1<html lang="en"> 2<head> 3<title>strstr - 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="strspn.html#strspn" title="strspn"> 10<link rel="next" href="strtok.html#strtok" title="strtok"> 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="strstr"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="strtok.html#strtok">strtok</a>, 31Previous: <a rel="previous" accesskey="p" href="strspn.html#strspn">strspn</a>, 32Up: <a rel="up" accesskey="u" href="Strings.html#Strings">Strings</a> 33<hr> 34</div> 35 36<h3 class="section">5.37 <code>strstr</code>—find string segment</h3> 37 38<p><a name="index-strstr-405"></a><strong>Synopsis</strong> 39<pre class="example"> #include <string.h> 40 char *strstr(const char *<var>s1</var>, const char *<var>s2</var>); 41 42</pre> 43 <p><strong>Description</strong><br> 44Locates the first occurrence in the string pointed to by <var>s1</var> of 45the sequence of characters in the string pointed to by <var>s2</var> 46(excluding the terminating null character). 47 48 <p><br> 49<strong>Returns</strong><br> 50Returns a pointer to the located string segment, or a null 51pointer if the string <var>s2</var> is not found. If <var>s2</var> points to 52a string with zero length, <var>s1</var> is returned. 53 54 <p><br> 55<strong>Portability</strong><br> 56<code>strstr</code> is ANSI C. 57 58 <p><code>strstr</code> requires no supporting OS subroutines. 59 60 <p><br> 61 62 </body></html> 63 64