%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1996-2010. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
%% This module is a library of useful i/o functions. It is hoped that the
%% functions defined in it are basic enough to be used without modification
%% as components of more complex utilities.
%%
%% It is completely self-contained and uses no other modules. Its own
%% utilities are exported.
%%
%% Most of the code here is derived from the original prolog versions and
%% from similar code written by Joe Armstrong and myself.
%%
%% This module has been split into seperate modules:
%% io_lib - basic write and utilities
%% io_lib_format - formatted output
%% io_lib_fread - formatted input
%% io_lib_pretty - term prettyprinter
%% For handling ISO 8859-1 (Latin-1) we use the following type
%% information:
%%
%% 000 - 037 NUL - US control
%% 040 - 057 SPC - / punctuation
%% 060 - 071 0 - 9 digit
%% 072 - 100 : - @ punctuation
%% 101 - 132 A - Z uppercase
%% 133 - 140 [ - ` punctuation
%% 141 - 172 a - z lowercase
%% 173 - 176 { - ~ punctuation
%% 177 DEL control
%% 200 - 237 control
%% 240 - 277 NBSP - � punctuation
%% 300 - 326 � - � uppercase
%% 327 � punctuation
%% 330 - 336 � - � uppercase
%% 337 - 366 � - � lowercase
%% 367 � punctuation
%% 370 - 377 � - � lowercase
%%
%% Many punctuation characters region have special meaning. Must
%% watch using � \327, very close to x \170
-module(io_lib).
-export([fwrite/2,fread/2,fread/3,format/2]).
-export([print/1,print/4,indentation/2]).
-export([write/1,write/2,write/3,nl/0,format_prompt/1]).
-export([write_atom/1,write_string/1,write_string/2,write_unicode_string/1,
write_unicode_string/2, write_char/1, write_unicode_char/1]).
-export([quote_atom/2, char_list/1, unicode_char_list/1,
deep_char_list/1, deep_unicode_char_list/1,
printable_list/1, printable_unicode_list/1]).
%% Utilities for collecting characters.
-export([collect_chars/3, collect_chars/4,
collect_line/2, collect_line/3, collect_line/4,
get_until/3, get_until/4]).
-export_type([chars/0]).
%%----------------------------------------------------------------------
%% XXX: overapproximates a deep list of (unicode) characters
-type chars() :: [_].
-type depth() :: -1 | non_neg_integer().
%%----------------------------------------------------------------------
%% Interface calls to sub-modules.
-spec fwrite(io:format(), [term()]) -> chars().
fwrite(Format, Args) ->
format(Format, Args).
-spec fread(string(), string()) -> io_lib_fread:fread_2_ret().
fread(Chars, Format) ->
io_lib_fread:fread(Chars, Format).
-spec fread(io_lib_fread:continuation(), string(), string()) ->
io_lib_fread:fread_3_ret().
fread(Cont, Chars, Format) ->
io_lib_fread:fread(Cont, Chars, Format).
-spec format(io:format(), [term()]) -> chars().
format(Format, Args) ->
case catch io_lib_format:fwrite(Format, Args) of
{'EXIT',_} ->
erlang:error(badarg, [Format, Args]);
Other ->
Other
end.
-spec print(term()) -> chars().
print(Term) ->
io_lib_pretty:print(Term).
-spec print(term(), non_neg_integer(), non_neg_integer(), depth()) -> chars().
print(Term, Column, LineLength, Depth) ->
io_lib_pretty:print(Term, Column, LineLength, Depth).
-spec indentation(string(), integer()) -> integer().
indentation(Chars, Current) ->
io_lib_format:indentation(Chars, Current).
%% Format an IO-request prompt (handles formatting errors safely).
%% Atoms, binaries, and iolists can be used as-is, and will be
%% printed without any additional quotes.
%% Note that the output is a deep string, and not an iolist (i.e.,
%% it may be deep, but never contains binaries, due to the "~s").
