All host names with nonascii characters (cyrillic) + escapable characters (,)...

googleurl/src/url_canon_internal.h

 // Copyright 2007, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
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 // Returns the canonicalized version of the input character according to scheme
 // rules. This is implemented alongside the scheme canonicalizer, and is
 // required for relative URL resolving to test for scheme equality.
 //
 // Returns 0 if the input character is not a valid scheme character.
 char CanonicalSchemeChar(char16 ch);
 
 // Write a single character, escaped, to the output. This always escapes: it
 // does no checking that thee character requires escaping.
-inline void AppendEscapedChar(unsigned char ch,
-                              CanonOutput* output) {
+// Escaping makes sense only 8 bit chars, so code works in all cases of
+// input parameters (8/16bit).
+template<typename UINCHAR, typename OUTCHAR>
+inline void AppendEscapedChar(UINCHAR ch,
+                              CanonOutputT<OUTCHAR>* output) {
   output->push_back('%');
   output->push_back(kHexCharLookup[ch >> 4]);
   output->push_back(kHexCharLookup[ch & 0xf]);
 }
 
 // The character we'll substitute for undecodable or invalid characters.
 extern const char16 kUnicodeReplacementCharacter;
 
 // UTF-8 functions ------------------------------------------------------------
 
@@ skipping 291 matching lines @@
 inline unsigned long long _strtoui64(const char* nptr,
                                      char** endptr, int base) {
   return strtoull(nptr, endptr, base);
 }
 
 #endif  // WIN32
 
 }  // namespace url_canon
 
 #endif  // GOOGLEURL_SRC_URL_CANON_INTERNAL_H__