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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>wcstombs</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_644"> </a>NAME</h4><blockquote>wcstombs - convert a wide-character string to a character string</blockquote><h4><a name = "tag_000_010_645"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="stdlib.h.html">stdlib.h</a>>size_t wcstombs(char *<i>s</i>, const wchar_t *<i>pwcs</i>, size_t <i>n</i>);</code></pre></blockquote><h4><a name = "tag_000_010_646"> </a>DESCRIPTION</h4><blockquote>The<i>wcstombs()</i>function converts the sequence of wide-character codes thatare in the array pointed to by<i>pwcs</i>into a sequence of characters that begins in the initialshift state and stores these charactersinto the array pointed to by<i>s</i>,stopping if a character would exceed the limit of<i>n</i>total bytes or if a null byte is stored.Each wide-character code is converted as if by a call to<i><a href="wctomb.html">wctomb()</a></i>,except that the shift state of<i><a href="wctomb.html">wctomb()</a></i>is not affected.<p>The behaviour of this function is affected by the LC_CTYPEcategory of the current locale.<p>No more than<i>n</i>bytes will be modified in the array pointed to by<i>s</i>.If copying takes place between objects that overlap, thebehaviour is undefined.If<i>s</i>is a null pointer,<i>wcstombs()</i>returns the length required to convert the entire array regardless of thevalue of<i>n</i>,but no values are stored.function returns the number of bytes required for the character array.</blockquote><h4><a name = "tag_000_010_647"> </a>RETURN VALUE</h4><blockquote>If a wide-character code is encountered that does notcorrespond to a valid character (of one or more bytes each),<i>wcstombs()</i>returns (<b>size_t</b>)-1.Otherwise,<i>wcstombs()</i>returns the number of bytes stored in the character array,not including any terminating null byte.The array will not be null-terminated if the valuereturned is<i>n</i>.</blockquote><h4><a name = "tag_000_010_648"> </a>ERRORS</h4><blockquote>The<i>wcstombs()</i>function may fail if:<dl compact><dt>[EILSEQ]<dd>A wide-character code does not correspond to a valid character.</dl></blockquote><h4><a name = "tag_000_010_649"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_650"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_651"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_652"> </a>SEE ALSO</h4><blockquote><i><a href="mblen.html">mblen()</a></i>,<i><a href="mbtowc.html">mbtowc()</a></i>,<i><a href="mbstowcs.html">mbstowcs()</a></i>,<i><a href="wctomb.html">wctomb()</a></i>,<i><a href="stdlib.h.html"><stdlib.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the ISO C standard.</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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