git-compat-util.h

   1 #ifndef GIT_COMPAT_UTIL_H
   2 #define GIT_COMPAT_UTIL_H
   3
   4 #ifndef FLEX_ARRAY
   5 /*
   6  * See if our compiler is known to support flexible array members.
   7  */
   8 #if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)
   9 # define FLEX_ARRAY /* empty */
  10 #elif defined(__GNUC__)
  11 # if (__GNUC__ >= 3)
  12 #  define FLEX_ARRAY /* empty */
  13 # else
  14 #  define FLEX_ARRAY 0 /* older GNU extension */
  15 # endif
  16 #elif defined(_MSC_VER)
  17 #define FLEX_ARRAY /* empty */
  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
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <fcntl.h>
  34 #include <stdarg.h>
  35 #include <errno.h>
  36 #include <limits.h>
  37 #include <time.h>
  38 #include <io.h>
  39 #include <sys/stat.h>
  40 #include <sys/utime.h>
  41 #include <signal.h>
  42 #include <process.h>
  43
  44 #if defined(_MSC_VER)
  45 /* MSVC defines mkdir here, not in io.h */
  46 #include <direct.h>
  47 #endif
  48
  49 #ifndef PATH_MAX
  50 /*
  51  * with MSVC, if we define _POSIX_ we loose half of useful functions
  52  * (e.g. chmod, open, close), otherwise we don't have PATH_MAX
  53  * because of #ifdef in <io.h>.
  54  * So, when build under MSVC, don't define _POSIX_
  55  */
  56 #define PATH_MAX            512
  57 #endif
  58
  59 /* from mingw/include/sys/types.h */
  60 #ifndef _SSIZE_T_
  61 #define _SSIZE_T_
  62 typedef long _ssize_t;
  63
  64 #ifndef _NO_OLDNAMES
  65 typedef _ssize_t ssize_t;
  66 #endif
  67 #endif /* Not _SSIZE_T_ */
  68
  69 #ifndef _MODE_T_
  70 #define _MODE_T_
  71 typedef unsigned short _mode_t;
  72
  73 #ifndef _NO_OLDNAMES
  74 typedef _mode_t mode_t;
  75 #endif
  76 #endif  /* Not _MODE_T_ */
  77
  78
  79 /* from mingw/include/io.h */
  80 /* Some defines for _access nAccessMode (MS doesn't define them, but
  81  * it doesn't seem to hurt to add them). */
  82 #define F_OK    0       /* Check for file existence */
  83 /* Well maybe it does hurt.  On newer versions of MSVCRT, an access mode
  84    of 1 causes invalid parameter error. */
  85 #define X_OK    1       /* MS access() doesn't check for execute permission. */
  86 #define W_OK    2       /* Check for write permission */
  87 #define R_OK    4       /* Check for read permission */
  88
  89 /* from mingw/include/string.h */
  90 #define strcasecmp(__sz1, __sz2) (_stricmp((__sz1), (__sz2)))
  91
  92 /* from mingw/include/stdint.h */
  93 typedef unsigned   uint32_t;
  94
  95 #ifdef __GNUC__
  96 #define NORETURN __attribute__((__noreturn__))
  97 #else
  98
  99 #if defined(_MSC_VER)
 100 #define NORETURN __declspec(noreturn)
 101 #else
 102 #define NORETURN
 103 #endif /* _MSC_VER */
 104
 105 #ifndef __attribute__
 106 #define __attribute__(x)
 107 #endif
 108 #define __CRT_INLINE
 109 #endif
 110
 111 extern int error(const char * format, ...);
 112 extern NORETURN void die(const char *err, ...) __attribute__((format (printf, 1, 2)));
 113
 114 #ifndef HAVE_STRCHRNUL
 115 #define strchrnul gitstrchrnul
 116 static inline char *gitstrchrnul(const char *s, int c)
 117 {
 118         while (*s && *s != c)
 119                 s++;
 120         return (char *)s;
 121 }
 122 #endif
 123
 124 extern time_t tm_to_time_t(const struct tm *tm);
 125
 126 extern void release_pack_memory(size_t, int);
 127
 128 extern char *xstrdup(const char *str);
 129 extern void *xmalloc(size_t size);
 130 extern void *xrealloc(void *ptr, size_t size);
 131 extern void *xcalloc(size_t nmemb, size_t size);
 132 extern ssize_t xread(int fd, void *buf, size_t len);
 133
 134 #ifdef NO_STRLCPY
 135 #define strlcpy gitstrlcpy
 136 extern size_t gitstrlcpy(char *, const char *, size_t);
 137 #endif
 138
 139 #define snprintf _snprintf
 140
 141 #ifdef NO_MMAP
 142
 143 #ifndef PROT_READ
 144 #define PROT_READ 1
 145 #define PROT_WRITE 2
 146 #define MAP_PRIVATE 1
 147 #define MAP_FAILED ((void*)-1)
 148 #endif
 149
 150 #define mmap git_mmap
 151 #define munmap git_munmap
 152 extern void *git_mmap(void *start, size_t length, int prot, int flags, int fd, off_t offset);
 153 extern int git_munmap(void *start, size_t length);
 154
 155 /* This value must be multiple of (pagesize * 2) */
 156 #define DEFAULT_PACKED_GIT_WINDOW_SIZE (1 * 1024 * 1024)
 157
 158 #else /* NO_MMAP */
 159
 160 #include <sys/mman.h>
 161
 162 /* This value must be multiple of (pagesize * 2) */
 163 #define DEFAULT_PACKED_GIT_WINDOW_SIZE \
 164         (sizeof(void*) >= 8 \
 165                 ?  1 * 1024 * 1024 * 1024 \
 166                 : 32 * 1024 * 1024)
 167
 168 #endif /* NO_MMAP */
 169
 170 #ifdef NO_PREAD
 171 #define pread git_pread
 172 extern ssize_t git_pread(int fd, void *buf, size_t count, off_t offset);
 173 #endif
 174 /*
 175  * Forward decl that will remind us if its twin in cache.h changes.
 176  * This function is used in compat/pread.c.  But we can't include
 177  * cache.h there.
 178  */
 179 extern ssize_t read_in_full(int fd, void *buf, size_t count);
 180
 181 #include "compat/mingw.h"
 182
 183 #endif