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+; "lineio.scm", line oriented input/output functions for Scheme.
+; Copyright (c) 1992, 1993 Aubrey Jaffer
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+(define (read-line . arg)
+  (let* ((char (apply read-char arg)))
+    (if (eof-object? char)
+	char
+	(do ((char char (apply read-char arg))
+	     (clist '() (cons char clist)))
+	    ((or (eof-object? char) (char=? #\newline char))
+	     (list->string (reverse clist)))))))
+
+(define (read-line! str . arg)
+  (let* ((char (apply read-char arg))
+	 (len (+ -1 (string-length str))))
+    (if (eof-object? char)
+	char
+	(do ((char char (apply read-char arg))
+	     (i 0 (+ 1 i)))
+	    ((or (eof-object? char)
+		 (char=? #\newline char)
+		 (>= i len))
+	     (cond ((or (eof-object? char) (char=? #\newline char))
+		    i)
+		   (else
+		    (string-set! str i char)
+		    (set! char (apply peek-char arg))
+		    (if (or (eof-object? char) (char=? #\newline char))
+			(+ 1 i) #f))))
+	  (string-set! str i char)))))
+
+(define (write-line str . arg)
+  (apply display str arg)
+  (apply newline arg))