Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit untracked: fix detection of uname(2) failure (100e433)
   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
 131#if defined(__MINGW32__)
 132/* pull in Windows compatibility stuff */
 133#include "compat/mingw.h"
 134#elif defined(_MSC_VER)
 135#include "compat/msvc.h"
 136#else
 137#include <sys/utsname.h>
 138#include <sys/wait.h>
 139#include <sys/resource.h>
 140#include <sys/socket.h>
 141#include <sys/ioctl.h>
 142#include <termios.h>
 143#ifndef NO_SYS_SELECT_H
 144#include <sys/select.h>
 145#endif
 146#include <netinet/in.h>
 147#include <netinet/tcp.h>
 148#include <arpa/inet.h>
 149#include <netdb.h>
 150#include <pwd.h>
 151#include <sys/un.h>
 152#ifndef NO_INTTYPES_H
 153#include <inttypes.h>
 154#else
 155#include <stdint.h>
 156#endif
 157#ifdef NO_INTPTR_T
 158/*
 159 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 160 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 161 * while on IP16 and IP16L32 it is "int" (resp. "short")
 162 * Size needs to match (or exceed) 'sizeof(void *)'.
 163 * We can't take "long long" here as not everybody has it.
 164 */
 165typedef long intptr_t;
 166typedef unsigned long uintptr_t;
 167#endif
 168#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 169#include <grp.h>
 170#define _ALL_SOURCE 1
 171#endif
 172
 173/* used on Mac OS X */
 174#ifdef PRECOMPOSE_UNICODE
 175#include "compat/precompose_utf8.h"
 176#else
 177#define precompose_str(in,i_nfd2nfc)
 178#define precompose_argv(c,v)
 179#define probe_utf8_pathname_composition(a,b)
 180#endif
 181
 182#ifdef MKDIR_WO_TRAILING_SLASH
 183#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 184extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 185#endif
 186
 187#ifdef NO_STRUCT_ITIMERVAL
 188struct itimerval {
 189        struct timeval it_interval;
 190        struct timeval it_value;
 191};
 192#endif
 193
 194#ifdef NO_SETITIMER
 195#define setitimer(which,value,ovalue)
 196#endif
 197
 198#ifndef NO_LIBGEN_H
 199#include <libgen.h>
 200#else
 201#define basename gitbasename
 202extern char *gitbasename(char *);
 203#endif
 204
 205#ifndef NO_ICONV
 206#include <iconv.h>
 207#endif
 208
 209#ifndef NO_OPENSSL
 210#ifdef __APPLE__
 211#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 212#include <AvailabilityMacros.h>
 213#undef DEPRECATED_ATTRIBUTE
 214#define DEPRECATED_ATTRIBUTE
 215#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 216#endif
 217#include <openssl/ssl.h>
 218#include <openssl/err.h>
 219#ifdef NO_HMAC_CTX_CLEANUP
 220#define HMAC_CTX_cleanup HMAC_cleanup
 221#endif
 222#endif
 223
 224/* On most systems <netdb.h> would have given us this, but
 225 * not on some systems (e.g. z/OS).
 226 */
 227#ifndef NI_MAXHOST
 228#define NI_MAXHOST 1025
 229#endif
 230
 231#ifndef NI_MAXSERV
 232#define NI_MAXSERV 32
 233#endif
 234
 235/* On most systems <limits.h> would have given us this, but
 236 * not on some systems (e.g. GNU/Hurd).
