Annotation of embedaddon/ntp/libparse/gpstolfp.c, revision 1.1.1.1
1.1 misho 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 2524953600UL /* 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:
41: void
42: gpstolfp(
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: */
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