RFR 8187772 : JVM crash when currency set on MacOS 10.10 and earlier

[Brent Christian]

Thanks, Naoto.  An automated test run looked fine, so I've pushed this 
change.

-Brent

On 10/12/17 12:38 PM, Naoto Sato wrote:
> Looks fine, Brent.
> 
> Naoto
> 
> On 10/12/17 11:52 AM, Brent Christian wrote:
>> Hi,
>>
>> Please review my change to prevent a startup crash on earlier versions 
>> of MacOS.
>>
>>     Bug: https://bugs.openjdk.java.net/browse/JDK-8187772
>> Webrev: http://cr.openjdk.java.net/~bchristi/8187772/webrev.00/
>>
>> When a non-default currency is set in the Language & Region control 
>> panel, it's reflected as a variant in the locale identifier string.  
>> For example, "en_US at currency=RUB" for U.S. English using the Russian 
>> rubles currency.
>>
>> convertToPOSIXLocale() is not expecting such variants, nor such a long 
>> string.  The result is a SEGV from memmove() on line 161.  (Additional 
>> details are in the bug report.)
>>
>> The fix truncates the string passed to convertToPOSIXLocale() before 
>> any '@'-denoted variant tags.
>>
>> FWIW, the crash only happens on MacOS 10.10 and earlier because later 
>> versions of MacOS always return a region along with the language (line 
>> 65), so we don't need to query the locale identifier (line 84) to 
>> determine the region (hyphenPos is never NULL on line 82).
>>
>> Thanks,
>> -Brent