/*
 * Older parts Copyright (c) University of Toronto 1985-1993 and years
 * between.  All rights reserved.
 * Recent work Copyright (c) Geoffrey Collyer and Henry Spencer 1994.  All
 * rights reserved.
 * Written mostly by Geoffrey Collyer and Henry Spencer.
 *
 * This software is not subject to any license of the American Telephone
 * and Telegraph Company, the Regents of the University of California, or
 * the Free Software Foundation.
 *
 * Permission is granted to anyone to use this software for any purpose on
 * any computer system, and to alter it and redistribute it freely, subject
 * to the following restrictions:
 *
 * 1. The authors are not responsible for the consequences of use of this
 *    software, no matter how awful, even if they arise from flaws in it.
 *
 * 2. The origin of this software must not be misrepresented, either by
 *    explicit claim or by omission.  Since few users ever read sources,
 *    credits must appear in the documentation.
 *
 * 3. Altered versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.  Since few users
 *    ever read sources, credits must appear in the documentation.
 *
 * 4. This notice may not be removed or altered.
 *
 * We also ask that, if possible, all distributions retain the sponsorship
 * information in the README file and the sponsors directory.  These folks
 * have helped us out, and we want to see them get proper credit for it.
 */