 237 */
 238#ifndef PATH_MAX
 239#define PATH_MAX 4096
 240#endif
 241
 242#ifndef PRIuMAX
 243#define PRIuMAX "llu"
 244#endif
 245
 246#ifndef PRIu32
 247#define PRIu32 "u"
 248#endif
 249
 250#ifndef PRIx32
 251#define PRIx32 "x"
 252#endif
 253
 254#ifndef PRIo32
 255#define PRIo32 "o"
 256#endif
 257
 258#ifndef PATH_SEP
 259#define PATH_SEP ':'
 260#endif
 261
 262#ifdef HAVE_PATHS_H
 263#include <paths.h>
 264#endif
 265#ifndef _PATH_DEFPATH
 266#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 267#endif
 268
 269#ifndef STRIP_EXTENSION
 270#define STRIP_EXTENSION ""
 271#endif
 272
 273#ifndef has_dos_drive_prefix
 274static inline int git_has_dos_drive_prefix(const char *path)
 275{
 276        return 0;
 277}
 278#define has_dos_drive_prefix git_has_dos_drive_prefix
 279#endif
 280
 281#ifndef is_dir_sep
 282static inline int git_is_dir_sep(int c)
 283{
 284        return c == '/';
 285}
 286#define is_dir_sep git_is_dir_sep
 287#endif
 288
 289#ifndef offset_1st_component
 290static inline int git_offset_1st_component(const char *path)
 291{
 292        return is_dir_sep(path[0]);
 293}
 294#define offset_1st_component git_offset_1st_component
 295#endif
 296
 297#ifndef find_last_dir_sep
 298static inline char *git_find_last_dir_sep(const char *path)
 299{
 300        return strrchr(path, '/');
 301}
 302#define find_last_dir_sep git_find_last_dir_sep
 303#endif
 304
 305#if defined(__HP_cc) && (__HP_cc >= 61000)
 306#define NORETURN __attribute__((noreturn))
 307#define NORETURN_PTR
 308#elif defined(__GNUC__) && !defined(NO_NORETURN)
 309#define NORETURN __attribute__((__noreturn__))
 310#define NORETURN_PTR __attribute__((__noreturn__))
 311#elif defined(_MSC_VER)
 312#define NORETURN __declspec(noreturn)
 313#define NORETURN_PTR
 314#else
 315#define NORETURN
 316#define NORETURN_PTR
 317#ifndef __GNUC__
 318#ifndef __attribute__
 319#define __attribute__(x)
 320#endif
 321#endif
 322#endif
 323
 324/* The sentinel attribute is valid from gcc version 4.0 */
 325#if defined(__GNUC__) && (__GNUC__ >= 4)
 326#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 327#else
 328#define LAST_ARG_MUST_BE_NULL
 329#endif
 330
 331#include "compat/bswap.h"
 332
 333#include "wildmatch.h"
 334
 335struct strbuf;
 336
 337/* General helper functions */
 338extern void vreportf(const char *prefix, const char *err, va_list params);
 339extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 340extern NORETURN void usage(const char *err);
 341extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 342extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 343extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 344extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 345extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 346
 347#ifndef NO_OPENSSL
 348#ifdef APPLE_COMMON_CRYPTO
 349#include "compat/apple-common-crypto.h"
 350#else
 351#include <openssl/evp.h>
 352#include <openssl/hmac.h>
 353#endif /* APPLE_COMMON_CRYPTO */
 354#include <openssl/x509v3.h>
 355#endif /* NO_OPENSSL */
 356
 357/*
 358 * Let callers be aware of the constant return value; this can help
 359 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 360 * because some compilers may not support variadic macros. Since we're only
 361 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 362 * using the function as usual.
 363 */
 364#if defined(__GNUC__)
 365static inline int const_error(void)
 366{
 367        return -1;
 368}
 369#define error(...) (error(__VA_ARGS__), const_error())
 370#endif
 371
 372extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 373extern void set_error_routine(void (*routine)(const char *err, va_list params));
 374extern void set_die_is_recursing_routine(int (*routine)(void));
 375
 376extern int starts_with(const char *str, const char *prefix);
 377
 378/*
 379 * If the string "str" begins with the string found in "prefix", return 1.
 380 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 381 * the string right after the prefix).
 382 *
 383 * Otherwise, return 0 and leave "out" untouched.
