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#ifdef __GNUC__
  32#define TYPEOF(x) (__typeof__(x))
  33#else
  34#define TYPEOF(x)
  35#endif
  36
  37#define MSB(x, bits) ((x) & TYPEOF(x)(~0ULL << (bitsizeof(x) - (bits))))
  38#define HAS_MULTI_BITS(i)  ((i) & ((i) - 1))  /* checks if an integer has more than 1 bit set */
  39
  40#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
  41
  42/* Approximation of the length of the decimal representation of this type. */
  43#define decimal_length(x)       ((int)(sizeof(x) * 2.56 + 0.5) + 1)
  44
  45#if defined(__sun__)
  46 /*
  47  * On Solaris, when _XOPEN_EXTENDED is set, its header file
  48  * forces the programs to be XPG4v2, defeating any _XOPEN_SOURCE
  49  * setting to say we are XPG5 or XPG6.  Also on Solaris,
  50  * XPG6 programs must be compiled with a c99 compiler, while
  51  * non XPG6 programs must be compiled with a pre-c99 compiler.
  52  */
  53# if __STDC_VERSION__ - 0 >= 199901L
  54# define _XOPEN_SOURCE 600
  55# else
  56# define _XOPEN_SOURCE 500
  57# endif
  58#elif !defined(__APPLE__) && !defined(__FreeBSD__) && !defined(__USLC__) && \
  59      !defined(_M_UNIX) && !defined(sgi) && !defined(__DragonFly__)
  60#define _XOPEN_SOURCE 600 /* glibc2 and AIX 5.3L need 500, OpenBSD needs 600 for S_ISLNK() */
  61#define _XOPEN_SOURCE_EXTENDED 1 /* AIX 5.3L needs this */
  62#endif
  63#define _ALL_SOURCE 1
  64#define _GNU_SOURCE 1
  65#define _BSD_SOURCE 1
  66#define _NETBSD_SOURCE 1
  67#define _SGI_SOURCE 1
  68
  69#ifdef WIN32 /* Both MinGW and MSVC */
  70#define WIN32_LEAN_AND_MEAN  /* stops windows.h including winsock.h */
  71#include <winsock2.h>
  72#include <windows.h>
  73#endif
  74
  75#include <unistd.h>
  76#include <stdio.h>
  77#include <sys/stat.h>
  78#include <fcntl.h>
  79#include <stddef.h>
  80#include <stdlib.h>
  81#include <stdarg.h>
  82#include <string.h>
  83#include <errno.h>
  84#include <limits.h>
  85#include <sys/param.h>
  86#include <sys/types.h>
  87#include <dirent.h>
  88#include <sys/time.h>
  89#include <time.h>
  90#include <signal.h>
  91#include <fnmatch.h>
  92#include <assert.h>
  93#include <regex.h>
  94#include <utime.h>
  95#ifndef __MINGW32__
  96#include <sys/wait.h>
  97#include <sys/poll.h>
  98#include <sys/socket.h>
  99#include <sys/ioctl.h>
 100#include <termios.h>
 101#ifndef NO_SYS_SELECT_H
 102#include <sys/select.h>
 103#endif
 104#include <netinet/in.h>
 105#include <netinet/tcp.h>
 106#include <arpa/inet.h>
 107#include <netdb.h>
 108#include <pwd.h>
 109#include <inttypes.h>
 110#if defined(__CYGWIN__)
 111#undef _XOPEN_SOURCE
 112#include <grp.h>
 113#define _XOPEN_SOURCE 600
 114#include "compat/cygwin.h"
 115#else
 116#undef _ALL_SOURCE /* AIX 5.3L defines a struct list with _ALL_SOURCE. */
 117#include <grp.h>
 118#define _ALL_SOURCE 1
 119#endif
 120#else   /* __MINGW32__ */
 121/* pull in Windows compatibility stuff */
 122#include "compat/mingw.h"
 123#endif  /* __MINGW32__ */
 124#ifdef _MSC_VER
 125#include "compat/msvc.h"
 126#endif
 127
 128#ifndef NO_LIBGEN_H
 129#include <libgen.h>
 130#else
 131#define basename gitbasename
 132extern char *gitbasename(char *);
 133#endif
 134
 135#ifndef NO_ICONV
 136#include <iconv.h>
 137#endif
 138
 139#ifndef NO_OPENSSL
 140#include <openssl/ssl.h>
 141#include <openssl/err.h>
 142#endif
 143
 144/* On most systems <limits.h> would have given us this, but
 145 * not on some systems (e.g. GNU/Hurd).
