.\" 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: src/lib/libc/string/wcswidth.3,v 1.2 2002/12/09 14:04:05 ru Exp $ .\" .Dd August 20, 2002 .Dt WCSWIDTH 3 .Os .Sh NAME .Nm wcswidth , .Nm wcswidth_l .Nd "number of column positions in wide-character string" .Sh LIBRARY .Lb libc .Sh SYNOPSIS .In wchar.h .Ft int .Fo wcswidth .Fa "const wchar_t *pwcs" .Fa "size_t n" .Fc .In wchar.h .In xlocale.h .Ft int .Fo wcswidth_l .Fa "const wchar_t *pwcs" .Fa "size_t n" .Fa "locale_t loc" .Fc .Sh DESCRIPTION The .Fn wcswidth function determines the number of column positions required for the first .Fa n characters of .Fa pwcs , or until a null wide character (L'\e0') is encountered. .Pp Although the .Fn wcswidth function uses the current locale, the .Fn wcswidth_l function may be passed a locale directly. See .Xr xlocale 3 for more information. .Sh RETURN VALUES The .Fn wcswidth function returns 0 if .Fa pwcs is an empty string (L""), \-1 if a non-printing wide character is encountered; otherwise, it returns the number of column positions occupied. .Sh SEE ALSO .Xr iswprint 3 , .Xr wcwidth 3 , .Xr xlocale 3 .Sh STANDARDS The .Fn wcswidth function conforms to .St -p1003.1-2001 .