RFR (S) 8049300: jjs scripting: need way to quote $EXEC command arguments to protect spaces

[Michael Haupt]

Dear all,

please review and sponsor this change.
Webrev: http://cr.openjdk.java.net/~mhaupt/8049300/webrev.00
RFE: https://bugs.openjdk.java.net/browse/JDK-8049300

There are several ways in which paths can contain spaces (quoting with "" or '', or escaping). The implementation of the $EXEC command would tokenise using a plain StringTokenizer, which splits a string at space characters regardless of quoting. The new implementation employs a StreamTokenizer and some extra logic to handle escaped spaces.

Thanks,

Michael

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