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/*
 100 * Returns true if the multiplication of "a" and "b" will
 101 * overflow. The types of "a" and "b" must match and must be unsigned.
 102 * Note that this macro evaluates "a" twice!
 103 */
 104#define unsigned_mult_overflows(a, b) \
 105    ((a) && (b) > maximum_unsigned_value_of_type(a) / (a))
 106
 107#ifdef __GNUC__
 108#define TYPEOF(x) (__typeof__(x))
 109#else
 110#define TYPEOF(x)
 111#endif
 112
 113#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
 114#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
 115
 116#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 117
 118/* Approximation of the length of the decimal representation of this type. */
 119#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
 120
 121#if defined(__sun__)
 122 /*
 123  * On Solaris, when _XOPEN_EXTENDED is set, its header file
 124  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
 125  * setting to say we are XPG5 or XPG6.  Also on Solaris,
 126  * XPG6 programs must be compiled with a c99 compiler, while
 127  * non XPG6 programs must be compiled with a pre-c99 compiler.
 128  */
 129# if __STDC_VERSION__ - 0 >= 199901L
 130# define _XOPEN_SOURCE 600
 131# else
 132# define _XOPEN_SOURCE 500
 133# endif
 134#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
 135      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
 136      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
 137      !defined(__CYGWIN__)
 138#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
 139#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
 140#endif
 141#define _ALL_SOURCE 1
 142#define _GNU_SOURCE 1
 143#define _BSD_SOURCE 1
 144#define _DEFAULT_SOURCE 1
 145#define _NETBSD_SOURCE 1
 146#define _SGI_SOURCE 1
 147
 148#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
 149# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
 150#  define _WIN32_WINNT 0x0502
 151# endif
 152#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
 153#include <winsock2.h>
 154#include <windows.h>
 155#define GIT_WINDOWS_NATIVE
 156#endif
 157
 158#include <unistd.h>
 159#include <stdio.h>
 160#include <sys/stat.h>
 161#include <fcntl.h>
 162#include <stddef.h>
 163#include <stdlib.h>
 164#include <stdarg.h>
 165#include <string.h>
 166#ifdef HAVE_STRINGS_H
 167#include <strings.h> /* for strcasecmp() */
 168#endif
 169#include <errno.h>
 170#include <limits.h>
 171#ifdef NEEDS_SYS_PARAM_H
 172#include <sys/param.h>
 173#endif
 174#include <sys/types.h>
 175#include <dirent.h>
 176#include <sys/time.h>
 177#include <time.h>
 178#include <signal.h>
 179#include <assert.h>
 180#include <regex.h>
 181#include <utime.h>
 182#include <syslog.h>
 183#ifndef NO_SYS_POLL_H
 184#include <sys/poll.h>
 185#else
 186#include <poll.h>
 187#endif
 188#ifdef HAVE_BSD_SYSCTL
 189#include <sys/sysctl.h>
 190#endif
 191
 192#if defined(__MINGW32__)
 193/* pull in Windows compatibility stuff */
 194#include "compat/mingw.h"
 195#elif defined(_MSC_VER)
 196#include "compat/msvc.h"
 197#else
 198#include <sys/utsname.h>
 199#include <sys/wait.h>
 200#include <sys/resource.h>
 201#include <sys/socket.h>
 202#include <sys/ioctl.h>
 203#include <termios.h>
 204#ifndef NO_SYS_SELECT_H
 205#include <sys/select.h>
 206#endif
 207#include <netinet/in.h>
 208#include <netinet/tcp.h>
 209#include <arpa/inet.h>
 210#include <netdb.h>
 211#include <pwd.h>
 212#include <sys/un.h>
 213#ifndef NO_INTTYPES_H
 214#include <inttypes.h>
 215#else
 216#include <stdint.h>
 217#endif
 218#ifdef NO_INTPTR_T
 219/*
 220 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 221 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 222 * while on IP16 and IP16L32 it is "int" (resp. "short")
 223 * Size needs to match (or exceed) 'sizeof(void *)'.
