/usr/lib/s9fes/string-scan.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 | ; Scheme 9 from Empty Space, Function Library
; By Nils M Holm, 2010
; See the LICENSE file of the S9fES package for terms of use
;
; (string-scan char string) ==> integer | #f
; (string-ci-scan char string) ==> integer | #f
;
; (load-from-library "string-scan.scm")
;
; Scan STRING for CHAR. When STRING contains CHAR, return its position,
; otherwise return #F. STRING-CI-SCAN does the same but ignores case.
;
; Example: (string-scan #\y "xyz") ==> 1
(define (make-string-scan c=?)
(lambda (c s)
(let ((k (string-length s)))
(let loop ((i 0))
(cond ((>= i k)
#f)
((c=? c (string-ref s i))
i)
(else
(loop (+ 1 i))))))))
(define string-scan (make-string-scan char=?))
(define string-ci-scan (make-string-scan char-ci=?))
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