lib/libm/src/s_ldexp.c

   1 /* @(#)s_ldexp0.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 <sys/cdefs.h>
  14 #if defined(LIBM_SCCS) && !defined(lint)
  15 __RCSID("$NetBSD: s_ldexp0.c,v 1.9 2002/05/26 22:01:56 wiz Exp $");
  16 #endif
  17
  18 #include "math.h"
  19 #include "math_private.h"
  20 #include <errno.h>
  21
  22 double
  23 ldexp(double value, int exp0)
  24 {
  25         if(!finite(value)||value==0.0) return value;
  26         value = scalbn(value,exp0);
  27         if(!finite(value)||value==0.0) errno = ERANGE;
  28         return value;
  29 }