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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	.\"
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	9	.\" modification, are permitted provided that the following conditions
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	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.
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	22	.\" without specific prior written permission.
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	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
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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	.\" @(#)isalpha.3 8.1 (Berkeley) 6/4/93
	37	.\" $FreeBSD: src/lib/libc/locale/isalpha.3,v 1.18 2004/08/21 07:37:08 tjr Exp $
	38	.\"
	39	.Dd August 21, 2004
	40	.Dt ISALPHA 3
	41	.Os
	42	.Sh NAME
	43	.Nm isalpha
	44	.Nd alphabetic character test
	45	.Sh LIBRARY
	46	.Lb libc
	47	.Sh SYNOPSIS
	48	.In ctype.h
	49	.Ft int
	50	.Fn isalpha "int c"
	51	.Sh DESCRIPTION
	52	The
	53	.Fn isalpha
	54	function tests for any character for which
	55	.Xr isupper 3
	56	or
	57	.Xr islower 3
	58	is true.
	59	For single C
	60	.Va char Ns s
	61	locales (see
	62	.Xr multibyte 3 )
	63	the value of the argument is
	64	representable as an
	65	.Li unsigned char
	66	or the value of
	67	.Dv EOF .
	68	In the ASCII character set, this includes the following characters
	69	(with their numeric values shown in octal):
	70	.Pp
	71	.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
	72	.It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
	73	.It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
	74	.It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
	75	.It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
	76	.It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
	77	.It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
	78	.It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
	79	.It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
	80	.It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
	81	.It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
	82	.It "\&171\ ``y'' \t172\ ``z''"
	83	.El
	84	.Sh RETURN VALUES
	85	The
	86	.Fn isalpha
	87	function returns zero if the character tests false and
	88	returns non-zero if the character tests true.
	89	.Sh COMPATIBILITY
	90	The
	91	.Bx 4.4
	92	extension of accepting arguments outside of the range of the
	93	.Vt "unsigned char"
	94	type in locales with large character sets is considered obsolete
	95	and may not be supported in future releases.
	96	The
	97	.Fn iswalpha
	98	function should be used instead.
	99	.Sh SEE ALSO
	100	.Xr ctype 3 ,
	101	.Xr islower 3 ,
	102	.Xr isupper 3 ,
	103	.Xr iswalpha 3 ,
	104	.Xr multibyte 3 ,
	105	.Xr ascii 7
	106	.Sh STANDARDS
	107	The
	108	.Fn isalpha
	109	function conforms to
	110	.St -isoC .