linux-vybrid_public/net/batman-adv/ring_buffer.c

/* Copyright (C) 2007-2013 B.A.T.M.A.N. contributors:
 *
 * Marek Lindner
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA
 */

#include "main.h"
#include "ring_buffer.h"

void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
			    uint8_t value)
{
	lq_recv[*lq_index] = value;
	*lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
}

uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
{
	const uint8_t *ptr;
	uint16_t count = 0, i = 0, sum = 0;

	ptr = lq_recv;

	while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
		if (*ptr != 0) {
			count++;
			sum += *ptr;
		}

		i++;
		ptr++;
	}

	if (count == 0)
		return 0;

	return (uint8_t)(sum / count);
}