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+.\" Copyright (c) 1991, 1993
+.\"	The Regents of the University of California.  All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the American National Standards Committee X3, on Information
+.\" Processing Systems.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     @(#)isdigit.3	8.1 (Berkeley) 6/4/93
+.\" $FreeBSD$
+.\"
+.Dd May 4, 2007
+.Dt ISDIGIT 3
+.Os
+.Sh NAME
+.Nm isdigit, isnumber
+.Nd decimal-digit character test
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In ctype.h
+.Ft int
+.Fn isdigit "int c"
+.Ft int
+.Fn isnumber "int c"
+.Sh DESCRIPTION
+The
+.Fn isdigit
+function tests for a decimal digit character.
+Regardless of locale, this includes the following characters only:
+.Pp
+.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______
+.It "\&``0''\t``1''\t``2''\t``3''\t``4''"
+.It "\&``5''\t``6''\t``7''\t``8''\t``9''"
+.El
+.Pp
+The
+.Fn isnumber
+function behaves similarly to
+.Fn isdigit ,
+but may recognize additional characters, depending on the current locale
+setting.
+.Pp
+The value of the argument must be representable as an
+.Vt "unsigned char"
+or the value of
+.Dv EOF .
+.Sh RETURN VALUES
+The
+.Fn isdigit
+and
+.Fn isnumber
+functions return zero if the character tests false and
+return non-zero if the character tests true.
+.Sh COMPATIBILITY
+The
+.Bx 4.4
+extension of accepting arguments outside of the range of the
+.Vt "unsigned char"
+type in locales with large character sets is considered obsolete
+and may not be supported in future releases.
+The
+.Fn iswdigit
+function should be used instead.
+.Sh SEE ALSO
+.Xr ctype 3 ,
+.Xr iswdigit 3 ,
+.Xr multibyte 3 ,
+.Xr ascii 7
+.Sh STANDARDS
+The
+.Fn isdigit
+function conforms to
+.St -isoC .
+.Sh HISTORY
+The
+.Fn isnumber
+function appeared in
+.Bx 4.4 .