usr/src/include/stdarg.h

/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted provided
 * that: (1) source distributions retain this entire copyright notice and
 * comment, and (2) distributions including binaries display the following
 * acknowledgement:  ``This product includes software developed by the
 * University of California, Berkeley and its contributors'' in the
 * documentation or other materials provided with the distribution and in
 * all advertising materials mentioning features or use of this software.
 * 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 *      @(#)stdarg.h    5.4 (Berkeley) 6/26/90
 */

typedef char *va_list;

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

#define va_end(ap)

#define __va_promote(type) \
        (((sizeof(type) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))

#define va_start(ap, last) \
        (ap = ((char *)&(last) + __va_promote(last)))