/usr/lib/s9fes/subvector.scm is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2010
; See the LICENSE file of the S9fES package for terms of use
;
; (subvector vector integer1 integer2) ==> vector
; (vector-copy vector) ==> vector
;
; SUBVECTOR returns a fresh vector formed from the members of VECTOR
; beginning with index INTEGER1 (inclusive) and ending with index
; INTEGER2 (exclusive).
;
; (Vector-copy v) is shorthand for (subvector v 0 (vector-length v)).
;
; Example: (subvector '#(a b c d e) 2 4) ==> #(c d)
; (subvector '#(a b c d e) 2 2) ==> #()
; (vector-copy '#(a b c)) ==> #(a b c)
(define (subvector v p0 pn)
(let ((k (vector-length v)))
(cond ((<= 0 p0 pn k)
(let ((n (make-vector (- pn p0))))
(do ((i p0 (+ 1 i))
(j 0 (+ 1 j)))
((= i pn)
n)
(vector-set! n j (vector-ref v i)))))
(else
(error "subvector: bad range" (list p0 pn))))))
(define (vector-copy v)
(subvector v 0 (vector-length v)))
|