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

     /*      $OpenBSD: varargs.h,v 1.4 2020/07/21 23:09:00 daniel Exp $ */
     /*
      * Copyright (c) 2003, 2004  Marc espie <espie@openbsd.org>
      *
      * Permission to use, copy, modify, and distribute this software for any
      * purpose with or without fee is hereby granted, provided that the above
      * copyright notice and this permission notice appear in all copies.
      *
      * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
     * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
     * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
     * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
     * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
     * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
     * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
     */
    
    #ifndef _VARARGS_H_
    #define _VARARGS_H_
    
    /* These macros implement traditional (non-ANSI) varargs
       for GNU C.  */
    
    #define va_alist  __builtin_va_alist
    
    #define __va_ellipsis   ...
    
    /* ??? We don't process attributes correctly in K&R argument context.  */
    typedef int __builtin_va_alist_t __attribute__((__mode__(__word__)));
    
    /* ??? It would be nice to get rid of the ellipsis here.  It causes
       current_function_varargs to be set in cc1.  */
    #define va_dcl          __builtin_va_alist_t __builtin_va_alist; ...
    
    /* Define __gnuc_va_list, just as in stdarg.h.  */
    
    #ifndef __GNUC_VA_LIST
    #define __GNUC_VA_LIST
    typedef __builtin_va_list __gnuc_va_list;
    #endif
    
    #define va_start(v)     __builtin_varargs_start((v))
    #define va_end          __builtin_va_end
    #define va_arg          __builtin_va_arg
    #define __va_copy(d,s)  __builtin_va_copy((d),(s))
    
    /* Define va_list from __gnuc_va_list.  */
    
    typedef __gnuc_va_list va_list;
    
    #endif /* _VARARGS_H_ */

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