The prev version cannot support %s.  So make a new version to support it.

And I think current way to handle printf is too much hack way.  Maybe
I need find out a more better way to handle the printf.

Thanks,
Hui

2011-02-04  Hui Zhu  <teawater@gmail.com>

	* ax-gdb.c (gen_printf_expr_callback): New function.
	* ax-general.c (ax_memcpy): New function.
	(aop_map): Add new entry for "printf".
	(ax_print): Handle "printf".
	(ax_reqs): Ditto.
	* ax.h (agent_op): Add aop_printf.
	(ax_memcpy): Forward declare.
	* printcmd.c (printf_callback): New typedef.
	(string_printf): New function from ui_printf.
	(ui_printf): Call string_printf.
	(printf_command): Remove static.
	* tracepoint.c (printf_command, gen_printf_expr_callback,
	printf_callback, string_printf): Forward declares.
	(validate_actionline, encode_actions_1): handle printf_command.