Import Upstream version 2d2upstream/2d2

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+
+@defun read-line
+
+
+@defunx read-line port
+Returns a string of the characters up to, but not including a
+newline or end of file, updating @var{port} to point to the
+character following the newline.  If no characters are available, an
+end of file object is returned.  The @var{port} argument may be
+omitted, in which case it defaults to the value returned by
+@code{current-input-port}.
+@end defun
+
+@defun read-line! string
+
+
+@defunx read-line! string port
+Fills @var{string} with characters up to, but not including a newline or end
+of file, updating the @var{port} to point to the last character read
+or following the newline if it was read.  If no characters are
+available, an end of file object is returned.  If a newline or end
+of file was found, the number of characters read is returned.
+Otherwise, @code{#f} is returned.  The @var{port} argument may be
+omitted, in which case it defaults to the value returned by
+@code{current-input-port}.
+@end defun
+
+@defun write-line string
+
+
+@defunx write-line string port
+Writes @var{string} followed by a newline to the given @var{port} and returns
+an unspecified value.  The @var{Port} argument may be omitted, in
+which case it defaults to the value returned by
+@code{current-input-port}.@refill
+@end defun
+
+@defun display-file path
+
+
+@defunx display-file path port
+Displays the contents of the file named by @var{path} to @var{port}.  The
+@var{port} argument may be ommited, in which case it defaults to the
+value returned by @code{current-output-port}.
+@end defun