Comment by jhallenworld

Should we not be using wchar_t strings in modern C?

    int main(int argc, char *argv[]) {
        wchar_t buf[100];
        wprintf(L"Hello, world!\ntype something>");
        if (fgetws(buf, 100, stdin))
            wprintf(L"You typed '%ls'\n", buf);
        if (argv[1]) {
            char *s = argv[1];
            /* Convert char string to wchar_t string */
            size_t len = mbsrtowcs(buf, &s, 99, NULL);
            if (len != (size_t)-1) {
                buf[len] = 0;
                wprintf(L"argv[1] is '%ls'\n", buf);
            }
        return 0;
    }

It's a pain, but the advantage is access to iswalpha() and friends.