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