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86 lines
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86 lines
3.4 KiB
HTML
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<a name="va_005fstart"></a>
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<p>
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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>
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<a name="Initialize-variable-argument-list"></a>
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<h4 class="subsection">14.1.1 Initialize variable argument list</h4>
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<a name="index-va_005fstart"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdarg.h>
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void va_start(va_list <var>ap</var>, <var>rightmost</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use <code>va_start</code> to initialize the variable argument list <var>ap</var>,
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so that <code>va_arg</code> can extract values from it. <var>rightmost</var> is
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the name of the last explicit argument in the parameter list (the
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argument immediately preceding the ellipsis ‘<samp>...</samp>’ that flags
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variable arguments in an ANSI C function header). You can only use
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<code>va_start</code> in a function declared using this ellipsis notation
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(not, for example, in one of its subfunctions).
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</p>
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<p><strong>Returns</strong><br>
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<code>va_start</code> does not return a result.
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</p>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>va_start</code>.
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