Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit name-rev: include taggerdate in considering the best name (7550424)
   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/wait.h>
 199#include <sys/resource.h>
 200#include <sys/socket.h>
 201#include <sys/ioctl.h>
 202#include <termios.h>
 203#ifndef NO_SYS_SELECT_H
 204#include <sys/select.h>
 205#endif
 206#include <netinet/in.h>
 207#include <netinet/tcp.h>
 208#include <arpa/inet.h>
 209#include <netdb.h>
 210#include <pwd.h>
 211#include <sys/un.h>
 212#ifndef NO_INTTYPES_H
 213#include <inttypes.h>
 214#else
 215#include <stdint.h>
 216#endif
 217#ifdef NO_INTPTR_T
 218/*
 219 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 220 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 221 * while on IP16 and IP16L32 it is "int" (resp. "short")
 222 * Size needs to match (or exceed) 'sizeof(void *)'.
 223 * We can't take "long long" here as not everybody has it.
 224 */
 225typedef long intptr_t;
 226typedef unsigned long uintptr_t;
 227#endif
 228#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 229#include <grp.h>
 230#define _ALL_SOURCE 1
 231#endif
 232
 233/* used on Mac OS X */
 234#ifdef PRECOMPOSE_UNICODE
 235#include "compat/precompose_utf8.h"
 236#else
 237#define precompose_str(in,i_nfd2nfc)
 238#define precompose_argv(c,v)
 239#define probe_utf8_pathname_composition(a,b)
 240#endif
 241
 242#ifdef MKDIR_WO_TRAILING_SLASH
 243#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 244extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 245#endif
 246
 247#ifdef NO_STRUCT_ITIMERVAL
 248struct itimerval {
 249        struct timeval it_interval;
 250        struct timeval it_value;
 251};
 252#endif
 253
 254#ifdef NO_SETITIMER
 255#define setitimer(which,value,ovalue)
 256#endif
 257
 258#ifndef NO_LIBGEN_H
 259#include <libgen.h>
 260#else
 261#define basename gitbasename
 262extern char *gitbasename(char *);
 263#endif
 264
 265#ifndef NO_ICONV
 266#include <iconv.h>
 267#endif
 268
 269#ifndef NO_OPENSSL
 270#ifdef __APPLE__
 271#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 272#include <AvailabilityMacros.h>
 273#undef DEPRECATED_ATTRIBUTE
 274#define DEPRECATED_ATTRIBUTE
 275#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 276#endif
 277#include <openssl/ssl.h>
 278#include <openssl/err.h>
 279#ifdef NO_HMAC_CTX_CLEANUP
 280#define HMAC_CTX_cleanup HMAC_cleanup
 281#endif
 282#endif
 283
 284/* On most systems <netdb.h> would have given us this, but
 285 * not on some systems (e.g. z/OS).
 286 */
 287#ifndef NI_MAXHOST
 288#define NI_MAXHOST 1025
 289#endif
 290
 291#ifndef NI_MAXSERV
 292#define NI_MAXSERV 32
 293#endif
 294
 295/* On most systems <limits.h> would have given us this, but
 296 * not on some systems (e.g. GNU/Hurd).
