Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6
   7/* Derived from Linux "Features Test Macro" header
   8 * Convenience macros to test the versions of gcc (or
   9 * a compatible compiler).
  10 * Use them like this:
  11 *  #if GIT_GNUC_PREREQ (2,8)
  12 *   ... code requiring gcc 2.8 or later ...
  13 *  #endif
  14*/
  15#if defined(__GNUC__) && defined(__GNUC_MINOR__)
  16# define GIT_GNUC_PREREQ(maj, min) \
  17        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
  18#else
  19 #define GIT_GNUC_PREREQ(maj, min) 0
  20#endif
  21
  22
  23#ifndef FLEX_ARRAY
  24/*
  25 * See if our compiler is known to support flexible array members.
  26 */
  27#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  28# define FLEX_ARRAY /* empty */
  29#elif defined(__GNUC__)
  30# if (__GNUC__ >= 3)
  31#  define FLEX_ARRAY /* empty */
  32# else
  33#  define FLEX_ARRAY 0 /* older GNU extension */
  34# endif
  35#endif
  36
  37/*
  38 * Otherwise, default to safer but a bit wasteful traditional style
  39 */
  40#ifndef FLEX_ARRAY
  41# define FLEX_ARRAY 1
  42#endif
  43#endif
  44
  45
  46/*
  47 * BUILD_ASSERT_OR_ZERO - assert a build-time dependency, as an expression.
  48 * @cond: the compile-time condition which must be true.
  49 *
  50 * Your compile will fail if the condition isn't true, or can't be evaluated
  51 * by the compiler.  This can be used in an expression: its value is "0".
  52 *
  53 * Example:
  54 *      #define foo_to_char(foo)                                        \
  55 *               ((char *)(foo)                                         \
  56 *                + BUILD_ASSERT_OR_ZERO(offsetof(struct foo, string) == 0))
  57 */
  58#define BUILD_ASSERT_OR_ZERO(cond) \
  59        (sizeof(char [1 - 2*!(cond)]) - 1)
  60
  61#if GIT_GNUC_PREREQ(3, 1)
  62 /* &arr[0] degrades to a pointer: a different type from an array */
  63# define BARF_UNLESS_AN_ARRAY(arr)                                              \
  64        BUILD_ASSERT_OR_ZERO(!__builtin_types_compatible_p(__typeof__(arr), \
  65                                                           __typeof__(&(arr)[0])))
  66#else
  67# define BARF_UNLESS_AN_ARRAY(arr) 0
  68#endif
  69/*
  70 * ARRAY_SIZE - get the number of elements in a visible array
  71 *  <at> x: the array whose size you want.
  72 *
  73 * This does not work on pointers, or arrays declared as [], or
  74 * function parameters.  With correct compiler support, such usage
  75 * will cause a build error (see the build_assert_or_zero macro).
  76 */
  77#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]) + BARF_UNLESS_AN_ARRAY(x))
  78
  79#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  80
  81#define maximum_signed_value_of_type(a) \
  82    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  83
  84#define maximum_unsigned_value_of_type(a) \
  85    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  86
  87/*
  88 * Signed integer overflow is undefined in C, so here's a helper macro
  89 * to detect if the sum of two integers will overflow.
  90 *
  91 * Requires: a >= 0, typeof(a) equals typeof(b)
  92 */
  93#define signed_add_overflows(a, b) \
  94    ((b) > maximum_signed_value_of_type(a) - (a))
  95
  96#define unsigned_add_overflows(a, b) \
  97    ((b) > maximum_unsigned_value_of_type(a) - (a))
  98
  99#ifdef __GNUC__
 100#define TYPEOF(x) (__typeof__(x))
 101#else
 102#define TYPEOF(x)
 103#endif
 104
 105#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 106#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 107
 108#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 109
 110/* Approximation of the length of the decimal representation of this type. */
 111#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 112
 113#if defined(__sun__)
 114 /*
 115  * On Solaris, when _XOPEN_EXTENDED is set, its header file
 116  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 117  * setting to say we are XPG5 or XPG6.  Also on Solaris,
 118  * XPG6 programs must be compiled with a c99 compiler, while
 119  * non XPG6 programs must be compiled with a pre-c99 compiler.
