Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Merge branch 'jc/send-email-sensible-encoding' (33a2eea)
   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/wait.h>
 138#include <sys/resource.h>
 139#include <sys/socket.h>
 140#include <sys/ioctl.h>
 141#include <termios.h>
 142#ifndef NO_SYS_SELECT_H
 143#include <sys/select.h>
 144#endif
 145#include <netinet/in.h>
 146#include <netinet/tcp.h>
 147#include <arpa/inet.h>
 148#include <netdb.h>
 149#include <pwd.h>
 150#include <sys/un.h>
 151#ifndef NO_INTTYPES_H
 152#include <inttypes.h>
 153#else
 154#include <stdint.h>
 155#endif
 156#ifdef NO_INTPTR_T
 157/*
 158 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 159 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 160 * while on IP16 and IP16L32 it is "int" (resp. "short")
 161 * Size needs to match (or exceed) 'sizeof(void *)'.
 162 * We can't take "long long" here as not everybody has it.
 163 */
 164typedef long intptr_t;
 165typedef unsigned long uintptr_t;
 166#endif
 167#if defined(__CYGWIN__)
 168#undef _XOPEN_SOURCE
 169#include <grp.h>
 170#define _XOPEN_SOURCE 600
 171#else
 172#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 173#include <grp.h>
 174#define _ALL_SOURCE 1
 175#endif
 176#endif
 177
 178/* used on Mac OS X */
 179#ifdef PRECOMPOSE_UNICODE
 180#include "compat/precompose_utf8.h"
 181#else
 182#define precompose_str(in,i_nfd2nfc)
 183#define precompose_argv(c,v)
 184#define probe_utf8_pathname_composition(a,b)
 185#endif
 186
 187#ifdef MKDIR_WO_TRAILING_SLASH
 188#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 189extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 190#endif
 191
 192#ifdef NO_STRUCT_ITIMERVAL
 193struct itimerval {
 194        struct timeval it_interval;
 195        struct timeval it_value;
 196};
 197#endif
 198
 199#ifdef NO_SETITIMER
 200#define setitimer(which,value,ovalue)
 201#endif
 202
 203#ifndef NO_LIBGEN_H
 204#include <libgen.h>
 205#else
 206#define basename gitbasename
 207extern char *gitbasename(char *);
 208#endif
 209
 210#ifndef NO_ICONV
 211#include <iconv.h>
 212#endif
 213
 214#ifndef NO_OPENSSL
 215#ifdef __APPLE__
 216#define __AVAILABILITY_MACROS_USES_AVAILABILITY 0
 217#include <AvailabilityMacros.h>
 218#undef DEPRECATED_ATTRIBUTE
 219#define DEPRECATED_ATTRIBUTE
 220#undef __AVAILABILITY_MACROS_USES_AVAILABILITY
 221#endif
 222#include <openssl/ssl.h>
 223#include <openssl/err.h>
 224#ifdef NO_HMAC_CTX_CLEANUP
 225#define HMAC_CTX_cleanup HMAC_cleanup
 226#endif
 227#endif
 228
 229/* On most systems <netdb.h> would have given us this, but
 230 * not on some systems (e.g. z/OS).
 231 */
 232#ifndef NI_MAXHOST
 233#define NI_MAXHOST 1025
 234#endif
 235
 236#ifndef NI_MAXSERV
 237#define NI_MAXSERV 32
 238#endif
 239
 240/* On most systems <limits.h> would have given us this, but
 241 * not on some systems (e.g. GNU/Hurd).