-spec format_prompt(term()) -> chars().
format_prompt({format,Format,Args}) ->
format_prompt(Format,Args);
format_prompt(Prompt)
when is_list(Prompt); is_atom(Prompt); is_binary(Prompt) ->
format_prompt("~ts", [Prompt]);
format_prompt(Prompt) ->
format_prompt("~tp", [Prompt]).
format_prompt(Format, Args) ->
case catch io_lib:format(Format, Args) of
{'EXIT',_} -> "???";
List -> List
end.
%% write(Term)
%% write(Term, Depth)
%% write(Term, Depth, Pretty)
%% Return a (non-flattened) list of characters giving a printed
%% representation of the term. write/3 is for backward compatibility.
-spec write(term()) -> chars().
write(Term) -> write(Term, -1).
-spec write(term(), depth(), boolean()) -> chars().
write(Term, D, true) ->
io_lib_pretty:print(Term, 1, 80, D);
write(Term, D, false) ->
write(Term, D).
-spec write(term(), depth()) -> chars().
write(_Term, 0) -> "...";
write(Term, _D) when is_integer(Term) -> integer_to_list(Term);
write(Term, _D) when is_float(Term) -> io_lib_format:fwrite_g(Term);
write(Atom, _D) when is_atom(Atom) -> write_atom(Atom);
write(Term, _D) when is_port(Term) -> write_port(Term);
write(Term, _D) when is_pid(Term) -> pid_to_list(Term);
write(Term, _D) when is_reference(Term) -> write_ref(Term);
write(<<_/bitstring>>=Term, D) -> write_binary(Term, D);
write([], _D) -> "[]";
write({}, _D) -> "{}";
write([H|T], D) ->
if
D =:= 1 -> "[...]";
true ->
[$[,[write(H, D-1)|write_tail(T, D-1, $|)],$]]
end;
write(F, _D) when is_function(F) ->
erlang:fun_to_list(F);
write(T, D) when is_tuple(T) ->
if
D =:= 1 -> "{...}";
true ->
[${,
[write(element(1, T), D-1)|
write_tail(tl(tuple_to_list(T)), D-1, $,)],
$}]
end.
%% write_tail(List, Depth, CharacterBeforeDots)
%% Test the terminating case first as this looks better with depth.
write_tail([], _D, _S) -> "";
write_tail(_, 1, S) -> [S | "..."];
write_tail([H|T], D, S) ->
[$,,write(H, D-1)|write_tail(T, D-1, S)];
write_tail(Other, D, S) ->
[S,write(Other, D-1)].
write_port(Port) ->
erlang:port_to_list(Port).
write_ref(Ref) ->
erlang:ref_to_list(Ref).
write_binary(B, D) when is_integer(D) ->
[$<,$<,write_binary_body(B, D),$>,$>].
write_binary_body(_B, 1) ->
"...";
write_binary_body(<<>>, _D) ->
"";
write_binary_body(<<X:8>>, _D) ->
[integer_to_list(X)];
write_binary_body(<<X:8,Rest/bitstring>>, D) ->
[integer_to_list(X),$,|write_binary_body(Rest, D-1)];
write_binary_body(B, _D) ->
L = bit_size(B),
<<X:L>> = B,
[integer_to_list(X),$:,integer_to_list(L)].
%% write_atom(Atom) -> [Char]
%% Generate the list of characters needed to print an atom.
-spec write_atom(atom()) -> chars().
write_atom(Atom) ->
Chars = atom_to_list(Atom),
case quote_atom(Atom, Chars) of
true ->
write_string(Chars, $'); %'
false ->
Chars
end.
%% quote_atom(Atom, CharList)
%% Return 'true' if atom with chars in CharList needs to be quoted, else
%% return 'false'.
-spec quote_atom(atom(), chars()) -> boolean().
quote_atom(Atom, Cs0) ->
case erl_scan:reserved_word(Atom) of
true -> true;
false ->
case Cs0 of
[C|Cs] when C >= $a, C =< $z ->
not name_chars(Cs);
[C|Cs] when C >= $�, C =< $�, C =/= $� ->
not name_chars(Cs);
_ -> true
end
end.
name_chars([C|Cs]) ->
case name_char(C) of
true -> name_chars(Cs);
false -> false
end;
name_chars([]) -> true.
name_char(C) when C >= $a, C =< $z -> true;
name_char(C) when C >= $�, C =< $�, C =/= $� -> true;
name_char(C) when C >= $A, C =< $Z -> true;
name_char(C) when C >= $�, C =< $�, C =/= $� -> true;
name_char(C) when C >= $0, C =< $9 -> true;
name_char($_) -> true;
name_char($@) -> true;
name_char(_) -> false.
