The R13B03 release.OTP_R13B03

1 files changed, 1345 insertions, 0 deletions

diff --git a/lib/stdlib/test/file_sorter_SUITE.erl b/lib/stdlib/test/file_sorter_SUITE.erl
new file mode 100644
index 0000000000..c00ed91fe7
--- /dev/null
+++ b/lib/stdlib/test/file_sorter_SUITE.erl
@@ -0,0 +1,1345 @@
+%%
+%% %CopyrightBegin%
+%% 
+%% Copyright Ericsson AB 2001-2009. 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%
+%%
+-module(file_sorter_SUITE).
+
+%-define(debug, true).
+
+-ifdef(debug).
+-define(format(S, A), io:format(S, A)).
+-define(line, put(line, ?LINE), ).
+-define(config(X,Y), foo).
+-define(t,test_server).
+-define(privdir(_), "./file_sorter_SUITE_priv").
+-else.
+-include("test_server.hrl").
+-define(format(S, A), ok).
+-define(privdir(Conf), ?config(priv_dir, Conf)).
+-endif.
+
+-export([all/1, basic/1, badarg/1, 
+	 term_sort/1, term_keysort/1,
+	 binary_term_sort/1, binary_term_keysort/1,
+	 binary_sort/1, 
+	 term_merge/1, term_keymerge/1, 
+	 binary_term_merge/1, binary_term_keymerge/1,
+	 binary_merge/1,
+	 term_check/1, term_keycheck/1,
+	 binary_term_check/1, binary_term_keycheck/1,
+	 binary_check/1,
+	 inout/1, misc/1, many/1]).
+
+-export([init_per_testcase/2, fin_per_testcase/2]).
+
+init_per_testcase(_Case, Config) ->
+    Dog=?t:timetrap(?t:minutes(2)),
+    [{watchdog, Dog}|Config].
+
+fin_per_testcase(_Case, Config) ->
+    Dog=?config(watchdog, Config),
+    test_server:timetrap_cancel(Dog),
+    ok.
+
+all(suite) ->
+    {req,[stdlib,kernel],
+     [basic, badarg, 
+      term_sort, term_keysort, 
+      binary_term_sort, binary_term_keysort, 
+      binary_sort, 
+      term_merge, term_keymerge, 
+      binary_term_merge, binary_term_keymerge,
+      binary_merge,
+      term_check, binary_term_keycheck,
+      binary_term_check, binary_term_keycheck,
+      binary_check,
+      inout, misc, many]}.
+
+basic(doc) ->
+    ["Basic test case."];
+basic(suite) -> 
+    [];
+basic(Config) when is_list(Config) ->
+    Fmt = binary,
+    Arg = {format,Fmt},
+    Foo = outfile(foo, Config),
+    P0 = pps(),
+
+    ?line F1s = [F1] = to_files([[]], Fmt, Config),
+    ?line ok = file_sorter:sort(F1),
+    ?line [] = from_files(F1, Fmt),
+    ?line ok = file_sorter:keysort(17, F1),
+    ?line [] = from_files(F1, Fmt),
+    ?line ok = file_sorter:merge(F1s, Foo),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keymerge(17, F1s, Foo),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files([Foo | F1s]),
+
+    ?line [F2] = to_files([[foo,bar]], Fmt, Config),
+    ?line ok = file_sorter:sort([F2], F2, Arg),
+    ?line [bar,foo] = from_files(F2, Fmt),
+    ?line delete_files(F2),
+
+    ?line Fs1 = to_files([[foo],[bar]], Fmt, Config),
+    ?line ok = file_sorter:sort(Fs1, Foo, Arg),
+    ?line [bar,foo] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:merge(Fs1, Foo, Arg),
+    ?line [bar,foo] = from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs1]),
+
+    ?line Fmt2 = binary_term,
+    ?line Arg2 = {format, Fmt2},
+    ?line [F3] = to_files([[{foo,1},{bar,2}]], Fmt2, Config),
+    ?line ok = file_sorter:keysort([2], [F3], F3, Arg2),
+    ?line [{foo,1},{bar,2}] = from_files(F3, Fmt2),
+    ?line delete_files(F3),
+
+    ?line Fs2 = to_files([[{foo,1}],[{bar,2}]], Fmt2, Config),
+    ?line ok = file_sorter:keysort(1, Fs2, Foo, Arg2),
+    ?line [{bar,2},{foo,1}] = from_files(Foo, Fmt2),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keymerge(1, Fs2, Foo, Arg2),
+    ?line [{bar,2},{foo,1}] = from_files(Foo, Fmt2),
+    ?line delete_files([Foo | Fs2]),
+
+    ?line true = P0 =:= pps(),
+
+    ok.
+
+badarg(doc) ->
+    ["Call functions with bad arguments."];
+badarg(suite) -> 
+    [];
+badarg(Config) when is_list(Config) ->
+    PrivDir = ?privdir(Config),
+    BadFile = filename:join(PrivDir, "not_a_file"),
+    ABadFile = filename:absname(BadFile),
+    ?line file:delete(BadFile),
+    ?line {error,{file_error,ABadFile,enoent}} = 
+	file_sorter:sort(BadFile),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:sort({flipp})),
+    ?line {error,{file_error,ABadFile,enoent}} = 
+	file_sorter:keysort(1, BadFile),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:keysort(1, {flipp})),
+
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:merge([{flipp}],foo)),
+    ?line {error,{file_error,ABadFile,enoent}} = 
+	file_sorter:keymerge(1,[BadFile],foo),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:keymerge(1,[{flipp}],foo)),
+    ?line {'EXIT', {{badarg, _}, _}} = 
+	(catch file_sorter:merge(fun(X) -> X end, foo)),
+    ?line {'EXIT', {{badarg, _}, _}} = 
+	(catch file_sorter:keymerge(1, fun(X) -> X end, foo)),
+
+    ?line {error,{file_error,ABadFile,enoent}} = 
+	file_sorter:check(BadFile),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:check({flipp})),
+    ?line {error,{file_error,ABadFile,enoent}} = 
+	file_sorter:keycheck(1, BadFile),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:keycheck(1, {flipp})),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:check([{flipp}],foo)),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:keycheck(1,[{flipp}],foo)),
+    ?line {'EXIT', {{badarg, _}, _}} = 
+	(catch file_sorter:check(fun(X) -> X end, foo)),
+    ?line {'EXIT', {{badarg, _}, _}} = 
+	(catch file_sorter:keycheck(1, fun(X) -> X end, foo)),
+
+    ?line Fs1 = to_files([[1,2,3]], binary_term, Config),
+    ?line {'EXIT', {{badarg, flipp}, _}} = 
+	(catch file_sorter:check(Fs1 ++ flipp, [])),
+    [F1] = Fs1,
+    ?line {error,{file_error,_,_}} = 
+        file_sorter:sort(Fs1, foo, [{tmpdir,F1},{size,0}]),
+    ?line delete_files(Fs1),
+    ?line Fs2 = to_files([[1,2,3]], binary_term, Config),
+    {error,{file_error,_,enoent}} = 
+	file_sorter:sort(Fs2, foo, [{tmpdir,filename:absname(BadFile)},
+                                    {size,0}]),
+    ?line delete_files(Fs2),
+
+    ?line {'EXIT', {{badarg, bad}, _}} = 
+	(catch file_sorter:check([], [{format,term} | bad])),
+    ?line {'EXIT', {{badarg, [{flipp}]}, _}} = 
+	(catch file_sorter:check([{flipp}])),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch file_sorter:keycheck(1, {flipp})),
+    ?line {'EXIT', {{badarg, [{flipp}]}, _}} = 
+	(catch file_sorter:keycheck(2, [{flipp}])),
+    ?line {error,{file_error,_,eisdir}} = file_sorter:keycheck(1, []),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch file_sorter:keycheck(kp, [])),
+    ?line {'EXIT', {{badarg, kp}, _}} = 
+	(catch file_sorter:keycheck([1, kp], [])),
+    ?line {'EXIT', {{badarg, kp}, _}} = 
+	(catch file_sorter:keycheck([1 | kp], [])),
+    ?line {'EXIT', {{badarg, []}, _}} = (catch file_sorter:keycheck([], [])),
+    ?line {'EXIT', {{badarg, {format, foo}}, _}} = 
+	(catch file_sorter:check([], {format,foo})),
+    ?line {'EXIT', {{badarg, not_an_option}, _}} = 
+	(catch file_sorter:keycheck(7, [], [not_an_option])),
+    ?line {'EXIT', {{badarg, format}, _}} = 
+	(catch file_sorter:keycheck(1, [], [{format, binary}])),
+    ?line {'EXIT', {{badarg, order}, _}} = 
+	(catch file_sorter:keycheck(1, [], [{order, fun compare/2}])),
+
+    ?line do_badarg(fun(I, O) -> file_sorter:sort(I, O) end,
+		    fun(Kp, I, O) -> file_sorter:keysort(Kp, I, O) end,
+		    BadFile),
+    ?line do_badarg_opt(fun(I, O, X) -> file_sorter:sort(I, O, X) end,
+			fun(Kp, I, O, X) -> file_sorter:keysort(Kp, I, O, X) 
+			end),
+    ?line do_badarg(fun(I, O) -> file_sorter:merge(I, O) end,
+		    fun(Kp, I, O) -> file_sorter:keymerge(Kp, I, O) end, 
+		    BadFile),
+    ?line do_badarg_opt(fun(I, O, X) -> file_sorter:merge(I, O, X) end,
+			fun(Kp, I, O, X) -> file_sorter:keymerge(Kp, I, O, X) 
+			end).
