ReadMME.c
Author: cmaier@cmassoc.net

    /*====================================================================*
     *
     *   Copyright (c) 2013 Qualcomm Atheros, Inc.
     *
     *   All rights reserved.
     *
     *   Redistribution and use in source and binary forms, with or
     *   without modification, are permitted (subject to the limitations
     *   in the disclaimer below) provided that the following conditions
     *   are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *
     *   * Redistributions in binary form must reproduce the above
     *     copyright notice, this list of conditions and the following
     *     disclaimer in the documentation and/or other materials
     *     provided with the distribution.
     *
     *   * Neither the name of Qualcomm Atheros nor the names of
     *     its contributors may be used to endorse or promote products
     *     derived from this software without specific prior written
     *     permission.
     *
     *   NO EXPRESS OR IMPLIED LICENSES TO ANY PARTY'S PATENT RIGHTS ARE
     *   GRANTED BY THIS LICENSE. THIS SOFTWARE IS PROVIDED BY THE
     *   COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
     *   IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     *   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     *   PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
     *   OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     *   NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     *   HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     *   CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
     *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
     *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     *--------------------------------------------------------------------*/

    /*====================================================================*
     *
     *   signed ReadMME (struct plc * plc, uint8_t MMV, uint16_t MMTYPE);
     *
     *   plc.h
     *
     *   wait for a QCA vendor specific message of given MMV and MMTYPE;
     *   discard unwanted messages until the desired message arrives or
     *   the channel timeout expires; return packetsize on success, 0 on
     *   timeout or -1 on error;
     *
     *   see SendMME for the send counterpart to this function;
     *
     *   a well designed UnwantedMessage function is critical here;
     *
     *
     *   Contributor(s):
     *      Charles Maier <cmaier@qca.qualcomm.com>
     *      Nathaniel Houghton <nhoughto@qca.qualcomm.com>
     *      Matthieu Poullet <m.poullet@avm.de>
     *
     *--------------------------------------------------------------------*/

    #ifndef READMME_SOURCE
    #define READMME_SOURCE

    #include <sys/time.h>

    #include <stdint.h>
    #include <memory.h>
    #include <errno.h>

    #include "../tools/error.h"
    #include "../tools/timer.h"
    #include "../plc/plc.h"
    #include "../mme/mme.h"

    signed ReadMME (struct plc * plc, uint8_t MMV, uint16_t MMTYPE)

    {
    	struct channel * channel = (struct channel *)(plc->channel);
    	struct message * message = (struct message *)(plc->message);
    	struct timeval ts;
    	struct timeval tc;
    	if (gettimeofday (&ts, NULL) == -1)
    	{
    		error (1, errno, CANT_START_TIMER);
    	}
    	while ((plc->packetsize = readpacket (channel, message, sizeof (* message))) >= 0)
    	{
    		if (UnwantedMessage (message, plc->packetsize, MMV, MMTYPE))
    		{
    			if (gettimeofday (&tc, NULL) == -1)
    			{
    				error (1, errno, CANT_RESET_TIMER);
    			}
    			if (channel->timeout < 0)
    			{
    				continue;
    			}
    			if (channel->timeout > MILLISECONDS (ts, tc))
    			{
    				continue;
    			}
    			plc->packetsize = 0;
    		}
    		break;
    	}
    	return (plc->packetsize);
    }

    #endif

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