Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6
   7/* Derived from Linux "Features Test Macro" header
   8 * Convenience macros to test the versions of gcc (or
   9 * a compatible compiler).
  10 * Use them like this:
  11 *  #if GIT_GNUC_PREREQ (2,8)
  12 *   ... code requiring gcc 2.8 or later ...
  13 *  #endif
  14*/
  15#if defined(__GNUC__) && defined(__GNUC_MINOR__)
  16# define GIT_GNUC_PREREQ(maj, min) \
  17        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  18#else
  19 #define GIT_GNUC_PREREQ(maj, min) 0
  20#endif
  21
  22
  23#ifndef FLEX_ARRAY
  24/*
  25 * See if our compiler is known to support flexible array members.
  26 */
  27#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  28# define FLEX_ARRAY /* empty */
  29#elif defined(__GNUC__)
  30# if (__GNUC__ >= 3)
  31#  define FLEX_ARRAY /* empty */
  32# else
  33#  define FLEX_ARRAY 0 /* older GNU extension */
  34# endif
  35#endif
  36
  37/*
  38 * Otherwise, default to safer but a bit wasteful traditional style
  39 */
  40#ifndef FLEX_ARRAY
  41# define FLEX_ARRAY 1
  42#endif
  43#endif
  44
  45
  46/*
  47 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
  48 * @cond: the compile-time condition which must be true.
  49 *
  50 * Your compile will fail if the condition isn't true, or can't be evaluated
  51 * by the compiler.  This can be used in an expression: its value is "0".
  52 *
  53 * Example:
  54 *      #define foo_to_char(foo)                                        \
  55 *               ((char *)(foo)                                         \
  56 *                + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
  57 */
  58#define BUILD_ASSERT_OR_ZERO(cond) \
  59        (sizeof(char [1 - 2*!(cond)]) - 1)
  60
  61#if 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      !defined(__CYGWIN__)
 132#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 133#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 134#endif
 135#define _ALL_SOURCE 1
 136#define _GNU_SOURCE 1
 137#define _BSD_SOURCE 1
 138#define _DEFAULT_SOURCE 1
 139#define _NETBSD_SOURCE 1
 140#define _SGI_SOURCE 1
 141
 142#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 143# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 144#  define _WIN32_WINNT 0x0502
 145# endif
 146#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 147#include <winsock2.h>
 148#include <windows.h>
 149#define GIT_WINDOWS_NATIVE
 150#endif
 151
 152#include <unistd.h>
 153#include <stdio.h>
 154#include <sys/stat.h>
 155#include <fcntl.h>
 156#include <stddef.h>
 157#include <stdlib.h>
 158#include <stdarg.h>
 159#include <string.h>
 160#ifdef HAVE_STRINGS_H
 161#include <strings.h> /* for strcasecmp() */
 162#endif
 163#include <errno.h>
 164#include <limits.h>
 165#ifdef NEEDS_SYS_PARAM_H
 166#include <sys/param.h>
 167#endif
 168#include <sys/types.h>
 169#include <dirent.h>
 170#include <sys/time.h>
 171#include <time.h>
 172#include <signal.h>
 173#include <assert.h>
 174#include <regex.h>
 175#include <utime.h>
 176#include <syslog.h>
 177#ifndef NO_SYS_POLL_H
 178#include <sys/poll.h>
 179#else
 180#include <poll.h>
 181#endif
 182#ifdef HAVE_BSD_SYSCTL
 183#include <sys/sysctl.h>
 184#endif
 185
 186#if defined(__MINGW32__)
 187/* pull in Windows compatibility stuff */
 188#include "compat/mingw.h"
 189#elif defined(_MSC_VER)
 190#include "compat/msvc.h"
 191#else
 192#include <sys/wait.h>
 193#include <sys/resource.h>
 194#include <sys/socket.h>
 195#include <sys/ioctl.h>
 196#include <termios.h>
 197#ifndef NO_SYS_SELECT_H
 198#include <sys/select.h>
 199#endif
 200#include <netinet/in.h>
 201#include <netinet/tcp.h>
 202#include <arpa/inet.h>
 203#include <netdb.h>
 204#include <pwd.h>
 205#include <sys/un.h>
 206#ifndef NO_INTTYPES_H
 207#include <inttypes.h>
 208#else
 209#include <stdint.h>
 210#endif
 211#ifdef NO_INTPTR_T
 212/*
 213 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 214 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 215 * while on IP16 and IP16L32 it is "int" (resp. "short")
 216 * Size needs to match (or exceed) 'sizeof(void *)'.
