1 /*- 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Timothy C. Stoehr. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#)random.c 8.1 (Berkeley) 5/31/93 33 * $FreeBSD: src/games/rogue/random.c,v 1.6 1999/11/30 03:49:26 billf Exp $ 34 */ 35 36 #include "rogue.h" 37 38 /* 39 * random.c 40 * 41 * This source herein may be modified and/or distributed by anybody who 42 * so desires, with the following restrictions: 43 * 1.) No portion of this notice shall be removed. 44 * 2.) Credit shall not be taken for the creation of this source. 45 * 3.) This code is not to be traded, sold, or used for personal 46 * gain or profit. 47 * 48 */ 49 50 int 51 get_rand(int x, int y) 52 { 53 int r, t; 54 long lr; 55 56 if (x > y) { 57 t = y; 58 y = x; 59 x = t; 60 } 61 lr = rrandom(); 62 lr &= 0x00003fffL; 63 r = (int)lr; 64 r = (r % ((y - x) + 1)) + x; 65 return(r); 66 } 67 68 boolean 69 rand_percent(int percentage) 70 { 71 return(get_rand(1, 100) <= percentage); 72 } 73 74 boolean 75 coin_toss(void) 76 { 77 return(((rrandom() & 01) ? 1 : 0)); 78 } 79