311 lines
7.8 KiB
C++
311 lines
7.8 KiB
C++
/*
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* Copyright (C) 2015 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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#include <utils/Path.h>
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#include <sstream>
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#include <ostream>
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#include <iterator>
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#if defined(WIN32)
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# include <utils/compiler.h>
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# include <utils/win32/stdtypes.h>
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# define SEPARATOR '\\'
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# define SEPARATOR_STR "\\"
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#else
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# include <unistd.h>
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# define SEPARATOR '/'
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# define SEPARATOR_STR "/"
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#endif
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#include <limits.h>
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#include <sys/stat.h>
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namespace utils {
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Path::Path(const char* path)
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: Path(std::string(path)) {
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}
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Path::Path(std::string_view pathname)
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: Path(std::string(pathname)) {
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}
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Path::Path(const std::string& path)
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: m_path(getCanonicalPath(path)) {
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}
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bool Path::exists() const {
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#if defined(_WIN64) || defined(_M_X64)
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struct _stat64 file;
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return _stat64(c_str(), &file) == 0;
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#else
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struct stat file;
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return stat(c_str(), &file) == 0;
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#endif
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}
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bool Path::isFile() const {
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struct stat file;
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if (stat(c_str(), &file) == 0) {
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return S_ISREG(file.st_mode);
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}
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return false;
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}
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bool Path::isDirectory() const {
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struct stat file;
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if (stat(c_str(), &file) == 0) {
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return S_ISDIR(file.st_mode);
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}
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return false;
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}
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Path Path::concat(const Path& path) const {
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if (path.isEmpty()) return *this;
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if (path.isAbsolute()) return path;
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// std::string::back() is UB if the string is empty, so we rely on short-circuit evaluation
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if (!m_path.empty() && m_path.back() != SEPARATOR) {
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return Path(m_path + SEPARATOR + path.getPath());
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}
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return Path(m_path + path.getPath());
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}
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void Path::concatToSelf(const Path& path) {
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if (!path.isEmpty()) {
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if (path.isAbsolute()) {
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m_path = path.getPath();
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// std::string::back() is UB if the string is empty, so we rely on short-circuit evaluation
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} else if (!m_path.empty() && m_path.back() != SEPARATOR) {
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m_path = getCanonicalPath(m_path + SEPARATOR + path.getPath());
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} else {
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m_path = getCanonicalPath(m_path + path.getPath());
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}
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}
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}
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Path Path::concat(const std::string& root, const std::string& leaf) {
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return Path(root).concat(Path(leaf));
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}
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Path Path::getCurrentDirectory() {
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char directory[PATH_MAX + 1];
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if (getcwd(directory, PATH_MAX) == nullptr) {
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return Path();
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}
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return Path(directory);
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}
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Path Path::getAbsolutePath() const {
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if (isEmpty() || isAbsolute()) {
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return *this;
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}
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return getCurrentDirectory().concat(*this);
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}
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#if !defined(WIN32)
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bool Path::isAbsolute() const {
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return !isEmpty() && m_path.front() == '/';
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}
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#endif
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Path Path::getParent() const {
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if (isEmpty()) return "";
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std::string result;
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std::vector<std::string> segments(split());
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// if our path is absolute with a single segment,
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// be sure to keep the prefix component
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if (!isAbsolute() || segments.size() > 1) {
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segments.pop_back(); // peel the last one
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}
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for (auto const& s : segments) {
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result.append(s).append(SEPARATOR_STR);
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}
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return getCanonicalPath(result);
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}
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Path Path::getAncestor(int n) const {
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Path result = getParent();
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while (n--) {
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result = result.getParent();
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}
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return result;
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}
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std::string Path::getName() const {
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if (isEmpty()) return "";
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std::vector<std::string> segments(split());
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return segments.back();
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}
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std::string Path::getExtension() const {
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if (isEmpty() || isDirectory()) {
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return "";
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}
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auto name = getName();
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auto index = name.rfind('.');
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if (index != std::string::npos && index != 0) {
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return name.substr(index + 1);
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} else {
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return "";
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}
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}
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std::string Path::getNameWithoutExtension() const {
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std::string name = getName();
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size_t index = name.rfind('.');
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if (index != std::string::npos) {
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return name.substr(0, index);
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}
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return name;
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}
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std::ostream& operator<<(std::ostream& os, const Path& path) {
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os << path.getPath();
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return os;
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}
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std::vector<std::string> Path::split() const {
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std::vector<std::string> segments;
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if (isEmpty()) return segments;
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size_t current;
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ssize_t next = -1;
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// If there is a leading disk designator such as C:, this naturally becomes the first segment.
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// However if there there is leading slash or back slash, we need to explicitly preserve it.
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// Note that we are guaranteed to have at least one char in the path at this point.
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if (m_path[0] == '/' || m_path[0] == '\\') {
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segments.push_back(m_path.substr(0, 1));
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next = 0;
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}
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do {
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current = size_t(next + 1);
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next = m_path.find_first_of(SEPARATOR, current);
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std::string segment(m_path.substr(current, next - current));
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if (!segment.empty()) segments.push_back(segment);
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} while (next != std::string::npos);
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if (segments.empty()) segments.push_back(m_path);
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return segments;
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}
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std::string Path::getCanonicalPath(const std::string& path) {
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if (path.empty()) return "";
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std::vector<std::string> segments;
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// If the path starts with a / we must preserve it
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bool starts_with_slash = path.front() == SEPARATOR;
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// If the path does not end with a / we need to remove the
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// extra / added by the join process
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bool ends_with_slash = path.back() == SEPARATOR;
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size_t current;
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ssize_t next = -1;
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do {
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current = size_t(next + 1);
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// Handle both Unix and Windows style separators
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next = path.find_first_of("/\\", current);
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std::string segment(path.substr(current, next - current));
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size_t size = segment.length();
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// skip empty (keep initial)
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if (size == 0 && !segments.empty()) {
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continue;
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}
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// skip . (keep initial)
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if (segment == "." && !segments.empty()) {
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continue;
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}
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// remove ..
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if (segment == ".." && !segments.empty()) {
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if (segments.back().empty()) { // ignore if .. follows initial /
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continue;
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}
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if (segments.back() != "..") {
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segments.pop_back();
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continue;
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}
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}
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segments.push_back(segment);
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} while (next != std::string::npos);
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// Join the vector as a single string, every element is
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// separated by a '/'. This process adds an extra / at
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// the end that might need to be removed
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std::stringstream clean_path;
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std::copy(segments.begin(), segments.end(),
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std::ostream_iterator<std::string>(clean_path, SEPARATOR_STR));
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std::string new_path = clean_path.str();
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if (starts_with_slash && new_path.empty()) {
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new_path = SEPARATOR_STR;
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}
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if (!ends_with_slash && new_path.length() > 1) {
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new_path.pop_back();
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}
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return new_path;
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}
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bool Path::mkdirRecursive() const {
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if (isEmpty()) {
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return true;
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}
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errno = 0;
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bool success = mkdir();
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if (!success) {
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int saveErrno = errno;
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switch (saveErrno) {
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case EEXIST: {
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bool result = isDirectory();
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errno = saveErrno;
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return result;
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}
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case ENOENT:
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getParent().mkdirRecursive();
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return mkdir();
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default:
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break;
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}
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}
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return success;
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}
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bool Path::unlinkFile() {
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return ::unlink(m_path.c_str()) == 0;
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}
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} // namespace utils
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