01: /*
02: * floor.java
03: *
04: * Copyright (C) 2004 Peter Graves
05: * $Id: floor.java,v 1.1 2004/03/09 11:49:37 piso Exp $
06: *
07: * This program is free software; you can redistribute it and/or
08: * modify it under the terms of the GNU General Public License
09: * as published by the Free Software Foundation; either version 2
10: * of the License, or (at your option) any later version.
11: *
12: * This program is distributed in the hope that it will be useful,
13: * but WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15: * GNU General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with this program; if not, write to the Free Software
19: * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
20: */
21:
22: package org.armedbear.lisp;
23:
24: // ### floor number &optional divisor
25: public final class floor extends Primitive {
26: private floor() {
27: super ("floor", "number &optional divisor");
28: }
29:
30: public LispObject execute(LispObject number)
31: throws ConditionThrowable {
32: LispObject quotient = number.truncate(Fixnum.ONE);
33: final LispThread thread = LispThread.currentThread();
34: LispObject remainder = thread._values[1];
35: if (!remainder.zerop()) {
36: if (number.minusp()) {
37: quotient = quotient.decr();
38: remainder = remainder.incr();
39: thread._values[0] = quotient;
40: thread._values[1] = remainder;
41: }
42: }
43: return quotient;
44: }
45:
46: public LispObject execute(LispObject number, LispObject divisor)
47: throws ConditionThrowable {
48: LispObject quotient = number.truncate(divisor);
49: final LispThread thread = LispThread.currentThread();
50: LispObject remainder = thread._values[1];
51: boolean adjust = false;
52: if (!remainder.zerop()) {
53: if (divisor.minusp()) {
54: if (number.plusp())
55: adjust = true;
56: } else {
57: if (number.minusp())
58: adjust = true;
59: }
60: }
61: if (adjust) {
62: quotient = quotient.decr();
63: remainder = remainder.add(divisor);
64: thread._values[0] = quotient;
65: thread._values[1] = remainder;
66: }
67: return quotient;
68: }
69:
70: private static final Primitive FLOOR = new floor();
71: }
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