384 lines
10 KiB
Prolog
384 lines
10 KiB
Prolog
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: system.yap *
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* Last rev: *
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* mods: *
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* comments: Operating System Access built-ins *
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* *
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*************************************************************************/
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:- module(operating_system_support, [
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datime/1,
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delete_file/1,
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delete_file/2,
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directory_files/2,
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environ/2,
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exec/3,
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file_exists/1,
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file_exists/2,
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file_property/2,
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host_id/1,
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host_name/1,
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pid/1,
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kill/2,
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mktemp/2,
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make_directory/1,
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popen/3,
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rename_file/2,
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shell/0,
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shell/1,
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shell/2,
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sleep/1,
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system/0,
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system/1,
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system/2,
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mktime/2,
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tmpnam/1,
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tmp_file/2,
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tmpdir/1,
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wait/2,
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working_directory/2
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]).
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:- use_module(library(lists), [append/3]).
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:- load_foreign_files([sys], [], init_sys).
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:- dynamic tmp_file_sequence_counter/1.
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% time builtins
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datime(X) :-
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datime(X, Error),
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handle_system_error(Error, off, datime(X)).
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mktime(V, A) :- var(V), !,
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throw(error(instantiation_error,mktime(V,A))).
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mktime(In,Out) :-
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check_mktime_inp(In, mktime(In,Out)),
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In = datime(Y,Mo,D,H,Mi,S),
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mktime(Y, Mo, D, H, Mi, S, Out, Error),
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handle_system_error(Error, off, mktime(In,Out)).
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check_mktime_inp(V, Inp) :- var(V), !,
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throw(error(instantiation_error,Inp)).
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check_mktime_inp(datime(Y,Mo,D,H,Mi,S), Inp) :- !,
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check_int(Y, Inp),
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check_int(Mo, Inp),
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check_int(D, Inp),
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check_int(H, Inp),
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check_int(Mi, Inp),
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check_int(S, Inp).
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check_mktime_inp(T, Inp) :-
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throw(error(domain_error(mktime,T),Inp)).
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check_int(I, _) :- integer(I), !.
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check_int(I, Inp) :- var(I),
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throw(error(instantiation_error,Inp)).
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check_int(I, Inp) :-
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throw(error(type_error(integer,I),Inp)).
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% file operations
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handle_system_error(Error, _Ignore, _G) :- var(Error), !.
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handle_system_error(Error, off, G) :- atom(Error), !,
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throw(error(system_error(Error),G)).
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handle_system_error(Error, off, G) :-
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error_message(Error, Message),
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throw(error(system_error(Message),G)).
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file_property(IFile, type(Type)) :-
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true_file_name(IFile, File),
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file_property(File, Type, _Size, _Date, _Permissions, _LinkName).
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file_property(IFile, size(Size)) :-
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true_file_name(IFile, File),
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file_property(File, _Type, Size, _Date, _Permissions, _LinkName).
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file_property(IFile, mod_time(Date)) :-
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true_file_name(IFile, File),
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file_property(File, _Type, _Size, Date, _Permissions, _LinkName).
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file_property(IFile, mode(Permissions)) :-
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true_file_name(IFile, File),
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file_property(File, _Type, _Size, _Date, Permissions, _LinkName).
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file_property(IFile, linkto(LinkName)) :-
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true_file_name(IFile, File),
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file_property(File, _Type, _Size, _Date, _Permissions, LinkName),
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atom(LinkName).
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file_property(File, Type, Size, Date, Permissions, LinkName) :-
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file_property(File, Type, Size, Date, Permissions, LinkName, Error),
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handle_system_error(Error, off, file_property(File)).
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file_exists(File) :-
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var(File), !,
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throw(error(instantiation_error,file_exists(File))).
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file_exists(File) :-
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\+ atom(File), !,
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throw(error(type_error(atom,File),file_exists(File))).
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file_exists(IFile) :-
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true_file_name(IFile, File),
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file_property(File, _Type, _Size, _Date, _Permissions, _, Error),
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var(Error).
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file_exists(File, Permissions) :-
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var(File), !,
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throw(error(instantiation_error,file_exists(File, Permissions))).
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file_exists(File, Permissions) :-
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\+ atom(File), !,
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throw(error(type_error(atom,File),file_exists(File, Permissions))).
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file_exists(IFile, Permissions) :-
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true_file_name(IFile, File),
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file_property(File, _Type, _Size, _Date, FPermissions, _, Error),
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var(Error),
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process_permissions(Permissions, Perms),
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FPermissions /\ Perms =:= Perms.
