1 /* $NetBSD: gpstolfp.c,v 1.1.1.1 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 43 void 44 gpstolfp( 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