 242 */
 243#ifndef PATH_MAX
 244#define PATH_MAX 4096
 245#endif
 246
 247#ifndef PRIuMAX
 248#define PRIuMAX "llu"
 249#endif
 250
 251#ifndef PRIu32
 252#define PRIu32 "u"
 253#endif
 254
 255#ifndef PRIx32
 256#define PRIx32 "x"
 257#endif
 258
 259#ifndef PRIo32
 260#define PRIo32 "o"
 261#endif
 262
 263#ifndef PATH_SEP
 264#define PATH_SEP ':'
 265#endif
 266
 267#ifdef HAVE_PATHS_H
 268#include <paths.h>
 269#endif
 270#ifndef _PATH_DEFPATH
 271#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 272#endif
 273
 274#ifndef STRIP_EXTENSION
 275#define STRIP_EXTENSION ""
 276#endif
 277
 278#ifndef has_dos_drive_prefix
 279static inline int git_has_dos_drive_prefix(const char *path)
 280{
 281        return 0;
 282}
 283#define has_dos_drive_prefix git_has_dos_drive_prefix
 284#endif
 285
 286#ifndef is_dir_sep
 287static inline int git_is_dir_sep(int c)
 288{
 289        return c == '/';
 290}
 291#define is_dir_sep git_is_dir_sep
 292#endif
 293
 294#ifndef offset_1st_component
 295static inline int git_offset_1st_component(const char *path)
 296{
 297        return is_dir_sep(path[0]);
 298}
 299#define offset_1st_component git_offset_1st_component
 300#endif
 301
 302#ifndef find_last_dir_sep
 303static inline char *git_find_last_dir_sep(const char *path)
 304{
 305        return strrchr(path, '/');
 306}
 307#define find_last_dir_sep git_find_last_dir_sep
 308#endif
 309
 310#if defined(__HP_cc) && (__HP_cc >= 61000)
 311#define NORETURN __attribute__((noreturn))
 312#define NORETURN_PTR
 313#elif defined(__GNUC__) && !defined(NO_NORETURN)
 314#define NORETURN __attribute__((__noreturn__))
 315#define NORETURN_PTR __attribute__((__noreturn__))
 316#elif defined(_MSC_VER)
 317#define NORETURN __declspec(noreturn)
 318#define NORETURN_PTR
 319#else
 320#define NORETURN
 321#define NORETURN_PTR
 322#ifndef __GNUC__
 323#ifndef __attribute__
 324#define __attribute__(x)
 325#endif
 326#endif
 327#endif
 328
 329/* The sentinel attribute is valid from gcc version 4.0 */
 330#if defined(__GNUC__) && (__GNUC__ >= 4)
 331#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 332#else
 333#define LAST_ARG_MUST_BE_NULL
 334#endif
 335
 336#include "compat/bswap.h"
 337
 338#include "wildmatch.h"
 339
 340struct strbuf;
 341
 342/* General helper functions */
 343extern void vreportf(const char *prefix, const char *err, va_list params);
 344extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 345extern NORETURN void usage(const char *err);
 346extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 347extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 348extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 349extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 350extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 351
 352#ifndef NO_OPENSSL
 353#ifdef APPLE_COMMON_CRYPTO
 354#include "compat/apple-common-crypto.h"
 355#else
 356#include <openssl/evp.h>
 357#include <openssl/hmac.h>
 358#endif /* APPLE_COMMON_CRYPTO */
 359#include <openssl/x509v3.h>
 360#endif /* NO_OPENSSL */
 361
 362/*
 363 * Let callers be aware of the constant return value; this can help
 364 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 365 * because some compilers may not support variadic macros. Since we're only
 366 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 367 * using the function as usual.
 368 */
 369#if defined(__GNUC__)
 370static inline int const_error(void)
 371{
 372        return -1;
 373}
 374#define error(...) (error(__VA_ARGS__), const_error())
 375#endif
 376
 377extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 378extern void set_error_routine(void (*routine)(const char *err, va_list params));
 379extern void set_die_is_recursing_routine(int (*routine)(void));
 380
 381extern int starts_with(const char *str, const char *prefix);
 382
 383/*
 384 * If the string "str" begins with the string found in "prefix", return 1.
 385 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 386 * the string right after the prefix).
 387 *
 388 * Otherwise, return 0 and leave "out" untouched.
