The Convert Octal Text to Unsigned Integer routine converts an
    ASCII text string representation of an unsigned octal value to
    an unsigned integer. The integer value can be of arbitrary length
    but is typically a byte, word, longword, or quadword. The default
    size of the result is a longword.

    Format

      OTS$CVT_TO_L  fixed-or-dynamic-input-string

                    ,varying-output-value [,output-value-size]

                    [,flags-value]