Merge from vendor branch BZIP:
[dragonfly.git] / lib / libc / gen / isdigit.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.\"
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
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33.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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35.\"
36.\" @(#)isdigit.3 8.1 (Berkeley) 6/4/93
37.\" $FreeBSD: src/lib/libc/locale/isdigit.3,v 1.6.2.5 2001/12/14 18:33:54 ru Exp $
9cbd208e 38.\" $DragonFly: src/lib/libc/gen/isdigit.3,v 1.3 2006/04/08 08:57:00 swildner Exp $
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39.\"
40.Dd June 4, 1993
41.Dt ISDIGIT 3
42.Os
43.Sh NAME
44.Nm isdigit
45.Nd decimal-digit character test
46.Sh LIBRARY
47.Lb libc
48.Sh SYNOPSIS
49.In ctype.h
50.Ft int
51.Fn isdigit "int c"
52.Sh DESCRIPTION
53The
54.Fn isdigit
55function tests for any decimal-digit character.
56For single C
57.Va char Ns s
9cbd208e 58locales the value of the argument is
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59representable as an
60.Li unsigned char
61or the value of
62.Dv EOF .
63In the ASCII character set, this includes the following characters
64(with their numeric values shown in octal):
65.Pp
66.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
67.It "\&060\ ``0'' \t061\ ``1'' \t062\ ``2'' \t063\ ``3'' \t064\ ``4''"
68.It "\&065\ ``5'' \t066\ ``6'' \t067\ ``7'' \t070\ ``8'' \t071\ ``9''"
69.El
70.Sh RETURN VALUES
71The
72.Fn isdigit
73function returns zero if the character tests false and
74returns non-zero if the character tests true.
75.Sh SEE ALSO
76.Xr ctype 3 ,
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77.Xr ascii 7
78.Sh STANDARDS
79The
80.Fn isdigit
81function conforms to
82.St -isoC .