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cosmopolitan/third_party/libcxx/operations.cc
Justine Tunney fa20edc44d
Reduce header complexity 
- Remove most __ASSEMBLER__ __LINKER__ ifdefs
- Rename libc/intrin/bits.h to libc/serialize.h
- Block pthread cancelation in fchmodat() polyfill
- Remove `clang-format off` statements in third_party
2023-11-28 14:39:42 -08:00

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//===--------------------- filesystem/ops.cpp -----------------------------===//
//
// 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 "third_party/libcxx/filesystem"
#include "third_party/libcxx/array"
#include "third_party/libcxx/iterator"
#include "third_party/libcxx/fstream"
#include "third_party/libcxx/random"
#include "third_party/libcxx/string_view"
#include "third_party/libcxx/type_traits"
#include "third_party/libcxx/vector"
#include "third_party/libcxx/cstdlib"
#include "third_party/libcxx/climits"
#include "libc/sysv/consts/s.h"
#include "libc/sock/sock.h"
#include "libc/sysv/consts/o.h"
#include "libc/runtime/pathconf.h"
#include "libc/runtime/pathconf.h"
#include "libc/sysv/consts/utime.h"
#include "libc/calls/struct/statvfs.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/at.h"
#include "libc/sysv/consts/clock.h"
#include "third_party/libcxx/filesystem_common.hh"
#ifdef __COSMOPOLITAN__
#define _LIBCPP_USE_SENDFILE
#elif defined(__linux__)
// MISSING #include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33)
#include "libc/calls/weirdtypes.h"
#include "libc/sock/sock.h"
#define _LIBCPP_USE_SENDFILE
#endif
#elif defined(__APPLE__) || __has_include(<copyfile.h>)
// MISSING #include <copyfile.h>
#define _LIBCPP_USE_COPYFILE
#endif
#if !defined(__APPLE__)
#define _LIBCPP_USE_CLOCK_GETTIME
#endif
#if defined(__unix__) && defined(__ELF__) && defined(_LIBCPP_HAS_COMMENT_LIB_PRAGMA)
#pragma comment(lib, "rt")
#endif
#if defined(_LIBCPP_COMPILER_GCC)
#if _GNUC_VER < 500
#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
#endif
#endif
_LIBCPP_BEGIN_NAMESPACE_FILESYSTEM
namespace {
namespace parser {
using string_view_t = path::__string_view;
using string_view_pair = pair<string_view_t, string_view_t>;
using PosPtr = path::value_type const*;
struct PathParser {
enum ParserState : unsigned char {
// Zero is a special sentinel value used by default constructed iterators.
PS_BeforeBegin = path::iterator::_BeforeBegin,
PS_InRootName = path::iterator::_InRootName,
PS_InRootDir = path::iterator::_InRootDir,
PS_InFilenames = path::iterator::_InFilenames,
PS_InTrailingSep = path::iterator::_InTrailingSep,
PS_AtEnd = path::iterator::_AtEnd
};
const string_view_t Path;
string_view_t RawEntry;
ParserState State;
private:
PathParser(string_view_t P, ParserState State) noexcept : Path(P),
State(State) {}
public:
PathParser(string_view_t P, string_view_t E, unsigned char S)
: Path(P), RawEntry(E), State(static_cast<ParserState>(S)) {
// S cannot be '0' or PS_BeforeBegin.
}
static PathParser CreateBegin(string_view_t P) noexcept {
PathParser PP(P, PS_BeforeBegin);
PP.increment();
return PP;
}
static PathParser CreateEnd(string_view_t P) noexcept {
PathParser PP(P, PS_AtEnd);
return PP;
}
PosPtr peek() const noexcept {
auto TkEnd = getNextTokenStartPos();
auto End = getAfterBack();
return TkEnd == End ? nullptr : TkEnd;
}
void increment() noexcept {
const PosPtr End = getAfterBack();
const PosPtr Start = getNextTokenStartPos();
if (Start == End)
return makeState(PS_AtEnd);
switch (State) {
case PS_BeforeBegin: {
PosPtr TkEnd = consumeSeparator(Start, End);
if (TkEnd)
return makeState(PS_InRootDir, Start, TkEnd);
else
return makeState(PS_InFilenames, Start, consumeName(Start, End));
}
case PS_InRootDir:
return makeState(PS_InFilenames, Start, consumeName(Start, End));
case PS_InFilenames: {
PosPtr SepEnd = consumeSeparator(Start, End);
if (SepEnd != End) {
PosPtr TkEnd = consumeName(SepEnd, End);
if (TkEnd)
return makeState(PS_InFilenames, SepEnd, TkEnd);
}
return makeState(PS_InTrailingSep, Start, SepEnd);
}
case PS_InTrailingSep:
return makeState(PS_AtEnd);
case PS_InRootName:
case PS_AtEnd:
_LIBCPP_UNREACHABLE();
}
}
void decrement() noexcept {
const PosPtr REnd = getBeforeFront();
const PosPtr RStart = getCurrentTokenStartPos() - 1;
if (RStart == REnd) // we're decrementing the begin
return makeState(PS_BeforeBegin);
switch (State) {
case PS_AtEnd: {
// Try to consume a trailing separator or root directory first.
if (PosPtr SepEnd = consumeSeparator(RStart, REnd)) {
if (SepEnd == REnd)
return makeState(PS_InRootDir, Path.data(), RStart + 1);
return makeState(PS_InTrailingSep, SepEnd + 1, RStart + 1);
} else {
PosPtr TkStart = consumeName(RStart, REnd);
return makeState(PS_InFilenames, TkStart + 1, RStart + 1);
}
}
case PS_InTrailingSep:
return makeState(PS_InFilenames, consumeName(RStart, REnd) + 1,
RStart + 1);
case PS_InFilenames: {
PosPtr SepEnd = consumeSeparator(RStart, REnd);
if (SepEnd == REnd)
return makeState(PS_InRootDir, Path.data(), RStart + 1);
PosPtr TkEnd = consumeName(SepEnd, REnd);
return makeState(PS_InFilenames, TkEnd + 1, SepEnd + 1);
}
case PS_InRootDir:
// return makeState(PS_InRootName, Path.data(), RStart + 1);
case PS_InRootName:
case PS_BeforeBegin:
_LIBCPP_UNREACHABLE();
}
}
/// \brief Return a view with the "preferred representation" of the current
/// element. For example trailing separators are represented as a '.'