+
+do_badarg(F, KF, BadFile) ->
+    [Char | _] = BadFile,
+    AFlipp = filename:absname(flipp),
+    ?line {error,{file_error,AFlipp,enoent}} = F([flipp | flopp], foo),
+    ?line {'EXIT', {{badarg, {foo,bar}}, _}} = (catch F([], {foo,bar})),
+    ?line {'EXIT', {{badarg, Char}, _}} = (catch F(BadFile, [])),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = (catch F({flipp}, [])),
+
+    ?line {'EXIT', {{badarg, Char}, _}} = (catch KF(1, BadFile, [])),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = (catch KF(1, {flipp}, [])),
+    ?line {error,{file_error,AFlipp,enoent}} = 
+	KF(2, [flipp | flopp], foo),
+    ?line {'EXIT', {{badarg, {foo,bar}}, _}} = (catch KF(1, [], {foo,bar})),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF(kp, [], foo)),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF([1, kp], [], foo)),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF([1 | kp], [], foo)),
+    ?line {'EXIT', {{badarg, []}, _}} = (catch KF([], [], foo)),
+    ok.
+
+do_badarg_opt(F, KF) ->
+    AFlipp = filename:absname(flipp),
+    ?line {error,{file_error,AFlipp,enoent}} = 
+	   F([flipp | flopp], foo, []),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = (catch F([{flipp}], foo, [])),
+    ?line {'EXIT', {{badarg, {out,put}}, _}} = (catch F([], {out,put}, [])),
+    ?line {'EXIT', {{badarg, not_an_option}, _}} = 
+	(catch F([], foo, [not_an_option])),
+    ?line {'EXIT', {{badarg, {format, foo}}, _}} = 
+	   (catch F([], foo, {format,foo})),
+    ?line {'EXIT', {{badarg, {size,foo}}, _}} = (catch F([], foo, {size,foo})),
+
+    ?line {'EXIT', {{badarg, {size, -1}}, _}} = (catch F([], foo, {size,-1})),
+    ?line {'EXIT', {{badarg, {no_files, foo}}, _}} = 
+	(catch F([], foo, {no_files,foo})),
+    ?line {'EXIT', {{badarg, {no_files, 1}}, _}} = 
+	(catch F([], foo, {no_files,1})),
+    ?line {'EXIT', {{badarg, 1}, _}} = (catch F([], foo, {tmpdir,1})),
+    ?line {'EXIT', {{badarg, {order,1}}, _}} = (catch F([], foo, {order,1})),
+    ?line {'EXIT', {{badarg, {compressed, flopp}}, _}} = 
+	   (catch F([], foo, {compressed,flopp})),
+    ?line {'EXIT', {{badarg, {unique,flopp}}, _}} = 
+	   (catch F([], foo, {unique,flopp})),
+    ?line {'EXIT', {{badarg, {header,foo}}, _}} = 
+	(catch F([], foo, {header,foo})),
+    ?line {'EXIT', {{badarg, {header, 0}}, _}} = 
+	(catch F([], foo, {header,0})),
+    ?line {'EXIT', {{badarg, {header, 1 bsl 35}}, _}} = 
+	(catch F([], foo, {header,1 bsl 35})),
+    ?line {'EXIT', {{badarg, header}, _}} = 
+	(catch F([], foo, [{header,1},{format,term}])),
+
+    ?line {'EXIT', {{badarg, not_an_option}, _}} = 
+	(catch KF(7, [], foo, [not_an_option])),
+    ?line {'EXIT', {{badarg,format}, _}} = 
+	(catch KF(1, [], foo, [{format, binary}])),
+    ?line {'EXIT', {{badarg, order}, _}} = 
+	(catch KF(1, [], foo, [{order, fun compare/2}])),
+    ?line {'EXIT', {{badarg, {flipp}}, _}} = 
+	(catch KF(2, [{flipp}], foo,[])),
+    ?line {error,{file_error,AFlipp,enoent}} = 
+	KF(2, [flipp | flopp], foo,[]),
+    ?line {'EXIT', {{badarg, {out, put}}, _}} = 
+	(catch KF(1, [], {out,put}, [])),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF(kp, [], foo, [])),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF([1, kp], [], foo, [])),
+    ?line {'EXIT', {{badarg, kp}, _}} = (catch KF([1 | kp], [], foo, [])),
+    ok.
+
+term_sort(doc) ->
+    ["Sort terms on files."];
+term_sort(suite) ->
+    [];
+term_sort(Config) when is_list(Config) ->
+    ?line sort(term, [{compressed,false}], Config),
+    ?line sort(term, [{order, fun compare/2}], Config),
+    ?line sort(term, [{order, ascending}, {compressed,true}], Config),
+    ?line sort(term, [{order, descending}], Config),
+    ok.
+
+term_keysort(doc) ->
+    ["Keysort terms on files."];
+term_keysort(suite) ->
+    [];
+term_keysort(Config) when is_list(Config) ->
+    ?line keysort(term, [{tmpdir, ""}], Config),
+    ?line keysort(term, [{order,descending}], Config),
+    ok.
+
+binary_term_sort(doc) ->
+    ["Sort binary terms on files."];
+binary_term_sort(suite) ->
+    [];
+binary_term_sort(Config) when is_list(Config) ->
+    PrivDir = ?privdir(Config),
+    ?line sort({2, binary_term}, [], Config),
+    ?line sort(binary_term, [{tmpdir, list_to_atom(PrivDir)}], Config),
+    ?line sort(binary_term, [{tmpdir,PrivDir}], Config),
+    ?line sort({3,binary_term}, [{order, fun compare/2}], Config),
+    ?line sort(binary_term, [{order, fun compare/2}], Config),
+    ?line sort(binary_term, [{order,descending}], Config),
+    ok.
+
+binary_term_keysort(doc) ->
+    ["Keysort binary terms on files."];
+binary_term_keysort(suite) ->
+    [];
+binary_term_keysort(Config) when is_list(Config) ->
+    ?line keysort({3, binary_term}, [], Config),
+    ?line keysort(binary_term, [], Config),
+    ?line keysort(binary_term, [{order,descending}], Config),
+    ok.
+
+binary_sort(doc) ->
+    ["Sort binaries on files."];
+binary_sort(suite) ->
+    [];
+binary_sort(Config) when is_list(Config) ->
+    PrivDir = ?privdir(Config),
+    ?line sort({2, binary}, [], Config),
+    ?line sort(binary, [{tmpdir, list_to_atom(PrivDir)}], Config),
+    ?line sort(binary, [{tmpdir,PrivDir}], Config),
+    ?line sort({3,binary}, [{order, fun compare/2}], Config),
+    ?line sort(binary, [{order, fun compare/2}], Config),
+    ?line sort(binary, [{order,descending}], Config),
+    ok.