 217 * We can't take "long long" here as not everybody has it.
 218 */
 219typedef long intptr_t;
 220typedef unsigned long uintptr_t;
 221#endif
 222#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 223#include <grp.h>
 224#define _ALL_SOURCE 1
 225#endif
 226
 227/* used on Mac OS X */
 228#ifdef PRECOMPOSE_UNICODE
 229#include "compat/precompose_utf8.h"
 230#else
 231#define precompose_str(in,i_nfd2nfc)
 232#define precompose_argv(c,v)
 233#define probe_utf8_pathname_composition(a,b)
 234#endif
 235
 236#ifdef MKDIR_WO_TRAILING_SLASH
 237#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 238extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 239#endif
 240
 241#ifdef NO_STRUCT_ITIMERVAL
 242struct itimerval {
 243        struct timeval it_interval;
 244        struct timeval it_value;
 245};
 246#endif
 247
 248#ifdef NO_SETITIMER
 249#define setitimer(which,value,ovalue)
 250#endif
 251
 252#ifndef NO_LIBGEN_H
 253#include <libgen.h>
 254#else
 255#define basename gitbasename
 256extern char *gitbasename(char *);
 257#endif
 258
 259#ifndef NO_ICONV
 260#include <iconv.h>
 261#endif
 262
 263#ifndef NO_OPENSSL
 264#ifdef __APPLE__
 265#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 266#include <AvailabilityMacros.h>
 267#undef DEPRECATED_ATTRIBUTE
 268#define DEPRECATED_ATTRIBUTE
 269#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 270#endif
 271#include <openssl/ssl.h>
 272#include <openssl/err.h>
 273#ifdef NO_HMAC_CTX_CLEANUP
 274#define HMAC_CTX_cleanup HMAC_cleanup
 275#endif
 276#endif
 277
 278/* On most systems <netdb.h> would have given us this, but
 279 * not on some systems (e.g. z/OS).
 280 */
 281#ifndef NI_MAXHOST
 282#define NI_MAXHOST 1025
 283#endif
 284
 285#ifndef NI_MAXSERV
 286#define NI_MAXSERV 32
 287#endif
 288
 289/* On most systems <limits.h> would have given us this, but
 290 * not on some systems (e.g. GNU/Hurd).
