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127 lines
3.9 KiB
127 lines
3.9 KiB
/*
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* Copyright (C) 2019 The Android Open Source Project
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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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#pragma once
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#include <iterator>
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#include <optional>
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#include <string>
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#include <string_view>
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#include <dirent.h>
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namespace android::incfs::path {
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namespace details {
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void appendNextPath(std::string& res, std::string_view c);
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}
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std::string fromFd(int fd);
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bool isAbsolute(std::string_view path);
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std::string normalize(std::string_view path);
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std::string_view relativize(std::string_view parent, std::string_view nested);
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inline std::string_view relativize(const char* parent, const char* nested) {
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return relativize(std::string_view(parent), std::string_view(nested));
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}
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inline std::string_view relativize(std::string_view parent, const char* nested) {
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return relativize(parent, std::string_view(nested));
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}
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inline std::string_view relativize(const char* parent, std::string_view nested) {
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return relativize(std::string_view(parent), nested);
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}
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std::string_view relativize(std::string&& parent, std::string_view nested) = delete;
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std::string_view relativize(std::string_view parent, std::string&& nested) = delete;
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// Note: some system headers #define 'dirname' and 'basename' as macros
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inline std::string_view baseName(std::string_view path) {
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using namespace std::literals;
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if (path.empty()) {
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return {};
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}
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if (path == "/"sv) {
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return "/"sv;
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}
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auto pos = path.rfind('/');
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while (!path.empty() && pos == path.size() - 1) {
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path.remove_suffix(1);
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pos = path.rfind('/');
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}
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if (pos == path.npos) {
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return path.empty() ? "/"sv : path;
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}
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return path.substr(pos + 1);
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}
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inline std::string_view dirName(std::string_view path) {
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using namespace std::literals;
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if (path.empty()) {
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return {};
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}
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if (path == "/"sv) {
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return "/"sv;
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}
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const auto pos = path.rfind('/');
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if (pos == 0) {
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return "/"sv;
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}
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if (pos == path.npos) {
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return "."sv;
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}
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return path.substr(0, pos);
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}
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// Split the |full| path into its directory and basename components.
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// This modifies the input string to null-terminate the output directory
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std::pair<std::string_view, std::string_view> splitDirBase(std::string& full);
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int isEmptyDir(std::string_view dir);
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bool startsWith(std::string_view path, std::string_view prefix);
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bool endsWith(std::string_view path, std::string_view prefix);
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inline auto openDir(const char* path) {
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struct closer {
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void operator()(DIR* d) const { ::closedir(d); }
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};
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auto dir = std::unique_ptr<DIR, closer>(::opendir(path));
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return dir;
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}
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template <class... Paths>
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std::string join(std::string&& first, std::string_view second, Paths&&... paths) {
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std::string& result = first;
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{
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using std::size;
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result.reserve(first.size() + second.size() + 1 + (sizeof...(paths) + ... + size(paths)));
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}
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(details::appendNextPath(result, second), ...,
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details::appendNextPath(result, std::forward<Paths>(paths)));
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return result;
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}
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template <class... Paths>
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std::string join(std::string_view first, std::string_view second, Paths&&... paths) {
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return join(std::string(), first, second, std::forward<Paths>(paths)...);
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}
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template <class... Paths>
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std::string join(const char* first, std::string_view second, Paths&&... paths) {
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return path::join(std::string_view(first), second, std::forward<Paths>(paths)...);
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}
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} // namespace android::incfs::path
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