Function PrepareForUTF8Output

src/butil/strings/utf_string_conversion_utils.cc:108–121

template<typename CHAR>
void PrepareForUTF8Output(const CHAR* src,
                          size_t src_len,
                          std::string* output) {
  output->clear();
  if (src_len == 0)
    return;
  if (src[0] < 0x80) {
    // Assume that the entire input will be ASCII.
    output->reserve(src_len);
  } else {
    // Assume that the entire input is non-ASCII and will have 3 bytes per char.
    output->reserve(src_len * 3);
  }
}

// Instantiate versions we know callers will need.
template void PrepareForUTF8Output(const wchar_t*, size_t, std::string*);