com32/include/stddef.h

   1 /*
   2  * stddef.h
   3  */
   4
   5 #ifndef _STDDEF_H
   6 #define _STDDEF_H
   7
   8 #ifndef __KLIBC__
   9 # define __KLIBC__ 1
  10 #endif
  11
  12 #include <bitsize/stddef.h>
  13
  14 #undef NULL
  15 #ifdef __cplusplus
  16 # define NULL 0
  17 #else
  18 # define NULL ((void *)0)
  19 #endif
  20
  21 #undef offsetof
  22 #define offsetof(t,m) ((size_t)&((t *)0)->m)
  23
  24 #undef container_of
  25 /*
  26  * The container_of construct: if p is a pointer to member m of
  27  * container class c, then return a pointer to the container of which
  28  * *p is a member.
  29  */
  30 #define container_of(p, c, m) ((c *)((char *)(p) - offsetof(c,m)))
  31
  32 #endif /* _STDDEF_H */