Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Merge branch 'xf/user-manual-ff' into maint (684fea3)
   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(a,b)
 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#endif
 257
 258#ifndef NO_ICONV
 259#include <iconv.h>
 260#endif
 261
 262#ifndef NO_OPENSSL
 263#ifdef __APPLE__
 264#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 265#include <AvailabilityMacros.h>
 266#undef DEPRECATED_ATTRIBUTE
 267#define DEPRECATED_ATTRIBUTE
 268#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 269#endif
 270#include <openssl/ssl.h>
 271#include <openssl/err.h>
 272#ifdef NO_HMAC_CTX_CLEANUP
 273#define HMAC_CTX_cleanup HMAC_cleanup
 274#endif
 275#endif
 276
 277/* On most systems <netdb.h> would have given us this, but
 278 * not on some systems (e.g. z/OS).
 279 */
 280#ifndef NI_MAXHOST
 281#define NI_MAXHOST 1025
 282#endif
 283
 284#ifndef NI_MAXSERV
 285#define NI_MAXSERV 32
 286#endif
 287
 288/* On most systems <limits.h> would have given us this, but
 289 * not on some systems (e.g. GNU/Hurd).
 290 */
 291#ifndef PATH_MAX
 292#define PATH_MAX 4096
 293#endif
 294
 295#ifndef PRIuMAX
 296#define PRIuMAX "llu"
 297#endif
 298
 299#ifndef PRIu32
 300#define PRIu32 "u"
 301#endif
 302
 303#ifndef PRIx32
 304#define PRIx32 "x"
 305#endif
 306
 307#ifndef PRIo32
 308#define PRIo32 "o"
 309#endif
 310
 311#ifndef PATH_SEP
 312#define PATH_SEP ':'
 313#endif
 314
 315#ifdef HAVE_PATHS_H
 316#include <paths.h>
 317#endif
 318#ifndef _PATH_DEFPATH
 319#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 320#endif
 321
 322#ifndef STRIP_EXTENSION
 323#define STRIP_EXTENSION ""
 324#endif
 325
 326#ifndef has_dos_drive_prefix
 327static inline int git_has_dos_drive_prefix(const char *path)
 328{
 329        return 0;
 330}
 331#define has_dos_drive_prefix git_has_dos_drive_prefix
 332#endif
 333
 334#ifndef is_dir_sep
 335static inline int git_is_dir_sep(int c)
 336{
 337        return c == '/';
 338}
 339#define is_dir_sep git_is_dir_sep
 340#endif
 341
 342#ifndef offset_1st_component
 343static inline int git_offset_1st_component(const char *path)
 344{
 345        return is_dir_sep(path[0]);
 346}
 347#define offset_1st_component git_offset_1st_component
 348#endif
 349
 350#ifndef find_last_dir_sep
 351static inline char *git_find_last_dir_sep(const char *path)
 352{
 353        return strrchr(path, '/');
 354}
 355#define find_last_dir_sep git_find_last_dir_sep
 356#endif
 357
 358#if defined(__HP_cc) && (__HP_cc >= 61000)
 359#define NORETURN __attribute__((noreturn))
 360#define NORETURN_PTR
 361#elif defined(__GNUC__) && !defined(NO_NORETURN)
 362#define NORETURN __attribute__((__noreturn__))
 363#define NORETURN_PTR __attribute__((__noreturn__))
 364#elif defined(_MSC_VER)
 365#define NORETURN __declspec(noreturn)
 366#define NORETURN_PTR
 367#else
 368#define NORETURN
 369#define NORETURN_PTR
 370#ifndef __GNUC__
 371#ifndef __attribute__
 372#define __attribute__(x)
 373#endif
 374#endif
 375#endif
 376
 377/* The sentinel attribute is valid from gcc version 4.0 */
 378#if defined(__GNUC__) && (__GNUC__ >= 4)
 379#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 380#else
 381#define LAST_ARG_MUST_BE_NULL
 382#endif
 383
 384#include "compat/bswap.h"
 385
 386#include "wildmatch.h"
 387
 388struct strbuf;
 389
 390/* General helper functions */
 391extern void vreportf(const char *prefix, const char *err, va_list params);
 392extern NORETURN void usage(const char *err);
 393extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 394extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 395extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 396extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 397extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 398
 399#ifndef NO_OPENSSL
 400#ifdef APPLE_COMMON_CRYPTO
 401#include "compat/apple-common-crypto.h"
 402#else
 403#include <openssl/evp.h>
 404#include <openssl/hmac.h>
 405#endif /* APPLE_COMMON_CRYPTO */
 406#include <openssl/x509v3.h>
 407#endif /* NO_OPENSSL */
 408
 409/*
 410 * Let callers be aware of the constant return value; this can help
 411 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 412 * because some compilers may not support variadic macros. Since we're only
 413 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 414 * using the function as usual.
