// 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_int.cpp

 // Writes the integer part aTrg to aSrc (aSrc is either TReal,TInt16 orTInt32)

 // 

 //

 #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

 #ifndef __REALS_MACHINE_CODED__

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

 /**

 Calculates the integer part of a number.

 The integer part is that before a decimal point.

 Truncation is toward zero, so that

 int(2.4)=2, int(2)=2, int(-1)=-1, int(-1.4)=-1, int(-1.999)=-1.

 @param aTrg A reference containing the result. 

 @param aSrc The number whose integer part is required. 

 @return KErrNone if successful, otherwise another of

         the system-wide error codes. 

 */

 	{

 	TRealX f;

 	TInt ret=f.Set(aSrc);

 	if (ret!=KErrNone)

 		{

 		aTrg=aSrc;

 		return(ret);

 		}

 	TInt intbits=f.iExp-0x7FFE;	// number of integer bits in mantissa

 	if (intbits<=0)

 		{

 		SetZero(aTrg,f.iSign&1); // no integer part

 		return(KErrNone);

 		}

 	if (intbits>=KMantissaBits)

 		{

 		aTrg=aSrc; // fractional part is outside range of significance

 		return(KErrNone);

 		}

 	TUint64 mask = ~(UI64LIT(0));

 	mask <<= (64 - intbits);

 	f.iMantHi &= static_cast<TUint32>(mask >> 32);

 	f.iMantLo &= static_cast<TUint32>(mask);

 	f.GetTReal(aTrg);

 	return(KErrNone);

 	}

 EXPORT_C TInt Math::Int(TInt16 &aTrg,const TReal &aSrc)

 /**

 Calculates the integer part of a number.

 The integer part is that before a decimal point.

 Truncation is toward zero, so that

 int(2.4)=2, int(2)=2, int(-1)=-1, int(-1.4)=-1, int(-1.999)=-1.

 This function is suitable when the result is known to be small enough

 for a 16-bit signed integer.

 @param aTrg A reference containing the result. 

 @param aSrc The number whose integer part is required.

 @return KErrNone if successful, otherwise another of

         the system-wide error codes.

 */

 //

 // If the integer part of aSrc is in the range -32768 to +32767

 // inclusive, write the integer part to the TInt16 at aTrg

 // Negative numbers are rounded towards zero.

 // If an overflow or underflow occurs, aTrg is set to the max/min value

 //

 	{

 	TRealX f;

 	TInt ret=f.Set(aSrc);

 	if (ret==KErrArgument)

 		{

 		aTrg=0;

 		return(ret);

 		}

 	TInt intbits=f.iExp-0x7FFE;	// number of integer bits in mantissa

 	if (intbits<=0)

 		{

 		aTrg=0;

 		return(KErrNone);

 		}

 	if (intbits>16)

 		{

 		aTrg=(TInt16)((f.iSign&1) ? KMinTInt16 : KMaxTInt16);

 		return((f.iSign&1) ? KErrUnderflow : KErrOverflow);

 		}

 	TUint val = f.iMantHi >> (32 - intbits);

 	if ((f.iSign&1)==0 && val>(TUint)KMaxTInt16)

 		{

 		aTrg=TInt16(KMaxTInt16);

 		return(KErrOverflow);

 		}

 	if ((f.iSign&1) && val>(TUint)(KMaxTInt16+1))

 		{

 		aTrg=TInt16(KMinTInt16);

 		return(KErrUnderflow);

 		}

 	aTrg = (f.iSign&1) ? (TInt16)(-(TInt)val) : (TInt16)val;

 	return(KErrNone);

 	} 

 EXPORT_C TInt Math::Int(TInt32 &aTrg,const TReal &aSrc)

 /**

 Calculates the integer part of a number.

 The integer part is that before a decimal point.

 Truncation is toward zero, so that

 int(2.4)=2, int(2)=2, int(-1)=-1, int(-1.4)=-1, int(-1.999)=-1.

 This function is suitable when the result is known to be small enough

 for a 32-bit signed integer.

 @param aTrg A reference containing the result. 

 @param aSrc The number whose integer part is required.

 @return KErrNone if successful, otherwise another of

         the system-wide error codes.

 */

 //													 

 // If the integer part of the float is in the range -2147483648 to +2147483647

 // inclusive, write the integer part to the TInt32 at aTrg

 // Negative numbers are rounded towards zero.

 // If an overflow or underflow occurs, aTrg is set to the max/min value

 //

 	{

 	TRealX f;

 	TInt ret=f.Set(aSrc);

 	if (ret==KErrArgument)

 		{

 		aTrg=0;

 		return(ret);

 		}

 	TInt intbits=f.iExp-0x7FFE;	// number of integer bits in mantissa

 	if (intbits<=0)

 		{

 		aTrg=0;

 		return(KErrNone);

 		}

 	if (intbits>32)

 		{

 		aTrg=((f.iSign&1) ? KMinTInt32 : KMaxTInt32);

 		return((f.iSign&1) ? KErrUnderflow : KErrOverflow);

 		}

 	TUint val = f.iMantHi >> (32 - intbits);

 	if ((f.iSign&1)==0 && val>(TUint)KMaxTInt32)

 		{

 		aTrg=KMaxTInt32;

 		return(KErrOverflow);

 		}

 	if ((f.iSign&1) && val>((TUint)KMaxTInt32+1))

 		{

 		aTrg=KMinTInt32;

 		return(KErrUnderflow);

 		}

 	aTrg=(f.iSign&1) ? -(TInt32)val : val;

 	return(KErrNone);

 	}

 #endif //__REALS_MACHINE_CODED__

 #else // __USE_VFP_MATH

 // definitions come from RVCT math library

 extern "C" TReal modf(TReal,TReal*);

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

 	{

 	if (Math::IsNaN(aSrc))

 		{

 		SetNaN(aTrg);

 		return KErrArgument;

 		}

 	if (Math::IsInfinite(aSrc))

 		{

 		aTrg=aSrc;

 		return KErrOverflow;

 		}

 	modf(aSrc,&aTrg);

 	return KErrNone;

 	}

 EXPORT_C TInt Math::Int(TInt32& aTrg, const TReal& aSrc)

 	{

 	TReal aIntPart;

 	TInt r = Math::Int(aIntPart,aSrc);

 	if (r==KErrArgument)

 		{

 		aTrg = 0;

 		return r;

 		}

 	if (aIntPart>KMaxTInt32)

 		{

 		aTrg = KMaxTInt32;

 		return KErrOverflow;

 		}

 	if (aIntPart<KMinTInt32)

 		{

 		aTrg = KMinTInt32;

 		return KErrUnderflow;

 		}

 	aTrg = aIntPart;

 	return KErrNone;

 	}

 EXPORT_C TInt Math::Int(TInt16& aTrg, const TReal& aSrc)

 	{

 	TReal aIntPart;

 	TInt r = Math::Int(aIntPart,aSrc);

 	if (r==KErrArgument)

 		{

 		aTrg = 0;

 		return r;

 		}

 	if (aIntPart>KMaxTInt16)

 		{

 		aTrg = KMaxTInt16;

 		return KErrOverflow;

 		}

 	if (aIntPart<KMinTInt16)

 		{

 		aTrg = KMinTInt16;

 		return KErrUnderflow;

 		}

 	aTrg = aIntPart;

 	return KErrNone;

 	}

 #endif