%% write_string([Char]) -> [Char]
%% Generate the list of characters needed to print a string.
-spec write_string(string()) -> chars().
write_string(S) ->
write_string(S, $"). %"
-spec write_string(string(), char()) -> chars().
write_string(S, Q) ->
[Q|write_string1(latin1, S, Q)].
write_unicode_string(S) ->
write_unicode_string(S, $"). %"
write_unicode_string(S, Q) ->
[Q|write_string1(unicode, S, Q)].
write_string1(_,[], Q) ->
[Q];
write_string1(Enc,[C|Cs], Q) ->
string_char(Enc,C, Q, write_string1(Enc,Cs, Q)).
string_char(_,Q, Q, Tail) -> [$\\,Q|Tail]; %Must check these first!
string_char(_,$\\, _, Tail) -> [$\\,$\\|Tail];
string_char(_,C, _, Tail) when C >= $\s, C =< $~ ->
[C|Tail];
string_char(latin1,C, _, Tail) when C >= $\240, C =< $\377 ->
[C|Tail];
string_char(unicode,C, _, Tail) when C >= $\240 ->
"\\x{"++erlang:integer_to_list(C, 16)++"}"++Tail;
string_char(_,$\n, _, Tail) -> [$\\,$n|Tail]; %\n = LF
string_char(_,$\r, _, Tail) -> [$\\,$r|Tail]; %\r = CR
string_char(_,$\t, _, Tail) -> [$\\,$t|Tail]; %\t = TAB
string_char(_,$\v, _, Tail) -> [$\\,$v|Tail]; %\v = VT
string_char(_,$\b, _, Tail) -> [$\\,$b|Tail]; %\b = BS
string_char(_,$\f, _, Tail) -> [$\\,$f|Tail]; %\f = FF
string_char(_,$\e, _, Tail) -> [$\\,$e|Tail]; %\e = ESC
string_char(_,$\d, _, Tail) -> [$\\,$d|Tail]; %\d = DEL
string_char(_,C, _, Tail) when C < $\240-> %Other control characters.
C1 = (C bsr 6) + $0,
C2 = ((C bsr 3) band 7) + $0,
C3 = (C band 7) + $0,
[$\\,C1,C2,C3|Tail].
%% write_char(Char) -> [char()].
%% Generate the list of characters needed to print a character constant.
%% Must special case SPACE, $\s, here.
-spec write_char(char()) -> chars().
write_char($\s) -> "$\\s"; %Must special case this.
write_char(C) when is_integer(C), C >= $\000, C =< $\377 ->
[$$|string_char(latin1,C, -1, [])].
write_unicode_char(Ch) when Ch =< 255 ->
write_char(Ch);
write_unicode_char(Uni) ->
[$$|string_char(unicode,Uni, -1, [])].
%% char_list(CharList)
%% deep_char_list(CharList)
%% Return true if CharList is a (possibly deep) list of characters, else
%% false.
-spec char_list(term()) -> boolean().
char_list([C|Cs]) when is_integer(C), C >= $\000, C =< $\377 ->
char_list(Cs);
char_list([]) -> true;
char_list(_) -> false. %Everything else is false
-spec unicode_char_list(term()) -> boolean().
unicode_char_list([C|Cs]) when is_integer(C), C >= 0, C < 16#D800;
is_integer(C), C > 16#DFFF, C < 16#FFFE;
is_integer(C), C > 16#FFFF, C =< 16#10FFFF ->
unicode_char_list(Cs);
unicode_char_list([]) -> true;
unicode_char_list(_) -> false. %Everything else is false
-spec deep_char_list(term()) -> boolean().
deep_char_list(Cs) ->
deep_char_list(Cs, []).
deep_char_list([C|Cs], More) when is_list(C) ->
deep_char_list(C, [Cs|More]);
deep_char_list([C|Cs], More) when is_integer(C), C >= $\000, C =< $\377 ->
deep_char_list(Cs, More);
deep_char_list([], [Cs|More]) ->
deep_char_list(Cs, More);
deep_char_list([], []) -> true;
deep_char_list(_, _More) -> %Everything else is false
false.
