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/utsname.h>
 193#include <sys/wait.h>
 194#include <sys/resource.h>
 195#include <sys/socket.h>
 196#include <sys/ioctl.h>
 197#include <termios.h>
 198#ifndef NO_SYS_SELECT_H
 199#include <sys/select.h>
 200#endif
 201#include <netinet/in.h>
 202#include <netinet/tcp.h>
 203#include <arpa/inet.h>
 204#include <netdb.h>
 205#include <pwd.h>
 206#include <sys/un.h>
 207#ifndef NO_INTTYPES_H
 208#include <inttypes.h>
 209#else
 210#include <stdint.h>
 211#endif
 212#ifdef NO_INTPTR_T
 213/*
 214 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 215 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 216 * while on IP16 and IP16L32 it is "int" (resp. "short")
 217 * Size needs to match (or exceed) 'sizeof(void *)'.
 218 * We can't take "long long" here as not everybody has it.
 219 */
 220typedef long intptr_t;
 221typedef unsigned long uintptr_t;
 222#endif
 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
 228/* used on Mac OS X */
 229#ifdef PRECOMPOSE_UNICODE
 230#include "compat/precompose_utf8.h"
 231#else
 232#define precompose_str(in,i_nfd2nfc)
 233#define precompose_argv(c,v)
 234#define probe_utf8_pathname_composition(a,b)
 235#endif
 236
 237#ifdef MKDIR_WO_TRAILING_SLASH
 238#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 239extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 240#endif
 241
 242#ifdef NO_STRUCT_ITIMERVAL
 243struct itimerval {
 244        struct timeval it_interval;
 245        struct timeval it_value;
 246};
 247#endif
 248
 249#ifdef NO_SETITIMER
 250#define setitimer(which,value,ovalue)
 251#endif
 252
 253#ifndef NO_LIBGEN_H
 254#include <libgen.h>
 255#else
 256#define basename gitbasename
 257extern char *gitbasename(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 PRIu32
 302#define PRIu32 "u"
 303#endif
 304
 305#ifndef PRIx32
 306#define PRIx32 "x"
 307#endif
 308
 309#ifndef PRIo32
 310#define PRIo32 "o"
 311#endif
 312
 313#ifndef PATH_SEP
 314#define PATH_SEP ':'
 315#endif
 316
 317#ifdef HAVE_PATHS_H
 318#include <paths.h>
 319#endif
 320#ifndef _PATH_DEFPATH
 321#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 322#endif
 323
 324#ifndef STRIP_EXTENSION
 325#define STRIP_EXTENSION ""
 326#endif
 327
 328#ifndef has_dos_drive_prefix
 329static inline int git_has_dos_drive_prefix(const char *path)
 330{
 331        return 0;
 332}
 333#define has_dos_drive_prefix git_has_dos_drive_prefix
 334#endif
 335
 336#ifndef is_dir_sep
 337static inline int git_is_dir_sep(int c)
 338{
 339        return c == '/';
 340}
 341#define is_dir_sep git_is_dir_sep
 342#endif
 343
 344#ifndef offset_1st_component
 345static inline int git_offset_1st_component(const char *path)
 346{
 347        return is_dir_sep(path[0]);
 348}
 349#define offset_1st_component git_offset_1st_component
 350#endif
 351
 352#ifndef find_last_dir_sep
 353static inline char *git_find_last_dir_sep(const char *path)
 354{
 355        return strrchr(path, '/');
 356}
 357#define find_last_dir_sep git_find_last_dir_sep
 358#endif
 359
 360#if defined(__HP_cc) && (__HP_cc >= 61000)
 361#define NORETURN __attribute__((noreturn))
 362#define NORETURN_PTR
 363#elif defined(__GNUC__) && !defined(NO_NORETURN)
 364#define NORETURN __attribute__((__noreturn__))
 365#define NORETURN_PTR __attribute__((__noreturn__))
 366#elif defined(_MSC_VER)
 367#define NORETURN __declspec(noreturn)
 368#define NORETURN_PTR
 369#else
 370#define NORETURN
 371#define NORETURN_PTR
 372#ifndef __GNUC__
 373#ifndef __attribute__
 374#define __attribute__(x)
 375#endif
 376#endif
 377#endif
 378
 379/* The sentinel attribute is valid from gcc version 4.0 */
 380#if defined(__GNUC__) && (__GNUC__ >= 4)
 381#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 382#else
 383#define LAST_ARG_MUST_BE_NULL
 384#endif
 385
 386#include "compat/bswap.h"
 387
 388#include "wildmatch.h"
 389
 390struct strbuf;
 391
 392/* General helper functions */
 393extern void vreportf(const char *prefix, const char *err, va_list params);
 394extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 395extern NORETURN void usage(const char *err);
 396extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 397extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 398extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 399extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 400extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 401
 402#ifndef NO_OPENSSL
 403#ifdef APPLE_COMMON_CRYPTO
 404#include "compat/apple-common-crypto.h"
 405#else
 406#include <openssl/evp.h>
 407#include <openssl/hmac.h>
 408#endif /* APPLE_COMMON_CRYPTO */
 409#include <openssl/x509v3.h>
 410#endif /* NO_OPENSSL */
 411
 412/*
 413 * Let callers be aware of the constant return value; this can help
 414 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 415 * because some compilers may not support variadic macros. Since we're only
 416 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 417 * using the function as usual.
