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Defining with-in/output-from/to-file in terms of dynamic-wind.

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Alex Shinn 2011-12-20 00:58:27 +09:00
parent 8eb74156f9
commit 87970984c7
1 changed files with 16 additions and 16 deletions
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32
lib/init-7.scm
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@ -514,22 +514,6 @@
(close-output-port out)
res))
(define (with-input-from-file file thunk)
(let ((old-in (current-input-port))
(tmp-in (open-input-file file)))
(current-input-port tmp-in)
(let ((res (thunk)))
(current-input-port old-in)
res)))
(define (with-output-to-file file thunk)
(let ((old-out (current-output-port))
(tmp-out (open-output-file file)))
(current-output-port tmp-out)
(let ((res (thunk)))
(current-output-port old-out)
res)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; values
@ -603,6 +587,22 @@
(let ((dk (%dk)))
(%call/cc (lambda (k) (proc (lambda x (set-dk! dk) (k (%values x))))))))
(define (with-input-from-file file thunk)
(let ((old-in (current-input-port))
(tmp-in (open-input-file file)))
(dynamic-wind
(lambda () (current-input-port tmp-in))
thunk
(lambda () (current-input-port old-in)))))
(define (with-output-to-file file thunk)
(let ((old-out (current-output-port))
(tmp-out (open-output-file file)))
(dynamic-wind
(lambda () (current-output-port tmp-out))
thunk
(lambda () (current-output-port old-out)))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; syntax-rules