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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><meta name="generator" content="HTML Tidy, see www.w3.org"><meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"><link type="text/css" rel="stylesheet" href="style.css"><!-- Generated by The Open Group's rhtm tool v1.2.1 --><!-- Copyright (c) 2001-2004 IEEE and The Open Group, All Rights Reserved --><title>strcspn</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="strcspn"></a> <a name="tag_03_725"></a><!-- strcspn --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2004 Edition<br>Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_725_01"></a>NAME</h4><blockquote>strcspn - get the length of a complementary substring</blockquote><h4><a name="tag_03_725_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/string.h.html">string.h</a>><br><br> size_t strcspn(const char *</tt><i>s1</i><tt>, const char *</tt><i>s2</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_725_03"></a>DESCRIPTION</h4><blockquote><div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between therequirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers tothe ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div><p>The <i>strcspn</i>() function shall compute the length (in bytes) of the maximum initial segment of the string pointed to by<i>s1</i> which consists entirely of bytes <i>not</i> from the string pointed to by <i>s2</i>.</p></blockquote><h4><a name="tag_03_725_04"></a>RETURN VALUE</h4><blockquote><p>The <i>strcspn</i>() function shall return the length of the computed segment of the string pointed to by <i>s1</i>; no returnvalue is reserved to indicate an error.</p></blockquote><h4><a name="tag_03_725_05"></a>ERRORS</h4><blockquote><p>No errors are defined.</p></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_725_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_725_07"></a>APPLICATION USAGE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_725_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_725_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_725_10"></a>SEE ALSO</h4><blockquote><p><a href="strspn.html"><i>strspn</i>()</a>, the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/string.h.html"><i><string.h></i></a></p></blockquote><h4><a name="tag_03_725_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 1. Derived from Issue 1 of the SVID.</p></blockquote><h4><a name="tag_03_725_12"></a>Issue 5</h4><blockquote><p>The RETURN VALUE section is updated to indicate that <i>strcspn</i>() returns the length of <i>s1</i>, and not <i>s1</i> itselfas was previously stated.</p></blockquote><h4><a name="tag_03_725_13"></a>Issue 6</h4><blockquote><p>The Open Group Corrigendum U030/1 is applied. The text of the RETURN VALUE section is updated to indicate that the computedsegment length is returned, not the <i>s1</i> length.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr size="2" noshade><center><font size="2"><!--footer start-->UNIX ® is a registered Trademark of The Open Group.<br>POSIX ® is a registered Trademark of The IEEE.<br>[ <a href="../mindex.html">Main Index</a> | <a href="../basedefs/contents.html">XBD</a> | <a href="../utilities/contents.html">XCU</a> | <a href="../functions/contents.html">XSH</a> | <a href="../xrat/contents.html">XRAT</a>]</font></center><!--footer end--><hr size="2" noshade></body></html>⌨️ 快捷键说明
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