Function parseOptionImpl

external/utf8-cpp-utils/test/doctest.h:6450–6482

the implementation of parseOption()

    // the implementation of parseOption()
    bool parseOptionImpl(int argc, const char* const* argv, const char* pattern, String* value) {
        // going from the end to the beginning and stopping on the first occurrence from the end
        for(int i = argc; i > 0; --i) {
            auto index = i - 1;
            auto temp = std::strstr(argv[index], pattern);
            if(temp && (value || strlen(temp) == strlen(pattern))) { //!OCLINT prefer early exits and continue
                // eliminate matches in which the chars before the option are not '-'
                bool noBadCharsFound = true;
                auto curr            = argv[index];
                while(curr != temp) {
                    if(*curr++ != '-') {
                        noBadCharsFound = false;
                        break;
                    }
                }
                if(noBadCharsFound && argv[index][0] == '-') {
                    if(value) {
                        // parsing the value of an option
                        temp += strlen(pattern);
                        const unsigned len = strlen(temp);
                        if(len) {
                            *value = temp;
                            return true;
                        }
                    } else {
                        // just a flag - no value
                        return true;
                    }
                }
            }
        }
        return false;
    }

    // parses an option and returns the string after the '=' character
    bool parseOption(int argc, const char* const* argv, const char* pattern, String* value = nullptr,