146 lines
4.2 KiB
HTML
146 lines
4.2 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 -->
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>strlen</title>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="strlen"></a> <a name="tag_03_730"></a><!-- strlen -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_730_01"></a>NAME</h4>
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<blockquote>strlen - get string length</blockquote>
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<h4><a name="tag_03_730_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/string.h.html">string.h</a>><br>
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<br>
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size_t strlen(const char *</tt><i>s</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_730_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>strlen</i>() function shall compute the number of bytes in the string to which <i>s</i> points, not including the
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terminating null byte.</p>
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</blockquote>
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<h4><a name="tag_03_730_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>strlen</i>() function shall return the length of <i>s</i>; no return value shall be reserved to indicate an error.</p>
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</blockquote>
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<h4><a name="tag_03_730_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_730_06"></a>EXAMPLES</h4>
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<blockquote>
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<h5><a name="tag_03_730_06_01"></a>Getting String Lengths</h5>
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<p>The following example sets the maximum length of <i>key</i> and <i>data</i> by using <i>strlen</i>() to get the lengths of those
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strings.</p>
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<pre>
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<tt>#include <string.h>
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...
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struct element {
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char *key;
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char *data;
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};
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...
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char *key, *data;
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int len;
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<br>
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*keylength = *datalength = 0;
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...
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if ((len = strlen(key)) > *keylength)
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*keylength = len;
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if ((len = strlen(data)) > *datalength)
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*datalength = len;
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...
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</tt>
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</pre>
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</blockquote>
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<h4><a name="tag_03_730_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_730_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_730_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_730_10"></a>SEE ALSO</h4>
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<blockquote>
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<p>The Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/string.h.html"><i><string.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_730_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_730_12"></a>Issue 5</h4>
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<blockquote>
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<p>The RETURN VALUE section is updated to indicate that <i>strlen</i>() returns the length of <i>s</i>, and not <i>s</i> itself as
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was previously stated.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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