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-rw-r--r--lib/stdlib/src/filename.erl70
1 files changed, 70 insertions, 0 deletions
diff --git a/lib/stdlib/src/filename.erl b/lib/stdlib/src/filename.erl
index 9bf4290916..1c3ab6d274 100644
--- a/lib/stdlib/src/filename.erl
+++ b/lib/stdlib/src/filename.erl
@@ -41,6 +41,7 @@
safe_relative_path/1]).
-export([find_src/1, find_src/2]). % deprecated
-export([basedir/2, basedir/3]).
+-export([validate/1]).
%% Undocumented and unsupported exports.
-export([append/2]).
@@ -1135,3 +1136,72 @@ basedir_os_type() ->
{win32,_} -> windows;
_ -> linux
end.
+
+%%
+%% validate/1
+%%
+
+-spec validate(FileName) -> boolean() when
+ FileName :: file:name_all().
+
+validate(FileName) when is_binary(FileName) ->
+ %% Raw filename...
+ validate_bin(FileName);
+validate(FileName) when is_list(FileName);
+ is_atom(FileName) ->
+ validate_list(FileName,
+ file:native_name_encoding(),
+ os:type()).
+
+validate_list(FileName, Enc, Os) ->
+ try
+ true = validate_list(FileName, Enc, Os, 0) > 0
+ catch
+ _ : _ -> false
+ end.
+
+validate_list([], _Enc, _Os, Chars) ->
+ Chars;
+validate_list(C, Enc, Os, Chars) when is_integer(C) ->
+ validate_char(C, Enc, Os),
+ Chars+1;
+validate_list(A, Enc, Os, Chars) when is_atom(A) ->
+ validate_list(atom_to_list(A), Enc, Os, Chars);
+validate_list([H|T], Enc, Os, Chars) ->
+ NewChars = validate_list(H, Enc, Os, Chars),
+ validate_list(T, Enc, Os, NewChars).
+
+%% C is always an integer...
+% validate_char(C, _, _) when not is_integer(C) ->
+% throw(invalid);
+validate_char(C, _, _) when C < 1 ->
+ throw(invalid); %% No negative or null characters...
+validate_char(C, latin1, _) when C > 255 ->
+ throw(invalid);
+validate_char(C, utf8, _) when C >= 16#110000 ->
+ throw(invalid);
+validate_char(C, utf8, {win32, _}) when C > 16#ffff ->
+ throw(invalid); %% invalid win wchar...
+validate_char(_C, utf8, {win32, _}) ->
+ ok; %% Range below is accepted on windows...
+validate_char(C, utf8, _) when 16#D800 =< C, C =< 16#DFFF ->
+ throw(invalid); %% invalid unicode range...
+validate_char(_, _, _) ->
+ ok.
+
+validate_bin(Bin) ->
+ %% Raw filename. That is, we do not interpret
+ %% the encoding, but we still do not accept
+ %% null characters...
+ try
+ true = validate_bin(Bin, 0) > 0
+ catch
+ _ : _ -> false
+ end.
+
+validate_bin(<<>>, Bs) ->
+ Bs;
+validate_bin(<<0, _Rest/binary>>, _Bs) ->
+ throw(invalid); %% No null characters allowed...
+validate_bin(<<_B, Rest/binary>>, Bs) ->
+ validate_bin(Rest, Bs+1).