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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) 2001-2003 The Open Group, All Rights Reserved --><title>towctrans</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="towctrans"></a> <a name="tag_03_786"></a><!-- towctrans --> <!--header start--><center><font size="2">The Open Group Base Specifications Issue 6<br>IEEE Std 1003.1, 2003 Edition<br>Copyright © 2001-2003 The IEEE and The Open Group, All Rights reserved.</font></center><!--header end--><hr size="2" noshade><h4><a name="tag_03_786_01"></a>NAME</h4><blockquote>towctrans - wide-character transliteration</blockquote><h4><a name="tag_03_786_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><p><code><tt>#include <<a href="../basedefs/wctype.h.html">wctype.h</a>><br><br> wint_t towctrans(wint_t</tt> <i>wc</i><tt>, wctrans_t</tt> <i>desc</i><tt>);<br></tt></code></p></blockquote><h4><a name="tag_03_786_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>towctrans</i>() function shall transliterate the wide-character code <i>wc</i> using the mapping described by<i>desc</i>. The current setting of the <i>LC_CTYPE</i> category should be the same as during the call to <a href="../functions/wctrans.html"><i>wctrans</i>()</a> that returned the value <i>desc</i>. <sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If the valueof <i>desc</i> is invalid (that is, not obtained by a call to <a href="../functions/wctrans.html"><i>wctrans</i>()</a> or<i>desc</i> is invalidated by a subsequent call to <a href="../functions/setlocale.html"><i>setlocale</i>()</a> that has affectedcategory <i>LC_CTYPE ),</i> the result is unspecified.</p><p>An application wishing to check for error situations should set <i>errno</i> to 0 before calling <i>towctrans</i>(). If<i>errno</i> is non-zero on return, an error has occurred. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p></blockquote><h4><a name="tag_03_786_04"></a>RETURN VALUE</h4><blockquote><p>If successful, the <i>towctrans</i>() function shall return the mapped value of <i>wc</i> using the mapping described by<i>desc</i>. Otherwise, it shall return <i>wc</i> unchanged.</p></blockquote><h4><a name="tag_03_786_05"></a>ERRORS</h4><blockquote><p>The <i>towctrans</i>() function may fail if:</p><dl compact><dt>[EINVAL]</dt><dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"><i>desc</i> contains an invalid transliteration descriptor. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></dd></dl></blockquote><hr><div class="box"><em>The following sections are informative.</em></div><h4><a name="tag_03_786_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_786_07"></a>APPLICATION USAGE</h4><blockquote><p>The strings <tt>"tolower"</tt> and <tt>"toupper"</tt> are reserved for the standard mapping names. In the table below, thefunctions in the left column are equivalent to the functions in the right column.</p><pre><tt>towlower(</tt><i>wc</i><tt>) towctrans(</tt><i>wc</i><tt>, wctrans("tolower"))towupper(</tt><i>wc</i><tt>) towctrans(</tt><i>wc</i><tt>, wctrans("toupper"))</tt></pre></blockquote><h4><a name="tag_03_786_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_786_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_786_10"></a>SEE ALSO</h4><blockquote><p><a href="towlower.html"><i>towlower</i>()</a> , <a href="towupper.html"><i>towupper</i>()</a> , <a href="wctrans.html"><i>wctrans</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/wctype.h.html"><i><wctype.h></i></a></p></blockquote><h4><a name="tag_03_786_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 5. Derived from ISO/IEC 9899:1990/Amendment 1:1995 (E).</p></blockquote><h4><a name="tag_03_786_12"></a>Issue 6</h4><blockquote><p>Extensions beyond the ISO C standard are marked.</p></blockquote><div class="box"><em>End of informative text.</em></div><hr><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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