bool DecimalDecNumber::toDecimalComponents(const DecimalDecNumber &val, int64& significand, int32& exponent)
{
DecimalDecNumber valCopy = val;
valCopy.m_context.digits = 18; // maximum number of digits which can be represented by int64 significand
// Check if decimal is NaN or infinite - we can't represent these as components
if (decNumberIsSpecial( &valCopy.m_value ))
{
exponent = 0;
significand = 0;
return false;
}
// Minimize the size of the number the significand needs to represent
decNumberReduce( &valCopy.m_value, &valCopy.m_value, &valCopy.m_context );
exponent = valCopy.m_value.exponent;
decNumber numExponent;
decNumberFromInt32( &numExponent, -valCopy.m_value.exponent );
decNumberScaleB( &valCopy.m_value, &valCopy.m_value, &numExponent, &valCopy.m_context );
if (::sscanf(valCopy.toString(0).c_str(), "%lld", &significand) != 1)
{
exponent = 0;
significand = 0;
return false;
}
return true;
}
void* decSingleScaleB (decSingle* _0, const decSingle* _1, const decSingle* _2, decContext* ctx) noexcept
{
decNumber _0num;
decNumber _1num;
decNumber _2num;
decSingleToNumber (_1, &_1num);
decSingleToNumber (_2, &_2num);
decNumberScaleB (&_0num, &_1num, &_2num, ctx);
return decSingleFromNumber (_0, &_0num, ctx);
}
DecimalDecNumber DecimalDecNumber::fromDecimalComponents(const int64 significand, const int32 exponent)
{
DecimalDecNumber number(significand);
if ( exponent != 0 )
{
decNumber numExponent;
decNumberFromInt32( &numExponent, exponent );
decNumberScaleB( &number.m_value, &number.m_value, &numExponent, &number.m_context );
}
return number;
}