 120  */
 121# if __STDC_VERSION__ - 0 >= 199901L
 122# define _XOPEN_SOURCE 600
 123# else
 124# define _XOPEN_SOURCE 500
 125# endif
 126#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 127      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 128      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 129      !defined(__CYGWIN__)
 130#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 131#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 132#endif
 133#define _ALL_SOURCE 1
 134#define _GNU_SOURCE 1
 135#define _BSD_SOURCE 1
 136#define _DEFAULT_SOURCE 1
 137#define _NETBSD_SOURCE 1
 138#define _SGI_SOURCE 1
 139
 140#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 141# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 142#  define _WIN32_WINNT 0x0502
 143# endif
 144#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 145#include <winsock2.h>
 146#include <windows.h>
 147#define GIT_WINDOWS_NATIVE
 148#endif
 149
 150#include <unistd.h>
 151#include <stdio.h>
 152#include <sys/stat.h>
 153#include <fcntl.h>
 154#include <stddef.h>
 155#include <stdlib.h>
 156#include <stdarg.h>
 157#include <string.h>
 158#ifdef HAVE_STRINGS_H
 159#include <strings.h> /* for strcasecmp() */
 160#endif
 161#include <errno.h>
 162#include <limits.h>
 163#ifdef NEEDS_SYS_PARAM_H
 164#include <sys/param.h>
 165#endif
 166#include <sys/types.h>
 167#include <dirent.h>
 168#include <sys/time.h>
 169#include <time.h>
 170#include <signal.h>
 171#include <assert.h>
 172#include <regex.h>
 173#include <utime.h>
 174#include <syslog.h>
 175#ifndef NO_SYS_POLL_H
 176#include <sys/poll.h>
 177#else
 178#include <poll.h>
 179#endif
 180#ifdef HAVE_BSD_SYSCTL
 181#include <sys/sysctl.h>
 182#endif
 183
 184#if defined(__MINGW32__)
 185/* pull in Windows compatibility stuff */
 186#include "compat/mingw.h"
 187#elif defined(_MSC_VER)
 188#include "compat/msvc.h"
 189#else
 190#include <sys/utsname.h>
 191#include <sys/wait.h>
 192#include <sys/resource.h>
 193#include <sys/socket.h>
 194#include <sys/ioctl.h>
 195#include <termios.h>
 196#ifndef NO_SYS_SELECT_H
 197#include <sys/select.h>
 198#endif
 199#include <netinet/in.h>
 200#include <netinet/tcp.h>
 201#include <arpa/inet.h>
 202#include <netdb.h>
 203#include <pwd.h>
 204#include <sys/un.h>
 205#ifndef NO_INTTYPES_H
 206#include <inttypes.h>
 207#else
 208#include <stdint.h>
 209#endif
 210#ifdef NO_INTPTR_T
 211/*
 212 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 213 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 214 * while on IP16 and IP16L32 it is "int" (resp. "short")
 215 * Size needs to match (or exceed) 'sizeof(void *)'.
 216 * We can't take "long long" here as not everybody has it.
 217 */
 218typedef long intptr_t;
 219typedef unsigned long uintptr_t;
 220#endif
 221#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 222#include <grp.h>
 223#define _ALL_SOURCE 1
 224#endif
 225
 226/* used on Mac OS X */
 227#ifdef PRECOMPOSE_UNICODE
 228#include "compat/precompose_utf8.h"
 229#else
 230#define precompose_str(in,i_nfd2nfc)
 231#define precompose_argv(c,v)
 232#define probe_utf8_pathname_composition()
 233#endif
 234
 235#ifdef MKDIR_WO_TRAILING_SLASH
 236#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 237extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 238#endif
 239
 240#ifdef NO_STRUCT_ITIMERVAL
 241struct itimerval {
 242        struct timeval it_interval;
 243        struct timeval it_value;
 244};
 245#endif
 246
 247#ifdef NO_SETITIMER
 248#define setitimer(which,value,ovalue)
 249#endif
 250
 251#ifndef NO_LIBGEN_H
 252#include <libgen.h>
 253#else
 254#define basename gitbasename
 255extern char *gitbasename(char *);
 256#define dirname gitdirname
 257extern char *gitdirname(char *);
 258#endif
 259
 260#ifndef NO_ICONV
 261#include <iconv.h>
 262#endif
 263
 264#ifndef NO_OPENSSL
 265#ifdef __APPLE__
 266#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 267#include <AvailabilityMacros.h>
 268#undef DEPRECATED_ATTRIBUTE
 269#define DEPRECATED_ATTRIBUTE
 270#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 271#endif
 272#include <openssl/ssl.h>
 273#include <openssl/err.h>
 274#ifdef NO_HMAC_CTX_CLEANUP
 275#define HMAC_CTX_cleanup HMAC_cleanup
 276#endif
 277#endif
 278
 279/* On most systems <netdb.h> would have given us this, but
 280 * not on some systems (e.g. z/OS).
