Help translating from VB

[brenaaro]

Can someone help me translate this from VB to C++?

' Visual Basic version
Public Function LineTrim(Expression As String) As String
'Remove trailing CRs and LFs
    Dim sReturn As String
    Dim sCheck As String
    
    sReturn = Expression
    
    sCheck = Right(sReturn, 1)
 
    Do While (sCheck = Chr(10)) Or (sCheck = Chr(13))
        sReturn = Left(sReturn, Len(sReturn) - 1)
        sCheck = Right(sReturn, 1)
    Loop
    
    LineTrim = sReturn
    
End Function

and now the C++ version, which will be in a DLL for VB

LPCSTR LineTrim(LPCSTR *Expression)
{
     // I dont want to alter the original string,
     // so I need to declare this return value correct?
     LPCSTR ReturnVal;

     // How can I move the pointer to the end of the LPCSTR
     // without looping through it until '/0'

     // How can I check for the ascii value of the current char,
     // and shorten the string if it's CR or LF?

     LineTrim = ReturnVal;
}