[Bug 25251] New: Multi-byte characters handled incorrectly by MSVCRT_isleadbyte()

http://bugs.winehq.org/show_bug.cgi?id=25251

Summary: Multi-byte characters handled incorrectly by
                    MSVCRT_isleadbyte()
           Product: Wine
           Version: 1.3.7
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=32067)
 --> (http://bugs.winehq.org/attachment.cgi?id=32067)
Possible fix

Here's a case that can be used to test with:
_mbspbrk("C:\age\マブラヴオルタネイティヴ\Alternative.rio.ici", ";,|*?"<>{}[]");

None of the Japanese characters are interpreted as multi-byte by
MSVCRT_isleadbyte() so when _mbspbrk reaches 'マ' (0x837D) it matches the '}'
(0x7D) from the match string with the second byte of 'マ'.

Only tested in Japanese locale but probably happens with others. Attached is a
simple fix that fixes the 2 games that I tested.