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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* @(#)s_ldexp.c 5.1 93/09/24 */
  3. /*
  4.  * ====================================================
  5.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  6.  *
  7.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  8.  * Permission to use, copy, modify, and distribute this
  9.  * software is freely granted, provided that this notice
  10.  * is preserved.
  11.  * ====================================================
  12.  */
  13.  
  14. #if defined(LIBM_SCCS) && !defined(lint)
  15. static char rcsid[] = "$Id: s_ldexp.c,v 1.4 1994/08/10 20:32:37 jtc Exp $";
  16. #endif
  17.  
  18. #include "math.h"
  19. #include "math_private.h"
  20. #include <errno.h>
  21.  
  22. #ifdef __STDC__
  23.         double ldexp(double value, int exp)
  24. #else
  25.         double ldexp(value, exp)
  26.         double value; int exp;
  27. #endif
  28. {
  29.         if(!finite(value)||value==0.0) return value;
  30.         value = scalbn(value,exp);
  31.         if(!finite(value)||value==0.0) errno = ERANGE;
  32.         return value;
  33. }
  34.