61 lines
1.8 KiB
Erlang
61 lines
1.8 KiB
Erlang
%% Vendored from hex_core v0.7.1, do not edit manually
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% @private
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% Excerpt from https://github.com/erlang/otp/blob/OTP-20.0.1/lib/stdlib/src/filename.erl#L761-L788
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% with modifications for changing local function calls to remote function calls
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% to the `filename` module, for the functions `pathtype/1`, `split/1`, and `join/1`
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%
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% safe_relative_path/1 was not present in earlier OTP releases.
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%%
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%% %CopyrightBegin%
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%%
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%% Copyright Ericsson AB 1997-2017. All Rights Reserved.
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%%
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%% Licensed under the Apache License, Version 2.0 (the "License");
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%% you may not use this file except in compliance with the License.
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%% You may obtain a copy of the License at
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%%
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%% http://www.apache.org/licenses/LICENSE-2.0
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%%
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%% Unless required by applicable law or agreed to in writing, software
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%% distributed under the License is distributed on an "AS IS" BASIS,
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%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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%% See the License for the specific language governing permissions and
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%% limitations under the License.
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%%
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%% %CopyrightEnd%
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%%
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-module(r3_hex_filename).
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-export([safe_relative_path/1]).
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safe_relative_path(Path) ->
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case filename:pathtype(Path) of
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relative ->
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Cs0 = filename:split(Path),
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safe_relative_path_1(Cs0, []);
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_ ->
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unsafe
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end.
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safe_relative_path_1(["."|T], Acc) ->
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safe_relative_path_1(T, Acc);
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safe_relative_path_1([<<".">>|T], Acc) ->
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safe_relative_path_1(T, Acc);
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safe_relative_path_1([".."|T], Acc) ->
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climb(T, Acc);
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safe_relative_path_1([<<"..">>|T], Acc) ->
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climb(T, Acc);
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safe_relative_path_1([H|T], Acc) ->
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safe_relative_path_1(T, [H|Acc]);
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safe_relative_path_1([], []) ->
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[];
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safe_relative_path_1([], Acc) ->
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filename:join(lists:reverse(Acc)).
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climb(_, []) ->
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unsafe;
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climb(T, [_|Acc]) ->
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safe_relative_path_1(T, Acc).
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