Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit remote.c: hoist read_config into remote_get_1 (8770e6f)
   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#ifndef FLEX_ARRAY
   7/*
   8 * See if our compiler is known to support flexible array members.
   9 */
  10#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && (!defined(__SUNPRO_C) || (__SUNPRO_C > 0x580))
  11# define FLEX_ARRAY /* empty */
  12#elif defined(__GNUC__)
  13# if (__GNUC__ >= 3)
  14#  define FLEX_ARRAY /* empty */
  15# else
  16#  define FLEX_ARRAY 0 /* older GNU extension */
  17# endif
  18#endif
  19
  20/*
  21 * Otherwise, default to safer but a bit wasteful traditional style
  22 */
  23#ifndef FLEX_ARRAY
  24# define FLEX_ARRAY 1
  25#endif
  26#endif
  27
  28#define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  29#define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  30
  31#define maximum_signed_value_of_type(a) \
  32    (INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
  33
  34#define maximum_unsigned_value_of_type(a) \
  35    (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
  36
  37/*
  38 * Signed integer overflow is undefined in C, so here's a helper macro
  39 * to detect if the sum of two integers will overflow.
  40 *
  41 * Requires: a >= 0, typeof(a) equals typeof(b)
  42 */
  43#define signed_add_overflows(a, b) \
  44    ((b) > maximum_signed_value_of_type(a) - (a))
  45
  46#define unsigned_add_overflows(a, b) \
  47    ((b) > maximum_unsigned_value_of_type(a) - (a))
  48
  49#ifdef __GNUC__
  50#define TYPEOF(x) (__typeof__(x))
  51#else
  52#define TYPEOF(x)
  53#endif
  54
  55#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  56#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  57
  58#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  59
  60/* Approximation of the length of the decimal representation of this type. */
  61#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  62
  63#if defined(__sun__)
  64 /*
  65  * On Solaris, when _XOPEN_EXTENDED is set, its header file
  66  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  67  * setting to say we are XPG5 or XPG6.  Also on Solaris,
  68  * XPG6 programs must be compiled with a c99 compiler, while
  69  * non XPG6 programs must be compiled with a pre-c99 compiler.
  70  */
  71# if __STDC_VERSION__ - 0 >= 199901L
  72# define _XOPEN_SOURCE 600
  73# else
  74# define _XOPEN_SOURCE 500
  75# endif
  76#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  77      !defined(_M_UNIX) && !defined(__sgi) && !defined(__DragonFly__) && \
  78      !defined(__TANDEM) && !defined(__QNX__) && !defined(__MirBSD__) && \
  79      !defined(__CYGWIN__)
  80#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  81#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  82#endif
  83#define _ALL_SOURCE 1
  84#define _GNU_SOURCE 1
  85#define _BSD_SOURCE 1
  86#define _DEFAULT_SOURCE 1
  87#define _NETBSD_SOURCE 1
  88#define _SGI_SOURCE 1
  89
  90#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  91# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  92#  define _WIN32_WINNT 0x0502
  93# endif
  94#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  95#include <winsock2.h>
  96#include <windows.h>
  97#define GIT_WINDOWS_NATIVE
  98#endif
  99
 100#include <unistd.h>
 101#include <stdio.h>
 102#include <sys/stat.h>
 103#include <fcntl.h>
 104#include <stddef.h>
