newlib/libc/stdlib/erand48.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 double
  17 _erand48_r (struct _reent *r,
  18        unsigned short xseed[3])
  19 {
  20   __dorand48(r, xseed);
  21   return ldexp((double) xseed[0], -48) +
  22     ldexp((double) xseed[1], -32) +
  23     ldexp((double) xseed[2], -16);
  24 }
  25
  26 #ifndef _REENT_ONLY
  27 double
  28 erand48 (unsigned short xseed[3])
  29 {
  30   return _erand48_r (_REENT, xseed);
  31 }
  32 #endif /* !_REENT_ONLY */