 297 */
 298#ifndef PATH_MAX
 299#define PATH_MAX 4096
 300#endif
 301
 302#ifndef PRIuMAX
 303#define PRIuMAX "llu"
 304#endif
 305
 306#ifndef PRIu32
 307#define PRIu32 "u"
 308#endif
 309
 310#ifndef PRIx32
 311#define PRIx32 "x"
 312#endif
 313
 314#ifndef PRIo32
 315#define PRIo32 "o"
 316#endif
 317
 318#ifndef PATH_SEP
 319#define PATH_SEP ':'
 320#endif
 321
 322#ifdef HAVE_PATHS_H
 323#include <paths.h>
 324#endif
 325#ifndef _PATH_DEFPATH
 326#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 327#endif
 328
 329#ifndef STRIP_EXTENSION
 330#define STRIP_EXTENSION ""
 331#endif
 332
 333#ifndef has_dos_drive_prefix
 334static inline int git_has_dos_drive_prefix(const char *path)
 335{
 336        return 0;
 337}
 338#define has_dos_drive_prefix git_has_dos_drive_prefix
 339#endif
 340
 341#ifndef is_dir_sep
 342static inline int git_is_dir_sep(int c)
 343{
 344        return c == '/';
 345}
 346#define is_dir_sep git_is_dir_sep
 347#endif
 348
 349#ifndef offset_1st_component
 350static inline int git_offset_1st_component(const char *path)
 351{
 352        return is_dir_sep(path[0]);
 353}
 354#define offset_1st_component git_offset_1st_component
 355#endif
 356
 357#ifndef find_last_dir_sep
 358static inline char *git_find_last_dir_sep(const char *path)
 359{
 360        return strrchr(path, '/');
 361}
 362#define find_last_dir_sep git_find_last_dir_sep
 363#endif
 364
 365#if defined(__HP_cc) && (__HP_cc >= 61000)
 366#define NORETURN __attribute__((noreturn))
 367#define NORETURN_PTR
 368#elif defined(__GNUC__) && !defined(NO_NORETURN)
 369#define NORETURN __attribute__((__noreturn__))
 370#define NORETURN_PTR __attribute__((__noreturn__))
 371#elif defined(_MSC_VER)
 372#define NORETURN __declspec(noreturn)
 373#define NORETURN_PTR
 374#else
 375#define NORETURN
 376#define NORETURN_PTR
 377#ifndef __GNUC__
 378#ifndef __attribute__
 379#define __attribute__(x)
 380#endif
 381#endif
 382#endif
 383
 384/* The sentinel attribute is valid from gcc version 4.0 */
 385#if defined(__GNUC__) && (__GNUC__ >= 4)
 386#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 387#else
 388#define LAST_ARG_MUST_BE_NULL
 389#endif
 390
 391#include "compat/bswap.h"
 392
 393#include "wildmatch.h"
 394
 395struct strbuf;
 396
 397/* General helper functions */
 398extern void vreportf(const char *prefix, const char *err, va_list params);
 399extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 400extern NORETURN void usage(const char *err);
 401extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 402extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 403extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 404extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 405extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 406
 407#ifndef NO_OPENSSL
 408#ifdef APPLE_COMMON_CRYPTO
 409#include "compat/apple-common-crypto.h"
 410#else
 411#include <openssl/evp.h>
 412#include <openssl/hmac.h>
 413#endif /* APPLE_COMMON_CRYPTO */
 414#include <openssl/x509v3.h>
 415#endif /* NO_OPENSSL */
 416
 417/*
 418 * Let callers be aware of the constant return value; this can help
 419 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 420 * because some compilers may not support variadic macros. Since we're only
 421 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 422 * using the function as usual.
 423 */
 424#if defined(__GNUC__)
 425static inline int const_error(void)
 426{
 427        return -1;
 428}
 429#define error(...) (error(__VA_ARGS__), const_error())
 430#endif
 431
 432extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 433extern void set_error_routine(void (*routine)(const char *err, va_list params));
 434extern void set_die_is_recursing_routine(int (*routine)(void));
 435
 436extern int starts_with(const char *str, const char *prefix);
 437
 438/*
 439 * If the string "str" begins with the string found in "prefix", return 1.
 440 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 441 * the string right after the prefix).
 442 *
 443 * Otherwise, return 0 and leave "out" untouched.
 444 *
 445 * Examples:
 446 *
 447 *   [extract branch name, fail if not a branch]
 448 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 449 *      return -1;
 450 *
 451 *   [skip prefix if present, otherwise use whole string]
 452 *   skip_prefix(name, "refs/heads/", &name);
 453 */
 454static inline int skip_prefix(const char *str, const char *prefix,
 455                              const char **out)
 456{
 457        do {
 458                if (!*prefix) {
 459                        *out = str;
 460                        return 1;
 461                }
 462        } while (*str++ == *prefix++);
 463        return 0;
 464}
 465
 466/*
 467 * If buf ends with suffix, return 1 and subtract the length of the suffix
 468 * from *len. Otherwise, return 0 and leave *len untouched.