 281 */
 282#ifndef NI_MAXHOST
 283#define NI_MAXHOST 1025
 284#endif
 285
 286#ifndef NI_MAXSERV
 287#define NI_MAXSERV 32
 288#endif
 289
 290/* On most systems <limits.h> would have given us this, but
 291 * not on some systems (e.g. GNU/Hurd).
 292 */
 293#ifndef PATH_MAX
 294#define PATH_MAX 4096
 295#endif
 296
 297#ifndef PRIuMAX
 298#define PRIuMAX "llu"
 299#endif
 300
 301#ifndef SCNuMAX
 302#define SCNuMAX PRIuMAX
 303#endif
 304
 305#ifndef PRIu32
 306#define PRIu32 "u"
 307#endif
 308
 309#ifndef PRIx32
 310#define PRIx32 "x"
 311#endif
 312
 313#ifndef PRIo32
 314#define PRIo32 "o"
 315#endif
 316
 317#ifndef PATH_SEP
 318#define PATH_SEP ':'
 319#endif
 320
 321#ifdef HAVE_PATHS_H
 322#include <paths.h>
 323#endif
 324#ifndef _PATH_DEFPATH
 325#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 326#endif
 327
 328#ifndef STRIP_EXTENSION
 329#define STRIP_EXTENSION ""
 330#endif
 331
 332#ifndef has_dos_drive_prefix
 333static inline int git_has_dos_drive_prefix(const char *path)
 334{
 335        return 0;
 336}
 337#define has_dos_drive_prefix git_has_dos_drive_prefix
 338#endif
 339
 340#ifndef skip_dos_drive_prefix
 341static inline int git_skip_dos_drive_prefix(char **path)
 342{
 343        return 0;
 344}
 345#define skip_dos_drive_prefix git_skip_dos_drive_prefix
 346#endif
 347
 348#ifndef is_dir_sep
 349static inline int git_is_dir_sep(int c)
 350{
 351        return c == '/';
 352}
 353#define is_dir_sep git_is_dir_sep
 354#endif
 355
 356#ifndef offset_1st_component
 357static inline int git_offset_1st_component(const char *path)
 358{
 359        return is_dir_sep(path[0]);
 360}
 361#define offset_1st_component git_offset_1st_component
 362#endif
 363
 364#ifndef find_last_dir_sep
 365static inline char *git_find_last_dir_sep(const char *path)
 366{
 367        return strrchr(path, '/');
 368}
 369#define find_last_dir_sep git_find_last_dir_sep
 370#endif
 371
 372#if defined(__HP_cc) && (__HP_cc >= 61000)
 373#define NORETURN __attribute__((noreturn))
 374#define NORETURN_PTR
 375#elif defined(__GNUC__) && !defined(NO_NORETURN)
 376#define NORETURN __attribute__((__noreturn__))
 377#define NORETURN_PTR __attribute__((__noreturn__))
 378#elif defined(_MSC_VER)
 379#define NORETURN __declspec(noreturn)
 380#define NORETURN_PTR
 381#else
 382#define NORETURN
 383#define NORETURN_PTR
 384#ifndef __GNUC__
 385#ifndef __attribute__
 386#define __attribute__(x)
 387#endif
 388#endif
 389#endif
 390
 391/* The sentinel attribute is valid from gcc version 4.0 */
 392#if defined(__GNUC__) && (__GNUC__ >= 4)
 393#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 394#else
 395#define LAST_ARG_MUST_BE_NULL
 396#endif
 397
 398#include "compat/bswap.h"
 399
 400#include "wildmatch.h"
 401
 402struct strbuf;
 403
 404/* General helper functions */
 405extern void vreportf(const char *prefix, const char *err, va_list params);
 406extern NORETURN void usage(const char *err);
 407extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 408extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 409extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 410extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 411extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 412
 413#ifndef NO_OPENSSL
 414#ifdef APPLE_COMMON_CRYPTO
 415#include "compat/apple-common-crypto.h"
 416#else
 417#include <openssl/evp.h>
 418#include <openssl/hmac.h>
 419#endif /* APPLE_COMMON_CRYPTO */
 420#include <openssl/x509v3.h>
 421#endif /* NO_OPENSSL */
 422
 423/*
 424 * Let callers be aware of the constant return value; this can help
 425 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 426 * because some compilers may not support variadic macros. Since we're only
 427 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 428 * using the function as usual.
