0;
 323}
 324#define has_dos_drive_prefix git_has_dos_drive_prefix
 325#endif
 326
 327#ifndef is_dir_sep
 328static inline int git_is_dir_sep(int c)
 329{
 330        return c == '/';
 331}
 332#define is_dir_sep git_is_dir_sep
 333#endif
 334
 335#ifndef offset_1st_component
 336static inline int git_offset_1st_component(const char *path)
 337{
 338        return is_dir_sep(path[0]);
 339}
 340#define offset_1st_component git_offset_1st_component
 341#endif
 342
 343#ifndef find_last_dir_sep
 344static inline char *git_find_last_dir_sep(const char *path)
 345{
 346        return strrchr(path, '/');
 347}
 348#define find_last_dir_sep git_find_last_dir_sep
 349#endif
 350
 351#if defined(__HP_cc) && (__HP_cc >= 61000)
 352#define NORETURN __attribute__((noreturn))
 353#define NORETURN_PTR
 354#elif defined(__GNUC__) && !defined(NO_NORETURN)
 355#define NORETURN __attribute__((__noreturn__))
 356#define NORETURN_PTR __attribute__((__noreturn__))
 357#elif defined(_MSC_VER)
 358#define NORETURN __declspec(noreturn)
 359#define NORETURN_PTR
 360#else
 361#define NORETURN
 362#define NORETURN_PTR
 363#ifndef __GNUC__
 364#ifndef __attribute__
 365#define __attribute__(x)
 366#endif
 367#endif
 368#endif
 369
 370/* The sentinel attribute is valid from gcc version 4.0 */
 371#if defined(__GNUC__) && (__GNUC__ >= 4)
 372#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 373#else
 374#define LAST_ARG_MUST_BE_NULL
 375#endif
 376
 377#include "compat/bswap.h"
 378
 379#include "wildmatch.h"
 380
 381struct strbuf;
 382
 383/* General helper functions */
 384extern void vreportf(const char *prefix, const char *err, va_list params);
 385extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 386extern NORETURN void usage(const char *err);
 387extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 388extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 389extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 390extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 391extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 392
 393#ifndef NO_OPENSSL
 394#ifdef APPLE_COMMON_CRYPTO
 395#include "compat/apple-common-crypto.h"
 396#else
 397#include <openssl/evp.h>
 398#include <openssl/hmac.h>
 399#endif /* APPLE_COMMON_CRYPTO */
 400#include <openssl/x509v3.h>
 401#endif /* NO_OPENSSL */
 402
 403/*
 404 * Let callers be aware of the constant return value; this can help
 405 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 406 * because some compilers may not support variadic macros. Since we're only
 407 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 408 * using the function as usual.
 409 */
 410#if defined(__GNUC__)
 411static inline int const_error(void)
 412{
 413        return -1;
 414}
 415#define error(...) (error(__VA_ARGS__), const_error())
 416#endif
 417
 418extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 419extern void set_error_routine(void (*routine)(const char *err, va_list params));
 420extern void set_die_is_recursing_routine(int (*routine)(void));
 421
 422extern int starts_with(const char *str, const char *prefix);
 423
 424/*
 425 * If the string "str" begins with the string found in "prefix", return 1.
 426 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 427 * the string right after the prefix).
 428 *
 429 * Otherwise, return 0 and leave "out" untouched.
 430 *
 431 * Examples:
 432 *
 433 *   [extract branch name, fail if not a branch]
 434 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 435 *      return -1;
 436 *
 437 *   [skip prefix if present, otherwise use whole string]
 438 *   skip_prefix(name, "refs/heads/", &name);
 439 */
 440static inline int skip_prefix(const char *str, const char *prefix,
 441                              const char **out)
 442{
 443        do {
 444                if (!*prefix) {
 445                        *out = str;
 446                        return 1;
 447                }
 448        } while (*str++ == *prefix++);
 449        return 0;
 450}
 451
 452/*
 453 * If buf ends with suffix, return 1 and subtract the length of the suffix
 454 * from *len. Otherwise, return 0 and leave *len untouched.
 455 */
 456static inline int strip_suffix_mem(const char *buf, size_t *len,
 457                                   const char *suffix)
 458{
 459        size_t suflen = strlen(suffix);
 460        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 461                return 0;
 462        *len -= suflen;
 463        return 1;
 464}
 465
 466/*
 467 * If str ends with suffix, return 1 and set *len to the size of the string
 468 * without the suffix. Otherwise, return 0 and set *len to the size of the
 469 * string.
