gen/FreeBSD/seed48.c

   1 /*
   2  * Copyright (c) 1993 Martin Birgmeier
   3  * All rights reserved.
   4  *
   5  * You may redistribute unmodified or modified versions of this source
   6  * code provided that the above copyright notice and this and the
   7  * following conditions are retained.
   8  *
   9  * This software is provided ``as is'', and comes with no warranties
  10  * of any kind. I shall in no event be liable for anything that happens
  11  * to anyone/anything when using this software.
  12  */
  13
  14 #include <sys/cdefs.h>
  15 __FBSDID("$FreeBSD: src/lib/libc/gen/seed48.c,v 1.2 2002/03/22 21:52:05 obrien Exp $");
  16
  17 #include "rand48.h"
  18
  19 extern unsigned short _rand48_seed[3];
  20 extern unsigned short _rand48_mult[3];
  21 extern unsigned short _rand48_add;
  22
  23 unsigned short *
  24 seed48(unsigned short xseed[3])
  25 {
  26         static unsigned short sseed[3];
  27
  28         sseed[0] = _rand48_seed[0];
  29         sseed[1] = _rand48_seed[1];
  30         sseed[2] = _rand48_seed[2];
  31         _rand48_seed[0] = xseed[0];
  32         _rand48_seed[1] = xseed[1];
  33         _rand48_seed[2] = xseed[2];
  34         _rand48_mult[0] = RAND48_MULT_0;
  35         _rand48_mult[1] = RAND48_MULT_1;
  36         _rand48_mult[2] = RAND48_MULT_2;
  37         _rand48_add = RAND48_ADD;
  38         return sseed;
  39 }