2002-08-20 03:42:21 +00:00
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.\" Copyright (c) 2002 Tim J. Robbins
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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2002-11-29 17:35:09 +00:00
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.\"
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2004-08-17 04:45:52 +00:00
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.Dd August 17, 2004
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2002-08-20 03:42:21 +00:00
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.Dt WCWIDTH 3
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.Os
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.Sh NAME
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.Nm wcwidth
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.Nd "number of column positions of a wide-character code"
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In wchar.h
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.Ft int
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.Fn wcwidth "wchar_t wc"
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.Sh DESCRIPTION
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The
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.Fn wcwidth
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function determines the number of column positions required to
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display the wide character
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.Fa wc .
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.Sh RETURN VALUES
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The
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.Fn wcwidth
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function returns 0 if the
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.Fa wc
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argument is a null wide character (L'\e0'),
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2002-11-29 17:35:09 +00:00
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\-1 if
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2002-08-20 03:42:21 +00:00
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.Fa wc
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is not printable,
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otherwise it returns the number of column positions the
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character occupies.
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2002-10-03 08:49:29 +00:00
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.Sh EXAMPLES
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This code fragment reads text from standard input and
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breaks lines that are more than 20 column positions wide,
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similar to the
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.Xr fold 1
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utility:
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.Bd -literal -offset indent
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wint_t ch;
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int column, w;
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column = 0;
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while ((ch = getwchar()) != WEOF) {
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2004-08-12 12:32:14 +00:00
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w = wcwidth(ch);
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if (w > 0 && column + w >= 20) {
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2002-11-29 17:35:09 +00:00
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putwchar(L'\en');
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2004-08-17 04:56:03 +00:00
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column = 0;
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2002-10-03 08:49:29 +00:00
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}
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putwchar(ch);
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2002-11-29 17:35:09 +00:00
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if (ch == L'\en')
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2002-10-03 08:49:29 +00:00
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column = 0;
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2004-08-12 12:32:14 +00:00
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else if (w > 0)
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column += w;
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2002-10-03 08:49:29 +00:00
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}
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.Ed
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2002-08-20 03:42:21 +00:00
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.Sh SEE ALSO
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.Xr iswprint 3 ,
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.Xr wcswidth 3
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.Sh STANDARDS
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The
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.Fn wcwidth
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function conforms to
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.St -p1003.1-2001 .
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