CURRENT_OFFSET
     Returns an integer for the offset of the current character position
     within the current line.  The leftmost character position is offset 0.
  Syntax
     integer := CURRENT_OFFSET
  Example
     my_cur_off := CURRENT_OFFSET;
     Stores in the variable MY_CUR_OFF the integer for the offset position
     of the current character.
  Related topics
     CURRENT_COLUMN   CURRENT_ROW