.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
.\"
.\" 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.
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.\" 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
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\"
.\"	@(#)stdarg.3	6.8 (Berkeley) 6/29/91
.\"
.\" Converted for Linux, Mon Nov 29 15:11:11 1993, faith@cs.unc.edu
.\" Additions, 2001-10-14, aeb
.\"
.\" Japanese Version Copyright (c) 1998 NAKANO Takeo all rights reserved.
.\" Translated Fri Mar 22 1998 by NAKANO Takeo <nakano@apm.seikei.ac.jp>
.\" Updated Tue Oct 16 2001 by Kentaro Shirakata <argrath@ub32.org>
.\"
.TH STDARG 3  2001-10-14 "" "Linux Programmer's Manual"
.SH ̾
stdarg, va_start, va_arg, va_end, va_copy \- ĿѤʰꥹ
.SH 
.B #include <stdarg.h>
.sp
.BI "void va_start(va_list " ap ", " last );
.br
.IB type " va_arg(va_list " ap ", " type );
.br
.BI "void va_end(va_list " ap );
.br
.BI "void va_copy(va_list " dest ", va_list " src );
.SH 
ؿϸƤӽФ˺ݤơĿ䷿ѤʰȤ뤳ȤǤ롣
󥯥롼ɥե
.I <stdarg.h>
Ǥ
.I va_list
Ƥꡢ3 ĤΥޥƤ롣Ѥȡ
ƤӽФ줿ؿ¦ǤϸĿ䷿ΤʤΥꥹȤ򡢽˰
ĤŤɤ߹ळȤǤ롣
.PP
ƤӽФؿǤϡ
.I va_list
Υ֥ȤƤʤФʤʤΥ֥Ȥ
.BR va_start (),
.BR va_arg (),
.BR va_end ()
γƥޥˤäư롣
.SS va_start()
.BR va_start ()
ޥϺǽ˸ƤӽФʤФʤʤ
.I ap

.BR va_arg ()

.BR va_end ()
Ѥ뤳ȤǤ褦ˤ롣
.PP
ѥ᡼
.I last
ϰꥹȤΤѤʬľ֤ѥ᡼̾Ǥ
롣ĤޤƤӽФ줿ؿΤäƤǸΰǤ롣
.PP
Υѥ᡼ϥ쥸ѿؿȤ
ƤϤʤʤΥѥ᡼Υɥ쥹
.BR va_start ()
ޥѤ뤫⤷ʤǤ롣
.SS va_arg()
.BR va_arg ()
ޥϡƤӽФ˻ꤵ줿Τ
ΰ֤ˤΤꤷ
.I type
ͤȤƼ롣
ѥ᡼
.I ap

.I va_list
.I ap
ǡ
.BR va_start ()
ˤäƽƤɬפ롣
.BR va_arg ()
ƤӽФȤ
.I ap
ѹ졢θƤӽФκݤˡ˼ΰ֤褦ˤʤ롣
ѥ᡼
.I type
Ϸ̾Ǥ롣
.I type
 * դС֥Ȥؤηդݥ󥿤롣
.PP
.BR va_start ()
ޥľ
.BR va_arg ()
ǽ˼¹Ԥȡ
.I last
μΰ֤롣³Ƽ¹ԤȡĤΰ줾֤롣
.PP
ΰʤäꡢ
.I type
ΰμºݤηȸߴǤʤ (ǥեȤΰѴǰ
ʤä) ˤϡͽ¬Ǥʤ顼롣
.PP
.I ap

.BI va_arg( ap , type )
ηǴؿϤȡ
.I ap
ͤϴؿ֤ä褿Ȥʤ롣
.SS va_end()
.BR va_start ()
¹ԤˡƱؿб
.BR va_end ()
¹ԤʤФʤʤ
.BI va_end( ap )
ƤӽФ줿塢ѿ
.I ap
ͤȤʤ롣
.BR va_start ()