-spec deep_unicode_char_list(term()) -> boolean().
deep_unicode_char_list(Cs) ->
deep_unicode_char_list(Cs, []).
deep_unicode_char_list([C|Cs], More) when is_list(C) ->
deep_unicode_char_list(C, [Cs|More]);
deep_unicode_char_list([C|Cs], More)
when is_integer(C), C >= 0, C < 16#D800;
is_integer(C), C > 16#DFFF, C < 16#FFFE;
is_integer(C), C > 16#FFFF, C =< 16#10FFFF ->
deep_unicode_char_list(Cs, More);
deep_unicode_char_list([], [Cs|More]) ->
deep_unicode_char_list(Cs, More);
deep_unicode_char_list([], []) -> true;
deep_unicode_char_list(_, _More) -> %Everything else is false
false.
%% printable_list([Char]) -> boolean()
%% Return true if CharList is a list of printable characters, else
%% false.
-spec printable_list(term()) -> boolean().
printable_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 ->
printable_list(Cs);
printable_list([C|Cs]) when is_integer(C), C >= $\240, C =< $\377 ->
printable_list(Cs);
printable_list([$\n|Cs]) -> printable_list(Cs);
printable_list([$\r|Cs]) -> printable_list(Cs);
printable_list([$\t|Cs]) -> printable_list(Cs);
printable_list([$\v|Cs]) -> printable_list(Cs);
printable_list([$\b|Cs]) -> printable_list(Cs);
printable_list([$\f|Cs]) -> printable_list(Cs);
printable_list([$\e|Cs]) -> printable_list(Cs);
printable_list([]) -> true;
printable_list(_) -> false. %Everything else is false
%% printable_unicode_list([Char]) -> boolean()
%% Return true if CharList is a list of printable characters, else
%% false. The notion of printable in Unicode terms is somewhat floating.
%% Everything that is not a control character and not invalid unicode
%% will be considered printable.
-spec printable_unicode_list(term()) -> boolean().
printable_unicode_list([C|Cs]) when is_integer(C), C >= $\040, C =< $\176 ->
printable_unicode_list(Cs);
printable_unicode_list([C|Cs])
when is_integer(C), C >= 16#A0, C < 16#D800;
is_integer(C), C > 16#DFFF, C < 16#FFFE;
is_integer(C), C > 16#FFFF, C =< 16#10FFFF ->
printable_unicode_list(Cs);
printable_unicode_list([$\n|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\r|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\t|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\v|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\b|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\f|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([$\e|Cs]) -> printable_unicode_list(Cs);
printable_unicode_list([]) -> true;
printable_unicode_list(_) -> false. %Everything else is false
%% List = nl()
%% Return a list of characters to generate a newline.
-spec nl() -> string().
nl() ->
"\n".
%%
%% Utilities for collecting characters in input files
%%
count_and_find_utf8(Bin,N) ->
cafu(Bin,N,0,0,none).
cafu(<<>>,_N,Count,_ByteCount,SavePos) ->
{Count,SavePos};
cafu(<<_/utf8,Rest/binary>>, 0, Count, ByteCount, _SavePos) ->
cafu(Rest,-1,Count+1,0,ByteCount);
cafu(<<_/utf8,Rest/binary>>, N, Count, _ByteCount, SavePos) when N < 0 ->
cafu(Rest,-1,Count+1,0,SavePos);
cafu(<<_/utf8,Rest/binary>> = Whole, N, Count, ByteCount, SavePos) ->
Delta = byte_size(Whole) - byte_size(Rest),
cafu(Rest,N-1,Count+1,ByteCount+Delta,SavePos);
cafu(_Other,_N,Count,_ByteCount,SavePos) -> % Non Utf8 character at end
{Count,SavePos}.
%% collect_chars(State, Data, Count). New in R9C.
