Method read_line

src/filemanager.cpp:93–143

// ---------------------------------------------------------------------------

std::string File::read_line(size_t maxLen, bool &maxLenReached,
                            bool &eofReached) {
    constexpr size_t MAX_MAXLEN = 1024 * 1024;
    maxLen = std::min(maxLen, MAX_MAXLEN);
    while (true) {
        // Consume existing lines in buffer
        size_t pos = readLineBuffer_.find_first_of("\r\n");
        if (pos != std::string::npos) {
            if (pos > maxLen) {
                std::string ret(readLineBuffer_.substr(0, maxLen));
                readLineBuffer_ = readLineBuffer_.substr(maxLen);
                maxLenReached = true;
                eofReached = false;
                return ret;
            }
            std::string ret(readLineBuffer_.substr(0, pos));
            if (readLineBuffer_[pos] == '\r' &&
                readLineBuffer_[pos + 1] == '\n') {
                pos += 1;
            }
            readLineBuffer_ = readLineBuffer_.substr(pos + 1);
            maxLenReached = false;
            eofReached = false;
            return ret;
        }

        const size_t prevSize = readLineBuffer_.size();
        if (maxLen <= prevSize) {
            std::string ret(readLineBuffer_.substr(0, maxLen));
            readLineBuffer_ = readLineBuffer_.substr(maxLen);
            maxLenReached = true;
            eofReached = false;
            return ret;
        }

        if (eofReadLine_) {
            std::string ret = readLineBuffer_;
            readLineBuffer_.clear();
            maxLenReached = false;
            eofReached = ret.empty();
            return ret;
        }

        readLineBuffer_.resize(maxLen);
        const size_t nRead =
            read(&readLineBuffer_[prevSize], maxLen - prevSize);
        if (nRead < maxLen - prevSize)
            eofReadLine_ = true;
        readLineBuffer_.resize(prevSize + nRead);
    }
}

// ---------------------------------------------------------------------------