 224 * We can't take "long long" here as not everybody has it.
 225 */
 226typedef long intptr_t;
 227typedef unsigned long uintptr_t;
 228#endif
 229#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 230#include <grp.h>
 231#define _ALL_SOURCE 1
 232#endif
 233
 234/* used on Mac OS X */
 235#ifdef PRECOMPOSE_UNICODE
 236#include "compat/precompose_utf8.h"
 237#else
 238#define precompose_str(in,i_nfd2nfc)
 239#define precompose_argv(c,v)
 240#define probe_utf8_pathname_composition(a,b)
 241#endif
 242
 243#ifdef MKDIR_WO_TRAILING_SLASH
 244#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 245extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 246#endif
 247
 248#ifdef NO_STRUCT_ITIMERVAL
 249struct itimerval {
 250        struct timeval it_interval;
 251        struct timeval it_value;
 252};
 253#endif
 254
 255#ifdef NO_SETITIMER
 256#define setitimer(which,value,ovalue)
 257#endif
 258
 259#ifndef NO_LIBGEN_H
 260#include <libgen.h>
 261#else
 262#define basename gitbasename
 263extern char *gitbasename(char *);
 264#endif
 265
 266#ifndef NO_ICONV
 267#include <iconv.h>
 268#endif
 269
 270#ifndef NO_OPENSSL
 271#ifdef __APPLE__
 272#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 273#include <AvailabilityMacros.h>
 274#undef DEPRECATED_ATTRIBUTE
 275#define DEPRECATED_ATTRIBUTE
 276#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 277#endif
 278#include <openssl/ssl.h>
 279#include <openssl/err.h>
 280#ifdef NO_HMAC_CTX_CLEANUP
 281#define HMAC_CTX_cleanup HMAC_cleanup
 282#endif
 283#endif
 284
 285/* On most systems <netdb.h> would have given us this, but
 286 * not on some systems (e.g. z/OS).
 287 */
 288#ifndef NI_MAXHOST
 289#define NI_MAXHOST 1025
 290#endif
 291
 292#ifndef NI_MAXSERV
 293#define NI_MAXSERV 32
 294#endif
 295
 296/* On most systems <limits.h> would have given us this, but
 297 * not on some systems (e.g. GNU/Hurd).
 298 */
 299#ifndef PATH_MAX
 300#define PATH_MAX 4096
 301#endif
 302
 303#ifndef PRIuMAX
 304#define PRIuMAX "llu"
 305#endif
 306
 307#ifndef SCNuMAX
 308#define SCNuMAX PRIuMAX
 309#endif
 310
 311#ifndef PRIu32
 312#define PRIu32 "u"
 313#endif
 314
 315#ifndef PRIx32
 316#define PRIx32 "x"
 317#endif
 318
 319#ifndef PRIo32
 320#define PRIo32 "o"
 321#endif
 322
 323#ifndef PATH_SEP
 324#define PATH_SEP ':'
 325#endif
 326
 327#ifdef HAVE_PATHS_H
 328#include <paths.h>
 329#endif
 330#ifndef _PATH_DEFPATH
 331#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 332#endif
 333
 334#ifndef STRIP_EXTENSION
 335#define STRIP_EXTENSION ""
 336#endif
 337
 338#ifndef has_dos_drive_prefix
 339static inline int git_has_dos_drive_prefix(const char *path)
 340{
 341        return 0;
 342}
 343#define has_dos_drive_prefix git_has_dos_drive_prefix
 344#endif
 345
 346#ifndef is_dir_sep
 347static inline int git_is_dir_sep(int c)
 348{
 349        return c == '/';
 350}
 351#define is_dir_sep git_is_dir_sep
 352#endif
 353
 354#ifndef offset_1st_component
 355static inline int git_offset_1st_component(const char *path)
 356{
 357        return is_dir_sep(path[0]);
 358}
 359#define offset_1st_component git_offset_1st_component
 360#endif
 361
 362#ifndef find_last_dir_sep
 363static inline char *git_find_last_dir_sep(const char *path)
 364{
 365        return strrchr(path, '/');
 366}
 367#define find_last_dir_sep git_find_last_dir_sep
 368#endif
 369
 370#if defined(__HP_cc) && (__HP_cc >= 61000)
 371#define NORETURN __attribute__((noreturn))
 372#define NORETURN_PTR
 373#elif defined(__GNUC__) && !defined(NO_NORETURN)
 374#define NORETURN __attribute__((__noreturn__))
 375#define NORETURN_PTR __attribute__((__noreturn__))
 376#elif defined(_MSC_VER)
