linuxptp/mave.c

73 lines
1.6 KiB
C

/**
* @file mave.c
* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* 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 <stdlib.h>
#include <string.h>
#include "mave.h"
struct mave {
int cnt;
int len;
int index;
tmv_t sum;
tmv_t *val;
};
struct mave *mave_create(int length)
{
struct mave *m;
m = calloc(1, sizeof(*m));
if (!m) {
return NULL;
}
m->val = calloc(1, length * sizeof(*m->val));
if (!m->val) {
free(m);
return NULL;
}
m->len = length;
return m;
}
void mave_destroy(struct mave *m)
{
free(m->val);
free(m);
}
tmv_t mave_accumulate(struct mave *m, tmv_t val)
{
m->sum = tmv_sub(m->sum, m->val[m->index]);
m->val[m->index] = val;
m->index = (1 + m->index) % m->len;
m->sum = tmv_add(m->sum, val);
if (m->cnt < m->len) {
m->cnt++;
}
return tmv_div(m->sum, m->cnt);
}
void mave_reset(struct mave *m)
{
m->cnt = 0;
m->index = 0;
m->sum = 0;
memset(m->val, 0, m->len * sizeof(*m->val));
}