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;;;; r4rs.scm --- definitions needed for libguile to be R4RS compliant
;;;; Jim Blandy <jimb@cyclic.com> --- October 1996
;;;; Copyright (C) 1996 Free Software Foundation, Inc.
;;;;
;;;; 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, 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 software; see the file COPYING. If not, write to
;;;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
;;;; apply and call-with-current-continuation
;;; These turn syntax, @apply and @call-with-current-continuation,
;;; into procedures. If someone knows why they have to be syntax to
;;; begin with, please fix this comment.
(set! apply (lambda (fun . args) (@apply fun (apply:nconc2last args))))
(define (call-with-current-continuation proc)
(@call-with-current-continuation proc))
;;;; Basic Port Code
;;; Specifically, the parts of the low-level port code that are written in
;;; Scheme rather than C.
;;;
;;; WARNING: the parts of this interface that refer to file ports
;;; are going away. It would be gone already except that it is used
;;; "internally" in a few places.
;; OPEN_READ, OPEN_WRITE, and OPEN_BOTH are used to request the proper
;; mode to open files in. MSDOS does carraige return - newline
;; translation if not opened in `b' mode.
;;
(define OPEN_READ (case (software-type)
((MS-DOS WINDOWS ATARIST) "rb")
(else "r")))
(define OPEN_WRITE (case (software-type)
((MS-DOS WINDOWS ATARIST) "wb")
(else "w")))
(define OPEN_BOTH (case (software-type)
((MS-DOS WINDOWS ATARIST) "r+b")
(else "r+")))
(define *null-device* "/dev/null")
(define (open-input-file str)
(open-file str OPEN_READ))
(define (open-output-file str)
(open-file str OPEN_WRITE))
(define (open-io-file str) (open-file str OPEN_BOTH))
(define close-input-port close-port)
(define close-output-port close-port)
(define close-io-port close-port)
(define (call-with-input-file str proc)
(let* ((file (open-input-file str))
(ans (proc file)))
(close-input-port file)
ans))
(define (call-with-output-file str proc)
(let* ((file (open-output-file str))
(ans (proc file)))
(close-output-port file)
ans))
(define (with-input-from-port port thunk)
(let* ((swaports (lambda () (set! port (set-current-input-port port)))))
(dynamic-wind swaports thunk swaports)))
(define (with-output-to-port port thunk)
(let* ((swaports (lambda () (set! port (set-current-output-port port)))))
(dynamic-wind swaports thunk swaports)))
(define (with-error-to-port port thunk)
(let* ((swaports (lambda () (set! port (set-current-error-port port)))))
(dynamic-wind swaports thunk swaports)))
(define (with-input-from-file file thunk)
(let* ((nport (open-input-file file))
(ans (with-input-from-port nport thunk)))
(close-port nport)
ans))
(define (with-output-to-file file thunk)
(let* ((nport (open-output-file file))
(ans (with-output-to-port nport thunk)))
(close-port nport)
ans))
(define (with-error-to-file file thunk)
(let* ((nport (open-output-file file))
(ans (with-error-to-port nport thunk)))
(close-port nport)
ans))
(define (with-input-from-string string thunk)
(call-with-input-string string
(lambda (p) (with-input-from-port p thunk))))
(define (with-output-to-string thunk)
(call-with-output-string
(lambda (p) (with-output-to-port p thunk))))
(define (with-error-to-string thunk)
(call-with-output-string
(lambda (p) (with-error-to-port p thunk))))
(define the-eof-object (call-with-input-string "" (lambda (p) (read-char p))))
;;;; Loading
(if (not (defined? '%load-verbosely))
(define %load-verbosely #f))
(define (assert-load-verbosity v) (set! %load-verbosely v))
(define (%load-announce file)
(if %load-verbosely
(with-output-to-port (current-error-port)
(lambda ()
(display ";;; ")
(display "loading ")
(display file)
(newline)
(force-output)))))
(set! %load-hook %load-announce)
;;; If we load boot-9.scm, it provides a definition for this which is
;;; more sophisticated.
(define read-sharp #f)
(define (load name)
(start-stack 'load-stack
(primitive-load name #t read-sharp)))
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