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fixing string-copy!

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This commit is contained in:
Alex Shinn 2012-11-01 22:41:47 +09:00
parent c8b5e7343f
commit c8f3ba78a8
1 changed files with 5 additions and 4 deletions
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9
lib/scheme/extras.scm
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@ -190,10 +190,11 @@
;; Never use this!
(define (string-copy! to at from . o)
(let ((start (if (pair? o) (car o) 0))
(end (if (and (pair? o) (pair? (cdr o))) (cadr o) (string-length from))))
(do ((i at (+ i 1)) (j start (+ i 1)))
((>= j end))
(let* ((start (if (pair? o) (car o) 0))
(end (if (and (pair? o) (pair? (cdr o))) (cadr o) (string-length from)))
(limit (min end (+ start (- (string-length to) at)))))
(do ((i at (+ i 1)) (j start (+ j 1)))
((>= j limit))
(string-set! to i (string-ref from j)))))
(define truncate-quotient quotient)