Function is_ascii_alpha

src/models/miotts/session.cpp:257–259

};

bool is_ascii_alpha(unsigned char ch) {
    return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z');
}

bool is_ascii_alnum_or_apostrophe(unsigned char ch) {
    return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '\'';