 469 */
 470static inline int strip_suffix_mem(const char *buf, size_t *len,
 471                                   const char *suffix)
 472{
 473        size_t suflen = strlen(suffix);
 474        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 475                return 0;
 476        *len -= suflen;
 477        return 1;
 478}
 479
 480/*
 481 * If str ends with suffix, return 1 and set *len to the size of the string
 482 * without the suffix. Otherwise, return 0 and set *len to the size of the
 483 * string.
 484 *
 485 * Note that we do _not_ NUL-terminate str to the new length.
 486 */
 487static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 488{
 489        *len = strlen(str);
 490        return strip_suffix_mem(str, len, suffix);
 491}
 492
 493static inline int ends_with(const char *str, const char *suffix)
 494{
 495        size_t len;
 496        return strip_suffix(str, suffix, &len);
 497}
 498
 499#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 500
 501#ifndef PROT_READ
 502#define PROT_READ 1
 503#define PROT_WRITE 2
 504#define MAP_PRIVATE 1
 505#endif
 506
 507#define mmap git_mmap
 508#define munmap git_munmap
 509extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 510extern int git_munmap(void *start, size_t length);
 511
 512#else /* NO_MMAP || USE_WIN32_MMAP */
 513
 514#include <sys/mman.h>
 515
 516#endif /* NO_MMAP || USE_WIN32_MMAP */
 517
 518#ifdef NO_MMAP
 519
 520/* This value must be multiple of (pagesize * 2) */
 521#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 522
 523#else /* NO_MMAP */
 524
 525/* This value must be multiple of (pagesize * 2) */
 526#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 527        (sizeof(void*) >= 8 \
 528                ?  1 * 1024 * 1024 * 1024 \
 529                : 32 * 1024 * 1024)
 530
 531#endif /* NO_MMAP */
 532
 533#ifndef MAP_FAILED
 534#define MAP_FAILED ((void *)-1)
 535#endif
 536
 537#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 538#define on_disk_bytes(st) ((st).st_size)
 539#else
 540#define on_disk_bytes(st) ((st).st_blocks * 512)
 541#endif
 542
 543#ifdef NEEDS_MODE_TRANSLATION
 544#undef S_IFMT
 545#undef S_IFREG
 546#undef S_IFDIR
 547#undef S_IFLNK
 548#undef S_IFBLK
 549#undef S_IFCHR
 550#undef S_IFIFO
 551#undef S_IFSOCK
 552#define S_IFMT   0170000
 553#define S_IFREG  0100000
 554#define S_IFDIR  0040000
 555#define S_IFLNK  0120000
 556#define S_IFBLK  0060000
 557#define S_IFCHR  0020000
 558#define S_IFIFO  0010000
 559#define S_IFSOCK 0140000
 560#ifdef stat
 561#undef stat
 562#endif
 563#define stat(path, buf) git_stat(path, buf)
 564extern int git_stat(const char *, struct stat *);
 565#ifdef fstat
 566#undef fstat
 567#endif
 568#define fstat(fd, buf) git_fstat(fd, buf)
 569extern int git_fstat(int, struct stat *);
 570#ifdef lstat
 571#undef lstat
 572#endif
 573#define lstat(path, buf) git_lstat(path, buf)
 574extern int git_lstat(const char *, struct stat *);
 575#endif
 576
 577#define DEFAULT_PACKED_GIT_LIMIT \
 578        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 579
 580#ifdef NO_PREAD
 581#define pread git_pread
 582extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 583#endif
 584/*
 585 * Forward decl that will remind us if its twin in cache.h changes.
 586 * This function is used in compat/pread.c.  But we can't include
 587 * cache.h there.
