math/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 #if defined(LIBM_SCCS) && !defined(lint)
  14 static char rcsid[] = "$NetBSD: s_ldexp.c,v 1.6 1995/05/10 20:47:40 jtc 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) __set_errno (ERANGE);
  31         return value;
  32 }
  33 weak_alias (__ldexp, ldexp)
  34 #ifdef NO_LONG_DOUBLE
  35 strong_alias (__ldexp, __ldexpl)
  36 weak_alias (__ldexp, ldexpl)
  37 #endif