112 lines
3.9 KiB
Groff
112 lines
3.9 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)isalpha.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd October 6, 2002
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.Dt ISALPHA 3
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.Os
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.Sh NAME
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.Nm isalpha
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.Nd alphabetic character test
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In ctype.h
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.Ft int
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.Fn isalpha "int c"
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.Sh DESCRIPTION
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The
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.Fn isalpha
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function tests for any character for which
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.Xr isupper 3
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or
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.Xr islower 3
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is true.
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For single C
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.Va char Ns s
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locales (see
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.Xr multibyte 3 )
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the value of the argument is
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representable as an
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.Li unsigned char
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or the value of
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.Dv EOF .
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In the ASCII character set, this includes the following characters
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(with their numeric values shown in octal):
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.Pp
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.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
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.It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
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.It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
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.It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
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.It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
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.It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
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.It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
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.It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
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.It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
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.It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
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.It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
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.It "\&171\ ``y'' \t172\ ``z''"
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.El
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.Sh RETURN VALUES
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The
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.Fn isalpha
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function returns zero if the character tests false and
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returns non-zero if the character tests true.
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.Sh COMPATIBILITY
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Although
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.Fn isalpha
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accepts arguments outside of the range of the
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.Vt "unsigned char"
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type in locales with large character sets,
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this is a
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.Bx 4.4
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extension and the
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.Fn iswalpha
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function should be used instead for maximum portability.
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.Sh SEE ALSO
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.Xr ctype 3 ,
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.Xr islower 3 ,
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.Xr isupper 3 ,
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.Xr iswalpha 3 ,
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.Xr multibyte 3 ,
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.Xr ascii 7
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.Sh STANDARDS
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The
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.Fn isalpha
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function conforms to
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.St -isoC .
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