.\"	$OpenBSD: towlower.3,v 1.5 2014/04/07 17:57:56 schwarze Exp $
.\"	$NetBSD: towlower.3,v 1.7 2003/09/08 17:54:31 wiz Exp $
.\"
.\" Copyright (c) 1989, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.\" modification, are permitted provided that the following conditions
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.\"	@(#)tolower.3	5.2 (Berkeley) 6/29/91
.\"
.Dd $Mdocdate: April 7 2014 $
.Dt TOWLOWER 3
.Os
.Sh NAME
.Nm towlower ,
.Nm towupper
.Nd wide-character case letter conversion utilities
.Sh SYNOPSIS
.In wctype.h
.Ft wint_t
.Fn towlower "wint_t wc"
.Ft wint_t
.Fn towupper "wint_t wc"
.Sh DESCRIPTION
The
.Fn towlower
function converts an upper-case wide character to the corresponding lower-case
letter.
The
.Fn towupper
function converts an lower-case wide character to the corresponding upper-case
letter.
.Sh RETURN VALUES
If the argument is an upper/lower-case letter, the
.Fn tolower
function returns the corresponding counterpart if there is
one; otherwise the argument is returned unchanged.
.Sh SEE ALSO
.Xr tolower 3 ,
.Xr toupper 3
.Sh STANDARDS
The functions conform to
.St -isoC-amd1
and
.St -isoC-99 .