[Bug 1324] New: - mbtowc returns 0 erroneously

http://bugs.winehq.com/show_bug.cgi?id=1324

Summary: mbtowc returns 0 erroneously
           Product: Wine
           Version: 20030219
          Platform: PC
        OS/Version: Windows NT
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: wine-misc
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Calling mbtowc to determine if text is UTF8 with an ascii string returns zero(0)
as the number of character converted. A return value of zero should only occur
if the data being converted was a null which is not the case.

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