stdarg.h

来自「基于组件方式开发操作系统的OSKIT源代码」· C头文件 代码 · 共 64 行

/*-
 * Copyright (c) 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)stdarg.h	8.1 (Berkeley) 6/10/93
 */

#ifndef _STDARG_H_
#define	_STDARG_H_

typedef char *va_list;

#ifdef __GNUC__
#define va_start(AP, LASTARG) 						\
 (AP = ((va_list) __builtin_next_arg (LASTARG)))
#else
#define	__va_promote(type) \
	(((sizeof(type) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))

#define	va_start(ap, last) \
	(ap = ((va_list)&(last) + __va_promote(last)))
#endif

#ifdef KERNEL
#define	va_arg(ap, type) \
	((type *)(ap += sizeof(type)))[-1]
#else
#define	va_arg(ap, type) \
	((type *)(ap += sizeof(type) < sizeof(int) ? \
		(abort(), 0) : sizeof(type)))[-1]
#endif

#define	va_end(ap)

#endif /* !_STDARG_H_ */