11.3.110 line_count/2

Synopsis

line_count(+Stream, -Count)

Obtains the total number of lines either input from or output to the open text stream Stream and unifies it with Count.

Arguments

Stream

stream_object, must be ground

A valid open text stream.

Count

integer

The resulting line count of the stream.

Description

A freshly opened stream has a line count of 0, i.e. this predicate counts the number of newlines seen. When a line is input from or output to a non-tty Prolog stream, the line count of the Prolog stream is increased by one. Line count for a tty stream reflects the total line input from or output to the tty since the tty is opened to any stream.

The count is reset by set_stream_position/2.

Exceptions

Stream errors (see ref-iou-sfh-est).

See Also

byte_count/2, character_count/2, line_position/2, stream_position/2, set_stream_position/2, ref-iou-sfh.