 105#include <stdlib.h>
 106#include <stdarg.h>
 107#include <string.h>
 108#ifdef HAVE_STRINGS_H
 109#include <strings.h> /* for strcasecmp() */
 110#endif
 111#include <errno.h>
 112#include <limits.h>
 113#ifdef NEEDS_SYS_PARAM_H
 114#include <sys/param.h>
 115#endif
 116#include <sys/types.h>
 117#include <dirent.h>
 118#include <sys/time.h>
 119#include <time.h>
 120#include <signal.h>
 121#include <assert.h>
 122#include <regex.h>
 123#include <utime.h>
 124#include <syslog.h>
 125#ifndef NO_SYS_POLL_H
 126#include <sys/poll.h>
 127#else
 128#include <poll.h>
 129#endif
 130#ifdef HAVE_BSD_SYSCTL
 131#include <sys/sysctl.h>
 132#endif
 133
 134#if defined(__MINGW32__)
 135/* pull in Windows compatibility stuff */
 136#include "compat/mingw.h"
 137#elif defined(_MSC_VER)
 138#include "compat/msvc.h"
 139#else
 140#include <sys/wait.h>
 141#include <sys/resource.h>
 142#include <sys/socket.h>
 143#include <sys/ioctl.h>
 144#include <termios.h>
 145#ifndef NO_SYS_SELECT_H
 146#include <sys/select.h>
 147#endif
 148#include <netinet/in.h>
 149#include <netinet/tcp.h>
 150#include <arpa/inet.h>
 151#include <netdb.h>
 152#include <pwd.h>
 153#include <sys/un.h>
 154#ifndef NO_INTTYPES_H
 155#include <inttypes.h>
 156#else
 157#include <stdint.h>
 158#endif
 159#ifdef NO_INTPTR_T
 160/*
 161 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 162 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 163 * while on IP16 and IP16L32 it is "int" (resp. "short")
 164 * Size needs to match (or exceed) 'sizeof(void *)'.
 165 * We can't take "long long" here as not everybody has it.
 166 */
 167typedef long intptr_t;
 168typedef unsigned long uintptr_t;
 169#endif
 170#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 171#include <grp.h>
 172#define _ALL_SOURCE 1
 173#endif
 174
 175/* used on Mac OS X */
 176#ifdef PRECOMPOSE_UNICODE
 177#include "compat/precompose_utf8.h"
 178#else
 179#define precompose_str(in,i_nfd2nfc)
 180#define precompose_argv(c,v)
 181#define probe_utf8_pathname_composition(a,b)
 182#endif
 183
 184#ifdef MKDIR_WO_TRAILING_SLASH
 185#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 186extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 187#endif
 188
 189#ifdef NO_STRUCT_ITIMERVAL
 190struct itimerval {
 191        struct timeval it_interval;
 192        struct timeval it_value;
 193};
 194#endif
 195
 196#ifdef NO_SETITIMER
 197#define setitimer(which,value,ovalue)
 198#endif
 199
 200#ifndef NO_LIBGEN_H
 201#include <libgen.h>
 202#else
 203#define basename gitbasename
 204extern char *gitbasename(char *);
 205#endif
 206
 207#ifndef NO_ICONV
 208#include <iconv.h>
 209#endif
 210
 211#ifndef NO_OPENSSL
 212#ifdef __APPLE__
 213#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 214#include <AvailabilityMacros.h>
 215#undef DEPRECATED_ATTRIBUTE
 216#define DEPRECATED_ATTRIBUTE
 217#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 218#endif
 219#include <openssl/ssl.h>
 220#include <openssl/err.h>
 221#ifdef NO_HMAC_CTX_CLEANUP
 222#define HMAC_CTX_cleanup HMAC_cleanup
 223#endif
 224#endif
 225
 226/* On most systems <netdb.h> would have given us this, but
 227 * not on some systems (e.g. z/OS).
 228 */
 229#ifndef NI_MAXHOST
 230#define NI_MAXHOST 1025
 231#endif
 232
 233#ifndef NI_MAXSERV
 234#define NI_MAXSERV 32
 235#endif
 236
 237/* On most systems <limits.h> would have given us this, but
 238 * not on some systems (e.g. GNU/Hurd).
