// Copyright (c) 1997-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of "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:

 // LMATH.CPP - Wrappers for Epoc32 Math functions

 // 

 //

 #include <e32math.h>

 #include "FDLIBM.H"

 #include <errno.h>

 extern "C" {

 /**

  * Map the Symbian error value to the standard error number and put it into errno.

  * @internalComponent 

  * @param aSymbianReturnValue the standard return value returned from the Symbian function.

  * @param aNan the result of Math::Nan

  */ 

 void MapSymbianErrorCodeToErrno(int aSymbianReturnValue, int aNan)

 {

 	switch(aSymbianReturnValue)

 	{

 	case (KErrNone):

 		{

 		//errno does not get set to 0 according to the standard.  

 		//The user must initialize it before calling the function.

 		break;

 		}

 	case (KErrArgument):

 		{

 		if (aNan)

 			errno = EDOM;

 		else

 			errno = EINVAL;

 		break;

 		}

 	case (KErrOverflow):

 	case (KErrUnderflow):

 	case (KErrTotalLossOfPrecision):

 		{

 		errno = ERANGE;

 		break;

 		}

 	}

 }

 /**

 Calculate arctangent.

 Performs the trigonometric arctangent operation on x and returns an angle in the range from -PI/2 to PI/2 expressed in radians.  

 @return Arctangent of arg1.

 @param arg1 Value whose arctangent has to be calculated.

 */

 EXPORT_C double atan (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::ATan(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate cosine.

 Performs the trigonometric cosine operation on x returning a value between -1 and 1.  

 @return Cosine of arg1.

 @param arg1 Angle expressed in radians (180 degrees = PI radians).

 */

 EXPORT_C double cos (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Cos(result, arg1);

 	MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate sine.

 Performs the trigonometric sine operation on x returning a value between -1 and 1.  

 @return Sine of arg1.

 @param arg1 Angle expressed in radians (180 degrees = PI radians).

 */

 EXPORT_C double sin (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Sin(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate tangent.

 Performs the trigonometric tangent operation on arg1.  

 @return Tangent of arg1.

 @param arg1 Angle expressed in radians (180 degrees = PI radians).

 */

 EXPORT_C double tan (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Tan(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate arccosine.

 Performs the trigonometric arc cosine operation on x and returns an angle in the range from 0 to PI expressed in radians.  

 @return Arc cosine of arg1.

 @param arg1 Value between -1 and 1 whose arc cosine has to be calculated.

 */

 EXPORT_C double acos (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::ACos(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate arcsine.

 Performs the trigonometric arc sine operation on x and returns an angle in the range from -PI/2 to PI/2 expressed in radians.  

 @return Arc sine of arg1

 @param arg1 Value between -1 and 1 whose arc sine has to be calculated.

 */

 EXPORT_C double asin (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::ASin(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate exponential.

 Returns the exponential value of parameter arg1.  

 @return Exponential of arg1

 @param arg1 Floating point value.

 */

 EXPORT_C double exp (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Exp(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate natural logarithm.  

 Returns the natural logarithm of parameter arg1

 @return Logarithm of arg1.

 @param arg1 Floating point value.

 */

 EXPORT_C double log (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Ln(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate logarithm base 10.  

 Returns the logarithm base 10 of parameter arg1 

 @return Logarithm base 10 of arg1

 @param arg1 Floating point value.

 */

 EXPORT_C double log10 (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Log(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate square root.  

 Returns the square root of parameter arg1.

 @return Square root of arg1

 @param arg1 Non-negative floating point value.

 */

 EXPORT_C double sqrt (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Sqrt(result, arg1);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate arctangent, 2 parameters.

 Performs the trigonometric arctangent operation on y/x and returns an angle in the range from -PI to PI expressed in radians, using the signs of the parameters to determine the quadrant.

 The result is valid even if arg2 is 0 (angle is PI/2 or -PI/2).

 In fact this function returns the angle of bidimensional vector (arg2,arg1).

 @return Arctangent of arg1/arg2.

 @param arg1 and arg2.Values from whose division has to be calculated the arctangent.i.e.: Coordinates for the vector whose angle is to be calculated.

 */

 EXPORT_C double atan2 (double arg1, double arg2) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::ATan(result, arg1, arg2);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Calculate numeric power.

 Returns arg1 raised to the power of arg2.   

 @return   arg1 raised to the power of arg2.

 @param arg1 - Base value. 

 @param arg2 - Exponent value.

 */

 EXPORT_C double pow (double arg1, double arg2) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Pow(result, arg1, arg2);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Return remainder of floating point division.

 Performs division arg1/arg2 and returns the remainder of the operation.  

 @return Remainder of arg1/arg2.

 @param arg1 and arg2 - Floating point values

 */

 EXPORT_C double fmod (double arg1, double arg2) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Mod(result, arg1, arg2);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 Round to integral value in floating-point format

 @return the integral value (represented as a double precision number) nearest to arg1 according to the prevailing rounding mode.

 @param arg1 floating point value to round.

 */

 EXPORT_C double rint (double arg1) __SOFTFP

     {

     double result;

     int    returnValue;

     returnValue = Math::Round(result, arg1, 0);

     MapSymbianErrorCodeToErrno(returnValue, Math::IsNaN(result));

     return result;

     }

 /**

 tests whether d is NaN

 @return non-zero if d is NaN. Otherwise, 0 is returned.

 @param d floating point value.

 */

 EXPORT_C int isnan (double d) __SOFTFP

 	{

 	return Math::IsNaN(d);

 	}

 /**

 test for infinity or not-a-number

 @return 1 if the number d is Infinity, otherwise 0.

 @param d floating point value to test.

 */

 EXPORT_C int isinf (double d) __SOFTFP

 	{

 	return Math::IsInfinite(d);

 	}

 /**

 Test for finity.

 @return a nonzero value if the x parameter is a finite number;

 that is, if d is not +-, INF, NaNQ, or NaNS.

 @param d floating point value to test.

 */

 EXPORT_C int finite (double d) __SOFTFP

 	{

 	return Math::IsFinite(d);

 	}

 }	// end of extern "C"