 384 *
 385 * Examples:
 386 *
 387 *   [extract branch name, fail if not a branch]
 388 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 389 *      return -1;
 390 *
 391 *   [skip prefix if present, otherwise use whole string]
 392 *   skip_prefix(name, "refs/heads/", &name);
 393 */
 394static inline int skip_prefix(const char *str, const char *prefix,
 395                              const char **out)
 396{
 397        do {
 398                if (!*prefix) {
 399                        *out = str;
 400                        return 1;
 401                }
 402        } while (*str++ == *prefix++);
 403        return 0;
 404}
 405
 406/*
 407 * If buf ends with suffix, return 1 and subtract the length of the suffix
 408 * from *len. Otherwise, return 0 and leave *len untouched.
 409 */
 410static inline int strip_suffix_mem(const char *buf, size_t *len,
 411                                   const char *suffix)
 412{
 413        size_t suflen = strlen(suffix);
 414        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 415                return 0;
 416        *len -= suflen;
 417        return 1;
 418}
 419
 420/*
 421 * If str ends with suffix, return 1 and set *len to the size of the string
 422 * without the suffix. Otherwise, return 0 and set *len to the size of the
 423 * string.
 424 *
 425 * Note that we do _not_ NUL-terminate str to the new length.
 426 */
 427static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 428{
 429        *len = strlen(str);
 430        return strip_suffix_mem(str, len, suffix);
 431}
 432
 433static inline int ends_with(const char *str, const char *suffix)
 434{
 435        size_t len;
 436        return strip_suffix(str, suffix, &len);
 437}
 438
 439#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 440
 441#ifndef PROT_READ
 442#define PROT_READ 1
 443#define PROT_WRITE 2
 444#define MAP_PRIVATE 1
 445#endif
 446
 447#define mmap git_mmap
 448#define munmap git_munmap
 449extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 450extern int git_munmap(void *start, size_t length);
 451
 452#else /* NO_MMAP || USE_WIN32_MMAP */
 453
 454#include <sys/mman.h>
 455
 456#endif /* NO_MMAP || USE_WIN32_MMAP */
 457
 458#ifdef NO_MMAP
 459
 460/* This value must be multiple of (pagesize * 2) */
 461#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 462
 463#else /* NO_MMAP */
 464
 465/* This value must be multiple of (pagesize * 2) */
 466#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 467        (sizeof(void*) >= 8 \
 468                ?  1 * 1024 * 1024 * 1024 \
 469                : 32 * 1024 * 1024)
 470
 471#endif /* NO_MMAP */
 472
 473#ifndef MAP_FAILED
 474#define MAP_FAILED ((void *)-1)
 475#endif
 476
 477#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 478#define on_disk_bytes(st) ((st).st_size)
 479#else
 480#define on_disk_bytes(st) ((st).st_blocks * 512)
 481#endif
 482
 483#ifdef NEEDS_MODE_TRANSLATION
 484#undef S_IFMT
 485#undef S_IFREG
 486#undef S_IFDIR
 487#undef S_IFLNK
 488#undef S_IFBLK
 489#undef S_IFCHR
 490#undef S_IFIFO
 491#undef S_IFSOCK
 492#define S_IFMT   0170000
 493#define S_IFREG  0100000
 494#define S_IFDIR  0040000
 495#define S_IFLNK  0120000
 496#define S_IFBLK  0060000
 497#define S_IFCHR  0020000
 498#define S_IFIFO  0010000
 499#define S_IFSOCK 0140000
 500#ifdef stat
 501#undef stat
 502#endif
 503#define stat(path, buf) git_stat(path, buf)
 504extern int git_stat(const char *, struct stat *);
 505#ifdef fstat
 506#undef fstat
 507#endif
 508#define fstat(fd, buf) git_fstat(fd, buf)
 509extern int git_fstat(int, struct stat *);
 510#ifdef lstat
 511#undef lstat
 512#endif
 513#define lstat(path, buf) git_lstat(path, buf)
 514extern int git_lstat(const char *, struct stat *);
 515#endif
 516
 517#define DEFAULT_PACKED_GIT_LIMIT \
 518        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 519
 520#ifdef NO_PREAD
 521#define pread git_pread
 522extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 523#endif
 524/*
 525 * Forward decl that will remind us if its twin in cache.h changes.
