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+#| -*-Scheme-*-
+
+$Id: ntdir.scm,v 1.1 1997/01/05 23:43:10 cph Exp $
+
+Copyright (c) 1997 Massachusetts Institute of Technology
+
+This material was developed by the Scheme project at the Massachusetts
+Institute of Technology, Department of Electrical Engineering and
+Computer Science.  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. Users of this software agree to make their best efforts (a) to
+return to the MIT Scheme project any improvements or extensions that
+they make, so that these may be included in future releases; and (b)
+to inform MIT of noteworthy uses of this software.
+
+3. All materials developed as a consequence of the use of this
+software shall duly acknowledge such use, in accordance with the usual
+standards of acknowledging credit in academic research.
+
+4. MIT has made no warrantee or representation that the operation of
+this software will be error-free, and MIT is under no obligation to
+provide any services, by way of maintenance, update, or otherwise.
+
+5. In conjunction with products arising from the use of this material,
+there shall be no use of the name of the Massachusetts Institute of
+Technology nor of any adaptation thereof in any advertising,
+promotional, or sales literature without prior written consent from
+MIT in each case. |#
+
+;;;; Directory Operations -- OS/2
+;;; package: (runtime directory)
+
+(declare (usual-integrations))
+\f
+(define *expand-directory-prefixes?* #t)
+
+(define (directory-read pattern #!optional sort? full?)
+  (let ((sort? (if (default-object? sort?) #t sort?))
+       (full? (if (default-object? full?) #f full?)))
+    (let ((entries
+          (if full?
+              (directory-read-full pattern)
+              (directory-read-nosort pattern))))
+      (if (not sort?)
+         entries
+         (sort entries
+               (if full?
+                   (lambda (x y) (pathname<? (car x) (car y)))
+                   pathname<?))))))
+
+(define (pathname<? x y)
+  (string-ci<? (file-namestring x) (file-namestring y)))
+
+(define (directory-read-nosort pattern)
+  (let ((pattern (merge-pathnames pattern)))
+    (map (let ((directory-path (directory-pathname pattern)))
+          (lambda (pathname)
+            (merge-pathnames pathname directory-path)))
+        (let ((fnames (generate-directory-pathnames pattern)))
+          (fluid-let ((*expand-directory-prefixes?* #f))
+            (map ->pathname fnames))))))
+
+(define (generate-directory-pathnames pathname)
+  (let ((channel (directory-channel-open (->namestring pathname))))
+    (let loop ((result '()))
+      (let ((name (directory-channel-read channel)))
+       (if name
+           (loop (cons name result))
+           (begin
+             (directory-channel-close channel)
+             result))))))
+
+(define (directory-read-full pattern)
+  (let ((pattern (merge-pathnames pattern)))
+    (map (let ((directory-path (directory-pathname pattern)))
+          (lambda (entry)
+            (cons (merge-pathnames (car entry) directory-path)
+                  (cdr entry))))
+        (let ((entries (generate-directory-entries pattern)))
+          (fluid-let ((*expand-directory-prefixes?* #f))
+            (map (lambda (entry) (cons (->pathname (car entry)) (cdr entry)))
+                 entries))))))
+
+(define (generate-directory-entries pathname)
+  (let ((channel (directory-channel-open (->namestring pathname))))
+    (let loop ((result '()))
+      (let ((entry (directory-channel-read-entry channel)))
+       (if entry
+           (loop (cons entry result))
+           (begin
+             (directory-channel-close channel)
+             result))))))
+
+(define (directory-channel-read-entry channel)
+  ((ucode-primitive win32-directory-read 1)
+   (directory-channel/descriptor channel)))
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