You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
3.4 KiB
HTML
86 lines
3.4 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>va_start (The Red Hat newlib C Library)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="va_start (The Red Hat newlib C Library)">
|
||
|
|
<meta name="keywords" content="va_start (The Red Hat newlib C Library)">
|
||
|
|
<meta name="resource-type" content="document">
|
||
|
|
<meta name="distribution" content="global">
|
||
|
|
<meta name="Generator" content="makeinfo">
|
||
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
||
|
|
<link href="index.html#Top" rel="start" title="Top">
|
||
|
|
<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
|
||
|
|
<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Stdarg.html#Stdarg" rel="up" title="Stdarg">
|
||
|
|
<link href="va_005farg.html#va_005farg" rel="next" title="va_arg">
|
||
|
|
<link href="Stdarg.html#Stdarg" rel="prev" title="Stdarg">
|
||
|
|
<style type="text/css">
|
||
|
|
<!--
|
||
|
|
a.summary-letter {text-decoration: none}
|
||
|
|
blockquote.indentedblock {margin-right: 0em}
|
||
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
||
|
|
blockquote.smallquotation {font-size: smaller}
|
||
|
|
div.display {margin-left: 3.2em}
|
||
|
|
div.example {margin-left: 3.2em}
|
||
|
|
div.lisp {margin-left: 3.2em}
|
||
|
|
div.smalldisplay {margin-left: 3.2em}
|
||
|
|
div.smallexample {margin-left: 3.2em}
|
||
|
|
div.smalllisp {margin-left: 3.2em}
|
||
|
|
kbd {font-style: oblique}
|
||
|
|
pre.display {font-family: inherit}
|
||
|
|
pre.format {font-family: inherit}
|
||
|
|
pre.menu-comment {font-family: serif}
|
||
|
|
pre.menu-preformatted {font-family: serif}
|
||
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smallexample {font-size: smaller}
|
||
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
||
|
|
pre.smalllisp {font-size: smaller}
|
||
|
|
span.nolinebreak {white-space: nowrap}
|
||
|
|
span.roman {font-family: initial; font-weight: normal}
|
||
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
||
|
|
ul.no-bullet {list-style: none}
|
||
|
|
-->
|
||
|
|
</style>
|
||
|
|
|
||
|
|
|
||
|
|
</head>
|
||
|
|
|
||
|
|
<body lang="en">
|
||
|
|
<a name="va_005fstart"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="va_005farg.html#va_005farg" accesskey="n" rel="next">va_arg</a>, Up: <a href="Stdarg.html#Stdarg" accesskey="u" rel="up">Stdarg</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Initialize-variable-argument-list"></a>
|
||
|
|
<h4 class="subsection">14.1.1 Initialize variable argument list</h4>
|
||
|
|
<a name="index-va_005fstart"></a>
|
||
|
|
<p><strong>Synopsis</strong>
|
||
|
|
</p><div class="example">
|
||
|
|
<pre class="example">#include <stdarg.h>
|
||
|
|
void va_start(va_list <var>ap</var>, <var>rightmost</var>);
|
||
|
|
</pre></div>
|
||
|
|
|
||
|
|
<p><strong>Description</strong><br>
|
||
|
|
Use <code>va_start</code> to initialize the variable argument list <var>ap</var>,
|
||
|
|
so that <code>va_arg</code> can extract values from it. <var>rightmost</var> is
|
||
|
|
the name of the last explicit argument in the parameter list (the
|
||
|
|
argument immediately preceding the ellipsis ‘<samp>...</samp>’ that flags
|
||
|
|
variable arguments in an ANSI C function header). You can only use
|
||
|
|
<code>va_start</code> in a function declared using this ellipsis notation
|
||
|
|
(not, for example, in one of its subfunctions).
|
||
|
|
</p>
|
||
|
|
<p><strong>Returns</strong><br>
|
||
|
|
<code>va_start</code> does not return a result.
|
||
|
|
</p>
|
||
|
|
<p><strong>Portability</strong><br>
|
||
|
|
ANSI C requires <code>va_start</code>.
|
||
|
|
</p>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|