 526 * This function is used in compat/pread.c.  But we can't include
 527 * cache.h there.
 528 */
 529extern ssize_t read_in_full(int fd, void *buf, size_t count);
 530
 531#ifdef NO_SETENV
 532#define setenv gitsetenv
 533extern int gitsetenv(const char *, const char *, int);
 534#endif
 535
 536#ifdef NO_MKDTEMP
 537#define mkdtemp gitmkdtemp
 538extern char *gitmkdtemp(char *);
 539#endif
 540
 541#ifdef NO_MKSTEMPS
 542#define mkstemps gitmkstemps
 543extern int gitmkstemps(char *, int);
 544#endif
 545
 546#ifdef NO_UNSETENV
 547#define unsetenv gitunsetenv
 548extern void gitunsetenv(const char *);
 549#endif
 550
 551#ifdef NO_STRCASESTR
 552#define strcasestr gitstrcasestr
 553extern char *gitstrcasestr(const char *haystack, const char *needle);
 554#endif
 555
 556#ifdef NO_STRLCPY
 557#define strlcpy gitstrlcpy
 558extern size_t gitstrlcpy(char *, const char *, size_t);
 559#endif
 560
 561#ifdef NO_STRTOUMAX
 562#define strtoumax gitstrtoumax
 563extern uintmax_t gitstrtoumax(const char *, char **, int);
 564#define strtoimax gitstrtoimax
 565extern intmax_t gitstrtoimax(const char *, char **, int);
 566#endif
 567
 568#ifdef NO_HSTRERROR
 569#define hstrerror githstrerror
 570extern const char *githstrerror(int herror);
 571#endif
 572
 573#ifdef NO_MEMMEM
 574#define memmem gitmemmem
 575void *gitmemmem(const void *haystack, size_t haystacklen,
 576                const void *needle, size_t needlelen);
 577#endif
 578
 579#ifdef NO_GETPAGESIZE
 580#define getpagesize() sysconf(_SC_PAGESIZE)
 581#endif
 582
 583#ifdef FREAD_READS_DIRECTORIES
 584#ifdef fopen
 585#undef fopen
 586#endif
 587#define fopen(a,b) git_fopen(a,b)
 588extern FILE *git_fopen(const char*, const char*);
 589#endif
 590
 591#ifdef SNPRINTF_RETURNS_BOGUS
 592#ifdef snprintf
 593#undef snprintf
 594#endif
 595#define snprintf git_snprintf
 596extern int git_snprintf(char *str, size_t maxsize,
 597                        const char *format, ...);
 598#ifdef vsnprintf
 599#undef vsnprintf
 600#endif
 601#define vsnprintf git_vsnprintf
 602extern int git_vsnprintf(char *str, size_t maxsize,
 603                         const char *format, va_list ap);
 604#endif
 605
 606#ifdef __GLIBC_PREREQ
 607#if __GLIBC_PREREQ(2, 1)
 608#define HAVE_STRCHRNUL
 609#define HAVE_MEMPCPY
 610#endif
 611#endif
 612
 613#ifndef HAVE_STRCHRNUL
 614#define strchrnul gitstrchrnul
 615static inline char *gitstrchrnul(const char *s, int c)
 616{
 617        while (*s && *s != c)
 618                s++;
 619        return (char *)s;
 620}
 621#endif
 622
 623#ifndef HAVE_MEMPCPY
 624#define mempcpy gitmempcpy
 625static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 626{
 627        return (char *)memcpy(dest, src, n) + n;
 628}
 629#endif
 630
 631#ifdef NO_INET_PTON
 632int inet_pton(int af, const char *src, void *dst);
 633#endif
 634
 635#ifdef NO_INET_NTOP
 636const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 637#endif
 638
 639#ifdef NO_PTHREADS
 640#define atexit git_atexit
 641extern int git_atexit(void (*handler)(void));
 642#endif
 643
 644extern void release_pack_memory(size_t);
 645
 646typedef void (*try_to_free_t)(size_t);
 647extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 648
 649#ifdef HAVE_ALLOCA_H
 650# include <alloca.h>
 651# define xalloca(size)      (alloca(size))
 652# define xalloca_free(p)    do {} while (0)
 653#else
 654# define xalloca(size)      (xmalloc(size))
 655# define xalloca_free(p)    (free(p))
 656#endif
 657extern char *xstrdup(const char *str);
 658extern void *xmalloc(size_t size);
 659extern void *xmallocz(size_t size);
