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#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  80#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  81#endif
  82#define _ALL_SOURCE 1
  83#define _GNU_SOURCE 1
  84#define _BSD_SOURCE 1
  85#define _DEFAULT_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#if defined(__CYGWIN__)
 167#undef _XOPEN_SOURCE
 168#include <grp.h>
 169#define _XOPEN_SOURCE 600
 170#else
 171#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 172#include <grp.h>
 173#define _ALL_SOURCE 1
 174#endif
 175#endif
 176
 177/* used on Mac OS X */
 178#ifdef PRECOMPOSE_UNICODE
 179#include "compat/precompose_utf8.h"
 180#else
 181#define precompose_str(in,i_nfd2nfc)
 182#define precompose_argv(c,v)
 183#define probe_utf8_pathname_composition(a,b)
 184#endif
 185
 186#ifdef MKDIR_WO_TRAILING_SLASH
 187#define mkdir(a,b) compat_mkdir_wo_trailing_slash((a),(b))
 188extern int compat_mkdir_wo_trailing_slash(const char*, mode_t);
 189#endif
 190
 191#ifdef NO_STRUCT_ITIMERVAL
 192struct itimerval {
 193        struct timeval it_interval;
 194        struct timeval it_value;
 195};
 196#endif
 197
 198#ifdef NO_SETITIMER
 199#define setitimer(which,value,ovalue)
 200#endif
 201
 202#ifndef NO_LIBGEN_H
 203#include <libgen.h>
 204#else
 205#define basename gitbasename
 206extern char *gitbasename(char *);
 207#endif
 208
 209#ifndef NO_ICONV
 210#include <iconv.h>
 211#endif
 212
 213#ifndef NO_OPENSSL
 214#include <openssl/ssl.h>
 215#include <openssl/err.h>
 216#endif
 217
 218/* On most systems <netdb.h> would have given us this, but
 219 * not on some systems (e.g. z/OS).
 220 */
 221#ifndef NI_MAXHOST
 222#define NI_MAXHOST 1025
 223#endif
 224
 225#ifndef NI_MAXSERV
 226#define NI_MAXSERV 32
 227#endif
 228
 229/* On most systems <limits.h> would have given us this, but
 230 * not on some systems (e.g. GNU/Hurd).
 231 */
 232#ifndef PATH_MAX
 233#define PATH_MAX 4096
 234#endif
 235
 236#ifndef PRIuMAX
 237#define PRIuMAX "llu"
 238#endif
 239
 240#ifndef PRIu32
 241#define PRIu32 "u"
 242#endif
 243
 244#ifndef PRIx32
 245#define PRIx32 "x"
 246#endif
 247
 248#ifndef PRIo32
 249#define PRIo32 "o"
 250#endif
 251
 252#ifndef PATH_SEP
 253#define PATH_SEP ':'
 254#endif
 255
 256#ifdef HAVE_PATHS_H
 257#include <paths.h>
 258#endif
 259#ifndef _PATH_DEFPATH
 260#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 261#endif
 262
 263#ifndef STRIP_EXTENSION
 264#define STRIP_EXTENSION ""
 265#endif
 266
 267#ifndef has_dos_drive_prefix
 268static inline int git_has_dos_drive_prefix(const char *path)
 269{
 270        return 0;
 271}
 272#define has_dos_drive_prefix git_has_dos_drive_prefix
 273#endif
 274
 275#ifndef is_dir_sep
 276static inline int git_is_dir_sep(int c)
 277{
 278        return c == '/';
 279}
 280#define is_dir_sep git_is_dir_sep
 281#endif
 282
 283#ifndef offset_1st_component
 284static inline int git_offset_1st_component(const char *path)
 285{
 286        return is_dir_sep(path[0]);
 287}
 288#define offset_1st_component git_offset_1st_component
 289#endif
 290
 291#ifndef find_last_dir_sep
 292static inline char *git_find_last_dir_sep(const char *path)
 293{
 294        return strrchr(path, '/');
 295}
 296#define find_last_dir_sep git_find_last_dir_sep
 297#endif
 298
 299#if defined(__HP_cc) && (__HP_cc >= 61000)
 300#define NORETURN __attribute__((noreturn))
 301#define NORETURN_PTR
 302#elif defined(__GNUC__) && !defined(NO_NORETURN)
 303#define NORETURN __attribute__((__noreturn__))
 304#define NORETURN_PTR __attribute__((__noreturn__))
 305#elif defined(_MSC_VER)
 306#define NORETURN __declspec(noreturn)
 307#define NORETURN_PTR
 308#else
 309#define NORETURN
