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    Length: 2520 (0x9d8)
    Types: TextFile
    Names: »oldio.scm.4«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─ ⟦this⟧ »EUUGD11/gnu-31mar87/scheme/scm/oldio.scm.4« 

TextFile

;;; -*-Scheme-*-
;;;
;;;	Copyright (c) 1984 Massachusetts Institute of Technology
;;;
;;;	This material was developed by the Scheme project at the
;;;	Massachusetts Institute of Technology, Department of
;;;	Electrical Engineering and Computer Science.  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. Users of this software agree to make their best efforts (a)
;;;	to return to the MIT Scheme project any improvements or
;;;	extensions that they make, so that these may be included in
;;;	future releases; and (b) to inform MIT of noteworthy uses of
;;;	this software.
;;;
;;;	3.  All materials developed as a consequence of the use of
;;;	this software shall duly acknowledge such use, in accordance
;;;	with the usual standards of acknowledging credit in academic
;;;	research.
;;;
;;;	4. MIT has made no warrantee or representation that the
;;;	operation of this software will be error-free, and MIT is
;;;	under no obligation to provide any services, by way of
;;;	maintenance, update, or otherwise.
;;;
;;;	5.  In conjunction with products arising from the use of this
;;;	material, there shall be no use of the name of the
;;;	Massachusetts Institute of Technology nor of any adaptation
;;;	thereof in any advertising, promotional, or sales literature
;;;	without prior written consent from MIT in each case.
;;;

;;;; Old I/O Procedure Names

(declare (usual-integrations))
\f


(define reader-channel? input-stream?)
(define open-reader-channel open-input-stream)
(define close-reader-channel close-input-stream)

(define (with-reader-channel stream eof-option receiver)
  (with-eof-option eof-option
    (lambda ()
      (with-input-from-stream stream
	(lambda ()
	  (receiver *tyi *tyipeek *read))))))

(define printer-channel? output-stream?)
(define open-printer-channel open-output-stream)
(define close-printer-channel close-output-stream)

(define (with-printer-channel stream printer)
  (with-output-to-stream stream
    (lambda ()
      (printer *unparse-character
	       *unparse-string
	       *unparse-object))))

(define (close-channel channel)
  (if (output-stream? channel)
      (close-output-stream channel)
      (if (input-stream? channel)
          (close-input-stream channel)
          (error "Not a channel" channel))))

(define printing-to-channel with-printer-channel)