dist/ntp/libparse/gpstolfp.c

   1 /*      $NetBSD$        */
   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       ULONG_CONST(2524953600) /* 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  */