--- np2/io/gdc_sub.c	2004/02/21 00:25:33	1.17
+++ np2/io/gdc_sub.c	2004/06/02 11:02:53	1.18
@@ -179,7 +179,7 @@ void gdcsub_setvectl(GDCVECT *vect, int 
 			}
 		}
 	}
-	if (ope & 1) {
+	if (!((ope + 1) & 2)) {
 		tmp = dx;
 		dx = dy;
 		dy = tmp;