01: /*
02: * ceiling.java
03: *
04: * Copyright (C) 2004 Peter Graves
05: * $Id: ceiling.java,v 1.1 2004/08/15 11:16:08 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: // ### ceiling number &optional divisor
25: public final class ceiling extends Primitive {
26: private ceiling() {
27: super ("ceiling", "number &optional divisor");
28: }
29:
30: public LispObject execute(LispObject arg) throws ConditionThrowable {
31: return execute(arg, Fixnum.ONE);
32: }
33:
34: public LispObject execute(LispObject first, LispObject second)
35: throws ConditionThrowable {
36: LispObject quotient = first.truncate(second);
37: final LispThread thread = LispThread.currentThread();
38: LispObject remainder = thread._values[1];
39: if (remainder.zerop())
40: return quotient;
41: if (second.minusp()) {
42: if (first.plusp())
43: return quotient;
44: } else {
45: if (first.minusp())
46: return quotient;
47: }
48: quotient = quotient.incr();
49: thread._values[0] = quotient;
50: thread._values[1] = remainder.subtract(second);
51: return quotient;
52: }
53:
54: private static final Primitive CEILING = new ceiling();
55: }
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