 377#define NORETURN __declspec(noreturn)
 378#define NORETURN_PTR
 379#else
 380#define NORETURN
 381#define NORETURN_PTR
 382#ifndef __GNUC__
 383#ifndef __attribute__
 384#define __attribute__(x)
 385#endif
 386#endif
 387#endif
 388
 389/* The sentinel attribute is valid from gcc version 4.0 */
 390#if defined(__GNUC__) && (__GNUC__ >= 4)
 391#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 392#else
 393#define LAST_ARG_MUST_BE_NULL
 394#endif
 395
 396#include "compat/bswap.h"
 397
 398#include "wildmatch.h"
 399
 400struct strbuf;
 401
 402/* General helper functions */
 403extern void vreportf(const char *prefix, const char *err, va_list params);
 404extern NORETURN void usage(const char *err);
 405extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 406extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 407extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 408extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 409extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 410
 411#ifndef NO_OPENSSL
 412#ifdef APPLE_COMMON_CRYPTO
 413#include "compat/apple-common-crypto.h"
 414#else
 415#include <openssl/evp.h>
 416#include <openssl/hmac.h>
 417#endif /* APPLE_COMMON_CRYPTO */
 418#include <openssl/x509v3.h>
 419#endif /* NO_OPENSSL */
 420
 421/*
 422 * Let callers be aware of the constant return value; this can help
 423 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 424 * because some compilers may not support variadic macros. Since we're only
 425 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 426 * using the function as usual.
 427 */
 428#if defined(__GNUC__)
 429static inline int const_error(void)
 430{
 431        return -1;
 432}
 433#define error(...) (error(__VA_ARGS__), const_error())
 434#endif
 435
 436extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 437extern void set_error_routine(void (*routine)(const char *err, va_list params));
 438extern void set_die_is_recursing_routine(int (*routine)(void));
 439extern void set_error_handle(FILE *);
 440
 441extern int starts_with(const char *str, const char *prefix);
 442
 443/*
 444 * If the string "str" begins with the string found in "prefix", return 1.
 445 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 446 * the string right after the prefix).
 447 *
 448 * Otherwise, return 0 and leave "out" untouched.
 449 *
 450 * Examples:
 451 *
 452 *   [extract branch name, fail if not a branch]
 453 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 454 *      return -1;
 455 *
 456 *   [skip prefix if present, otherwise use whole string]
 457 *   skip_prefix(name, "refs/heads/", &name);
 458 */
 459static inline int skip_prefix(const char *str, const char *prefix,
 460                              const char **out)
 461{
 462        do {
 463                if (!*prefix) {
 464                        *out = str;
 465                        return 1;
 466                }
 467        } while (*str++ == *prefix++);
 468        return 0;
 469}
 470
 471/*
 472 * If buf ends with suffix, return 1 and subtract the length of the suffix
 473 * from *len. Otherwise, return 0 and leave *len untouched.
 474 */
 475static inline int strip_suffix_mem(const char *buf, size_t *len,
 476                                   const char *suffix)
 477{
 478        size_t suflen = strlen(suffix);
 479        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 480                return 0;
 481        *len -= suflen;
 482        return 1;
 483}
 484
 485/*
 486 * If str ends with suffix, return 1 and set *len to the size of the string
 487 * without the suffix. Otherwise, return 0 and set *len to the size of the
 488 * string.