string_view_t operator*() const noexcept {
switch (State) {
case PS_BeforeBegin:
case PS_AtEnd:
return "";
case PS_InRootDir:
return "/";
case PS_InTrailingSep:
return "";
case PS_InRootName:
case PS_InFilenames:
return RawEntry;
}
_LIBCPP_UNREACHABLE();
}
explicit operator bool() const noexcept {
return State != PS_BeforeBegin && State != PS_AtEnd;
}
PathParser& operator++() noexcept {
increment();
return *this;
}
PathParser& operator--() noexcept {
decrement();
return *this;
}
bool atEnd() const noexcept {
return State == PS_AtEnd;
}
bool inRootDir() const noexcept {
return State == PS_InRootDir;
}
bool inRootName() const noexcept {
return State == PS_InRootName;
}
bool inRootPath() const noexcept {
return inRootName() || inRootDir();
}
private:
void makeState(ParserState NewState, PosPtr Start, PosPtr End) noexcept {
State = NewState;
RawEntry = string_view_t(Start, End - Start);
}
void makeState(ParserState NewState) noexcept {
State = NewState;
RawEntry = {};
}
PosPtr getAfterBack() const noexcept { return Path.data() + Path.size(); }
PosPtr getBeforeFront() const noexcept { return Path.data() - 1; }
/// \brief Return a pointer to the first character after the currently
/// lexed element.
PosPtr getNextTokenStartPos() const noexcept {
switch (State) {
case PS_BeforeBegin:
return Path.data();
case PS_InRootName:
case PS_InRootDir:
case PS_InFilenames:
return &RawEntry.back() + 1;
case PS_InTrailingSep:
case PS_AtEnd:
return getAfterBack();
}
_LIBCPP_UNREACHABLE();
}
/// \brief Return a pointer to the first character in the currently lexed
/// element.
PosPtr getCurrentTokenStartPos() const noexcept {
switch (State) {
case PS_BeforeBegin:
case PS_InRootName:
return &Path.front();
case PS_InRootDir:
case PS_InFilenames:
case PS_InTrailingSep:
return &RawEntry.front();
case PS_AtEnd:
return &Path.back() + 1;
}
_LIBCPP_UNREACHABLE();
}
PosPtr consumeSeparator(PosPtr P, PosPtr End) const noexcept {
if (P == End || *P != '/')
return nullptr;
const int Inc = P < End ? 1 : -1;
P += Inc;
while (P != End && *P == '/')
P += Inc;
return P;
}
PosPtr consumeName(PosPtr P, PosPtr End) const noexcept {
if (P == End || *P == '/')
return nullptr;
const int Inc = P < End ? 1 : -1;
P += Inc;
while (P != End && *P != '/')
P += Inc;
return P;
}
};
string_view_pair separate_filename(string_view_t const& s) {
if (s == "." || s == ".." || s.empty())
return string_view_pair{s, ""};
auto pos = s.find_last_of('.');
if (pos == string_view_t::npos || pos == 0)
return string_view_pair{s, string_view_t{}};
return string_view_pair{s.substr(0, pos), s.substr(pos)};
}
string_view_t createView(PosPtr S, PosPtr E) noexcept {
return {S, static_cast<size_t>(E - S) + 1};
}
} // namespace parser
} // namespace
// POSIX HELPERS
namespace detail {
namespace {
using value_type = path::value_type;
using string_type = path::string_type;
struct FileDescriptor {
const path& name;
int fd = -1;
StatT m_stat;
file_status m_status;
template <class... Args>
static FileDescriptor create(const path* p, error_code& ec, Args... args) {
ec.clear();
int fd;
if ((fd = ::open(p->c_str(), args...)) == -1) {
ec = capture_errno();
return FileDescriptor{p};
}
return FileDescriptor(p, fd);
}
template <class... Args>
static FileDescriptor create_with_status(const path* p, error_code& ec,
Args... args) {
FileDescriptor fd = create(p, ec, args...);
if (!ec)
fd.refresh_status(ec);
return fd;
}
file_status get_status() const { return m_status; }
StatT const& get_stat() const { return m_stat; }
bool status_known() const { return _VSTD_FS::status_known(m_status); }
file_status refresh_status(error_code& ec);
void close() noexcept {
if (fd != -1)
::close(fd);
fd = -1;
}
FileDescriptor(FileDescriptor&& other)
: name(other.name), fd(other.fd), m_stat(other.m_stat),
m_status(other.m_status) {
other.fd = -1;
other.m_status = file_status{};
}
~FileDescriptor() { close(); }
FileDescriptor(FileDescriptor const&) = delete;
FileDescriptor& operator=(FileDescriptor const&) = delete;
private:
explicit FileDescriptor(const path* p, int fd = -1) : name(*p), fd(fd) {}
};
perms posix_get_perms(const StatT& st) noexcept {
return static_cast<perms>(st.st_mode) & perms::mask;
}
::mode_t posix_convert_perms(perms prms) {
return static_cast< ::mode_t>(prms & perms::mask);
}
file_status create_file_status(error_code& m_ec, path const& p,
const StatT& path_stat, error_code* ec) {
if (ec)
*ec = m_ec;
if (m_ec && (m_ec.value() == ENOENT || m_ec.value() == ENOTDIR)) {
return file_status(file_type::not_found);
} else if (m_ec) {
ErrorHandler<void> err("posix_stat", ec, &p);
err.report(m_ec, "failed to determine attributes for the specified path");
return file_status(file_type::none);
}
// else
file_status fs_tmp;
auto const mode = path_stat.st_mode;
if (S_ISLNK(mode))
fs_tmp.type(file_type::symlink);
else if (S_ISREG(mode))
fs_tmp.type(file_type::regular);
else if (S_ISDIR(mode))
fs_tmp.type(file_type::directory);
else if (S_ISBLK(mode))
fs_tmp.type(file_type::block);
else if (S_ISCHR(mode))
fs_tmp.type(file_type::character);
else if (S_ISFIFO(mode))
fs_tmp.type(file_type::fifo);
else if (S_ISSOCK(mode))
fs_tmp.type(file_type::socket);
else
fs_tmp.type(file_type::unknown);
fs_tmp.permissions(detail::posix_get_perms(path_stat));
return fs_tmp;
}
file_status posix_stat(path const& p, StatT& path_stat, error_code* ec) {
error_code m_ec;
if (::stat(p.c_str(), &path_stat) == -1)
m_ec = detail::capture_errno();
return create_file_status(m_ec, p, path_stat, ec);
