// Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of the License "Eclipse Public License v1.0"

 // which accompanies this distribution, and is available

 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 // e32\euser\maths\um_log.cpp

 // Floating point base 10 logarithm

 // 

 //

 #include "um_std.h"

 #if defined(__USE_VFP_MATH) && !defined(__CPU_HAS_VFP)

 #error	__USE_VFP_MATH was defined but not __CPU_HAS_VFP - impossible combination, check variant.mmh 

 #endif

 #ifndef __USE_VFP_MATH

 EXPORT_C TInt Math::Log(TReal &aTrg,const TReal &aSrc)

 /**

 Calculates the logarithm to base 10 of a number.

 @param aTrg  A reference containing the result. 

 @param aSrc  The number whose logarithm is required. 

 @return KErrNone if successful, otherwise another of

         the system-wide error codes. 

 */

 //

 // Base 10 log routine. See Software manual by W.J.Cody & W.Waite

 //

 	{

 	TInt ret=Math::Ln(aTrg,aSrc);

 	if (ret!=KErrNone)

 		return(ret);    	

 	aTrg*=KRln10;

 	return(ret);

 	}

 #else // __USE_VFP_MATH

 // definitions come from RVCT math library

 extern "C" TReal log10(TReal);

 EXPORT_C TInt Math::Log(TReal& aTrg, const TReal& aSrc)

 	{

 	aTrg = log10(aSrc);

 	if (Math::IsFinite(aTrg))

 		return KErrNone;

 	if (Math::IsInfinite(aTrg))

 		return KErrOverflow;

 	SetNaN(aTrg);

 	return KErrArgument;

 	}

 #endif