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Annotation of embedaddon/ntp/libparse/gpstolfp.c, revision 1.1.1.1

1.1       misho       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      2524953600UL    /* 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: 
                     41: void
                     42: gpstolfp(
                     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:  */