Random.cc

#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include "Random.h"

Random::Random(void)
{
    reset();
}

Random::Random(unsigned int seed)
{
    srandom(seed);
}

void
Random::reset(void)
{
    FILE *fp;
    unsigned int seed;
    struct timeval tv;

    fp = fopen("/dev/urandom", "r");
    if (!fp) fp = fopen("/dev/random", "r");

    if (fp) {
        int res = fread(&seed, sizeof(unsigned int), 1, fp);
        if (res != sizeof(unsigned int)) {
            fclose(fp);
            fp = NULL;
        }
    }

    if (!fp) {
        gettimeofday(&tv, NULL);
        seed = (tv.tv_sec ^ tv.tv_usec);
    } else {
        fclose(fp);
    }

    srandom(seed);
}

int
Random::getData(void)
{
    return random();
}

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