 239 */
 240#ifndef PATH_MAX
 241#define PATH_MAX 4096
 242#endif
 243
 244#ifndef PRIuMAX
 245#define PRIuMAX "llu"
 246#endif
 247
 248#ifndef PRIu32
 249#define PRIu32 "u"
 250#endif
 251
 252#ifndef PRIx32
 253#define PRIx32 "x"
 254#endif
 255
 256#ifndef PRIo32
 257#define PRIo32 "o"
 258#endif
 259
 260#ifndef PATH_SEP
 261#define PATH_SEP ':'
 262#endif
 263
 264#ifdef HAVE_PATHS_H
 265#include <paths.h>
 266#endif
 267#ifndef _PATH_DEFPATH
 268#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 269#endif
 270
 271#ifndef STRIP_EXTENSION
 272#define STRIP_EXTENSION ""
 273#endif
 274
 275#ifndef has_dos_drive_prefix
 276static inline int git_has_dos_drive_prefix(const char *path)
 277{
 278        return 0;
 279}
 280#define has_dos_drive_prefix git_has_dos_drive_prefix
 281#endif
 282
 283#ifndef is_dir_sep
 284static inline int git_is_dir_sep(int c)
 285{
 286        return c == '/';
 287}
 288#define is_dir_sep git_is_dir_sep
 289#endif
 290
 291#ifndef offset_1st_component
 292static inline int git_offset_1st_component(const char *path)
 293{
 294        return is_dir_sep(path[0]);
 295}
 296#define offset_1st_component git_offset_1st_component
 297#endif
 298
 299#ifndef find_last_dir_sep
 300static inline char *git_find_last_dir_sep(const char *path)
 301{
 302        return strrchr(path, '/');
 303}
 304#define find_last_dir_sep git_find_last_dir_sep
 305#endif
 306
 307#if defined(__HP_cc) && (__HP_cc >= 61000)
 308#define NORETURN __attribute__((noreturn))
 309#define NORETURN_PTR
 310#elif defined(__GNUC__) && !defined(NO_NORETURN)
 311#define NORETURN __attribute__((__noreturn__))
 312#define NORETURN_PTR __attribute__((__noreturn__))
 313#elif defined(_MSC_VER)
 314#define NORETURN __declspec(noreturn)
 315#define NORETURN_PTR
 316#else
 317#define NORETURN
 318#define NORETURN_PTR
 319#ifndef __GNUC__
 320#ifndef __attribute__
 321#define __attribute__(x)
 322#endif
 323#endif
 324#endif
 325
 326/* The sentinel attribute is valid from gcc version 4.0 */
 327#if defined(__GNUC__) && (__GNUC__ >= 4)
 328#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 329#else
 330#define LAST_ARG_MUST_BE_NULL
 331#endif
 332
 333#include "compat/bswap.h"
 334
 335#include "wildmatch.h"
 336
 337struct strbuf;
 338
 339/* General helper functions */
 340extern void vreportf(const char *prefix, const char *err, va_list params);
 341extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 342extern NORETURN void usage(const char *err);
 343extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 344extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 345extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 346extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 347extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 348
 349#ifndef NO_OPENSSL
 350#ifdef APPLE_COMMON_CRYPTO
 351#include "compat/apple-common-crypto.h"
 352#else
 353#include <openssl/evp.h>
 354#include <openssl/hmac.h>
 355#endif /* APPLE_COMMON_CRYPTO */
 356#include <openssl/x509v3.h>
 357#endif /* NO_OPENSSL */
 358
 359/*
 360 * Let callers be aware of the constant return value; this can help
 361 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 362 * because some compilers may not support variadic macros. Since we're only
 363 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 364 * using the function as usual.
 365 */
 366#if defined(__GNUC__)
 367static inline int const_error(void)
 368{
 369        return -1;
 370}
 371#define error(...) (error(__VA_ARGS__), const_error())
 372#endif
 373
 374extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 375extern void set_error_routine(void (*routine)(const char *err, va_list params));
 376extern void set_die_is_recursing_routine(int (*routine)(void));
 377
 378extern int starts_with(const char *str, const char *prefix);
 379
 380/*
 381 * If the string "str" begins with the string found in "prefix", return 1.
 382 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 383 * the string right after the prefix).
 384 *
 385 * Otherwise, return 0 and leave "out" untouched.
