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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	.\" @(#)isxdigit.3 8.1 (Berkeley) 6/4/93
	37	.\" $FreeBSD: src/lib/libc/locale/isxdigit.3,v 1.20 2004/08/21 07:37:08 tjr Exp $
	38	.\"
	39	.Dd August 21, 2004
	40	.Dt ISXDIGIT 3
	41	.Os
	42	.Sh NAME
	43	.Nm isxdigit, ishexnumber
	44	.Nd hexadecimal-digit character test
	45	.Sh LIBRARY
	46	.Lb libc
	47	.Sh SYNOPSIS
	48	.In ctype.h
	49	.Ft int
	50	.Fn isxdigit "int c"
	51	.Ft int
	52	.Fn ishexnumber "int c"
	53	.Sh DESCRIPTION
	54	The
	55	.Fn isxdigit
	56	function tests for any hexadecimal-digit character.
	57	Regardless of locale, this includes the following characters only:
	58	.Pp
	59	.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______
	60	.It "\&``0''\t``1''\t``2''\t``3''\t``4''"
	61	.It "\&``5''\t``6''\t``7''\t``8''\t``9''"
	62	.It "\&``A''\t``B''\t``C''\t``D''\t``E''"
	63	.It "\&``F''\t``a''\t``b''\t``c''\t``d''"
	64	.It "\&``e''\t``f''"
	65	.El
	66	.Pp
	67	The
	68	.Fn ishexnumber
	69	function behaves similarly to
	70	.Fn isxdigit ,
	71	but may recognize additional characters,
	72	depending on the current locale setting.
	73	.Pp
	74	For single C
	75	.Va char Ns s
	76	locales (see
	77	.Xr multibyte 3 )
	78	the value of the argument is
	79	representable as an
	80	.Li unsigned char
	81	or the value of
	82	.Dv EOF .
	83	.Sh RETURN VALUES
	84	The
	85	.Fn isxdigit
	86	function returns zero if the character tests false and
	87	returns non-zero if the character tests true.
	88	.Sh COMPATIBILITY
	89	The
	90	.Bx 4.4
	91	extension of accepting arguments outside of the range of the
	92	.Vt "unsigned char"
	93	type in locales with large character sets is considered obsolete
	94	and may not be supported in future releases.
	95	The
	96	.Fn iswxdigit
	97	function should be used instead.
	98	.Sh SEE ALSO
	99	.Xr ctype 3 ,
	100	.Xr iswxdigit 3 ,
	101	.Xr multibyte 3 ,
	102	.Xr ascii 7
	103	.Sh STANDARDS
	104	The
	105	.Fn isxdigit
	106	function conforms to
	107	.St -isoC .
	108	.Sh HISTORY
	109	The
	110	.Fn ishexnumber
	111	function appeared in
	112	.Bx 4.4 .