1<html lang="en"> 2<head> 3<title>memmem - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Strings.html#Strings" title="Strings"> 9<link rel="prev" href="memcpy.html#memcpy" title="memcpy"> 10<link rel="next" href="memmove.html#memmove" title="memmove"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="memmem"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="memmove.html#memmove">memmove</a>, 31Previous: <a rel="previous" accesskey="p" href="memcpy.html#memcpy">memcpy</a>, 32Up: <a rel="up" accesskey="u" href="Strings.html#Strings">Strings</a> 33<hr> 34</div> 35 36<h3 class="section">5.9 <code>memmem</code>—find memory segment</h3> 37 38<p><a name="index-memmem-378"></a><strong>Synopsis</strong> 39<pre class="example"> #include <string.h> 40 char *memmem(const void *<var>s1</var>, size_t <var>l1</var>, const void *<var>s2</var>, 41 size_t <var>l2</var>); 42 43</pre> 44 <p><strong>Description</strong><br> 45 46 <p>Locates the first occurrence in the memory region pointed to 47by <var>s1</var> with length <var>l1</var> of the sequence of bytes pointed 48to by <var>s2</var> of length <var>l2</var>. If you already know the 49lengths of your haystack and needle, <code>memmem</code> can be much 50faster than <code>strstr</code>. 51 52 <p><br> 53<strong>Returns</strong><br> 54Returns a pointer to the located segment, or a null pointer if 55<var>s2</var> is not found. If <var>l2</var> is 0, <var>s1</var> is returned. 56 57 <p><br> 58<strong>Portability</strong><br> 59<code>memmem</code> is a newlib extension. 60 61 <p><code>memmem</code> requires no supporting OS subroutines. 62 63 <p><br> 64 65 </body></html> 66 67