12.9.6 Foreign stream line endings

Text streams have a field newline that controls the handling of the newline convention. Note that inside Prolog all lines end with a single newline (\u000a, \n) code point. The values are described below. The default depends on the OS and can be manipulated using the newline(Mode) property of set_stream/2.

SIO_NL_DETECT

This mode may be enabled on an input stream. It causes the stream to read up to the first newline to set the newline mode accordingly.

SIO_NL_POSIX

Do not do any translation on input or output.

SIO_NL_DOS

Emit a newline (\n) as \r\n. Discard \r from the input.^{244The current implementation does not check that the character is followed by \n.}