Allow spawn rate option to work as intended

src/engine.c

@@ -183,6 +183,9 @@ void gamestate_new_block(struct gamestate *g)
         srand(time(NULL));
     }
 
+    /* Exit early if there are no spaces to place a block */
+    if (g->blocks_in_play == g->gridsize) return;
+
     /* Fix up this random number generator */
     /* Method:
      *  -   Find a non-biased index between 0 and blocks_play, n
@@ -252,6 +255,11 @@ struct gamestate* gamestate_init(struct gameoptions *opt)
     g->blocks_in_play = 0;
     g->opts = opt;
 
+    /* Clamp spawn rate to maximum to avoid possible excessive calculation
+     * int generation of blocks */
+    if (g->opts->spawn_rate > g->gridsize)
+        g->opts->spawn_rate = g->gridsize;
+
     highscore_load(g);
 
     /* Initial 3 random blocks */

src/main.c

@@ -47,18 +47,18 @@ get_new_key:;
 
         /* Game will only end if 0 moves available */
         if (game_running) {
-            /* Maybe change this behaviour so if we don't move, we still generate a block */
-            if (gamestate_tick(s, g, direction, g->opts->animate ? draw_then_sleep : NULL))
+            gamestate_tick(s, g, direction, g->opts->animate ? draw_then_sleep : NULL);
+
+            int spawned;
+            for (spawned = 0; spawned < g->opts->spawn_rate; spawned++)
                 gamestate_new_block(g);
 
             if (gamestate_end_condition(g)) {
                 game_running = false;
-                goto game_end;
             }
         }
     }
 
-game_end:
     gfx_destroy(s);
     gamestate_clear(g);
     return 0;