stddef.h

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#ifndef STDDEF_H
#define STDDEF_H
 
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
FILE_SECBOOT ( PERMITTED );
 
#include <stdint.h>
 
/** EFI headers also define NULL */
#undef NULL
 
/** Null pointer */
#define NULL ( ( void * ) 0 )
 
/**
 * Get offset of a field within a structure
 *
 * @v type              Structure type
 * @v field             Field within structure
 * @ret offset          Offset within structure
 */
#if defined ( __GNUC__ ) && ( __GNUC__ > 3 )
#define offsetof( type, field ) __builtin_offsetof ( type, field )
#else
#define offsetof( type, field ) ( ( size_t ) &( ( ( type * ) NULL )->field ) )
#endif
 
/**
 * Get containing structure
 *
 * @v ptr               Pointer to contained field
 * @v type              Containing structure type
 * @v field             Field within containing structure
 * @ret container       Pointer to containing structure
 */
#define container_of( ptr, type, field ) ( {                            \
        type *__container;                                              \
        const volatile typeof ( __container->field ) *__field = (ptr);  \
        __container = ( ( ( void * ) __field ) -                        \
                        offsetof ( type, field ) );                     \
        __container; } )
 
/* __WCHAR_TYPE__ is defined by gcc and will change if -fshort-wchar is used */
#ifndef __WCHAR_TYPE__
#define __WCHAR_TYPE__ uint16_t
#endif
#ifndef __WINT_TYPE__
#define __WINT_TYPE__ int
#endif
typedef __WCHAR_TYPE__ wchar_t;
typedef __WINT_TYPE__ wint_t;
 
#endif /* STDDEF_H */