 389 *
 390 * Examples:
 391 *
 392 *   [extract branch name, fail if not a branch]
 393 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 394 *      return -1;
 395 *
 396 *   [skip prefix if present, otherwise use whole string]
 397 *   skip_prefix(name, "refs/heads/", &name);
 398 */
 399static inline int skip_prefix(const char *str, const char *prefix,
 400                              const char **out)
 401{
 402        do {
 403                if (!*prefix) {
 404                        *out = str;
 405                        return 1;
 406                }
 407        } while (*str++ == *prefix++);
 408        return 0;
 409}
 410
 411/*
 412 * If buf ends with suffix, return 1 and subtract the length of the suffix
 413 * from *len. Otherwise, return 0 and leave *len untouched.
 414 */
 415static inline int strip_suffix_mem(const char *buf, size_t *len,
 416                                   const char *suffix)
 417{
 418        size_t suflen = strlen(suffix);
 419        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 420                return 0;
 421        *len -= suflen;
 422        return 1;
 423}
 424
 425/*
 426 * If str ends with suffix, return 1 and set *len to the size of the string
 427 * without the suffix. Otherwise, return 0 and set *len to the size of the
 428 * string.
 429 *
 430 * Note that we do _not_ NUL-terminate str to the new length.
 431 */
 432static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 433{
 434        *len = strlen(str);
 435        return strip_suffix_mem(str, len, suffix);
 436}
 437
 438static inline int ends_with(const char *str, const char *suffix)
 439{
 440        size_t len;
 441        return strip_suffix(str, suffix, &len);
 442}
 443
 444#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 445
 446#ifndef PROT_READ
 447#define PROT_READ 1
 448#define PROT_WRITE 2
 449#define MAP_PRIVATE 1
 450#endif
 451
 452#define mmap git_mmap
 453#define munmap git_munmap
 454extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 455extern int git_munmap(void *start, size_t length);
 456
 457#else /* NO_MMAP || USE_WIN32_MMAP */
 458
 459#include <sys/mman.h>
 460
 461#endif /* NO_MMAP || USE_WIN32_MMAP */
 462
 463#ifdef NO_MMAP
 464
 465/* This value must be multiple of (pagesize * 2) */
 466#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 467
 468#else /* NO_MMAP */
 469
 470/* This value must be multiple of (pagesize * 2) */
 471#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 472        (sizeof(void*) >= 8 \
 473                ?  1 * 1024 * 1024 * 1024 \
 474                : 32 * 1024 * 1024)
 475
 476#endif /* NO_MMAP */
 477
 478#ifndef MAP_FAILED
 479#define MAP_FAILED ((void *)-1)
 480#endif
 481
 482#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 483#define on_disk_bytes(st) ((st).st_size)
 484#else
 485#define on_disk_bytes(st) ((st).st_blocks * 512)
 486#endif
 487
 488#ifdef NEEDS_MODE_TRANSLATION
 489#undef S_IFMT
 490#undef S_IFREG
 491#undef S_IFDIR
 492#undef S_IFLNK
 493#undef S_IFBLK
 494#undef S_IFCHR
 495#undef S_IFIFO
 496#undef S_IFSOCK
 497#define S_IFMT   0170000
 498#define S_IFREG  0100000
 499#define S_IFDIR  0040000
 500#define S_IFLNK  0120000
 501#define S_IFBLK  0060000
 502#define S_IFCHR  0020000
 503#define S_IFIFO  0010000
 504#define S_IFSOCK 0140000
 505#ifdef stat
 506#undef stat
 507#endif
 508#define stat(path, buf) git_stat(path, buf)
 509extern int git_stat(const char *, struct stat *);
 510#ifdef fstat
 511#undef fstat
 512#endif
 513#define fstat(fd, buf) git_fstat(fd, buf)
 514extern int git_fstat(int, struct stat *);
 515#ifdef lstat
 516#undef lstat
 517#endif
 518#define lstat(path, buf) git_lstat(path, buf)
 519extern int git_lstat(const char *, struct stat *);
 520#endif
 521
 522#define DEFAULT_PACKED_GIT_LIMIT \
 523        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 524
 525#ifdef NO_PREAD
 526#define pread git_pread
 527extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 528#endif
 529/*
 530 * Forward decl that will remind us if its twin in cache.h changes.
