include/stddef.h

   1 #ifndef _STDDEF_H
   2 #define _STDDEF_H
   3
   4 #ifdef __cplusplus
   5 #define NULL 0L
   6 #else
   7 #define NULL ((void*)0)
   8 #endif
   9
  10 #define __NEED_ptrdiff_t
  11 #define __NEED_size_t
  12 #define __NEED_wchar_t
  13 #if __STDC_VERSION__ >= 201112L || __cplusplus >= 201103L
  14 #define __NEED_max_align_t
  15 #endif
  16
  17 #include <bits/alltypes.h>
  18
  19 #if __GNUC__ > 3
  20 #define offsetof(type, member) __builtin_offsetof(type, member)
  21 #else
  22 #define offsetof(type, member) ((size_t)( (char *)&(((type *)0)->member) - (char *)0 ))
  23 #endif
  24
  25 #endif