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<a name="wcscspn_002d_002d_002dget-length-of-a-complementary-wide-substring"></a>
<h3 class="section">6.13 <code>wcscspn</code>&mdash;get length of a complementary wide substring</h3>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;wchar.h&gt;
size_t wcscspn(const wchar_t *<var>s</var>, wchar_t *<var>set</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>wcscspn</code> function computes the length of the maximum initial
segment of the wide-character string pointed to by <var>s</var> which consists
entirely of wide-character codes not from the wide-character string
pointed to by <var>set</var>. 
</p>
<br>
<p><strong>Returns</strong><br>
The <code>wcscspn</code> function returns the length of the initial substring of
<var>s1</var>; no return value is reserved to indicate an error.
</p>
<br>
<p><strong>Portability</strong><br>
<code>wcscspn</code> is ISO/IEC 9899/AMD1:1995 (ISO C).
</p>
<p>No supporting OS subroutines are required.
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