//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <__assert>
#include <__config>
#include <errno.h>
#include <filesystem>
#include <stack>
#include <utility>
#include "error.h"
#include "file_descriptor.h"
#if defined(_LIBCPP_WIN32API)
# define WIN32_LEAN_AND_MEAN
# define NOMINMAX
# include <windows.h>
#else
# include <dirent.h> // for DIR & friends
#endif
_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
using detail::ErrorHandler;
#if defined(_LIBCPP_WIN32API)
class __dir_stream {
public:
__dir_stream() = delete;
__dir_stream& operator=(const __dir_stream&) = delete;
__dir_stream(__dir_stream&& __ds) noexcept
: __stream_(__ds.__stream_), __root_(std::move(__ds.__root_)), __entry_(std::move(__ds.__entry_)) {
__ds.__stream_ = INVALID_HANDLE_VALUE;
}
__dir_stream(const path& root, directory_options opts, error_code& ec)
: __stream_(INVALID_HANDLE_VALUE), __root_(root) {
if (root.native().empty()) {
ec = make_error_code(errc::no_such_file_or_directory);
return;
}
__stream_ = ::FindFirstFileW((root / "*").c_str(), &__data_);
if (__stream_ == INVALID_HANDLE_VALUE) {
ec = detail::make_windows_error(GetLastError());
const bool ignore_permission_denied = bool(opts & directory_options::skip_permission_denied);
if (ignore_permission_denied && ec.value() == static_cast<int>(errc::permission_denied))
ec.clear();
return;
}
if (!assign())
advance(ec);
}
~__dir_stream() noexcept {
if (__stream_ == INVALID_HANDLE_VALUE)
return;
close();
}
bool good() const noexcept { return __stream_ != INVALID_HANDLE_VALUE; }
bool advance(error_code& ec) {
while (::FindNextFileW(__stream_, &__data_)) {
if (assign())
return true;
}
close();
return false;
}
bool assign() {
if (!wcscmp(__data_.cFileName, L".") || !wcscmp(__data_.cFileName, L".."))
return false;
__entry_.__assign_iter_entry(
__root_ / __data_.cFileName,
directory_entry::__create_iter_cached_result(
detail::get_file_type(__data_),
detail::get_file_size(__data_),
detail::get_file_perm(__data_),
detail::get_write_time(__data_)));
return true;
}
private:
error_code close() noexcept {
error_code ec;
if (!::FindClose(__stream_))
ec = detail::make_windows_error(GetLastError());
__stream_ = INVALID_HANDLE_VALUE;
return ec;
}
HANDLE __stream_{INVALID_HANDLE_VALUE};
WIN32_FIND_DATAW __data_;
public:
path __root_;
directory_entry __entry_;
};
#else
class __dir_stream {
public:
__dir_stream() = delete;
__dir_stream& operator=(const __dir_stream&) = delete;
__dir_stream(__dir_stream&& other) noexcept
: __stream_(other.__stream_), __root_(std::move(other.__root_)), __entry_(std::move(other.__entry_)) {
other.__stream_ = nullptr;
}
__dir_stream(const path& root, directory_options opts, error_code& ec) : __stream_(nullptr), __root_(root) {
if ((__stream_ = ::opendir(root.c_str())) == nullptr) {
ec = detail::capture_errno();
const bool allow_eacces = bool(opts & directory_options::skip_permission_denied);
if (allow_eacces && ec.value() == EACCES)
ec.clear();
return;
}
advance(ec);
}
~__dir_stream() noexcept {
if (__stream_)
close();
}
bool good() const noexcept { return __stream_ != nullptr; }
bool advance(error_code& ec) {
while (true) {
auto str_type_pair = detail::posix_readdir(__stream_, ec);
auto& str = str_type_pair.first;
if (str == "." || str == "..") {
continue;
} else if (ec || str.empty()) {
close();
return false;
} else {
__entry_.__assign_iter_entry(__root_ / str, directory_entry::__create_iter_result(str_type_pair.second));
return true;
}
}
}
private:
error_code close() noexcept {
error_code m_ec;
if (::closedir(__stream_) == -1)
m_ec = detail::capture_errno();
__stream_ = nullptr;
return m_ec;
}
DIR* __stream_{nullptr};
public:
path __root_;
directory_entry __entry_;
};
#endif
// directory_iterator
directory_iterator::directory_iterator(const path& p, error_code* ec, directory_options opts) {
ErrorHandler<void> err("directory_iterator::directory_iterator(...)", ec, &p);
