1997-10-03 Mikael Djurfeldt <mdj@nada.kth.se>

1997-10-03  Mikael Djurfeldt  <mdj@nada.kth.se>

	* print.h (SCM_PRINT_STATE_P): Removed SCM_NIMP test.  (NIMP
	macros should by convention not test for NIMPness.)
	(SCM_COERCE_OPORT): Adjust indentation.

	* print.c (scm_valid_oport_value_p): Adjusted indentation; Added
	SCM_NIMP test before SCM_PRINT_STATE_P.

	* struct.c, struct.h, gc.c: Renamed:
	scm_struct_i_layout	   --> scm_vtable_index_layout
	scm_struct_i_vcell	   --> scm_vtable_index_vcell
	scm_struct_i_vtable	   --> scm_vtable_index_vtable
	scm_struct_i_printer	   --> scm_vtable_index_printer
	scm_struct_i_vtable_offset --> scm_vtable_offset_user

	* struct.c (scm_print_struct): Use new printer slot; Default
	printing: Also output hex code of vtable so that type identity
	will be indicated as well.
	(scm_init_struct): Updated required_vtable_fields to "pruosrpw";
	Removed struct_printer_var; Removed struct-vtable-offset;
	(vtable-index-layout, vtable-index-vtable, vtable-index-printer,
	vtable-offset-user): New constants.

	* struct.h (scm_struct_i_vtable_offset): Bumped from 3 to 4.
	(scm_struct_i_printer, SCM_STRUCT_PRINTER): New slot in vtables.
  	If this slot contains a procedure, use that to print structures of
 	the type represented by this vtable.

	* print.c (scm_iprin1): Don't print arguments of macro
 	transformers.  (They are always: exp env.); Bugfix: Unmemoize
 	transformer source with correct environment.