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FUNCTION

<>---uppercase character predicate

isupper

#include 

int isupper(int <[c]>);

#include 

int isupper(<[c]>);

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

lookup.  It is a predicate returning non-zero for uppercase letters

(<>--<>), and 0 for other characters.  It is defined only when

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

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

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

<> is ANSI C.

*/

#include <_ansi.h>

#include 

int

_DEFUN(isupper,(c),int c)

{

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

}