Method CaseInsensitiveWideCStringEquals

src/gtest/gtest-all.cpp:2919–2939

Compares two wide C strings, ignoring case. Returns true iff they have the same content. Unlike wcscasecmp(), this function can handle NULL argument(s). A NULL C string is considered different to any non-NULL wide C string, including the empty string. NB: The implementations on different platforms slightly differ. On windows, this method uses _wcsicmp which compares according to LC_CTYPE environ

  // On MacOS X, it uses towlower, which also uses LC_CTYPE category of the
  // current locale.
bool String::CaseInsensitiveWideCStringEquals(const wchar_t* lhs,
                                              const wchar_t* rhs) {
  if (lhs == NULL) return rhs == NULL;

  if (rhs == NULL) return false;

#if GTEST_OS_WINDOWS
  return _wcsicmp(lhs, rhs) == 0;
#elif GTEST_OS_LINUX && !GTEST_OS_LINUX_ANDROID
  return wcscasecmp(lhs, rhs) == 0;
#else
  // Android, Mac OS X and Cygwin don't define wcscasecmp.
  // Other unknown OSes may not define it either.
  wint_t left, right;
  do {
    left = towlower(*lhs++);
    right = towlower(*rhs++);
  } while (left && left == right);
  return left == right;
#endif  // OS selector
}

// Compares this with another String.
// Returns < 0 if this is less than rhs, 0 if this is equal to rhs, or > 0