+/**
+ * Converts an EBCDIC invariant character to lowercase ASCII.
+ * @internal
+ */
+U_INTERNAL char U_EXPORT2
+uprv_ebcdicToLowercaseAscii(char c);
+
+/**
+ * \def uprv_invCharToLowercaseAscii
+ * Converts an invariant character to lowercase ASCII.
+ * @internal
+ */
+#if U_CHARSET_FAMILY==U_ASCII_FAMILY
+# define uprv_invCharToLowercaseAscii uprv_asciitolower
+#elif U_CHARSET_FAMILY==U_EBCDIC_FAMILY
+# define uprv_invCharToLowercaseAscii uprv_ebcdicToLowercaseAscii
+#else
+# error Unknown charset family!
+#endif
+