 415 */
 416#if defined(__GNUC__)
 417static inline int const_error(void)
 418{
 419        return -1;
 420}
 421#define error(...) (error(__VA_ARGS__), const_error())
 422#endif
 423
 424extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 425extern void set_error_routine(void (*routine)(const char *err, va_list params));
 426extern void set_die_is_recursing_routine(int (*routine)(void));
 427extern void set_error_handle(FILE *);
 428
 429extern int starts_with(const char *str, const char *prefix);
 430
 431/*
 432 * If the string "str" begins with the string found in "prefix", return 1.
 433 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 434 * the string right after the prefix).
 435 *
 436 * Otherwise, return 0 and leave "out" untouched.
 437 *
 438 * Examples:
 439 *
 440 *   [extract branch name, fail if not a branch]
 441 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 442 *      return -1;
 443 *
 444 *   [skip prefix if present, otherwise use whole string]
 445 *   skip_prefix(name, "refs/heads/", &name);
 446 */
 447static inline int skip_prefix(const char *str, const char *prefix,
 448                              const char **out)
 449{
 450        do {
 451                if (!*prefix) {
 452                        *out = str;
 453                        return 1;
 454                }
 455        } while (*str++ == *prefix++);
 456        return 0;
 457}
 458
 459/*
 460 * If buf ends with suffix, return 1 and subtract the length of the suffix
 461 * from *len. Otherwise, return 0 and leave *len untouched.
 462 */
 463static inline int strip_suffix_mem(const char *buf, size_t *len,
 464                                   const char *suffix)
 465{
 466        size_t suflen = strlen(suffix);
 467        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 468                return 0;
 469        *len -= suflen;
 470        return 1;
 471}
 472
 473/*
 474 * If str ends with suffix, return 1 and set *len to the size of the string
 475 * without the suffix. Otherwise, return 0 and set *len to the size of the
 476 * string.
 477 *
 478 * Note that we do _not_ NUL-terminate str to the new length.
 479 */
 480static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 481{
 482        *len = strlen(str);
 483        return strip_suffix_mem(str, len, suffix);
 484}
 485
 486static inline int ends_with(const char *str, const char *suffix)
 487{
 488        size_t len;
 489        return strip_suffix(str, suffix, &len);
 490}
 491
 492#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 493
 494#ifndef PROT_READ
 495#define PROT_READ 1
 496#define PROT_WRITE 2
 497#define MAP_PRIVATE 1
 498#endif
 499
 500#define mmap git_mmap
 501#define munmap git_munmap
 502extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 503extern int git_munmap(void *start, size_t length);
 504
 505#else /* NO_MMAP || USE_WIN32_MMAP */
 506
 507#include <sys/mman.h>
 508
 509#endif /* NO_MMAP || USE_WIN32_MMAP */
 510
 511#ifdef NO_MMAP
 512
 513/* This value must be multiple of (pagesize * 2) */
 514#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 515
 516#else /* NO_MMAP */
 517
 518/* This value must be multiple of (pagesize * 2) */
 519#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 520        (sizeof(void*) >= 8 \
 521                ?  1 * 1024 * 1024 * 1024 \
 522                : 32 * 1024 * 1024)
 523
 524#endif /* NO_MMAP */
 525
 526#ifndef MAP_FAILED
 527#define MAP_FAILED ((void *)-1)
 528#endif
 529
 530#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 531#define on_disk_bytes(st) ((st).st_size)
 532#else
 533#define on_disk_bytes(st) ((st).st_blocks * 512)
 534#endif
 535
 536#ifdef NEEDS_MODE_TRANSLATION
 537#undef S_IFMT
 538#undef S_IFREG
 539#undef S_IFDIR
 540#undef S_IFLNK
 541#undef S_IFBLK
 542#undef S_IFCHR
 543#undef S_IFIFO
 544#undef S_IFSOCK
 545#define S_IFMT   0170000
 546#define S_IFREG  0100000
 547#define S_IFDIR  0040000
 548#define S_IFLNK  0120000
 549#define S_IFBLK  0060000
 550#define S_IFCHR  0020000
 551#define S_IFIFO  0010000
 552#define S_IFSOCK 0140000
 553#ifdef stat
 554#undef stat
 555#endif
 556#define stat(path, buf) git_stat(path, buf)
 557extern int git_stat(const char *, struct stat *);
 558#ifdef fstat
 559#undef fstat
 560#endif
 561#define fstat(fd, buf) git_fstat(fd, buf)
 562extern int git_fstat(int, struct stat *);
 563#ifdef lstat
 564#undef lstat
 565#endif
 566#define lstat(path, buf) git_lstat(path, buf)
 567extern int git_lstat(const char *, struct stat *);
 568#endif
 569
 570#define DEFAULT_PACKED_GIT_LIMIT \
 571        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 572
 573#ifdef NO_PREAD
 574#define pread git_pread
 575extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 576#endif
 577/*
 578 * Forward decl that will remind us if its twin in cache.h changes.