 291 */
 292#ifndef PATH_MAX
 293#define PATH_MAX 4096
 294#endif
 295
 296#ifndef PRIuMAX
 297#define PRIuMAX "llu"
 298#endif
 299
 300#ifndef PRIu32
 301#define PRIu32 "u"
 302#endif
 303
 304#ifndef PRIx32
 305#define PRIx32 "x"
 306#endif
 307
 308#ifndef PRIo32
 309#define PRIo32 "o"
 310#endif
 311
 312#ifndef PATH_SEP
 313#define PATH_SEP ':'
 314#endif
 315
 316#ifdef HAVE_PATHS_H
 317#include <paths.h>
 318#endif
 319#ifndef _PATH_DEFPATH
 320#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 321#endif
 322
 323#ifndef STRIP_EXTENSION
 324#define STRIP_EXTENSION ""
 325#endif
 326
 327#ifndef has_dos_drive_prefix
 328static inline int git_has_dos_drive_prefix(const char *path)
 329{
 330        return 0;
 331}
 332#define has_dos_drive_prefix git_has_dos_drive_prefix
 333#endif
 334
 335#ifndef is_dir_sep
 336static inline int git_is_dir_sep(int c)
 337{
 338        return c == '/';
 339}
 340#define is_dir_sep git_is_dir_sep
 341#endif
 342
 343#ifndef offset_1st_component
 344static inline int git_offset_1st_component(const char *path)
 345{
 346        return is_dir_sep(path[0]);
 347}
 348#define offset_1st_component git_offset_1st_component
 349#endif
 350
 351#ifndef find_last_dir_sep
 352static inline char *git_find_last_dir_sep(const char *path)
 353{
 354        return strrchr(path, '/');
 355}
 356#define find_last_dir_sep git_find_last_dir_sep
 357#endif
 358
 359#if defined(__HP_cc) && (__HP_cc >= 61000)
 360#define NORETURN __attribute__((noreturn))
 361#define NORETURN_PTR
 362#elif defined(__GNUC__) && !defined(NO_NORETURN)
 363#define NORETURN __attribute__((__noreturn__))
 364#define NORETURN_PTR __attribute__((__noreturn__))
 365#elif defined(_MSC_VER)
 366#define NORETURN __declspec(noreturn)
 367#define NORETURN_PTR
 368#else
 369#define NORETURN
 370#define NORETURN_PTR
 371#ifndef __GNUC__
 372#ifndef __attribute__
 373#define __attribute__(x)
 374#endif
 375#endif
 376#endif
 377
 378/* The sentinel attribute is valid from gcc version 4.0 */
 379#if defined(__GNUC__) && (__GNUC__ >= 4)
 380#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 381#else
 382#define LAST_ARG_MUST_BE_NULL
 383#endif
 384
 385#include "compat/bswap.h"
 386
 387#include "wildmatch.h"
 388
 389struct strbuf;
 390
 391/* General helper functions */
 392extern void vreportf(const char *prefix, const char *err, va_list params);
 393extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 394extern NORETURN void usage(const char *err);
 395extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 396extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 397extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 398extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 399extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 400
 401#ifndef NO_OPENSSL
 402#ifdef APPLE_COMMON_CRYPTO
 403#include "compat/apple-common-crypto.h"
 404#else
 405#include <openssl/evp.h>
 406#include <openssl/hmac.h>
 407#endif /* APPLE_COMMON_CRYPTO */
 408#include <openssl/x509v3.h>
 409#endif /* NO_OPENSSL */
 410
 411/*
 412 * Let callers be aware of the constant return value; this can help
 413 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 414 * because some compilers may not support variadic macros. Since we're only
 415 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 416 * using the function as usual.
 417 */
 418#if defined(__GNUC__)
 419static inline int const_error(void)
 420{
 421        return -1;
 422}
 423#define error(...) (error(__VA_ARGS__), const_error())
 424#endif
 425
 426extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 427extern void set_error_routine(void (*routine)(const char *err, va_list params));
 428extern void set_die_is_recursing_routine(int (*routine)(void));
 429
 430extern int starts_with(const char *str, const char *prefix);
 431
 432/*
 433 * If the string "str" begins with the string found in "prefix", return 1.
 434 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 435 * the string right after the prefix).
 436 *
 437 * Otherwise, return 0 and leave "out" untouched.
 438 *
 439 * Examples:
 440 *
 441 *   [extract branch name, fail if not a branch]
 442 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 443 *      return -1;
 444 *
 445 *   [skip prefix if present, otherwise use whole string]
 446 *   skip_prefix(name, "refs/heads/", &name);
 447 */
 448static inline int skip_prefix(const char *str, const char *prefix,
 449                              const char **out)
 450{
 451        do {
 452                if (!*prefix) {
 453                        *out = str;
 454                        return 1;
 455                }
 456        } while (*str++ == *prefix++);
 457        return 0;
 458}
 459
 460/*
 461 * If buf ends with suffix, return 1 and subtract the length of the suffix
 462 * from *len. Otherwise, return 0 and leave *len untouched.
