gpstolfp.c revision 181834
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 */ 77