err = err | write_uint8(world->player->hitpoints, file);
err = err | write_map_objects(world, world->monster, file);
err = err | write_map_objects(world, world->item, file);
err = err | write_uint8(world->player->hitpoints, file);
err = err | write_map_objects(world, world->monster, file);
err = err | write_map_objects(world, world->item, file);