 310#define NORETURN_PTR
 311#ifndef __GNUC__
 312#ifndef __attribute__
 313#define __attribute__(x)
 314#endif
 315#endif
 316#endif
 317
 318/* The sentinel attribute is valid from gcc version 4.0 */
 319#if defined(__GNUC__) && (__GNUC__ >= 4)
 320#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 321#else
 322#define LAST_ARG_MUST_BE_NULL
 323#endif
 324
 325#include "compat/bswap.h"
 326
 327#include "wildmatch.h"
 328
 329struct strbuf;
 330
 331/* General helper functions */
 332extern void vreportf(const char *prefix, const char *err, va_list params);
 333extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 334extern NORETURN void usage(const char *err);
 335extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 336extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 337extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 338extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 339extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 340
 341#ifndef NO_OPENSSL
 342#ifdef APPLE_COMMON_CRYPTO
 343#include "compat/apple-common-crypto.h"
 344#else
 345#include <openssl/evp.h>
 346#include <openssl/hmac.h>
 347#endif /* APPLE_COMMON_CRYPTO */
 348#include <openssl/x509v3.h>
 349#endif /* NO_OPENSSL */
 350
 351/*
 352 * Let callers be aware of the constant return value; this can help
 353 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 354 * because some compilers may not support variadic macros. Since we're only
 355 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 356 * using the function as usual.
 357 */
 358#if defined(__GNUC__)
 359static inline int const_error(void)
 360{
 361        return -1;
 362}
 363#define error(...) (error(__VA_ARGS__), const_error())
 364#endif
 365
 366extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 367extern void set_error_routine(void (*routine)(const char *err, va_list params));
 368extern void set_die_is_recursing_routine(int (*routine)(void));
 369
 370extern int starts_with(const char *str, const char *prefix);
 371
 372/*
 373 * If the string "str" begins with the string found in "prefix", return 1.
 374 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 375 * the string right after the prefix).
 376 *
 377 * Otherwise, return 0 and leave "out" untouched.
 378 *
 379 * Examples:
 380 *
 381 *   [extract branch name, fail if not a branch]
 382 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 383 *      return -1;
 384 *
 385 *   [skip prefix if present, otherwise use whole string]
 386 *   skip_prefix(name, "refs/heads/", &name);
 387 */
 388static inline int skip_prefix(const char *str, const char *prefix,
 389                              const char **out)
 390{
 391        do {
 392                if (!*prefix) {
 393                        *out = str;
 394                        return 1;
 395                }
 396        } while (*str++ == *prefix++);
 397        return 0;
 398}
 399
 400/*
 401 * If buf ends with suffix, return 1 and subtract the length of the suffix
 402 * from *len. Otherwise, return 0 and leave *len untouched.
 403 */
 404static inline int strip_suffix_mem(const char *buf, size_t *len,
 405                                   const char *suffix)
 406{
 407        size_t suflen = strlen(suffix);
 408        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 409                return 0;
 410        *len -= suflen;
 411        return 1;
 412}
 413
 414/*
 415 * If str ends with suffix, return 1 and set *len to the size of the string
 416 * without the suffix. Otherwise, return 0 and set *len to the size of the
 417 * string.
 418 *
 419 * Note that we do _not_ NUL-terminate str to the new length.
