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#define MAP_FAILED ((void*)-1)
 221#endif
 222
 223#define mmap git_mmap
 224#define munmap git_munmap
 225extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 226extern int git_munmap(void *start, size_t length);
 227
 228#else /* NO_MMAP || USE_WIN32_MMAP */
 229
 230#include <sys/mman.h>
 231
 232#endif /* NO_MMAP || USE_WIN32_MMAP */
 233
 234#ifdef NO_MMAP
 235
 236/* This value must be multiple of (pagesize * 2) */
 237#define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 238
 239#else /* NO_MMAP */
 240
 241/* This value must be multiple of (pagesize * 2) */
 242#define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 243        (sizeof(void*) >= 8 \
 244                ?  1 * 1024 * 1024 * 1024 \
 245                : 32 * 1024 * 1024)
 246
 247#endif /* NO_MMAP */
 248
 249#ifdef NO_ST_BLOCKS_IN_STRUCT_STAT
 250#define on_disk_bytes(st) ((st).st_size)
 251#else
 252#define on_disk_bytes(st) ((st).st_blocks * 512)
 253#endif
 254
 255#define DEFAULT_PACKED_GIT_LIMIT \
 256        ((1024L * 1024L) * (sizeof(void*) >= 8 ? 8192 : 256))
 257
 258#ifdef NO_PREAD
 259#define pread git_pread
 260extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 261#endif
 262/*
 263 * Forward decl that will remind us if its twin in cache.h changes.
 264 * This function is used in compat/pread.c.  But we can't include
 265 * cache.h there.
 266 */
 267extern ssize_t read_in_full(int fd, void *buf, size_t count);
 268
 269#ifdef NO_SETENV
 270#define setenv gitsetenv
 271extern int gitsetenv(const char *, const char *, int);
 272#endif
 273
 274#ifdef NO_MKDTEMP
 275#define mkdtemp gitmkdtemp
 276extern char *gitmkdtemp(char *);
 277#endif
 278
 279#ifdef NO_MKSTEMPS
 280#define mkstemps gitmkstemps
 281extern int gitmkstemps(char *, int);
 282#endif
 283
 284#ifdef NO_UNSETENV
 285#define unsetenv gitunsetenv
 286extern void gitunsetenv(const char *);
 287#endif
 288
 289#ifdef NO_STRCASESTR
 290#define strcasestr gitstrcasestr
 291extern char *gitstrcasestr(const char *haystack, const char *needle);
 292#endif
 293
 294#ifdef NO_STRLCPY
 295#define strlcpy gitstrlcpy
 296extern size_t gitstrlcpy(char *, const char *, size_t);
 297#endif
 298
 299#ifdef NO_STRTOUMAX
 300#define strtoumax gitstrtoumax
 301extern uintmax_t gitstrtoumax(const char *, char **, int);
 302#endif
 303
 304#ifdef NO_HSTRERROR
 305#define hstrerror githstrerror
 306extern const char *githstrerror(int herror);
 307#endif
 308
 309#ifdef NO_MEMMEM
 310#define memmem gitmemmem
 311void *gitmemmem(const void *haystack, size_t haystacklen,
 312                const void *needle, size_t needlelen);
 313#endif
 314
 315#ifdef FREAD_READS_DIRECTORIES
 316#ifdef fopen
 317#undef fopen
 318#endif
 319#define fopen(a,b) git_fopen(a,b)
 320extern FILE *git_fopen(const char*, const char*);
 321#endif
 322
 323#ifdef SNPRINTF_RETURNS_BOGUS
 324#define snprintf git_snprintf
 325extern int git_snprintf(char *str, size_t maxsize,
 326                        const char *format, ...);
 327#define vsnprintf git_vsnprintf
 328extern int git_vsnprintf(char *str, size_t maxsize,
 329                         const char *format, va_list ap);
 330#endif
 331
 332#ifdef __GLIBC_PREREQ
 333#if __GLIBC_PREREQ(2, 1)
 334#define HAVE_STRCHRNUL
 335#define HAVE_MEMPCPY
 336#endif
 337#endif
 338
 339#ifndef HAVE_STRCHRNUL
 340#define strchrnul gitstrchrnul
 341static inline char *gitstrchrnul(const char *s, int c)
 342{
 343        while (*s && *s != c)
 344                s++;
 345        return (char *)s;
 346}
 347#endif
 348
 349#ifndef HAVE_MEMPCPY
 350#define mempcpy gitmempcpy
 351static inline void *gitmempcpy(void *dest, const void *src, size_t n)
 352{
 353        return (char *)memcpy(dest, src, n) + n;
 354}
 355#endif
 356
 357extern void release_pack_memory(size_t, int);
 358
 359extern char *xstrdup(const char *str);
 360extern void *xmalloc(size_t size);
 361extern void *xmallocz(size_t size);
