1994-05-27 05:00:24 +00:00
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.\" 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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2017-02-28 23:42:47 +00:00
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.\" 3. Neither the name of the University nor the names of its contributors
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1994-05-27 05:00:24 +00:00
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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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.\" @(#)isdigit.3 8.1 (Berkeley) 6/4/93
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1999-08-28 00:22:10 +00:00
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.\" $FreeBSD$
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1994-05-27 05:00:24 +00:00
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.\"
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2009-09-04 07:44:58 +00:00
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.Dd May 4, 2007
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1994-05-27 05:00:24 +00:00
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.Dt ISDIGIT 3
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.Os
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.Sh NAME
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2018-04-17 09:05:46 +00:00
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.Nm isdigit ,
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.Nm isnumber
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1994-05-27 05:00:24 +00:00
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.Nd decimal-digit character test
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2000-04-21 09:42:15 +00:00
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.Sh LIBRARY
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.Lb libc
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1994-05-27 05:00:24 +00:00
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.Sh SYNOPSIS
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2001-10-01 16:09:29 +00:00
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.In ctype.h
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1994-05-27 05:00:24 +00:00
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.Ft int
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1997-04-13 12:55:36 +00:00
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.Fn isdigit "int c"
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2002-01-09 13:43:31 +00:00
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.Ft int
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.Fn isnumber "int c"
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2012-03-13 20:02:41 +00:00
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.Ft int
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.Fn isdigit_l "int c" "locale_t loc"
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.Ft int
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.Fn isnumber_l "int c" "locale_t loc"
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1994-05-27 05:00:24 +00:00
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.Sh DESCRIPTION
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The
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.Fn isdigit
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2004-03-30 07:02:04 +00:00
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function tests for a decimal digit character.
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Regardless of locale, this includes the following characters only:
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2001-11-29 15:23:46 +00:00
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.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______
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2012-04-07 09:05:30 +00:00
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.It "\&``0''" Ta "``1''" Ta "``2''" Ta "``3''" Ta "``4''"
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.It "\&``5''" Ta "``6''" Ta "``7''" Ta "``8''" Ta "``9''"
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2001-11-29 15:23:46 +00:00
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.El
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.Pp
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2004-03-30 07:02:04 +00:00
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The
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.Fn isnumber
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function behaves similarly to
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.Fn isdigit ,
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but may recognize additional characters, depending on the current locale
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setting.
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.Pp
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2005-07-17 04:11:06 +00:00
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The value of the argument must be representable as an
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2005-11-17 13:00:00 +00:00
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.Vt "unsigned char"
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2000-04-11 14:41:37 +00:00
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or the value of
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.Dv EOF .
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2012-03-13 20:02:41 +00:00
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.Pp
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The _l-suffixed versions take an explicit locale argument, whereas the
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non-suffixed versions use the current global or per-thread locale.
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1994-05-27 05:00:24 +00:00
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.Sh RETURN VALUES
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The
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.Fn isdigit
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2004-03-30 07:02:04 +00:00
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and
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.Fn isnumber
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functions return zero if the character tests false and
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2007-05-04 16:01:07 +00:00
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return non-zero if the character tests true.
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2002-10-06 10:15:38 +00:00
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.Sh COMPATIBILITY
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2004-07-29 23:32:41 +00:00
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The
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2002-10-06 10:15:38 +00:00
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.Bx 4.4
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2004-07-29 23:32:41 +00:00
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extension of accepting arguments outside of the range of the
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.Vt "unsigned char"
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2004-08-21 07:37:08 +00:00
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type in locales with large character sets is considered obsolete
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and may not be supported in future releases.
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2004-07-29 23:32:41 +00:00
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The
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2002-10-06 10:15:38 +00:00
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.Fn iswdigit
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2004-08-21 07:37:08 +00:00
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function should be used instead.
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1994-05-27 05:00:24 +00:00
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.Sh SEE ALSO
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.Xr ctype 3 ,
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2002-10-06 10:15:38 +00:00
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.Xr iswdigit 3 ,
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2000-04-11 14:41:37 +00:00
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.Xr multibyte 3 ,
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2012-03-13 20:02:41 +00:00
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.Xr xlocale 3 ,
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1994-05-27 05:00:24 +00:00
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.Xr ascii 7
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.Sh STANDARDS
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The
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.Fn isdigit
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function conforms to
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2001-02-26 13:23:47 +00:00
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.St -isoC .
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2012-03-13 20:02:41 +00:00
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The
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.Fn isdigit_l
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function conforms to
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.St -p1003.1-2008 .
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2004-03-30 07:02:04 +00:00
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.Sh HISTORY
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The
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.Fn isnumber
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function appeared in
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.Bx 4.4 .
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