 146 */
 147#ifndef PATH_MAX
 148#define PATH_MAX 4096
 149#endif
 150
 151#ifndef PRIuMAX
 152#define PRIuMAX "llu"
 153#endif
 154
 155#ifndef PRIu32
 156#define PRIu32 "u"
 157#endif
 158
 159#ifndef PRIx32
 160#define PRIx32 "x"
 161#endif
 162
 163#ifndef PATH_SEP
 164#define PATH_SEP ':'
 165#endif
 166
 167#ifndef STRIP_EXTENSION
 168#define STRIP_EXTENSION ""
 169#endif
 170
 171#ifndef has_dos_drive_prefix
 172#define has_dos_drive_prefix(path) 0
 173#endif
 174
 175#ifndef is_dir_sep
 176#define is_dir_sep(c) ((c) == '/')
 177#endif
 178
 179#ifdef __GNUC__
 180#define NORETURN __attribute__((__noreturn__))
 181#define NORETURN_PTR __attribute__((__noreturn__))
 182#elif defined(_MSC_VER)
 183#define NORETURN __declspec(noreturn)
 184#define NORETURN_PTR
 185#else
 186#define NORETURN
 187#define NORETURN_PTR
 188#ifndef __attribute__
 189#define __attribute__(x)
 190#endif
 191#endif
 192
 193#include "compat/bswap.h"
 194
 195/* General helper functions */
 196extern NORETURN void usage(const char *err);
 197extern NORETURN void usagef(const char *err, ...) __attribute__((format (printf, 1, 2)));
 198extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 199extern NORETURN void die_errno(const char *err, ...) __attribute__((format (printf, 1, 2)));
 200extern int error(const char *err, ...) __attribute__((format (printf, 1, 2)));
 201extern void warning(const char *err, ...) __attribute__((format (printf, 1, 2)));
 202
 203extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));
 204
 205extern int prefixcmp(const char *str, const char *prefix);
 206extern int suffixcmp(const char *str, const char *suffix);
 207
 208static inline const char *skip_prefix(const char *str, const char *prefix)
 209{
 210        size_t len = strlen(prefix);
 211        return strncmp(str, prefix, len) ? NULL : str + len;
 212}
 213
 214#if defined(NO_MMAP) || defined(USE_WIN32_MMAP)
 215
 216#ifndef PROT_READ
 217#define PROT_READ 1
 218#define PROT_WRITE 2
 219#define MAP_PRIVATE 1
 220#endif
 221
 222#define mmap git_mmap
 223#define munmap git_munmap
 224extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 225extern int git_munmap(void *start, size_t length);
 226
 227#else /* NO_MMAP || USE_WIN32_MMAP */
 228
 229#include <sys/mman.h>
 230
 231#endif /* NO_MMAP || USE_WIN32_MMAP */
 232
 233#ifdef NO_MMAP
 234
 235/* This value must be multiple of (pagesize * 2) */
 236#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 237
 238#else /* NO_MMAP */
 239
 240/* This value must be multiple of (pagesize * 2) */
 241#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 242        (sizeof(void*) >= 8 \
 243                ?  1 * 1024 * 1024 * 1024 \
 244                : 32 * 1024 * 1024)
 245
 246#endif /* NO_MMAP */
 247
 248#ifndef MAP_FAILED
 249#define MAP_FAILED ((void *)-1)
 250#endif
 251
 252#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 253#define on_disk_bytes(st) ((st).st_size)
 254#else
 255#define on_disk_bytes(st) ((st).st_blocks * 512)
 256#endif
 257
 258#define DEFAULT_PACKED_GIT_LIMIT \
 259        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 260
 261#ifdef NO_PREAD
 262#define pread git_pread
 263extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 264#endif
 265/*
 266 * Forward decl that will remind us if its twin in cache.h changes.