 463 */
 464static inline int strip_suffix_mem(const char *buf, size_t *len,
 465                                   const char *suffix)
 466{
 467        size_t suflen = strlen(suffix);
 468        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 469                return 0;
 470        *len -= suflen;
 471        return 1;
 472}
 473
 474/*
 475 * If str ends with suffix, return 1 and set *len to the size of the string
 476 * without the suffix. Otherwise, return 0 and set *len to the size of the
 477 * string.
 478 *
 479 * Note that we do _not_ NUL-terminate str to the new length.
 480 */
 481static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 482{
 483        *len = strlen(str);
 484        return strip_suffix_mem(str, len, suffix);
 485}
 486
 487static inline int ends_with(const char *str, const char *suffix)
 488{
 489        size_t len;
 490        return strip_suffix(str, suffix, &len);
 491}
 492
 493#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 494
 495#ifndef PROT_READ
 496#define PROT_READ 1
 497#define PROT_WRITE 2
 498#define MAP_PRIVATE 1
 499#endif
 500
 501#define mmap git_mmap
 502#define munmap git_munmap
 503extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 504extern int git_munmap(void *start, size_t length);
 505
 506#else /* NO_MMAP || USE_WIN32_MMAP */
 507
 508#include <sys/mman.h>
 509
 510#endif /* NO_MMAP || USE_WIN32_MMAP */
 511
 512#ifdef NO_MMAP
 513
 514/* This value must be multiple of (pagesize * 2) */
 515#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 516
 517#else /* NO_MMAP */
 518
 519/* This value must be multiple of (pagesize * 2) */
 520#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 521        (sizeof(void*) >= 8 \
 522                ?  1 * 1024 * 1024 * 1024 \
 523                : 32 * 1024 * 1024)
 524
 525#endif /* NO_MMAP */
 526
 527#ifndef MAP_FAILED
 528#define MAP_FAILED ((void *)-1)
 529#endif
 530
 531#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 532#define on_disk_bytes(st) ((st).st_size)
 533#else
 534#define on_disk_bytes(st) ((st).st_blocks * 512)
 535#endif
 536
 537#ifdef NEEDS_MODE_TRANSLATION
 538#undef S_IFMT
 539#undef S_IFREG
 540#undef S_IFDIR
 541#undef S_IFLNK
 542#undef S_IFBLK
 543#undef S_IFCHR
 544#undef S_IFIFO
 545#undef S_IFSOCK
 546#define S_IFMT   0170000
 547#define S_IFREG  0100000
 548#define S_IFDIR  0040000
 549#define S_IFLNK  0120000
 550#define S_IFBLK  0060000
 551#define S_IFCHR  0020000
 552#define S_IFIFO  0010000
 553#define S_IFSOCK 0140000
 554#ifdef stat
 555#undef stat
 556#endif
 557#define stat(path, buf) git_stat(path, buf)
 558extern int git_stat(const char *, struct stat *);
 559#ifdef fstat
 560#undef fstat
 561#endif
 562#define fstat(fd, buf) git_fstat(fd, buf)
 563extern int git_fstat(int, struct stat *);
 564#ifdef lstat
 565#undef lstat
 566#endif
 567#define lstat(path, buf) git_lstat(path, buf)
 568extern int git_lstat(const char *, struct stat *);
 569#endif
 570
 571#define DEFAULT_PACKED_GIT_LIMIT \
 572        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 573
 574#ifdef NO_PREAD
 575#define pread git_pread
 576extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 577#endif
 578/*
 579 * Forward decl that will remind us if its twin in cache.h changes.
 580 * This function is used in compat/pread.c.  But we can't include
 581 * cache.h there.
