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	1	.\" Copyright (c) 1989, 1991, 1993
	2	.\" The Regents of the University of California. All rights reserved.
	3	.\"
	4	.\" This code is derived from software contributed to Berkeley by
	5	.\" the American National Standards Committee X3, on Information
	6	.\" Processing Systems.
	7	.\"
	8	.\" Redistribution and use in source and binary forms, with or without
	9	.\" modification, are permitted provided that the following conditions
	10	.\" are met:
	11	.\" 1. Redistributions of source code must retain the above copyright
	12	.\" notice, this list of conditions and the following disclaimer.
	13	.\" 2. Redistributions in binary form must reproduce the above copyright
	14	.\" notice, this list of conditions and the following disclaimer in the
	15	.\" documentation and/or other materials provided with the distribution.
	16	.\" 3. All advertising materials mentioning features or use of this software
	17	.\" must display the following acknowledgement:
	18	.\" This product includes software developed by the University of
	19	.\" California, Berkeley and its contributors.
	20	.\" 4. Neither the name of the University nor the names of its contributors
	21	.\" may be used to endorse or promote products derived from this software
	22	.\" without specific prior written permission.
	23	.\"
	24	.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	25	.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	26	.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	27	.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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	29	.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	30	.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	31	.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	32	.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	33	.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	34	.\" SUCH DAMAGE.
	35	.\"
	36	.\" @(#)tolower.3 8.1 (Berkeley) 6/4/93
	37	.\" $FreeBSD: src/lib/libc/locale/tolower.3,v 1.16 2004/08/21 07:37:08 tjr Exp $
	38	.\"
	39	.Dd August 21, 2004
	40	.Dt TOLOWER 3
	41	.Os
	42	.Sh NAME
	43	.Nm tolower
	44	.Nd upper case to lower case letter conversion
	45	.Sh LIBRARY
	46	.Lb libc
	47	.Sh SYNOPSIS
	48	.In ctype.h
	49	.Ft int
	50	.Fn tolower "int c"
	51	.Sh DESCRIPTION
	52	The
	53	.Fn tolower
	54	function converts an upper-case letter to the corresponding lower-case
	55	letter.
	56	For single C
	57	.Va char Ns s
	58	locales (see
	59	.Xr multibyte 3 )
	60	the value of the argument is
	61	representable as an
	62	.Li unsigned char
	63	or the value of
	64	.Dv EOF .
	65	.Sh RETURN VALUES
	66	If the argument is an upper-case letter, the
	67	.Fn tolower
	68	function returns the corresponding lower-case letter if there is
	69	one; otherwise the argument is returned unchanged.
	70	.Sh COMPATIBILITY
	71	The
	72	.Bx 4.4
	73	extension of accepting arguments outside of the range of the
	74	.Vt "unsigned char"
	75	type in locales with large character sets is considered obsolete
	76	and may not be supported in future releases.
	77	The
	78	.Fn towlower
	79	function should be used instead.
	80	.Sh SEE ALSO
	81	.Xr ctype 3 ,
	82	.Xr islower 3 ,
	83	.Xr multibyte 3 ,
	84	.Xr towlower 3
	85	.Sh STANDARDS
	86	The
	87	.Fn tolower
	88	function conforms to
	89	.St -isoC .