rand.c

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#include <stdlib.h>

static unsigned int rand_seed = 1;
extern int rand_r(unsigned int *);

int rand()
{
    return rand_r(&rand_seed);
}

int rand_r(unsigned int *seedp)
{
    *seedp = 16807 * (*seedp) % (RAND_MAX + 1);
    return (int)(*seedp);
}

void srand(
    unsigned int seed)
{
    rand_seed = seed;
}