/*
 * Copyright (c) 1985, 1986 by Geoffrey Collyer.
 * Written by Geoffrey Collyer.  Not derived from AT&T code.
 *
 * Permission is granted to anyone to use this software for any
 * purpose on any computer system, and to redistribute it freely,
 * subject to the following restrictions:
 *
 * 1. The author is not responsible for the consequences of use of
 *    this software, no matter how awful, even if they arise
 *    from imperfections in it.
 *
 * 2. The origin of this software must not be misrepresented, either
 *    by explicit claim or by omission.
 *
 * 3. Altered versions must be plainly marked as such, and must not
 *    be misrepresented as being the original software.
 */
