wctype.c

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#include <string.h>
#include <wctype.h>

wctype_t wctype(const char* s)
{
    wctype_t i;
    const char* p;
    /* order must match! */
    static const char names[] = "alnum\0"
                                "alpha\0"
                                "blank\0"
                                "cntrl\0"
                                "digit\0"
                                "graph\0"
                                "lower\0"
                                "print\0"
                                "punct\0"
                                "space\0"
                                "upper\0"
                                "xdigit";
    for(i = 1, p = names; *p; i++, p += 6)
    {
        if(*s == *p && !strcmp(s, p))
        {
            return i;
        }
    }
    return 0;
}