Clean up path_reverse()

1 files changed, 9 insertions, 6 deletions

diff --git a/path.c b/path.c
index 19a9aaa..15c7e31 100644
--- a/path.c
+++ b/path.c
@@ -332,6 +332,7 @@ void path_free(Path path, size_t height) {
 
 void path_reverse(Path *path, size_t width, size_t height, Position *start, Position *end) {
     Path new_path = path_new(width, height);
+    if (new_path == NULL) error("Failed to allocate path\n");
 
     Position cur = *end;
     while (cur.x != start->x || cur.y != start->y) {
@@ -341,16 +342,18 @@ void path_reverse(Path *path, size_t width, size_t height, Position *start, Posi
     }
 
     /* Switch start and end around */
-    start->x = start->x ^ end->x;
-    end->x   = start->x ^ end->x;
-    start->x = start->x ^ end->x;
+    start->x ^= end->x;
+    end->x   ^= start->x;
+    start->x ^= end->x;
 
-    start->y = start->y ^ end->y;
-    end->y   = start->y ^ end->y;
-    start->y = start->y ^ end->y;
+    start->y ^= end->y;
+    end->y   ^= start->y;
+    start->y ^= end->y;
 
     path_free(*path, height);
     *path = new_path;
+
+    return;
 }
 
 char **visited_new(size_t width, size_t height) {