Andrew's git - gitweb.git/blob

   1#ifndef GIT_COMPAT_UTIL_H
   2#define GIT_COMPAT_UTIL_H
   3
   4#define _FILE_OFFSET_BITS 64
   5
   6#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 _NETBSD_SOURCE 1
  87#define _SGI_SOURCE 1
  88
  89#if defined(WIN32) && !defined(__CYGWIN__) /* Both MinGW and MSVC */
  90# if defined (_MSC_VER) && !defined(_WIN32_WINNT)
  91#  define _WIN32_WINNT 0x0502
  92# endif
  93#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  94#include <winsock2.h>
  95#include <windows.h>
  96#define GIT_WINDOWS_NATIVE
  97#endif
  98
  99#include <unistd.h>
 100#include <stdio.h>
 101#include <sys/stat.h>
 102#include <fcntl.h>
 103#include <stddef.h>
 104#include <stdlib.h>
 105#include <stdarg.h>
 106#include <string.h>
 107#ifdef HAVE_STRINGS_H
 108#include <strings.h> /* for strcasecmp() */
 109#endif
 110#include <errno.h>
 111#include <limits.h>
 112#ifdef NEEDS_SYS_PARAM_H
 113#include <sys/param.h>
 114#endif
 115#include <sys/types.h>
 116#include <dirent.h>
 117#include <sys/time.h>
 118#include <time.h>
 119#include <signal.h>
 120#include <assert.h>
 121#include <regex.h>
 122#include <utime.h>
 123#include <syslog.h>
 124#ifndef NO_SYS_POLL_H
 125#include <sys/poll.h>
 126#else
 127#include <poll.h>
 128#endif
 129
 130#if defined(__MINGW32__)
 131/* pull in Windows compatibility stuff */
 132#include "compat/mingw.h"
 133#elif defined(_MSC_VER)
 134#include "compat/msvc.h"
 135#else
 136#include <sys/wait.h>
 137#include <sys/resource.h>
 138#include <sys/socket.h>
 139#include <sys/ioctl.h>
 140#include <termios.h>
 141#ifndef NO_SYS_SELECT_H
 142#include <sys/select.h>
 143#endif
 144#include <netinet/in.h>
 145#include <netinet/tcp.h>
 146#include <arpa/inet.h>
 147#include <netdb.h>
 148#include <pwd.h>
 149#include <sys/un.h>
 150#ifndef NO_INTTYPES_H
 151#include <inttypes.h>
 152#else
 153#include <stdint.h>
 154#endif
 155#ifdef NO_INTPTR_T
 156/*
 157 * On I16LP32, ILP32 and LP64 "long" is the save bet, however
 158 * on LLP86, IL33LLP64 and P64 it needs to be "long long",
 159 * while on IP16 and IP16L32 it is "int" (resp. "short")
 160 * Size needs to match (or exceed) 'sizeof(void *)'.
 161 * We can't take "long long" here as not everybody has it.
 162 */
 163typedef long intptr_t;
 164typedef unsigned long uintptr_t;
 165#endif
 166#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 167#include <grp.h>
 168#define _ALL_SOURCE 1
 169#endif
 170
 171/* used on Mac OS X */
 172#ifdef PRECOMPOSE_UNICODE
 173#include "compat/precompose_utf8.h"
 174#else
 175#define precompose_str(in,i_nfd2nfc)
 176#define precompose_argv(c,v)
 177#define probe_utf8_pathname_composition(a,b)
 178#endif
 179
 180#ifdef MKDIR_WO_TRAILING_SLASH
 181#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 182extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 183#endif
 184
 185#ifdef NO_STRUCT_ITIMERVAL
 186struct itimerval {
 187        struct timeval it_interval;
 188        struct timeval it_value;
 189}
 190#endif
 191
 192#ifdef NO_SETITIMER
 193#define setitimer(which,value,ovalue)
 194#endif
 195
 196#ifndef NO_LIBGEN_H
 197#include <libgen.h>
 198#else
 199#define basename gitbasename
 200extern char *gitbasename(char *);
 201#endif
 202
 203#ifndef NO_ICONV
 204#include <iconv.h>
 205#endif
 206
 207#ifndef NO_OPENSSL
 208#include <openssl/ssl.h>
 209#include <openssl/err.h>
 210#endif
 211
 212/* On most systems <netdb.h> would have given us this, but
 213 * not on some systems (e.g. z/OS).
