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	1	.\" Copyright (c) 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	.\" @(#)islower.3 8.1 (Berkeley) 6/4/93
	37	.\" $FreeBSD: src/lib/libc/locale/islower.3,v 1.15 2002/10/06 10:15:38 tjr Exp $
	38	.\"
	39	.Dd October 6, 2002
	40	.Dt ISLOWER 3
	41	.Os
	42	.Sh NAME
	43	.Nm islower
	44	.Nd lower-case character test
	45	.Sh LIBRARY
	46	.Lb libc
	47	.Sh SYNOPSIS
	48	.In ctype.h
	49	.Ft int
	50	.Fn islower "int c"
	51	.Sh DESCRIPTION
	52	The
	53	.Fn islower
	54	function tests for any lower-case letters.
	55	For single C
	56	.Va char Ns s
	57	locales (see
	58	.Xr multibyte 3 )
	59	the value of the argument is
	60	representable as an
	61	.Li unsigned char
	62	or the value of
	63	.Dv EOF .
	64	In the ASCII character set, this includes the following characters
	65	(with their numeric values shown in octal):
	66	.Pp
	67	.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
	68	.It "\&141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d'' \t145\ ``e''"
	69	.It "\&146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i'' \t152\ ``j''"
	70	.It "\&153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n'' \t157\ ``o''"
	71	.It "\&160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s'' \t164\ ``t''"
	72	.It "\&165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x'' \t171\ ``y''"
	73	.It "\&172\ ``z''"
	74	.El
	75	.Sh RETURN VALUES
	76	The
	77	.Fn islower
	78	function returns zero if the character tests false and
	79	returns non-zero if the character tests true.
	80	.Sh COMPATIBILITY
	81	Although
	82	.Fn islower
	83	accepts arguments outside of the range of the
	84	.Vt "unsigned char"
	85	type in locales with large character sets,
	86	this is a
	87	.Bx 4.4
	88	extension and the
	89	.Fn iswlower
	90	function should be used instead for maximum portability.
	91	.Sh SEE ALSO
	92	.Xr ctype 3 ,
	93	.Xr iswlower 3 ,
	94	.Xr multibyte 3 ,
	95	.Xr tolower 3 ,
	96	.Xr ascii 7
	97	.Sh STANDARDS
	98	The
	99	.Fn islower
	100	function conforms to
	101	.St -isoC .