+
+term_merge(doc) ->
+    ["Merge terms on files."];
+term_merge(suite) ->
+    [];
+term_merge(Config) when is_list(Config) ->
+    ?line merge(term, [{order, fun compare/2}], Config),
+    ?line merge(term, [{order, ascending}, {compressed,true}], Config),
+    ?line merge(term, [{order, descending}, {compressed,false}], Config),
+    ok.
+
+term_keymerge(doc) ->
+    ["Keymerge terms on files."];
+term_keymerge(suite) ->
+    [];
+term_keymerge(Config) when is_list(Config) ->
+    ?line keymerge(term, [], Config),
+    ?line keymerge(term, [{order, descending}], Config),
+    ?line funmerge(term, [], Config),
+    ok.
+
+binary_term_merge(doc) ->
+    ["Merge binary terms on files."];
+binary_term_merge(suite) ->
+    [];
+binary_term_merge(Config) when is_list(Config) ->
+    ?line merge(binary_term, [], Config),
+    ?line merge({7, binary_term}, [], Config),
+    ?line merge({3, binary_term}, [{order, fun compare/2}], Config),
+    ok.
+
+binary_term_keymerge(doc) ->
+    ["Keymerge binary terms on files."];
+binary_term_keymerge(suite) ->
+    [];
+binary_term_keymerge(Config) when is_list(Config) ->
+    ?line keymerge({3, binary_term}, [], Config),
+    ?line keymerge(binary_term, [], Config),
+    ?line funmerge({3, binary_term}, [], Config),
+    ?line funmerge(binary_term, [], Config),
+    ok.
+
+binary_merge(doc) ->
+    ["Merge binaries on files."];
+binary_merge(suite) ->
+    [];
+binary_merge(Config) when is_list(Config) ->
+    ?line merge(binary, [], Config),
+    ?line merge({7, binary}, [], Config),
+    ?line merge({3, binary}, [{order, fun compare/2}], Config),
+    ok.
+
+term_check(doc) ->
+    ["Check terms on files."];
+term_check(suite) ->
+    [];
+term_check(Config) when is_list(Config) ->
+    ?line check(term, Config),
+    ok.
+
+binary_term_check(doc) ->
+    ["Check binary terms on files."];
+binary_term_check(suite) ->
+    [];
+binary_term_check(Config) when is_list(Config) ->
+    ?line check(binary_term, Config),
+    ok.
+
+term_keycheck(doc) ->
+    ["Keycheck terms on files."];
+term_keycheck(suite) ->
+    [];
+term_keycheck(Config) when is_list(Config) ->
+    ?line keycheck(term, Config),
+    ok.
+
+binary_term_keycheck(doc) ->
+    ["Keycheck binary terms on files."];
+binary_term_keycheck(suite) ->
+    [];
+binary_term_keycheck(Config) when is_list(Config) ->
+    ?line keycheck(binary_term, Config),
+    ok.
+
+binary_check(doc) ->
+    ["Check binary terms on files."];
+binary_check(suite) ->
+    [];
+binary_check(Config) when is_list(Config) ->
+    ?line check(binary, Config),
+    ok.
+
+inout(doc) ->
+    ["Funs as input or output."];
+inout(suite) ->
+    [];
+inout(Config) when is_list(Config) ->
+    BTF = {format, binary_term},
+    Foo = outfile(foo, Config),
+
+    %% Input is fun.
+    End = fun(read) -> end_of_input end,
+
+    IF1 = fun(read) -> {[1,7,5], End} end,
+    ?line ok = file_sorter:sort(IF1, Foo, [{format, term}]),
+    %% 'close' is called, but the return value is caught and ignored.
+    IF2 = fun(read) -> {[1,2,3], fun(close) -> throw(ignored) end} end,
+    ?line {error, bad_object} = file_sorter:sort(IF2, Foo, BTF),
+
+    IF3 = fun(no_match) -> foo end,
+    ?line {'EXIT', {function_clause, _}} = 
+	(catch file_sorter:sort(IF3, Foo)),
+    IF4 = fun(read) -> throw(my_message) end,
+    ?line my_message = (catch file_sorter:sort(IF4, Foo)),
+    IF5 = fun(read) -> {error, my_error} end,
+    ?line {error, my_error} = file_sorter:sort(IF5, Foo),
+
+    %% Output is fun.
+    ?line {error, bad_object} = 
+	file_sorter:sort(IF2, fun(close) -> ignored end, BTF),
+    Args = [{format, term}],
+    ?line {error, bad_object} = 
+       file_sorter:keysort(1, IF2, fun(close) -> ignored end, Args),
+    OF1 = fun(close) -> fine; (L) when is_list(L) -> fun(close) -> nice end end,
+    ?line nice = file_sorter:sort(IF1, OF1, Args),
+    OF2 = fun(_) -> my_return end,
+    ?line my_return = file_sorter:sort(IF1, OF2, Args),
+    OF3 = fun(_) -> throw(my_message) end,
+    ?line my_message = (catch file_sorter:sort(IF1, OF3, Args)),
+    OF4 = fun(no_match) -> foo end,
+    ?line {'EXIT', {function_clause, _}} = 
+	(catch file_sorter:sort(IF1, OF4, Args)),
+
+    ?line P0 = pps(),
+    ?line Fs1 = to_files([[3,1,2,5,4], [8,3,10]], term, Config),
+    ?line error = file_sorter:sort(Fs1, fun(_) -> error end, Args),
+    ?line delete_files(Fs1),
+
+    ?line true = P0 =:= pps(),
+
+    %% Passing a value from the input functions to the output functions.
+    IFV1 = fun(read) -> {end_of_input, 17} end,
+    OFV1 = fun({value, Value}) -> ofv(Value, []) end,
+    ?line {17, []} = file_sorter:sort(IFV1, OFV1, Args),
+
+    %% Output is not a fun. The value returned by input funs is ignored.
+    %% OTP-5009.
+    ?line ok = file_sorter:sort(IFV1, Foo, [{format,term}]),
+    ?line [] = from_files(Foo, term),
+    ?line delete_files(Foo),
+
+    ok.
+
+ofv(Value, A) ->
+    fun(close) -> 
+	    {Value, lists:append(lists:reverse(A))};
+       (L) when is_list(L) ->
+	    ofv(Value, [L | A])
+    end.
+
+many(doc) ->
+    ["Many temporary files."];
+many(suite) ->
+    [];
+many(Config) when is_list(Config) ->
+    Foo = outfile(foo, Config),
+    PrivDir = ?privdir(Config),
+    P0 = pps(),
+
+    Args = [{format, term}],
+    L1 = lists:map(fun(I) -> {one, two, three, I} end, lists:seq(1,1000)),
+    L2 = lists:map(fun(I) -> {four, five, six, I} end, lists:seq(1,1000)),
+    ?line Fs2 = to_files([L1, L2], term, Config),
+    ?line ok = file_sorter:sort(Fs2, Foo, [{size,1000} | Args]),
+    ?line R = lists:sort(L1++L2),
+    ?line R = from_files(Foo, term),
+    ?line 2000 = length(R),
+    ?line ok = file_sorter:sort(Fs2, Foo, [{no_files,4},{size,1000} | Args]),
+    ?line R = from_files(Foo, term),
+    ?line ok = 
+	file_sorter:sort(Fs2, Foo, 
+			 [{no_files,4},{size,1000},{order,descending} | Args]),
+    ?line true = lists:reverse(R) =:= from_files(Foo, term),
+    ?line ok = 
+	file_sorter:sort(Fs2, Foo, 
+			 [{no_files,4},{size,1000},
+			  {order,fun compare/2} | Args]),
+    ?line R = from_files(Foo, term),
+    ?line ok = file_sorter:keysort(4, Fs2, Foo, 
+				   [{no_files,4},{size,1000} | Args]),
+    ?line RK = lists:keysort(4, L1++L2),
+    ?line RK = from_files(Foo, term),
+    ?line delete_files(Foo),
+    ?line ok = 
+	file_sorter:keysort(4, Fs2, Foo, 
+		      [{no_files,4},{size,1000},{order,descending} | Args]),
+    ?line true = lists:reverse(RK) =:= from_files(Foo, term),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keysort(4, Fs2, Foo, 
+				   [{size,500},{order,descending} | Args]),
+    ?line true = lists:reverse(RK) =:= from_files(Foo, term),
+    ?line delete_files(Foo),
+    ?line error = file_sorter:sort(Fs2, fun(_) -> error end, 
+				   [{tmpdir, PrivDir}, {no_files,3}, 
+				    {size,10000} | Args]),
+
+    TmpDir = filename:join(PrivDir, "tmpdir"),
+    file:del_dir(TmpDir),
+    ?line ok = file:make_dir(TmpDir),
+    ?line case os:type() of
+	      {unix, _} ->
+		  ?line ok = file:change_mode(TmpDir, 8#0000),
+		  ?line {error, {file_error, _,_}} = 
+		      file_sorter:sort(Fs2, fun(_M) -> foo end, 
+				       [{no_files,3},{size,10000},
+					{tmpdir,TmpDir} | Args]);
+	      _ ->
+		  true
+	  end,
+    ?line ok = file:del_dir(TmpDir),
+    delete_files(Fs2),
+    ?line true = P0 =:= pps(),
+    ok.
