Function fixUTF8

ext/src/llvm/JSON.cpp:546–561

}

std::string fixUTF8(llvm::StringRef S) {
  // This isn't particularly efficient, but is only for error-recovery.
  std::vector<UTF32> Codepoints(S.size()); // 1 codepoint per byte suffices.
  const UTF8 *In8 = reinterpret_cast<const UTF8 *>(S.data());
  UTF32 *Out32 = Codepoints.data();
  ConvertUTF8toUTF32(&In8, In8 + S.size(), &Out32, Out32 + Codepoints.size(),
                     lenientConversion);
  Codepoints.resize(Out32 - Codepoints.data());
  std::string Res(4 * Codepoints.size(), 0); // 4 bytes per codepoint suffice
  const UTF32 *In32 = Codepoints.data();
  UTF8 *Out8 = reinterpret_cast<UTF8 *>(&Res[0]);
  ConvertUTF32toUTF8(&In32, In32 + Codepoints.size(), &Out8, Out8 + Res.size(),
                     strictConversion);
  Res.resize(reinterpret_cast<char *>(Out8) - Res.data());
  return Res;
}

static void quote(llvm::raw_ostream &OS, llvm::StringRef S) {
  OS << '\"';