Function valueToQuotedStringN

Utilities/cmjsoncpp/src/lib_json/json_writer.cpp:276–351

}

static String valueToQuotedStringN(const char* value, size_t length,
                                   bool emitUTF8 = false) {
  if (value == nullptr)
    return "";

  if (!doesAnyCharRequireEscaping(value, length))
    return String("\"") + value + "\"";
  // We have to walk value and escape any special characters.
  // Appending to String is not efficient, but this should be rare.
  // (Note: forward slashes are *not* rare, but I am not escaping them.)
  String::size_type maxsize = length * 2 + 3; // allescaped+quotes+NULL
  String result;
  result.reserve(maxsize); // to avoid lots of mallocs
  result += "\"";
  char const* end = value + length;
  for (const char* c = value; c != end; ++c) {
    switch (*c) {
    case '\"':
      result += "\\\"";
      break;
    case '\\':
      result += "\\\\";
      break;
    case '\b':
      result += "\\b";
      break;
    case '\f':
      result += "\\f";
      break;
    case '\n':
      result += "\\n";
      break;
    case '\r':
      result += "\\r";
      break;
    case '\t':
      result += "\\t";
      break;
    // case '/':
    // Even though \/ is considered a legal escape in JSON, a bare
    // slash is also legal, so I see no reason to escape it.
    // (I hope I am not misunderstanding something.)
    // blep notes: actually escaping \/ may be useful in javascript to avoid </
    // sequence.
    // Should add a flag to allow this compatibility mode and prevent this
    // sequence from occurring.
    default: {
      if (emitUTF8) {
        unsigned codepoint = static_cast<unsigned char>(*c);
        if (codepoint < 0x20) {
          appendHex(result, codepoint);
        } else {
          appendRaw(result, codepoint);
        }
      } else {
        unsigned codepoint = utf8ToCodepoint(c, end); // modifies `c`
        if (codepoint < 0x20) {
          appendHex(result, codepoint);