+
+misc(doc) ->
+    ["Some other tests."];
+misc(suite) ->
+    [];
+misc(Config) when is_list(Config) ->
+    BTF = {format, binary_term},
+    Foo = outfile(foo, Config),
+    FFoo = filename:absname(Foo),
+    P0 = pps(),
+
+    ?line [File] = Fs1 = to_files([[1,3,2]], term, Config),
+    ?line ok = file:write_file(Foo,<<>>),
+    ?line case os:type() of
+	      {unix, _} ->
+                  ok = file:change_mode(Foo, 8#0000),
+                  {error,{file_error,FFoo,eacces}} = 
+                      file_sorter:sort(Fs1, Foo, {format,term});
+              _ ->
+                  true
+          end,
+    ?line file:delete(Foo),
+    ?line NoBytes = 16, % RAM memory will never get this big, or?
+    ?line ALot = (1 bsl (NoBytes*8)) - 1,
+    ?line ok = file:write_file(File, <<ALot:NoBytes/unit:8,"foobar">>),
+    FFile = filename:absname(File),
+    ?line {error, {bad_object,FFile}} = 
+        file_sorter:sort(Fs1, Foo, [BTF, {header, 20}]),
+    ?line ok = file:write_file(File, <<30:32,"foobar">>),
+    ?line {error, {premature_eof, FFile}} = file_sorter:sort(Fs1, Foo, BTF),
+    ?line ok = file:write_file(File, <<6:32,"foobar">>),
+    ?line {error, {bad_object,FFile}} = file_sorter:sort(Fs1, Foo, BTF),
+    ?line case os:type() of
+              {unix, _} ->
+                  ok = file:change_mode(File, 8#0000),
+                  {error, {file_error,FFile,eacces}} = 
+                      file_sorter:sort(Fs1, Foo),
+                  {error, {file_error,FFile,eacces}} = 
+                      file_sorter:sort(Fs1, Foo, {format, binary_term});
+              _ ->
+                  true
+          end,
+    ?line delete_files(Fs1),
+    ?line true = P0 =:= pps(),
+
+    %% bigger than chunksize
+    ?line E1 = <<32000:32, 10:256000>>,
+    ?line E2 = <<32000:32, 5:256000>>,
+    ?line E3 = <<32000:32, 8:256000>>,
+    ?line ok = file:write_file(Foo, [E1, E2, E3]),
+    ?line ok = file_sorter:sort([Foo], Foo, [{format,binary},{size,10000}]),
+    ?line ok = file_sorter:sort([Foo], Foo, [{format,fun(X) -> X end},
+                                             {size,10000}]),
+    ?line Es = list_to_binary([E2,E3,E1]),
+    ?line {ok, Es} = file:read_file(Foo),
+    ?line delete_files(Foo),
+    ?line true = P0 =:= pps(),
+
+    %% keysort more than one element
+    L = [{c,1,a},{c,2,b},{c,3,c},{b,1,c},{b,2,b},{b,3,a},{a,1,a},{a,2,b},
+         {a,3,c}],
+    ?line Fs2 = to_files([L], binary_term, Config),
+    ?line ok = file_sorter:keysort([2,3], Fs2, Foo, {format, binary_term}),
+    ?line KS2_1 = from_files(Foo, binary_term),
+    ?line KS2_2 = lists:keysort(2,lists:keysort(3, L)),
+    ?line KS2_1 = KS2_2,
+    ?line ok = file_sorter:keysort([2,3], Fs2, Foo, 
+                                   [{format, binary_term},{size,5}]),
+    ?line KS2_3 = from_files(Foo, binary_term),
+    ?line KS2_3 = KS2_2,
+    ?line ok = file_sorter:keysort([2,3,1], Fs2, Foo, {format, binary_term}),
+    ?line KS3_1 = from_files(Foo, binary_term),
+    ?line KS3_2 = lists:keysort(2, lists:keysort(3,lists:keysort(1, L))),
+    ?line KS3_1 = KS3_2,
+    ?line ok = file_sorter:keysort([2,3,1], Fs2, Foo, 
+                                   [{format, binary_term},{size,5}]),
+    ?line KS3_3 = from_files(Foo, binary_term),
+    ?line KS3_3 = KS3_2,
+    ?line delete_files([Foo | Fs2]),
+    ?line true = P0 =:= pps(),
+
+    %% bigger than chunksize
+    %% Assumes that CHUNKSIZE = 16384. Illustrates that the Last argument
+    %% of merge_files/5 is necessary. 
+    ?line EP1 = erlang:make_tuple(2728,foo),
+    ?line EP2 = lists:duplicate(2729,qqq),
+    ?line LL = [EP1, EP2, EP1, EP2, EP1, EP2],
+    ?line Fs3 = to_files([LL], binary, Config),
+    ?line ok = file_sorter:sort(Fs3, Foo, [{format,binary}, {unique,true}]),
+    ?line [EP1,EP2] = from_files(Foo, binary),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:sort(Fs3, Foo, 
+                                [{format,binary_term}, {unique,true}, 
+                                 {size,30000}]),
+    ?line [EP1,EP2] = from_files(Foo, binary_term),
+    ?line delete_files([Foo | Fs3]),
+
+    ?line true = P0 =:= pps(),
+
+    ?line BE1 = <<20000:32, 17:160000>>,
+    ?line BE2 = <<20000:32, 1717:160000>>,
+    ?line ok = file:write_file(Foo, [BE1,BE2,BE1,BE2]),
+    ?line ok = file_sorter:sort([Foo], Foo, [{format,binary},
+                                             {size,10000},
+                                             {unique,true}]),
+    ?line BEs = list_to_binary([BE1, BE2]),
+    ?line {ok, BEs} = file:read_file(Foo),
+    ?line delete_files(Foo),
+    ?line true = P0 =:= pps(),
+
+    ?line Fs4 = to_files([[7,4,1]], binary_term, Config),
+    ?line {error, {bad_term, _}} = file_sorter:sort(Fs4, Foo, {format, term}),
+    ?line delete_files([Foo | Fs4]),
+    ?line true = P0 =:= pps(),
+
+    ok.
+
+%%% 
+%%% Utilities.
+%%% 
+
+sort(Fmt, XArgs, Config) ->
+    Args = make_args(Fmt, [{size,5} | XArgs]),
+    TmpArgs = [{tmpdir,?privdir(Config)} | Args],
+    Foo = outfile(foo, Config),
+
+    %% Input is a fun. Output is a fun.
+    ?line [] = file_sorter:sort(input([], 2, Fmt), output([], Fmt), Args),
+    ?line L1 = [3,1,2,5,4],
+    ?line S1 = file_sorter:sort(input(L1, 2, Fmt), output([], Fmt), TmpArgs),
+    ?line S1 = rev(lists:sort(L1), TmpArgs),
+
+    %% Input is a file. Output is a fun.
