Function PrintCharAndCodeTo

src/gtest/gtest-all.cpp:8765–8788

// UnsignedChar is the unsigned version of Char, which is the type of c.
template <typename UnsignedChar, typename Char>
void PrintCharAndCodeTo(Char c, ostream* os) {
  // First, print c as a literal in the most readable form we can find.
  *os << ((sizeof(c) > 1) ? "L'" : "'");
  const CharFormat format = PrintAsCharLiteralTo<UnsignedChar>(c, os);
  *os << "'";

  // To aid user debugging, we also print c's code in decimal, unless
  // it's 0 (in which case c was printed as '\\0', making the code
  // obvious).
  if (c == 0)
    return;
  *os << " (" << String::Format("%d", c).c_str();

  // For more convenience, we print c's code again in hexidecimal,
  // unless c was already printed in the form '\x##' or the code is in
  // [1, 9].
  if (format == kHexEscape || (1 <= c && c <= 9)) {
    // Do nothing.
  } else {
    *os << String::Format(", 0x%X",
                          static_cast<UnsignedChar>(c)).c_str();
  }
  *os << ")";
}

void PrintTo(unsigned char c, ::std::ostream* os) {
  PrintCharAndCodeTo<unsigned char>(c, os);