error_code m_ec;
__imp_ = make_shared<__dir_stream>(p, opts, m_ec);
if (ec)
*ec = m_ec;
if (!__imp_->good()) {
__imp_.reset();
if (m_ec)
err.report(m_ec);
}
}
directory_iterator& directory_iterator::__increment(error_code* ec) {
_LIBCPP_ASSERT_NON_NULL(__imp_ != nullptr, "Attempting to increment an invalid iterator");
ErrorHandler<void> err("directory_iterator::operator++()", ec);
error_code m_ec;
if (!__imp_->advance(m_ec)) {
path root = std::move(__imp_->__root_);
__imp_.reset();
if (m_ec)
err.report(m_ec, "at root " PATH_CSTR_FMT, root.c_str());
}
return *this;
}
directory_entry const& directory_iterator::__dereference() const {
_LIBCPP_ASSERT_NON_NULL(__imp_ != nullptr, "Attempting to dereference an invalid iterator");
return __imp_->__entry_;
}
// recursive_directory_iterator
struct recursive_directory_iterator::__shared_imp {
stack<__dir_stream> __stack_;
directory_options __options_;
};
recursive_directory_iterator::recursive_directory_iterator(const path& p, directory_options opt, error_code* ec)
: __imp_(nullptr), __rec_(true) {
ErrorHandler<void> err("recursive_directory_iterator", ec, &p);
error_code m_ec;
__dir_stream new_s(p, opt, m_ec);
if (m_ec)
err.report(m_ec);
if (m_ec || !new_s.good())
return;
__imp_ = make_shared<__shared_imp>();
__imp_->__options_ = opt;
__imp_->__stack_.push(std::move(new_s));
}
void recursive_directory_iterator::__pop(error_code* ec) {
_LIBCPP_ASSERT_NON_NULL(__imp_ != nullptr, "Popping the end iterator");
if (ec)
ec->clear();
__imp_->__stack_.pop();
if (__imp_->__stack_.size() == 0)
__imp_.reset();
else
__advance(ec);
}
directory_options recursive_directory_iterator::options() const { return __imp_->__options_; }
int recursive_directory_iterator::depth() const { return __imp_->__stack_.size() - 1; }
const directory_entry& recursive_directory_iterator::__dereference() const { return __imp_->__stack_.top().__entry_; }
recursive_directory_iterator& recursive_directory_iterator::__increment(error_code* ec) {
if (ec)
ec->clear();
if (recursion_pending()) {
if (__try_recursion(ec) || (ec && *ec))
return *this;
}
__rec_ = true;
__advance(ec);
return *this;
}
void recursive_directory_iterator::__advance(error_code* ec) {
ErrorHandler<void> err("recursive_directory_iterator::operator++()", ec);
const directory_iterator end_it;
auto& stack = __imp_->__stack_;
error_code m_ec;
while (stack.size() > 0) {
if (stack.top().advance(m_ec))
return;
if (m_ec)
break;
stack.pop();
}
if (m_ec) {
path root = std::move(stack.top().__root_);
__imp_.reset();
err.report(m_ec, "at root " PATH_CSTR_FMT, root.c_str());
} else {
__imp_.reset();
}
}
bool recursive_directory_iterator::__try_recursion(error_code* ec) {
ErrorHandler<void> err("recursive_directory_iterator::operator++()", ec);
bool rec_sym = bool(options() & directory_options::follow_directory_symlink);
auto& curr_it = __imp_->__stack_.top();
bool skip_rec = false;
error_code m_ec;
if (!rec_sym) {
file_status st(curr_it.__entry_.__get_sym_ft(&m_ec));
if (m_ec && status_known(st))
m_ec.clear();
if (m_ec || is_symlink(st) || !is_directory(st))
skip_rec = true;
} else {
file_status st(curr_it.__entry_.__get_ft(&m_ec));
if (m_ec && status_known(st))
m_ec.clear();
if (m_ec || !is_directory(st))
skip_rec = true;
}
if (!skip_rec) {
__dir_stream new_it(curr_it.__entry_.path(), __imp_->__options_, m_ec);
if (new_it.good()) {
__imp_->__stack_.push(std::move(new_it));
return true;
}
}
if (m_ec) {
const bool allow_eacess = bool(__imp_->__options_ & directory_options::skip_permission_denied);
if (m_ec.value() == EACCES && allow_eacess) {
if (ec)
ec->clear();
} else {
path at_ent = std::move(curr_it.__entry_.__p_);
__imp_.reset();
err.report(m_ec, "attempting recursion into " PATH_CSTR_FMT, at_ent.c_str());
}
}
return false;
}
_LIBCPP_END_NAMESPACE_FILESYSTEM
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