1.\" Copyright (c) 2002 Tim J. Robbins 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 13.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 17.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23.\" SUCH DAMAGE. 24.\" 25.\" $FreeBSD$ 26.Dd August 8, 1999 27.Dt WCSWIDTH 3 28.Os 29.Sh NAME 30.Nm wcswidth 31.Nd "number of column positions in wide-character string" 32.Sh LIBRARY 33.Lb libc 34.Sh SYNOPSIS 35.In wchar.h 36.Ft int 37.Fn wcswidth "const wchar_t *pwcs" "size_t n" 38.Sh DESCRIPTION 39The 40.Fn wcswidth 41function determines the number of column positions required for the first 42.Fa n 43characters of 44.Fa pwcs , 45or until a null wide character (L'\e0') is encountered. 46.Sh RETURN VALUES 47The 48.Fn wcswidth 49function returns 0 if 50.Fa pwcs 51is an empty string (L""), 52-1 if a non-printing wide character is encountered, 53otherwise it returns the number of column positions occupied. 54.Sh SEE ALSO 55.Xr iswprint 3 , 56.Xr wcwidth 3 57.Sh STANDARDS 58The 59.Fn wcswidth 60function conforms to 61.St -p1003.1-2001 . 62