.\" $NetBSD: wcswidth.3,v 1.1 2006/06/03 04:36:45 tnozaki Exp $
.\" FreeBSD: src/lib/libc/string/wcswidth.3,v 1.2 2002/12/09 14:04:05 ru Exp
.\"
.\" Copyright (c) 2002 Tim J. Robbins
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.Dd August 20, 2002
.Dt WCSWIDTH 3
.Os
.Sh NAME
.Nm wcswidth
.Nd "number of column positions in wide-character string"
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In wchar.h
.Ft int
.Fn wcswidth "const wchar_t *pwcs" "size_t n"
.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.
.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
.Sh STANDARDS
The
.Fn wcswidth
function conforms to
.St -p1003.1-2001 .