 386 *
 387 * Examples:
 388 *
 389 *   [extract branch name, fail if not a branch]
 390 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 391 *      return -1;
 392 *
 393 *   [skip prefix if present, otherwise use whole string]
 394 *   skip_prefix(name, "refs/heads/", &name);
 395 */
 396static inline int skip_prefix(const char *str, const char *prefix,
 397                              const char **out)
 398{
 399        do {
 400                if (!*prefix) {
 401                        *out = str;
 402                        return 1;
 403                }
 404        } while (*str++ == *prefix++);
 405        return 0;
 406}
 407
 408/*
 409 * If buf ends with suffix, return 1 and subtract the length of the suffix
 410 * from *len. Otherwise, return 0 and leave *len untouched.
 411 */
 412static inline int strip_suffix_mem(const char *buf, size_t *len,
 413                                   const char *suffix)
 414{
 415        size_t suflen = strlen(suffix);
 416        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 417                return 0;
 418        *len -= suflen;
 419        return 1;
 420}
 421
 422/*
 423 * If str ends with suffix, return 1 and set *len to the size of the string
 424 * without the suffix. Otherwise, return 0 and set *len to the size of the
 425 * string.
 426 *
 427 * Note that we do _not_ NUL-terminate str to the new length.
 428 */
 429static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 430{
 431        *len = strlen(str);
 432        return strip_suffix_mem(str, len, suffix);
 433}
 434
 435static inline int ends_with(const char *str, const char *suffix)
 436{
 437        size_t len;
 438        return strip_suffix(str, suffix, &len);
 439}
 440
 441#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 442
 443#ifndef PROT_READ
 444#define PROT_READ 1
 445#define PROT_WRITE 2
 446#define MAP_PRIVATE 1
 447#endif
 448
 449#define mmap git_mmap
 450#define munmap git_munmap
 451extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 452extern int git_munmap(void *start, size_t length);
 453
 454#else /* NO_MMAP || USE_WIN32_MMAP */
 455
 456#include <sys/mman.h>
 457
 458#endif /* NO_MMAP || USE_WIN32_MMAP */
 459
 460#ifdef NO_MMAP
 461
 462/* This value must be multiple of (pagesize * 2) */
 463#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 464
 465#else /* NO_MMAP */
 466
 467/* This value must be multiple of (pagesize * 2) */
 468#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 469        (sizeof(void*) >= 8 \
 470                ?  1 * 1024 * 1024 * 1024 \
 471                : 32 * 1024 * 1024)
 472
 473#endif /* NO_MMAP */
 474
 475#ifndef MAP_FAILED
 476#define MAP_FAILED ((void *)-1)
 477#endif
 478
 479#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 480#define on_disk_bytes(st) ((st).st_size)
 481#else
 482#define on_disk_bytes(st) ((st).st_blocks * 512)
 483#endif
 484
 485#ifdef NEEDS_MODE_TRANSLATION
 486#undef S_IFMT
 487#undef S_IFREG
 488#undef S_IFDIR
 489#undef S_IFLNK
 490#undef S_IFBLK
 491#undef S_IFCHR
 492#undef S_IFIFO
 493#undef S_IFSOCK
 494#define S_IFMT   0170000
 495#define S_IFREG  0100000
 496#define S_IFDIR  0040000
 497#define S_IFLNK  0120000
 498#define S_IFBLK  0060000
 499#define S_IFCHR  0020000
 500#define S_IFIFO  0010000
 501#define S_IFSOCK 0140000
 502#ifdef stat
 503#undef stat
 504#endif
 505#define stat(path, buf) git_stat(path, buf)
 506extern int git_stat(const char *, struct stat *);
 507#ifdef fstat
 508#undef fstat
 509#endif
 510#define fstat(fd, buf) git_fstat(fd, buf)
 511extern int git_fstat(int, struct stat *);
 512#ifdef lstat
 513#undef lstat
 514#endif
 515#define lstat(path, buf) git_lstat(path, buf)
 516extern int git_lstat(const char *, struct stat *);
 517#endif
 518
 519#define DEFAULT_PACKED_GIT_LIMIT \
 520        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 521
 522#ifdef NO_PREAD
 523#define pread git_pread
 524extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 525#endif
 526/*
 527 * Forward decl that will remind us if its twin in cache.h changes.
