source: trunk/j/src/org/armedbear/lisp/ldiff.lisp @ 11297

Last change on this file since 11297 was 11297, checked in by ehuelsmann, 13 years ago

Set Id keyword for expansion.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Id
File size: 1.2 KB
Line 
1;;; ldiff.lisp
2;;;
3;;; Copyright (C) 2003-2005 Peter Graves
4;;; $Id: ldiff.lisp 11297 2008-08-31 13:26:45Z ehuelsmann $
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;;; Adapted from SBCL.
21
22(in-package #:system)
23
24(defun ldiff (list object)
25  (require-type list 'list)
26  (do* ((list list (cdr list))
27  (result (list ()))
28  (splice result))
29       ((atom list)
30        (if (eql list object)
31            (cdr result)
32            (progn (rplacd splice list) (cdr result))))
33    (if (eql list object)
34  (return (cdr result))
35  (setq splice (cdr (rplacd splice (list (car list))))))))
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