Libc-339.tar.gz

[apple/libc.git] / locale / FreeBSD / isxdigit.3

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.\"     @(#)isxdigit.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/locale/isxdigit.3,v 1.16 2002/10/06 10:15:38 tjr Exp $
.\"
.Dd October 6, 2002
.Dt ISXDIGIT 3
.Os
.Sh NAME
.Nm isxdigit, ishexnumber
.Nd hexadecimal-digit character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In ctype.h
.Ft int
.Fn isxdigit "int c"
.Ft int
.Fn ishexnumber "int c"
.Sh DESCRIPTION
The
.Fn isxdigit
function tests for any hexadecimal-digit character.
For any 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''"
.It "\&``A''\t``B''\t``C''\t``D''\t``E''"
.It "\&``F''\t``a''\t``b''\t``c''\t``d''"
.It "\&``e''\t``f''"
.El
.Pp
For single C
.Va char Ns s
locales (see
.Xr multibyte 3 )
the value of the argument is
representable as an
.Li unsigned char
or the value of
.Dv EOF .
.Sh RETURN VALUES
The
.Fn isxdigit
function returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh COMPATIBILITY
Although
.Fn isxdigit
and
.Fn ishexnumber
accept arguments outside of the range of the
.Vt "unsigned char"
type in locales with large character sets,
this is a
.Bx 4.4
extension and the
.Fn isxwdigit
and
.Fn iswhexnumber
functions should be used instead for maximum portability.
.Sh SEE ALSO
.Xr ctype 3 ,
.Xr iswxdigit 3 ,
.Xr multibyte 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isxdigit
function conforms to
.St -isoC .