RFR: 8211163: UNIX version of Java_java_io_Console_echo does not return a clean boolean

[Andrew Haley]

Java_java_io_Console_echo looks like this:

JNIEXPORT jboolean JNICALL
Java_java_io_Console_echo(JNIEnv *env, jclass cls, jboolean on)
{
    DWORD fdwMode;
    jboolean old;
    ...
    old = (fdwMode & ENABLE_ECHO_INPUT);
    ...
    return old;
}

It only works by accident. jboolean is an unsigned byte.
ENABLE_ECHO_INPUT on the systems I know of is 0000010, so fdwMode &
ENABLE_ECHO_INPUT fits into the result, but only by accident. We
should do things properly and return a clean boolean.

Note that the Windows version of the code is correct: I assume the
UNIX version is an oversight.

https://bugs.openjdk.java.net/browse/JDK-8211163
http://cr.openjdk.java.net/~aph/8211163/

OK?

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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