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/contrib/ntp/libparse/gpstolfp.c

https://bitbucket.org/freebsd/freebsd-head/
C | 76 lines | 19 code | 4 blank | 53 comment | 1 complexity | 98ade79dd69ba910fb91c28545eb60d4 MD5 | raw file
 1/*
 2 * /src/NTP/ntp4-dev/libntp/gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A
 3 *
 4 * gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A
 5 *
 6 * $Created: Sun Jun 28 16:30:38 1998 $
 7 *
 8 * Copyright (c) 1998-2005 by Frank Kardel <kardel <AT> ntp.org>
 9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the author nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 */
35#include "ntp_fp.h"
36
37#define GPSORIGIN	ULONG_CONST(2524953600)	/* NTP origin - GPS origin in seconds */
38#define SECSPERWEEK	(unsigned)(604800)	/* seconds per week - GPS tells us about weeks */
39#define GPSWRAP		990	/* assume week count less than this in the previous epoch */
40
41void
42gpstolfp(
43	 int weeks,
44	 int days,
45	 unsigned long  seconds,
46	 l_fp * lfp
47	 )
48{
49  if (weeks < GPSWRAP)
50    {
51      weeks += 1024;
52    }
53
54  lfp->l_ui = weeks * SECSPERWEEK + days * 86400 + seconds + GPSORIGIN; /* convert to NTP time */
55  lfp->l_uf = 0;
56}
57
58/*
59 * History:
60 *
61 * gpstolfp.c,v
62 * Revision 4.8  2005/04/16 17:32:10  kardel
63 * update copyright
64 *
65 * Revision 4.7  2004/11/14 15:29:41  kardel
66 * support PPSAPI, upgrade Copyright to Berkeley style
67 *
68 * Revision 4.3  1999/02/28 11:42:44  kardel
69 * (GPSWRAP): update GPS rollover to 990 weeks
70 *
71 * Revision 4.2  1998/07/11 10:05:25  kardel
72 * Release 4.0.73d reconcilation
73 *
74 * Revision 4.1  1998/06/28 16:47:15  kardel
75 * added gpstolfp() function
76 */