4.1cBSD/usr/src/lib/libc/gen/rand.c

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/* @(#)rand.c	4.1 (Berkeley) 12/21/80 */
static	long	randx = 1;

srand(x)
unsigned x;
{
	randx = x;
}

rand()
{
	return((randx = randx * 1103515245 + 12345) & 0x7fffffff);
}