cc implementation for home, end and del in read()

            elseif param == keys.home then
                -- Home
                nPos = 0
                redraw()

            elseif param == keys.delete then
                if nPos < string.len(sLine) then
                    sLine = string.sub( sLine, 1, nPos ) .. string.sub( sLine, nPos + 2 )
                    redraw()
                end
            elseif param == keys['end'] then
                -- End
                nPos = string.len(sLine)
                redraw()