 429 */
 430#if defined(__GNUC__)
 431static inline int const_error(void)
 432{
 433        return -1;
 434}
 435#define error(...) (error(__VA_ARGS__), const_error())
 436#endif
 437
 438extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 439extern void set_error_routine(void (*routine)(const char *err, va_list params));
 440extern void set_die_is_recursing_routine(int (*routine)(void));
 441extern void set_error_handle(FILE *);
 442
 443extern int starts_with(const char *str, const char *prefix);
 444
 445/*
 446 * If the string "str" begins with the string found in "prefix", return 1.
 447 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 448 * the string right after the prefix).
 449 *
 450 * Otherwise, return 0 and leave "out" untouched.
 451 *
 452 * Examples:
 453 *
 454 *   [extract branch name, fail if not a branch]
 455 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 456 *      return -1;
 457 *
 458 *   [skip prefix if present, otherwise use whole string]
 459 *   skip_prefix(name, "refs/heads/", &name);
 460 */
 461static inline int skip_prefix(const char *str, const char *prefix,
 462                              const char **out)
 463{
 464        do {
 465                if (!*prefix) {
 466                        *out = str;
 467                        return 1;
 468                }
 469        } while (*str++ == *prefix++);
 470        return 0;
 471}
 472
 473/*
 474 * If buf ends with suffix, return 1 and subtract the length of the suffix
 475 * from *len. Otherwise, return 0 and leave *len untouched.
 476 */
 477static inline int strip_suffix_mem(const char *buf, size_t *len,
 478                                   const char *suffix)
 479{
 480        size_t suflen = strlen(suffix);
 481        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 482                return 0;
 483        *len -= suflen;
 484        return 1;
 485}
 486
 487/*
 488 * If str ends with suffix, return 1 and set *len to the size of the string
 489 * without the suffix. Otherwise, return 0 and set *len to the size of the
 490 * string.
 491 *
 492 * Note that we do _not_ NUL-terminate str to the new length.
 493 */
 494static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 495{
 496        *len = strlen(str);
 497        return strip_suffix_mem(str, len, suffix);
 498}
 499
 500static inline int ends_with(const char *str, const char *suffix)
 501{
 502        size_t len;
 503        return strip_suffix(str, suffix, &len);
 504}
 505
 506#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 507
 508#ifndef PROT_READ
 509#define PROT_READ 1
 510#define PROT_WRITE 2
 511#define MAP_PRIVATE 1
 512#endif
 513
 514#define mmap git_mmap
 515#define munmap git_munmap
 516extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 517extern int git_munmap(void *start, size_t length);
 518
 519#else /* NO_MMAP || USE_WIN32_MMAP */
 520
 521#include <sys/mman.h>
 522
 523#endif /* NO_MMAP || USE_WIN32_MMAP */
 524
 525#ifdef NO_MMAP
 526
 527/* This value must be multiple of (pagesize * 2) */
 528#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 529
 530#else /* NO_MMAP */
 531
 532/* This value must be multiple of (pagesize * 2) */
 533#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 534        (sizeof(void*) >= 8 \
 535                ?  1 * 1024 * 1024 * 1024 \
 536                : 32 * 1024 * 1024)
 537
 538#endif /* NO_MMAP */
 539
 540#ifndef MAP_FAILED
 541#define MAP_FAILED ((void *)-1)
 542#endif
 543
 544#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 545#define on_disk_bytes(st) ((st).st_size)
 546#else
 547#define on_disk_bytes(st) ((st).st_blocks * 512)
 548#endif
 549
 550#ifdef NEEDS_MODE_TRANSLATION
 551#undef S_IFMT
 552#undef S_IFREG
 553#undef S_IFDIR
 554#undef S_IFLNK
 555#undef S_IFBLK
 556#undef S_IFCHR
 557#undef S_IFIFO
 558#undef S_IFSOCK
 559#define S_IFMT   0170000
 560#define S_IFREG  0100000
 561#define S_IFDIR  0040000
 562#define S_IFLNK  0120000
 563#define S_IFBLK  0060000
 564#define S_IFCHR  0020000
 565#define S_IFIFO  0010000
 566#define S_IFSOCK 0140000
 567#ifdef stat
 568#undef stat
 569#endif
 570#define stat(path, buf) git_stat(path, buf)
 571extern int git_stat(const char *, struct stat *);
 572#ifdef fstat
 573#undef fstat
 574#endif
 575#define fstat(fd, buf) git_fstat(fd, buf)
 576extern int git_fstat(int, struct stat *);
 577#ifdef lstat
 578#undef lstat
 579#endif
 580#define lstat(path, buf) git_lstat(path, buf)
 581extern int git_lstat(const char *, struct stat *);
 582#endif
 583
 584#define DEFAULT_PACKED_GIT_LIMIT \
 585        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 586
 587#ifdef NO_PREAD
 588#define pread git_pread
 589extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 590#endif
 591/*
 592 * Forward decl that will remind us if its twin in cache.h changes.
