RFR: 8272352: Java launcher can not parse Chinese character when system locale is set to UTF-8

[Roger Riggs]

On Wed, 27 Apr 2022 20:23:32 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Java runtime has been detecting the Windows system locale encoding using `GetLocaleInfo(GetSystemDefaultLCID(), LOCALE_IDEFAULTANSICODEPAGE, ...)`, but it returns the *legacy* ANSI code page value, e.g, 1252 for US-English. In order to detect whether the user has selected `UTF-8` as the default, the code page has to be queried with `GetACP()`.
> Also, the case if the call to `GetLocaleInfo` fails changed to fall back to `UTF-8` instead of `Cp1252`.

src/java.base/windows/native/libjava/java_props_md.c line 695:

> 693:                            &display_encoding);
> 694: 
> 695:             sprops.sun_jnu_encoding = getEncodingInternal(0);

How should NULL from `getEncodingInternal` be handled?  (only if malloc fails).
Perhaps just it should return the literal "UTF-8".

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PR: https://git.openjdk.java.net/jdk/pull/8434