FreeBSD/Linux Kernel Cross Reference
sys/amd64/include/varargs.h

     /*-
      * Copyright (c) 2002 David E. O'Brien.  All rights reserved.
      * Copyright (c) 1990, 1993
      *      The Regents of the University of California.  All rights reserved.
      * (c) UNIX System Laboratories, Inc.
      * All or some portions of this file are derived from material licensed
      * to the University of California by American Telephone and Telegraph
      * Co. or Unix System Laboratories, Inc. and are reproduced herein with
      * the permission of UNIX System Laboratories, Inc.
     *
     * 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.
     *
     *      @(#)varargs.h   8.2 (Berkeley) 3/22/94
     * $FreeBSD: releng/9.0/sys/amd64/include/varargs.h 143434 2005-03-11 22:16:09Z peter $
     */
    
    #ifndef _MACHINE_VARARGS_H_
    #define _MACHINE_VARARGS_H_
    
    #ifndef _SYS_CDEFS_H_
    #error this file needs sys/cdefs.h as a prerequisite
    #endif
    
    #ifdef __GNUCLIKE_BUILTIN_VARARGS
    
    #include <sys/_types.h>
    
    #ifndef _VA_LIST_DECLARED
    #define _VA_LIST_DECLARED
    typedef __va_list       va_list;
    #endif
    
    typedef int __builtin_va_alist_t __attribute__((__mode__(__word__)));
    
    #define va_alist                __builtin_va_alist
    #define va_dcl                  __builtin_va_alist_t __builtin_va_alist; ...
    #define va_start(ap)            __builtin_varargs_start(ap)
    #define va_arg(ap, type)        __builtin_va_arg((ap), type)
    #define va_end(ap)              __builtin_va_end(ap)
    
    #else   /* !__GNUCLIKE_BUILTIN_VARARGS */
    
    typedef char *va_list;
    
    #define __va_size(type) \
            (((sizeof(type) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))
    
    #if defined(__GNUCLIKE_BUILTIN_VAALIST)
    #define va_alist        __builtin_va_alist
    #endif
    #define va_dcl  int va_alist; ...
    
    #define va_start(ap) \
            ((ap) = (va_list)&va_alist)
    
    #define va_arg(ap, type) \
            (*(type *)((ap) += __va_size(type), (ap) - __va_size(type)))
    
    #define va_end(ap)
    
    #endif /* __GNUCLIKE_BUILTIN_VARARGS */
    
    #endif /* !_MACHINE_VARARGS_H_ */

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