 588 */
 589extern ssize_t read_in_full(int fd, void *buf, size_t count);
 590
 591#ifdef NO_SETENV
 592#define setenv gitsetenv
 593extern int gitsetenv(const char *, const char *, int);
 594#endif
 595
 596#ifdef NO_MKDTEMP
 597#define mkdtemp gitmkdtemp
 598extern char *gitmkdtemp(char *);
 599#endif
 600
 601#ifdef NO_MKSTEMPS
 602#define mkstemps gitmkstemps
 603extern int gitmkstemps(char *, int);
 604#endif
 605
 606#ifdef NO_UNSETENV
 607#define unsetenv gitunsetenv
 608extern void gitunsetenv(const char *);
 609#endif
 610
 611#ifdef NO_STRCASESTR
 612#define strcasestr gitstrcasestr
 613extern char *gitstrcasestr(const char *haystack, const char *needle);
 614#endif
 615
 616#ifdef NO_STRLCPY
 617#define strlcpy gitstrlcpy
 618extern size_t gitstrlcpy(char *, const char *, size_t);
 619#endif
 620
 621#ifdef NO_STRTOUMAX
 622#define strtoumax gitstrtoumax
 623extern uintmax_t gitstrtoumax(const char *, char **, int);
 624#define strtoimax gitstrtoimax
 625extern intmax_t gitstrtoimax(const char *, char **, int);
 626#endif
 627
 628#ifdef NO_HSTRERROR
 629#define hstrerror githstrerror
 630extern const char *githstrerror(int herror);
 631#endif
 632
 633#ifdef NO_MEMMEM
 634#define memmem gitmemmem
 635void *gitmemmem(const void *haystack, size_t haystacklen,
 636                const void *needle, size_t needlelen);
 637#endif
 638
 639#ifdef NO_GETPAGESIZE
 640#define getpagesize() sysconf(_SC_PAGESIZE)
 641#endif
 642
 643#ifdef FREAD_READS_DIRECTORIES
 644#ifdef fopen
 645#undef fopen
 646#endif
 647#define fopen(a,b) git_fopen(a,b)
 648extern FILE *git_fopen(const char*, const char*);
 649#endif
 650
 651#ifdef SNPRINTF_RETURNS_BOGUS
 652#ifdef snprintf
 653#undef snprintf
 654#endif
 655#define snprintf git_snprintf
 656extern int git_snprintf(char *str, size_t maxsize,
 657                        const char *format, ...);
 658#ifdef vsnprintf
 659#undef vsnprintf
 660#endif
 661#define vsnprintf git_vsnprintf
 662extern int git_vsnprintf(char *str, size_t maxsize,
 663                         const char *format, va_list ap);
 664#endif
 665
 666#ifdef __GLIBC_PREREQ
 667#if __GLIBC_PREREQ(2, 1)
 668#define HAVE_STRCHRNUL
 669#define HAVE_MEMPCPY
 670#endif
 671#endif
 672
 673#ifndef HAVE_STRCHRNUL
 674#define strchrnul gitstrchrnul
 675static inline char *gitstrchrnul(const char *s, int c)
 676{
 677        while (*s && *s != c)
 678                s++;
 679        return (char *)s;
 680}
 681#endif
 682
 683#ifndef HAVE_MEMPCPY
 684#define mempcpy gitmempcpy
 685static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 686{
 687        return (char *)memcpy(dest, src, n) + n;
 688}
 689#endif
 690
 691#ifdef NO_INET_PTON
 692int inet_pton(int af, const char *src, void *dst);
 693#endif
 694
 695#ifdef NO_INET_NTOP
 696const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 697#endif
 698
 699#ifdef NO_PTHREADS
 700#define atexit git_atexit
 701extern int git_atexit(void (*handler)(void));
 702#endif
 703
 704extern void release_pack_memory(size_t);
 705
 706typedef void (*try_to_free_t)(size_t);
 707extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 708
 709static inline size_t st_add(size_t a, size_t b)
 710{
 711        if (unsigned_add_overflows(a, b))
 712                die("size_t overflow: %"PRIuMAX" + %"PRIuMAX,
 713                    (uintmax_t)a, (uintmax_t)b);
 714        return a + b;
 715}
 716#define st_add3(a,b,c)   st_add((a),st_add((b),(c)))
 717#define st_add4(a,b,c,d) st_add((a),st_add3((b),(c),(d)))
 718
 719static inline size_t st_mult(size_t a, size_t b)
 720{
 721        if (unsigned_mult_overflows(a, b))
 722                die("size_t overflow: %"PRIuMAX" * %"PRIuMAX,
 723                    (uintmax_t)a, (uintmax_t)b);
 724        return a * b;
 725}
 726
 727static inline size_t st_sub(size_t a, size_t b)
 728{
 729        if (a < b)
 730                die("size_t underflow: %"PRIuMAX" - %"PRIuMAX,
