📄 wcswidth.html
字号:
<!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>wcswidth</title></head><body bgcolor="white"><script type="text/javascript" language="JavaScript" src="../jscript/codes.js"></script><basefont size="3"> <a name="wcswidth"></a> <a name="tag_03_852"></a><!-- wcswidth --> <!--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_852_01"></a>NAME</h4><blockquote>wcswidth - number of column positions of a wide-character string</blockquote><h4><a name="tag_03_852_02"></a>SYNOPSIS</h4><blockquote class="synopsis"><div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> #include <<a href="../basedefs/wchar.h.html">wchar.h</a>><br><br> int wcswidth(const wchar_t *</tt><i>pwcs</i><tt>, size_t</tt> <i>n</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"border="0"></tt></code></div><tt><br></tt></blockquote><h4><a name="tag_03_852_03"></a>DESCRIPTION</h4><blockquote><p>The <i>wcswidth</i>() function shall determine the number of column positions required for <i>n</i> wide-character codes (orfewer than <i>n</i> wide-character codes if a null wide-character code is encountered before <i>n</i> wide-character codes areexhausted) in the string pointed to by <i>pwcs</i>.</p></blockquote><h4><a name="tag_03_852_04"></a>RETURN VALUE</h4><blockquote><p>The <i>wcswidth</i>() function either shall return 0 (if <i>pwcs</i> points to a null wide-character code), or return the numberof column positions to be occupied by the wide-character string pointed to by <i>pwcs</i>, or return -1 (if any of the first<i>n</i> wide-character codes in the wide-character string pointed to by <i>pwcs</i> is not a printable wide-character code).</p></blockquote><h4><a name="tag_03_852_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_852_06"></a>EXAMPLES</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_852_07"></a>APPLICATION USAGE</h4><blockquote><p>This function was removed from the final ISO/IEC 9899:1990/Amendment 1:1995 (E), and the return value for a non-printablewide character is not specified.</p></blockquote><h4><a name="tag_03_852_08"></a>RATIONALE</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_852_09"></a>FUTURE DIRECTIONS</h4><blockquote><p>None.</p></blockquote><h4><a name="tag_03_852_10"></a>SEE ALSO</h4><blockquote><p><a href="wcwidth.html"><i>wcwidth</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href="../basedefs/xbd_chap03.html#tag_03_103">Section 3.103, Column Position</a>, <a href="../basedefs/wchar.h.html"><i><wchar.h></i></a></p></blockquote><h4><a name="tag_03_852_11"></a>CHANGE HISTORY</h4><blockquote><p>First released in Issue 4. Derived from the MSE working draft.</p></blockquote><h4><a name="tag_03_852_12"></a>Issue 6</h4><blockquote><p>The Open Group Corrigendum U021/11 is applied. The function is marked as an extension.</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
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -