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<a name="strspn_002d_002d_002dfind-initial-match"></a>
<h3 class="section">5.40 <code>strspn</code>&mdash;find initial match</h3>
<a name="index-strspn"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;string.h&gt;
size_t strspn(const char *<var>s1</var>, const char *<var>s2</var>);

</pre></div>
<p><strong>Description</strong><br>
This function computes the length of the initial segment of
the string pointed to by <var>s1</var> which consists entirely of
characters from the string pointed to by <var>s2</var> (excluding the
terminating null character).
</p>
<br>
<p><strong>Returns</strong><br>
<code>strspn</code> returns the length of the segment found.
</p>
<br>
<p><strong>Portability</strong><br>
<code>strspn</code> is ANSI C.
</p>
<p><code>strspn</code> requires no supporting OS subroutines.
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