 418 */
 419#if defined(__GNUC__)
 420static inline int const_error(void)
 421{
 422        return -1;
 423}
 424#define error(...) (error(__VA_ARGS__), const_error())
 425#endif
 426
 427extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 428extern void set_error_routine(void (*routine)(const char *err, va_list params));
 429extern void set_die_is_recursing_routine(int (*routine)(void));
 430
 431extern int starts_with(const char *str, const char *prefix);
 432
 433/*
 434 * If the string "str" begins with the string found in "prefix", return 1.
 435 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 436 * the string right after the prefix).
 437 *
 438 * Otherwise, return 0 and leave "out" untouched.
 439 *
 440 * Examples:
 441 *
 442 *   [extract branch name, fail if not a branch]
 443 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 444 *      return -1;
 445 *
 446 *   [skip prefix if present, otherwise use whole string]
 447 *   skip_prefix(name, "refs/heads/", &name);
 448 */
 449static inline int skip_prefix(const char *str, const char *prefix,
 450                              const char **out)
 451{
 452        do {
 453                if (!*prefix) {
 454                        *out = str;
 455                        return 1;
 456                }
 457        } while (*str++ == *prefix++);
 458        return 0;
 459}
 460
 461/*
 462 * If buf ends with suffix, return 1 and subtract the length of the suffix
 463 * from *len. Otherwise, return 0 and leave *len untouched.
 464 */
 465static inline int strip_suffix_mem(const char *buf, size_t *len,
 466                                   const char *suffix)
 467{
 468        size_t suflen = strlen(suffix);
 469        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 470                return 0;
 471        *len -= suflen;
 472        return 1;
 473}
 474
 475/*
 476 * If str ends with suffix, return 1 and set *len to the size of the string
 477 * without the suffix. Otherwise, return 0 and set *len to the size of the
 478 * string.
 479 *
 480 * Note that we do _not_ NUL-terminate str to the new length.
 481 */
 482static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 483{
 484        *len = strlen(str);
 485        return strip_suffix_mem(str, len, suffix);
 486}
 487
 488static inline int ends_with(const char *str, const char *suffix)
 489{
 490        size_t len;
 491        return strip_suffix(str, suffix, &len);
 492}
 493
 494#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 495
 496#ifndef PROT_READ
 497#define PROT_READ 1
 498#define PROT_WRITE 2
 499#define MAP_PRIVATE 1
 500#endif
 501
 502#define mmap git_mmap
 503#define munmap git_munmap
 504extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 505extern int git_munmap(void *start, size_t length);
 506
 507#else /* NO_MMAP || USE_WIN32_MMAP */
 508
 509#include <sys/mman.h>
 510
 511#endif /* NO_MMAP || USE_WIN32_MMAP */
 512
 513#ifdef NO_MMAP
 514
 515/* This value must be multiple of (pagesize * 2) */
 516#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 517
 518#else /* NO_MMAP */
 519
 520/* This value must be multiple of (pagesize * 2) */
 521#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 522        (sizeof(void*) >= 8 \
 523                ?  1 * 1024 * 1024 * 1024 \
 524                : 32 * 1024 * 1024)
 525
 526#endif /* NO_MMAP */
 527
 528#ifndef MAP_FAILED
 529#define MAP_FAILED ((void *)-1)
 530#endif
 531
 532#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 533#define on_disk_bytes(st) ((st).st_size)
 534#else
 535#define on_disk_bytes(st) ((st).st_blocks * 512)
 536#endif
 537
 538#ifdef NEEDS_MODE_TRANSLATION
 539#undef S_IFMT
 540#undef S_IFREG
 541#undef S_IFDIR
 542#undef S_IFLNK
 543#undef S_IFBLK
 544#undef S_IFCHR
 545#undef S_IFIFO
 546#undef S_IFSOCK
 547#define S_IFMT   0170000
 548#define S_IFREG  0100000
 549#define S_IFDIR  0040000
 550#define S_IFLNK  0120000
 551#define S_IFBLK  0060000
 552#define S_IFCHR  0020000
 553#define S_IFIFO  0010000
 554#define S_IFSOCK 0140000
 555#ifdef stat
 556#undef stat
 557#endif
 558#define stat(path, buf) git_stat(path, buf)
 559extern int git_stat(const char *, struct stat *);
 560#ifdef fstat
 561#undef fstat
 562#endif
 563#define fstat(fd, buf) git_fstat(fd, buf)
 564extern int git_fstat(int, struct stat *);
 565#ifdef lstat
 566#undef lstat
 567#endif
 568#define lstat(path, buf) git_lstat(path, buf)
 569extern int git_lstat(const char *, struct stat *);
 570#endif
 571
 572#define DEFAULT_PACKED_GIT_LIMIT \
 573        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 574
 575#ifdef NO_PREAD
 576#define pread git_pread
 577extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 578#endif
 579/*
 580 * Forward decl that will remind us if its twin in cache.h changes.
