1 * Copyright (c) 1980,1986,1988,1990 The Regents of the University of California. 2 * All rights reserved. 3 * 4 * Redistribution and use in source and binary forms are permitted 5 * provided that: (1) source distributions retain this entire copyright 6 * notice and comment, and (2) distributions including binaries display 7 * the following acknowledgement: ``This product includes software 8 * developed by the University of California, Berkeley and its contributors'' 9 * in the documentation or other materials provided with the distribution 10 * and in all advertising materials mentioning features or use of this 11 * software. Neither the name of the University nor the names of its 12 * contributors may be used to endorse or promote products derived 13 * from this software without specific prior written permission. 14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 17