#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/gen/_rand48.c,v 1.2 2002/03/22 21:52:05 obrien Exp $");
#include "rand48.h"
unsigned short _rand48_seed[3] = {
RAND48_SEED_0,
RAND48_SEED_1,
RAND48_SEED_2
};
unsigned short _rand48_mult[3] = {
RAND48_MULT_0,
RAND48_MULT_1,
RAND48_MULT_2
};
unsigned short _rand48_add = RAND48_ADD;
void
_dorand48(unsigned short xseed[3])
{
unsigned long accu;
unsigned short temp[2];
accu = (unsigned long) _rand48_mult[0] * (unsigned long) xseed[0] +
(unsigned long) _rand48_add;
temp[0] = (unsigned short) accu;
accu >>= sizeof(unsigned short) * 8;
accu += (unsigned long) _rand48_mult[0] * (unsigned long) xseed[1] +
(unsigned long) _rand48_mult[1] * (unsigned long) xseed[0];
temp[1] = (unsigned short) accu;
accu >>= sizeof(unsigned short) * 8;
accu += _rand48_mult[0] * xseed[2] + _rand48_mult[1] * xseed[1] + _rand48_mult[2] * xseed[0];
xseed[0] = temp[0];
xseed[1] = temp[1];
xseed[2] = (unsigned short) accu;
}