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/*

FUNCTION

<<isxdigit>>---hexadecimal digit predicate

INDEX

isxdigit

ANSI_SYNOPSIS

#include <ctype.h>

int isxdigit(int <[c]>);

TRAD_SYNOPSIS

#include <ctype.h>

int isxdigit(int <[c]>);

DESCRIPTION

<<isxdigit>> is a macro which classifies ASCII integer values by table

lookup.  It is a predicate returning non-zero for hexadecimal digits,

and <<0>> for other characters.  It is defined only when

<<isascii>>(<[c]>) is true or <[c]> is EOF.

You can use a compiled subroutine instead of the macro definition by

undefining the macro using `<<#undef isxdigit>>'.

RETURNS

<<isxdigit>> returns non-zero if <[c]> is a hexadecimal digit

(<<0>>--<<9>>, <<a>>--<<f>>, or <<A>>--<<F>>).

PORTABILITY

<<isxdigit>> is ANSI C.

No supporting OS subroutines are required.

*/

#include <_ansi.h>

#include <ctype.h>

#undef isxdigit

int

_DEFUN(isxdigit,(c),int c)

{

        return((_ctype_ + 1)[c] & ((_X)|(_N)));

}