source: trunk/j/src/org/armedbear/lisp/copy-list.lisp @ 9266

Last change on this file since 9266 was 2532, checked in by piso, 18 years ago

Initial checkin.

File size: 1.1 KB
Line 
1;;; copy-list.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: copy-list.lisp,v 1.1 2003-06-22 18:18:18 piso Exp $
5;;;
6;;; This program is free software; you can redistribute it and/or
7;;; modify it under the terms of the GNU General Public License
8;;; as published by the Free Software Foundation; either version 2
9;;; of the License, or (at your option) any later version.
10;;;
11;;; This program is distributed in the hope that it will be useful,
12;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
13;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14;;; GNU General Public License for more details.
15;;;
16;;; You should have received a copy of the GNU General Public License
17;;; along with this program; if not, write to the Free Software
18;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
19
20(in-package "COMMON-LISP")
21
22(defun copy-list (list)
23  (if (atom list)
24      list
25      (let ((result (list (car list))))
26  (do ((x (cdr list) (cdr x))
27       (splice result
28         (cdr (rplacd splice (cons (car x) '())))))
29            ((atom x)
30             (unless (null x)
31               (rplacd splice x))))
32  result)))
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