compiler/posixc/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 /*****************************************************************************
  21
  22     NAME */
  23
  24         unsigned short *seed48(
  25
  26 /*  SYNOPSIS */
  27         unsigned short xseed[3])
  28
  29 /*  FUNCTION
  30
  31     INPUTS
  32
  33     RESULT
  34
  35     NOTES
  36
  37     EXAMPLE
  38
  39     BUGS
  40
  41     SEE ALSO
  42
  43     INTERNALS
  44
  45 ******************************************************************************/
  46 {
  47         static unsigned short sseed[3];
  48
  49         sseed[0] = _rand48_seed[0];
  50         sseed[1] = _rand48_seed[1];
  51         sseed[2] = _rand48_seed[2];
  52         _rand48_seed[0] = xseed[0];
  53         _rand48_seed[1] = xseed[1];
  54         _rand48_seed[2] = xseed[2];
  55         _rand48_mult[0] = RAND48_MULT_0;
  56         _rand48_mult[1] = RAND48_MULT_1;
  57         _rand48_mult[2] = RAND48_MULT_2;
  58         _rand48_add = RAND48_ADD;
  59         return sseed;
  60 }
  61