 489 *
 490 * Note that we do _not_ NUL-terminate str to the new length.
 491 */
 492static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 493{
 494        *len = strlen(str);
 495        return strip_suffix_mem(str, len, suffix);
 496}
 497
 498static inline int ends_with(const char *str, const char *suffix)
 499{
 500        size_t len;
 501        return strip_suffix(str, suffix, &len);
 502}
 503
 504#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 505
 506#ifndef PROT_READ
 507#define PROT_READ 1
 508#define PROT_WRITE 2
 509#define MAP_PRIVATE 1
 510#endif
 511
 512#define mmap git_mmap
 513#define munmap git_munmap
 514extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 515extern int git_munmap(void *start, size_t length);
 516
 517#else /* NO_MMAP || USE_WIN32_MMAP */
 518
 519#include <sys/mman.h>
 520
 521#endif /* NO_MMAP || USE_WIN32_MMAP */
 522
 523#ifdef NO_MMAP
 524
 525/* This value must be multiple of (pagesize * 2) */
 526#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 527
 528#else /* NO_MMAP */
 529
 530/* This value must be multiple of (pagesize * 2) */
 531#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 532        (sizeof(void*) >= 8 \
 533                ?  1 * 1024 * 1024 * 1024 \
 534                : 32 * 1024 * 1024)
 535
 536#endif /* NO_MMAP */
 537
 538#ifndef MAP_FAILED
 539#define MAP_FAILED ((void *)-1)
 540#endif
 541
 542#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 543#define on_disk_bytes(st) ((st).st_size)
 544#else
 545#define on_disk_bytes(st) ((st).st_blocks * 512)
 546#endif
 547
 548#ifdef NEEDS_MODE_TRANSLATION
 549#undef S_IFMT
 550#undef S_IFREG
 551#undef S_IFDIR
 552#undef S_IFLNK
 553#undef S_IFBLK
 554#undef S_IFCHR
 555#undef S_IFIFO
 556#undef S_IFSOCK
 557#define S_IFMT   0170000
 558#define S_IFREG  0100000
 559#define S_IFDIR  0040000
 560#define S_IFLNK  0120000
 561#define S_IFBLK  0060000
 562#define S_IFCHR  0020000
 563#define S_IFIFO  0010000
 564#define S_IFSOCK 0140000
 565#ifdef stat
 566#undef stat
 567#endif
 568#define stat(path, buf) git_stat(path, buf)
 569extern int git_stat(const char *, struct stat *);
 570#ifdef fstat
 571#undef fstat
 572#endif
 573#define fstat(fd, buf) git_fstat(fd, buf)
 574extern int git_fstat(int, struct stat *);
 575#ifdef lstat
 576#undef lstat
 577#endif
 578#define lstat(path, buf) git_lstat(path, buf)
 579extern int git_lstat(const char *, struct stat *);
 580#endif
 581
 582#define DEFAULT_PACKED_GIT_LIMIT \
 583        ((1024L * 1024L) * (size_t)(sizeof(void*) >= 8 ? 8192 : 256))
 584
 585#ifdef NO_PREAD
 586#define pread git_pread
 587extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 588#endif
 589/*
 590 * Forward decl that will remind us if its twin in cache.h changes.
 591 * This function is used in compat/pread.c.  But we can't include
 592 * cache.h there.