%% Returns:
%% {stop,Result,RestData}
%% NewState
%%% BC (with pre-R13).
collect_chars(Tag, Data, N) ->
collect_chars(Tag, Data, latin1, N).
%% Now we are aware of encoding...
collect_chars(start, Data, unicode, N) when is_binary(Data) ->
{Size,Npos} = count_and_find_utf8(Data,N),
if Size > N ->
{B1,B2} = split_binary(Data, Npos),
{stop,B1,B2};
Size < N ->
{binary,[Data],N-Size};
true ->
{stop,Data,eof}
end;
collect_chars(start, Data, latin1, N) when is_binary(Data) ->
Size = byte_size(Data),
if Size > N ->
{B1,B2} = split_binary(Data, N),
{stop,B1,B2};
Size < N ->
{binary,[Data],N-Size};
true ->
{stop,Data,eof}
end;
collect_chars(start,Data,_,N) when is_list(Data) ->
collect_chars_list([], N, Data);
collect_chars(start, eof, _,_) ->
{stop,eof,eof};
collect_chars({binary,Stack,_N}, eof, _,_) ->
{stop,binrev(Stack),eof};
collect_chars({binary,Stack,N}, Data,unicode, _) ->
{Size,Npos} = count_and_find_utf8(Data,N),
if Size > N ->
{B1,B2} = split_binary(Data, Npos),
{stop,binrev(Stack, [B1]),B2};
Size < N ->
{binary,[Data|Stack],N-Size};
true ->
{stop,binrev(Stack, [Data]),eof}
end;
collect_chars({binary,Stack,N}, Data,latin1, _) ->
Size = byte_size(Data),
if Size > N ->
{B1,B2} = split_binary(Data, N),
{stop,binrev(Stack, [B1]),B2};
Size < N ->
{binary,[Data|Stack],N-Size};
true ->
{stop,binrev(Stack, [Data]),eof}
end;
collect_chars({list,Stack,N}, Data, _,_) ->
collect_chars_list(Stack, N, Data);
%% collect_chars(Continuation, MoreChars, Count)
%% Returns:
%% {done,Result,RestChars}
%% {more,Continuation}
collect_chars([], Chars, _, N) ->
collect_chars1(N, Chars, []);
collect_chars({Left,Sofar}, Chars, _, _N) ->
collect_chars1(Left, Chars, Sofar).
collect_chars1(N, Chars, Stack) when N =< 0 ->
{done,lists:reverse(Stack, []),Chars};
collect_chars1(N, [C|Rest], Stack) ->
collect_chars1(N-1, Rest, [C|Stack]);
collect_chars1(_N, eof, []) ->
{done,eof,[]};
collect_chars1(_N, eof, Stack) ->
{done,lists:reverse(Stack, []),[]};
collect_chars1(N, [], Stack) ->
{more,{N,Stack}}.
collect_chars_list(Stack, 0, Data) ->
{stop,lists:reverse(Stack, []),Data};
collect_chars_list(Stack, _N, eof) ->
{stop,lists:reverse(Stack, []),eof};
collect_chars_list(Stack, N, []) ->
{list,Stack,N};
collect_chars_list(Stack,N, [H|T]) ->
collect_chars_list([H|Stack], N-1, T).
%% collect_line(Continuation, MoreChars)
%% Returns:
%% {done,Result,RestChars}
%% {more,Continuation}
%%
%% XXX Can be removed when compatibility with pre-R12B-5 nodes
%% is no longer required.
%%
collect_line([], Chars) ->
collect_line1(Chars, []);
collect_line({SoFar}, More) ->
collect_line1(More, SoFar).
collect_line1([$\r, $\n|Rest], Stack) ->
collect_line1([$\n|Rest], Stack);
collect_line1([$\n|Rest], Stack) ->
{done,lists:reverse([$\n|Stack], []),Rest};
collect_line1([C|Rest], Stack) ->
collect_line1(Rest, [C|Stack]);
collect_line1(eof, []) ->
{done,eof,[]};
collect_line1(eof, Stack) ->
{done,lists:reverse(Stack, []),[]};
collect_line1([], Stack) ->
{more,{Stack}}.
