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/*
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* Copyright (c) 2002-2019, the original author or authors.
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*
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* This software is distributable under the BSD license. See the terms of the
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* BSD license in the documentation provided with this software.
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*/
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52938
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package jdk.internal.org.jline.terminal.impl;
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import jdk.internal.org.jline.terminal.Attributes;
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import jdk.internal.org.jline.terminal.spi.Pty;
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import jdk.internal.org.jline.utils.NonBlockingInputStream;
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import java.io.IOError;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InterruptedIOException;
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import static jdk.internal.org.jline.terminal.TerminalBuilder.PROP_NON_BLOCKING_READS;
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public abstract class AbstractPty implements Pty {
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private Attributes current;
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@Override
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public void setAttr(Attributes attr) throws IOException {
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current = new Attributes(attr);
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doSetAttr(attr);
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}
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@Override
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public InputStream getSlaveInput() throws IOException {
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InputStream si = doGetSlaveInput();
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if (Boolean.parseBoolean(System.getProperty(PROP_NON_BLOCKING_READS, "true"))) {
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return new PtyInputStream(si);
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} else {
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return si;
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}
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}
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protected abstract void doSetAttr(Attributes attr) throws IOException;
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protected abstract InputStream doGetSlaveInput() throws IOException;
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protected void checkInterrupted() throws InterruptedIOException {
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if (Thread.interrupted()) {
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throw new InterruptedIOException();
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}
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}
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class PtyInputStream extends NonBlockingInputStream {
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final InputStream in;
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int c = 0;
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PtyInputStream(InputStream in) {
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this.in = in;
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}
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@Override
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public int read(long timeout, boolean isPeek) throws IOException {
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checkInterrupted();
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if (c != 0) {
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int r = c;
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if (!isPeek) {
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c = 0;
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}
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return r;
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} else {
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setNonBlocking();
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long start = System.currentTimeMillis();
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while (true) {
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int r = in.read();
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if (r >= 0) {
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if (isPeek) {
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c = r;
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}
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return r;
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}
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checkInterrupted();
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long cur = System.currentTimeMillis();
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if (timeout > 0 && cur - start > timeout) {
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return NonBlockingInputStream.READ_EXPIRED;
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}
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}
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}
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}
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private void setNonBlocking() {
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if (current == null
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|| current.getControlChar(Attributes.ControlChar.VMIN) != 0
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|| current.getControlChar(Attributes.ControlChar.VTIME) != 1) {
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try {
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Attributes attr = getAttr();
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attr.setControlChar(Attributes.ControlChar.VMIN, 0);
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attr.setControlChar(Attributes.ControlChar.VTIME, 1);
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setAttr(attr);
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} catch (IOException e) {
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throw new IOError(e);
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}
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}
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}
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}
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}
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