lib/libm/src/s_ldexpf.c

   1 /* s_ldexp0f.c -- float version of s_ldexp0.c.
   2  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #include <sys/cdefs.h>
  17 #if defined(LIBM_SCCS) && !defined(lint)
  18 __RCSID("$NetBSD: s_ldexpf.c,v 1.8 2010/04/23 19:17:07 drochner Exp $");
  19 #endif
  20
  21 #include "namespace.h"
  22 #include "math.h"
  23 #include "math_private.h"
  24 #include <errno.h>
  25
  26 float
  27 ldexpf(float value, int exp0)
  28 {
  29         if(!finitef(value)||value==(float)0.0) return value;
  30         value = scalbnf(value,exp0);
  31         if(!finitef(value)||value==(float)0.0) errno = ERANGE;
  32         return value;
  33 }