[Bug 1002106] New: Bugs in vfscanf.cxx to deal with utf-8

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http://bugs.ecos.sourceware.org/show_bug.cgi?id=1002106

            Bug ID: 1002106
           Summary: Bugs in vfscanf.cxx to deal with utf-8
           Product: eCos
           Version: 3.0
            Target: All
 Architecture/Host_ Other
                OS:
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: C library
          Assignee: unassigned@bugs.ecos.sourceware.org
          Reporter: 414256we@gmail.com
        QA Contact: ecos-bugs@ecos.sourceware.org
                CC: ecos-bugs@ecos.sourceware.org

Problem:
    vfscanf have problem to deal with string in utf-8 format. 
Analyze:
    In function:
        externC int
            vfscanf (FILE *fp, const char *fmt0, va_list ap) __THROW {
                        u_char *fmt = (u_char *) fmt0;

        It declared that:
            char ccltab[256];
            char curr_byte;
        When a byte's highest bit(the sign bit) is set(e.g. 0xe5), doing the
following conversion:
            (int)*CURR_POS
        it surely will generates an integer that is larger than 256( Recall,
signed bit extension).
        While try to combine it with:
            ccltab[(int)*CURR_POS]
        a fairly bug yields.

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