[Bug 59409] New: msvcrt: scanf scanset character ranges with high bytes (\x80-\xff) broken due to signed char comparison in scanf.h

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=59409

            Bug ID: 59409
           Summary: msvcrt: scanf scanset character ranges with high bytes
                    (\x80-\xff) broken due to signed char comparison in
                    scanf.h
           Product: Wine
           Version: 11.2
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: msvcrt
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

Created attachment 80377
  --> http://bugs.winehq.org/attachment.cgi?id=80377
repro

The %[a-z]-style scanset range handling in scanf.h uses a signed comparison of
format string characters, causing all ranges that include bytes above \x7f
(e.g., %1[\x01-\xff]) to fail to match anything. This differs from native
MSVCRT behavior and from other C libraries (glibc, etc) which handle this
correctly.

Affected code in dlls/msvcrt/scanf.h:

```c
if (format[0] < format[2])
    RtlSetBits(&bitMask, format[0], format[2] - format[0] + 1);
else
    RtlSetBits(&bitMask, format[2], format[0] - format[2] + 1);
```

On x86/x64 chars are defined as signed so the comparison and subtractions needs
to be handles with casting to unsigned char.

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