Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / isalpha.3
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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
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18.\" This product includes software developed by the University of
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20.\" 4. Neither the name of the University nor the names of its contributors
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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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35.\"
36.\" @(#)isalpha.3 8.1 (Berkeley) 6/4/93
37.\" $FreeBSD: src/lib/libc/locale/isalpha.3,v 1.7.2.6 2001/12/14 18:33:54 ru Exp $
9cbd208e 38.\" $DragonFly: src/lib/libc/gen/isalpha.3,v 1.3 2006/04/08 08:57:00 swildner Exp $
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39.\"
40.Dd June 4, 1993
41.Dt ISALPHA 3
42.Os
43.Sh NAME
44.Nm isalpha
45.Nd alphabetic character test
46.Sh LIBRARY
47.Lb libc
48.Sh SYNOPSIS
49.In ctype.h
50.Ft int
51.Fn isalpha "int c"
52.Sh DESCRIPTION
53The
54.Fn isalpha
55function tests for any character for which
56.Xr isupper 3
57or
58.Xr islower 3
59is true.
60For single C
61.Va char Ns s
9cbd208e 62locales the value of the argument is
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63representable as an
64.Li unsigned char
65or the value of
66.Dv EOF .
67In the ASCII character set, this includes the following characters
68(with their numeric values shown in octal):
69.Pp
70.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
71.It "\&101\ ``A'' \t102\ ``B'' \t103\ ``C'' \t104\ ``D'' \t105\ ``E''"
72.It "\&106\ ``F'' \t107\ ``G'' \t110\ ``H'' \t111\ ``I'' \t112\ ``J''"
73.It "\&113\ ``K'' \t114\ ``L'' \t115\ ``M'' \t116\ ``N'' \t117\ ``O''"
74.It "\&120\ ``P'' \t121\ ``Q'' \t122\ ``R'' \t123\ ``S'' \t124\ ``T''"
75.It "\&125\ ``U'' \t126\ ``V'' \t127\ ``W'' \t130\ ``X'' \t131\ ``Y''"
76.It "\&132\ ``Z'' \t141\ ``a'' \t142\ ``b'' \t143\ ``c'' \t144\ ``d''"
77.It "\&145\ ``e'' \t146\ ``f'' \t147\ ``g'' \t150\ ``h'' \t151\ ``i''"
78.It "\&152\ ``j'' \t153\ ``k'' \t154\ ``l'' \t155\ ``m'' \t156\ ``n''"
79.It "\&157\ ``o'' \t160\ ``p'' \t161\ ``q'' \t162\ ``r'' \t163\ ``s''"
80.It "\&164\ ``t'' \t165\ ``u'' \t166\ ``v'' \t167\ ``w'' \t170\ ``x''"
81.It "\&171\ ``y'' \t172\ ``z''"
82.El
83.Sh RETURN VALUES
84The
85.Fn isalpha
86function returns zero if the character tests false and
87returns non-zero if the character tests true.
88.Sh SEE ALSO
89.Xr ctype 3 ,
90.Xr islower 3 ,
91.Xr isupper 3 ,
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92.Xr ascii 7
93.Sh STANDARDS
94The
95.Fn isalpha
96function conforms to
97.St -isoC .