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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))