 582 */
 583extern ssize_t read_in_full(int fd, void *buf, size_t count);
 584
 585#ifdef NO_SETENV
 586#define setenv gitsetenv
 587extern int gitsetenv(const char *, const char *, int);
 588#endif
 589
 590#ifdef NO_MKDTEMP
 591#define mkdtemp gitmkdtemp
 592extern char *gitmkdtemp(char *);
 593#endif
 594
 595#ifdef NO_MKSTEMPS
 596#define mkstemps gitmkstemps
 597extern int gitmkstemps(char *, int);
 598#endif
 599
 600#ifdef NO_UNSETENV
 601#define unsetenv gitunsetenv
 602extern void gitunsetenv(const char *);
 603#endif
 604
 605#ifdef NO_STRCASESTR
 606#define strcasestr gitstrcasestr
 607extern char *gitstrcasestr(const char *haystack, const char *needle);
 608#endif
 609
 610#ifdef NO_STRLCPY
 611#define strlcpy gitstrlcpy
 612extern size_t gitstrlcpy(char *, const char *, size_t);
 613#endif
 614
 615#ifdef NO_STRTOUMAX
 616#define strtoumax gitstrtoumax
 617extern uintmax_t gitstrtoumax(const char *, char **, int);
 618#define strtoimax gitstrtoimax
 619extern intmax_t gitstrtoimax(const char *, char **, int);
 620#endif
 621
 622#ifdef NO_HSTRERROR
 623#define hstrerror githstrerror
 624extern const char *githstrerror(int herror);
 625#endif
 626
 627#ifdef NO_MEMMEM
 628#define memmem gitmemmem
 629void *gitmemmem(const void *haystack, size_t haystacklen,
 630                const void *needle, size_t needlelen);
 631#endif
 632
 633#ifdef NO_GETPAGESIZE
 634#define getpagesize() sysconf(_SC_PAGESIZE)
 635#endif
 636
 637#ifdef FREAD_READS_DIRECTORIES
 638#ifdef fopen
 639#undef fopen
 640#endif
 641#define fopen(a,b) git_fopen(a,b)
 642extern FILE *git_fopen(const char*, const char*);
 643#endif
 644
 645#ifdef SNPRINTF_RETURNS_BOGUS
 646#ifdef snprintf
 647#undef snprintf
 648#endif
 649#define snprintf git_snprintf
 650extern int git_snprintf(char *str, size_t maxsize,
 651                        const char *format, ...);
 652#ifdef vsnprintf
 653#undef vsnprintf
 654#endif
 655#define vsnprintf git_vsnprintf
 656extern int git_vsnprintf(char *str, size_t maxsize,
 657                         const char *format, va_list ap);
 658#endif
 659
 660#ifdef __GLIBC_PREREQ
 661#if __GLIBC_PREREQ(2, 1)
 662#define HAVE_STRCHRNUL
 663#define HAVE_MEMPCPY
 664#endif
 665#endif
 666
 667#ifndef HAVE_STRCHRNUL
 668#define strchrnul gitstrchrnul
 669static inline char *gitstrchrnul(const char *s, int c)
 670{
 671        while (*s && *s != c)
 672                s++;
 673        return (char *)s;
 674}
 675#endif
 676
 677#ifndef HAVE_MEMPCPY
 678#define mempcpy gitmempcpy
 679static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 680{
 681        return (char *)memcpy(dest, src, n) + n;
 682}
 683#endif
 684
 685#ifdef NO_INET_PTON
 686int inet_pton(int af, const char *src, void *dst);
 687#endif
 688
 689#ifdef NO_INET_NTOP
 690const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 691#endif
 692
 693#ifdef NO_PTHREADS
 694#define atexit git_atexit
 695extern int git_atexit(void (*handler)(void));
 696#endif
 697
 698extern void release_pack_memory(size_t);
 699
 700typedef void (*try_to_free_t)(size_t);
 701extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 702
 703#ifdef HAVE_ALLOCA_H
 704# include <alloca.h>
 705# define xalloca(size)      (alloca(size))
 706# define xalloca_free(p)    do {} while (0)
 707#else
 708# define xalloca(size)      (xmalloc(size))
 709# define xalloca_free(p)    (free(p))
 710#endif
 711extern char *xstrdup(const char *str);
 712extern void *xmalloc(size_t size);
 713extern void *xmallocz(size_t size);
 714extern void *xmallocz_gently(size_t size);
