Working controls

1 files changed, 21 insertions, 1 deletions

diff --git a/src/ring.c b/src/ring.c
index 633648b..e73d477 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -19,8 +19,28 @@ void pickup_ring() {
 		}
 	}
 
-	if(pickup > 0) {
+	if(pickup >= 0) {
 		held = &rings[pickup];
 		held->held = true;
+		towers[hover].rings[pickup] = false;
 	}
 }
+
+bool drop_ring() {
+	int i;
+
+	// should not be called if we are not holding a ring
+	assert(held != NULL);
+
+	//determine if we are allowed to drop the ring here
+	for(i = 2; i > held->size; --i) {
+		if(towers[held->location].rings[i]) {
+			return false;
+		}
+	}
+
+	held->held = false;
+	towers[held->location].rings[i] = true;
+	held = NULL;
+	return true;
+}