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/*
* Copyright (C) 2024 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <algorithm>
#include <iterator>
#include <string>
namespace util {
namespace internal {
const char SEP = '/';
std::string DeduplicateAndTrimSeparators(const std::string& path) {
bool lastWasSep = false;
std::string ret;
std::copy_if(path.begin(), path.end(), std::back_inserter(ret), [&lastWasSep](char c) {
if (lastWasSep) {
if (c == SEP) return false;
lastWasSep = false;
} else if (c == SEP) {
lastWasSep = true;
}
return true;
});
if (ret.length() > 1 && ret.back() == SEP) ret.pop_back();
return ret;
}
} // namespace internal
unsigned int GetCgroupDepth(const std::string& controller_root, const std::string& cgroup_path) {
const std::string deduped_root = internal::DeduplicateAndTrimSeparators(controller_root);
const std::string deduped_path = internal::DeduplicateAndTrimSeparators(cgroup_path);
if (deduped_root.empty() || deduped_path.empty() || !deduped_path.starts_with(deduped_root))
return 0;
return std::count(deduped_path.begin() + deduped_root.size(), deduped_path.end(),
internal::SEP);
}
} // namespace util
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