Make stairs work

src/rpg/world/tile.c

@@ -8,9 +8,28 @@
 #include "tile.h"
 
 bool_t tileIsWalkable(const tile_t tile) {
-  return (
-    tile == TILE_WALKABLE || 
-    tile == TILE_STAIRS_UP || 
-    tile == TILE_STAIRS_DOWN
-  );
+  switch(tile) {
+    case TILE_WALKABLE:
+    case TILE_STAIRS_NORTH:
+    case TILE_STAIRS_SOUTH:
+    case TILE_STAIRS_EAST:
+    case TILE_STAIRS_WEST:
+      return true;
+
+    default:
+      return false;
+  }
+}
+
+bool_t tileIsStairs(const tile_t tile) {
+  switch(tile) {
+    case TILE_STAIRS_NORTH:
+    case TILE_STAIRS_SOUTH:
+    case TILE_STAIRS_EAST:
+    case TILE_STAIRS_WEST:
+      return true;
+
+    default:
+      return false;
+  }
 }