+    ?line [] = file_sorter:sort([], output([], Fmt), Args),
+    ?line L2 = [3,1,2,5,4],
+    ?line Fs1 = to_files([L2], Fmt, Config),
+    ?line S2 = file_sorter:sort(Fs1, output([], Fmt), TmpArgs),
+    ?line S2 = rev(lists:sort(L2), TmpArgs),
+    ?line delete_files(Fs1),
+
+    %% Input is a file. Output is a file
+    ?line ok = file_sorter:sort([], Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:sort([], Foo, [{unique,true} | Args]),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line L3 = [3,1,2,5,4,6],
+    ?line Fs2 = to_files([L3], Fmt, Config),
+    ?line ok = file_sorter:sort(Fs2, Foo, Args),
+    ?line true = rev(lists:sort(L3), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs2]),
+    ?line L4 = [1,3,4,1,2,5,4,5,6],
+    ?line Fs3 = to_files([L4], Fmt, Config),
+    ?line ok = file_sorter:sort(Fs3, Foo, Args++[{unique,true}, 
+						 {size,100000}]),
+    ?line true = rev(lists:usort(L4), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:sort(Fs3, Foo, Args++[{unique,true}]),
+    ?line true = rev(lists:usort(L4), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs3]),
+
+    %% Input is a fun. Output is a file.
+    ?line ok = file_sorter:sort(input([], 2, Fmt), Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line L5 = [3,1,2,5,4,7],
+    ?line ok = file_sorter:sort(input(L5, 2, Fmt), Foo, Args),
+    ?line true = rev(lists:sort(L5), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+
+    %% Removing duplicate keys.
+    KFun = key_compare(2),
+    L6 = [{5,e},{2,b},{3,c},{1,a},{4,d}] ++ [{2,c},{1,b},{4,a}],
+    KUArgs = lists:keydelete(order, 1, Args) ++ 
+             [{unique, true}, {order, KFun},{size,100000}],
+    ?line ok = file_sorter:sort(input(L6, 2, Fmt), Foo, KUArgs),
+    ?line true = rev(lists:ukeysort(2, L6), KUArgs) =:= from_files(Foo, Fmt),
+    KArgs = lists:keydelete(unique, 1, KUArgs),
+    ?line ok = file_sorter:sort(input(L6, 2, Fmt), Foo, KArgs),
+    ?line true = rev(lists:keysort(2, L6), KArgs) =:= from_files(Foo, Fmt),
+
+    %% Removing duplicate keys. Again.
+    KUArgs2 = lists:keydelete(order, 1, Args) ++ 
+              [{unique, true}, {order, KFun},{size,5}],
+    ?line ok = file_sorter:sort(input(L6, 2, Fmt), Foo, KUArgs2),
+    ?line true = rev(lists:ukeysort(2, L6), KUArgs2) =:= from_files(Foo, Fmt),
+    KArgs2 = lists:keydelete(unique, 1, KUArgs2),
+    ?line ok = file_sorter:sort(input(L6, 2, Fmt), Foo, KArgs2),
+    ?line true = rev(lists:keysort(2, L6), KArgs2) =:= from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    
+    ok.
+
+keysort(Fmt, XArgs, Config) ->
+    Args = make_args(Fmt, [{size,50}, {no_files, 2} | XArgs]),
+    TmpArgs = Args ++ [{tmpdir,?privdir(Config)}],
+    Foo = outfile(foo, Config),
+
+    %% Input is files. Output is a file.
+    ?line ok = file_sorter:keysort(2, [], Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keysort(2, [], Foo, [{unique,true} | Args]),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line L0 = [{a,2},{a,1},{a,2},{a,2},{a,1},{a,2},{a,2},{a,3}],
+    ?line Fs0 = to_files([L0], Fmt, Config),
+    ?line S = rev(lists:ukeysort(1, L0), Args),
+    ?line ok = 
+	file_sorter:keysort(1, Fs0, Foo, Args ++ [{unique,true},
+						  {size,100000}]),
+    ?line S = from_files(Foo, Fmt),
+    ?line ok = 
+	file_sorter:keysort(1, Fs0, Foo, Args ++ [{unique,true},
+						  {size,5}]),
+    ?line S = from_files(Foo, Fmt),
+    ?line ok = file_sorter:keysort(1, Fs0, Foo, Args ++ [{unique,true}]),
+    ?line S = from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs0]),
+    ?line L11 = [{a,1,x4},{b,2,x4},{c,3,x4}],
+    ?line L21 = [{a,1,x3},{b,2,x3},{c,3,x3}],
+    ?line L31 = [{a,1,x2},{b,2,x2},{c,3,x2}],
+    ?line L41 = [{a,1,x1},{b,2,x1},{c,3,x1}],
+    ?line All = [L11, L21, L31, L41],
+    ?line AllFlat = lists:append(All),
+    ?line Sorted = rev(lists:keysort(2, AllFlat), Args),
+    ?line Fs1 = to_files(All, Fmt, Config),
+    ?line ok = file_sorter:keysort(2, Fs1, Foo, Args),
+    ?line Sorted = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+
+    %% Input is files. Output is a fun.
+    ?line [] = file_sorter:keysort(2, [], output([], Fmt), Args),
+    ?line KS1 = file_sorter:keysort(2, Fs1, output([], Fmt), TmpArgs),
+    ?line Sorted = KS1,
+    ?line delete_files(Fs1),
+
+    %% Input is a fun. Output is a file.
+    ?line ok = file_sorter:keysort(2, input([], 2, Fmt), Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keysort(2, input(AllFlat, 4, Fmt), Foo, Args),
+    ?line Sorted = from_files(Foo,  Fmt),
+    ?line delete_files(Foo),
+
+    %% Input is a fun. Output is a fun.
+    ?line [] = file_sorter:keysort(2, input([], 2, Fmt), output([], Fmt),Args),
+    ?line KS2 = 
+	file_sorter:keysort(2, input(AllFlat, 4, Fmt), output([], Fmt), 
+			    TmpArgs),
+    ?line Sorted = KS2,
+    ok.
+
+merge(Fmt, XArgs, Config) ->
+    Args = make_args(Fmt, [{size,5} | XArgs]),
+    Foo = outfile(foo, Config),
+
+    %% Input is a file. Output is a fun.
+    ?line [] = file_sorter:merge([], output([], Fmt), Args),
+    ?line L2 = [[1,3,5],[2,4,5]],
+    ?line Fs1 = to_files(L2, Fmt, Config),
+    ?line S2 = file_sorter:sort(Fs1, output([], Fmt), Args),
+    ?line S2 = rev(lists:sort(lists:append(L2)), Args),
+    ?line delete_files(Fs1),
+
+    %% Input is a file. Output is a file
+    ?line ok = file_sorter:merge([], Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:merge([], Foo, [{unique,true} | Args]),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line L31 = [1,2,3],
+    ?line L32 = [2,3,4],
+    ?line L33 = [4,5,6],
+    ?line L3r = [L31, L32, L33],
+    ?line L3 = [rev(L31,Args), rev(L32,Args), rev(L33,Args)],
+    ?line Fs2 = to_files(L3, Fmt, Config),
+    ?line ok = file_sorter:merge(Fs2, Foo, Args),
+    ?line true = rev(lists:merge(L3r), Args) =:= from_files(Foo, Fmt),
+    ?line ok = file_sorter:merge(Fs2, Foo, Args++[{unique,true}, 
+						  {size,100000}]),
+    ?line true = rev(lists:umerge(L3r), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:merge(Fs2, Foo, Args++[{unique,true}]),
+    ?line true = rev(lists:umerge(L3r), Args) =:= from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs2]),
+
+    ok.
+
+keymerge(Fmt, XArgs, Config) ->
+    Args = make_args(Fmt, [{size,50}, {no_files, 2} | XArgs]),
+    Foo = outfile(foo, Config),
+
+    %% Input is files. Output is a file.
