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FUNCTION

<>---lowercase character predicate

islower

#include 

int islower(int <[c]>);

#include 

int islower(<[c]>);

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

lookup.  It is a predicate returning non-zero for minuscules

(lowercase alphabetic 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 islower>>'.

<> returns non-zero if <[c]> is a lowercase letter (<>--<>).

<> is ANSI C.

*/

#include <_ansi.h>

#include 

int

_DEFUN(islower,(c),int c)

{

	return ((__ctype_ptr__[c+1] & (_U|_L)) == _L);

}