 579 * This function is used in compat/pread.c.  But we can't include
 580 * cache.h there.
 581 */
 582extern ssize_t read_in_full(int fd, void *buf, size_t count);
 583
 584#ifdef NO_SETENV
 585#define setenv gitsetenv
 586extern int gitsetenv(const char *, const char *, int);
 587#endif
 588
 589#ifdef NO_MKDTEMP
 590#define mkdtemp gitmkdtemp
 591extern char *gitmkdtemp(char *);
 592#endif
 593
 594#ifdef NO_MKSTEMPS
 595#define mkstemps gitmkstemps
 596extern int gitmkstemps(char *, int);
 597#endif
 598
 599#ifdef NO_UNSETENV
 600#define unsetenv gitunsetenv
 601extern void gitunsetenv(const char *);
 602#endif
 603
 604#ifdef NO_STRCASESTR
 605#define strcasestr gitstrcasestr
 606extern char *gitstrcasestr(const char *haystack, const char *needle);
 607#endif
 608
 609#ifdef NO_STRLCPY
 610#define strlcpy gitstrlcpy
 611extern size_t gitstrlcpy(char *, const char *, size_t);
 612#endif
 613
 614#ifdef NO_STRTOUMAX
 615#define strtoumax gitstrtoumax
 616extern uintmax_t gitstrtoumax(const char *, char **, int);
 617#define strtoimax gitstrtoimax
 618extern intmax_t gitstrtoimax(const char *, char **, int);
 619#endif
 620
 621#ifdef NO_HSTRERROR
 622#define hstrerror githstrerror
 623extern const char *githstrerror(int herror);
 624#endif
 625
 626#ifdef NO_MEMMEM
 627#define memmem gitmemmem
 628void *gitmemmem(const void *haystack, size_t haystacklen,
 629                const void *needle, size_t needlelen);
 630#endif
 631
 632#ifdef NO_GETPAGESIZE
 633#define getpagesize() sysconf(_SC_PAGESIZE)
 634#endif
 635
 636#ifdef FREAD_READS_DIRECTORIES
 637#ifdef fopen
 638#undef fopen
 639#endif
 640#define fopen(a,b) git_fopen(a,b)
 641extern FILE *git_fopen(const char*, const char*);
 642#endif
 643
 644#ifdef SNPRINTF_RETURNS_BOGUS
 645#ifdef snprintf
 646#undef snprintf
 647#endif
 648#define snprintf git_snprintf
 649extern int git_snprintf(char *str, size_t maxsize,
 650                        const char *format, ...);
 651#ifdef vsnprintf
 652#undef vsnprintf
 653#endif
 654#define vsnprintf git_vsnprintf
 655extern int git_vsnprintf(char *str, size_t maxsize,
 656                         const char *format, va_list ap);
 657#endif
 658
 659#ifdef __GLIBC_PREREQ
 660#if __GLIBC_PREREQ(2, 1)
 661#define HAVE_STRCHRNUL
 662#define HAVE_MEMPCPY
 663#endif
 664#endif
 665
 666#ifndef HAVE_STRCHRNUL
 667#define strchrnul gitstrchrnul
 668static inline char *gitstrchrnul(const char *s, int c)
 669{
 670        while (*s && *s != c)
 671                s++;
 672        return (char *)s;
 673}
 674#endif
 675
 676#ifndef HAVE_MEMPCPY
 677#define mempcpy gitmempcpy
 678static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 679{
 680        return (char *)memcpy(dest, src, n) + n;
 681}
 682#endif
 683
 684#ifdef NO_INET_PTON
 685int inet_pton(int af, const char *src, void *dst);
 686#endif
 687
 688#ifdef NO_INET_NTOP
 689const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 690#endif
 691
 692#ifdef NO_PTHREADS
 693#define atexit git_atexit
 694extern int git_atexit(void (*handler)(void));
 695#endif
 696
 697extern void release_pack_memory(size_t);
 698
 699typedef void (*try_to_free_t)(size_t);
 700extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 701
 702#ifdef HAVE_ALLOCA_H
 703# include <alloca.h>
 704# define xalloca(size)      (alloca(size))
 705# define xalloca_free(p)    do {} while (0)
 706#else
 707# define xalloca(size)      (xmalloc(size))
 708# define xalloca_free(p)    (free(p))
 709#endif
 710extern char *xstrdup(const char *str);
 711extern void *xmalloc(size_t size);
 712extern void *xmallocz(size_t size);
 713extern void *xmallocz_gently(size_t size);
 714extern void *xmemdupz(const void *data, size_t len);
