wimboot/wimboot-2.7.3/src/stddef.h

   1 #ifndef _STDDEF_H
   2 #define _STDDEF_H
   3
   4 /*
   5  * Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  20  * 02110-1301, USA.
  21  */
  22
  23 /**
  24  * @file
  25  *
  26  * Standard definitions
  27  *
  28  */
  29
  30 #include <stdint.h>
  31
  32 #define NULL ( ( void * ) 0 )
  33
  34 #define offsetof( type, member ) ( ( size_t ) &( ( type * ) NULL )->member )
  35
  36 #define container_of( ptr, type, member ) ( {                           \
  37         const typeof ( ( ( type * ) NULL )->member ) *__mptr = (ptr);   \
  38         ( type * ) ( ( void * ) __mptr - offsetof ( type, member ) ); } )
  39
  40 #endif /* _STDDEF_H */