}
file_status posix_stat(path const& p, error_code* ec) {
StatT path_stat;
return posix_stat(p, path_stat, ec);
}
file_status posix_lstat(path const& p, StatT& path_stat, error_code* ec) {
error_code m_ec;
if (::lstat(p.c_str(), &path_stat) == -1)
m_ec = detail::capture_errno();
return create_file_status(m_ec, p, path_stat, ec);
}
file_status posix_lstat(path const& p, error_code* ec) {
StatT path_stat;
return posix_lstat(p, path_stat, ec);
}
// http://pubs.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html
bool posix_ftruncate(const FileDescriptor& fd, off_t to_size, error_code& ec) {
if (::ftruncate(fd.fd, to_size) == -1) {
ec = capture_errno();
return true;
}
ec.clear();
return false;
}
bool posix_fchmod(const FileDescriptor& fd, const StatT& st, error_code& ec) {
if (::fchmod(fd.fd, st.st_mode) == -1) {
ec = capture_errno();
return true;
}
ec.clear();
return false;
}
bool stat_equivalent(const StatT& st1, const StatT& st2) {
return (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
}
file_status FileDescriptor::refresh_status(error_code& ec) {
// FD must be open and good.
m_status = file_status{};
m_stat = {};
error_code m_ec;
if (::fstat(fd, &m_stat) == -1)
m_ec = capture_errno();
m_status = create_file_status(m_ec, name, m_stat, &ec);
return m_status;
}
} // namespace
} // end namespace detail
using detail::capture_errno;
using detail::ErrorHandler;
using detail::StatT;
using detail::TimeSpec;
using parser::createView;
using parser::PathParser;
using parser::string_view_t;
const bool _FilesystemClock::is_steady;
_FilesystemClock::time_point _FilesystemClock::now() noexcept {
typedef chrono::duration<rep> __secs;
#if defined(_LIBCPP_USE_CLOCK_GETTIME) && defined(CLOCK_REALTIME)
typedef chrono::duration<rep, nano> __nsecs;
struct timespec tp;
if (0 != clock_gettime(CLOCK_REALTIME, &tp))
__throw_system_error(errno, "clock_gettime(CLOCK_REALTIME) failed");
return time_point(__secs(tp.tv_sec) +
chrono::duration_cast<duration>(__nsecs(tp.tv_nsec)));
#else
typedef chrono::duration<rep, micro> __microsecs;
timeval tv;
gettimeofday(&tv, 0);
return time_point(__secs(tv.tv_sec) + __microsecs(tv.tv_usec));
#endif // _LIBCPP_USE_CLOCK_GETTIME && CLOCK_REALTIME
}
filesystem_error::~filesystem_error() {}
void filesystem_error::__create_what(int __num_paths) {
const char* derived_what = system_error::what();
__storage_->__what_ = [&]() -> string {
const char* p1 = path1().native().empty() ? "\"\"" : path1().c_str();
const char* p2 = path2().native().empty() ? "\"\"" : path2().c_str();
switch (__num_paths) {
default:
return detail::format_string("filesystem error: %s", derived_what);
case 1:
return detail::format_string("filesystem error: %s [%s]", derived_what,
p1);
case 2:
return detail::format_string("filesystem error: %s [%s] [%s]",
derived_what, p1, p2);
}
}();
}
static path __do_absolute(const path& p, path* cwd, error_code* ec) {
if (ec)
ec->clear();
if (p.is_absolute())
return p;
*cwd = __current_path(ec);
if (ec && *ec)
return {};
return (*cwd) / p;
}
path __absolute(const path& p, error_code* ec) {
path cwd;
return __do_absolute(p, &cwd, ec);
}
path __canonical(path const& orig_p, error_code* ec) {
path cwd;
ErrorHandler<path> err("canonical", ec, &orig_p, &cwd);
path p = __do_absolute(orig_p, &cwd, ec);
#if _POSIX_VERSION >= 200112
std::unique_ptr<char, decltype(&::free)>
hold(::realpath(p.c_str(), nullptr), &::free);
if (hold.get() == nullptr)
return err.report(capture_errno());
return {hold.get()};
#else
char buff[PATH_MAX + 1];
char* ret;
if ((ret = ::realpath(p.c_str(), buff)) == nullptr)
return err.report(capture_errno());
return {ret};
#endif
}
void __copy(const path& from, const path& to, copy_options options,
error_code* ec) {
ErrorHandler<void> err("copy", ec, &from, &to);
const bool sym_status = bool(
options & (copy_options::create_symlinks | copy_options::skip_symlinks));
const bool sym_status2 = bool(options & copy_options::copy_symlinks);
error_code m_ec1;
StatT f_st = {};
const file_status f = sym_status || sym_status2
? detail::posix_lstat(from, f_st, &m_ec1)
: detail::posix_stat(from, f_st, &m_ec1);
if (m_ec1)
return err.report(m_ec1);
StatT t_st = {};
const file_status t = sym_status ? detail::posix_lstat(to, t_st, &m_ec1)
: detail::posix_stat(to, t_st, &m_ec1);
if (not status_known(t))
return err.report(m_ec1);
if (!exists(f) || is_other(f) || is_other(t) ||
(is_directory(f) && is_regular_file(t)) ||
detail::stat_equivalent(f_st, t_st)) {
return err.report(errc::function_not_supported);
}
if (ec)
ec->clear();
if (is_symlink(f)) {
if (bool(copy_options::skip_symlinks & options)) {
// do nothing
} else if (not exists(t)) {
__copy_symlink(from, to, ec);
} else {
return err.report(errc::file_exists);
}
return;
} else if (is_regular_file(f)) {
if (bool(copy_options::directories_only & options)) {
// do nothing
} else if (bool(copy_options::create_symlinks & options)) {
__create_symlink(from, to, ec);
} else if (bool(copy_options::create_hard_links & options)) {
__create_hard_link(from, to, ec);
} else if (is_directory(t)) {
__copy_file(from, to / from.filename(), options, ec);
} else {
__copy_file(from, to, options, ec);
}
return;
} else if (is_directory(f) && bool(copy_options::create_symlinks & options)) {
return err.report(errc::is_a_directory);
} else if (is_directory(f) && (bool(copy_options::recursive & options) ||
copy_options::none == options)) {
if (!exists(t)) {
// create directory to with attributes from 'from'.