+    ?line ok = file_sorter:keymerge(2, [], Foo, Args),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keymerge(2, [], Foo, [{unique,true} | Args]),
+    ?line [] = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+    ?line L0 = [rev([{a,1},{a,2}], Args), rev([{a,2},{a,1},{a,3}], Args)],
+    ?line Fs0 = to_files(L0, Fmt, Config),
+    ?line delete_files(Foo),
+    ?line ok = file_sorter:keymerge(1, Fs0, Foo, Args ++ [{unique,false}]),
+    ?line S2 = rev([{a,1},{a,2},{a,2},{a,1},{a,3}], Args),
+    ?line S2 = from_files(Foo, Fmt),
+    ?line delete_files([Foo | Fs0]),
+    ?line L11 = [{a,1,x4},{b,2,x4},{c,3,x4}],
+    ?line L21 = [{a,1,x3},{b,2,x3},{c,3,x3}],
+    ?line L31 = [{a,1,x2},{b,2,x2},{c,3,x2}],
+    ?line L41 = [{a,1,x1},{b,2,x1},{c,3,x1}],
+    ?line All = 
+	[rev(L11, Args), rev(L21, Args), rev(L31, Args), rev(L41, Args)],
+    ?line Merged1 = lists:keymerge(2, L11, L21),
+    ?line Merged2 = lists:keymerge(2, L31, L41),
+    ?line Merged = rev(lists:keymerge(2, Merged1, Merged2), Args),
+    ?line Fs1 = to_files(All, Fmt, Config),
+    ?line ok = file_sorter:keymerge(2, Fs1, Foo, Args),
+    ?line Merged = from_files(Foo, Fmt),
+
+    fun() -> 
+    UArgs = [{unique,true} | Args],
+    ?line UMerged1 = lists:ukeymerge(2, L11, L21),
+    ?line UMerged2 = lists:ukeymerge(2, L31, L41),
+    ?line UMerged = rev(lists:ukeymerge(2, UMerged1, UMerged2), Args),
+    ?line ok = file_sorter:keymerge(2, Fs1, Foo, UArgs),
+    ?line UMerged = from_files(Foo, Fmt),
+    UArgs2 = make_args(Fmt, [{unique,true}, {size,50} | XArgs]),
+    ?line ok = file_sorter:keymerge(2, Fs1, Foo, UArgs2),
+    ?line UMerged = from_files(Foo, Fmt),
+    ?line List = rev([{a,1,x4},{b,2,x4},{c,3,x4}], Args),
+    ?line FsL = to_files([List], Fmt, Config),
+    ?line ok = file_sorter:keymerge(2, FsL, Foo, UArgs),
+    ?line List = from_files(Foo, Fmt),
+    ?line List1 = [{a,1,x4},{b,2,x4},{c,3,x4}],
+    ?line List2 = [{a,3,x4},{b,4,x4},{c,5,x4}],
+    ?line FsLL = to_files([rev(List1, Args), rev(List2, Args)], Fmt, Config),
+    ?line ok = file_sorter:keymerge(2, FsLL, Foo, UArgs),
+    ?line List1_2 = rev(lists:ukeymerge(2, List1, List2), Args),
+    ?line List1_2 = from_files(Foo, Fmt),
+    ?line delete_files(Foo)
+    end(),
+
+    %% Input is files. Output is a fun.
+    ?line Fs3 = to_files(All, Fmt, Config),
+    ?line [] = file_sorter:keysort(2, [], output([], Fmt), Args),
+    ?line KS1 = file_sorter:keymerge(2, Fs3, output([], Fmt), Args),
+    ?line Merged = KS1,
+    ?line delete_files([Foo | Fs3]),
+
+    ?line L2 = [[{a,1}],[{a,2}],[{a,3}],[{a,4}],[{a,5}],[{a,6}],[{a,7}]],
+    ?line Fs2 = to_files(L2, Fmt, Config),
+    ?line M = file_sorter:keymerge(1, Fs2, output([], Fmt), Args),
+    ?line M = rev(lists:append(L2), Args),
+    ?line delete_files(Fs2),
+
+    ?line LL1 = [{d,4},{e,5},{f,6}],
+    ?line LL2 = [{a,1},{b,2},{c,3}],
+    ?line LL3 = [{j,10},{k,11},{l,12}],
+    ?line LL4 = [{g,7},{h,8},{i,9}],
+    ?line LL5 = [{p,16},{q,17},{r,18}],
+    ?line LL6 = [{m,13},{n,14},{o,15}],
+    ?line LLAll = [rev(LL1, Args),rev(LL2, Args),rev(LL3, Args),
+                   rev(LL4, Args),rev(LL5, Args),rev(LL6, Args)],
+    ?line FsLL6 = to_files(LLAll, Fmt, Config),
+    ?line LL = rev(lists:sort(lists:append(LLAll)), Args),
+    ?line ok = file_sorter:keymerge(1, FsLL6, Foo, Args),
+    ?line LL = from_files(Foo, Fmt),
+    ?line ok = file_sorter:keymerge(1, FsLL6, Foo, [{unique,true} | Args]),
+    ?line LL = from_files(Foo, Fmt),
+    ?line delete_files([Foo | FsLL6]),
+
+    ok.
+
+funmerge(Fmt, XArgs, Config) ->
+    KComp = key_compare(2),
+    Args = make_args(Fmt, [{order,KComp},{size,5}, {no_files, 5} | XArgs]),
+    UArgs = [{unique,true} | Args],
+    Foo = outfile(foo, Config),
+
+    ?line EFs = to_files([[]], Fmt, Config),
+    ?line ok = file_sorter:merge(EFs, Foo, UArgs),
+    ?line [] = from_files(Foo, Fmt),
+    delete_files([Foo | EFs]),
+
+    ?line L11 = [{a,1,x4},{b,2,x4},{c,3,x4}],
+    ?line L21 = [{a,1,x3},{b,2,x3},{c,3,x3}],
+    ?line L31 = [{a,1,x2},{b,2,x2},{c,3,x2}],
+    ?line L41 = [{a,1,x1},{b,2,x1},{c,3,x1}],
+    ?line CAll = [L11, L21, L31, L41],
+    ?line CMerged1 = lists:merge(KComp, L11, L21),
+    ?line CMerged2 = lists:merge(KComp, L31, L41),
+    ?line CMerged = lists:merge(KComp, CMerged1, CMerged2),
+    ?line CFs1 = to_files(CAll, Fmt, Config),
+    ?line ok = file_sorter:merge(CFs1, Foo, Args),
+    ?line CMerged = from_files(Foo, Fmt),
+
+    Args4 = make_args(Fmt, [{size,50} | XArgs]),
+    ?line ok = file_sorter:merge(CFs1, Foo, [{order,KComp} | Args4]),
+    ?line CMerged = from_files(Foo, Fmt),
+
+    ?line UMerged1 = lists:umerge(KComp, L11, L21),
+    ?line UMerged2 = lists:umerge(KComp, L31, L41),
+    ?line UMerged = lists:umerge(KComp, UMerged1, UMerged2),
+    ?line ok = file_sorter:merge(CFs1, Foo, [{order,KComp} | UArgs]),
+    ?line UMerged = from_files(Foo, Fmt),
+    UArgs2 = 
+        lists:keydelete(order, 1,
+                        make_args(Fmt, [{unique,true}, {size,50} | XArgs])),
+    ?line ok = file_sorter:merge(CFs1, Foo, [{order,KComp} | UArgs2]),
+    ?line UMerged = from_files(Foo, Fmt),
+    ?line delete_files(Foo),
+
+    ?line List1 = [{a,1,x4},{b,2,x4},{c,3,x4}],
+    ?line List2 = [{a,3,x4},{b,4,x4},{c,5,x4}],
+    ?line List3 = [{a,5,x4},{b,6,x4},{c,7,x4}],
+    ?line FsLL = to_files([List1, List2, List3], Fmt, Config),
+    ?line ok = file_sorter:merge(FsLL, Foo, Args),
+    ?line List1_2 = lists:merge(KComp,lists:merge(KComp,List1,List2),List3),
+    ?line List1_2 = from_files(Foo, Fmt),
+    ?line ok = file_sorter:merge(FsLL, Foo, [{order,KComp} | UArgs]),
+    ?line UList1_2 = 
+        lists:umerge(KComp,lists:umerge(KComp, List1, List2),List3),
+    ?line UList1_2 = from_files(Foo, Fmt),
+    ?line delete_files([Foo | CFs1]),
+
+    fun() ->
+    ?line LL1 = [{d,4},{e,5},{f,6}],
+    ?line LL2 = [{a,1},{b,2},{c,3}],
+    ?line LL3 = [{j,10},{k,11},{l,12}],
+    ?line LL4 = [{g,7},{h,8},{i,9}],
+    ?line LL5 = [{p,16},{q,17},{r,18}],
+    ?line LL6 = [{m,13},{n,14},{o,15}],
+    ?line LLAll = [LL1,LL2,LL3,LL4,LL5,LL6],
+    ?line FsLL6 = to_files(LLAll, Fmt, Config),
+    ?line LL = lists:sort(lists:append(LLAll)),
+    ?line ok = file_sorter:merge(FsLL6, Foo, Args),
+    ?line LL = from_files(Foo, Fmt),
+    ?line ok = file_sorter:merge(FsLL6, Foo, UArgs),
+    ?line LL = from_files(Foo, Fmt),
+    ?line delete_files([Foo | FsLL6])
+    end(),
+
+    fun() ->
+    ?line RLL1 = [{b,2},{h,8},{n,14}],
+    ?line RLL2 = [{a,1},{g,7},{m,13}],
+    ?line RLL3 = [{d,4},{j,10},{p,16}],
+    ?line RLL4 = [{c,3},{i,9},{o,15}],
+    ?line RLL5 = [{f,6},{l,12},{r,18}],
+    ?line RLL6 = [{e,5},{k,11},{q,17}],
+    ?line RLLAll = [RLL1,RLL2,RLL3,RLL4,RLL5,RLL6],
+    ?line RFsLL6 = to_files(RLLAll, Fmt, Config),
+    ?line RLL = lists:sort(lists:append(RLLAll)),
+    ?line ok = file_sorter:merge(RFsLL6, Foo, Args),
+    ?line RLL = from_files(Foo, Fmt),
+    ?line ok = file_sorter:merge(RFsLL6, Foo, UArgs),
+    ?line RLL = from_files(Foo, Fmt),
+    ?line delete_files([Foo | RFsLL6])
+    end(),
+
+    ok.
