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ttyio.scm
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1999-02-24
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#| -*-Scheme-*-
$Id: ttyio.scm,v 1.12 1999/02/24 21:36:08 cph Exp $
Copyright (c) 1991-1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;;;; Console I/O Ports
;;; package: (runtime console-i/o-port)
(declare (usual-integrations))
(define hook/read-char)
(define hook/peek-char)
(define (initialize-package!)
(let ((input-channel (tty-input-channel))
(output-channel (tty-output-channel)))
(set! hook/read-char operation/read-char)
(set! hook/peek-char operation/peek-char)
(set! the-console-port-type
(make-port-type
`((BEEP ,operation/beep)
(CLEAR ,operation/clear)
(DISCRETIONARY-FLUSH-OUTPUT ,operation/flush-output)
(PEEK-CHAR ,(lambda (port) (hook/peek-char port)))
(READ-CHAR ,(lambda (port) (hook/read-char port)))
(READ-FINISH ,operation/read-finish)
(WRITE-SELF ,operation/write-self)
(X-SIZE ,operation/x-size)
(Y-SIZE ,operation/y-size))
generic-i/o-type))
(set! the-console-port
(make-port the-console-port-type
(make-console-port-state
(make-input-buffer input-channel input-buffer-size)
(make-output-buffer output-channel output-buffer-size)
(channel-type=file? input-channel))))
(set-channel-port! input-channel the-console-port)
(set-channel-port! output-channel the-console-port))
(add-event-receiver! event:before-exit save-console-input)
(add-event-receiver! event:after-restore reset-console)
(set-console-i/o-port! the-console-port)
(set-current-input-port! the-console-port)
(set-current-output-port! the-console-port))
(define the-console-port-type)
(define the-console-port)
(define input-buffer-size 512)
(define output-buffer-size 512)
(define (save-console-input)
((ucode-primitive reload-save-string 1)
(input-buffer/buffer-contents (port/input-buffer console-input-port))))
(define (reset-console)
(let ((input-channel (tty-input-channel))
(output-channel (tty-output-channel))
(state (port/state the-console-port)))
(set-channel-port! input-channel the-console-port)
(set-channel-port! output-channel the-console-port)
(set-console-port-state/input-buffer!
state
(let ((buffer
(make-input-buffer
input-channel
(input-buffer/size (console-port-state/input-buffer state)))))
(let ((contents ((ucode-primitive reload-retrieve-string 0))))
(if contents
(input-buffer/set-buffer-contents buffer contents)))
buffer))
(set-console-port-state/output-buffer!
state
(make-output-buffer
output-channel
(output-buffer/size (console-port-state/output-buffer state))))
(set-console-port-state/echo-input?! state
(channel-type=file? input-channel))))
(define (set-console-i/o-port! port)
(if (not (i/o-port? port))
(error:wrong-type-argument port "I/O port" 'SET-CONSOLE-I/O-PORT!))
(set! console-i/o-port port)
(set! console-input-port port)
(set! console-output-port port)
unspecific)
(define console-i/o-port)
(define console-input-port)
(define console-output-port)
(define-structure (console-port-state (type vector)
(conc-name console-port-state/))
;; First two elements of this vector are required by the generic
;; I/O port operations.
input-buffer
output-buffer
echo-input?)
(define-integrable (port/input-buffer port)
(console-port-state/input-buffer (port/state port)))
(define-integrable (port/output-buffer port)
(console-port-state/output-buffer (port/state port)))
(define (operation/peek-char port)
(let ((char (input-buffer/peek-char (port/input-buffer port))))
(if (eof-object? char)
(signal-end-of-input port))
char))
(define (operation/read-char port)
(let ((char (input-buffer/read-char (port/input-buffer port))))
(if (eof-object? char)
(signal-end-of-input port))
(if (and char (console-port-state/echo-input? (port/state port)))
(output-port/write-char port char))
char))
(define (signal-end-of-input port)
(fresh-line port)
(write-string "End of input stream reached" port)
(%exit))
(define (operation/read-finish port)
(let ((buffer (port/input-buffer port)))
(let loop ()
(if (input-buffer/char-ready? buffer 0)
(let ((char (input-buffer/peek-char buffer)))
(if (char-whitespace? char)
(begin
(operation/read-char port)
(loop)))))))
(output-port/discretionary-flush port))
(define (operation/clear port)
(output-port/write-string port ((ucode-primitive tty-command-clear 0))))
(define (operation/beep port)
(output-port/write-string port ((ucode-primitive tty-command-beep 0))))
(define (operation/x-size port)
port
((ucode-primitive tty-x-size 0)))
(define (operation/y-size port)
port
((ucode-primitive tty-y-size 0)))
(define (operation/write-self port output-port)
port
(write-string " for console" output-port))