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/*******************************************************************************
* Copyright (c) 2000, 2011 QNX Software Systems and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* QNX Software Systems - Initial API and implementation
* Wind River Systems - bug 286162
*******************************************************************************/
package org.eclipse.cdt.utils.pty;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.cdt.utils.pty.PTY.MasterFD;
class PTYInputStream extends InputStream {
MasterFD master;
/**
* From a Unix valid file descriptor set a Reader.
* @param fd file descriptor.
*/
public PTYInputStream(MasterFD fd) {
master = fd;
}
/**
* Implementation of read for the InputStream.
*
* @exception IOException on error.
*/
@Override
public int read() throws IOException {
byte b[] = new byte[1];
if (1 != read(b, 0, 1))
return -1;
return b[0];
}
/**
* @see InputStream#read(byte[], int, int)
*/
@Override
public int read(byte[] buf, int off, int len) throws IOException {
if (buf == null) {
throw new NullPointerException();
} else if ((off < 0) || (off > buf.length)
|| (len < 0) || ((off + len) > buf.length)
|| ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return 0;
}
byte[] tmpBuf = new byte[len];
len = read0(master.getFD(), tmpBuf, len);
if (len <= 0)
return -1;
System.arraycopy(tmpBuf, 0, buf, off, len);
return len;
}
/**
* Close the Reader
* @exception IOException on error.
*/
@Override
public void close() throws IOException {
if (master.getFD() == -1)
return;
close0(master.getFD());
// ignore error on close - see bug 286162
// if (status == -1)
// throw new IOException(CCorePlugin.getResourceString("Util.exception.closeError")); //$NON-NLS-1$
master.setFD(-1);
}
@Override
protected void finalize() throws IOException {
close();
}
private native int read0(int fd, byte[] buf, int len) throws IOException;
private native int close0(int fd) throws IOException;
static {
System.loadLibrary("pty"); //$NON-NLS-1$
}
}
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