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Annotation of embedaddon/ntp/libparse/gpstolfp.c, revision 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:  */