 715extern char *xstrndup(const char *str, size_t len);
 716extern void *xrealloc(void *ptr, size_t size);
 717extern void *xcalloc(size_t nmemb, size_t size);
 718extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 719extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 720extern int xopen(const char *path, int flags, ...);
 721extern ssize_t xread(int fd, void *buf, size_t len);
 722extern ssize_t xwrite(int fd, const void *buf, size_t len);
 723extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 724extern int xdup(int fd);
 725extern FILE *xfopen(const char *path, const char *mode);
 726extern FILE *xfdopen(int fd, const char *mode);
 727extern int xmkstemp(char *template);
 728extern int xmkstemp_mode(char *template, int mode);
 729extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 730extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 731extern char *xgetcwd(void);
 732
 733#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 734
 735static inline char *xstrdup_or_null(const char *str)
 736{
 737        return str ? xstrdup(str) : NULL;
 738}
 739
 740static inline size_t xsize_t(off_t len)
 741{
 742        if (len > (size_t) len)
 743                die("Cannot handle files this big");
 744        return (size_t)len;
 745}
 746
 747/* in ctype.c, for kwset users */
 748extern const unsigned char tolower_trans_tbl[256];
 749
 750/* Sane ctype - no locale, and works with signed chars */
 751#undef isascii
 752#undef isspace
 753#undef isdigit
 754#undef isalpha
 755#undef isalnum
 756#undef isprint
 757#undef islower
 758#undef isupper
 759#undef tolower
 760#undef toupper
 761#undef iscntrl
 762#undef ispunct
 763#undef isxdigit
 764
 765extern const unsigned char sane_ctype[256];
 766#define GIT_SPACE 0x01
 767#define GIT_DIGIT 0x02
 768#define GIT_ALPHA 0x04
 769#define GIT_GLOB_SPECIAL 0x08
 770#define GIT_REGEX_SPECIAL 0x10
 771#define GIT_PATHSPEC_MAGIC 0x20
 772#define GIT_CNTRL 0x40
 773#define GIT_PUNCT 0x80
 774#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 775#define isascii(x) (((x) & ~0x7f) == 0)
 776#define isspace(x) sane_istest(x,GIT_SPACE)
 777#define isdigit(x) sane_istest(x,GIT_DIGIT)
 778#define isalpha(x) sane_istest(x,GIT_ALPHA)
 779#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 780#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 781#define islower(x) sane_iscase(x, 1)
 782#define isupper(x) sane_iscase(x, 0)
 783#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 784#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 785#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 786#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 787                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 788#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 789#define tolower(x) sane_case((unsigned char)(x), 0x20)
 790#define toupper(x) sane_case((unsigned char)(x), 0)
 791#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 792
 793static inline int sane_case(int x, int high)
 794{
 795        if (sane_istest(x, GIT_ALPHA))
 796                x = (x & ~0x20) | high;
 797        return x;
 798}
 799
 800static inline int sane_iscase(int x, int is_lower)
 801{
 802        if (!sane_istest(x, GIT_ALPHA))
 803                return 0;
 804
 805        if (is_lower)
 806                return (x & 0x20) != 0;
 807        else
 808                return (x & 0x20) == 0;
 809}
 810
 811static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 812{
 813        unsigned long ul;
 814        char *p;
 815
 816        errno = 0;
 817        ul = strtoul(s, &p, base);
 818        if (errno || *p || p == s || (unsigned int) ul != ul)
 819                return -1;
 820        *result = ul;
 821        return 0;