 593 */
 594extern ssize_t read_in_full(int fd, void *buf, size_t count);
 595
 596#ifdef NO_SETENV
 597#define setenv gitsetenv
 598extern int gitsetenv(const char *, const char *, int);
 599#endif
 600
 601#ifdef NO_MKDTEMP
 602#define mkdtemp gitmkdtemp
 603extern char *gitmkdtemp(char *);
 604#endif
 605
 606#ifdef NO_MKSTEMPS
 607#define mkstemps gitmkstemps
 608extern int gitmkstemps(char *, int);
 609#endif
 610
 611#ifdef NO_UNSETENV
 612#define unsetenv gitunsetenv
 613extern void gitunsetenv(const char *);
 614#endif
 615
 616#ifdef NO_STRCASESTR
 617#define strcasestr gitstrcasestr
 618extern char *gitstrcasestr(const char *haystack, const char *needle);
 619#endif
 620
 621#ifdef NO_STRLCPY
 622#define strlcpy gitstrlcpy
 623extern size_t gitstrlcpy(char *, const char *, size_t);
 624#endif
 625
 626#ifdef NO_STRTOUMAX
 627#define strtoumax gitstrtoumax
 628extern uintmax_t gitstrtoumax(const char *, char **, int);
 629#define strtoimax gitstrtoimax
 630extern intmax_t gitstrtoimax(const char *, char **, int);
 631#endif
 632
 633#ifdef NO_HSTRERROR
 634#define hstrerror githstrerror
 635extern const char *githstrerror(int herror);
 636#endif
 637
 638#ifdef NO_MEMMEM
 639#define memmem gitmemmem
 640void *gitmemmem(const void *haystack, size_t haystacklen,
 641                const void *needle, size_t needlelen);
 642#endif
 643
 644#ifdef NO_GETPAGESIZE
 645#define getpagesize() sysconf(_SC_PAGESIZE)
 646#endif
 647
 648#ifdef FREAD_READS_DIRECTORIES
 649#ifdef fopen
 650#undef fopen
 651#endif
 652#define fopen(a,b) git_fopen(a,b)
 653extern FILE *git_fopen(const char*, const char*);
 654#endif
 655
 656#ifdef SNPRINTF_RETURNS_BOGUS
 657#ifdef snprintf
 658#undef snprintf
 659#endif
 660#define snprintf git_snprintf
 661extern int git_snprintf(char *str, size_t maxsize,
 662                        const char *format, ...);
 663#ifdef vsnprintf
 664#undef vsnprintf
 665#endif
 666#define vsnprintf git_vsnprintf
 667extern int git_vsnprintf(char *str, size_t maxsize,
 668                         const char *format, va_list ap);
 669#endif
 670
 671#ifdef __GLIBC_PREREQ
 672#if __GLIBC_PREREQ(2, 1)
 673#define HAVE_STRCHRNUL
 674#define HAVE_MEMPCPY
 675#endif
 676#endif
 677
 678#ifndef HAVE_STRCHRNUL
 679#define strchrnul gitstrchrnul
 680static inline char *gitstrchrnul(const char *s, int c)
 681{
 682        while (*s && *s != c)
 683                s++;
 684        return (char *)s;
 685}
 686#endif
 687
 688#ifndef HAVE_MEMPCPY
 689#define mempcpy gitmempcpy
 690static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 691{
 692        return (char *)memcpy(dest, src, n) + n;
 693}
 694#endif
 695
 696#ifdef NO_INET_PTON
 697int inet_pton(int af, const char *src, void *dst);
 698#endif
 699
 700#ifdef NO_INET_NTOP
 701const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 702#endif
 703
 704#ifdef NO_PTHREADS
 705#define atexit git_atexit
 706extern int git_atexit(void (*handler)(void));
 707#endif
 708
 709extern void release_pack_memory(size_t);
 710
 711typedef void (*try_to_free_t)(size_t);
 712extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 713
 714static inline size_t st_add(size_t a, size_t b)
 715{
 716        if (unsigned_add_overflows(a, b))
 717                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 718                    (uintmax_t)a, (uintmax_t)b);
 719        return a + b;
 720}
 721#define st_add3(a,b,c)   st_add((a),st_add((b),(c)))
 722#define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
 723
 724static inline size_t st_mult(size_t a, size_t b)
 725{
 726        if (unsigned_mult_overflows(a, b))
 727                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 728                    (uintmax_t)a, (uintmax_t)b);
 729        return a * b;
 730}
 731
 732static inline size_t st_sub(size_t a, size_t b)
 733{
 734        if (a < b)
 735                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 736                    (uintmax_t)a, (uintmax_t)b);