 470 *
 471 * Note that we do _not_ NUL-terminate str to the new length.
 472 */
 473static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 474{
 475        *len = strlen(str);
 476        return strip_suffix_mem(str, len, suffix);
 477}
 478
 479static inline int ends_with(const char *str, const char *suffix)
 480{
 481        size_t len;
 482        return strip_suffix(str, suffix, &len);
 483}
 484
 485#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 486
 487#ifndef PROT_READ
 488#define PROT_READ 1
 489#define PROT_WRITE 2
 490#define MAP_PRIVATE 1
 491#endif
 492
 493#define mmap git_mmap
 494#define munmap git_munmap
 495extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 496extern int git_munmap(void *start, size_t length);
 497
 498#else /* NO_MMAP || USE_WIN32_MMAP */
 499
 500#include <sys/mman.h>
 501
 502#endif /* NO_MMAP || USE_WIN32_MMAP */
 503
 504#ifdef NO_MMAP
 505
 506/* This value must be multiple of (pagesize * 2) */
 507#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 508
 509#else /* NO_MMAP */
 510
 511/* This value must be multiple of (pagesize * 2) */
 512#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 513        (sizeof(void*) >= 8 \
 514                ?  1 * 1024 * 1024 * 1024 \
 515                : 32 * 1024 * 1024)
 516
 517#endif /* NO_MMAP */
 518
 519#ifndef MAP_FAILED
 520#define MAP_FAILED ((void *)-1)
 521#endif
 522
 523#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 524#define on_disk_bytes(st) ((st).st_size)
 525#else
 526#define on_disk_bytes(st) ((st).st_blocks * 512)
 527#endif
 528
 529#define DEFAULT_PACKED_GIT_LIMIT \
 530        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 531
 532#ifdef NO_PREAD
 533#define pread git_pread
 534extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 535#endif
 536/*
 537 * Forward decl that will remind us if its twin in cache.h changes.
 538 * This function is used in compat/pread.c.  But we can't include
 539 * cache.h there.
 540 */
 541extern ssize_t read_in_full(int fd, void *buf, size_t count);
 542
 543#ifdef NO_SETENV
 544#define setenv gitsetenv
 545extern int gitsetenv(const char *, const char *, int);
 546#endif
 547
 548#ifdef NO_MKDTEMP
 549#define mkdtemp gitmkdtemp
 550extern char *gitmkdtemp(char *);
 551#endif
 552
 553#ifdef NO_MKSTEMPS
 554#define mkstemps gitmkstemps
 555extern int gitmkstemps(char *, int);
 556#endif
 557
 558#ifdef NO_UNSETENV
 559#define unsetenv gitunsetenv
 560extern void gitunsetenv(const char *);
 561#endif
 562
 563#ifdef NO_STRCASESTR
 564#define strcasestr gitstrcasestr
 565extern char *gitstrcasestr(const char *haystack, const char *needle);
 566#endif
 567
 568#ifdef NO_STRLCPY
 569#define strlcpy gitstrlcpy
 570extern size_t gitstrlcpy(char *, const char *, size_t);
 571#endif
 572
 573#ifdef NO_STRTOUMAX
 574#define strtoumax gitstrtoumax
 575extern uintmax_t gitstrtoumax(const char *, char **, int);
 576#define strtoimax gitstrtoimax
 577extern intmax_t gitstrtoimax(const char *, char **, int);
 578#endif
 579
 580#ifdef NO_HSTRERROR
 581#define hstrerror githstrerror
 582extern const char *githstrerror(int herror);
 583#endif
 584
 585#ifdef NO_MEMMEM
 586#define memmem gitmemmem
 587void *gitmemmem(const void *haystack, size_t haystacklen,
 588                const void *needle, size_t needlelen);
 589#endif
 590
 591#ifdef NO_GETPAGESIZE
 592#define getpagesize() sysconf(_SC_PAGESIZE)
 593#endif
 594
 595#ifdef FREAD_READS_DIRECTORIES
 596#ifdef fopen
 597#undef fopen
 598#endif
 599#define fopen(a,b) git_fopen(a,b)
 600extern FILE *git_fopen(const char*, const char*);
 601#endif
 602
 603#ifdef SNPRINTF_RETURNS_BOGUS
 604#ifdef snprintf
 605#undef snprintf
 606#endif
 607#define snprintf git_snprintf
 608extern int git_snprintf(char *str, size_t maxsize,
 609                        const char *format, ...);
 610#ifdef vsnprintf
 611#undef vsnprintf
 612#endif
 613#define vsnprintf git_vsnprintf
 614extern int git_vsnprintf(char *str, size_t maxsize,
 615                         const char *format, va_list ap);
 616#endif
 617
 618#ifdef __GLIBC_PREREQ
 619#if __GLIBC_PREREQ(2, 1)
