Method WaitForLine

Source/cmSystemTools.cxx:2780–2900

}

cmSystemTools::WaitForLineResult cmSystemTools::WaitForLine(
  uv_loop_t* loop, uv_stream_t* outPipe, uv_stream_t* errPipe,
  std::string& line, std::vector<char>& out, std::vector<char>& err)
{
  line.clear();
  auto outiter = out.begin();
  auto erriter = err.begin();
  cmProcessOutput processOutput;
  std::string strdata;
  while (true) {
    // Check for a newline in stdout.
    for (; outiter != out.end(); ++outiter) {
      if ((*outiter == '\r') && ((outiter + 1) == out.end())) {
        break;
      }
      if (*outiter == '\n' || *outiter == '\0') {
        std::vector<char>::size_type length = outiter - out.begin();
        if (length > 1 && *(outiter - 1) == '\r') {
          --length;
        }
        if (length > 0) {
          line.append(out.data(), length);
        }
        out.erase(out.begin(), outiter + 1);
        return WaitForLineResult::STDOUT;
      }
    }

    // Check for a newline in stderr.
    for (; erriter != err.end(); ++erriter) {
      if ((*erriter == '\r') && ((erriter + 1) == err.end())) {
        break;
      }
      if (*erriter == '\n' || *erriter == '\0') {
        std::vector<char>::size_type length = erriter - err.begin();
        if (length > 1 && *(erriter - 1) == '\r') {
          --length;
        }
        if (length > 0) {
          line.append(err.data(), length);
        }
        err.erase(err.begin(), erriter + 1);
        return WaitForLineResult::STDERR;
      }
    }

    // No newlines found.  Wait for more data from the process.
    struct ReadData
    {
      uv_stream_t* Stream;
      std::vector<char> Buffer;
      bool Read = false;
      bool Finished = false;
    };
    auto startRead =
      [](uv_stream_t* stream,
         ReadData& data) -> std::unique_ptr<cmUVStreamReadHandle> {
      data.Stream = stream;