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 20 erand48(unsigned short xseed[3]) 21 { 22 _dorand48(xseed); 23 return ldexp((double) xseed[0], -48) + 24 ldexp((double) xseed[1], -32) + 25 ldexp((double) xseed[2], -16); 26 } 27