compiler/mlib/s_ldexp.c

   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 #ifndef lint
  14 static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_ldexp.c,v 1.5 1999/08/28 00:06:51 peter Exp $";
  15 #endif
  16
  17 #include "math.h"
  18 #include "math_private.h"
  19 #include <errno.h>
  20
  21 #ifdef __STDC__
  22         double ldexp(double value, int exp)
  23 #else
  24         double ldexp(value, exp)
  25         double value; int exp;
  26 #endif
  27 {
  28         if(!finite(value)||value==0.0) return value;
  29         value = scalbn(value,exp);
  30         if(!finite(value)||value==0.0) errno = ERANGE;
  31         return value;
  32 }