__create_directory(to, from, ec);
if (ec && *ec) {
return;
}
}
directory_iterator it =
ec ? directory_iterator(from, *ec) : directory_iterator(from);
if (ec && *ec) {
return;
}
error_code m_ec2;
for (; it != directory_iterator(); it.increment(m_ec2)) {
if (m_ec2) {
return err.report(m_ec2);
}
__copy(it->path(), to / it->path().filename(),
options | copy_options::__in_recursive_copy, ec);
if (ec && *ec) {
return;
}
}
}
}
namespace detail {
namespace {
#ifdef _LIBCPP_USE_SENDFILE
bool copy_file_impl_sendfile(FileDescriptor& read_fd, FileDescriptor& write_fd,
error_code& ec) {
size_t count = read_fd.get_stat().st_size;
do {
ssize_t res;
if ((res = ::sendfile(write_fd.fd, read_fd.fd, nullptr, count)) == -1) {
ec = capture_errno();
return false;
}
count -= res;
} while (count > 0);
ec.clear();
return true;
}
#elif defined(_LIBCPP_USE_COPYFILE)
bool copy_file_impl_copyfile(FileDescriptor& read_fd, FileDescriptor& write_fd,
error_code& ec) {
struct CopyFileState {
copyfile_state_t state;
CopyFileState() { state = copyfile_state_alloc(); }
~CopyFileState() { copyfile_state_free(state); }
private:
CopyFileState(CopyFileState const&) = delete;
CopyFileState& operator=(CopyFileState const&) = delete;
};
CopyFileState cfs;
if (fcopyfile(read_fd.fd, write_fd.fd, cfs.state, COPYFILE_DATA) < 0) {
ec = capture_errno();
return false;
}
ec.clear();
return true;
}
#endif
// Note: This function isn't guarded by ifdef's even though it may be unused
// in order to assure it still compiles.
__attribute__((unused)) bool copy_file_impl_default(FileDescriptor& read_fd,
FileDescriptor& write_fd,
error_code& ec) {
ifstream in;
in.__open(read_fd.fd, ios::binary);
if (!in.is_open()) {
// This assumes that __open didn't reset the error code.
ec = capture_errno();
return false;
}
ofstream out;
out.__open(write_fd.fd, ios::binary);
if (!out.is_open()) {
ec = capture_errno();
return false;
}
if (in.good() && out.good()) {
using InIt = istreambuf_iterator<char>;
using OutIt = ostreambuf_iterator<char>;
InIt bin(in);
InIt ein;
OutIt bout(out);
copy(bin, ein, bout);
}
if (out.fail() || in.fail()) {
ec = make_error_code(errc::io_error);
return false;
}
ec.clear();
return true;
}
bool copy_file_impl(FileDescriptor& from, FileDescriptor& to, error_code& ec) {
#if defined(_LIBCPP_USE_SENDFILE)
return copy_file_impl_sendfile(from, to, ec);
#elif defined(_LIBCPP_USE_COPYFILE)
return copy_file_impl_copyfile(from, to, ec);
#else
return copy_file_impl_default(from, to, ec);
#endif
}
} // namespace
} // namespace detail
bool __copy_file(const path& from, const path& to, copy_options options,
error_code* ec) {
using detail::FileDescriptor;
ErrorHandler<bool> err("copy_file", ec, &to, &from);
error_code m_ec;
FileDescriptor from_fd =
FileDescriptor::create_with_status(&from, m_ec, O_RDONLY | O_NONBLOCK);
if (m_ec)
return err.report(m_ec);
auto from_st = from_fd.get_status();
StatT const& from_stat = from_fd.get_stat();
if (!is_regular_file(from_st)) {
if (not m_ec)
m_ec = make_error_code(errc::not_supported);
return err.report(m_ec);
}
const bool skip_existing = bool(copy_options::skip_existing & options);
const bool update_existing = bool(copy_options::update_existing & options);
const bool overwrite_existing =
bool(copy_options::overwrite_existing & options);
StatT to_stat_path;
file_status to_st = detail::posix_stat(to, to_stat_path, &m_ec);
if (!status_known(to_st))
return err.report(m_ec);
const bool to_exists = exists(to_st);
if (to_exists && !is_regular_file(to_st))
return err.report(errc::not_supported);
if (to_exists && detail::stat_equivalent(from_stat, to_stat_path))
return err.report(errc::file_exists);
if (to_exists && skip_existing)
return false;
bool ShouldCopy = [&]() {
if (to_exists && update_existing) {
auto from_time = detail::extract_mtime(from_stat);
auto to_time = detail::extract_mtime(to_stat_path);
if (from_time.tv_sec < to_time.tv_sec)
return false;
if (from_time.tv_sec == to_time.tv_sec &&
from_time.tv_nsec <= to_time.tv_nsec)
return false;
return true;
}
if (!to_exists || overwrite_existing)
return true;
return err.report(errc::file_exists);
}();
if (!ShouldCopy)
return false;
// Don't truncate right away. We may not be opening the file we originally
// looked at; we'll check this later.
int to_open_flags = O_WRONLY;
if (!to_exists)
to_open_flags |= O_CREAT;
FileDescriptor to_fd = FileDescriptor::create_with_status(
&to, m_ec, to_open_flags, from_stat.st_mode);
if (m_ec)
return err.report(m_ec);
if (to_exists) {
// Check that the file we initially stat'ed is equivalent to the one
// we opened.