 528 * This function is used in compat/pread.c.  But we can't include
 529 * cache.h there.
 530 */
 531extern ssize_t read_in_full(int fd, void *buf, size_t count);
 532
 533#ifdef NO_SETENV
 534#define setenv gitsetenv
 535extern int gitsetenv(const char *, const char *, int);
 536#endif
 537
 538#ifdef NO_MKDTEMP
 539#define mkdtemp gitmkdtemp
 540extern char *gitmkdtemp(char *);
 541#endif
 542
 543#ifdef NO_MKSTEMPS
 544#define mkstemps gitmkstemps
 545extern int gitmkstemps(char *, int);
 546#endif
 547
 548#ifdef NO_UNSETENV
 549#define unsetenv gitunsetenv
 550extern void gitunsetenv(const char *);
 551#endif
 552
 553#ifdef NO_STRCASESTR
 554#define strcasestr gitstrcasestr
 555extern char *gitstrcasestr(const char *haystack, const char *needle);
 556#endif
 557
 558#ifdef NO_STRLCPY
 559#define strlcpy gitstrlcpy
 560extern size_t gitstrlcpy(char *, const char *, size_t);
 561#endif
 562
 563#ifdef NO_STRTOUMAX
 564#define strtoumax gitstrtoumax
 565extern uintmax_t gitstrtoumax(const char *, char **, int);
 566#define strtoimax gitstrtoimax
 567extern intmax_t gitstrtoimax(const char *, char **, int);
 568#endif
 569
 570#ifdef NO_HSTRERROR
 571#define hstrerror githstrerror
 572extern const char *githstrerror(int herror);
 573#endif
 574
 575#ifdef NO_MEMMEM
 576#define memmem gitmemmem
 577void *gitmemmem(const void *haystack, size_t haystacklen,
 578                const void *needle, size_t needlelen);
 579#endif
 580
 581#ifdef NO_GETPAGESIZE
 582#define getpagesize() sysconf(_SC_PAGESIZE)
 583#endif
 584
 585#ifdef FREAD_READS_DIRECTORIES
 586#ifdef fopen
 587#undef fopen
 588#endif
 589#define fopen(a,b) git_fopen(a,b)
 590extern FILE *git_fopen(const char*, const char*);
 591#endif
 592
 593#ifdef SNPRINTF_RETURNS_BOGUS
 594#ifdef snprintf
 595#undef snprintf
 596#endif
 597#define snprintf git_snprintf
 598extern int git_snprintf(char *str, size_t maxsize,
 599                        const char *format, ...);
 600#ifdef vsnprintf
 601#undef vsnprintf
 602#endif
 603#define vsnprintf git_vsnprintf
 604extern int git_vsnprintf(char *str, size_t maxsize,
 605                         const char *format, va_list ap);
 606#endif
 607
 608#ifdef __GLIBC_PREREQ
 609#if __GLIBC_PREREQ(2, 1)
 610#define HAVE_STRCHRNUL
 611#define HAVE_MEMPCPY
 612#endif
 613#endif
 614
 615#ifndef HAVE_STRCHRNUL
 616#define strchrnul gitstrchrnul
 617static inline char *gitstrchrnul(const char *s, int c)
 618{
 619        while (*s && *s != c)
 620                s++;
 621        return (char *)s;
 622}
 623#endif
 624
 625#ifndef HAVE_MEMPCPY
 626#define mempcpy gitmempcpy
 627static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 628{
 629        return (char *)memcpy(dest, src, n) + n;
 630}
 631#endif
 632
 633#ifdef NO_INET_PTON
 634int inet_pton(int af, const char *src, void *dst);
 635#endif
 636
 637#ifdef NO_INET_NTOP
 638const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 639#endif
 640
 641#ifdef NO_PTHREADS
 642#define atexit git_atexit
 643extern int git_atexit(void (*handler)(void));
 644#endif
 645
 646extern void release_pack_memory(size_t);
 647
 648typedef void (*try_to_free_t)(size_t);
 649extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 650
 651#ifdef HAVE_ALLOCA_H
 652# include <alloca.h>
 653# define xalloca(size)      (alloca(size))
 654# define xalloca_free(p)    do {} while (0)
 655#else
 656# define xalloca(size)      (xmalloc(size))
 657# define xalloca_free(p)    (free(p))
 658#endif
 659extern char *xstrdup(const char *str);
 660extern void *xmalloc(size_t size);
 661extern void *xmallocz(size_t size);
