1 /* $NetBSD: mul.c,v 1.2 1995/02/27 17:31:34 cgd Exp $ */ 2 3 /*- 4 * Copyright (c) 1992, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This software was developed by the Computer Systems Engineering group 8 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 9 * contributed to Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the University of 22 * California, Berkeley and its contributors. 23 * 4. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 */ 39 40 #ifndef lint 41 static char copyright[] = 42 "@(#) Copyright (c) 1992, 1993\n\ 43 The Regents of the University of California. All rights reserved.\n"; 44 #endif /* not lint */ 45 46 #ifndef lint 47 #if 0 48 static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93"; 49 #else 50 static char rcsid[] = "$NetBSD: mul.c,v 1.2 1995/02/27 17:31:34 cgd Exp $"; 51 #endif 52 #endif /* not lint */ 53 54 #include <stdio.h> 55 56 main() 57 { 58 union { long long q; unsigned long v[2]; } a, b, m; 59 char buf[300]; 60 extern long long __muldi3(long long, long long); 61 62 for (;;) { 63 printf("> "); 64 if (fgets(buf, sizeof buf, stdin) == NULL) 65 break; 66 if (sscanf(buf, "%lu:%lu %lu:%lu", 67 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 && 68 sscanf(buf, "0x%lx:%lx 0x%lx:%lx", 69 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) { 70 printf("eh?\n"); 71 continue; 72 } 73 m.q = __muldi3(a.q, b.q); 74 printf("%lx:%lx * %lx:%lx => %lx:%lx\n", 75 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 76 printf(" = %lX%08lX * %lX%08lX => %lX%08lX\n", 77 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 78 } 79 exit(0); 80 } 81