 660extern void *xmallocz_gently(size_t size);
 661extern void *xmemdupz(const void *data, size_t len);
 662extern char *xstrndup(const char *str, size_t len);
 663extern void *xrealloc(void *ptr, size_t size);
 664extern void *xcalloc(size_t nmemb, size_t size);
 665extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 666extern ssize_t xread(int fd, void *buf, size_t len);
 667extern ssize_t xwrite(int fd, const void *buf, size_t len);
 668extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 669extern int xdup(int fd);
 670extern FILE *xfdopen(int fd, const char *mode);
 671extern int xmkstemp(char *template);
 672extern int xmkstemp_mode(char *template, int mode);
 673extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 674extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 675extern char *xgetcwd(void);
 676
 677#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 678
 679static inline char *xstrdup_or_null(const char *str)
 680{
 681        return str ? xstrdup(str) : NULL;
 682}
 683
 684static inline size_t xsize_t(off_t len)
 685{
 686        if (len > (size_t) len)
 687                die("Cannot handle files this big");
 688        return (size_t)len;
 689}
 690
 691/* in ctype.c, for kwset users */
 692extern const unsigned char tolower_trans_tbl[256];
 693
 694/* Sane ctype - no locale, and works with signed chars */
 695#undef isascii
 696#undef isspace
 697#undef isdigit
 698#undef isalpha
 699#undef isalnum
 700#undef isprint
 701#undef islower
 702#undef isupper
 703#undef tolower
 704#undef toupper
 705#undef iscntrl
 706#undef ispunct
 707#undef isxdigit
 708
 709extern const unsigned char sane_ctype[256];
 710#define GIT_SPACE 0x01
 711#define GIT_DIGIT 0x02
 712#define GIT_ALPHA 0x04
 713#define GIT_GLOB_SPECIAL 0x08
 714#define GIT_REGEX_SPECIAL 0x10
 715#define GIT_PATHSPEC_MAGIC 0x20
 716#define GIT_CNTRL 0x40
 717#define GIT_PUNCT 0x80
 718#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 719#define isascii(x) (((x) & ~0x7f) == 0)
 720#define isspace(x) sane_istest(x,GIT_SPACE)
 721#define isdigit(x) sane_istest(x,GIT_DIGIT)
 722#define isalpha(x) sane_istest(x,GIT_ALPHA)
 723#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 724#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 725#define islower(x) sane_iscase(x, 1)
 726#define isupper(x) sane_iscase(x, 0)
 727#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 728#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 729#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 730#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 731                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 732#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 733#define tolower(x) sane_case((unsigned char)(x), 0x20)
 734#define toupper(x) sane_case((unsigned char)(x), 0)
 735#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 736
 737static inline int sane_case(int x, int high)
 738{
 739        if (sane_istest(x, GIT_ALPHA))
 740                x = (x & ~0x20) | high;
 741        return x;
 742}
 743
 744static inline int sane_iscase(int x, int is_lower)
 745{
 746        if (!sane_istest(x, GIT_ALPHA))
 747                return 0;
 748
 749        if (is_lower)
 750                return (x & 0x20) != 0;
 751        else
 752                return (x & 0x20) == 0;
 753}
 754
 755static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 756{
 757        unsigned long ul;
 758        char *p;
 759
 760        errno = 0;
 761        ul = strtoul(s, &p, base);
 762        if (errno || *p || p == s || (unsigned int) ul != ul)