 420 */
 421static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 422{
 423        *len = strlen(str);
 424        return strip_suffix_mem(str, len, suffix);
 425}
 426
 427static inline int ends_with(const char *str, const char *suffix)
 428{
 429        size_t len;
 430        return strip_suffix(str, suffix, &len);
 431}
 432
 433#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 434
 435#ifndef PROT_READ
 436#define PROT_READ 1
 437#define PROT_WRITE 2
 438#define MAP_PRIVATE 1
 439#endif
 440
 441#define mmap git_mmap
 442#define munmap git_munmap
 443extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 444extern int git_munmap(void *start, size_t length);
 445
 446#else /* NO_MMAP || USE_WIN32_MMAP */
 447
 448#include <sys/mman.h>
 449
 450#endif /* NO_MMAP || USE_WIN32_MMAP */
 451
 452#ifdef NO_MMAP
 453
 454/* This value must be multiple of (pagesize * 2) */
 455#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 456
 457#else /* NO_MMAP */
 458
 459/* This value must be multiple of (pagesize * 2) */
 460#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 461        (sizeof(void*) >= 8 \
 462                ?  1 * 1024 * 1024 * 1024 \
 463                : 32 * 1024 * 1024)
 464
 465#endif /* NO_MMAP */
 466
 467#ifndef MAP_FAILED
 468#define MAP_FAILED ((void *)-1)
 469#endif
 470
 471#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 472#define on_disk_bytes(st) ((st).st_size)
 473#else
 474#define on_disk_bytes(st) ((st).st_blocks * 512)
 475#endif
 476
 477#define DEFAULT_PACKED_GIT_LIMIT \
 478        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 479
 480#ifdef NO_PREAD
 481#define pread git_pread
 482extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 483#endif
 484/*
 485 * Forward decl that will remind us if its twin in cache.h changes.
 486 * This function is used in compat/pread.c.  But we can't include
 487 * cache.h there.
 488 */
 489extern ssize_t read_in_full(int fd, void *buf, size_t count);
 490
 491#ifdef NO_SETENV
 492#define setenv gitsetenv
 493extern int gitsetenv(const char *, const char *, int);
 494#endif
 495
 496#ifdef NO_MKDTEMP
 497#define mkdtemp gitmkdtemp
 498extern char *gitmkdtemp(char *);
 499#endif
 500
 501#ifdef NO_MKSTEMPS
 502#define mkstemps gitmkstemps
 503extern int gitmkstemps(char *, int);
 504#endif
 505
 506#ifdef NO_UNSETENV
 507#define unsetenv gitunsetenv
 508extern void gitunsetenv(const char *);
 509#endif
 510
 511#ifdef NO_STRCASESTR
 512#define strcasestr gitstrcasestr
 513extern char *gitstrcasestr(const char *haystack, const char *needle);
 514#endif
 515
 516#ifdef NO_STRLCPY
 517#define strlcpy gitstrlcpy
 518extern size_t gitstrlcpy(char *, const char *, size_t);
 519#endif
 520
 521#ifdef NO_STRTOUMAX
 522#define strtoumax gitstrtoumax
 523extern uintmax_t gitstrtoumax(const char *, char **, int);
 524#define strtoimax gitstrtoimax
 525extern intmax_t gitstrtoimax(const char *, char **, int);
 526#endif
 527
 528#ifdef NO_HSTRERROR
 529#define hstrerror githstrerror
 530extern const char *githstrerror(int herror);
 531#endif
 532
 533#ifdef NO_MEMMEM
 534#define memmem gitmemmem
 535void *gitmemmem(const void *haystack, size_t haystacklen,
 536                const void *needle, size_t needlelen);
 537#endif
 538
 539#ifdef NO_GETPAGESIZE
 540#define getpagesize() sysconf(_SC_PAGESIZE)
 541#endif
 542
 543#ifdef FREAD_READS_DIRECTORIES
 544#ifdef fopen
 545#undef fopen
 546#endif
 547#define fopen(a,b) git_fopen(a,b)
 548extern FILE *git_fopen(const char*, const char*);
 549#endif
 550
 551#ifdef SNPRINTF_RETURNS_BOGUS
 552#ifdef snprintf
 553#undef snprintf
 554#endif
 555#define snprintf git_snprintf
 556extern int git_snprintf(char *str, size_t maxsize,
 557                        const char *format, ...);
 558#ifdef vsnprintf
 559#undef vsnprintf
 560#endif
 561#define vsnprintf git_vsnprintf
 562extern int git_vsnprintf(char *str, size_t maxsize,
 563                         const char *format, va_list ap);
 564#endif
 565
 566#ifdef __GLIBC_PREREQ
 567#if __GLIBC_PREREQ(2, 1)
 568#define HAVE_STRCHRNUL
 569#define HAVE_MEMPCPY
 570#endif
