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/*
* ftruncate.java
*
* Copyright (C) 2004-2005 Peter Graves
* $Id$
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
// ### ftruncate number &optional divisor => quotient, remainder
// (defun ftruncate (number &optional (divisor 1))
// (multiple-value-bind (tru rem) (truncate number divisor)
// (values (float tru) rem)))
// "FFLOOR, FCEILING, FTRUNCATE, and FROUND handle arguments of different types
// in the following way: If number is a float, and divisor is not a float of
// longer format, then the first result is a float of the same type as number.
// Otherwise, the first result is of the type determined by contagion rules."
public final class ftruncate extends Primitive
{
private ftruncate()
{
super("ftruncate", "number &optional divisor");
}
@Override
public LispObject execute(LispObject arg)
{
final LispThread thread = LispThread.currentThread();
if (arg.zerop()) {
LispObject q = arg;
LispObject r;
if (arg instanceof DoubleFloat)
r = DoubleFloat.ZERO;
else
r = SingleFloat.ZERO;
return thread.setValues(q, r);
}
if (arg instanceof DoubleFloat) {
double d = ((DoubleFloat)arg).value;
if (Double.isInfinite(d) || Double.isNaN(d))
return thread.setValues(arg, new DoubleFloat(Double.NaN));
} else if (arg instanceof SingleFloat) {
float f = ((SingleFloat)arg).value;
if (Float.isInfinite(f) || Float.isNaN(f))
return thread.setValues(arg, new SingleFloat(Float.NaN));
}
LispObject q = arg.truncate(Fixnum.ONE); // an integer
if (arg instanceof DoubleFloat) {
if (q.zerop()) {
if (arg.minusp())
q = new DoubleFloat(-0.0);
else
q = new DoubleFloat(0.0);
} else if (q instanceof Fixnum)
q = new DoubleFloat(((Fixnum)q).value);
else
q = new DoubleFloat(((Bignum)q).doubleValue());
} else {
if (q.zerop()) {
if (arg.minusp())
q = new SingleFloat(-0.0f);
else
q = new SingleFloat(0.0f);
} else if (q instanceof Fixnum)
q = new SingleFloat(((Fixnum)q).value);
else
q = new SingleFloat(((Bignum)q).floatValue());
}
thread._values[0] = q;
return q;
}
@Override
public LispObject execute(LispObject first, LispObject second)
{
final LispThread thread = LispThread.currentThread();
if (first.zerop()) {
LispObject q = first;
LispObject r;
if (first instanceof DoubleFloat)
r = DoubleFloat.ZERO;
else
r = SingleFloat.ZERO;
return thread.setValues(q, r);
}
if (first instanceof DoubleFloat) {
double d1 = ((DoubleFloat)first).value;
if (Double.isInfinite(d1) || Double.isNaN(d1))
return thread.setValues(first, new DoubleFloat(Double.NaN));
} else if (first instanceof SingleFloat) {
float f1 = ((SingleFloat)first).value;
if (Float.isInfinite(f1) || Float.isNaN(f1))
return thread.setValues(first, new SingleFloat(Float.NaN));
}
LispObject q = first.truncate(second); // an integer
if (first instanceof DoubleFloat || second instanceof DoubleFloat) {
if (q.zerop()) {
if (first.minusp()) {
if (second.minusp())
q = new DoubleFloat(0.0);
else
q = new DoubleFloat(-0.0);
} else if (second.minusp())
q = new DoubleFloat(-0.0);
else
q = new DoubleFloat(0.0);
} else if (q instanceof Fixnum)
q = new DoubleFloat(((Fixnum)q).value);
else
q = new DoubleFloat(((Bignum)q).doubleValue());
} else {
if (q.zerop()) {
if (first.minusp()) {
if (second.minusp())
q = new SingleFloat(0.0f);
else
q = new SingleFloat(-0.0f);
} else if (second.minusp())
q = new SingleFloat(-0.0f);
else
q = new SingleFloat(0.0f);
} else if (q instanceof Fixnum)
q = new SingleFloat(((Fixnum)q).value);
else
q = new SingleFloat(((Bignum)q).floatValue());
}
thread._values[0] = q;
return q;
}
private static final Primitive FTRUNCATE = new ftruncate();
}