 731                    (uintmax_t)a, (uintmax_t)b);
 732        return a - b;
 733}
 734
 735#ifdef HAVE_ALLOCA_H
 736# include <alloca.h>
 737# define xalloca(size)      (alloca(size))
 738# define xalloca_free(p)    do {} while (0)
 739#else
 740# define xalloca(size)      (xmalloc(size))
 741# define xalloca_free(p)    (free(p))
 742#endif
 743extern char *xstrdup(const char *str);
 744extern void *xmalloc(size_t size);
 745extern void *xmallocz(size_t size);
 746extern void *xmallocz_gently(size_t size);
 747extern void *xmemdupz(const void *data, size_t len);
 748extern char *xstrndup(const char *str, size_t len);
 749extern void *xrealloc(void *ptr, size_t size);
 750extern void *xcalloc(size_t nmemb, size_t size);
 751extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 752extern void *xmmap_gently(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 753extern ssize_t xread(int fd, void *buf, size_t len);
 754extern ssize_t xwrite(int fd, const void *buf, size_t len);
 755extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 756extern int xdup(int fd);
 757extern FILE *xfdopen(int fd, const char *mode);
 758extern int xmkstemp(char *template);
 759extern int xmkstemp_mode(char *template, int mode);
 760extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 761extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 762extern char *xgetcwd(void);
 763
 764#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 765
 766static inline char *xstrdup_or_null(const char *str)
 767{
 768        return str ? xstrdup(str) : NULL;
 769}
 770
 771static inline size_t xsize_t(off_t len)
 772{
 773        if (len > (size_t) len)
 774                die("Cannot handle files this big");
 775        return (size_t)len;
 776}
 777
 778/* in ctype.c, for kwset users */
 779extern const unsigned char tolower_trans_tbl[256];
 780
 781/* Sane ctype - no locale, and works with signed chars */
 782#undef isascii
 783#undef isspace
 784#undef isdigit
 785#undef isalpha
 786#undef isalnum
 787#undef isprint
 788#undef islower
 789#undef isupper
 790#undef tolower
 791#undef toupper
 792#undef iscntrl
 793#undef ispunct
 794#undef isxdigit
 795
 796extern const unsigned char sane_ctype[256];
 797#define GIT_SPACE 0x01
 798#define GIT_DIGIT 0x02
 799#define GIT_ALPHA 0x04
 800#define GIT_GLOB_SPECIAL 0x08
 801#define GIT_REGEX_SPECIAL 0x10
 802#define GIT_PATHSPEC_MAGIC 0x20
 803#define GIT_CNTRL 0x40
 804#define GIT_PUNCT 0x80
 805#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 806#define isascii(x) (((x) & ~0x7f) == 0)
 807#define isspace(x) sane_istest(x,GIT_SPACE)
 808#define isdigit(x) sane_istest(x,GIT_DIGIT)
 809#define isalpha(x) sane_istest(x,GIT_ALPHA)
 810#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 811#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 812#define islower(x) sane_iscase(x, 1)
 813#define isupper(x) sane_iscase(x, 0)
 814#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 815#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 816#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 817#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 818                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 819#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 820#define tolower(x) sane_case((unsigned char)(x), 0x20)
 821#define toupper(x) sane_case((unsigned char)(x), 0)
 822#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 823
 824static inline int sane_case(int x, int high)
 825{
 826        if (sane_istest(x, GIT_ALPHA))
 827                x = (x & ~0x20) | high;
 828        return x;
 829}
 830
 831static inline int sane_iscase(int x, int is_lower)
 832{
 833        if (!sane_istest(x, GIT_ALPHA))
 834                return 0;
 835
 836        if (is_lower)
 837                return (x & 0x20) != 0;
 838        else
 839                return (x & 0x20) == 0;
