compiler/clib/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 <sys/cdefs.h>
  15 __FBSDID("$FreeBSD$");
  16
  17 #include "rand48.h"
  18
  19 double erand48(unsigned short xseed[3])
  20 {
  21         _dorand48(xseed);
  22         return ldexp((double) xseed[0], -48) +
  23                ldexp((double) xseed[1], -32) +
  24                ldexp((double) xseed[2], -16);
  25 }