 737        return a - b;
 738}
 739
 740#ifdef HAVE_ALLOCA_H
 741# include <alloca.h>
 742# define xalloca(size)      (alloca(size))
 743# define xalloca_free(p)    do {} while (0)
 744#else
 745# define xalloca(size)      (xmalloc(size))
 746# define xalloca_free(p)    (free(p))
 747#endif
 748extern char *xstrdup(const char *str);
 749extern void *xmalloc(size_t size);
 750extern void *xmallocz(size_t size);
 751extern void *xmallocz_gently(size_t size);
 752extern void *xmemdupz(const void *data, size_t len);
 753extern char *xstrndup(const char *str, size_t len);
 754extern void *xrealloc(void *ptr, size_t size);
 755extern void *xcalloc(size_t nmemb, size_t size);
 756extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 757extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 758extern int xopen(const char *path, int flags, ...);
 759extern ssize_t xread(int fd, void *buf, size_t len);
 760extern ssize_t xwrite(int fd, const void *buf, size_t len);
 761extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 762extern int xdup(int fd);
 763extern FILE *xfopen(const char *path, const char *mode);
 764extern FILE *xfdopen(int fd, const char *mode);
 765extern int xmkstemp(char *template);
 766extern int xmkstemp_mode(char *template, int mode);
 767extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 768extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 769extern char *xgetcwd(void);
 770
 771#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 772
 773static inline char *xstrdup_or_null(const char *str)
 774{
 775        return str ? xstrdup(str) : NULL;
 776}
 777
 778static inline size_t xsize_t(off_t len)
 779{
 780        if (len > (size_t) len)
 781                die("Cannot handle files this big");
 782        return (size_t)len;
 783}
 784
 785/* in ctype.c, for kwset users */
 786extern const unsigned char tolower_trans_tbl[256];
 787
 788/* Sane ctype - no locale, and works with signed chars */
 789#undef isascii
 790#undef isspace
 791#undef isdigit
 792#undef isalpha
 793#undef isalnum
 794#undef isprint
 795#undef islower
 796#undef isupper
 797#undef tolower
 798#undef toupper
 799#undef iscntrl
 800#undef ispunct
 801#undef isxdigit
 802
 803extern const unsigned char sane_ctype[256];
 804#define GIT_SPACE 0x01
 805#define GIT_DIGIT 0x02
 806#define GIT_ALPHA 0x04
 807#define GIT_GLOB_SPECIAL 0x08
 808#define GIT_REGEX_SPECIAL 0x10
 809#define GIT_PATHSPEC_MAGIC 0x20
 810#define GIT_CNTRL 0x40
 811#define GIT_PUNCT 0x80
 812#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 813#define isascii(x) (((x) & ~0x7f) == 0)
 814#define isspace(x) sane_istest(x,GIT_SPACE)
 815#define isdigit(x) sane_istest(x,GIT_DIGIT)
 816#define isalpha(x) sane_istest(x,GIT_ALPHA)
 817#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 818#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 819#define islower(x) sane_iscase(x, 1)
 820#define isupper(x) sane_iscase(x, 0)
 821#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 822#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 823#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 824#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 825                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 826#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 827#define tolower(x) sane_case((unsigned char)(x), 0x20)
 828#define toupper(x) sane_case((unsigned char)(x), 0)
 829#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 830
 831static inline int sane_case(int x, int high)
 832{
 833        if (sane_istest(x, GIT_ALPHA))
 834                x = (x & ~0x20) | high;
 835        return x;
 836}
 837
 838static inline int sane_iscase(int x, int is_lower)
 839{
 840        if (!sane_istest(x, GIT_ALPHA))
 841                return 0;
 842
 843        if (is_lower)
 844                return (x & 0x20) != 0;
 845        else
 846                return (x & 0x20) == 0;
