compat.h

   1 #ifndef INCLUDE_compat_h__
   2 #define INCLUDE_compat_h__
   3
   4 /*
   5  * CHAR_BIT really should be 8 on all systems we care about
   6  */
   7 #ifndef CHAR_BIT
   8 # define CHAR_BIT 8
   9 #endif
  10
  11 #ifdef __WORDSIZE
  12 # define COMPAT_WORDSIZE __WORDSIZE
  13 #else
  14 # define COMPAT_WORDSIZE (sizeof(void *) * CHAR_BIT)
  15 #endif
  16
  17 /* runtime detection of endianness with GNU style macros */
  18 #define COMPAT_LITTLE_ENDIAN 1234
  19 #define COMPAT_BIG_ENDIAN    4321
  20
  21 static inline unsigned int endianness(void)
  22 {
  23         int i = 1;
  24
  25 #ifdef __BYTE_ORDER
  26         if (__BYTE_ORDER == COMPAT_LITTLE_ENDIAN || __BYTE_ORDER == COMPAT_BIG_ENDIAN)
  27                 return __BYTE_ORDER;
  28 #elif defined(_BYTE_ORDER)
  29         if (_BYTE_ORDER == COMPAT_LITTLE_ENDIAN || _BYTE_ORDER == COMPAT_BIG_ENDIAN)
  30                 return _BYTE_ORDER;
  31 #endif /* __BYTE_ORDER */
  32
  33         if (((char *)&i)[0] == 1)
  34                 return COMPAT_LITTLE_ENDIAN;
  35
  36         return COMPAT_BIG_ENDIAN;
  37 }
  38
  39 #ifdef NEEDS_MEMRCHR
  40 extern void *memrchr(const void *s, int c, size_t n);
  41 #endif
  42
  43 #ifdef NEEDS_ASPRINTF
  44 #include <stdarg.h>
  45 extern int asprintf(char **strp, const char *fmt, ...);
  46 extern int vasprintf(char **strp, const char *fmt, va_list ap);
  47 #endif
  48
  49 #ifndef NEBATTR_CHECK_ALERT
  50 # define NEBATTR_CHECK_ALERT 1
  51 #endif
  52
  53 #endif /* INCLUDE_compat_h__ */