stdarg.h

FritzOS - 简单的C++开发OS的实例// 英文

/* stdarg.h : FritzOS Sandard Args Header File For The FritzOS C++ Kernel
   Copyright (C) 2002 Tom Fritz

 * This program is a part of the FritzOS kernel, and may be freely
 * copied under the terms of the GNU General Public License (GPL),
 * version 2, or at your option any later version.

   For more info, look at the COPYING file.
*/

// defines:

#ifndef STDARG_H
#define STDARG_H

// These are the #defines for function arguments ( the type with the ... operator ).
// These are used to get the values in the '...''s

// if your wondering where LASTARG is defined, I think the compile does it.
#define	va_start( AP, LASTARG )	\
	( AP = ( ( va_list ) & ( LASTARG ) + VA_SIZE( LASTARG ) ) )

// same with TYPE
#define va_arg( AP, TYPE )						\
 ( AP += __va_rounded_size ( TYPE ),					\
  * ( ( TYPE * ) ( AP - __va_rounded_size ( TYPE ) ) ) )

#define __va_rounded_size( TYPE )  \
  ( ( ( sizeof ( TYPE ) + sizeof ( int ) - 1 ) / sizeof ( int ) ) * sizeof ( int ) )

#define	VA_SIZE( TYPE )					\
	( ( sizeof( TYPE ) + sizeof( STACKITEM ) - 1 )	\
		& ~( sizeof( STACKITEM ) - 1 ) )

// StackItem is defined here:
#define	STACKITEM	int

#define va_end(AP)	

// typedefs:
typedef unsigned char *va_list;

#endif

// End of stdarg.h