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process_permissions(Number, Number) :- integer(Number).
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%
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% environment manipulation.
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%
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environ(Na,Val) :- var(Na), !,
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environ_enum(0,I),
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( p_environ(I,S) -> environ_split(S,SNa,SVal) ; !, fail ),
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atom_codes(Na, SNa),
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atom_codes(Val, SVal).
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environ(Na,Val) :- atom(Na), !,
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bound_environ(Na, Val).
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environ(Na,Val) :-
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throw(error(type_error(atom,Na),environ(Na,Val))).
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bound_environ(Na, Val) :- var(Val), !,
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getenv(Na,Val).
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bound_environ(Na, Val) :- atom(Val), !,
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putenv(Na,Val).
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bound_environ(Na, Val) :-
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throw(error(type_error(atom,Val),environ(Na,Val))).
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environ_enum(X,X).
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environ_enum(X,X1) :-
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Xi is X+1,
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environ_enum(Xi,X1).
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environ_split([61|SVal], [], SVal) :- !.
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environ_split([C|S],[C|SNa],SVal) :-
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environ_split(S,SNa,SVal).
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%
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% process execution
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%
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exec(Command, [StdIn, StdOut, StdErr], PID) :-
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G = exec(Command, [StdIn, StdOut, StdErr], PID),
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check_command_with_default_shell(Command, TrueCommand, G),
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process_inp_stream_for_exec(StdIn, In, G, [], L1),
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process_out_stream_for_exec(StdOut, Out, G, L1, L2),
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process_err_stream_for_exec(StdErr, Err, G, L2, L3),
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( exec_command(TrueCommand, In, Out, Err, PID, Error) -> true ; true ),
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close_temp_streams(L3),
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handle_system_error(Error, off, G).
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process_inp_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
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close_temp_streams(L),
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throw(error(instantiation_error,G)).
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process_inp_stream_for_exec(null, null, _, L, L) :- !.
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process_inp_stream_for_exec(std, 0, _, L, L) :- !.
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process_inp_stream_for_exec(pipe(ForWriting), ForReading, _, L, [ForReading|L]) :- var(ForWriting), !,
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open_pipe_streams(ForReading, ForWriting).
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process_inp_stream_for_exec(pipe(Stream), _, _, L, L) :- !,
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stream_property(Stream, output).
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process_inp_stream_for_exec(Stream, Stream, _, L, L) :-
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stream_property(Stream, output).
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process_out_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
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close_temp_streams(L),
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throw(error(instantiation_error,G)).
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process_out_stream_for_exec(null, null, _, L, L) :- !.
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process_out_stream_for_exec(std, 1, _, L, L) :- !.
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process_out_stream_for_exec(pipe(ForReading), ForWriting, _, L, [ForWriting|L]) :- var(ForReading), !,
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open_pipe_streams(ForReading, ForWriting).
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process_out_stream_for_exec(pipe(Stream), _, _, L, L) :- !,
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stream_property(Stream, input).
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process_out_stream_for_exec(Stream, Stream, _, L, L) :-
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stream_property(Stream, input).
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process_err_stream_for_exec(Error, _, G, L, L) :- var(Error), !,
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close_temp_streams(L),
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throw(error(instantiation_error,G)).
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process_err_stream_for_exec(null, null, _, L, L) :- !.
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process_err_stream_for_exec(std, 2, _, L, L) :- !.
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process_err_stream_for_exec(pipe(ForReading), ForWriting, _, L, [ForWriting|L]) :- var(ForReading), !,
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open_pipe_streams(ForReading, ForWriting).
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process_err_stream_for_exec(pipe(Stream), Stream, _, L, L) :- !,
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stream_property(Stream, input).
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process_err_stream_for_exec(Stream, Stream, _, L, L) :-
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stream_property(Stream, input).
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close_temp_streams([]).
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close_temp_streams([S|Ss]) :- close(S),
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close_temp_streams(Ss).
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popen(Command, Mode, Stream) :-
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open(pipe(Command), Mode, Stream).
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check_command_with_default_shell(Com, ComF, G) :-
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check_command(Com, G),
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os_command_postprocess(Com, ComF).
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%
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% make sure that Windows executes the command from $COMSPEC.
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%
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os_command_postprocess(Com, ComF) :- win, !,
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atom_codes(Com, SC),
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append(" /c ", SC, SC1),
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getenv('COMSPEC', Shell0),
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atom_codes(Shell0, Codes),
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append(Codes, SC1, SCF),
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atom_codes(ComF, SCF).
