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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>wcwidth</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_731"> </a>NAME</h4><blockquote>wcwidth - number of column positions of a wide-character code</blockquote><h4><a name = "tag_000_010_732"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="wchar.h.html">wchar.h</a>>int wcwidth(wchar_t <i>wc</i>);</code></pre></blockquote><h4><a name = "tag_000_010_733"> </a>DESCRIPTION</h4><blockquote>The<i>wcwidth()</i>function determines the number of column positions required for thewide character<i>wc</i>.The value of<i>wc</i>must be a character representable as a<b>wchar_t</b>,and must be a wide-character code corresponding to a valid character in thecurrent locale.</blockquote><h4><a name = "tag_000_010_734"> </a>RETURN VALUE</h4><blockquote>The<i>wcwidth()</i>function either returns 0 (if<i>wc</i>is a null wide-character code), or returns the number ofcolumn positions to be occupied by the wide-character code<i>wc</i>,or returns -1 (if<i>wc</i>does not correspond to a printing wide-character code).</blockquote><h4><a name = "tag_000_010_735"> </a>ERRORS</h4><blockquote>No errors are defined.</blockquote><h4><a name = "tag_000_010_736"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_737"> </a>APPLICATION USAGE</h4><blockquote>This function was removed from the final ISO C Amendment 1,and the return value for a non-printable wide characteris not specified.</blockquote><h4><a name = "tag_000_010_738"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_739"> </a>SEE ALSO</h4><blockquote><i><a href="wcswidth.html">wcswidth()</a></i>,<i><a href="wchar.h.html"><wchar.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from MSE working draft.</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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