// FIXME: report this better.
if (!detail::stat_equivalent(to_stat_path, to_fd.get_stat()))
return err.report(errc::bad_file_descriptor);
// Set the permissions and truncate the file we opened.
if (detail::posix_fchmod(to_fd, from_stat, m_ec))
return err.report(m_ec);
if (detail::posix_ftruncate(to_fd, 0, m_ec))
return err.report(m_ec);
}
if (!copy_file_impl(from_fd, to_fd, m_ec)) {
// FIXME: Remove the dest file if we failed, and it didn't exist previously.
return err.report(m_ec);
}
return true;
}
void __copy_symlink(const path& existing_symlink, const path& new_symlink,
error_code* ec) {
const path real_path(__read_symlink(existing_symlink, ec));
if (ec && *ec) {
return;
}
// NOTE: proposal says you should detect if you should call
// create_symlink or create_directory_symlink. I don't think this
// is needed with POSIX
__create_symlink(real_path, new_symlink, ec);
}
bool __create_directories(const path& p, error_code* ec) {
ErrorHandler<bool> err("create_directories", ec, &p);
error_code m_ec;
auto const st = detail::posix_stat(p, &m_ec);
if (!status_known(st))
return err.report(m_ec);
else if (is_directory(st))
return false;
else if (exists(st))
return err.report(errc::file_exists);
const path parent = p.parent_path();
if (!parent.empty()) {
const file_status parent_st = status(parent, m_ec);
if (not status_known(parent_st))
return err.report(m_ec);
if (not exists(parent_st)) {
__create_directories(parent, ec);
if (ec && *ec) {
return false;
}
}
}
return __create_directory(p, ec);
}
bool __create_directory(const path& p, error_code* ec) {
ErrorHandler<bool> err("create_directory", ec, &p);
if (::mkdir(p.c_str(), static_cast<int>(perms::all)) == 0)
return true;
if (errno != EEXIST)
err.report(capture_errno());
return false;
}
bool __create_directory(path const& p, path const& attributes, error_code* ec) {
ErrorHandler<bool> err("create_directory", ec, &p, &attributes);
StatT attr_stat;
error_code mec;
auto st = detail::posix_stat(attributes, attr_stat, &mec);
if (!status_known(st))
return err.report(mec);
if (!is_directory(st))
return err.report(errc::not_a_directory,
"the specified attribute path is invalid");
if (::mkdir(p.c_str(), attr_stat.st_mode) == 0)
return true;
if (errno != EEXIST)
err.report(capture_errno());
return false;
}
void __create_directory_symlink(path const& from, path const& to,
error_code* ec) {
ErrorHandler<void> err("create_directory_symlink", ec, &from, &to);
if (::symlink(from.c_str(), to.c_str()) != 0)
return err.report(capture_errno());
}
void __create_hard_link(const path& from, const path& to, error_code* ec) {
ErrorHandler<void> err("create_hard_link", ec, &from, &to);
if (::link(from.c_str(), to.c_str()) == -1)
return err.report(capture_errno());
}
void __create_symlink(path const& from, path const& to, error_code* ec) {
ErrorHandler<void> err("create_symlink", ec, &from, &to);
if (::symlink(from.c_str(), to.c_str()) == -1)
return err.report(capture_errno());
}
path __current_path(error_code* ec) {
ErrorHandler<path> err("current_path", ec);
auto size = ::pathconf(".", _PC_PATH_MAX);
_LIBCPP_ASSERT(size >= 0, "pathconf returned a 0 as max size");
auto buff = unique_ptr<char[]>(new char[size + 1]);
char* ret;
if ((ret = ::getcwd(buff.get(), static_cast<size_t>(size))) == nullptr)
return err.report(capture_errno(), "call to getcwd failed");
return {buff.get()};
}
void __current_path(const path& p, error_code* ec) {
ErrorHandler<void> err("current_path", ec, &p);
if (::chdir(p.c_str()) == -1)
err.report(capture_errno());
}
bool __equivalent(const path& p1, const path& p2, error_code* ec) {
ErrorHandler<bool> err("equivalent", ec, &p1, &p2);
error_code ec1, ec2;
StatT st1 = {}, st2 = {};
auto s1 = detail::posix_stat(p1.native(), st1, &ec1);
if (!exists(s1))
return err.report(errc::not_supported);
auto s2 = detail::posix_stat(p2.native(), st2, &ec2);
if (!exists(s2))
return err.report(errc::not_supported);
return detail::stat_equivalent(st1, st2);
}
uintmax_t __file_size(const path& p, error_code* ec) {
ErrorHandler<uintmax_t> err("file_size", ec, &p);
error_code m_ec;
StatT st;
file_status fst = detail::posix_stat(p, st, &m_ec);
if (!exists(fst) || !is_regular_file(fst)) {
errc error_kind =
is_directory(fst) ? errc::is_a_directory : errc::not_supported;
if (!m_ec)
m_ec = make_error_code(error_kind);
return err.report(m_ec);
}
// is_regular_file(p) == true
return static_cast<uintmax_t>(st.st_size);
}
uintmax_t __hard_link_count(const path& p, error_code* ec) {
ErrorHandler<uintmax_t> err("hard_link_count", ec, &p);
error_code m_ec;
StatT st;
detail::posix_stat(p, st, &m_ec);
if (m_ec)
return err.report(m_ec);
return static_cast<uintmax_t>(st.st_nlink);
}
bool __fs_is_empty(const path& p, error_code* ec) {
ErrorHandler<bool> err("is_empty", ec, &p);
error_code m_ec;
StatT pst;
auto st = detail::posix_stat(p, pst, &m_ec);
if (m_ec)
return err.report(m_ec);
else if (!is_directory(st) && !is_regular_file(st))
return err.report(errc::not_supported);
else if (is_directory(st)) {
auto it = ec ? directory_iterator(p, *ec) : directory_iterator(p);
if (ec && *ec)
return false;
return it == directory_iterator{};
} else if (is_regular_file(st))
return static_cast<uintmax_t>(pst.st_size) == 0;
_LIBCPP_UNREACHABLE();
}
