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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>wcrtomb</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_010_464"> </a>NAME</h4><blockquote>wcrtomb - convert a wide-character code to a character (restartable)</blockquote><h4><a name = "tag_000_010_465"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdio.h.html">stdio.h</a>>size_t wcrtomb(char *<i>s</i>, wchar_t <i>wc</i>, mbstate_t *<i>ps</i>);</code></pre></blockquote><h4><a name = "tag_000_010_466"> </a>DESCRIPTION</h4><blockquote>If<i>s</i>is a null pointer, the<i>wcrtomb()</i>function is equivalent to the call:<pre><code>wcrtomb(buf, L'\0', ps)</code></pre><p>where<i>buf</i>is an internal buffer.<p>If<i>s</i>is not a null pointer, the<i>wcrtomb()</i>function determines the number of bytes needed to represent thecharacter that corresponds to the wide-character given by<i>wc</i>(including any shift sequences), and stores the resulting bytes in thearray whose first element is pointed to by<i>s</i>.At most MB_CUR_MAX bytes are stored. If<i>wc</i>is a null wide-character, a null byte is stored, preceded by any shiftsequence needed to restore the initial shift state. The resultingstate described is the initial conversion state.<p>If<i>ps</i>is a null pointer, the<i>wcrtomb()</i>function uses its own internal<b>mbstate_t</b>object, which is initialised at program startup to the initialconversion state. Otherwise, the <b>mbstate_t</b>object pointed to by<i>ps</i>is used to completely describe the current conversion state of theassociated character sequence.The implementation will behave as if no function defined in thisspecification calls<i>wcrtomb()</i>.<p>The behaviour of this function is affected by the LC_CTYPE category ofthe current locale. </blockquote><h4><a name = "tag_000_010_467"> </a>RETURN VALUE</h4><blockquote>The<i>wcrtomb()</i>function returns the number of bytes stored in the array object(including any shift sequences). When<i>wc</i>is not a valid wide-character, an encoding error occurs. In thiscase, the function stores the value of the macros EILSEQ in<i>errno</i>and returns<b>(size_t)-1</b>;the conversion state is undefined.</blockquote><h4><a name = "tag_000_010_468"> </a>ERRORS</h4><blockquote>The<i>wcrtomb()</i>function may fail if:<dl compact><dt>[EINVAL]<dd><i>ps</i>points to an object that contains an invalid conversion state.<dt>[EILSEQ]<dd>Invalid wide-character code is detected.</dl></blockquote><h4><a name = "tag_000_010_469"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_470"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_471"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_472"> </a>SEE ALSO</h4><blockquote><i><a href="mbsinit.html">mbsinit()</a></i>,<i><a href="wchar.h.html"><wchar.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the ISO/IEC 9899:1990/Amendment 1:1995 (E).</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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