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#include "experimental/filesystem"
#include <dirent.h>
#include <errno.h>
_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_FILESYSTEM
namespace { namespace detail {
inline error_code capture_errno() {
_LIBCPP_ASSERT(errno, "Expected errno to be non-zero");
return error_code{errno, std::generic_category()};
}
template <class ...Args>
inline bool capture_error_or_throw(std::error_code* user_ec,
const char* msg, Args&&... args)
{
std::error_code my_ec = capture_errno();
if (user_ec) {
*user_ec = my_ec;
return true;
}
__throw_filesystem_error(msg, std::forward<Args>(args)..., my_ec);
return false;
}
template <class ...Args>
inline bool set_or_throw(std::error_code& my_ec,
std::error_code* user_ec,
const char* msg, Args&&... args)
{
if (user_ec) {
*user_ec = my_ec;
return true;
}
__throw_filesystem_error(msg, std::forward<Args>(args)..., my_ec);
return false;
}
typedef path::string_type string_type;
inline string_type posix_readdir(DIR *dir_stream, error_code& ec) {
struct dirent* dir_entry_ptr = nullptr;
errno = 0; // zero errno in order to detect errors
if ((dir_entry_ptr = ::readdir(dir_stream)) == nullptr) {
ec = capture_errno();
return {};
} else {
ec.clear();
return dir_entry_ptr->d_name;
}
}
}} // namespace detail
using detail::set_or_throw;
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_eacess =
bool(opts & directory_options::skip_permission_denied);
if (allow_eacess && 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 = detail::posix_readdir(__stream_, ec);
if (str == "." || str == "..") {
continue;
} else if (ec || str.empty()) {
close();
return false;
} else {
__entry_.assign(__root_ / str);
return true;
}
}
}
private:
std::error_code close() noexcept {
std::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_;
};
// directory_iterator
directory_iterator::directory_iterator(const path& p, error_code *ec,
directory_options opts)
{
std::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)
set_or_throw(m_ec, ec,
"directory_iterator::directory_iterator(...)", p);
}
}
directory_iterator& directory_iterator::__increment(error_code *ec)
{
_LIBCPP_ASSERT(__imp_, "Attempting to increment an invalid iterator");
std::error_code m_ec;
if (!__imp_->advance(m_ec)) {
__imp_.reset();
if (m_ec)
set_or_throw(m_ec, ec, "directory_iterator::operator++()");
} else {
if (ec) ec->clear();
}
return *this;
}
directory_entry const& directory_iterator::__deref() const {
_LIBCPP_ASSERT(__imp_, "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)
{
if (ec) ec->clear();
std::error_code m_ec;
__dir_stream new_s(p, opt, m_ec);
if (m_ec) set_or_throw(m_ec, ec, "recursive_directory_iterator", p);
if (m_ec || !new_s.good()) return;
__imp_ = _VSTD::make_shared<__shared_imp>();
__imp_->__options_ = opt;
__imp_->__stack_.push(_VSTD::move(new_s));
}
void recursive_directory_iterator::__pop(error_code* ec)
{
_LIBCPP_ASSERT(__imp_, "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::__deref() 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) {
// REQUIRES: ec must be cleared before calling this function.
const directory_iterator end_it;
auto& stack = __imp_->__stack_;
std::error_code m_ec;
while (stack.size() > 0) {
if (stack.top().advance(m_ec))
return;
if (m_ec) break;
stack.pop();
}
__imp_.reset();
if (m_ec)
set_or_throw(m_ec, ec, "recursive_directory_iterator::operator++()");
}
bool recursive_directory_iterator::__try_recursion(error_code *ec) {
bool rec_sym =
bool(options() & directory_options::follow_directory_symlink);
auto& curr_it = __imp_->__stack_.top();
if (is_directory(curr_it.__entry_.status()) &&
(!is_symlink(curr_it.__entry_.symlink_status()) || rec_sym))
{
std::error_code m_ec;
__dir_stream new_it(curr_it.__entry_.path(), __imp_->__options_, m_ec);
if (new_it.good()) {
__imp_->__stack_.push(_VSTD::move(new_it));
return true;
}
if (m_ec) {
__imp_.reset();
set_or_throw(m_ec, ec,
"recursive_directory_iterator::operator++()");
}
}
return false;
}
_LIBCPP_END_NAMESPACE_EXPERIMENTAL_FILESYSTEM
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