 620#define HAVE_STRCHRNUL
 621#define HAVE_MEMPCPY
 622#endif
 623#endif
 624
 625#ifndef HAVE_STRCHRNUL
 626#define strchrnul gitstrchrnul
 627static inline char *gitstrchrnul(const char *s, int c)
 628{
 629        while (*s && *s != c)
 630                s++;
 631        return (char *)s;
 632}
 633#endif
 634
 635#ifndef HAVE_MEMPCPY
 636#define mempcpy gitmempcpy
 637static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 638{
 639        return (char *)memcpy(dest, src, n) + n;
 640}
 641#endif
 642
 643#ifdef NO_INET_PTON
 644int inet_pton(int af, const char *src, void *dst);
 645#endif
 646
 647#ifdef NO_INET_NTOP
 648const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 649#endif
 650
 651#ifdef NO_PTHREADS
 652#define atexit git_atexit
 653extern int git_atexit(void (*handler)(void));
 654#endif
 655
 656extern void release_pack_memory(size_t);
 657
 658typedef void (*try_to_free_t)(size_t);
 659extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 660
 661#ifdef HAVE_ALLOCA_H
 662# include <alloca.h>
 663# define xalloca(size)      (alloca(size))
 664# define xalloca_free(p)    do {} while (0)
 665#else
 666# define xalloca(size)      (xmalloc(size))
 667# define xalloca_free(p)    (free(p))
 668#endif
 669extern char *xstrdup(const char *str);
 670extern void *xmalloc(size_t size);
 671extern void *xmallocz(size_t size);
 672extern void *xmallocz_gently(size_t size);
 673extern void *xmemdupz(const void *data, size_t len);
 674extern char *xstrndup(const char *str, size_t len);
 675extern void *xrealloc(void *ptr, size_t size);
 676extern void *xcalloc(size_t nmemb, size_t size);
 677extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 678extern ssize_t xread(int fd, void *buf, size_t len);
 679extern ssize_t xwrite(int fd, const void *buf, size_t len);
 680extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 681extern int xdup(int fd);
 682extern FILE *xfdopen(int fd, const char *mode);
 683extern int xmkstemp(char *template);
 684extern int xmkstemp_mode(char *template, int mode);
 685extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 686extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 687extern char *xgetcwd(void);
 688
 689#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 690
 691static inline size_t xsize_t(off_t len)
 692{
 693        if (len > (size_t) len)
 694                die("Cannot handle files this big");
 695        return (size_t)len;
 696}
 697
 698/* in ctype.c, for kwset users */
 699extern const char tolower_trans_tbl[256];
 700
 701/* Sane ctype - no locale, and works with signed chars */
 702#undef isascii
 703#undef isspace
 704#undef isdigit
 705#undef isalpha
 706#undef isalnum
 707#undef isprint
 708#undef islower
 709#undef isupper
 710#undef tolower
 711#undef toupper
 712#undef iscntrl
 713#undef ispunct
 714#undef isxdigit
 715
 716extern const unsigned char sane_ctype[256];
 717#define GIT_SPACE 0x01
 718#define GIT_DIGIT 0x02
 719#define GIT_ALPHA 0x04
 720#define GIT_GLOB_SPECIAL 0x08
 721#define GIT_REGEX_SPECIAL 0x10
 722#define GIT_PATHSPEC_MAGIC 0x20
 723#define GIT_CNTRL 0x40
 724#define GIT_PUNCT 0x80
 725#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 726#define isascii(x) (((x) & ~0x7f) == 0)
 727#define isspace(x) sane_istest(x,GIT_SPACE)
 728#define isdigit(x) sane_istest(x,GIT_DIGIT)
 729#define isalpha(x) sane_istest(x,GIT_ALPHA)
 730#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 731#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 732#define islower(x) sane_iscase(x, 1)
 733#define isupper(x) sane_iscase(x, 0)
 734#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 735#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 736#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 737#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 738                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 739#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 740#define tolower(x) sane_case((unsigned char)(x), 0x20)
 741#define toupper(x) sane_case((unsigned char)(x), 0)
 742#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 743