 214 */
 215#ifndef NI_MAXHOST
 216#define NI_MAXHOST 1025
 217#endif
 218
 219#ifndef NI_MAXSERV
 220#define NI_MAXSERV 32
 221#endif
 222
 223/* On most systems <limits.h> would have given us this, but
 224 * not on some systems (e.g. GNU/Hurd).
 225 */
 226#ifndef PATH_MAX
 227#define PATH_MAX 4096
 228#endif
 229
 230#ifndef PRIuMAX
 231#define PRIuMAX "llu"
 232#endif
 233
 234#ifndef PRIu32
 235#define PRIu32 "u"
 236#endif
 237
 238#ifndef PRIx32
 239#define PRIx32 "x"
 240#endif
 241
 242#ifndef PRIo32
 243#define PRIo32 "o"
 244#endif
 245
 246#ifndef PATH_SEP
 247#define PATH_SEP ':'
 248#endif
 249
 250#ifdef HAVE_PATHS_H
 251#include <paths.h>
 252#endif
 253#ifndef _PATH_DEFPATH
 254#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 255#endif
 256
 257#ifndef STRIP_EXTENSION
 258#define STRIP_EXTENSION ""
 259#endif
 260
 261#ifndef has_dos_drive_prefix
 262#define has_dos_drive_prefix(path) 0
 263#endif
 264
 265#ifndef offset_1st_component
 266#define offset_1st_component(path) (is_dir_sep((path)[0]))
 267#endif
 268
 269#ifndef is_dir_sep
 270#define is_dir_sep(c) ((c) == '/')
 271#endif
 272
 273#ifndef find_last_dir_sep
 274#define find_last_dir_sep(path) strrchr(path, '/')
 275#endif
 276
 277#if defined(__HP_cc) && (__HP_cc >= 61000)
 278#define NORETURN __attribute__((noreturn))
 279#define NORETURN_PTR
 280#elif defined(__GNUC__) && !defined(NO_NORETURN)
 281#define NORETURN __attribute__((__noreturn__))
 282#define NORETURN_PTR __attribute__((__noreturn__))
 283#elif defined(_MSC_VER)
 284#define NORETURN __declspec(noreturn)
 285#define NORETURN_PTR
 286#else
 287#define NORETURN
 288#define NORETURN_PTR
 289#ifndef __GNUC__
 290#ifndef __attribute__
 291#define __attribute__(x)
 292#endif
 293#endif
 294#endif
 295
 296/* The sentinel attribute is valid from gcc version 4.0 */
 297#if defined(__GNUC__) && (__GNUC__ >= 4)
 298#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 299#else
 300#define LAST_ARG_MUST_BE_NULL
 301#endif
 302
 303#include "compat/bswap.h"
 304
 305#include "wildmatch.h"
 306
 307/* General helper functions */
 308extern void vreportf(const char *prefix, const char *err, va_list params);
 309extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 310extern NORETURN void usage(const char *err);
 311extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 312extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 313extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 314extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 315extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 316
 317#ifndef NO_OPENSSL
 318#ifdef APPLE_COMMON_CRYPTO
 319#include "compat/apple-common-crypto.h"
 320#else
 321#include <openssl/evp.h>
 322#include <openssl/hmac.h>
 323#endif /* APPLE_COMMON_CRYPTO */
 324#include <openssl/x509v3.h>
 325#endif /* NO_OPENSSL */
 326
 327/*
 328 * Let callers be aware of the constant return value; this can help
 329 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 330 * because some compilers may not support variadic macros. Since we're only
 331 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 332 * using the function as usual.
 333 */
 334#if defined(__GNUC__)
 335static inline int const_error(void)
 336{
 337        return -1;
 338}
 339#define error(...) (error(__VA_ARGS__), const_error())
 340#endif
 341
 342extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 343extern void set_error_routine(void (*routine)(const char *err, va_list params));
 344extern void set_die_is_recursing_routine(int (*routine)(void));
 345
 346extern int starts_with(const char *str, const char *prefix);
 347
 348/*
 349 * If the string "str" begins with the string found in "prefix", return 1.
 350 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 351 * the string right after the prefix).
 352 *
 353 * Otherwise, return 0 and leave "out" untouched.
