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Turnbull China Bikeride
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Turnbull China Bikeride - Disc 2.iso
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SCM4E1
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!Scm
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getopt
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1993-09-11
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1KB
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50 lines
(define getopt:scan #f)
(define getopt:char #\-)
(define getopt:opt #f)
(define *optind* 1)
(define *optarg* 0)
(define (getopt argc argv optstring)
(let ((opts (string->list optstring))
(place #f)
(arg #f)
(argref (lambda () ((if (vector? argv) vector-ref list-ref)
argv *optind*))))
(and
(cond ((and getopt:scan (not (string=? "" getopt:scan))) #t)
((>= *optind* argc) #f)
(else
(set! arg (argref))
(cond ((or (<= (string-length arg) 1)
(not (char=? (string-ref arg 0) getopt:char)))
#f)
((and (= (string-length arg) 2)
(char=? (string-ref arg 1) getopt:char))
(set! *optind* (+ *optind* 1))
#f)
(else
(set! getopt:scan
(substring arg 1 (string-length arg)))
#t))))
(begin
(set! getopt:opt (string-ref getopt:scan 0))
(set! getopt:scan
(substring getopt:scan 1 (string-length getopt:scan)))
(if (string=? "" getopt:scan) (set! *optind* (+ *optind* 1)))
(set! place (member getopt:opt opts))
(cond ((not place) #\?)
((or (null? (cdr place)) (not (char=? #\: (cadr place))))
getopt:opt)
((not (string=? "" getopt:scan))
(set! *optarg* getopt:scan)
(set! *optind* (+ *optind* 1))
(set! getopt:scan #f)
getopt:opt)
((< *optind* argc)
(set! *optarg* (argref))
(set! *optind* (+ *optind* 1))
getopt:opt)
((and (not (null? opts)) (char=? #\: (car opts))) #\:)
(else #\?))))))