source: trunk/j/src/org/armedbear/lisp/deposit-field.lisp @ 4454

Last change on this file since 4454 was 4454, checked in by piso, 18 years ago

Initial checkin.

File size: 1.1 KB
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1;;; deposit-field.lisp
2;;;
3;;; Copyright (C) 2003 Peter Graves
4;;; $Id: deposit-field.lisp,v 1.1 2003-10-19 03:09:29 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 "SYSTEM")
21
22(defun deposit-field (newbyte spec integer)
23  (let* ((size (byte-size spec))
24         (pos (byte-position spec))
25         (mask (ash (ldb (byte size 0) -1) pos)))
26    (logior (logand newbyte mask)
27            (logand integer (lognot mask)))))
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