int foo(int op)
{
	switch (op)
	{
		case 1: {
			do_something();
			return 0;
		}

		case 2:
			do_something_else();
			return 1;

		case 3:
		case 4:
			/* don't do anything */
			break;

		case 5:
			return 3;

		default:
			break;
	}

	return -1;
}