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FUNCTION

	<>---control character predicate

	iscntrl

	#include 

	int iscntrl(int <[c]>);

	#include 

	int iscntrl(<[c]>);

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

lookup.  It is a predicate returning non-zero for control characters, 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 iscntrl>>'.

<> returns non-zero if <[c]> is a delete character or ordinary

control character (<<0x7F>> or <<0x00>>--<<0x1F>>).

<> is ANSI C.

*/

#include 

int

_DEFUN(iscntrl,(c),int c)

{

	return(__ctype_ptr__[c+1] & _C);

}