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- ;;;; r4rs.scm --- definitions needed for libguile to be R4RS compliant
- ;;;; Jim Blandy <jimb@cyclic.com> --- October 1996
-
- ;;;; Copyright (C) 1996, 1997, 1998 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, Inc., 59 Temple Place, Suite 330,
- ;;;; Boston, MA 02111-1307 USA
-
-
- ;;;; apply and call-with-current-continuation
-
- ;;; We want these to be tail-recursive, so instead of using primitive
- ;;; procedures, we define them as closures in terms of the primitive
- ;;; macros @apply and @call-with-current-continuation.
- (set! apply (lambda (fun . args) (@apply fun (apply:nconc2last args))))
- (set-procedure-property! apply 'name 'apply)
- (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.
- ;;;
- ;;; If we want to support systems that do CRLF->LF translation, like
- ;;; Windows, then we should have a symbol in scmconfig.h made visible
- ;;; to the Scheme level that we can test here, and autoconf magic to
- ;;; #define it when appropriate. Windows will probably just have a
- ;;; hand-generated scmconfig.h file.
- (define OPEN_READ "r")
- (define OPEN_WRITE "w")
- (define OPEN_BOTH "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)
-
- (define (load name)
- (start-stack 'load-stack
- (primitive-load name)))
-