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80 lines
2.6 KiB
Scheme
80 lines
2.6 KiB
Scheme
;;; "getopt.scm" POSIX command argument processing
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;Copyright (C) 1993, 1994 Aubrey Jaffer
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;
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;Permission to copy this software, to redistribute it, and to use it
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;for any purpose is granted, subject to the following restrictions and
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;understandings.
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;
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;1. Any copy made of this software must include this copyright notice
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;in full.
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;
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;2. I have made no warrantee or representation that the operation of
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;this software will be error-free, and I am under no obligation to
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;provide any services, by way of maintenance, update, or otherwise.
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;
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;3. In conjunction with products arising from the use of this
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;material, there shall be no use of my name in any advertising,
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;promotional, or sales literature without prior written consent in
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;each case.
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(define getopt:scan #f)
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(define getopt:char #\-)
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(define getopt:opt #f)
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(define *optind* 1)
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(define *optarg* 0)
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(define (getopt argc argv optstring)
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(let ((opts (string->list optstring))
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(place #f)
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(arg #f)
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(argref (lambda () ((if (vector? argv) vector-ref list-ref)
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argv *optind*))))
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(and
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(cond ((and getopt:scan (not (string=? "" getopt:scan))) #t)
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((>= *optind* argc) #f)
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(else
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(set! arg (argref))
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(cond ((or (<= (string-length arg) 1)
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(not (char=? (string-ref arg 0) getopt:char)))
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#f)
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((and (= (string-length arg) 2)
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(char=? (string-ref arg 1) getopt:char))
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(set! *optind* (+ *optind* 1))
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#f)
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(else
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(set! getopt:scan
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(substring arg 1 (string-length arg)))
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#t))))
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(begin
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(set! getopt:opt (string-ref getopt:scan 0))
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(set! getopt:scan
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(substring getopt:scan 1 (string-length getopt:scan)))
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(if (string=? "" getopt:scan) (set! *optind* (+ *optind* 1)))
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(set! place (member getopt:opt opts))
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(cond ((not place) #\?)
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((or (null? (cdr place)) (not (char=? #\: (cadr place))))
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getopt:opt)
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((not (string=? "" getopt:scan))
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(set! *optarg* getopt:scan)
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(set! *optind* (+ *optind* 1))
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(set! getopt:scan #f)
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getopt:opt)
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((< *optind* argc)
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(set! *optarg* (argref))
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(set! *optind* (+ *optind* 1))
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getopt:opt)
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((and (not (null? opts)) (char=? #\: (car opts))) #\:)
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(else #\?))))))
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(define (getopt-- argc argv optstring)
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(let* ((opt (getopt argc argv (string-append optstring "-:")))
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(optarg *optarg*))
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(cond ((eqv? #\- opt) ;long option
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(do ((l (string-length *optarg*))
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(i 0 (+ 1 i)))
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((or (>= i l) (char=? #\= (string-ref optarg i)))
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(cond
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((>= i l) (set! *optarg* #f) optarg)
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(else (set! *optarg* (substring optarg (+ 1 i) l))
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(substring optarg 0 i))))))
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(else opt))))
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