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<title>The Red Hat newlib C Library: memmem</title>
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Next: <a href="memmove.html#memmove" accesskey="n" rel="next">memmove</a>, Previous: <a href="memcpy.html#memcpy" accesskey="p" rel="prev">memcpy</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="memmem_002d_002d_002dfind-memory-segment"></a>
<h3 class="section">5.9 <code>memmem</code>—find memory segment</h3>
<a name="index-memmem"></a>
<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include <string.h>
char *memmem(const void *<var>s1</var>, size_t <var>l1</var>, const void *<var>s2</var>,
size_t <var>l2</var>);
</pre></div>
<p><strong>Description</strong><br>
</p>
<p>Locates the first occurrence in the memory region pointed to
by <var>s1</var> with length <var>l1</var> of the sequence of bytes pointed
to by <var>s2</var> of length <var>l2</var>. If you already know the
lengths of your haystack and needle, <code>memmem</code> can be much
faster than <code>strstr</code>.
</p>
<br>
<p><strong>Returns</strong><br>
Returns a pointer to the located segment, or a null pointer if
<var>s2</var> is not found. If <var>l2</var> is 0, <var>s1</var> is returned.
</p>
<br>
<p><strong>Portability</strong><br>
<code>memmem</code> is a newlib extension.
</p>
<p><code>memmem</code> requires no supporting OS subroutines.
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