/usr/share/Yap/pl/load_foreign.yap is in yap 5.1.3-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
* *
**************************************************************************
* *
* File: load_foreign.yap *
* Last rev: 8/2/88 *
* mods: *
* comments: Utility predicates for load_foreign *
* *
*************************************************************************/
load_foreign_files(Objs,Libs,Entry) :-
'$check_objs_for_load_foreign_files'(Objs,NewObjs,load_foreign_files(Objs,Libs,Entry)),
'$check_libs_for_load_foreign_files'(Libs,NewLibs,load_foreign_files(Objs,Libs,Entry)),
'$check_entry_for_load_foreign_files'(Entry,load_foreign_files(Objs,Libs,Entry)),
'$load_foreign_files'(NewObjs,NewLibs,Entry).
'$check_objs_for_load_foreign_files'(V,_,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_objs_for_load_foreign_files'([],[],_) :- !.
'$check_objs_for_load_foreign_files'([Obj|Objs],[NObj|NewObjs],G) :- !,
'$check_obj_for_load_foreign_files'(Obj,NObj,G),
'$check_objs_for_load_foreign_files'(Objs,NewObjs,G).
'$check_objs_for_load_foreign_files'(Objs,_,G) :-
'$do_error'(type_error(list,Objs),G).
'$check_obj_for_load_foreign_files'(V,_,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_obj_for_load_foreign_files'(Obj,NewObj,_) :- atom(Obj), !,
atom_codes(Obj,ObjCodes),
'$process_obj_suffix'(ObjCodes,NewObjCodes),
atom_codes(NewObj,NewObjCodes).
'$check_obj_for_load_foreign_files'(Obj,_,G) :-
'$do_error'(type_error(atom,Obj),G).
'$check_libs_for_load_foreign_files'(V,_,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_libs_for_load_foreign_files'([],[],_) :- !.
'$check_libs_for_load_foreign_files'([Lib|Libs],[NLib|NLibs],G) :- !,
'$check_lib_for_load_foreign_files'(Lib,NLib,G),
'$check_libs_for_load_foreign_files'(Libs,NLibs,G).
'$check_libs_for_load_foreign_files'(Libs,_,G) :-
'$do_error'(type_error(list,Libs),G).
'$check_lib_for_load_foreign_files'(V,_,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_lib_for_load_foreign_files'(Lib,NLib,_) :- atom(Lib), !,
atom_codes(Lib,LibCodes),
'$process_obj_suffix'(LibCodes,NewLibCodes),
'$checklib_prefix'(NewLibCodes,FullLibCodes),
atom_codes(NLib,FullLibCodes).
'$check_lib_for_load_foreign_files'(Lib,_,G) :-
'$do_error'(type_error(atom,Lib),G).
'$process_obj_suffix'(ObjCodes,ObjCodes) :-
'$obj_suffix'(ObjSuffix),
lists:append(_,ObjSuffix,ObjCodes), !.
'$process_obj_suffix'(ObjCodes,NewObjCodes) :-
'$obj_suffix'(ObjSuffix),
lists:append(ObjCodes,ObjSuffix,NewObjCodes).
'$checklib_prefix'(Cs,Cs) :- '$rooted_path'(Cs), !.
'$checklib_prefix'([0'l,0'i,0'b|NewObjCodes],[0'l,0'i,0'b|NewObjCodes]) :- !.
'$checklib_prefix'(NewObjCodes,[0'l,0'i,0'b|NewObjCodes]).
'$rooted_path'([C|_]) :- '$dir_separator'(C), !.
'$rooted_path'(Cs) :-
% win32 machine
'$dir_separator'(0'\\),
'$get_drive'(Cs).
'$get_drive'([0':|_]) :- !.
'$get_drive'([0'\\|_]) :- !, fail.
'$get_drive'([_|L]) :-
'$get_drive'(L).
'$check_entry_for_load_foreign_files'(V,G) :- var(V), !,
'$do_error'(instantiation_error,G).
'$check_entry_for_load_foreign_files'(Entry,_) :- atom(Entry), !.
'$check_entry_for_load_foreign_files'(Entry,G) :-
'$do_error'(type_error(atom,Entry),G).
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