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<a name="strnstr_002d_002d_002dfind-string-segment"></a>
<h3 class="section">5.35 <code>strnstr</code>&mdash;find string segment</h3>
<a name="index-strnstr"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;string.h&gt;
size_t strnstr(const char *<var>s1</var>, const char *<var>s2</var>, size_t <var>n</var>);

</pre></div>
<p><strong>Description</strong><br>
Locates the first occurrence in the string pointed to by <var>s1</var> of
the sequence of limited to the <var>n</var> characters in the string
pointed to by <var>s2</var>
</p>
<br>
<p><strong>Returns</strong><br>
Returns a pointer to the located string segment, or a null
pointer if the string <var>s2</var> is not found. If <var>s2</var> points to
a string with zero length, <var>s1</var> is returned.
</p>
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<p><strong>Portability</strong><br>
<code>strnstr</code> is a BSD extension.
</p>
<p><code>strnstr</code> requires no supporting OS subroutines.
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