 354 *
 355 * Examples:
 356 *
 357 *   [extract branch name, fail if not a branch]
 358 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 359 *      return -1;
 360 *
 361 *   [skip prefix if present, otherwise use whole string]
 362 *   skip_prefix(name, "refs/heads/", &name);
 363 */
 364static inline int skip_prefix(const char *str, const char *prefix,
 365                              const char **out)
 366{
 367        do {
 368                if (!*prefix) {
 369                        *out = str;
 370                        return 1;
 371                }
 372        } while (*str++ == *prefix++);
 373        return 0;
 374}
 375
 376/*
 377 * If buf ends with suffix, return 1 and subtract the length of the suffix
 378 * from *len. Otherwise, return 0 and leave *len untouched.
 379 */
 380static inline int strip_suffix_mem(const char *buf, size_t *len,
 381                                   const char *suffix)
 382{
 383        size_t suflen = strlen(suffix);
 384        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 385                return 0;
 386        *len -= suflen;
 387        return 1;
 388}
 389
 390/*
 391 * If str ends with suffix, return 1 and set *len to the size of the string
 392 * without the suffix. Otherwise, return 0 and set *len to the size of the
 393 * string.
 394 *
 395 * Note that we do _not_ NUL-terminate str to the new length.
 396 */
 397static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 398{
 399        *len = strlen(str);
 400        return strip_suffix_mem(str, len, suffix);
 401}
 402
 403static inline int ends_with(const char *str, const char *suffix)
 404{
 405        size_t len;
 406        return strip_suffix(str, suffix, &len);
 407}
 408
 409#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 410
 411#ifndef PROT_READ
 412#define PROT_READ 1
 413#define PROT_WRITE 2
 414#define MAP_PRIVATE 1
 415#endif
 416
 417#define mmap git_mmap
 418#define munmap git_munmap
 419extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 420extern int git_munmap(void *start, size_t length);
 421
 422#else /* NO_MMAP || USE_WIN32_MMAP */
 423
 424#include <sys/mman.h>
 425
 426#endif /* NO_MMAP || USE_WIN32_MMAP */
 427
 428#ifdef NO_MMAP
 429
 430/* This value must be multiple of (pagesize * 2) */
 431#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 432
 433#else /* NO_MMAP */
 434
 435/* This value must be multiple of (pagesize * 2) */
 436#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 437        (sizeof(void*) >= 8 \
 438                ?  1 * 1024 * 1024 * 1024 \
 439                : 32 * 1024 * 1024)
 440
 441#endif /* NO_MMAP */
 442
 443#ifndef MAP_FAILED
 444#define MAP_FAILED ((void *)-1)
 445#endif
 446
 447#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 448#define on_disk_bytes(st) ((st).st_size)
 449#else
 450#define on_disk_bytes(st) ((st).st_blocks * 512)
 451#endif
 452
 453#define DEFAULT_PACKED_GIT_LIMIT \
 454        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 455
 456#ifdef NO_PREAD
 457#define pread git_pread
 458extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 459#endif
 460/*
 461 * Forward decl that will remind us if its twin in cache.h changes.
 462 * This function is used in compat/pread.c.  But we can't include
 463 * cache.h there.
 464 */
 465extern ssize_t read_in_full(int fd, void *buf, size_t count);
 466
 467#ifdef NO_SETENV
 468#define setenv gitsetenv
 469extern int gitsetenv(const char *, const char *, int);
 470#endif
 471
 472#ifdef NO_MKDTEMP
 473#define mkdtemp gitmkdtemp
 474extern char *gitmkdtemp(char *);
 475#endif
 476
 477#ifdef NO_MKSTEMPS
 478#define mkstemps gitmkstemps
 479extern int gitmkstemps(char *, int);
 480#endif
 481
 482#ifdef NO_UNSETENV
 483#define unsetenv gitunsetenv
 484extern void gitunsetenv(const char *);
 485#endif
 486
 487#ifdef NO_STRCASESTR
 488#define strcasestr gitstrcasestr
 489extern char *gitstrcasestr(const char *haystack, const char *needle);
 490#endif
 491
 492#ifdef NO_STRLCPY
 493#define strlcpy gitstrlcpy
 494extern size_t gitstrlcpy(char *, const char *, size_t);
 495#endif
 496
 497#ifdef NO_STRTOUMAX
 498#define strtoumax gitstrtoumax
 499extern uintmax_t gitstrtoumax(const char *, char **, int);
 500#define strtoimax gitstrtoimax
 501extern intmax_t gitstrtoimax(const char *, char **, int);