 362extern void *xmemdupz(const void *data, size_t len);
 363extern char *xstrndup(const char *str, size_t len);
 364extern void *xrealloc(void *ptr, size_t size);
 365extern void *xcalloc(size_t nmemb, size_t size);
 366extern void *xmmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 367extern ssize_t xread(int fd, void *buf, size_t len);
 368extern ssize_t xwrite(int fd, const void *buf, size_t len);
 369extern int xdup(int fd);
 370extern FILE *xfdopen(int fd, const char *mode);
 371extern int xmkstemp(char *template);
 372extern int odb_mkstemp(char *template, size_t limit, const char *pattern);
 373extern int odb_pack_keep(char *name, size_t namesz, unsigned char *sha1);
 374
 375static inline size_t xsize_t(off_t len)
 376{
 377        return (size_t)len;
 378}
 379
 380static inline int has_extension(const char *filename, const char *ext)
 381{
 382        size_t len = strlen(filename);
 383        size_t extlen = strlen(ext);
 384        return len > extlen && !memcmp(filename + len - extlen, ext, extlen);
 385}
 386
 387/* Sane ctype - no locale, and works with signed chars */
 388#undef isascii
 389#undef isspace
 390#undef isdigit
 391#undef isalpha
 392#undef isalnum
 393#undef tolower
 394#undef toupper
 395extern unsigned char sane_ctype[256];
 396#define GIT_SPACE 0x01
 397#define GIT_DIGIT 0x02
 398#define GIT_ALPHA 0x04
 399#define GIT_GLOB_SPECIAL 0x08
 400#define GIT_REGEX_SPECIAL 0x10
 401#define sane_istest(x,mask) ((sane_ctype[(unsigned char)(x)] & (mask)) != 0)
 402#define isascii(x) (((x) & ~0x7f) == 0)
 403#define isspace(x) sane_istest(x,GIT_SPACE)
 404#define isdigit(x) sane_istest(x,GIT_DIGIT)
 405#define isalpha(x) sane_istest(x,GIT_ALPHA)
 406#define isalnum(x) sane_istest(x,GIT_ALPHA | GIT_DIGIT)
 407#define is_glob_special(x) sane_istest(x,GIT_GLOB_SPECIAL)
 408#define is_regex_special(x) sane_istest(x,GIT_GLOB_SPECIAL | GIT_REGEX_SPECIAL)
 409#define tolower(x) sane_case((unsigned char)(x), 0x20)
 410#define toupper(x) sane_case((unsigned char)(x), 0)
 411
 412static inline int sane_case(int x, int high)
 413{
 414        if (sane_istest(x, GIT_ALPHA))
 415                x = (x & ~0x20) | high;
 416        return x;
 417}
 418
 419static inline int strtoul_ui(char const *s, int base, unsigned int *result)
 420{
 421        unsigned long ul;
 422        char *p;
 423
 424        errno = 0;
 425        ul = strtoul(s, &p, base);
 426        if (errno || *p || p == s || (unsigned int) ul != ul)
 427                return -1;
 428        *result = ul;
 429        return 0;
 430}
 431
 432static inline int strtol_i(char const *s, int base, int *result)
 433{
 434        long ul;
 435        char *p;
 436
 437        errno = 0;
 438        ul = strtol(s, &p, base);
 439        if (errno || *p || p == s || (int) ul != ul)
 440                return -1;
 441        *result = ul;
 442        return 0;
 443}
 444
 445#ifdef INTERNAL_QSORT
 446void git_qsort(void *base, size_t nmemb, size_t size,
 447               int(*compar)(const void *, const void *));
 448#define qsort git_qsort
 449#endif
 450
 451#ifndef DIR_HAS_BSD_GROUP_SEMANTICS
 452# define FORCE_DIR_SET_GID S_ISGID
 453#else
 454# define FORCE_DIR_SET_GID 0
 455#endif
 456
 457#ifdef NO_NSEC
 458#undef USE_NSEC
 459#define ST_CTIME_NSEC(st) 0
 460#define ST_MTIME_NSEC(st) 0
 461#else
 462#ifdef USE_ST_TIMESPEC
 463#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctimespec.tv_nsec))
 464#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtimespec.tv_nsec))
 465#else
 466#define ST_CTIME_NSEC(st) ((unsigned int)((st).st_ctim.tv_nsec))
 467#define ST_MTIME_NSEC(st) ((unsigned int)((st).st_mtim.tv_nsec))
 468#endif
 469#endif
 470
 471#ifdef UNRELIABLE_FSTAT
 472#define fstat_is_reliable() 0
 473#else
 474#define fstat_is_reliable() 1
 475#endif
 476
 477/*
 478 * Preserves errno, prints a message, but gives no warning for ENOENT.
 479 * Always returns the return value of unlink(2).
 480 */
 481int unlink_or_warn(const char *path);
 482
 483#endif