 593 * This function is used in compat/pread.c.  But we can't include
 594 * cache.h there.
 595 */
 596extern ssize_t read_in_full(int fd, void *buf, size_t count);
 597
 598#ifdef NO_SETENV
 599#define setenv gitsetenv
 600extern int gitsetenv(const char *, const char *, int);
 601#endif
 602
 603#ifdef NO_MKDTEMP
 604#define mkdtemp gitmkdtemp
 605extern char *gitmkdtemp(char *);
 606#endif
 607
 608#ifdef NO_MKSTEMPS
 609#define mkstemps gitmkstemps
 610extern int gitmkstemps(char *, int);
 611#endif
 612
 613#ifdef NO_UNSETENV
 614#define unsetenv gitunsetenv
 615extern void gitunsetenv(const char *);
 616#endif
 617
 618#ifdef NO_STRCASESTR
 619#define strcasestr gitstrcasestr
 620extern char *gitstrcasestr(const char *haystack, const char *needle);
 621#endif
 622
 623#ifdef NO_STRLCPY
 624#define strlcpy gitstrlcpy
 625extern size_t gitstrlcpy(char *, const char *, size_t);
 626#endif
 627
 628#ifdef NO_STRTOUMAX
 629#define strtoumax gitstrtoumax
 630extern uintmax_t gitstrtoumax(const char *, char **, int);
 631#define strtoimax gitstrtoimax
 632extern intmax_t gitstrtoimax(const char *, char **, int);
 633#endif
 634
 635#ifdef NO_HSTRERROR
 636#define hstrerror githstrerror
 637extern const char *githstrerror(int herror);
 638#endif
 639
 640#ifdef NO_MEMMEM
 641#define memmem gitmemmem
 642void *gitmemmem(const void *haystack, size_t haystacklen,
 643                const void *needle, size_t needlelen);
 644#endif
 645
 646#ifdef NO_GETPAGESIZE
 647#define getpagesize() sysconf(_SC_PAGESIZE)
 648#endif
 649
 650#ifdef FREAD_READS_DIRECTORIES
 651#ifdef fopen
 652#undef fopen
 653#endif
 654#define fopen(a,b) git_fopen(a,b)
 655extern FILE *git_fopen(const char*, const char*);
 656#endif
 657
 658#ifdef SNPRINTF_RETURNS_BOGUS
 659#ifdef snprintf
 660#undef snprintf
 661#endif
 662#define snprintf git_snprintf
 663extern int git_snprintf(char *str, size_t maxsize,
 664                        const char *format, ...);
 665#ifdef vsnprintf
 666#undef vsnprintf
 667#endif
 668#define vsnprintf git_vsnprintf
 669extern int git_vsnprintf(char *str, size_t maxsize,
 670                         const char *format, va_list ap);
 671#endif
 672
 673#ifdef __GLIBC_PREREQ
 674#if __GLIBC_PREREQ(2, 1)
 675#define HAVE_STRCHRNUL
 676#define HAVE_MEMPCPY
 677#endif
 678#endif
 679
 680#ifndef HAVE_STRCHRNUL
 681#define strchrnul gitstrchrnul
 682static inline char *gitstrchrnul(const char *s, int c)
 683{
 684        while (*s && *s != c)
 685                s++;
 686        return (char *)s;
 687}
 688#endif
 689
 690#ifndef HAVE_MEMPCPY
 691#define mempcpy gitmempcpy
 692static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 693{
 694        return (char *)memcpy(dest, src, n) + n;
 695}
 696#endif
 697
 698#ifdef NO_INET_PTON
 699int inet_pton(int af, const char *src, void *dst);
 700#endif
 701
 702#ifdef NO_INET_NTOP
 703const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 704#endif
 705
 706#ifdef NO_PTHREADS
 707#define atexit git_atexit
 708extern int git_atexit(void (*handler)(void));
 709#endif
 710
 711extern void release_pack_memory(size_t);
 712
 713typedef void (*try_to_free_t)(size_t);
 714extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 715
 716#ifdef HAVE_ALLOCA_H
 717# include <alloca.h>
 718# define xalloca(size)      (alloca(size))
 719# define xalloca_free(p)    do {} while (0)
 720#else
 721# define xalloca(size)      (xmalloc(size))
 722# define xalloca_free(p)    (free(p))
 723#endif
 724extern char *xstrdup(const char *str);
 725extern void *xmalloc(size_t size);
 726extern void *xmallocz(size_t size);
 727extern void *xmallocz_gently(size_t size);
 728extern void *xmemdupz(const void *data, size_t len);
 729extern char *xstrndup(const char *str, size_t len);
 730extern void *xrealloc(void *ptr, size_t size);
