newlib/libc/stdlib/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 unsigned short *
  17 _seed48_r (struct _reent *r,
  18        unsigned short xseed[3])
  19 {
  20   static unsigned short sseed[3];
  21
  22   _REENT_CHECK_RAND48(r);
  23   sseed[0] = __rand48_seed[0];
  24   sseed[1] = __rand48_seed[1];
  25   sseed[2] = __rand48_seed[2];
  26   __rand48_seed[0] = xseed[0];
  27   __rand48_seed[1] = xseed[1];
  28   __rand48_seed[2] = xseed[2];
  29   __rand48_mult[0] = _RAND48_MULT_0;
  30   __rand48_mult[1] = _RAND48_MULT_1;
  31   __rand48_mult[2] = _RAND48_MULT_2;
  32   __rand48_add = _RAND48_ADD;
  33   return sseed;
  34 }
  35
  36 #ifndef _REENT_ONLY
  37 unsigned short *
  38 seed48 (unsigned short xseed[3])
  39 {
  40   return _seed48_r (_REENT, xseed);
  41 }
  42 #endif /* !_REENT_ONLY */