Andrew's git / gitweb.git / git-compat-util.h
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git-compat-util.hon commit Merge branch 'mh/find-uniq-abbrev' (5109f2a)
   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#include <openssl/ssl.h>
 216#include <openssl/err.h>
 217#endif
 218
 219/* On most systems <netdb.h> would have given us this, but
 220 * not on some systems (e.g. z/OS).
 221 */
 222#ifndef NI_MAXHOST
 223#define NI_MAXHOST 1025
 224#endif
 225
 226#ifndef NI_MAXSERV
 227#define NI_MAXSERV 32
 228#endif
 229
 230/* On most systems <limits.h> would have given us this, but
 231 * not on some systems (e.g. GNU/Hurd).
 232 */
 233#ifndef PATH_MAX
 234#define PATH_MAX 4096
 235#endif
 236
 237#ifndef PRIuMAX
 238#define PRIuMAX "llu"
 239#endif
 240
 241#ifndef PRIu32
 242#define PRIu32 "u"
 243#endif
 244
 245#ifndef PRIx32
 246#define PRIx32 "x"
 247#endif
 248
 249#ifndef PRIo32
 250#define PRIo32 "o"
 251#endif
 252
 253#ifndef PATH_SEP
 254#define PATH_SEP ':'
 255#endif
 256
 257#ifdef HAVE_PATHS_H
 258#include <paths.h>
 259#endif
 260#ifndef _PATH_DEFPATH
 261#define _PATH_DEFPATH "/usr/local/bin:/usr/bin:/bin"
 262#endif
 263
 264#ifndef STRIP_EXTENSION
 265#define STRIP_EXTENSION ""
 266#endif
 267
 268#ifndef has_dos_drive_prefix
 269static inline int git_has_dos_drive_prefix(const char *path)
 270{
 271        return 0;
 272}
 273#define has_dos_drive_prefix git_has_dos_drive_prefix
 274#endif
 275
 276#ifndef is_dir_sep
 277static inline int git_is_dir_sep(int c)
 278{
 279        return c == '/';
 280}
 281#define is_dir_sep git_is_dir_sep
 282#endif
 283
 284#ifndef offset_1st_component
 285static inline int git_offset_1st_component(const char *path)
 286{
 287        return is_dir_sep(path[0]);
 288}
 289#define offset_1st_component git_offset_1st_component
 290#endif
 291
 292#ifndef find_last_dir_sep
 293static inline char *git_find_last_dir_sep(const char *path)
 294{
 295        return strrchr(path, '/');
 296}
 297#define find_last_dir_sep git_find_last_dir_sep
 298#endif
 299
 300#if defined(__HP_cc) && (__HP_cc >= 61000)
 301#define NORETURN __attribute__((noreturn))
 302#define NORETURN_PTR
 303#elif defined(__GNUC__) && !defined(NO_NORETURN)
 304#define NORETURN __attribute__((__noreturn__))
 305#define NORETURN_PTR __attribute__((__noreturn__))
 306#elif defined(_MSC_VER)
 307#define NORETURN __declspec(noreturn)
 308#define NORETURN_PTR
 309#else
 310#define NORETURN
 311#define NORETURN_PTR
 312#ifndef __GNUC__
 313#ifndef __attribute__
 314#define __attribute__(x)
 315#endif
 316#endif
 317#endif
 318
 319/* The sentinel attribute is valid from gcc version 4.0 */
 320#if defined(__GNUC__) && (__GNUC__ >= 4)
 321#define LAST_ARG_MUST_BE_NULL __attribute__((sentinel))
 322#else
 323#define LAST_ARG_MUST_BE_NULL
 324#endif
 325
 326#include "compat/bswap.h"
 327
 328#include "wildmatch.h"
 329
 330struct strbuf;
 331
 332/* General helper functions */
 333extern void vreportf(const char *prefix, const char *err, va_list params);
 334extern void vwritef(int fd, const char *prefix, const char *err, va_list params);
 335extern NORETURN void usage(const char *err);
 336extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 337extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 338extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 339extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 340extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 341
 342#ifndef NO_OPENSSL
 343#ifdef APPLE_COMMON_CRYPTO
 344#include "compat/apple-common-crypto.h"
 345#else
 346#include <openssl/evp.h>
 347#include <openssl/hmac.h>
 348#endif /* APPLE_COMMON_CRYPTO */
 349#include <openssl/x509v3.h>
 350#endif /* NO_OPENSSL */
 351
 352/*
 353 * Let callers be aware of the constant return value; this can help
 354 * gcc with -Wuninitialized analysis. We restrict this trick to gcc, though,
 355 * because some compilers may not support variadic macros. Since we're only
 356 * trying to help gcc, anyway, it's OK; other compilers will fall back to
 357 * using the function as usual.