 571#endif
 572
 573#ifndef HAVE_STRCHRNUL
 574#define strchrnul gitstrchrnul
 575static inline char *gitstrchrnul(const char *s, int c)
 576{
 577        while (*s && *s != c)
 578                s++;
 579        return (char *)s;
 580}
 581#endif
 582
 583#ifndef HAVE_MEMPCPY
 584#define mempcpy gitmempcpy
 585static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 586{
 587        return (char *)memcpy(dest, src, n) + n;
 588}
 589#endif
 590
 591#ifdef NO_INET_PTON
 592int inet_pton(int af, const char *src, void *dst);
 593#endif
 594
 595#ifdef NO_INET_NTOP
 596const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 597#endif
 598
 599#ifdef NO_PTHREADS
 600#define atexit git_atexit
 601extern int git_atexit(void (*handler)(void));
 602#endif
 603
 604extern void release_pack_memory(size_t);
 605
 606typedef void (*try_to_free_t)(size_t);
 607extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 608
 609#ifdef HAVE_ALLOCA_H
 610# include <alloca.h>
 611# define xalloca(size)      (alloca(size))
 612# define xalloca_free(p)    do {} while (0)
 613#else
 614# define xalloca(size)      (xmalloc(size))
 615# define xalloca_free(p)    (free(p))
 616#endif
 617extern char *xstrdup(const char *str);
 618extern void *xmalloc(size_t size);
 619extern void *xmallocz(size_t size);
 620extern void *xmallocz_gently(size_t size);
 621extern void *xmemdupz(const void *data, size_t len);
 622extern char *xstrndup(const char *str, size_t len);
 623extern void *xrealloc(void *ptr, size_t size);
 624extern void *xcalloc(size_t nmemb, size_t size);
 625extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 626extern ssize_t xread(int fd, void *buf, size_t len);
 627extern ssize_t xwrite(int fd, const void *buf, size_t len);
 628extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 629extern int xdup(int fd);
 630extern FILE *xfdopen(int fd, const char *mode);
 631extern int xmkstemp(char *template);
 632extern int xmkstemp_mode(char *template, int mode);
 633extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 634extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 635extern char *xgetcwd(void);
 636
 637#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 638
 639static inline size_t xsize_t(off_t len)
 640{
 641        if (len > (size_t) len)
 642                die("Cannot handle files this big");
 643        return (size_t)len;
 644}
 645
 646/* in ctype.c, for kwset users */
 647extern const char tolower_trans_tbl[256];
 648
 649/* Sane ctype - no locale, and works with signed chars */
 650#undef isascii
 651#undef isspace
 652#undef isdigit
 653#undef isalpha
 654#undef isalnum
 655#undef isprint
 656#undef islower
 657#undef isupper
 658#undef tolower
 659#undef toupper
 660#undef iscntrl
 661#undef ispunct
 662#undef isxdigit
 663
 664extern const unsigned char sane_ctype[256];
 665#define GIT_SPACE 0x01
 666#define GIT_DIGIT 0x02
 667#define GIT_ALPHA 0x04
 668#define GIT_GLOB_SPECIAL 0x08
 669#define GIT_REGEX_SPECIAL 0x10
 670#define GIT_PATHSPEC_MAGIC 0x20
 671#define GIT_CNTRL 0x40
 672#define GIT_PUNCT 0x80
 673#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 674#define isascii(x) (((x) & ~0x7f) == 0)
 675#define isspace(x) sane_istest(x,GIT_SPACE)
 676#define isdigit(x) sane_istest(x,GIT_DIGIT)
 677#define isalpha(x) sane_istest(x,GIT_ALPHA)
 678#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 679#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 680#define islower(x) sane_iscase(x, 1)
 681#define isupper(x) sane_iscase(x, 0)
 682#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 683#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 684#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 685#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 686                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 687#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 688#define tolower(x) sane_case((unsigned char)(x), 0x20)
 689#define toupper(x) sane_case((unsigned char)(x), 0)
 690#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 691
 692static inline int sane_case(int x, int high)