 531 * This function is used in compat/pread.c.  But we can't include
 532 * cache.h there.
 533 */
 534extern ssize_t read_in_full(int fd, void *buf, size_t count);
 535
 536#ifdef NO_SETENV
 537#define setenv gitsetenv
 538extern int gitsetenv(const char *, const char *, int);
 539#endif
 540
 541#ifdef NO_MKDTEMP
 542#define mkdtemp gitmkdtemp
 543extern char *gitmkdtemp(char *);
 544#endif
 545
 546#ifdef NO_MKSTEMPS
 547#define mkstemps gitmkstemps
 548extern int gitmkstemps(char *, int);
 549#endif
 550
 551#ifdef NO_UNSETENV
 552#define unsetenv gitunsetenv
 553extern void gitunsetenv(const char *);
 554#endif
 555
 556#ifdef NO_STRCASESTR
 557#define strcasestr gitstrcasestr
 558extern char *gitstrcasestr(const char *haystack, const char *needle);
 559#endif
 560
 561#ifdef NO_STRLCPY
 562#define strlcpy gitstrlcpy
 563extern size_t gitstrlcpy(char *, const char *, size_t);
 564#endif
 565
 566#ifdef NO_STRTOUMAX
 567#define strtoumax gitstrtoumax
 568extern uintmax_t gitstrtoumax(const char *, char **, int);
 569#define strtoimax gitstrtoimax
 570extern intmax_t gitstrtoimax(const char *, char **, int);
 571#endif
 572
 573#ifdef NO_HSTRERROR
 574#define hstrerror githstrerror
 575extern const char *githstrerror(int herror);
 576#endif
 577
 578#ifdef NO_MEMMEM
 579#define memmem gitmemmem
 580void *gitmemmem(const void *haystack, size_t haystacklen,
 581                const void *needle, size_t needlelen);
 582#endif
 583
 584#ifdef NO_GETPAGESIZE
 585#define getpagesize() sysconf(_SC_PAGESIZE)
 586#endif
 587
 588#ifdef FREAD_READS_DIRECTORIES
 589#ifdef fopen
 590#undef fopen
 591#endif
 592#define fopen(a,b) git_fopen(a,b)
 593extern FILE *git_fopen(const char*, const char*);
 594#endif
 595
 596#ifdef SNPRINTF_RETURNS_BOGUS
 597#ifdef snprintf
 598#undef snprintf
 599#endif
 600#define snprintf git_snprintf
 601extern int git_snprintf(char *str, size_t maxsize,
 602                        const char *format, ...);
 603#ifdef vsnprintf
 604#undef vsnprintf
 605#endif
 606#define vsnprintf git_vsnprintf
 607extern int git_vsnprintf(char *str, size_t maxsize,
 608                         const char *format, va_list ap);
 609#endif
 610
 611#ifdef __GLIBC_PREREQ
 612#if __GLIBC_PREREQ(2, 1)
 613#define HAVE_STRCHRNUL
 614#define HAVE_MEMPCPY
 615#endif
 616#endif
 617
 618#ifndef HAVE_STRCHRNUL
 619#define strchrnul gitstrchrnul
 620static inline char *gitstrchrnul(const char *s, int c)
 621{
 622        while (*s && *s != c)
 623                s++;
 624        return (char *)s;
 625}
 626#endif
 627
 628#ifndef HAVE_MEMPCPY
 629#define mempcpy gitmempcpy
 630static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 631{
 632        return (char *)memcpy(dest, src, n) + n;
 633}
 634#endif
 635
 636#ifdef NO_INET_PTON
 637int inet_pton(int af, const char *src, void *dst);
 638#endif
 639
 640#ifdef NO_INET_NTOP
 641const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 642#endif
 643
 644#ifdef NO_PTHREADS
 645#define atexit git_atexit
 646extern int git_atexit(void (*handler)(void));
 647#endif
 648
 649extern void release_pack_memory(size_t);
 650
 651typedef void (*try_to_free_t)(size_t);
 652extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 653
 654#ifdef HAVE_ALLOCA_H
 655# include <alloca.h>
 656# define xalloca(size)      (alloca(size))
 657# define xalloca_free(p)    do {} while (0)
 658#else
 659# define xalloca(size)      (xmalloc(size))
 660# define xalloca_free(p)    (free(p))
 661#endif
 662extern char *xstrdup(const char *str);
 663extern void *xmalloc(size_t size);
 664extern void *xmallocz(size_t size);