 662extern void *xmallocz_gently(size_t size);
 663extern void *xmemdupz(const void *data, size_t len);
 664extern char *xstrndup(const char *str, size_t len);
 665extern void *xrealloc(void *ptr, size_t size);
 666extern void *xcalloc(size_t nmemb, size_t size);
 667extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 668extern ssize_t xread(int fd, void *buf, size_t len);
 669extern ssize_t xwrite(int fd, const void *buf, size_t len);
 670extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 671extern int xdup(int fd);
 672extern FILE *xfdopen(int fd, const char *mode);
 673extern int xmkstemp(char *template);
 674extern int xmkstemp_mode(char *template, int mode);
 675extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 676extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 677extern char *xgetcwd(void);
 678
 679#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 680
 681static inline char *xstrdup_or_null(const char *str)
 682{
 683        return str ? xstrdup(str) : NULL;
 684}
 685
 686static inline size_t xsize_t(off_t len)
 687{
 688        if (len > (size_t) len)
 689                die("Cannot handle files this big");
 690        return (size_t)len;
 691}
 692
 693/* in ctype.c, for kwset users */
 694extern const unsigned char tolower_trans_tbl[256];
 695
 696/* Sane ctype - no locale, and works with signed chars */
 697#undef isascii
 698#undef isspace
 699#undef isdigit
 700#undef isalpha
 701#undef isalnum
 702#undef isprint
 703#undef islower
 704#undef isupper
 705#undef tolower
 706#undef toupper
 707#undef iscntrl
 708#undef ispunct
 709#undef isxdigit
 710
 711extern const unsigned char sane_ctype[256];
 712#define GIT_SPACE 0x01
 713#define GIT_DIGIT 0x02
 714#define GIT_ALPHA 0x04
 715#define GIT_GLOB_SPECIAL 0x08
 716#define GIT_REGEX_SPECIAL 0x10
 717#define GIT_PATHSPEC_MAGIC 0x20
 718#define GIT_CNTRL 0x40
 719#define GIT_PUNCT 0x80
 720#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 721#define isascii(x) (((x) & ~0x7f) == 0)
 722#define isspace(x) sane_istest(x,GIT_SPACE)
 723#define isdigit(x) sane_istest(x,GIT_DIGIT)
 724#define isalpha(x) sane_istest(x,GIT_ALPHA)
 725#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 726#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 727#define islower(x) sane_iscase(x, 1)
 728#define isupper(x) sane_iscase(x, 0)
 729#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 730#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 731#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 732#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 733                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 734#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 735#define tolower(x) sane_case((unsigned char)(x), 0x20)
 736#define toupper(x) sane_case((unsigned char)(x), 0)
 737#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 738
 739static inline int sane_case(int x, int high)
 740{
 741        if (sane_istest(x, GIT_ALPHA))
 742                x = (x & ~0x20) | high;
 743        return x;
 744}
 745
 746static inline int sane_iscase(int x, int is_lower)
 747{
 748        if (!sane_istest(x, GIT_ALPHA))
 749                return 0;
 750
 751        if (is_lower)
 752                return (x & 0x20) != 0;
 753        else
 754                return (x & 0x20) == 0;
 755}
 756
 757static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 758{
 759        unsigned long ul;
 760        char *p;
 761
 762        errno = 0;
 763        ul = strtoul(s, &p, base);
 764        if (errno || *p || p == s || (unsigned int) ul != ul)
 765                return -1;