+
+check(Fmt, Config) ->
+    Args0 = make_args(Fmt, [{size,5}]),
+    Args = Args0 ++ [{tmpdir,?privdir(Config)}],
+
+    Fun = fun compare/2,
+
+    L1 = [3,1,2,5,4],
+    [F1_0] = Fs1 = to_files([L1], Fmt, Config),
+    F1 = filename:absname(F1_0),
+    ?line {ok, [{F1,2,1}]} = file_sorter:check(Fs1, Args),
+    ?line {ok, [{F1,2,1}]} = file_sorter:check(Fs1, [{order,Fun} | Args]),
+    ?line {ok, [{F1,2,1}]} = file_sorter:check(Fs1, [{unique,true} | Args]),
+    ?line {ok, [{F1,2,1}]} = 
+	file_sorter:check(Fs1, [{order,Fun},{unique,true} | Args]),
+    ?line {ok, [{F1,3,2}]} = 
+	file_sorter:check(Fs1, [{order,descending} | Args]),
+    ?line {ok, [{F1,3,2}]} = 
+	file_sorter:check(Fs1, [{unique,true},{order,descending} | Args]),
+    ?line delete_files(Fs1),
+    
+    L2 = [[1,2,2,3,3,4,5,5],[5,5,4,3,3,2,2,1]],
+    [F2_0,F3_0] = Fs2 = to_files(L2, Fmt, Config),
+    F2 = filename:absname(F2_0),
+    F3 = filename:absname(F3_0),
+    ?line {ok, [{F3,3,4}]} = file_sorter:check(Fs2, Args),
+    ?line {ok, [{F3,3,4}]} = file_sorter:check(Fs2, [{order,Fun} | Args]),
+    ?line {ok, [{F2,3,2},{F3,2,5}]} = 
+	file_sorter:check(Fs2, [{unique, true} | Args]),
+    ?line {ok, [{F2,3,2},{F3,2,5}]} = 
+	file_sorter:check(Fs2, [{order,Fun},{unique, true} | Args]),
+    ?line {ok, [{F2,2,2}]} = 
+	file_sorter:check(Fs2, [{order,descending} | Args]),
+    ?line {ok, [{F2,2,2},{F3,2,5}]} = 
+	file_sorter:check(Fs2, [{unique,true},{order,descending} | Args]),
+    ?line delete_files(Fs2),
+    
+    L3 = [1,2,3,4],
+    ?line Fs3 = to_files([L3], Fmt, Config),
+    ?line {ok, []} = file_sorter:check(Fs3, [{unique,true} | Args]),
+    ?line {ok, []} = 
+	file_sorter:check(Fs3, [{unique,true},{order,Fun} | Args]),
+    ?line delete_files(Fs3),
+
+    %% big objects
+    ?line T1 = erlang:make_tuple(10000,foo),
+    ?line T2 = erlang:make_tuple(10000,bar),
+    ?line L4 = [T1,T2],
+    ?line [FF_0] = Fs4 = to_files([L4], Fmt, Config),
+    FF = filename:absname(FF_0),
+    ?line {ok, [{FF,2,T2}]} = file_sorter:check(Fs4, [{unique,true} | Args]),
+    ?line delete_files(Fs4),
+
+    CFun = key_compare(2),
+    L10 = [[{1,a},{2,b},T10_1={1,b},{3,c}], [{1,b},T10_2={2,a}]],
+    [F10_0,F11_0] = Fs10 = to_files(L10, Fmt, Config),
+    F10_1 = filename:absname(F10_0),
+    F11_1 = filename:absname(F11_0),
+    ?line {ok, [{F10_1,3,T10_1},{F11_1,2,T10_2}]} = 
+        file_sorter:check(Fs10, [{unique,true},{order,CFun} | Args]),
+    ?line delete_files(Fs10),
+
+    ok.
+
+keycheck(Fmt, Config) ->
+    Args0 = make_args(Fmt, [{size,5}]),
+    Args = Args0 ++ [{tmpdir,?privdir(Config)}],
+
+    ?line L1 = [[{a,1},{b,2}], [{c,2},{b,1},{a,3}]],
+    ?line [F1_0,F2_0] = Fs1 = to_files(L1, Fmt, Config),
+    F1 = filename:absname(F1_0),
+    F2 = filename:absname(F2_0),
+    ?line {ok, [{F2,2,{b,1}}]} = file_sorter:keycheck(1, Fs1, Args),
+    ?line {ok, [{F2,2,{b,1}}]} = 
+	file_sorter:keycheck(1, Fs1, [{unique,true} | Args]),
+    ?line {ok, [{F1,2,{b,2}}]} = 
+	file_sorter:keycheck(1, Fs1, [{order,descending},{unique,true} | Args]),
+    ?line delete_files(Fs1),
+    
+    L2 = [[{a,1},{a,2},{a,2},{b,2}], [{c,2},{b,1},{b,2},{b,2},{a,3}]],
+    ?line [F3_0,F4_0] = Fs2 = to_files(L2, Fmt, Config),
+    F3 = filename:absname(F3_0),
+    F4 = filename:absname(F4_0),
+    ?line {ok, [{F4,2,{b,1}}]} = file_sorter:keycheck(1, Fs2, Args),
+    ?line {ok, [{F3,2,{a,2}},{F4,2,{b,1}}]} = 
+	file_sorter:keycheck(1, Fs2, [{unique,true} | Args]),
+    ?line {ok, [{F3,4,{b,2}}]} = 
+	file_sorter:keycheck(1, Fs2, [{order,descending} | Args]),
+    ?line {ok, [{F3,2,{a,2}},{F4,3,{b,2}}]} = 
+	file_sorter:keycheck(1, Fs2, 
+			     [{order,descending},{unique,true} | Args]),
+    ?line delete_files(Fs2),
+    
+    ok.