static file_time_type __extract_last_write_time(const path& p, const StatT& st,
error_code* ec) {
using detail::fs_time;
ErrorHandler<file_time_type> err("last_write_time", ec, &p);
auto ts = detail::extract_mtime(st);
if (!fs_time::is_representable(ts))
return err.report(errc::value_too_large);
return fs_time::convert_from_timespec(ts);
}
file_time_type __last_write_time(const path& p, error_code* ec) {
using namespace chrono;
ErrorHandler<file_time_type> err("last_write_time", ec, &p);
error_code m_ec;
StatT st;
detail::posix_stat(p, st, &m_ec);
if (m_ec)
return err.report(m_ec);
return __extract_last_write_time(p, st, ec);
}
void __last_write_time(const path& p, file_time_type new_time, error_code* ec) {
using detail::fs_time;
ErrorHandler<void> err("last_write_time", ec, &p);
error_code m_ec;
array<TimeSpec, 2> tbuf;
#if !defined(_LIBCPP_USE_UTIMENSAT)
// This implementation has a race condition between determining the
// last access time and attempting to set it to the same value using
// ::utimes
StatT st;
file_status fst = detail::posix_stat(p, st, &m_ec);
if (m_ec)
return err.report(m_ec);
tbuf[0] = detail::extract_atime(st);
#else
tbuf[0].tv_sec = 0;
tbuf[0].tv_nsec = UTIME_OMIT;
#endif
if (!fs_time::convert_to_timespec(tbuf[1], new_time))
return err.report(errc::value_too_large);
detail::set_file_times(p, tbuf, m_ec);
if (m_ec)
return err.report(m_ec);
}
void __permissions(const path& p, perms prms, perm_options opts,
error_code* ec) {
ErrorHandler<void> err("permissions", ec, &p);
auto has_opt = [&](perm_options o) { return bool(o & opts); };
const bool resolve_symlinks = !has_opt(perm_options::nofollow);
const bool add_perms = has_opt(perm_options::add);
const bool remove_perms = has_opt(perm_options::remove);
_LIBCPP_ASSERT(
(add_perms + remove_perms + has_opt(perm_options::replace)) == 1,
"One and only one of the perm_options constants replace, add, or remove "
"is present in opts");
bool set_sym_perms = false;
prms &= perms::mask;
if (!resolve_symlinks || (add_perms || remove_perms)) {
error_code m_ec;
file_status st = resolve_symlinks ? detail::posix_stat(p, &m_ec)
: detail::posix_lstat(p, &m_ec);
set_sym_perms = is_symlink(st);
if (m_ec)
return err.report(m_ec);
_LIBCPP_ASSERT(st.permissions() != perms::unknown,
"Permissions unexpectedly unknown");
if (add_perms)
prms |= st.permissions();
else if (remove_perms)
prms = st.permissions() & ~prms;
}
const auto real_perms = detail::posix_convert_perms(prms);
#if defined(AT_SYMLINK_NOFOLLOW) && defined(AT_FDCWD)
const int flags = set_sym_perms ? AT_SYMLINK_NOFOLLOW : 0;
if (::fchmodat(AT_FDCWD, p.c_str(), real_perms, flags) == -1) {
return err.report(capture_errno());
}
#else
if (set_sym_perms)
return err.report(errc::operation_not_supported);
if (::chmod(p.c_str(), real_perms) == -1) {
return err.report(capture_errno());
}
#endif
}
path __read_symlink(const path& p, error_code* ec) {
ErrorHandler<path> err("read_symlink", ec, &p);
#ifdef PATH_MAX
struct NullDeleter { void operator()(void*) const {} };
const size_t size = PATH_MAX + 1;
char stack_buff[size];
auto buff = std::unique_ptr<char[], NullDeleter>(stack_buff);
#else
StatT sb;
if (::lstat(p.c_str(), &sb) == -1) {
return err.report(capture_errno());
}
const size_t size = sb.st_size + 1;
auto buff = unique_ptr<char[]>(new char[size]);
#endif
::ssize_t ret;
if ((ret = ::readlink(p.c_str(), buff.get(), size)) == -1)
return err.report(capture_errno());
_LIBCPP_ASSERT(ret > 0, "TODO");
if (static_cast<size_t>(ret) >= size)
return err.report(errc::value_too_large);
buff[ret] = 0;
return {buff.get()};
}
bool __remove(const path& p, error_code* ec) {
ErrorHandler<bool> err("remove", ec, &p);
if (::remove(p.c_str()) == -1) {
if (errno != ENOENT)
err.report(capture_errno());
return false;
}
return true;
}
namespace {
uintmax_t remove_all_impl(path const& p, error_code& ec) {
const auto npos = static_cast<uintmax_t>(-1);
const file_status st = __symlink_status(p, &ec);
if (ec)
return npos;
uintmax_t count = 1;
if (is_directory(st)) {
for (directory_iterator it(p, ec); !ec && it != directory_iterator();
it.increment(ec)) {
auto other_count = remove_all_impl(it->path(), ec);
if (ec)
return npos;
count += other_count;
}
if (ec)
return npos;
}
if (!__remove(p, &ec))
return npos;
return count;
}
} // end namespace
uintmax_t __remove_all(const path& p, error_code* ec) {
ErrorHandler<uintmax_t> err("remove_all", ec, &p);
error_code mec;
auto count = remove_all_impl(p, mec);
if (mec) {
if (mec == errc::no_such_file_or_directory)
return 0;
return err.report(mec);
}
return count;
}
void __rename(const path& from, const path& to, error_code* ec) {
ErrorHandler<void> err("rename", ec, &from, &to);
if (::rename(from.c_str(), to.c_str()) == -1)
err.report(capture_errno());
}
void __resize_file(const path& p, uintmax_t size, error_code* ec) {
ErrorHandler<void> err("resize_file", ec, &p);
if (::truncate(p.c_str(), static_cast< ::off_t>(size)) == -1)
return err.report(capture_errno());
}
space_info __space(const path& p, error_code* ec) {
ErrorHandler<void> err("space", ec, &p);
space_info si;
struct statvfs m_svfs = {};
if (::statvfs(p.c_str(), &m_svfs) == -1) {
err.report(capture_errno());
si.capacity = si.free = si.available = static_cast<uintmax_t>(-1);
return si;
}
// Multiply with overflow checking.
