gpstolfp.c revision 1.1 
1/*	$NetBSD: gpstolfp.c,v 1.1 2009/12/13 16:55:24 kardel Exp $	*/
2
3/*
4 * /src/NTP/ntp4-dev/libntp/gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A
5 *
6 * gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A
7 *
8 * Created: Sun Jun 28 16:30:38 1998
9 *
10 * Copyright (c) 1998-2005 by Frank Kardel <kardel <AT> ntp.org>
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the author nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37#include "ntp_fp.h"
38
39#define GPSORIGIN	2524953600UL	/* NTP origin - GPS origin in seconds */
40#define SECSPERWEEK	(unsigned)(604800)	/* seconds per week - GPS tells us about weeks */
41#define GPSWRAP		990	/* assume week count less than this in the previous epoch */
42
43void
44gpstolfp(
45	 int weeks,
46	 int days,
47	 unsigned long  seconds,
48	 l_fp * lfp
49	 )
50{
51  if (weeks < GPSWRAP)
52    {
53      weeks += 1024;
54    }
55
56  lfp->l_ui = weeks * SECSPERWEEK + days * 86400 + seconds + GPSORIGIN; /* convert to NTP time */
57  lfp->l_uf = 0;
58}
59
60/*
61 * History:
62 *
63 * gpstolfp.c,v
64 * Revision 4.8  2005/04/16 17:32:10  kardel
65 * update copyright
66 *
67 * Revision 4.7  2004/11/14 15:29:41  kardel
68 * support PPSAPI, upgrade Copyright to Berkeley style
69 *
70 * Revision 4.3  1999/02/28 11:42:44  kardel
71 * (GPSWRAP): update GPS rollover to 990 weeks
72 *
73 * Revision 4.2  1998/07/11 10:05:25  kardel
74 * Release 4.0.73d reconcilation
75 *
76 * Revision 4.1  1998/06/28 16:47:15  kardel
77 * added gpstolfp() function
78 */
79