 665extern void *xmallocz_gently(size_t size);
 666extern void *xmemdupz(const void *data, size_t len);
 667extern char *xstrndup(const char *str, size_t len);
 668extern void *xrealloc(void *ptr, size_t size);
 669extern void *xcalloc(size_t nmemb, size_t size);
 670extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 671extern ssize_t xread(int fd, void *buf, size_t len);
 672extern ssize_t xwrite(int fd, const void *buf, size_t len);
 673extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 674extern int xdup(int fd);
 675extern FILE *xfdopen(int fd, const char *mode);
 676extern int xmkstemp(char *template);
 677extern int xmkstemp_mode(char *template, int mode);
 678extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 679extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 680extern char *xgetcwd(void);
 681
 682#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 683
 684static inline char *xstrdup_or_null(const char *str)
 685{
 686        return str ? xstrdup(str) : NULL;
 687}
 688
 689static inline size_t xsize_t(off_t len)
 690{
 691        if (len > (size_t) len)
 692                die("Cannot handle files this big");
 693        return (size_t)len;
 694}
 695
 696/* in ctype.c, for kwset users */
 697extern const char tolower_trans_tbl[256];
 698
 699/* Sane ctype - no locale, and works with signed chars */
 700#undef isascii
 701#undef isspace
 702#undef isdigit
 703#undef isalpha
 704#undef isalnum
 705#undef isprint
 706#undef islower
 707#undef isupper
 708#undef tolower
 709#undef toupper
 710#undef iscntrl
 711#undef ispunct
 712#undef isxdigit
 713
 714extern const unsigned char sane_ctype[256];
 715#define GIT_SPACE 0x01
 716#define GIT_DIGIT 0x02
 717#define GIT_ALPHA 0x04
 718#define GIT_GLOB_SPECIAL 0x08
 719#define GIT_REGEX_SPECIAL 0x10
 720#define GIT_PATHSPEC_MAGIC 0x20
 721#define GIT_CNTRL 0x40
 722#define GIT_PUNCT 0x80
 723#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 724#define isascii(x) (((x) & ~0x7f) == 0)
 725#define isspace(x) sane_istest(x,GIT_SPACE)
 726#define isdigit(x) sane_istest(x,GIT_DIGIT)
 727#define isalpha(x) sane_istest(x,GIT_ALPHA)
 728#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 729#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 730#define islower(x) sane_iscase(x, 1)
 731#define isupper(x) sane_iscase(x, 0)
 732#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 733#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 734#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 735#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 736                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 737#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 738#define tolower(x) sane_case((unsigned char)(x), 0x20)
 739#define toupper(x) sane_case((unsigned char)(x), 0)
 740#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 741
 742static inline int sane_case(int x, int high)
 743{
 744        if (sane_istest(x, GIT_ALPHA))
 745                x = (x & ~0x20) | high;
 746        return x;
 747}
 748
 749static inline int sane_iscase(int x, int is_lower)
 750{
 751        if (!sane_istest(x, GIT_ALPHA))
 752                return 0;
 753
 754        if (is_lower)
 755                return (x & 0x20) != 0;
 756        else
 757                return (x & 0x20) == 0;
 758}
 759
 760static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 761{
 762        unsigned long ul;
 763        char *p;
 764
 765        errno = 0;
 766        ul = strtoul(s, &p, base);
 767        if (errno || *p || p == s || (unsigned int) ul != ul)
