LENGTH
  Returns an integer for the number of characters in a buffer, range or
  string.  Note that the length of a buffer or range does not include line
  ends.
  Syntax
     integer := LENGTH ({buffer | range | string})
  Parameters
     buffer     The buffer whose length you want to determine.
     range      A range whose length you want to determine.
     string     A string whose length you want to determine.
  Example
     str_len := LENGTH ("Sir John Falstaff");
  Stores in the variable STR_LEN the number of characters in the string "Sir
  John Falstaff" -- in this example, the integer value is 17.