[Webkit-unassigned] [Bug 237573] New: Handle empty localeID in localeIDBufferForLanguageTagWithNullTerminator().

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237573

            Bug ID: 237573
           Summary: Handle empty localeID in
                    localeIDBufferForLanguageTagWithNullTerminator().
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

localeIDBufferForLanguageTagWithNullTerminator() uses uloc_forLanguageTag, and uloc_forLanguageTag can return an empty (0 length) localeID.  LocaleIDBuilder::initialize() uses localeIDBufferForLanguageTagWithNullTerminator() to return a buffer sized based on the localeID it contains.  However, when the localeID is not found, we currently erroneously return a non-empty buffer.  This patch fixes this by adding a length check, and returning an empty buffer if the localeID length is 0.

rdar://83326232

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