Generic Function stream-advance-to-column
stream-advance-to-column (stream column)
Write enough blank space so that the next character will be written at the specified column. Returns true if the operation is successful, or nil if it is not supported for this stream. This is intended for use by cl:pprint and cl:format ~t. The default method uses stream-line-column and repeated calls to stream-write-char with a \#space character; it returns nil if stream-line-column returns nil.