 267 * This function is used in compat/pread.c.  But we can't include
 268 * cache.h there.
 269 */
 270extern ssize_t read_in_full(int fd, void *buf, size_t count);
 271
 272#ifdef NO_SETENV
 273#define setenv gitsetenv
 274extern int gitsetenv(const char *, const char *, int);
 275#endif
 276
 277#ifdef NO_MKDTEMP
 278#define mkdtemp gitmkdtemp
 279extern char *gitmkdtemp(char *);
 280#endif
 281
 282#ifdef NO_MKSTEMPS
 283#define mkstemps gitmkstemps
 284extern int gitmkstemps(char *, int);
 285#endif
 286
 287#ifdef NO_UNSETENV
 288#define unsetenv gitunsetenv
 289extern void gitunsetenv(const char *);
 290#endif
 291
 292#ifdef NO_STRCASESTR
 293#define strcasestr gitstrcasestr
 294extern char *gitstrcasestr(const char *haystack, const char *needle);
 295#endif
 296
 297#ifdef NO_STRLCPY
 298#define strlcpy gitstrlcpy
 299extern size_t gitstrlcpy(char *, const char *, size_t);
 300#endif
 301
 302#ifdef NO_STRTOUMAX
 303#define strtoumax gitstrtoumax
 304extern uintmax_t gitstrtoumax(const char *, char **, int);
 305#endif
 306
 307#ifdef NO_HSTRERROR
 308#define hstrerror githstrerror
 309extern const char *githstrerror(int herror);
 310#endif
 311
 312#ifdef NO_MEMMEM
 313#define memmem gitmemmem
 314void *gitmemmem(const void *haystack, size_t haystacklen,
 315                const void *needle, size_t needlelen);
 316#endif
 317
 318#ifdef FREAD_READS_DIRECTORIES
 319#ifdef fopen
 320#undef fopen
 321#endif
 322#define fopen(a,b) git_fopen(a,b)
 323extern FILE *git_fopen(const char*, const char*);
 324#endif
 325
 326#ifdef SNPRINTF_RETURNS_BOGUS
 327#define snprintf git_snprintf
 328extern int git_snprintf(char *str, size_t maxsize,
 329                        const char *format, ...);
 330#define vsnprintf git_vsnprintf
 331extern int git_vsnprintf(char *str, size_t maxsize,
 332                         const char *format, va_list ap);
 333#endif
 334
 335#ifdef __GLIBC_PREREQ
 336#if __GLIBC_PREREQ(2, 1)
 337#define HAVE_STRCHRNUL
 338#define HAVE_MEMPCPY
 339#endif
 340#endif
 341
 342#ifndef HAVE_STRCHRNUL
 343#define strchrnul gitstrchrnul
 344static inline char *gitstrchrnul(const char *s, int c)
 345{
 346        while (*s && *s != c)
 347                s++;
 348        return (char *)s;
 349}
 350#endif
 351
 352#ifndef HAVE_MEMPCPY
 353#define mempcpy gitmempcpy
 354static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 355{
 356        return (char *)memcpy(dest, src, n) + n;
 357}
 358#endif
 359
 360extern void release_pack_memory(size_t, int);
 361
 362extern char *xstrdup(const char *str);
 363extern void *xmalloc(size_t size);
 364extern void *xmallocz(size_t size);
 365extern void *xmemdupz(const void *data, size_t len);
 366extern char *xstrndup(const char *str, size_t len);
 367extern void *xrealloc(void *ptr, size_t size);
 368extern void *xcalloc(size_t nmemb, size_t size);
 369extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 370extern ssize_t xread(int fd, void *buf, size_t len);
 371extern ssize_t xwrite(int fd, const void *buf, size_t len);
 372extern int xdup(int fd);
 373extern FILE *xfdopen(int fd, const char *mode);
 374extern int xmkstemp(char *template);
 375extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 376extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 377
