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[libc] Rewrite unrelicensable portions of stddef.h 

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2015-03-02 14:10:21 +00:00
parent 2f020a8df3
commit 5d1f351278
1 changed files with 29 additions and 11 deletions
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40
src/include/stddef.h
View File

@ -1,25 +1,43 @@
#ifndef STDDEF_H
#define STDDEF_H
FILE_LICENCE ( GPL2_ONLY );
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/* for size_t */
#include <stdint.h>
/** EFI headers also define NULL */
#undef NULL
#define NULL ((void *)0)
#undef offsetof
#if ( defined ( __GNUC__ ) && ( __GNUC__ > 3 ) )
#define offsetof(TYPE, MEMBER) __builtin_offsetof(TYPE, MEMBER)
/** 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, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#define offsetof( type, field ) ( ( size_t ) &( ( ( type * ) NULL )->field ) )
#endif
#undef container_of
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
/**
* 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 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__