 744static inline int sane_case(int x, int high)
 745{
 746        if (sane_istest(x, GIT_ALPHA))
 747                x = (x & ~0x20) | high;
 748        return x;
 749}
 750
 751static inline int sane_iscase(int x, int is_lower)
 752{
 753        if (!sane_istest(x, GIT_ALPHA))
 754                return 0;
 755
 756        if (is_lower)
 757                return (x & 0x20) != 0;
 758        else
 759                return (x & 0x20) == 0;
 760}
 761
 762static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 763{
 764        unsigned long ul;
 765        char *p;
 766
 767        errno = 0;
 768        ul = strtoul(s, &p, base);
 769        if (errno || *p || p == s || (unsigned int) ul != ul)
 770                return -1;
 771        *result = ul;
 772        return 0;
 773}
 774
 775static inline int strtol_i(char const *s, int base, int *result)
 776{
 777        long ul;
 778        char *p;
 779
 780        errno = 0;
 781        ul = strtol(s, &p, base);
 782        if (errno || *p || p == s || (int) ul != ul)
 783                return -1;
 784        *result = ul;
 785        return 0;
 786}
 787
 788#ifdef INTERNAL_QSORT
 789void git_qsort(void *base, size_t nmemb, size_t size,
 790               int(*compar)(const void *, const void *));
 791#define qsort git_qsort
 792#endif
 793
 794#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 795# define FORCE_DIR_SET_GID S_ISGID
 796#else
 797# define FORCE_DIR_SET_GID 0
 798#endif
 799
 800#ifdef NO_NSEC
 801#undef USE_NSEC
 802#define ST_CTIME_NSEC(st) 0
 803#define ST_MTIME_NSEC(st) 0
 804#else
 805#ifdef USE_ST_TIMESPEC
 806#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 807#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 808#else
 809#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 810#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 811#endif
 812#endif
 813
 814#ifdef UNRELIABLE_FSTAT
 815#define fstat_is_reliable() 0
 816#else
 817#define fstat_is_reliable() 1
 818#endif
 819
 820#ifndef va_copy
 821/*
 822 * Since an obvious implementation of va_list would be to make it a
 823 * pointer into the stack frame, a simple assignment will work on
 824 * many systems.  But let's try to be more portable.
 825 */
 826#ifdef __va_copy
 827#define va_copy(dst, src) __va_copy(dst, src)
 828#else
 829#define va_copy(dst, src) ((dst) = (src))
 830#endif
 831#endif
 832
 833#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 834#define HAVE_VARIADIC_MACROS 1
 835#endif
 836
 837/*
 838 * Preserves errno, prints a message, but gives no warning for ENOENT.
 839 * Returns 0 on success, which includes trying to unlink an object that does
 840 * not exist.
 841 */
 842int unlink_or_warn(const char *path);
 843 /*
 844  * Tries to unlink file.  Returns 0 if unlink succeeded
 845  * or the file already didn't exist.  Returns -1 and
 846  * appends a message to err suitable for
 847  * 'error("%s", err->buf)' on error.
 848  */
 849int unlink_or_msg(const char *file, struct strbuf *err);
 850/*
 851 * Preserves errno, prints a message, but gives no warning for ENOENT.
 852 * Returns 0 on success, which includes trying to remove a directory that does
 853 * not exist.
 854 */
 855int rmdir_or_warn(const char *path);
 856/*
 857 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 858 * the supplied file mode.
 859 */
 860int remove_or_warn(unsigned int mode, const char *path);
 861
 862/*
 863 * Call access(2), but warn for any error except "missing file"
 864 * (ENOENT or ENOTDIR).
 865 */
 866#define ACCESS_EACCES_OK (1U << 0)
 867int access_or_warn(const char *path, int mode, unsigned flag);
 868int access_or_die(const char *path, int mode, unsigned flag);
 869
 870/* Warn on an inaccessible file that ought to be accessible */
 871void warn_on_inaccessible(const char *path);
 872
 873/* Get the passwd entry for the UID of the current process. */
 874struct passwd *xgetpwuid_self(void);
 875
 876#ifdef GMTIME_UNRELIABLE_ERRORS
 877struct tm *git_gmtime(const time_t *);
 878struct tm *git_gmtime_r(const time_t *, struct tm *);
 879#define gmtime git_gmtime
 880#define gmtime_r git_gmtime_r
 881#endif
 882
 883#endif