 358 */
 359#if defined(__GNUC__)
 360static inline int const_error(void)
 361{
 362        return -1;
 363}
 364#define error(...) (error(__VA_ARGS__), const_error())
 365#endif
 366
 367extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 368extern void set_error_routine(void (*routine)(const char *err, va_list params));
 369extern void set_die_is_recursing_routine(int (*routine)(void));
 370
 371extern int starts_with(const char *str, const char *prefix);
 372
 373/*
 374 * If the string "str" begins with the string found in "prefix", return 1.
 375 * The "out" parameter is set to "str + strlen(prefix)" (i.e., to the point in
 376 * the string right after the prefix).
 377 *
 378 * Otherwise, return 0 and leave "out" untouched.
 379 *
 380 * Examples:
 381 *
 382 *   [extract branch name, fail if not a branch]
 383 *   if (!skip_prefix(ref, "refs/heads/", &branch)
 384 *      return -1;
 385 *
 386 *   [skip prefix if present, otherwise use whole string]
 387 *   skip_prefix(name, "refs/heads/", &name);
 388 */
 389static inline int skip_prefix(const char *str, const char *prefix,
 390                              const char **out)
 391{
 392        do {
 393                if (!*prefix) {
 394                        *out = str;
 395                        return 1;
 396                }
 397        } while (*str++ == *prefix++);
 398        return 0;
 399}
 400
 401/*
 402 * If buf ends with suffix, return 1 and subtract the length of the suffix
 403 * from *len. Otherwise, return 0 and leave *len untouched.
 404 */
 405static inline int strip_suffix_mem(const char *buf, size_t *len,
 406                                   const char *suffix)
 407{
 408        size_t suflen = strlen(suffix);
 409        if (*len < suflen || memcmp(buf + (*len - suflen), suffix, suflen))
 410                return 0;
 411        *len -= suflen;
 412        return 1;
 413}
 414
 415/*
 416 * If str ends with suffix, return 1 and set *len to the size of the string
 417 * without the suffix. Otherwise, return 0 and set *len to the size of the
 418 * string.
 419 *
 420 * Note that we do _not_ NUL-terminate str to the new length.
 421 */
 422static inline int strip_suffix(const char *str, const char *suffix, size_t *len)
 423{
 424        *len = strlen(str);
 425        return strip_suffix_mem(str, len, suffix);
 426}
 427
 428static inline int ends_with(const char *str, const char *suffix)
 429{
 430        size_t len;
 431        return strip_suffix(str, suffix, &len);
 432}
 433
 434#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 435
 436#ifndef PROT_READ
 437#define PROT_READ 1
 438#define PROT_WRITE 2
 439#define MAP_PRIVATE 1
 440#endif
 441
 442#define mmap git_mmap
 443#define munmap git_munmap
 444extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 445extern int git_munmap(void *start, size_t length);
 446
 447#else /* NO_MMAP || USE_WIN32_MMAP */
 448
 449#include <sys/mman.h>
 450
 451#endif /* NO_MMAP || USE_WIN32_MMAP */
 452
 453#ifdef NO_MMAP
 454
 455/* This value must be multiple of (pagesize * 2) */
 456#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 457
 458#else /* NO_MMAP */
 459
 460/* This value must be multiple of (pagesize * 2) */
 461#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 462        (sizeof(void*) >= 8 \
 463                ?  1 * 1024 * 1024 * 1024 \
 464                : 32 * 1024 * 1024)
 465
 466#endif /* NO_MMAP */
 467
 468#ifndef MAP_FAILED
 469#define MAP_FAILED ((void *)-1)
 470#endif
 471
 472#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 473#define on_disk_bytes(st) ((st).st_size)
 474#else
 475#define on_disk_bytes(st) ((st).st_blocks * 512)
 476#endif
 477
 478#define DEFAULT_PACKED_GIT_LIMIT \
 479        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 480
 481#ifdef NO_PREAD
 482#define pread git_pread
 483extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 484#endif
 485/*
 486 * Forward decl that will remind us if its twin in cache.h changes.