 581 * This function is used in compat/pread.c.  But we can't include
 582 * cache.h there.
 583 */
 584extern ssize_t read_in_full(int fd, void *buf, size_t count);
 585
 586#ifdef NO_SETENV
 587#define setenv gitsetenv
 588extern int gitsetenv(const char *, const char *, int);
 589#endif
 590
 591#ifdef NO_MKDTEMP
 592#define mkdtemp gitmkdtemp
 593extern char *gitmkdtemp(char *);
 594#endif
 595
 596#ifdef NO_MKSTEMPS
 597#define mkstemps gitmkstemps
 598extern int gitmkstemps(char *, int);
 599#endif
 600
 601#ifdef NO_UNSETENV
 602#define unsetenv gitunsetenv
 603extern void gitunsetenv(const char *);
 604#endif
 605
 606#ifdef NO_STRCASESTR
 607#define strcasestr gitstrcasestr
 608extern char *gitstrcasestr(const char *haystack, const char *needle);
 609#endif
 610
 611#ifdef NO_STRLCPY
 612#define strlcpy gitstrlcpy
 613extern size_t gitstrlcpy(char *, const char *, size_t);
 614#endif
 615
 616#ifdef NO_STRTOUMAX
 617#define strtoumax gitstrtoumax
 618extern uintmax_t gitstrtoumax(const char *, char **, int);
 619#define strtoimax gitstrtoimax
 620extern intmax_t gitstrtoimax(const char *, char **, int);
 621#endif
 622
 623#ifdef NO_HSTRERROR
 624#define hstrerror githstrerror
 625extern const char *githstrerror(int herror);
 626#endif
 627
 628#ifdef NO_MEMMEM
 629#define memmem gitmemmem
 630void *gitmemmem(const void *haystack, size_t haystacklen,
 631                const void *needle, size_t needlelen);
 632#endif
 633
 634#ifdef NO_GETPAGESIZE
 635#define getpagesize() sysconf(_SC_PAGESIZE)
 636#endif
 637
 638#ifdef FREAD_READS_DIRECTORIES
 639#ifdef fopen
 640#undef fopen
 641#endif
 642#define fopen(a,b) git_fopen(a,b)
 643extern FILE *git_fopen(const char*, const char*);
 644#endif
 645
 646#ifdef SNPRINTF_RETURNS_BOGUS
 647#ifdef snprintf
 648#undef snprintf
 649#endif
 650#define snprintf git_snprintf
 651extern int git_snprintf(char *str, size_t maxsize,
 652                        const char *format, ...);
 653#ifdef vsnprintf
 654#undef vsnprintf
 655#endif
 656#define vsnprintf git_vsnprintf
 657extern int git_vsnprintf(char *str, size_t maxsize,
 658                         const char *format, va_list ap);
 659#endif
 660
 661#ifdef __GLIBC_PREREQ
 662#if __GLIBC_PREREQ(2, 1)
 663#define HAVE_STRCHRNUL
 664#define HAVE_MEMPCPY
 665#endif
 666#endif
 667
 668#ifndef HAVE_STRCHRNUL
 669#define strchrnul gitstrchrnul
 670static inline char *gitstrchrnul(const char *s, int c)
 671{
 672        while (*s && *s != c)
 673                s++;
 674        return (char *)s;
 675}
 676#endif
 677
 678#ifndef HAVE_MEMPCPY
 679#define mempcpy gitmempcpy
 680static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 681{
 682        return (char *)memcpy(dest, src, n) + n;
 683}
 684#endif
 685
 686#ifdef NO_INET_PTON
 687int inet_pton(int af, const char *src, void *dst);
 688#endif
 689
 690#ifdef NO_INET_NTOP
 691const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 692#endif
 693
 694#ifdef NO_PTHREADS
 695#define atexit git_atexit
 696extern int git_atexit(void (*handler)(void));
 697#endif
 698
 699extern void release_pack_memory(size_t);
 700
 701typedef void (*try_to_free_t)(size_t);
 702extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 703
 704#ifdef HAVE_ALLOCA_H
 705# include <alloca.h>
 706# define xalloca(size)      (alloca(size))
 707# define xalloca_free(p)    do {} while (0)
 708#else
 709# define xalloca(size)      (xmalloc(size))
 710# define xalloca_free(p)    (free(p))
 711#endif
 712extern char *xstrdup(const char *str);
 713extern void *xmalloc(size_t size);
 714extern void *xmallocz(size_t size);
 715extern void *xmallocz_gently(size_t size);
 716extern void *xmemdupz(const void *data, size_t len);
 717extern char *xstrndup(const char *str, size_t len);
 718extern void *xrealloc(void *ptr, size_t size);
 719extern void *xcalloc(size_t nmemb, size_t size);
 720extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 721extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 722extern ssize_t xread(int fd, void *buf, size_t len);
 723extern ssize_t xwrite(int fd, const void *buf, size_t len);
 724extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 725extern int xdup(int fd);
 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