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Use buffering to speed up copy-file util. #32

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Use buffering to speed up copy-file util. #32

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11 changes: 7 additions & 4 deletions utils.lisp
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Original file line number Diff line number Diff line change
Expand Up @@ -183,11 +183,14 @@ location."
:test #'string=))

(defun copy-file (input output &key (if-exists :supersede))
(with-open-file (input-stream input)
(with-open-file (output-stream output :direction :output
(with-open-file (input-stream input :element-type '(unsigned-byte 8))
(with-open-file (output-stream output :element-type '(unsigned-byte 8)
:direction :output
:if-exists if-exists)
(loop for char = (read-char input-stream nil)
while char do (write-char char output-stream)))))
(let ((buf (make-array 4096 :element-type (stream-element-type input-stream))))
(loop for pos = (read-sequence buf input-stream)
while (plusp pos)
do (write-sequence buf output-stream :end pos))))))

(defun file-lines (file)
(with-open-file (stream file)
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