open/4 option: end_of_line(LineBorder)
QP_stream: int line_border
The line_border field can be any integer
greater than or equal to QP_NOLB (-1). If the value
is QP_NOLB, there is no line border code for the stream.
For an input stream, the line border code is the value to be returned
in getting a character when a stream is positioned at the end of a record.
(Notice that if the
stream is a delimited record format stream, the delimited character
has already been removed.)
If there is no line border code, the first character in the next record
is returned at the end of a record.
Writing the line border code (i.e. with put/[1,2]) to an output stream
signals the end of the
current record. Instead of writing out the line border code,
the record is appropriately wrapped up based on the format of
the stream, and the wrapped record is handed to the bottom layer
write function of the stream. This is just like a new line operation
on the stream (e.g. nl/[0,1] or QP_newln()).