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termios.scm
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;;;
;;; termios - termios interface
;;;
;;; Copyright (c) 2000-2014 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
(define-module gauche.termios
(use gauche.uvector)
(export-all)
)
(select-module gauche.termios)
(dynamic-load "gauche--termios")
(cond-expand
[gauche.os.windows (use os.windows)]
[else])
;;
;; High-level utilities
;;
;; NB: on windows, this only works with iport==#f.
(define (without-echoing iport proc)
(cond [(not iport) ;; open tty
(call-with-input-file
(cond-expand [gauche.os.windows "CON"] [else "/dev/tty"])
(cut without-echoing <> proc))]
[(sys-isatty iport)
(let ()
(cond-expand
[gauche.os.windows
(define ihandle (sys-get-std-handle STD_INPUT_HANDLE))
(define orig-mode (sys-get-console-mode ihandle))
(define (echo-off)
(sys-set-console-mode ihandle
(logand orig-mode
(lognot ENABLE_ECHO_INPUT))))
(define (echo-on)
(sys-set-console-mode ihandle orig-mode))]
[else
(begin
(define attr (sys-tcgetattr iport))
(define lflag-save (ref attr'lflag))
(define (echo-off)
(set! (ref attr'lflag)
(logand (ref attr'lflag)
(lognot (logior ECHO ICANON ISIG))))
(sys-tcsetattr iport TCSANOW attr))
(define (echo-on)
(set! (ref attr'lflag) lflag-save)
(sys-tcsetattr iport TCSANOW attr)))])
(unwind-protect (begin (echo-off) (proc iport)) (echo-on)))]
[else (proc iport)]))
#|
;; sample
(define (get-password)
(with-output-to-file
(cond-expand [gauche.os.windows "CON"] [else "/dev/tty"])
(lambda () (display "Password: ") (flush)))
(without-echoing #f read-line))
|#
;; mode should be either one of 'cooked, 'rare or 'raw
;; NB: Although we work on the given port and also calls PROC with port,
;; what's changed is actually a device connected to the port. There can
;; be more than one port connected to the same device, and I/O thru those
;; ports would also be affected.
;; TODO: What to do with Windows console?
(define (with-terminal-mode port mode proc)
(cond
[(sys-isatty port)
(let ()
(define saved-attr (sys-tcgetattr port))
(define new-attr
(rlet1 attr (sys-termios-copy saved-attr)
(case mode
[(raw)
(set! (~ attr'iflag)
(logand (~ attr'iflag)
(lognot (logior BRKINT ICRNL INPCK ISTRIP IXON))))
(set! (~ attr'oflag) (logand (~ attr'oflag) (lognot OPOST)))
(set! (~ attr'cflag) (logand (~ attr'cflag) (lognot CS8)))
(set! (~ attr'lflag)
(logand (~ attr'lflag)
(lognot (logior ECHO ICANON IEXTEN ISIG))))]
[(rare)
(set! (~ attr'iflag)
(logior BRKINT
(logand (~ attr'iflag)
(lognot (logior ICRNL INPCK ISTRIP IXON)))))
(set! (~ attr'oflag) (logand (~ attr'oflag) (lognot OPOST)))
(set! (~ attr'cflag) (logand (~ attr'cflag) (lognot CS8)))
(set! (~ attr'lflag)
(logior ISIG
(logand (~ attr'lflag)
(lognot (logior ECHO ICANON IEXTEN)))))]
[(cooked)
(set! (~ attr'iflag)
(logior (~ attr'iflag)
BRKINT ICRNL INPCK ISTRIP IXON))
(set! (~ attr'oflag) (logior (~ attr'oflag) OPOST))
(set! (~ attr'lflag)
(logior (~ attr'lflag) ECHO ICANON IEXTEN ISIG))]
[else
(error "terminal mode needs to be one of cooked, rare or raw, \
but got:" mode)])))
(define (set)
(sys-tcsetattr port TCSANOW new-attr))
(define (reset)
(sys-tcsetattr port TCSANOW saved-attr))
(unwind-protect (begin (set) (proc port)) (reset)))]
[else (proc port)]))