 766        *result = ul;
 767        return 0;
 768}
 769
 770static inline int strtol_i(char const *s, int base, int *result)
 771{
 772        long ul;
 773        char *p;
 774
 775        errno = 0;
 776        ul = strtol(s, &p, base);
 777        if (errno || *p || p == s || (int) ul != ul)
 778                return -1;
 779        *result = ul;
 780        return 0;
 781}
 782
 783#ifdef INTERNAL_QSORT
 784void git_qsort(void *base, size_t nmemb, size_t size,
 785               int(*compar)(const void *, const void *));
 786#define qsort git_qsort
 787#endif
 788
 789#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 790# define FORCE_DIR_SET_GID S_ISGID
 791#else
 792# define FORCE_DIR_SET_GID 0
 793#endif
 794
 795#ifdef NO_NSEC
 796#undef USE_NSEC
 797#define ST_CTIME_NSEC(st) 0
 798#define ST_MTIME_NSEC(st) 0
 799#else
 800#ifdef USE_ST_TIMESPEC
 801#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 802#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 803#else
 804#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 805#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 806#endif
 807#endif
 808
 809#ifdef UNRELIABLE_FSTAT
 810#define fstat_is_reliable() 0
 811#else
 812#define fstat_is_reliable() 1
 813#endif
 814
 815#ifndef va_copy
 816/*
 817 * Since an obvious implementation of va_list would be to make it a
 818 * pointer into the stack frame, a simple assignment will work on
 819 * many systems.  But let's try to be more portable.
 820 */
 821#ifdef __va_copy
 822#define va_copy(dst, src) __va_copy(dst, src)
 823#else
 824#define va_copy(dst, src) ((dst) = (src))
 825#endif
 826#endif
 827
 828#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 829#define HAVE_VARIADIC_MACROS 1
 830#endif
 831
 832/*
 833 * Preserves errno, prints a message, but gives no warning for ENOENT.
 834 * Returns 0 on success, which includes trying to unlink an object that does
 835 * not exist.
 836 */
 837int unlink_or_warn(const char *path);
 838 /*
 839  * Tries to unlink file.  Returns 0 if unlink succeeded
 840  * or the file already didn't exist.  Returns -1 and
 841  * appends a message to err suitable for
 842  * 'error("%s", err->buf)' on error.
 843  */
 844int unlink_or_msg(const char *file, struct strbuf *err);
 845/*
 846 * Preserves errno, prints a message, but gives no warning for ENOENT.
 847 * Returns 0 on success, which includes trying to remove a directory that does
 848 * not exist.
 849 */
 850int rmdir_or_warn(const char *path);
 851/*
 852 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 853 * the supplied file mode.
 854 */
 855int remove_or_warn(unsigned int mode, const char *path);
 856
 857/*
 858 * Call access(2), but warn for any error except "missing file"
 859 * (ENOENT or ENOTDIR).
 860 */
 861#define ACCESS_EACCES_OK (1U << 0)
 862int access_or_warn(const char *path, int mode, unsigned flag);
 863int access_or_die(const char *path, int mode, unsigned flag);
 864
 865/* Warn on an inaccessible file that ought to be accessible */
 866void warn_on_inaccessible(const char *path);
 867
 868/* Get the passwd entry for the UID of the current process. */
 869struct passwd *xgetpwuid_self(void);
 870
 871#ifdef GMTIME_UNRELIABLE_ERRORS
 872struct tm *git_gmtime(const time_t *);
 873struct tm *git_gmtime_r(const time_t *, struct tm *);
 874#define gmtime git_gmtime
 875#define gmtime_r git_gmtime_r
 876#endif
 877
 878#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 879#define USE_PARENS_AROUND_GETTEXT_N 1
 880#endif
 881
 882#ifndef SHELL_PATH
 883# define SHELL_PATH "/bin/sh"
 884#endif
 885
 886#endif