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<a name="strcspn_002d_002d_002dcount-characters-not-in-string"></a>
<h3 class="section">5.26 <code>strcspn</code>&mdash;count characters not in string</h3>
<a name="index-strcspn"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">size_t strcspn(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 part of
the string pointed to by <var>s1</var> which consists entirely of
characters <var>NOT</var> from the string pointed to by <var>s2</var>
(excluding the terminating null character).
</p>
<br>
<p><strong>Returns</strong><br>
<code>strcspn</code> returns the length of the substring found.
</p>
<br>
<p><strong>Portability</strong><br>
<code>strcspn</code> is ANSI C.
</p>
<p><code>strcspn</code> requires no supporting OS subroutines.
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