Canonicalize IPv6 addresses.

src/url_canon_internal.cc

 // 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
@@ skipping 368 matching lines @@
   if (repl_source.path)     source->path = utf8_buffer->data();
   if (repl_source.query)    source->query = utf8_buffer->data();
   if (repl_source.ref)      source->ref = utf8_buffer->data();
 
   return success;
 }
 
 #ifndef WIN32
 
 int _itoa_s(int value, char* buffer, size_t size_in_chars, int radix) {
-  if (radix != 10)
+  const char* format_str;
+  if (radix == 10)
+    format_str = "%d";
+  else if (radix == 16)
+    format_str = "%x";
+  else
     return EINVAL;
 
-  int written = snprintf(buffer, size_in_chars, "%d", value);
+  int written = snprintf(buffer, size_in_chars, format_str, value);
   if (static_cast<size_t>(written) >= size_in_chars) {
     // Output was truncated, or written was negative.
     return EINVAL;
   }
   return 0;
 }
 
 int _itow_s(int value, char16* buffer, size_t size_in_chars, int radix) {
   if (radix != 10)
     return EINVAL;
@@ skipping 10 matching lines @@
   for (int i = 0; i < written; ++i) {
     buffer[i] = static_cast<char16>(temp[i]);
   }
   buffer[written] = '\0';
   return 0;
 }
 
 #endif  // !WIN32
 
 }  // namespace url_canon