 822}
 823
 824static inline int strtol_i(char const *s, int base, int *result)
 825{
 826        long ul;
 827        char *p;
 828
 829        errno = 0;
 830        ul = strtol(s, &p, base);
 831        if (errno || *p || p == s || (int) ul != ul)
 832                return -1;
 833        *result = ul;
 834        return 0;
 835}
 836
 837#ifdef INTERNAL_QSORT
 838void git_qsort(void *base, size_t nmemb, size_t size,
 839               int(*compar)(const void *, const void *));
 840#define qsort git_qsort
 841#endif
 842
 843#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 844# define FORCE_DIR_SET_GID S_ISGID
 845#else
 846# define FORCE_DIR_SET_GID 0
 847#endif
 848
 849#ifdef NO_NSEC
 850#undef USE_NSEC
 851#define ST_CTIME_NSEC(st) 0
 852#define ST_MTIME_NSEC(st) 0
 853#else
 854#ifdef USE_ST_TIMESPEC
 855#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 856#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 857#else
 858#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 859#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 860#endif
 861#endif
 862
 863#ifdef UNRELIABLE_FSTAT
 864#define fstat_is_reliable() 0
 865#else
 866#define fstat_is_reliable() 1
 867#endif
 868
 869#ifndef va_copy
 870/*
 871 * Since an obvious implementation of va_list would be to make it a
 872 * pointer into the stack frame, a simple assignment will work on
 873 * many systems.  But let's try to be more portable.
 874 */
 875#ifdef __va_copy
 876#define va_copy(dst, src) __va_copy(dst, src)
 877#else
 878#define va_copy(dst, src) ((dst) = (src))
 879#endif
 880#endif
 881
 882#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 883#define HAVE_VARIADIC_MACROS 1
 884#endif
 885
 886/*
 887 * Preserves errno, prints a message, but gives no warning for ENOENT.
 888 * Returns 0 on success, which includes trying to unlink an object that does
 889 * not exist.
 890 */
 891int unlink_or_warn(const char *path);
 892 /*
 893  * Tries to unlink file.  Returns 0 if unlink succeeded
 894  * or the file already didn't exist.  Returns -1 and
 895  * appends a message to err suitable for
 896  * 'error("%s", err->buf)' on error.
 897  */
 898int unlink_or_msg(const char *file, struct strbuf *err);
 899/*
 900 * Preserves errno, prints a message, but gives no warning for ENOENT.
 901 * Returns 0 on success, which includes trying to remove a directory that does
 902 * not exist.
 903 */
 904int rmdir_or_warn(const char *path);
 905/*
 906 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 907 * the supplied file mode.
 908 */
 909int remove_or_warn(unsigned int mode, const char *path);
 910
 911/*
 912 * Call access(2), but warn for any error except "missing file"
 913 * (ENOENT or ENOTDIR).
 914 */
 915#define ACCESS_EACCES_OK (1U << 0)
 916int access_or_warn(const char *path, int mode, unsigned flag);
 917int access_or_die(const char *path, int mode, unsigned flag);
 918
 919/* Warn on an inaccessible file that ought to be accessible */
 920void warn_on_inaccessible(const char *path);
 921
 922/* Get the passwd entry for the UID of the current process. */
 923struct passwd *xgetpwuid_self(void);
 924
 925#ifdef GMTIME_UNRELIABLE_ERRORS
 926struct tm *git_gmtime(const time_t *);
 927struct tm *git_gmtime_r(const time_t *, struct tm *);
 928#define gmtime git_gmtime
 929#define gmtime_r git_gmtime_r
 930#endif
 931
 932#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 933#define USE_PARENS_AROUND_GETTEXT_N 1
 934#endif
 935
 936#ifndef SHELL_PATH
 937# define SHELL_PATH "/bin/sh"
 938#endif
 939
 940#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 941#define flockfile(fh)
 942#define funlockfile(fh)
 943#define getc_unlocked(fh) getc(fh)
 944#endif
 945
 946#endif