 487 * This function is used in compat/pread.c.  But we can't include
 488 * cache.h there.
 489 */
 490extern ssize_t read_in_full(int fd, void *buf, size_t count);
 491
 492#ifdef NO_SETENV
 493#define setenv gitsetenv
 494extern int gitsetenv(const char *, const char *, int);
 495#endif
 496
 497#ifdef NO_MKDTEMP
 498#define mkdtemp gitmkdtemp
 499extern char *gitmkdtemp(char *);
 500#endif
 501
 502#ifdef NO_MKSTEMPS
 503#define mkstemps gitmkstemps
 504extern int gitmkstemps(char *, int);
 505#endif
 506
 507#ifdef NO_UNSETENV
 508#define unsetenv gitunsetenv
 509extern void gitunsetenv(const char *);
 510#endif
 511
 512#ifdef NO_STRCASESTR
 513#define strcasestr gitstrcasestr
 514extern char *gitstrcasestr(const char *haystack, const char *needle);
 515#endif
 516
 517#ifdef NO_STRLCPY
 518#define strlcpy gitstrlcpy
 519extern size_t gitstrlcpy(char *, const char *, size_t);
 520#endif
 521
 522#ifdef NO_STRTOUMAX
 523#define strtoumax gitstrtoumax
 524extern uintmax_t gitstrtoumax(const char *, char **, int);
 525#define strtoimax gitstrtoimax
 526extern intmax_t gitstrtoimax(const char *, char **, int);
 527#endif
 528
 529#ifdef NO_HSTRERROR
 530#define hstrerror githstrerror
 531extern const char *githstrerror(int herror);
 532#endif
 533
 534#ifdef NO_MEMMEM
 535#define memmem gitmemmem
 536void *gitmemmem(const void *haystack, size_t haystacklen,
 537                const void *needle, size_t needlelen);
 538#endif
 539
 540#ifdef NO_GETPAGESIZE
 541#define getpagesize() sysconf(_SC_PAGESIZE)
 542#endif
 543
 544#ifdef FREAD_READS_DIRECTORIES
 545#ifdef fopen
 546#undef fopen
 547#endif
 548#define fopen(a,b) git_fopen(a,b)
 549extern FILE *git_fopen(const char*, const char*);
 550#endif
 551
 552#ifdef SNPRINTF_RETURNS_BOGUS
 553#ifdef snprintf
 554#undef snprintf
 555#endif
 556#define snprintf git_snprintf
 557extern int git_snprintf(char *str, size_t maxsize,
 558                        const char *format, ...);
 559#ifdef vsnprintf
 560#undef vsnprintf
 561#endif
 562#define vsnprintf git_vsnprintf
 563extern int git_vsnprintf(char *str, size_t maxsize,
 564                         const char *format, va_list ap);
 565#endif
 566
 567#ifdef __GLIBC_PREREQ
 568#if __GLIBC_PREREQ(2, 1)
 569#define HAVE_STRCHRNUL
 570#define HAVE_MEMPCPY
 571#endif
 572#endif
 573
 574#ifndef HAVE_STRCHRNUL
 575#define strchrnul gitstrchrnul
 576static inline char *gitstrchrnul(const char *s, int c)
 577{
 578        while (*s && *s != c)
 579                s++;
 580        return (char *)s;
 581}
 582#endif
 583
 584#ifndef HAVE_MEMPCPY
 585#define mempcpy gitmempcpy
 586static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 587{
 588        return (char *)memcpy(dest, src, n) + n;
 589}
 590#endif
 591
 592#ifdef NO_INET_PTON
 593int inet_pton(int af, const char *src, void *dst);
 594#endif
 595
 596#ifdef NO_INET_NTOP
 597const char *inet_ntop(int af, const void *src, char *dst, size_t size);
 598#endif
 599
 600#ifdef NO_PTHREADS
 601#define atexit git_atexit
 602extern int git_atexit(void (*handler)(void));
 603#endif
 604
 605extern void release_pack_memory(size_t);
 606
 607typedef void (*try_to_free_t)(size_t);
 608extern try_to_free_t set_try_to_free_routine(try_to_free_t);
 609
 610#ifdef HAVE_ALLOCA_H
 611# include <alloca.h>
 612# define xalloca(size)      (alloca(size))
 613# define xalloca_free(p)    do {} while (0)
 614#else
 615# define xalloca(size)      (xmalloc(size))
 616# define xalloca_free(p)    (free(p))
 617#endif
 618extern char *xstrdup(const char *str);