 502#endif
 503
 504#ifdef NO_HSTRERROR
 505#define hstrerror githstrerror
 506extern const char *githstrerror(int herror);
 507#endif
 508
 509#ifdef NO_MEMMEM
 510#define memmem gitmemmem
 511void *gitmemmem(const void *haystack, size_t haystacklen,
 512                const void *needle, size_t needlelen);
 513#endif
 514
 515#ifdef NO_GETPAGESIZE
 516#define getpagesize() sysconf(_SC_PAGESIZE)
 517#endif
 518
 519#ifdef FREAD_READS_DIRECTORIES
 520#ifdef fopen
 521#undef fopen
 522#endif
 523#define fopen(a,b) git_fopen(a,b)
 524extern FILE *git_fopen(const char*, const char*);
 525#endif
 526
 527#ifdef SNPRINTF_RETURNS_BOGUS
 528#ifdef snprintf
 529#undef snprintf
 530#endif
 531#define snprintf git_snprintf
 532extern int git_snprintf(char *str, size_t maxsize,
 533                        const char *format, ...);
 534#ifdef vsnprintf
 535#undef vsnprintf
 536#endif
 537#define vsnprintf git_vsnprintf
 538extern int git_vsnprintf(char *str, size_t maxsize,
 539                         const char *format, va_list ap);
 540#endif
 541
 542#ifdef __GLIBC_PREREQ
 543#if __GLIBC_PREREQ(2, 1)
 544#define HAVE_STRCHRNUL
 545#define HAVE_MEMPCPY
 546#endif
 547#endif
 548
 549#ifndef HAVE_STRCHRNUL
 550#define strchrnul gitstrchrnul
 551static inline char *gitstrchrnul(const char *s, int c)
 552{
 553        while (*s && *s != c)
 554                s++;
 555        return (char *)s;
 556}
 557#endif
 558
 559#ifndef HAVE_MEMPCPY
 560#define mempcpy gitmempcpy
 561static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 562{
 563        return (char *)memcpy(dest, src, n) + n;
 564}
 565#endif
 566
 567#ifdef NO_INET_PTON
 568int inet_pton(int af, const char *src, void *dst);
 569#endif
 570
 571#ifdef NO_INET_NTOP
 572const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 573#endif
 574
 575extern void release_pack_memory(size_t);
 576
 577typedef void (*try_to_free_t)(size_t);
 578extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 579
 580#ifdef HAVE_ALLOCA_H
 581# include <alloca.h>
 582# define xalloca(size)      (alloca(size))
 583# define xalloca_free(p)    do {} while (0)
 584#else
 585# define xalloca(size)      (xmalloc(size))
 586# define xalloca_free(p)    (free(p))
 587#endif
 588extern char *xstrdup(const char *str);
 589extern void *xmalloc(size_t size);
 590extern void *xmallocz(size_t size);
 591extern void *xmemdupz(const void *data, size_t len);
 592extern char *xstrndup(const char *str, size_t len);
 593extern void *xrealloc(void *ptr, size_t size);
 594extern void *xcalloc(size_t nmemb, size_t size);
 595extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 596extern ssize_t xread(int fd, void *buf, size_t len);
 597extern ssize_t xwrite(int fd, const void *buf, size_t len);
 598extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 599extern int xdup(int fd);
 600extern FILE *xfdopen(int fd, const char *mode);
 601extern int xmkstemp(char *template);
 602extern int xmkstemp_mode(char *template, int mode);
 603extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 604extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 605
 606static inline size_t xsize_t(off_t len)
 607{
 608        if (len > (size_t) len)
 609                die("Cannot handle files this big");
 610        return (size_t)len;
 611}
 612
 613/* in ctype.c, for kwset users */
 614extern const char tolower_trans_tbl[256];
 615
 616/* Sane ctype - no locale, and works with signed chars */
 617#undef isascii
 618#undef isspace
 619#undef isdigit
 620#undef isalpha
 621#undef isalnum
 622#undef isprint
 623#undef islower
 624#undef isupper
 625#undef tolower
 626#undef toupper
 627#undef iscntrl
 628#undef ispunct
 629#undef isxdigit
 630
 631extern const unsigned char sane_ctype[256];
 632#define GIT_SPACE 0x01
 633#define GIT_DIGIT 0x02
 634#define GIT_ALPHA 0x04
 635#define GIT_GLOB_SPECIAL 0x08
 636#define GIT_REGEX_SPECIAL 0x10
 637#define GIT_PATHSPEC_MAGIC 0x20
 638#define GIT_CNTRL 0x40
 639#define GIT_PUNCT 0x80
 640#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 641#define isascii(x) (((x) & ~0x7f) == 0)
 642#define isspace(x) sane_istest(x,GIT_SPACE)
 643#define isdigit(x) sane_istest(x,GIT_DIGIT)
 644#define isalpha(x) sane_istest(x,GIT_ALPHA)
