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FUNCTION

<>---hexadecimal digit predicate

isxdigit

#include 

int isxdigit(int <[c]>);

#include 

int isxdigit(int <[c]>);

<> 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 if <[c]> is

representable as an unsigned char or if <[c]> is EOF.

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

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

(<<0>>--<<9>>, <>--<>, or <>--<>).

<> is ANSI C.

*/

#include <_ansi.h>

#include 

int

_DEFUN(isxdigit,(c),int c)

{

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

}