From 20d013c401539685572397e327606d68f4fac249 Mon Sep 17 00:00:00 2001
From: hasufell <hasufell@hasufell.de>
Date: Mon, 12 May 2014 19:49:01 +0200
Subject: [PATCH] Improve error handling in copy_vector()

---
 src/vector.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/vector.c b/src/vector.c
index f7aa64c..60d0c10 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -156,7 +156,7 @@ bool normalize_vector(vector *a, vector *b)
  */
 bool copy_vector(vector *a, vector *b)
 {
-	if (!a || !b)
+	if (!a || !b || (a == b))
 		return false;
 
 	b->x = a->x;