 715extern void *xmemdupz(const void *data, size_t len);
 716extern char *xstrndup(const char *str, size_t len);
 717extern void *xrealloc(void *ptr, size_t size);
 718extern void *xcalloc(size_t nmemb, size_t size);
 719extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 720extern ssize_t xread(int fd, void *buf, size_t len);
 721extern ssize_t xwrite(int fd, const void *buf, size_t len);
 722extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 723extern int xdup(int fd);
 724extern FILE *xfdopen(int fd, const char *mode);
 725extern int xmkstemp(char *template);
 726extern int xmkstemp_mode(char *template, int mode);
 727extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 728extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 729extern char *xgetcwd(void);
 730
 731#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 732
 733static inline char *xstrdup_or_null(const char *str)
 734{
 735        return str ? xstrdup(str) : NULL;
 736}
 737
 738static inline size_t xsize_t(off_t len)
 739{
 740        if (len > (size_t) len)
 741                die("Cannot handle files this big");
 742        return (size_t)len;
 743}
 744
 745/* in ctype.c, for kwset users */
 746extern const unsigned char tolower_trans_tbl[256];
 747
 748/* Sane ctype - no locale, and works with signed chars */
 749#undef isascii
 750#undef isspace
 751#undef isdigit
 752#undef isalpha
 753#undef isalnum
 754#undef isprint
 755#undef islower
 756#undef isupper
 757#undef tolower
 758#undef toupper
 759#undef iscntrl
 760#undef ispunct
 761#undef isxdigit
 762
 763extern const unsigned char sane_ctype[256];
 764#define GIT_SPACE 0x01
 765#define GIT_DIGIT 0x02
 766#define GIT_ALPHA 0x04
 767#define GIT_GLOB_SPECIAL 0x08
 768#define GIT_REGEX_SPECIAL 0x10
 769#define GIT_PATHSPEC_MAGIC 0x20
 770#define GIT_CNTRL 0x40
 771#define GIT_PUNCT 0x80
 772#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 773#define isascii(x) (((x) & ~0x7f) == 0)
 774#define isspace(x) sane_istest(x,GIT_SPACE)
 775#define isdigit(x) sane_istest(x,GIT_DIGIT)
 776#define isalpha(x) sane_istest(x,GIT_ALPHA)
 777#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 778#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 779#define islower(x) sane_iscase(x, 1)
 780#define isupper(x) sane_iscase(x, 0)
 781#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 782#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 783#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 784#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 785                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 786#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 787#define tolower(x) sane_case((unsigned char)(x), 0x20)
 788#define toupper(x) sane_case((unsigned char)(x), 0)
 789#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 790
 791static inline int sane_case(int x, int high)
 792{
 793        if (sane_istest(x, GIT_ALPHA))
 794                x = (x & ~0x20) | high;
 795        return x;
 796}
 797
 798static inline int sane_iscase(int x, int is_lower)
 799{
 800        if (!sane_istest(x, GIT_ALPHA))
 801                return 0;
 802
 803        if (is_lower)
 804                return (x & 0x20) != 0;
 805        else
 806                return (x & 0x20) == 0;
 807}
 808
 809static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 810{
 811        unsigned long ul;
 812        char *p;
 813
 814        errno = 0;
 815        ul = strtoul(s, &p, base);
 816        if (errno || *p || p == s || (unsigned int) ul != ul)
 817                return -1;
 818        *result = ul;