 693{
 694        if (sane_istest(x, GIT_ALPHA))
 695                x = (x & ~0x20) | high;
 696        return x;
 697}
 698
 699static inline int sane_iscase(int x, int is_lower)
 700{
 701        if (!sane_istest(x, GIT_ALPHA))
 702                return 0;
 703
 704        if (is_lower)
 705                return (x & 0x20) != 0;
 706        else
 707                return (x & 0x20) == 0;
 708}
 709
 710static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 711{
 712        unsigned long ul;
 713        char *p;
 714
 715        errno = 0;
 716        ul = strtoul(s, &p, base);
 717        if (errno || *p || p == s || (unsigned int) ul != ul)
 718                return -1;
 719        *result = ul;
 720        return 0;
 721}
 722
 723static inline int strtol_i(char const *s, int base, int *result)
 724{
 725        long ul;
 726        char *p;
 727
 728        errno = 0;
 729        ul = strtol(s, &p, base);
 730        if (errno || *p || p == s || (int) ul != ul)
 731                return -1;
 732        *result = ul;
 733        return 0;
 734}
 735
 736#ifdef INTERNAL_QSORT
 737void git_qsort(void *base, size_t nmemb, size_t size,
 738               int(*compar)(const void *, const void *));
 739#define qsort git_qsort
 740#endif
 741
 742#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 743# define FORCE_DIR_SET_GID S_ISGID
 744#else
 745# define FORCE_DIR_SET_GID 0
 746#endif
 747
 748#ifdef NO_NSEC
 749#undef USE_NSEC
 750#define ST_CTIME_NSEC(st) 0
 751#define ST_MTIME_NSEC(st) 0
 752#else
 753#ifdef USE_ST_TIMESPEC
 754#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 755#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 756#else
 757#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 758#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 759#endif
 760#endif
 761
 762#ifdef UNRELIABLE_FSTAT
 763#define fstat_is_reliable() 0
 764#else
 765#define fstat_is_reliable() 1
 766#endif
 767
 768#ifndef va_copy
 769/*
 770 * Since an obvious implementation of va_list would be to make it a
 771 * pointer into the stack frame, a simple assignment will work on
 772 * many systems.  But let's try to be more portable.
 773 */
 774#ifdef __va_copy
 775#define va_copy(dst, src) __va_copy(dst, src)
 776#else
 777#define va_copy(dst, src) ((dst) = (src))
 778#endif
 779#endif
 780
 781#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 782#define HAVE_VARIADIC_MACROS 1
 783#endif
 784
 785/*
 786 * Preserves errno, prints a message, but gives no warning for ENOENT.
 787 * Returns 0 on success, which includes trying to unlink an object that does
 788 * not exist.
 789 */
 790int unlink_or_warn(const char *path);
 791 /*
 792  * Tries to unlink file.  Returns 0 if unlink succeeded
 793  * or the file already didn't exist.  Returns -1 and
 794  * appends a message to err suitable for
 795  * 'error("%s", err->buf)' on error.
 796  */
 797int unlink_or_msg(const char *file, struct strbuf *err);
 798/*
 799 * Preserves errno, prints a message, but gives no warning for ENOENT.
 800 * Returns 0 on success, which includes trying to remove a directory that does
 801 * not exist.
 802 */
 803int rmdir_or_warn(const char *path);
 804/*
 805 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 806 * the supplied file mode.
 807 */
 808int remove_or_warn(unsigned int mode, const char *path);
 809
 810/*
 811 * Call access(2), but warn for any error except "missing file"
 812 * (ENOENT or ENOTDIR).
 813 */
 814#define ACCESS_EACCES_OK (1U << 0)
 815int access_or_warn(const char *path, int mode, unsigned flag);
 816int access_or_die(const char *path, int mode, unsigned flag);
 817
 818/* Warn on an inaccessible file that ought to be accessible */
 819void warn_on_inaccessible(const char *path);
 820
 821/* Get the passwd entry for the UID of the current process. */
 822struct passwd *xgetpwuid_self(void);
 823
 824#ifdef GMTIME_UNRELIABLE_ERRORS
 825struct tm *git_gmtime(const time_t *);
 826struct tm *git_gmtime_r(const time_t *, struct tm *);
 827#define gmtime git_gmtime
 828#define gmtime_r git_gmtime_r
 829#endif
 830
 831#endif