 768                return -1;
 769        *result = ul;
 770        return 0;
 771}
 772
 773static inline int strtol_i(char const *s, int base, int *result)
 774{
 775        long ul;
 776        char *p;
 777
 778        errno = 0;
 779        ul = strtol(s, &p, base);
 780        if (errno || *p || p == s || (int) ul != ul)
 781                return -1;
 782        *result = ul;
 783        return 0;
 784}
 785
 786#ifdef INTERNAL_QSORT
 787void git_qsort(void *base, size_t nmemb, size_t size,
 788               int(*compar)(const void *, const void *));
 789#define qsort git_qsort
 790#endif
 791
 792#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 793# define FORCE_DIR_SET_GID S_ISGID
 794#else
 795# define FORCE_DIR_SET_GID 0
 796#endif
 797
 798#ifdef NO_NSEC
 799#undef USE_NSEC
 800#define ST_CTIME_NSEC(st) 0
 801#define ST_MTIME_NSEC(st) 0
 802#else
 803#ifdef USE_ST_TIMESPEC
 804#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 805#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 806#else
 807#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 808#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 809#endif
 810#endif
 811
 812#ifdef UNRELIABLE_FSTAT
 813#define fstat_is_reliable() 0
 814#else
 815#define fstat_is_reliable() 1
 816#endif
 817
 818#ifndef va_copy
 819/*
 820 * Since an obvious implementation of va_list would be to make it a
 821 * pointer into the stack frame, a simple assignment will work on
 822 * many systems.  But let's try to be more portable.
 823 */
 824#ifdef __va_copy
 825#define va_copy(dst, src) __va_copy(dst, src)
 826#else
 827#define va_copy(dst, src) ((dst) = (src))
 828#endif
 829#endif
 830
 831#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 832#define HAVE_VARIADIC_MACROS 1
 833#endif
 834
 835/*
 836 * Preserves errno, prints a message, but gives no warning for ENOENT.
 837 * Returns 0 on success, which includes trying to unlink an object that does
 838 * not exist.
 839 */
 840int unlink_or_warn(const char *path);
 841 /*
 842  * Tries to unlink file.  Returns 0 if unlink succeeded
 843  * or the file already didn't exist.  Returns -1 and
 844  * appends a message to err suitable for
 845  * 'error("%s", err->buf)' on error.
 846  */
 847int unlink_or_msg(const char *file, struct strbuf *err);
 848/*
 849 * Preserves errno, prints a message, but gives no warning for ENOENT.
 850 * Returns 0 on success, which includes trying to remove a directory that does
 851 * not exist.
 852 */
 853int rmdir_or_warn(const char *path);
 854/*
 855 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 856 * the supplied file mode.
 857 */
 858int remove_or_warn(unsigned int mode, const char *path);
 859
 860/*
 861 * Call access(2), but warn for any error except "missing file"
 862 * (ENOENT or ENOTDIR).
 863 */
 864#define ACCESS_EACCES_OK (1U << 0)
 865int access_or_warn(const char *path, int mode, unsigned flag);
 866int access_or_die(const char *path, int mode, unsigned flag);
 867
 868/* Warn on an inaccessible file that ought to be accessible */
 869void warn_on_inaccessible(const char *path);
 870
 871/* Get the passwd entry for the UID of the current process. */
 872struct passwd *xgetpwuid_self(void);
 873
 874#ifdef GMTIME_UNRELIABLE_ERRORS
 875struct tm *git_gmtime(const time_t *);
 876struct tm *git_gmtime_r(const time_t *, struct tm *);
 877#define gmtime git_gmtime
 878#define gmtime_r git_gmtime_r
 879#endif
 880
 881#if !defined(USE_PARENS_AROUND_GETTEXT_N) && defined(__GNUC__)
 882#define USE_PARENS_AROUND_GETTEXT_N 1
 883#endif
 884
 885#endif