 731extern void *xcalloc(size_t nmemb, size_t size);
 732extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 733extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 734extern int xopen(const char *path, int flags, ...);
 735extern ssize_t xread(int fd, void *buf, size_t len);
 736extern ssize_t xwrite(int fd, const void *buf, size_t len);
 737extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 738extern int xdup(int fd);
 739extern FILE *xfopen(const char *path, const char *mode);
 740extern FILE *xfdopen(int fd, const char *mode);
 741extern int xmkstemp(char *template);
 742extern int xmkstemp_mode(char *template, int mode);
 743extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 744extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 745extern char *xgetcwd(void);
 746extern FILE *fopen_for_writing(const char *path);
 747
 748#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 749
 750static inline char *xstrdup_or_null(const char *str)
 751{
 752        return str ? xstrdup(str) : NULL;
 753}
 754
 755static inline size_t xsize_t(off_t len)
 756{
 757        if (len > (size_t) len)
 758                die("Cannot handle files this big");
 759        return (size_t)len;
 760}
 761
 762__attribute__((format (printf, 3, 4)))
 763extern int xsnprintf(char *dst, size_t max, const char *fmt, ...);
 764
 765/* in ctype.c, for kwset users */
 766extern const unsigned char tolower_trans_tbl[256];
 767
 768/* Sane ctype - no locale, and works with signed chars */
 769#undef isascii
 770#undef isspace
 771#undef isdigit
 772#undef isalpha
 773#undef isalnum
 774#undef isprint
 775#undef islower
 776#undef isupper
 777#undef tolower
 778#undef toupper
 779#undef iscntrl
 780#undef ispunct
 781#undef isxdigit
 782
 783extern const unsigned char sane_ctype[256];
 784#define GIT_SPACE 0x01
 785#define GIT_DIGIT 0x02
 786#define GIT_ALPHA 0x04
 787#define GIT_GLOB_SPECIAL 0x08
 788#define GIT_REGEX_SPECIAL 0x10
 789#define GIT_PATHSPEC_MAGIC 0x20
 790#define GIT_CNTRL 0x40
 791#define GIT_PUNCT 0x80
 792#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 793#define isascii(x) (((x) & ~0x7f) == 0)
 794#define isspace(x) sane_istest(x,GIT_SPACE)
 795#define isdigit(x) sane_istest(x,GIT_DIGIT)
 796#define isalpha(x) sane_istest(x,GIT_ALPHA)
 797#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 798#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 799#define islower(x) sane_iscase(x, 1)
 800#define isupper(x) sane_iscase(x, 0)
 801#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 802#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 803#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 804#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 805                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 806#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 807#define tolower(x) sane_case((unsigned char)(x), 0x20)
 808#define toupper(x) sane_case((unsigned char)(x), 0)
 809#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 810
 811static inline int sane_case(int x, int high)
 812{
 813        if (sane_istest(x, GIT_ALPHA))
 814                x = (x & ~0x20) | high;
 815        return x;
 816}
 817
 818static inline int sane_iscase(int x, int is_lower)
 819{
 820        if (!sane_istest(x, GIT_ALPHA))
 821                return 0;
 822
 823        if (is_lower)
 824                return (x & 0x20) != 0;
 825        else
 826                return (x & 0x20) == 0;
 827}
 828
 829static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 830{
 831        unsigned long ul;
 832        char *p;
 833
 834        errno = 0;
 835        /* negative values would be accepted by strtoul */
 836        if (strchr(s, '-'))
 837                return -1;
