String#unpack with "@" pattern works incorrectly
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Key: JRUBY-1790
URL: http://jira.codehaus.org/browse/JRUBY-1790
Project: JRuby
Issue Type: Bug
Components: Core Classes/Modules
Affects Versions: JRuby 1.x
Environment: Latest JRuby 1.1b1 from trunk
Reporter: Vladimir Sizikov
Attachments: string-unpack-at.patch
Consider the following:
{noformat}
"abc".unpack("@*")
{noformat}
This returns [] on MRI, but fails hard with JRuby:
Exception in thread "main" java.lang.IllegalArgumentException
at java.nio.Buffer.position(Buffer.java:218)
at org.jruby.util.Pack.unpack(Pack.java:652)
at org.jruby.RubyString.unpack(RubyString.java:3454)
Also:
{noformat}
"abc".unpack("@10")
{noformat}
Throws ArgumentError in MRI, but throws internal JRuby exception in JRuby:
Exception in thread "main" java.lang.IllegalArgumentException
at java.nio.Buffer.position(Buffer.java:218)
at org.jruby.util.Pack.unpack(Pack.java:652)
at org.jruby.RubyString.unpack(RubyString.java:3454)
This also leads to uncaught exception during Rubinius spec runs, which is
really bad and needs to be fixed ASAP.
The provided patch (with regression tests) fixes the problem.
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