.BR va_end ()
Ȥ򲿲¤٤ƻȤȤǽǤ롣
.BR va_end ()
ϥޥ⤷ʤؿ⤷ʤ
.SS va_copy()
ʬ
.I va_list
μϡvariadic ʴؿΥåե졼Υݥ󥿤Ǥ롣
.\"argrath: variadic?
Τ褦ʾ(ۤȤɤϤǤ)
ñ˰ʲΤ褦ˤФ褦˻פ롣
.in +4n
.nf

va_list aq = ap;

.fi
.in
ǰʤ顢(Ĺ 1)ݥ󥿤Ȥưƥ⤢롣
Τ褦ʾ硢ʲΤ褦ˤɬפ롣
.in +4n
.nf

va_list aq;
*aq = *ap;

.fi
.in
Ǹˡѥ᡼쥸Ϥƥξ硢
.BR va_start ()
ǥơѥ᡼Ǽ
Υѥ᡼ɤ줫ؤ褦ˤɬפ롣

.BR va_arg ()
ǥꥹȤ֤ˤɤꡢ
.BR va_end ()
dzƤ롣
Τ褦ʾб뤿ᡢC99 Ǥ
.BR va_copy ()
ޥɲä
ҤΤ褦ʳƤϰʲΤ褦֤褦ˤ
.in +4n
.nf

va_list aq;
va_copy(aq, ap);
\&...
va_end(aq);

.fi
.in
.RE
.BR va_copy ()
¹Ԥ뤴Ȥˡ
б
.BR va_end ()
ƱؿǼ¹ԤʤФʤʤ
̾Ϥޤ draft proposal ʤΤǡ
.BR va_copy ()

.B __va_copy
Ѥ륷ƥ⤢롣
.SH 
.BR va_start (),
.BR va_arg (),
.BR va_end ()
ޥ C89 Ǥ롣
.BR va_copy ()
 C99 Ƥ롣
.SH 
ΥޥϡѤƤƱΥޥ
ߴǤ\fIʤ\fPΤΤȸߴʥСϡ
󥯥롼ɥե
.I <varargs.h>
¸ߤ롣
.PP
ŪʥåȥåפϰʲΤȤǤ롣
.in +4n
.nf

#include <varargs.h>

void
foo(va_alist)
    va_dcl
{
    va_list ap;

    va_start(ap);
    while (...) {
        ...
        x = va_arg(ap, type);
        ...
    }
    va_end(ap);
}

.fi
.in
.I va_start
ޥ '{' ޤߡ
.I va_end
ޥб '}' ޤॷƥ⤢Τǡ
ĤΥޥƱؿˤʤФʤʤ
.SH Х
.B varargs
ޥȤϰۤʤꡢ
.B stdarg
ޥǤϸʤǴؿꤹ뤳ȤƤʤ

.B varargs
١Υɤ
.B stdarg
Υɤ˽񤭴ȤˡݤʺȤΤȤˤʤ롣
ޤ٤Ƥΰ
.I va_list
ȤƲѸĻꤷ褦ʾ
.RB ( vfprintf (3)
ʤ) ˤ㳲Ȥʤ롣
.SH 
ؿ
.I foo
Ͻʸʤʸ졢νʸб뷿DzѸĤ
ɤ߹ߡ롣
.nf

#include <stdio.h>
#include <stdarg.h>

void
foo(char *fmt, ...)
{
    va_list ap;
    int d;
    char c, *s;

    va_start(ap, fmt);
    while (*fmt)
        switch (*fmt++) {
        case 's':              /* string */
            s = va_arg(ap, char *);
            printf("string %s\en", s);
            break;
        case 'd':              /* int */
            d = va_arg(ap, int);
            printf("int %d\en", d);
            break;
        case 'c':              /* char */
            /* need a cast here since va_arg only
               takes fully promoted types */
            c = (char) va_arg(ap, int);
            printf("char %c\en", c);
            break;
        }
    va_end(ap);
}
.fi