 378static inline size_t xsize_t(off_t len)
 379{
 380        return (size_t)len;
 381}
 382
 383static inline int has_extension(const char *filename, const char *ext)
 384{
 385        size_t len = strlen(filename);
 386        size_t extlen = strlen(ext);
 387        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 388}
 389
 390/* Sane ctype - no locale, and works with signed chars */
 391#undef isascii
 392#undef isspace
 393#undef isdigit
 394#undef isalpha
 395#undef isalnum
 396#undef tolower
 397#undef toupper
 398extern unsigned char sane_ctype[256];
 399#define GIT_SPACE 0x01
 400#define GIT_DIGIT 0x02
 401#define GIT_ALPHA 0x04
 402#define GIT_GLOB_SPECIAL 0x08
 403#define GIT_REGEX_SPECIAL 0x10
 404#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 405#define isascii(x) (((x) & ~0x7f) == 0)
 406#define isspace(x) sane_istest(x,GIT_SPACE)
 407#define isdigit(x) sane_istest(x,GIT_DIGIT)
 408#define isalpha(x) sane_istest(x,GIT_ALPHA)
 409#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 410#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 411#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 412#define tolower(x) sane_case((unsigned char)(x), 0x20)
 413#define toupper(x) sane_case((unsigned char)(x), 0)
 414
 415static inline int sane_case(int x, int high)
 416{
 417        if (sane_istest(x, GIT_ALPHA))
 418                x = (x & ~0x20) | high;
 419        return x;
 420}
 421
 422static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 423{
 424        unsigned long ul;
 425        char *p;
 426
 427        errno = 0;
 428        ul = strtoul(s, &p, base);
 429        if (errno || *p || p == s || (unsigned int) ul != ul)
 430                return -1;
 431        *result = ul;
 432        return 0;
 433}
 434
 435static inline int strtol_i(char const *s, int base, int *result)
 436{
 437        long ul;
 438        char *p;
 439
 440        errno = 0;
 441        ul = strtol(s, &p, base);
 442        if (errno || *p || p == s || (int) ul != ul)
 443                return -1;
 444        *result = ul;
 445        return 0;
 446}
 447
 448#ifdef INTERNAL_QSORT
 449void git_qsort(void *base, size_t nmemb, size_t size,
 450               int(*compar)(const void *, const void *));
 451#define qsort git_qsort
 452#endif
 453
 454#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 455# define FORCE_DIR_SET_GID S_ISGID
 456#else
 457# define FORCE_DIR_SET_GID 0
 458#endif
 459
 460#ifdef NO_NSEC
 461#undef USE_NSEC
 462#define ST_CTIME_NSEC(st) 0
 463#define ST_MTIME_NSEC(st) 0
 464#else
 465#ifdef USE_ST_TIMESPEC
 466#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 467#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 468#else
 469#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 470#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 471#endif
 472#endif
 473
 474#ifdef UNRELIABLE_FSTAT
 475#define fstat_is_reliable() 0
 476#else
 477#define fstat_is_reliable() 1
 478#endif
 479
 480/*
 481 * Preserves errno, prints a message, but gives no warning for ENOENT.
 482 * Always returns the return value of unlink(2).
 483 */
 484int unlink_or_warn(const char *path);
 485
 486#endif