The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/include/varargs.h

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    1 /*-
    2  * Copyright (c) 2002 David E. O'Brien.  All rights reserved.
    3  * Copyright (c) 1990, 1993
    4  *      The Regents of the University of California.  All rights reserved.
    5  * (c) UNIX System Laboratories, Inc.
    6  * All or some portions of this file are derived from material licensed
    7  * to the University of California by American Telephone and Telegraph
    8  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    9  * the permission of UNIX System Laboratories, Inc.
   10  *
   11  * Redistribution and use in source and binary forms, with or without
   12  * modification, are permitted provided that the following conditions
   13  * are met:
   14  * 1. Redistributions of source code must retain the above copyright
   15  *    notice, this list of conditions and the following disclaimer.
   16  * 2. Redistributions in binary form must reproduce the above copyright
   17  *    notice, this list of conditions and the following disclaimer in the
   18  *    documentation and/or other materials provided with the distribution.
   19  * 4. Neither the name of the University nor the names of its contributors
   20  *    may be used to endorse or promote products derived from this software
   21  *    without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   33  * SUCH DAMAGE.
   34  *
   35  *      @(#)varargs.h   8.2 (Berkeley) 3/22/94
   36  * $FreeBSD: releng/8.3/sys/i386/include/varargs.h 199583 2009-11-20 15:27:52Z jhb $
   37  */
   38 
   39 #ifndef _MACHINE_VARARGS_H_
   40 #define _MACHINE_VARARGS_H_
   41 
   42 #ifndef _SYS_CDEFS_H_
   43 #error this file needs sys/cdefs.h as a prerequisite
   44 #endif
   45 
   46 #ifdef __GNUCLIKE_BUILTIN_VARARGS
   47 
   48 #include <sys/_types.h>
   49 
   50 #ifndef _VA_LIST_DECLARED
   51 #define _VA_LIST_DECLARED
   52 typedef __va_list       va_list;
   53 #endif
   54 
   55 typedef int __builtin_va_alist_t __attribute__((__mode__(__word__)));
   56 
   57 #define va_alist                __builtin_va_alist
   58 #define va_dcl                  __builtin_va_alist_t __builtin_va_alist; ...
   59 #define va_start(ap)            __builtin_varargs_start(ap)
   60 #define va_arg(ap, type)        __builtin_va_arg((ap), type)
   61 #define va_end(ap)              __builtin_va_end(ap)
   62 
   63 #else   /* !__GNUCLIKE_BUILTIN_VARARGS */
   64 
   65 typedef char *va_list;
   66 
   67 #define __va_size(type) \
   68         (((sizeof(type) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))
   69 
   70 #if defined(__GNUCLIKE_BUILTIN_VAALIST)
   71 #define va_alist        __builtin_va_alist
   72 #endif
   73 #ifdef __CC_SUPPORTS_VARADIC_XXX
   74 #define va_dcl  int va_alist; ...
   75 #else
   76 #define va_dcl  int va_alist; 
   77 #endif
   78 
   79 #define va_start(ap) \
   80         ((ap) = (va_list)&va_alist)
   81 
   82 #define va_arg(ap, type) \
   83         (*(type *)((ap) += __va_size(type), (ap) - __va_size(type)))
   84 
   85 #define va_end(ap)
   86 
   87 #endif /* __GNUCLIKE_BUILTIN_VARARGS */
   88 
   89 #endif /* !_MACHINE_VARARGS_H_ */

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