--- kit.orig/draw.c	2012-10-14 20:25:10.000000000 +0200
+++ kit/draw.c	2016-01-12 18:01:53.090388852 +0100
@@ -1379,6 +1379,10 @@
 		}
 
 		q = draw_fragment(state, p, q - p, registry, charset16);
+		if (q == p) {
+			fprintf(stderr, "String '%s' too long for window!\n", p);
+			exit(1);
+		}
 
 		p = q;
 	}