* c-lex.c (read_escape, read_ucs): Delete.
	(lex_string): Use cpp_parse_escape.
	* cpplex.c (read_ucs): Rename maybe_read_ucs.  Do nothing
	if not C++ or not C99.  Warn if traditional.
	(parse_escape): Rename cpp_parse_escape.  Make the bitmask
	unsigned.  Warn for out-of-range escape sequences here.
	Update to use maybe_read_ucs.
	(cpp_interpret_charconst):  Don't warn here.
	* cpplib.h (cpp_parse_escape): New exported function.

From-SVN: r42509