/contrib/ntp/libparse/gpstolfp.c

https://bitbucket.org/freebsd/freebsd-head/ · C · 76 lines · 19 code · 4 blank · 53 comment · 1 complexity · 98ade79dd69ba910fb91c28545eb60d4 MD5 · raw file

  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. #define GPSORIGIN ULONG_CONST(2524953600) /* NTP origin - GPS origin in seconds */
  37. #define SECSPERWEEK (unsigned)(604800) /* seconds per week - GPS tells us about weeks */
  38. #define GPSWRAP 990 /* assume week count less than this in the previous epoch */
  39. void
  40. gpstolfp(
  41. int weeks,
  42. int days,
  43. unsigned long seconds,
  44. l_fp * lfp
  45. )
  46. {
  47. if (weeks < GPSWRAP)
  48. {
  49. weeks += 1024;
  50. }
  51. lfp->l_ui = weeks * SECSPERWEEK + days * 86400 + seconds + GPSORIGIN; /* convert to NTP time */
  52. lfp->l_uf = 0;
  53. }
  54. /*
  55. * History:
  56. *
  57. * gpstolfp.c,v
  58. * Revision 4.8 2005/04/16 17:32:10 kardel
  59. * update copyright
  60. *
  61. * Revision 4.7 2004/11/14 15:29:41 kardel
  62. * support PPSAPI, upgrade Copyright to Berkeley style
  63. *
  64. * Revision 4.3 1999/02/28 11:42:44 kardel
  65. * (GPSWRAP): update GPS rollover to 990 weeks
  66. *
  67. * Revision 4.2 1998/07/11 10:05:25 kardel
  68. * Release 4.0.73d reconcilation
  69. *
  70. * Revision 4.1 1998/06/28 16:47:15 kardel
  71. * added gpstolfp() function
  72. */