 645#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 646#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 647#define islower(x) sane_iscase(x, 1)
 648#define isupper(x) sane_iscase(x, 0)
 649#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 650#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 651#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 652#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 653                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 654#define isxdigit(x) (hexval_table[x] != -1)
 655#define tolower(x) sane_case((unsigned char)(x), 0x20)
 656#define toupper(x) sane_case((unsigned char)(x), 0)
 657#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 658
 659static inline int sane_case(int x, int high)
 660{
 661        if (sane_istest(x, GIT_ALPHA))
 662                x = (x & ~0x20) | high;
 663        return x;
 664}
 665
 666static inline int sane_iscase(int x, int is_lower)
 667{
 668        if (!sane_istest(x, GIT_ALPHA))
 669                return 0;
 670
 671        if (is_lower)
 672                return (x & 0x20) != 0;
 673        else
 674                return (x & 0x20) == 0;
 675}
 676
 677static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 678{
 679        unsigned long ul;
 680        char *p;
 681
 682        errno = 0;
 683        ul = strtoul(s, &p, base);
 684        if (errno || *p || p == s || (unsigned int) ul != ul)
 685                return -1;
 686        *result = ul;
 687        return 0;
 688}
 689
 690static inline int strtol_i(char const *s, int base, int *result)
 691{
 692        long ul;
 693        char *p;
 694
 695        errno = 0;
 696        ul = strtol(s, &p, base);
 697        if (errno || *p || p == s || (int) ul != ul)
 698                return -1;
 699        *result = ul;
 700        return 0;
 701}
 702
 703#ifdef INTERNAL_QSORT
 704void git_qsort(void *base, size_t nmemb, size_t size,
 705               int(*compar)(const void *, const void *));
 706#define qsort git_qsort
 707#endif
 708
 709#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 710# define FORCE_DIR_SET_GID S_ISGID
 711#else
 712# define FORCE_DIR_SET_GID 0
 713#endif
 714
 715#ifdef NO_NSEC
 716#undef USE_NSEC
 717#define ST_CTIME_NSEC(st) 0
 718#define ST_MTIME_NSEC(st) 0
 719#else
 720#ifdef USE_ST_TIMESPEC
 721#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 722#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 723#else
 724#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 725#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 726#endif
 727#endif
 728
 729#ifdef UNRELIABLE_FSTAT
 730#define fstat_is_reliable() 0
 731#else
 732#define fstat_is_reliable() 1
 733#endif
 734
 735#ifndef va_copy
 736/*
 737 * Since an obvious implementation of va_list would be to make it a
 738 * pointer into the stack frame, a simple assignment will work on
 739 * many systems.  But let's try to be more portable.
 740 */
 741#ifdef __va_copy
 742#define va_copy(dst, src) __va_copy(dst, src)
 743#else
 744#define va_copy(dst, src) ((dst) = (src))
 745#endif
 746#endif
 747
 748#if defined(__GNUC__) || (_MSC_VER >= 1400)
 749#define HAVE_VARIADIC_MACROS 1
 750#endif
 751
 752/*
 753 * Preserves errno, prints a message, but gives no warning for ENOENT.
 754 * Always returns the return value of unlink(2).
 755 */
 756int unlink_or_warn(const char *path);
 757/*
 758 * Likewise for rmdir(2).
 759 */
 760int rmdir_or_warn(const char *path);
 761/*
 762 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 763 * the supplied file mode.
 764 */
 765int remove_or_warn(unsigned int mode, const char *path);
 766
 767/*
 768 * Call access(2), but warn for any error except "missing file"
 769 * (ENOENT or ENOTDIR).
 770 */
 771#define ACCESS_EACCES_OK (1U << 0)
 772int access_or_warn(const char *path, int mode, unsigned flag);
 773int access_or_die(const char *path, int mode, unsigned flag);
 774
 775/* Warn on an inaccessible file that ought to be accessible */
 776void warn_on_inaccessible(const char *path);
 777
 778/* Get the passwd entry for the UID of the current process. */
 779struct passwd *xgetpwuid_self(void);
 780
 781#ifdef GMTIME_UNRELIABLE_ERRORS
 782struct tm *git_gmtime(const time_t *);
 783struct tm *git_gmtime_r(const time_t *, struct tm *);
 784#define gmtime git_gmtime
 785#define gmtime_r git_gmtime_r
 786#endif
 787
 788#endif