gistfile1.hpp

size_t memspn(const char* s, size_t len, const char* charset) {
    for (size_t i = 0; i < len; ++i) {
        bool found = false;
        for (const char* p = charset; *p != 0; ++p) {
            if (s[i] == *p) {
                found = true;
                break;
            }
        }
        if (!found)
            return i;
    }
    return len;
}