1*86d7f5d3SJohn Marino /*
2*86d7f5d3SJohn Marino * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3*86d7f5d3SJohn Marino * All rights reserved.
4*86d7f5d3SJohn Marino *
5*86d7f5d3SJohn Marino * Redistribution and use in source and binary forms, with or without
6*86d7f5d3SJohn Marino * modification, are permitted provided that the following conditions
7*86d7f5d3SJohn Marino * are met:
8*86d7f5d3SJohn Marino * 1. Redistributions of source code must retain the above copyright
9*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer.
10*86d7f5d3SJohn Marino * 2. Redistributions in binary form must reproduce the above copyright
11*86d7f5d3SJohn Marino * notice, this list of conditions and the following disclaimer in the
12*86d7f5d3SJohn Marino * documentation and/or other materials provided with the distribution.
13*86d7f5d3SJohn Marino * 3. Neither the name of the project nor the names of its contributors
14*86d7f5d3SJohn Marino * may be used to endorse or promote products derived from this software
15*86d7f5d3SJohn Marino * without specific prior written permission.
16*86d7f5d3SJohn Marino *
17*86d7f5d3SJohn Marino * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
18*86d7f5d3SJohn Marino * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*86d7f5d3SJohn Marino * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*86d7f5d3SJohn Marino * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
21*86d7f5d3SJohn Marino * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*86d7f5d3SJohn Marino * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*86d7f5d3SJohn Marino * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*86d7f5d3SJohn Marino * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*86d7f5d3SJohn Marino * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*86d7f5d3SJohn Marino * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*86d7f5d3SJohn Marino * SUCH DAMAGE.
28*86d7f5d3SJohn Marino *
29*86d7f5d3SJohn Marino * $FreeBSD: src/usr.sbin/route6d/misc/cksum.c,v 1.1 1999/12/28 02:37:10 shin Exp $
30*86d7f5d3SJohn Marino * $DragonFly: src/usr.sbin/route6d/misc/cksum.c,v 1.3 2005/12/05 02:40:28 swildner Exp $
31*86d7f5d3SJohn Marino */
32*86d7f5d3SJohn Marino
33*86d7f5d3SJohn Marino #include <stdio.h>
34*86d7f5d3SJohn Marino
35*86d7f5d3SJohn Marino unsigned short buf[BUFSIZ];
36*86d7f5d3SJohn Marino
37*86d7f5d3SJohn Marino int
main(void)38*86d7f5d3SJohn Marino main(void)
39*86d7f5d3SJohn Marino {
40*86d7f5d3SJohn Marino int i;
41*86d7f5d3SJohn Marino unsigned short *p = buf, *q = &buf[4];
42*86d7f5d3SJohn Marino unsigned long sum, sum2;
43*86d7f5d3SJohn Marino
44*86d7f5d3SJohn Marino while (scanf("%x", &i) != EOF) {
45*86d7f5d3SJohn Marino *p++ = i; printf("%d ", i);
46*86d7f5d3SJohn Marino }
47*86d7f5d3SJohn Marino printf("\n");
48*86d7f5d3SJohn Marino
49*86d7f5d3SJohn Marino sum = buf[2] + (buf[3] >> 8) & 0xff;
50*86d7f5d3SJohn Marino while (q != p)
51*86d7f5d3SJohn Marino sum += (*q++ & 0xffff);
52*86d7f5d3SJohn Marino sum2 = (sum & 0xffff) + (sum >> 16) & 0xffff;
53*86d7f5d3SJohn Marino printf("%x, %x\n", sum, sum2);
54*86d7f5d3SJohn Marino }
55