%% collect_line(State, Data, _). New in R9C.
%% Returns:
%% {stop,Result,RestData}
%% NewState
%%% BC (with pre-R13).
collect_line(Tag, Data, Any) ->
collect_line(Tag, Data, latin1, Any).
%% Now we are aware of encoding...
collect_line(start, Data, Encoding, _) when is_binary(Data) ->
collect_line_bin(Data, Data, [], Encoding);
collect_line(start, Data, _, _) when is_list(Data) ->
collect_line_list(Data, []);
collect_line(start, eof, _, _) ->
{stop,eof,eof};
collect_line(Stack, Data, Encoding, _) when is_binary(Data) ->
collect_line_bin(Data, Data, Stack, Encoding);
collect_line(Stack, Data, _, _) when is_list(Data) ->
collect_line_list(Data, Stack);
collect_line([B|_]=Stack, eof, _, _) when is_binary(B) ->
{stop,binrev(Stack),eof};
collect_line(Stack, eof, _, _) ->
{stop,lists:reverse(Stack, []),eof}.
collect_line_bin(<<$\n,T/binary>>, Data, Stack0, _) ->
N = byte_size(Data) - byte_size(T),
<<Line:N/binary,_/binary>> = Data,
case Stack0 of
[] ->
{stop,Line,T};
[<<$\r>>|Stack] when N =:= 1 ->
{stop,binrev(Stack, [$\n]),T};
_ ->
{stop,binrev(Stack0, [Line]),T}
end;
collect_line_bin(<<$\r,$\n,T/binary>>, Data, Stack, _) ->
N = byte_size(Data) - byte_size(T) - 2,
<<Line:N/binary,_/binary>> = Data,
{stop,binrev(Stack, [Line,$\n]),T};
collect_line_bin(<<$\r>>, Data0, Stack, _) ->
N = byte_size(Data0) - 1,
<<Data:N/binary,_/binary>> = Data0,
[<<$\r>>,Data|Stack];
collect_line_bin(<<_,T/binary>>, Data, Stack, Enc) ->
collect_line_bin(T, Data, Stack, Enc);
collect_line_bin(<<>>, Data, Stack, _) ->
%% Need more data here.
[Data|Stack].
collect_line_list([$\n|T], [$\r|Stack]) ->
{stop,lists:reverse(Stack, [$\n]),T};
collect_line_list([$\n|T], Stack) ->
{stop,lists:reverse(Stack, [$\n]),T};
collect_line_list([H|T], Stack) ->
collect_line_list(T, [H|Stack]);
collect_line_list([], Stack) ->
Stack.
%% Translator function to emulate a new (R9C and later)
%% I/O client when you have an old one.
%%
%% Implements a middleman that is get_until server and get_chars client.
%%% BC (with pre-R13).
get_until(Any,Data,Arg) ->
get_until(Any,Data,latin1,Arg).
%% Now we are aware of encoding...
get_until(start, Data, Encoding, XtraArg) ->
get_until([], Data, Encoding, XtraArg);
get_until(Cont, Data, Encoding, {Mod, Func, XtraArgs}) ->
Chars = if is_binary(Data), Encoding =:= unicode ->
unicode:characters_to_list(Data,utf8);
is_binary(Data) ->
binary_to_list(Data);
true ->
Data
end,
case apply(Mod, Func, [Cont,Chars|XtraArgs]) of
{done,Result,Buf} ->
{stop,if is_binary(Data),
is_list(Result),
Encoding =:= unicode ->
unicode:characters_to_binary(Result,unicode,unicode);
is_binary(Data),
is_list(Result) ->
erlang:iolist_to_binary(Result);
%% is_list(Data),
%% is_list(Result),
%% Encoding =:= latin1 ->
%% % Should check for only latin1, but skip that for
%% % efficiency reasons.
%% [ exit({cannot_convert, unicode, latin1}) ||
%% X <- List, X > 255 ];
true ->
Result
end,
Buf};
{more,NewCont} ->
NewCont
end.
binrev(L) ->
list_to_binary(lists:reverse(L, [])).
binrev(L, T) ->
list_to_binary(lists:reverse(L, T)).
