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Java > Open Source Codes > org > armedbear > lisp > ftruncate


1 /*
2  * ftruncate.java
3  *
4  * Copyright (C) 2004 Peter Graves
5  * $Id: ftruncate.java,v 1.3 2004/06/05 02:08:28 piso Exp $
6  *
7  * This program is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU General Public License
9  * 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 // ### ftruncate number &optional divisor => quotient, remainder
25
// (defun ftruncate (number &optional (divisor 1))
26
// (multiple-value-bind (tru rem) (truncate number divisor)
27
// (values (float tru) rem)))
28
public final class ftruncate extends Primitive
29 {
30     private ftruncate()
31     {
32         super("ftruncate", "number &optional divisor");
33     }
34
35     public LispObject execute(LispObject arg) throws ConditionThrowable
36     {
37         if (arg instanceof LispFloat)
38             return ((LispFloat)arg).ftruncate(Fixnum.ONE);
39         LispObject q = arg.truncate(Fixnum.ONE); // an integer
40
if (q instanceof Fixnum)
41             q = new LispFloat(((Fixnum)q).value);
42         else
43             q = new LispFloat(((Bignum)q).floatValue());
44         LispThread.currentThread()._values[0] = q;
45         return q;
46     }
47
48     public LispObject execute(LispObject first, LispObject second)
49         throws ConditionThrowable
50     {
51         if (first instanceof LispFloat)
52             return ((LispFloat)first).ftruncate(second);
53         LispObject q = first.truncate(second); // an integer
54
if (q instanceof Fixnum)
55             q = new LispFloat(((Fixnum)q).value);
56         else
57             q = new LispFloat(((Bignum)q).floatValue());
58         LispThread.currentThread()._values[0] = q;
59         return q;
60     }
61
62     private static final Primitive FTRUNCATE = new ftruncate();
63 }
64
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