void set_encoding_stream_coding_system (Lstream *stream,
Lisp_Object codesys);
void determine_real_coding_system (Lstream *stream, Lisp_Object *codesys_in_out,
void set_encoding_stream_coding_system (Lstream *stream,
Lisp_Object codesys);
void determine_real_coding_system (Lstream *stream, Lisp_Object *codesys_in_out,