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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))
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