auto do_mult = [&](uintmax_t& out, uintmax_t other) {
out = other * m_svfs.f_frsize;
if (other == 0 || out / other != m_svfs.f_frsize)
out = static_cast<uintmax_t>(-1);
};
do_mult(si.capacity, m_svfs.f_blocks);
do_mult(si.free, m_svfs.f_bfree);
do_mult(si.available, m_svfs.f_bavail);
return si;
}
file_status __status(const path& p, error_code* ec) {
return detail::posix_stat(p, ec);
}
file_status __symlink_status(const path& p, error_code* ec) {
return detail::posix_lstat(p, ec);
}
path __temp_directory_path(error_code* ec) {
ErrorHandler<path> err("temp_directory_path", ec);
const char* env_paths[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
const char* ret = nullptr;
for (auto& ep : env_paths)
if ((ret = getenv(ep)))
break;
if (ret == nullptr)
ret = "/tmp";
path p(ret);
error_code m_ec;
file_status st = detail::posix_stat(p, &m_ec);
if (!status_known(st))
return err.report(m_ec, "cannot access path \"%s\"", p);
if (!exists(st) || !is_directory(st))
return err.report(errc::not_a_directory, "path \"%s\" is not a directory",
p);
return p;
}
path __weakly_canonical(const path& p, error_code* ec) {
ErrorHandler<path> err("weakly_canonical", ec, &p);
if (p.empty())
return __canonical("", ec);
path result;
path tmp;
tmp.__reserve(p.native().size());
auto PP = PathParser::CreateEnd(p.native());
--PP;
vector<string_view_t> DNEParts;
while (PP.State != PathParser::PS_BeforeBegin) {
tmp.assign(createView(p.native().data(), &PP.RawEntry.back()));
error_code m_ec;
file_status st = __status(tmp, &m_ec);
if (!status_known(st)) {
return err.report(m_ec);
} else if (exists(st)) {
result = __canonical(tmp, ec);
break;
}
DNEParts.push_back(*PP);
--PP;
}
if (PP.State == PathParser::PS_BeforeBegin)
result = __canonical("", ec);
if (ec)
ec->clear();
if (DNEParts.empty())
return result;
for (auto It = DNEParts.rbegin(); It != DNEParts.rend(); ++It)
result /= *It;
return result.lexically_normal();
}
///////////////////////////////////////////////////////////////////////////////
// path definitions
///////////////////////////////////////////////////////////////////////////////
constexpr path::value_type path::preferred_separator;
path& path::replace_extension(path const& replacement) {
path p = extension();
if (not p.empty()) {
__pn_.erase(__pn_.size() - p.native().size());
}
if (!replacement.empty()) {
if (replacement.native()[0] != '.') {
__pn_ += ".";
}
__pn_.append(replacement.__pn_);
}
return *this;
}
///////////////////////////////////////////////////////////////////////////////
// path.decompose
string_view_t path::__root_name() const {
auto PP = PathParser::CreateBegin(__pn_);
if (PP.State == PathParser::PS_InRootName)
return *PP;
return {};
}
string_view_t path::__root_directory() const {
auto PP = PathParser::CreateBegin(__pn_);
if (PP.State == PathParser::PS_InRootName)
++PP;
if (PP.State == PathParser::PS_InRootDir)
return *PP;
return {};
}
string_view_t path::__root_path_raw() const {
auto PP = PathParser::CreateBegin(__pn_);
if (PP.State == PathParser::PS_InRootName) {
auto NextCh = PP.peek();
if (NextCh && *NextCh == '/') {
++PP;
return createView(__pn_.data(), &PP.RawEntry.back());
}
return PP.RawEntry;
}
if (PP.State == PathParser::PS_InRootDir)
return *PP;
return {};
}
static bool ConsumeRootName(PathParser *PP) {
static_assert(PathParser::PS_BeforeBegin == 1 &&
PathParser::PS_InRootName == 2,
"Values for enums are incorrect");
while (PP->State <= PathParser::PS_InRootName)
++(*PP);
return PP->State == PathParser::PS_AtEnd;
}
static bool ConsumeRootDir(PathParser* PP) {
static_assert(PathParser::PS_BeforeBegin == 1 &&
PathParser::PS_InRootName == 2 &&
PathParser::PS_InRootDir == 3, "Values for enums are incorrect");
while (PP->State <= PathParser::PS_InRootDir)
++(*PP);
return PP->State == PathParser::PS_AtEnd;
}
string_view_t path::__relative_path() const {
auto PP = PathParser::CreateBegin(__pn_);
if (ConsumeRootDir(&PP))
return {};
return createView(PP.RawEntry.data(), &__pn_.back());
}
string_view_t path::__parent_path() const {
if (empty())
return {};
// Determine if we have a root path but not a relative path. In that case
// return *this.
