stdarg.h

一个操作系统的源代码

/** io.h
 **
 ** Original Author: Kasper Verdich Lund
 ** Date: 10/11/99
 **
 ** Description:
 ** Standard arguments
 **
 ** This program is free software, you can redistribute it and/or
 ** modify it under the terms of the GNU General Public License
 ** as published by the Free Software Foundation; either version
 ** 2 of the License, or (at your option) any later version.
 **
 ** This program is distributed in the hope that it will be
 ** useful, but WITHOUT ANY WARRANTY; without even the implied
 ** warranty or MERCHANTABILITY or FITNESS FOR A PARTICULAR
 ** PURPOSE.  See the GNU General Public License for more
 ** details.
 **
 ** You should have received a copy of the GNU General Public
 ** License along with this program; if not, write to the
 ** Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 ** Boston, MA 02111-1307 USA
 **
 *********************************************************Apostle OS**/

#ifndef __STDARG_H_
#define __STDARG_H_

typedef char *va_list[1];

#define va_start(ap,pn) ((ap)[0]=(char *)&pn+((sizeof(pn)+sizeof(int)-1)&~(sizeof(int)-1)),(void)0)
#define va_arg(ap,type) ((ap)[0]+=((sizeof(type)+sizeof(int)-1)&~(sizeof(int)-1)),(*(type *)((ap)[0]-((sizeof(type)+sizeof(int)-1)&~(sizeof(int)-1)))))
#define va_end(ap) ((ap)[0]=0,(void)0)

#endif /* __STDARG_H_ */