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1.\" Copyright (c) 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
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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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8.\" Redistribution and use in source and binary forms, with or without
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.
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16.\" 4. Neither the name of the University nor the names of its contributors
17.\" may be used to endorse or promote products derived from this software
18.\" without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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31.\"
5b2abdfb 32.\" @(#)isdigit.3 8.1 (Berkeley) 6/4/93
1f2f436a 33.\" $FreeBSD: src/lib/libc/locale/isdigit.3,v 1.25 2009/09/04 07:44:58 des Exp $
e9ce8d39 34.\"
1f2f436a 35.Dd May 4, 2007
5b2abdfb 36.Dt ISDIGIT 3
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37.Os
38.Sh NAME
9385eb3d 39.Nm isdigit, isnumber
5b2abdfb 40.Nd decimal-digit character test
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41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
5b2abdfb 44.In ctype.h
e9ce8d39 45.Ft int
5b2abdfb 46.Fn isdigit "int c"
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47.Ft int
48.Fn isnumber "int c"
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49.Sh DESCRIPTION
50The
5b2abdfb 51.Fn isdigit
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52function tests for a decimal digit character.
53Regardless of locale, this includes the following characters only:
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54.Pp
55.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______
56.It "\&``0''\t``1''\t``2''\t``3''\t``4''"
57.It "\&``5''\t``6''\t``7''\t``8''\t``9''"
58.El
59.Pp
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60The
61.Fn isnumber
62function behaves similarly to
63.Fn isdigit ,
64but may recognize additional characters, depending on the current locale
65setting.
66.Pp
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67The value of the argument must be representable as an
68.Vt "unsigned char"
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69or the value of
70.Dv EOF .
e9ce8d39 71.Sh RETURN VALUES
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72The
73.Fn isdigit
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74and
75.Fn isnumber
76functions return zero if the character tests false and
1f2f436a 77return non-zero if the character tests true.
9385eb3d 78.Sh COMPATIBILITY
3d9156a7 79The
9385eb3d 80.Bx 4.4
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81extension of accepting arguments outside of the range of the
82.Vt "unsigned char"
83type in locales with large character sets is considered obsolete
84and may not be supported in future releases.
85The
9385eb3d 86.Fn iswdigit
3d9156a7 87function should be used instead.
e9ce8d39 88.Sh SEE ALSO
5b2abdfb 89.Xr ctype 3 ,
ad3c9f2a 90.Xr isalnum_l 3 ,
9385eb3d 91.Xr iswdigit 3 ,
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92.Xr multibyte 3 ,
93.Xr ascii 7
94.Sh STANDARDS
e9ce8d39 95The
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96.Fn isdigit
97function conforms to
98.St -isoC .
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99.Sh HISTORY
100The
101.Fn isnumber
102function appeared in
103.Bx 4.4 .