gpstolfp.c revision 181834
1181834Sroberto/* 2181834Sroberto * /src/NTP/ntp4-dev/libntp/gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A 3181834Sroberto * 4181834Sroberto * gpstolfp.c,v 4.8 2005/04/16 17:32:10 kardel RELEASE_20050508_A 5181834Sroberto * 6181834Sroberto * $Created: Sun Jun 28 16:30:38 1998 $ 7181834Sroberto * 8181834Sroberto * Copyright (c) 1998-2005 by Frank Kardel <kardel <AT> ntp.org> 9181834Sroberto * 10181834Sroberto * Redistribution and use in source and binary forms, with or without 11181834Sroberto * modification, are permitted provided that the following conditions 12181834Sroberto * are met: 13181834Sroberto * 1. Redistributions of source code must retain the above copyright 14181834Sroberto * notice, this list of conditions and the following disclaimer. 15181834Sroberto * 2. Redistributions in binary form must reproduce the above copyright 16181834Sroberto * notice, this list of conditions and the following disclaimer in the 17181834Sroberto * documentation and/or other materials provided with the distribution. 18181834Sroberto * 3. Neither the name of the author nor the names of its contributors 19181834Sroberto * may be used to endorse or promote products derived from this software 20181834Sroberto * without specific prior written permission. 21181834Sroberto * 22181834Sroberto * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23181834Sroberto * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24181834Sroberto * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25181834Sroberto * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26181834Sroberto * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27181834Sroberto * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28181834Sroberto * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29181834Sroberto * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30181834Sroberto * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31181834Sroberto * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32181834Sroberto * SUCH DAMAGE. 33181834Sroberto * 34181834Sroberto */ 35181834Sroberto#include "ntp_fp.h" 36181834Sroberto 37181834Sroberto#define GPSORIGIN ULONG_CONST(2524953600) /* NTP origin - GPS origin in seconds */ 38181834Sroberto#define SECSPERWEEK (unsigned)(604800) /* seconds per week - GPS tells us about weeks */ 39181834Sroberto#define GPSWRAP 990 /* assume week count less than this in the previous epoch */ 40181834Sroberto 41181834Srobertovoid 42181834Srobertogpstolfp( 43181834Sroberto int weeks, 44181834Sroberto int days, 45181834Sroberto unsigned long seconds, 46181834Sroberto l_fp * lfp 47181834Sroberto ) 48181834Sroberto{ 49181834Sroberto if (weeks < GPSWRAP) 50181834Sroberto { 51181834Sroberto weeks += 1024; 52181834Sroberto } 53181834Sroberto 54181834Sroberto lfp->l_ui = weeks * SECSPERWEEK + days * 86400 + seconds + GPSORIGIN; /* convert to NTP time */ 55181834Sroberto lfp->l_uf = 0; 56181834Sroberto} 57181834Sroberto 58181834Sroberto/* 59181834Sroberto * History: 60181834Sroberto * 61181834Sroberto * gpstolfp.c,v 62181834Sroberto * Revision 4.8 2005/04/16 17:32:10 kardel 63181834Sroberto * update copyright 64181834Sroberto * 65181834Sroberto * Revision 4.7 2004/11/14 15:29:41 kardel 66181834Sroberto * support PPSAPI, upgrade Copyright to Berkeley style 67181834Sroberto * 68181834Sroberto * Revision 4.3 1999/02/28 11:42:44 kardel 69181834Sroberto * (GPSWRAP): update GPS rollover to 990 weeks 70181834Sroberto * 71181834Sroberto * Revision 4.2 1998/07/11 10:05:25 kardel 72181834Sroberto * Release 4.0.73d reconcilation 73181834Sroberto * 74181834Sroberto * Revision 4.1 1998/06/28 16:47:15 kardel 75181834Sroberto * added gpstolfp() function 76181834Sroberto */ 77