gen/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 "rand48.h"
  15
  16 extern unsigned short _rand48_seed[3];
  17 extern unsigned short _rand48_mult[3];
  18 extern unsigned short _rand48_add;
  19
  20 unsigned short *
  21 seed48(unsigned short xseed[3])
  22 {
  23         static unsigned short sseed[3];
  24
  25         sseed[0] = _rand48_seed[0];
  26         sseed[1] = _rand48_seed[1];
  27         sseed[2] = _rand48_seed[2];
  28         _rand48_seed[0] = xseed[0];
  29         _rand48_seed[1] = xseed[1];
  30         _rand48_seed[2] = xseed[2];
  31         _rand48_mult[0] = RAND48_MULT_0;
  32         _rand48_mult[1] = RAND48_MULT_1;
  33         _rand48_mult[2] = RAND48_MULT_2;
  34         _rand48_add = RAND48_ADD;
  35         return sseed;
  36 }