 847}
 848
 849static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 850{
 851        unsigned long ul;
 852        char *p;
 853
 854        errno = 0;
 855        ul = strtoul(s, &p, base);
 856        if (errno || *p || p == s || (unsigned int) ul != ul)
 857                return -1;
 858        *result = ul;
 859        return 0;
 860}
 861
 862static inline int strtol_i(char const *s, int base, int *result)
 863{
 864        long ul;
 865        char *p;
 866
 867        errno = 0;
 868        ul = strtol(s, &p, base);
 869        if (errno || *p || p == s || (int) ul != ul)
 870                return -1;
 871        *result = ul;
 872        return 0;
 873}
 874
 875#ifdef INTERNAL_QSORT
 876void git_qsort(void *base, size_t nmemb, size_t size,
 877               int(*compar)(const void *, const void *));
 878#define qsort git_qsort
 879#endif
 880
 881#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 882# define FORCE_DIR_SET_GID S_ISGID
 883#else
 884# define FORCE_DIR_SET_GID 0
 885#endif
 886
 887#ifdef NO_NSEC
 888#undef USE_NSEC
 889#define ST_CTIME_NSEC(st) 0
 890#define ST_MTIME_NSEC(st) 0
 891#else
 892#ifdef USE_ST_TIMESPEC
 893#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 894#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 895#else
 896#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 897#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 898#endif
 899#endif
 900
 901#ifdef UNRELIABLE_FSTAT
 902#define fstat_is_reliable() 0
 903#else
 904#define fstat_is_reliable() 1
 905#endif
 906
 907#ifndef va_copy
 908/*
 909 * Since an obvious implementation of va_list would be to make it a
 910 * pointer into the stack frame, a simple assignment will work on
 911 * many systems.  But let's try to be more portable.
 912 */
 913#ifdef __va_copy
 914#define va_copy(dst, src) __va_copy(dst, src)
 915#else
 916#define va_copy(dst, src) ((dst) = (src))
 917#endif
 918#endif
 919
 920#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 921#define HAVE_VARIADIC_MACROS 1
 922#endif
 923
 924/*
 925 * Preserves errno, prints a message, but gives no warning for ENOENT.
 926 * Returns 0 on success, which includes trying to unlink an object that does
 927 * not exist.
 928 */
 929int unlink_or_warn(const char *path);
 930 /*
 931  * Tries to unlink file.  Returns 0 if unlink succeeded
 932  * or the file already didn't exist.  Returns -1 and
 933  * appends a message to err suitable for
 934  * 'error("%s", err->buf)' on error.
 935  */
 936int unlink_or_msg(const char *file, struct strbuf *err);
 937/*
 938 * Preserves errno, prints a message, but gives no warning for ENOENT.
 939 * Returns 0 on success, which includes trying to remove a directory that does
 940 * not exist.
 941 */
 942int rmdir_or_warn(const char *path);
 943/*
 944 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 945 * the supplied file mode.
 946 */
 947int remove_or_warn(unsigned int mode, const char *path);
 948
 949/*
 950 * Call access(2), but warn for any error except "missing file"
 951 * (ENOENT or ENOTDIR).
 952 */
 953#define ACCESS_EACCES_OK (1U << 0)
 954int access_or_warn(const char *path, int mode, unsigned flag);
 955int access_or_die(const char *path, int mode, unsigned flag);
 956
 957/* Warn on an inaccessible file that ought to be accessible */
 958void warn_on_inaccessible(const char *path);
 959
 960#ifdef GMTIME_UNRELIABLE_ERRORS
 961struct tm *git_gmtime(const time_t *);
 962struct tm *git_gmtime_r(const time_t *, struct tm *);
 963#define gmtime git_gmtime
 964#define gmtime_r git_gmtime_r
 965#endif
 966
 967#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 968#define USE_PARENS_AROUND_GETTEXT_N 1
 969#endif
 970
 971#ifndef SHELL_PATH
 972# define SHELL_PATH "/bin/sh"
 973#endif
 974
 975#ifndef _POSIX_THREAD_SAFE_FUNCTIONS
 976#define flockfile(fh)
 977#define funlockfile(fh)
 978#define getc_unlocked(fh) getc(fh)
 979#endif
 980
 981#endif