 840}
 841
 842static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 843{
 844        unsigned long ul;
 845        char *p;
 846
 847        errno = 0;
 848        ul = strtoul(s, &p, base);
 849        if (errno || *p || p == s || (unsigned int) ul != ul)
 850                return -1;
 851        *result = ul;
 852        return 0;
 853}
 854
 855static inline int strtol_i(char const *s, int base, int *result)
 856{
 857        long ul;
 858        char *p;
 859
 860        errno = 0;
 861        ul = strtol(s, &p, base);
 862        if (errno || *p || p == s || (int) ul != ul)
 863                return -1;
 864        *result = ul;
 865        return 0;
 866}
 867
 868#ifdef INTERNAL_QSORT
 869void git_qsort(void *base, size_t nmemb, size_t size,
 870               int(*compar)(const void *, const void *));
 871#define qsort git_qsort
 872#endif
 873
 874#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 875# define FORCE_DIR_SET_GID S_ISGID
 876#else
 877# define FORCE_DIR_SET_GID 0
 878#endif
 879
 880#ifdef NO_NSEC
 881#undef USE_NSEC
 882#define ST_CTIME_NSEC(st) 0
 883#define ST_MTIME_NSEC(st) 0
 884#else
 885#ifdef USE_ST_TIMESPEC
 886#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 887#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 888#else
 889#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 890#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 891#endif
 892#endif
 893
 894#ifdef UNRELIABLE_FSTAT
 895#define fstat_is_reliable() 0
 896#else
 897#define fstat_is_reliable() 1
 898#endif
 899
 900#ifndef va_copy
 901/*
 902 * Since an obvious implementation of va_list would be to make it a
 903 * pointer into the stack frame, a simple assignment will work on
 904 * many systems.  But let's try to be more portable.
 905 */
 906#ifdef __va_copy
 907#define va_copy(dst, src) __va_copy(dst, src)
 908#else
 909#define va_copy(dst, src) ((dst) = (src))
 910#endif
 911#endif
 912
 913#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 914#define HAVE_VARIADIC_MACROS 1
 915#endif
 916
 917/*
 918 * Preserves errno, prints a message, but gives no warning for ENOENT.
 919 * Returns 0 on success, which includes trying to unlink an object that does
 920 * not exist.
 921 */
 922int unlink_or_warn(const char *path);
 923 /*
 924  * Tries to unlink file.  Returns 0 if unlink succeeded
 925  * or the file already didn't exist.  Returns -1 and
 926  * appends a message to err suitable for
 927  * 'error("%s", err->buf)' on error.
 928  */
 929int unlink_or_msg(const char *file, struct strbuf *err);
 930/*
 931 * Preserves errno, prints a message, but gives no warning for ENOENT.
 932 * Returns 0 on success, which includes trying to remove a directory that does
 933 * not exist.
 934 */
 935int rmdir_or_warn(const char *path);
 936/*
 937 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 938 * the supplied file mode.
 939 */
 940int remove_or_warn(unsigned int mode, const char *path);
 941
 942/*
 943 * Call access(2), but warn for any error except "missing file"
 944 * (ENOENT or ENOTDIR).
 945 */
 946#define ACCESS_EACCES_OK (1U << 0)
 947int access_or_warn(const char *path, int mode, unsigned flag);
 948int access_or_die(const char *path, int mode, unsigned flag);
 949
 950/* Warn on an inaccessible file that ought to be accessible */
 951void warn_on_inaccessible(const char *path);
 952
 953/* Get the passwd entry for the UID of the current process. */
 954struct passwd *xgetpwuid_self(void);
 955
 956#ifdef GMTIME_UNRELIABLE_ERRORS
 957struct tm *git_gmtime(const time_t *);
 958struct tm *git_gmtime_r(const time_t *, struct tm *);
 959#define gmtime git_gmtime
 960#define gmtime_r git_gmtime_r
 961#endif
 962
 963#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 964#define USE_PARENS_AROUND_GETTEXT_N 1
 965#endif
 966
 967#ifndef SHELL_PATH
 968# define SHELL_PATH "/bin/sh"
 969#endif
 970
 971#endif