 819        return 0;
 820}
 821
 822static inline int strtol_i(char const *s, int base, int *result)
 823{
 824        long ul;
 825        char *p;
 826
 827        errno = 0;
 828        ul = strtol(s, &p, base);
 829        if (errno || *p || p == s || (int) ul != ul)
 830                return -1;
 831        *result = ul;
 832        return 0;
 833}
 834
 835#ifdef INTERNAL_QSORT
 836void git_qsort(void *base, size_t nmemb, size_t size,
 837               int(*compar)(const void *, const void *));
 838#define qsort git_qsort
 839#endif
 840
 841#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 842# define FORCE_DIR_SET_GID S_ISGID
 843#else
 844# define FORCE_DIR_SET_GID 0
 845#endif
 846
 847#ifdef NO_NSEC
 848#undef USE_NSEC
 849#define ST_CTIME_NSEC(st) 0
 850#define ST_MTIME_NSEC(st) 0
 851#else
 852#ifdef USE_ST_TIMESPEC
 853#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 854#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 855#else
 856#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 857#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 858#endif
 859#endif
 860
 861#ifdef UNRELIABLE_FSTAT
 862#define fstat_is_reliable() 0
 863#else
 864#define fstat_is_reliable() 1
 865#endif
 866
 867#ifndef va_copy
 868/*
 869 * Since an obvious implementation of va_list would be to make it a
 870 * pointer into the stack frame, a simple assignment will work on
 871 * many systems.  But let's try to be more portable.
 872 */
 873#ifdef __va_copy
 874#define va_copy(dst, src) __va_copy(dst, src)
 875#else
 876#define va_copy(dst, src) ((dst) = (src))
 877#endif
 878#endif
 879
 880#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 881#define HAVE_VARIADIC_MACROS 1
 882#endif
 883
 884/*
 885 * Preserves errno, prints a message, but gives no warning for ENOENT.
 886 * Returns 0 on success, which includes trying to unlink an object that does
 887 * not exist.
 888 */
 889int unlink_or_warn(const char *path);
 890 /*
 891  * Tries to unlink file.  Returns 0 if unlink succeeded
 892  * or the file already didn't exist.  Returns -1 and
 893  * appends a message to err suitable for
 894  * 'error("%s", err->buf)' on error.
 895  */
 896int unlink_or_msg(const char *file, struct strbuf *err);
 897/*
 898 * Preserves errno, prints a message, but gives no warning for ENOENT.
 899 * Returns 0 on success, which includes trying to remove a directory that does
 900 * not exist.
 901 */
 902int rmdir_or_warn(const char *path);
 903/*
 904 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 905 * the supplied file mode.
 906 */
 907int remove_or_warn(unsigned int mode, const char *path);
 908
 909/*
 910 * Call access(2), but warn for any error except "missing file"
 911 * (ENOENT or ENOTDIR).
 912 */
 913#define ACCESS_EACCES_OK (1U << 0)
 914int access_or_warn(const char *path, int mode, unsigned flag);
 915int access_or_die(const char *path, int mode, unsigned flag);
 916
 917/* Warn on an inaccessible file that ought to be accessible */
 918void warn_on_inaccessible(const char *path);
 919
 920/* Get the passwd entry for the UID of the current process. */
 921struct passwd *xgetpwuid_self(void);
 922
 923#ifdef GMTIME_UNRELIABLE_ERRORS
 924struct tm *git_gmtime(const time_t *);
 925struct tm *git_gmtime_r(const time_t *, struct tm *);
 926#define gmtime git_gmtime
 927#define gmtime_r git_gmtime_r
 928#endif
 929
 930#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 931#define USE_PARENS_AROUND_GETTEXT_N 1
 932#endif
 933
 934#ifndef SHELL_PATH
 935# define SHELL_PATH "/bin/sh"
 936#endif
 937
 938#endif