 619extern void *xmalloc(size_t size);
 620extern void *xmallocz(size_t size);
 621extern void *xmallocz_gently(size_t size);
 622extern void *xmemdupz(const void *data, size_t len);
 623extern char *xstrndup(const char *str, size_t len);
 624extern void *xrealloc(void *ptr, size_t size);
 625extern void *xcalloc(size_t nmemb, size_t size);
 626extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 627extern ssize_t xread(int fd, void *buf, size_t len);
 628extern ssize_t xwrite(int fd, const void *buf, size_t len);
 629extern ssize_t xpread(int fd, void *buf, size_t len, off_t offset);
 630extern int xdup(int fd);
 631extern FILE *xfdopen(int fd, const char *mode);
 632extern int xmkstemp(char *template);
 633extern int xmkstemp_mode(char *template, int mode);
 634extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 635extern int odb_pack_keep(char *name, size_t namesz, const unsigned char *sha1);
 636extern char *xgetcwd(void);
 637
 638#define REALLOC_ARRAY(x, alloc) (x) = xrealloc((x), (alloc) * sizeof(*(x)))
 639
 640static inline size_t xsize_t(off_t len)
 641{
 642        if (len > (size_t) len)
 643                die("Cannot handle files this big");
 644        return (size_t)len;
 645}
 646
 647/* in ctype.c, for kwset users */
 648extern const char tolower_trans_tbl[256];
 649
 650/* Sane ctype - no locale, and works with signed chars */
 651#undef isascii
 652#undef isspace
 653#undef isdigit
 654#undef isalpha
 655#undef isalnum
 656#undef isprint
 657#undef islower
 658#undef isupper
 659#undef tolower
 660#undef toupper
 661#undef iscntrl
 662#undef ispunct
 663#undef isxdigit
 664
 665extern const unsigned char sane_ctype[256];
 666#define GIT_SPACE 0x01
 667#define GIT_DIGIT 0x02
 668#define GIT_ALPHA 0x04
 669#define GIT_GLOB_SPECIAL 0x08
 670#define GIT_REGEX_SPECIAL 0x10
 671#define GIT_PATHSPEC_MAGIC 0x20
 672#define GIT_CNTRL 0x40
 673#define GIT_PUNCT 0x80
 674#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 675#define isascii(x) (((x) & ~0x7f) == 0)
 676#define isspace(x) sane_istest(x,GIT_SPACE)
 677#define isdigit(x) sane_istest(x,GIT_DIGIT)
 678#define isalpha(x) sane_istest(x,GIT_ALPHA)
 679#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 680#define isprint(x) ((x) >= 0x20 && (x) <= 0x7e)
 681#define islower(x) sane_iscase(x, 1)
 682#define isupper(x) sane_iscase(x, 0)
 683#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 684#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 685#define iscntrl(x) (sane_istest(x,GIT_CNTRL))
 686#define ispunct(x) sane_istest(x, GIT_PUNCT | GIT_REGEX_SPECIAL | \
 687                GIT_GLOB_SPECIAL | GIT_PATHSPEC_MAGIC)
 688#define isxdigit(x) (hexval_table[(unsigned char)(x)] != -1)
 689#define tolower(x) sane_case((unsigned char)(x), 0x20)
 690#define toupper(x) sane_case((unsigned char)(x), 0)
 691#define is_pathspec_magic(x) sane_istest(x,GIT_PATHSPEC_MAGIC)
 692
 693static inline int sane_case(int x, int high)
 694{
 695        if (sane_istest(x, GIT_ALPHA))
 696                x = (x & ~0x20) | high;
 697        return x;
 698}
 699
 700static inline int sane_iscase(int x, int is_lower)
 701{
 702        if (!sane_istest(x, GIT_ALPHA))
 703                return 0;
 704
 705        if (is_lower)
 706                return (x & 0x20) != 0;
 707        else
 708                return (x & 0x20) == 0;
 709}
 710
 711static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 712{
 713        unsigned long ul;
 714        char *p;
 715
 716        errno = 0;
 717        ul = strtoul(s, &p, base);
