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Question about mb_metastrlen

Hello,
the function counts bytes in last incomplete wide character:

        ret = mbrtowc(&wc, &inchar, 1, &mb_shiftstate);
        if (ret == MB_INCOMPLETE) {
            num_in_char++;
        } else {

When returning, it makes use of the count:

    /* If incomplete, treat remainder as trailing single bytes */
    return num + num_in_char;

Strings are stored in wchar_t arrays. The incomplete character will
occupy single index, correct? So maybe the return should be:

    return num + ( num_in_char > 0 ? 1 : 0 );

?

Best regards,
Sebastian Gniazdowski
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