Dealing with ctype.h integer overflow

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What is the proper way to deal with character values which when casted to an unsigned char fall between {INT_MAX + 1 ... UCHAR_MAX} where UCHAR_MAX is greater than INT_MAX.

Code:
int is_digit2(char c) {
    unsigned char uchar = c;
    if(uchar > INT_MAX)
        return MAYBE;
    return isdigit(uchar) ? YES : NO;
}
 

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