 718        if (errno || *p || p == s || (unsigned int) ul != ul)
 719                return -1;
 720        *result = ul;
 721        return 0;
 722}
 723
 724static inline int strtol_i(char const *s, int base, int *result)
 725{
 726        long ul;
 727        char *p;
 728
 729        errno = 0;
 730        ul = strtol(s, &p, base);
 731        if (errno || *p || p == s || (int) ul != ul)
 732                return -1;
 733        *result = ul;
 734        return 0;
 735}
 736
 737#ifdef INTERNAL_QSORT
 738void git_qsort(void *base, size_t nmemb, size_t size,
 739               int(*compar)(const void *, const void *));
 740#define qsort git_qsort
 741#endif
 742
 743#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 744# define FORCE_DIR_SET_GID S_ISGID
 745#else
 746# define FORCE_DIR_SET_GID 0
 747#endif
 748
 749#ifdef NO_NSEC
 750#undef USE_NSEC
 751#define ST_CTIME_NSEC(st) 0
 752#define ST_MTIME_NSEC(st) 0
 753#else
 754#ifdef USE_ST_TIMESPEC
 755#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 756#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 757#else
 758#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 759#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 760#endif
 761#endif
 762
 763#ifdef UNRELIABLE_FSTAT
 764#define fstat_is_reliable() 0
 765#else
 766#define fstat_is_reliable() 1
 767#endif
 768
 769#ifndef va_copy
 770/*
 771 * Since an obvious implementation of va_list would be to make it a
 772 * pointer into the stack frame, a simple assignment will work on
 773 * many systems.  But let's try to be more portable.
 774 */
 775#ifdef __va_copy
 776#define va_copy(dst, src) __va_copy(dst, src)
 777#else
 778#define va_copy(dst, src) ((dst) = (src))
 779#endif
 780#endif
 781
 782#if defined(__GNUC__) || (_MSC_VER >= 1400) || defined(__C99_MACRO_WITH_VA_ARGS)
 783#define HAVE_VARIADIC_MACROS 1
 784#endif
 785
 786/*
 787 * Preserves errno, prints a message, but gives no warning for ENOENT.
 788 * Returns 0 on success, which includes trying to unlink an object that does
 789 * not exist.
 790 */
 791int unlink_or_warn(const char *path);
 792 /*
 793  * Tries to unlink file.  Returns 0 if unlink succeeded
 794  * or the file already didn't exist.  Returns -1 and
 795  * appends a message to err suitable for
 796  * 'error("%s", err->buf)' on error.
 797  */
 798int unlink_or_msg(const char *file, struct strbuf *err);
 799/*
 800 * Preserves errno, prints a message, but gives no warning for ENOENT.
 801 * Returns 0 on success, which includes trying to remove a directory that does
 802 * not exist.
 803 */
 804int rmdir_or_warn(const char *path);
 805/*
 806 * Calls the correct function out of {unlink,rmdir}_or_warn based on
 807 * the supplied file mode.
 808 */
 809int remove_or_warn(unsigned int mode, const char *path);
 810
 811/*
 812 * Call access(2), but warn for any error except "missing file"
 813 * (ENOENT or ENOTDIR).
 814 */
 815#define ACCESS_EACCES_OK (1U << 0)
 816int access_or_warn(const char *path, int mode, unsigned flag);
 817int access_or_die(const char *path, int mode, unsigned flag);
 818
 819/* Warn on an inaccessible file that ought to be accessible */
 820void warn_on_inaccessible(const char *path);
 821
 822/* Get the passwd entry for the UID of the current process. */
 823struct passwd *xgetpwuid_self(void);
 824
 825#ifdef GMTIME_UNRELIABLE_ERRORS
 826struct tm *git_gmtime(const time_t *);
 827struct tm *git_gmtime_r(const time_t *, struct tm *);
 828#define gmtime git_gmtime
 829#define gmtime_r git_gmtime_r
 830#endif
 831
 832#endif