Import Upstream version 2a6upstream/2a6

1 files changed, 80 insertions, 0 deletions

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+;;; "getopt.scm" POSIX command argument processing
+;Copyright (C) 1993, 1994 Aubrey Jaffer
+;
+;Permission to copy this software, to redistribute it, and to use it
+;for any purpose is granted, subject to the following restrictions and
+;understandings.
+;
+;1.  Any copy made of this software must include this copyright notice
+;in full.
+;
+;2.  I have made no warrantee or representation that the operation of
+;this software will be error-free, and I am under no obligation to
+;provide any services, by way of maintenance, update, or otherwise.
+;
+;3.  In conjunction with products arising from the use of this
+;material, there shall be no use of my name in any advertising,
+;promotional, or sales literature without prior written consent in
+;each case.
+
+(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 #\?))))))
+
+(define (getopt-- argc argv optstring)
+  (let* ((opt (getopt argc argv (string-append optstring "-:")))
+	 (optarg *optarg*))
+    (cond ((eqv? #\- opt)		;long option
+	   (do ((l (string-length *optarg*))
+		(i 0 (+ 1 i)))
+	       ((or (>= i l) (char=? #\= (string-ref optarg i)))
+		(cond
+		 ((>= i l) (set! *optarg* #f) optarg)
+		 (else (set! *optarg* (substring optarg (+ 1 i) l))
+		       (substring optarg 0 i))))))
+	  (else opt))))