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<a name="strnstr"></a>
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Next: <a href="strnlen.html#strnlen" accesskey="n" rel="next">strnlen</a>, Previous: <a href="strncpy.html#strncpy" accesskey="p" rel="prev">strncpy</a>, Up: <a href="Strings.html#Strings" accesskey="u" rel="up">Strings</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="strnstr_002d_002d_002dfind-string-segment"></a>
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<h3 class="section">5.35 <code>strnstr</code>—find string segment</h3>
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<a name="index-strnstr"></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 <string.h>
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size_t strnstr(const char *<var>s1</var>, const char *<var>s2</var>, size_t <var>n</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Locates the first occurrence in the string pointed to by <var>s1</var> of
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the sequence of limited to the <var>n</var> characters in the string
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pointed to by <var>s2</var>
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</p>
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<br>
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<p><strong>Returns</strong><br>
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Returns a pointer to the located string segment, or a null
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pointer if the string <var>s2</var> is not found. If <var>s2</var> points to
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a string with zero length, <var>s1</var> is returned.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>strnstr</code> is a BSD extension.
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</p>
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<p><code>strnstr</code> requires no supporting OS subroutines.
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