src/java.base/windows/native/libjava/JdkConsoleImpl_md.c

/*
 * Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

#include "jni.h"
#include "jni_util.h"
#include "jvm.h"
#include "jdk_internal_io_JdkConsoleImpl.h"

#include <stdlib.h>
#include <Wincon.h>

JNIEXPORT jboolean JNICALL
Java_jdk_internal_io_JdkConsoleImpl_echo(JNIEnv *env, jclass cls, jboolean on)
{
    DWORD fdwMode;
    jboolean old;
    HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);

    if (! GetConsoleMode(hStdIn, &fdwMode)) {
        JNU_ThrowIOExceptionWithLastError(env, "GetConsoleMode failed");
        return !on;
    }
    old = (fdwMode & ENABLE_ECHO_INPUT) != 0;
    if (on) {
        fdwMode |= ENABLE_ECHO_INPUT;
    } else {
        fdwMode &= ~ENABLE_ECHO_INPUT;
    }
    if (! SetConsoleMode(hStdIn, fdwMode)) {
        JNU_ThrowIOExceptionWithLastError(env, "SetConsoleMode failed");
    }
    return old;
}