Fix tpu source rendering and tpu location duplicates

1 files changed, 3 insertions, 1 deletions

diff --git a/tpu.c b/tpu.c
index 7b14b25..f3a5b90 100644
--- a/tpu.c
+++ b/tpu.c
@@ -580,18 +580,20 @@ tpu_map_link_pos(struct tpu_map *map, int x, int y)
 	return link;
 }
 
-void
+bool
 tpu_map_add(struct tpu_map *map, struct tpu *tpu)
 {
 	struct tpu_map_link **pos, *link;
 
 	pos = tpu_map_link_pos(map, tpu->x, tpu->y);
+	if (*pos) return false;
 	*pos = link = malloc(sizeof(struct tpu_map_link));
 	if (!link) die("malloc:");
 	link->tpu = tpu;
 	link->x = tpu->x;
 	link->y = tpu->y;
 	link->next = NULL;
+	return true;
 }
 
 struct tpu *