Function OutputUInt64AsString

src/common/base/string_number.cc:483–517

template <typename OutputIterator>
OutputIterator OutputUInt64AsString(uint64_t u64, OutputIterator output) {
  int digits;
  const char* ASCII_digits = NULL;

  uint32_t u = static_cast<uint32_t>(u64);
  if (u == u64) return OutputUInt32AsString(u, output);

  uint64_t top_11_digits = u64 / 1000000000;
  output = OutputUInt64AsString(top_11_digits, output);
  u = static_cast<uint32_t>(u64 - (top_11_digits * 1000000000));

  digits = u / 10000000;  // 10,000,000
  ASCII_digits = two_ASCII_digits[digits];
  *output++ = ASCII_digits[0];
  *output++ = ASCII_digits[1];
  u -= digits * 10000000;  // 10,000,000
  digits = u / 100000;     // 100,000
  ASCII_digits = two_ASCII_digits[digits];
  *output++ = ASCII_digits[0];
  *output++ = ASCII_digits[1];
  u -= digits * 100000;  // 100,000
  digits = u / 1000;     // 1,000
  ASCII_digits = two_ASCII_digits[digits];
  *output++ = ASCII_digits[0];
  *output++ = ASCII_digits[1];
  u -= digits * 1000;  // 1,000
  digits = u / 10;
  ASCII_digits = two_ASCII_digits[digits];
  *output++ = ASCII_digits[0];
  *output++ = ASCII_digits[1];
  u -= digits * 10;
  digits = u;
  *output++ = '0' + digits;
  return output;
}

template <typename OutputIterator>
OutputIterator OutputInt64AsString(int64_t i, OutputIterator output) {