1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 static char copyright[] = 38 "@(#) Copyright (c) 1992, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif /* not lint */ 41 42 #if defined(LIBC_SCCS) && !defined(lint) 43 static char sccsid[] = "@(#)mul.c 8.1 (Berkeley) 6/4/93"; 44 #endif /* LIBC_SCCS and not lint */ 45 #include <sys/cdefs.h> 46 __FBSDID("$FreeBSD$"); 47 48 #include <stdio.h> 49 50 main() 51 { 52 union { long long q; unsigned long v[2]; } a, b, m; 53 char buf[300]; 54 extern long long __muldi3(long long, long long); 55 56 for (;;) { 57 printf("> "); 58 if (fgets(buf, sizeof buf, stdin) == NULL) 59 break; 60 if (sscanf(buf, "%lu:%lu %lu:%lu", 61 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4 && 62 sscanf(buf, "0x%lx:%lx 0x%lx:%lx", 63 &a.v[0], &a.v[1], &b.v[0], &b.v[1]) != 4) { 64 printf("eh?\n"); 65 continue; 66 } 67 m.q = __muldi3(a.q, b.q); 68 printf("%lx:%lx * %lx:%lx => %lx:%lx\n", 69 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 70 printf(" = %lX%08lX * %lX%08lX => %lX%08lX\n", 71 a.v[0], a.v[1], b.v[0], b.v[1], m.v[0], m.v[1]); 72 } 73 exit(0); 74 } 75