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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
	28	.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	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	.\" @(#)toupper.3 8.1 (Berkeley) 6/4/93
	37	.\" $FreeBSD: src/lib/libc/locale/toupper.3,v 1.15 2002/10/03 11:14:00 tjr Exp $
	38	.\"
	39	.Dd October 3, 2002
	40	.Dt TOUPPER 3
	41	.Os
	42	.Sh NAME
	43	.Nm toupper
	44	.Nd lower case to upper case letter conversion
	45	.Sh LIBRARY
	46	.Lb libc
	47	.Sh SYNOPSIS
	48	.In ctype.h
	49	.Ft int
	50	.Fn toupper "int c"
	51	.Sh DESCRIPTION
	52	The
	53	.Fn toupper
	54	function converts a lower-case letter to the corresponding
	55	upper-case 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 a lower-case letter, the
	67	.Fn toupper
	68	function returns the corresponding upper-case letter if there is
	69	one; otherwise the argument is returned unchanged.
	70	.Sh COMPATIBILITY
	71	Although
	72	.Fn toupper
	73	accepts arguments outside of the range of the
	74	.Vt "unsigned char"
	75	type in locales with large character sets,
	76	this is a
	77	.Bx 4.4
	78	extension and the
	79	.Fn towupper
	80	function should be used instead for maximum portability.
	81	.Sh SEE ALSO
	82	.Xr ctype 3 ,
	83	.Xr isupper 3 ,
	84	.Xr multibyte 3 ,
	85	.Xr towupper 3
	86	.Sh STANDARDS
	87	The
	88	.Fn toupper
	89	function conforms to
	90	.St -isoC .