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os_command_postprocess(Com, Com).
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check_command(Com, G) :- var(Com), !,
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throw(error(instantiation_error,G)).
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check_command(Com, _) :- atom(Com), !.
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check_command(Com, G) :-
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throw(error(type_error(atom,Com),G)).
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check_mode(Mode, _, G) :- var(Mode), !,
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throw(error(instantiation_error,G)).
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check_mode(read, 0, _) :- !.
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check_mode(write,1, _) :- !.
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check_mode(Mode, G) :-
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throw(error(domain_error(io_mode,Mode),G)).
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shell :-
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G = shell,
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get_shell0(FullCommand),
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exec_command(FullCommand, 0, 1, 2, PID, Error),
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handle_system_error(Error, off, G),
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wait(PID, _Status, Error),
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handle_system_error(Error, off, G).
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shell(Command) :-
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G = shell(Command),
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check_command(Command, G),
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get_shell(Shell,Opt),
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do_shell(Shell, Opt, Command, Status, Error),
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Status = 0,
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handle_system_error(Error, off, G).
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shell(Command, Status) :-
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G = shell(Command, Status),
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check_command(Command, G),
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get_shell(Shell,Opt),
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do_shell(Shell, Opt, Command, Status, Error),
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handle_system_error(Error, off, G).
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protect_command([], [0'"]). % "
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protect_command([H|L], [H|NL]) :-
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protect_command(L, NL).
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get_shell0(Shell) :-
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getenv('SHELL', Shell), !.
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get_shell0(Shell) :-
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win, !,
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getenv('COMSPEC', Shell).
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get_shell0('/bin/sh').
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get_shell(Shell, '-c') :-
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getenv('SHELL', Shell), !.
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get_shell(Shell, '/c') :-
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win, !,
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getenv('COMSPEC', Shell).
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get_shell('/bin/sh','-c').
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system :-
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default_shell(Command),
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do_system(Command, _Status, Error),
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handle_system_error(Error, off, system).
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default_shell(Shell) :- win, !,
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getenv('COMSPEC', Shell).
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default_shell('/bin/sh').
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system(Command, Status) :-
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G = system(Command, Status),
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check_command(Command, G),
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do_system(Command, Status, Error),
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Status = 0,
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handle_system_error(Error, off, G).
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wait(PID,STATUS) :- var(PID), !,
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throw(error(instantiation_error,wait(PID,STATUS))).
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wait(PID,STATUS) :- integer(PID), !,
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wait(PID, STATUS, Error),
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handle_system_error(Error, off, wait(PID,STATUS)).
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wait(PID,STATUS) :-
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throw(error(type_error(integer,PID),wait(PID,STATUS))).
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%
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% host info
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%
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host_name(X) :-
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host_name(X, Error),
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handle_system_error(Error, off, host_name(X)).
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host_id(X) :-
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host_id(X0, Error),
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handle_system_error(Error, off, host_id(X)),
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number_codes(X0, S),
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atom_codes(X, S).
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pid(X) :-
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pid(X, Error),
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handle_system_error(Error, off, pid(X)).
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kill(X,Y) :-
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integer(X), integer(Y), !,
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kill(X, Y, Error),
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handle_system_error(Error, off, kill(X,Y)).
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kill(X,Y) :- (var(X) ; var(Y)), !,
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throw(error(instantiation_error,kill(X,Y))).
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kill(X,Y) :- integer(X), !,
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throw(error(type_error(integer,Y),kill(X,Y))).
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kill(X,Y) :-
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throw(error(type_error(integer,X),kill(X,Y))).
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mktemp(X,Y) :- var(X), !,
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throw(error(instantiation_error,mktemp(X,Y))).
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mktemp(X,Y) :-
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atom(X), !,
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mktemp(X, Y, Error),
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handle_system_error(Error, off, mktemp(X,Y)).
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mktemp(X,Y) :-
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throw(error(type_error(atom,X),mktemp(X,Y))).
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tmpnam(X) :-
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tmpnam(X, Error),
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handle_system_error(Error, off, tmpnam(X)).
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%%% Added from Theo, path_seperator is used to replace the c predicate dir_separator which is not OS aware
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tmpdir(TmpDir):-
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tmpdir(Dir, Error),
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handle_system_error(Error, off, tmpdir(Dir)),
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path_separator(D),
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(atom_concat(_, D, Dir) ->
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TmpDir = Dir
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;
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atom_concat(Dir, D, TmpDir)
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).
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path_separator('\\'):-
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win, !.
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path_separator('/').
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