s_ldexp.c (655B)
1 /* @(#)s_ldexp.c 5.1 93/09/24 */ 2 /* 3 * ==================================================== 4 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 5 * 6 * Developed at SunPro, a Sun Microsystems, Inc. business. 7 * Permission to use, copy, modify, and distribute this 8 * software is freely granted, provided that this notice 9 * is preserved. 10 * ==================================================== 11 */ 12 13 #include "math.h" 14 #include "math_private.h" 15 #include <errno.h> 16 17 double 18 ldexp(double value, int exp) 19 { 20 if(!finite(value)||value==0.0) return value; 21 value = scalbn(value,exp); 22 if(!finite(value)||value==0.0) errno = ERANGE; 23 return value; 24 }