+
+rev(L, Args) ->
+    case lists:member({order, descending}, Args) of
+	true ->
+	    lists:reverse(L);
+	false ->
+	    L
+    end.
+
+make_args({HL, Fmt}, Args) ->
+    make_args(Fmt, [{header, HL} | Args]);
+make_args(Fmt, Args) ->
+    [{format, Fmt} | Args].
+
+compare(X, Y) ->
+    X =< Y.
+
+key_compare(I) ->
+    fun(X, Y) -> 
+            element(I, bin_to_term(X)) =< element(I, bin_to_term(Y))
+    end.
+
+bin_to_term(B) when is_binary(B) -> binary_to_term(B);
+bin_to_term(T) -> T.
+
+-define(CHUNKSIZE, 8096).
+
+pps() ->
+    erlang:ports().
+
+input(L, N, term) ->
+    input(L, N);
+input(L, N, {_HL, Format}) when Format =:= binary_term; Format =:= binary ->
+    binput(L, N);
+input(L, N, Format) when Format =:= binary_term; Format =:= binary ->
+    binput(L, N).
+
+binput(L, N) ->
+    Bs = lists:map(fun(T) -> term_to_binary(T) end, L),
+    input(Bs, N).
+
+input(L, N) ->
+    fun(close) ->
+	    ok;
+       (read) ->
+	    case L of
+		[] -> end_of_input;
+		_ ->
+		    R = lists:sublist(L, N),
+		    NL = lists:nthtail(length(R), L),
+		    {R, input(NL, N)}
+	    end
+    end.
+
+output(L, term) ->
+    output(L);
+output(L, {_HL, Format}) when Format =:= binary_term; Format =:= binary ->
+    boutput(L);
+output(L, Format) when Format =:= binary_term; Format =:= binary ->
+    boutput(L).
+
+output(A) ->
+    fun(close) -> 
+	    lists:append(lists:reverse(A));
+       (L) when is_list(L) ->
+	    output([L | A])
+    end.
+
+boutput(A) ->
+    fun(close) -> 
+	    Bs = lists:append(lists:reverse(A)),
+	    lists:map(fun(B) -> binary_to_term(B) end, Bs);
+       (L) when is_list(L) ->
+	    boutput([L | A])
+    end.
+
+outfile(Name, Config) ->
+    list_to_atom(filename:join(?privdir(Config), Name)).
+
+%% [[term()]] -> [filename()]
+to_files(Lists, term, Config) ->
+    terms_to_files(Lists, Config);
+to_files(Lists, Format, Config) when Format =:= binary_term; 
+				     Format =:= binary ->
+    bins_to_files(Lists, 4, Config);
+to_files(Lists, {HL, Format}, Config) when Format =:= binary_term; 
+					   Format =:= binary ->
+    bins_to_files(Lists, HL, Config).
+
+%% [[term()]] -> [filename()]
+terms_to_files(Lists, Config) ->
+    PrivDir = ?privdir(Config),
+    terms_to_files(Lists, PrivDir, 1).
+
+terms_to_files([L | Ls], PrivDir, N) ->
+    F = lists:concat([?MODULE, '_', N]),
+    File = filename:join(PrivDir, F),
+    {ok, Fd} = file:open(File, [write]),
+    write_terms(Fd, L),
+    file:close(Fd),
+    [list_to_atom(File) | terms_to_files(Ls, PrivDir, N+1)];
+terms_to_files([], _PrivDir, _N) ->
+    [].
+
+write_terms(Fd, [T | Ts]) ->
+    io:format(Fd, "~p.~n", [T]),
+    write_terms(Fd, Ts);
+write_terms(_Fd, []) ->
+    ok.
+
+%% [[term()]] -> [filename()]
+bins_to_files(Lists, HL, Config) ->
+    PrivDir = ?privdir(Config),
+    bins_to_files(Lists, PrivDir, 1, HL).
+
+bins_to_files([L | Fs], PrivDir, N, HL) ->
+    F = lists:concat([?MODULE, '_', N]),
+    File = filename:join(PrivDir, F),
+    {ok, Fd} = file:open(File, [raw,binary,write]),
+    write_bins(Fd, L, HL),
+    file:close(Fd),
+    [list_to_atom(File) | bins_to_files(Fs, PrivDir, N+1, HL)];
+bins_to_files([], _PrivDir, _N, _HL) ->
+    [].
+
+write_bins(Fd, [T | Ts], HL) ->
+    B = term_to_binary(T),
+    Sz = byte_size(B),
+    ok = file:write(Fd, [<<Sz:HL/unit:8>>, B]),
+    write_bins(Fd, Ts, HL);
+write_bins(_Fd, [], _HL) ->
+    ok.
+
+%% [filename()] -> [[term()]] or filename() -> [term()]
+from_files(Files, term) ->
+    terms_from_files(Files);
+from_files(Files, Format) when Format =:= binary_term; Format =:= binary ->
+    bins_from_files(Files, 4);
+from_files(Files, {HL, Format}) when Format =:= binary_term; 
+                                     Format =:= binary ->
+    bins_from_files(Files, HL).
+
+%% [filename()] -> [[term()]] or filename() -> [term()]
+terms_from_files(File) when is_atom(File) ->
+    [Terms] = terms_from_files([File]),
+    Terms;
+terms_from_files(Files) ->
+    lists:map(fun(F) -> terms_from_file(F) end, Files).
+
+terms_from_file(File) ->
+    {ok, Fd} = file:open(File, [read,compressed]),
+    terms_from_file(Fd, []).
+
+terms_from_file(Fd, L) ->
+    case io:read(Fd, '') of
+	{ok, Term} ->
+	    terms_from_file(Fd, [Term | L]);
+	eof ->
+	    file:close(Fd),
+	    lists:reverse(L)
+    end.
+
+%% [filename()] -> [[term()]]
+bins_from_files(File, HL) when is_atom(File) ->
+    [Bins] = bins_from_files([File], HL),
+    Bins;
+bins_from_files(Files, HL) ->
+    lists:map(fun(F) -> collect(F, HL) end, Files).
+
+delete_files(File) when is_atom(File) ->
+    file:delete(File);
+delete_files(Files) ->
+    lists:foreach(fun(F) -> file:delete(F) end, Files).
+
+%%%
+%%% Collects binaries converted to terms in a list. Not very efficient.
+%%%
+collect(F, HL) ->
+    {ok, Fd} = file:open(F, [read, binary, raw, compressed]),
+    R = (catch c(Fd, <<>>, 0, ?CHUNKSIZE, HL, [])),
+    file:close(Fd),
+    R.
+
+c(Fd, Bin0, Size0, NoBytes, HL, L) ->
+    case file:read(Fd, NoBytes) of
+	{ok, Bin} ->
+	    Size = Size0 + byte_size(Bin),
+	    NBin = list_to_binary([Bin0, Bin]),
+	    c1(Fd, NBin, Size, HL, L);
+	eof when Size0 =:= 0 ->
+	    lists:reverse(L);
+        eof ->
+	    test_server:fail({error, premature_eof});
+	Error ->
+	    test_server:fail(Error)
+    end.
+
+c1(Fd, B, BinSize, HL, L) -> 
+    case B of 
+	<<Size:HL/unit:8, Bin/binary>> ->
+	    if 
+		Size > BinSize - HL, Size > ?CHUNKSIZE ->
+		    c(Fd, B, BinSize, Size + HL, HL, L);
+		Size > BinSize - HL ->
+		    c(Fd, B, BinSize, ?CHUNKSIZE, HL, L);
+		true ->
+		    <<BinTerm:Size/binary, R/binary>> = Bin,	    
+		    E = case catch binary_to_term(BinTerm) of
+                            {'EXIT', _} ->
+				test_server:fail({error, bad_object});
+			    Term ->
+				Term
+			end,
+		    NBinSize = BinSize - HL - Size,
+		    c1(Fd, R, NBinSize, HL, [E | L])
+	    end;
+	_ ->
+	    c(Fd, B, BinSize, ?CHUNKSIZE, HL, L)
+    end.