Implement PEP 393.
diff --git a/Objects/stringlib/ucs2lib.h b/Objects/stringlib/ucs2lib.h
new file mode 100644
index 0000000..1bb9c27
--- /dev/null
+++ b/Objects/stringlib/ucs2lib.h
@@ -0,0 +1,34 @@
+/* this is sort of a hack. there's at least one place (formatting
+ floats) where some stringlib code takes a different path if it's
+ compiled as unicode. */
+#define STRINGLIB_IS_UNICODE 1
+
+#define FASTSEARCH ucs2lib_fastsearch
+#define STRINGLIB(F) ucs2lib_##F
+#define STRINGLIB_OBJECT PyUnicodeObject
+#define STRINGLIB_CHAR Py_UCS2
+#define STRINGLIB_TYPE_NAME "unicode"
+#define STRINGLIB_PARSE_CODE "U"
+#define STRINGLIB_EMPTY unicode_empty
+#define STRINGLIB_ISSPACE Py_UNICODE_ISSPACE
+#define STRINGLIB_ISLINEBREAK BLOOM_LINEBREAK
+#define STRINGLIB_ISDECIMAL Py_UNICODE_ISDECIMAL
+#define STRINGLIB_TODECIMAL Py_UNICODE_TODECIMAL
+#define STRINGLIB_TOUPPER Py_UNICODE_TOUPPER
+#define STRINGLIB_TOLOWER Py_UNICODE_TOLOWER
+#define STRINGLIB_FILL Py_UNICODE_FILL
+#define STRINGLIB_STR PyUnicode_1BYTE_DATA
+#define STRINGLIB_LEN PyUnicode_GET_LENGTH
+#define STRINGLIB_NEW PyUnicode_FromUCS2
+#define STRINGLIB_RESIZE not_supported
+#define STRINGLIB_CHECK PyUnicode_Check
+#define STRINGLIB_CHECK_EXACT PyUnicode_CheckExact
+#define STRINGLIB_GROUPING _PyUnicode_InsertThousandsGrouping
+#define STRINGLIB_GROUPING_LOCALE _PyUnicode_InsertThousandsGroupingLocale
+
+#define STRINGLIB_TOSTR PyObject_Str
+#define STRINGLIB_TOASCII PyObject_ASCII
+
+#define _Py_InsertThousandsGrouping _PyUnicode_ucs2_InsertThousandsGrouping
+#define _Py_InsertThousandsGroupingLocale _PyUnicode_ucs2_InsertThousandsGroupingLocale
+