1<html lang="en"> 2<head> 3<title>wcswidth - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Wchar-strings.html#Wchar-strings" title="Wchar strings"> 9<link rel="prev" href="wcstok.html#wcstok" title="wcstok"> 10<link rel="next" href="wcsxfrm.html#wcsxfrm" title="wcsxfrm"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="wcswidth"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="wcsxfrm.html#wcsxfrm">wcsxfrm</a>, 31Previous: <a rel="previous" accesskey="p" href="wcstok.html#wcstok">wcstok</a>, 32Up: <a rel="up" accesskey="u" href="Wchar-strings.html#Wchar-strings">Wchar strings</a> 33<hr> 34</div> 35 36<h3 class="section">6.27 <code>wcswidth</code>—number of column positions of a wide-character string</h3> 37 38<p><a name="index-wcswidth-419"></a><strong>Synopsis</strong> 39<pre class="example"> #include <wchar.h> 40 int wcswidth(const wchar_t *<var>pwcs</var>, size_t <var>n</var>); 41 42</pre> 43 <p><strong>Description</strong><br> 44The <code>wcswidth</code> function shall determine the number of column 45positions required for <var>n</var> wide-character codes (or fewer than <var>n</var> 46wide-character codes if a null wide-character code is encountered 47before <var>n</var> wide-character codes are exhausted) in the string pointed 48to by <var>pwcs</var>. 49 50 <p><br> 51<strong>Returns</strong><br> 52The <code>wcswidth</code> function either shall return 0 (if <var>pwcs</var> points to a 53null wide-character code), or return the number of column positions 54to be occupied by the wide-character string pointed to by <var>pwcs</var>, or 55return -1 (if any of the first <var>n</var> wide-character codes in the 56wide-character string pointed to by <var>pwcs</var> is not a printable 57wide-character code). 58 59 <p><br> 60<strong>Portability</strong><br> 61<code>wcswidth</code> has been introduced in the Single UNIX Specification Volume 2. 62<code>wcswidth</code> has been marked as an extension in the Single UNIX Specification Volume 3. 63 64 <p><br> 65 66 </body></html> 67 68