 838        ul = strtoul(s, &p, base);
 839        if (errno || *p || p == s || (unsigned int) ul != ul)
 840                return -1;
 841        *result = ul;
 842        return 0;
 843}
 844
 845static inline int strtol_i(char const *s, int base, int *result)
 846{
 847        long ul;
 848        char *p;
 849
 850        errno = 0;
 851        ul = strtol(s, &p, base);
 852        if (errno || *p || p == s || (int) ul != ul)
 853                return -1;
 854        *result = ul;
 855        return 0;
 856}
 857
 858#ifdef INTERNAL_QSORT
 859void git_qsort(void *base, size_t nmemb, size_t size,
 860               int(*compar)(const void *, const void *));
 861#define qsort git_qsort
 862#endif
 863
 864#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 865# define FORCE_DIR_SET_GID S_ISGID
 866#else
 867# define FORCE_DIR_SET_GID 0
 868#endif
 869
 870#ifdef NO_NSEC
 871#undef USE_NSEC
 872#define ST_CTIME_NSEC(st) 0
 873#define ST_MTIME_NSEC(st) 0
 874#else
 875#ifdef USE_ST_TIMESPEC
 876#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 877#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 878#else
 879#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 880#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 881#endif
 882#endif
 883
 884#ifdef UNRELIABLE_FSTAT
 885#define fstat_is_reliable() 0
 886#else
 887#define fstat_is_reliable() 1
 888#endif
 889
 890#ifndef va_copy
 891/*
 892 * Since an obvious implementation of va_list would be to make it a
 893 * pointer into the stack frame, a simple assignment will work on
 894 * many systems.  But let's try to be more portable.
 895 */
 896#ifdef __va_copy
 897#define va_copy(dst, src) __va_copy(dst, src)
 898#else
 899#define va_copy(dst, src) ((dst) = (src))
 900#endif
 901#endif
 902
 903#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 904#define HAVE_VARIADIC_MACROS 1
 905#endif
 906
 907/*
 908 * Preserves errno, prints a message, but gives no warning for ENOENT.
 909 * Returns 0 on success, which includes trying to unlink an object that does
 910 * not exist.
 911 */
 912int unlink_or_warn(const char *path);
 913 /*
 914  * Tries to unlink file.  Returns 0 if unlink succeeded
 915  * or the file already didn't exist.  Returns -1 and
 916  * appends a message to err suitable for
 917  * 'error("%s", err->buf)' on error.
 918  */
 919int unlink_or_msg(const char *file, struct strbuf *err);
 920/*
 921 * Preserves errno, prints a message, but gives no warning for ENOENT.
 922 * Returns 0 on success, which includes trying to remove a directory that does
 923 * not exist.
 924 */
 925int rmdir_or_warn(const char *path);
 926/*
 927 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 928 * the supplied file mode.
 929 */
 930int remove_or_warn(unsigned int mode, const char *path);
 931
 932/*
 933 * Call access(2), but warn for any error except "missing file"
 934 * (ENOENT or ENOTDIR).
 935 */
 936#define ACCESS_EACCES_OK (1U << 0)
 937int access_or_warn(const char *path, int mode, unsigned flag);
 938int access_or_die(const char *path, int mode, unsigned flag);
 939
 940/* Warn on an inaccessible file that ought to be accessible */
 941void warn_on_inaccessible(const char *path);
 942
 943#ifdef GMTIME_UNRELIABLE_ERRORS
 944struct tm *git_gmtime(const time_t *);
 945struct tm *git_gmtime_r(const time_t *, struct tm *);
 946#define gmtime git_gmtime
 947#define gmtime_r git_gmtime_r
 948#endif
 949
 950#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 951#define USE_PARENS_AROUND_GETTEXT_N 1
 952#endif
 953
 954#ifndef SHELL_PATH
 955# define SHELL_PATH "/bin/sh"
 956#endif
 957
 958#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 959#define flockfile(fh)
 960#define funlockfile(fh)
 961#define getc_unlocked(fh) getc(fh)
 962#endif
 963
 964#endif