Method readToString

src/util/file.cc:162–185

}

int64 File::readToString(std::string* const output, uint64 max_length) {
  CHECK_NOTNULL(output);
  output->clear();

  if (max_length == 0) return 0;
 // if (max_length < 0) return -1;

  int64 needed = max_length;
  int bufsize = (needed < (2 << 20) ? needed : (2 << 20));

  std::unique_ptr<char[]> buf(new char[bufsize]);

  int64 nread = 0;
  while (needed > 0) {
    nread = read(buf.get(), (bufsize < needed ? bufsize : needed));
    if (nread > 0) {
      output->append(buf.get(), nread);
      needed -= nread;
    } else {
      break;
    }
  }
  return (nread >= 0 ? static_cast<int64>(output->size()) : -1);
}

size_t File::writeString(const std::string& line) {
  return write(line.c_str(), line.size());