 763                return -1;
 764        *result = ul;
 765        return 0;
 766}
 767
 768static inline int strtol_i(char const *s, int base, int *result)
 769{
 770        long ul;
 771        char *p;
 772
 773        errno = 0;
 774        ul = strtol(s, &p, base);
 775        if (errno || *p || p == s || (int) ul != ul)
 776                return -1;
 777        *result = ul;
 778        return 0;
 779}
 780
 781#ifdef INTERNAL_QSORT
 782void git_qsort(void *base, size_t nmemb, size_t size,
 783               int(*compar)(const void *, const void *));
 784#define qsort git_qsort
 785#endif
 786
 787#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 788# define FORCE_DIR_SET_GID S_ISGID
 789#else
 790# define FORCE_DIR_SET_GID 0
 791#endif
 792
 793#ifdef NO_NSEC
 794#undef USE_NSEC
 795#define ST_CTIME_NSEC(st) 0
 796#define ST_MTIME_NSEC(st) 0
 797#else
 798#ifdef USE_ST_TIMESPEC
 799#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 800#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 801#else
 802#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 803#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 804#endif
 805#endif
 806
 807#ifdef UNRELIABLE_FSTAT
 808#define fstat_is_reliable() 0
 809#else
 810#define fstat_is_reliable() 1
 811#endif
 812
 813#ifndef va_copy
 814/*
 815 * Since an obvious implementation of va_list would be to make it a
 816 * pointer into the stack frame, a simple assignment will work on
 817 * many systems.  But let's try to be more portable.
 818 */
 819#ifdef __va_copy
 820#define va_copy(dst, src) __va_copy(dst, src)
 821#else
 822#define va_copy(dst, src) ((dst) = (src))
 823#endif
 824#endif
 825
 826#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 827#define HAVE_VARIADIC_MACROS 1
 828#endif
 829
 830/*
 831 * Preserves errno, prints a message, but gives no warning for ENOENT.
 832 * Returns 0 on success, which includes trying to unlink an object that does
 833 * not exist.
 834 */
 835int unlink_or_warn(const char *path);
 836 /*
 837  * Tries to unlink file.  Returns 0 if unlink succeeded
 838  * or the file already didn't exist.  Returns -1 and
 839  * appends a message to err suitable for
 840  * 'error("%s", err->buf)' on error.
 841  */
 842int unlink_or_msg(const char *file, struct strbuf *err);
 843/*
 844 * Preserves errno, prints a message, but gives no warning for ENOENT.
 845 * Returns 0 on success, which includes trying to remove a directory that does
 846 * not exist.
 847 */
 848int rmdir_or_warn(const char *path);
 849/*
 850 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 851 * the supplied file mode.
 852 */
 853int remove_or_warn(unsigned int mode, const char *path);
 854
 855/*
 856 * Call access(2), but warn for any error except "missing file"
 857 * (ENOENT or ENOTDIR).
 858 */
 859#define ACCESS_EACCES_OK (1U << 0)
 860int access_or_warn(const char *path, int mode, unsigned flag);
 861int access_or_die(const char *path, int mode, unsigned flag);
 862
 863/* Warn on an inaccessible file that ought to be accessible */
 864void warn_on_inaccessible(const char *path);
 865
 866/* Get the passwd entry for the UID of the current process. */
 867struct passwd *xgetpwuid_self(void);
 868
 869#ifdef GMTIME_UNRELIABLE_ERRORS
 870struct tm *git_gmtime(const time_t *);
 871struct tm *git_gmtime_r(const time_t *, struct tm *);
 872#define gmtime git_gmtime
 873#define gmtime_r git_gmtime_r
 874#endif
 875
 876#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 877#define USE_PARENS_AROUND_GETTEXT_N 1
 878#endif
 879
 880#endif