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/*

FUNCTION

<<isdigit>>---decimal digit predicate

INDEX

isdigit

ANSI_SYNOPSIS

#include <ctype.h>

int isdigit(int <[c]>);

TRAD_SYNOPSIS

#include <ctype.h>

int isdigit(<[c]>);

DESCRIPTION

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

lookup.  It is a predicate returning non-zero for decimal 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 isdigit>>'.

RETURNS

<<isdigit>> returns non-zero if <[c]> is a decimal digit (<<0>>--<<9>>).

PORTABILITY

<<isdigit>> is ANSI C.

No supporting OS subroutines are required.

*/

#include <_ansi.h>

#include <ctype.h>

#undef isdigit

int

_DEFUN(isdigit,(c),int c)

{

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

}