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#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include "ma.h"
struct smaint
{
int *samples;
int size;
int nsamples;
int in;
int sma;
};
SMAINT
smaint_new(int size, int initval)
{
SMAINT sma;
sma = (SMAINT) malloc(sizeof(*sma));
if (!sma) return NULL;
sma->samples = (int *) malloc(sizeof(int) * size);
if (!sma->samples)
{
free(sma);
return NULL;
}
memset(sma->samples, 0, sizeof(int) * size);
sma->size = size;
sma->nsamples = 0;
sma->in = 0;
sma->sma = initval;
return sma;
}
int
smaint_add(SMAINT sma, int value)
{
sma->sma += value;
sma->sma -= sma->samples[sma->in];
sma->samples[sma->in++] = value;
if (++sma->nsamples >= sma->size)
sma->nsamples = sma->size;
if (sma->in >= sma->size)
sma->in = 0;
return sma->sma / sma->nsamples;
}
int
smaint(SMAINT sma)
{
return sma->sma / sma->nsamples;
}
void
smaint_free(SMAINT sma)
{
if (!sma)
return;
if (sma->samples)
free(sma->samples);
free(sma);
}
#ifdef UNIT_TEST
int
main(int argc, char *argv[])
{
SMAINT sma;
int i;
sma = smaint_new(30, 0);
for (i = 1; i <= 60; ++i)
printf("%d: %d\n", i, smaint_add(sma, i));
for (i = 1; i <= 30; ++i)
printf("%d: %d\n", i+60, smaint_add(sma, 60));
for (i = 1; i <= 30; ++i)
printf("%d: %d\n", i+90, smaint_add(sma, 0));
smaint_free(sma);
}
#endif
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