csu3_am335x/EVSE/GPL/open-plc-utils-0.3/slac/slac_connect.c

/*====================================================================*
 *
 *   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
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 *   OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *--------------------------------------------------------------------*/

/*====================================================================*
 *
 *   void slac_connect (struct session * session);
 *
 *   slac.h
 *
 *   compute the arithmetic mean of session attenuation values and
 *   compare to the session limit; average attenuation greater than
 *   the session limit is considered a bad connection;
 *
 *--------------------------------------------------------------------*/

#ifndef SLAC_AVERAGE_SOURCE
#define SLAC_AVERAGE_SOURCE

#include "../tools/error.h"
#include "../tools/flags.h"
#include "../tools/memory.h"
#include "../slac/slac.h"

signed slac_connect (struct session * session)

{
	unsigned group = 0;
	unsigned total = 0;
	if (session->NumGroups > SIZEOF (session->AAG))
	{
		return (slac_debug (session, session->exit, __func__, "Too much data to analyse!"));
	}
	if (session->NumGroups > 0)
	{
		char string [512];
		while (group < session->NumGroups)
		{
			total += session->AAG [group];
			group++;
		}
		total /= group;
		if (total > session->limit)
		{
			char string [512];
			slac_debug (session, 0, __func__, "Average attenuation (%u) more than limit (%u) frow %d groups", total, session->limit, group);
			slac_debug (session, 0, __func__, "%s", HEXSTRING (string, session->AAG));
			return (- 1);
		}
		if (total > 0)
		{
			slac_debug (session, 0, __func__, "Average attenuation (%u) less than limit (%u) from %d groups", total, session->limit, group);
			slac_debug (session, 0, __func__, "%s", HEXSTRING (string, session->AAG));
			return (0);
		}
	}
	return (slac_debug (session, session->exit, __func__, "Nothing to analyse"));
}

#endif