{
auto PP = PathParser::CreateBegin(__pn_);
if (ConsumeRootDir(&PP))
return __pn_;
}
// Otherwise remove a single element from the end of the path, and return
// a string representing that path
{
auto PP = PathParser::CreateEnd(__pn_);
--PP;
if (PP.RawEntry.data() == __pn_.data())
return {};
--PP;
return createView(__pn_.data(), &PP.RawEntry.back());
}
}
string_view_t path::__filename() const {
if (empty())
return {};
{
PathParser PP = PathParser::CreateBegin(__pn_);
if (ConsumeRootDir(&PP))
return {};
}
return *(--PathParser::CreateEnd(__pn_));
}
string_view_t path::__stem() const {
return parser::separate_filename(__filename()).first;
}
string_view_t path::__extension() const {
return parser::separate_filename(__filename()).second;
}
////////////////////////////////////////////////////////////////////////////
// path.gen
enum PathPartKind : unsigned char {
PK_None,
PK_RootSep,
PK_Filename,
PK_Dot,
PK_DotDot,
PK_TrailingSep
};
static PathPartKind ClassifyPathPart(string_view_t Part) {
if (Part.empty())
return PK_TrailingSep;
if (Part == ".")
return PK_Dot;
if (Part == "..")
return PK_DotDot;
if (Part == "/")
return PK_RootSep;
return PK_Filename;
}
path path::lexically_normal() const {
if (__pn_.empty())
return *this;
using PartKindPair = pair<string_view_t, PathPartKind>;
vector<PartKindPair> Parts;
// Guess as to how many elements the path has to avoid reallocating.
Parts.reserve(32);
// Track the total size of the parts as we collect them. This allows the
// resulting path to reserve the correct amount of memory.
size_t NewPathSize = 0;
auto AddPart = [&](PathPartKind K, string_view_t P) {
NewPathSize += P.size();
Parts.emplace_back(P, K);
};
auto LastPartKind = [&]() {
if (Parts.empty())
return PK_None;
return Parts.back().second;
};
bool MaybeNeedTrailingSep = false;
// Build a stack containing the remaining elements of the path, popping off
// elements which occur before a '..' entry.
for (auto PP = PathParser::CreateBegin(__pn_); PP; ++PP) {
auto Part = *PP;
PathPartKind Kind = ClassifyPathPart(Part);
switch (Kind) {
case PK_Filename:
case PK_RootSep: {
// Add all non-dot and non-dot-dot elements to the stack of elements.
AddPart(Kind, Part);
MaybeNeedTrailingSep = false;
break;
}
case PK_DotDot: {
// Only push a ".." element if there are no elements preceding the "..",
// or if the preceding element is itself "..".
auto LastKind = LastPartKind();
if (LastKind == PK_Filename) {
NewPathSize -= Parts.back().first.size();
Parts.pop_back();
} else if (LastKind != PK_RootSep)
AddPart(PK_DotDot, "..");
MaybeNeedTrailingSep = LastKind == PK_Filename;
break;
}
case PK_Dot:
case PK_TrailingSep: {
MaybeNeedTrailingSep = true;
break;
}
case PK_None:
_LIBCPP_UNREACHABLE();
}
}
// [fs.path.generic]p6.8: If the path is empty, add a dot.
if (Parts.empty())
return ".";
// [fs.path.generic]p6.7: If the last filename is dot-dot, remove any
// trailing directory-separator.
bool NeedTrailingSep = MaybeNeedTrailingSep && LastPartKind() == PK_Filename;
path Result;
Result.__pn_.reserve(Parts.size() + NewPathSize + NeedTrailingSep);
for (auto& PK : Parts)
Result /= PK.first;
if (NeedTrailingSep)
Result /= "";
return Result;
}
static int DetermineLexicalElementCount(PathParser PP) {
int Count = 0;
for (; PP; ++PP) {
auto Elem = *PP;
if (Elem == "..")
--Count;
else if (Elem != "." && Elem != "")
++Count;
}
return Count;
}
path path::lexically_relative(const path& base) const {
{ // perform root-name/root-directory mismatch checks
auto PP = PathParser::CreateBegin(__pn_);
auto PPBase = PathParser::CreateBegin(base.__pn_);
auto CheckIterMismatchAtBase = [&]() {
return PP.State != PPBase.State &&
(PP.inRootPath() || PPBase.inRootPath());
};
if (PP.inRootName() && PPBase.inRootName()) {
if (*PP != *PPBase)
return {};
} else if (CheckIterMismatchAtBase())
return {};
if (PP.inRootPath())
++PP;
if (PPBase.inRootPath())
++PPBase;
if (CheckIterMismatchAtBase())
return {};
}
// Find the first mismatching element
auto PP = PathParser::CreateBegin(__pn_);
auto PPBase = PathParser::CreateBegin(base.__pn_);
while (PP && PPBase && PP.State == PPBase.State && *PP == *PPBase) {
++PP;
++PPBase;
}
// If there is no mismatch, return ".".
if (!PP && !PPBase)
return ".";
// Otherwise, determine the number of elements, 'n', which are not dot or
// dot-dot minus the number of dot-dot elements.
int ElemCount = DetermineLexicalElementCount(PPBase);
if (ElemCount < 0)
return {};
// if n == 0 and (a == end() || a->empty()), returns path("."); otherwise
if (ElemCount == 0 && (PP.atEnd() || *PP == ""))
return ".";
// return a path constructed with 'n' dot-dot elements, followed by the the
// elements of '*this' after the mismatch.
path Result;
// FIXME: Reserve enough room in Result that it won't have to re-allocate.
while (ElemCount--)
Result /= "..";
for (; PP; ++PP)
Result /= *PP;
return Result;
}
////////////////////////////////////////////////////////////////////////////
// path.comparisons
static int CompareRootName(PathParser *LHS, PathParser *RHS) {
if (!LHS->inRootName() && !RHS->inRootName())
return 0;
auto GetRootName = [](PathParser *Parser) -> string_view_t {
return Parser->inRootName() ? **Parser : "";
};
int res = GetRootName(LHS).compare(GetRootName(RHS));
ConsumeRootName(LHS);
ConsumeRootName(RHS);
return res;
}
static int CompareRootDir(PathParser *LHS, PathParser *RHS) {
if (!LHS->inRootDir() && RHS->inRootDir())
return -1;
else if (LHS->inRootDir() && !RHS->inRootDir())
return 1;
else {
ConsumeRootDir(LHS);
ConsumeRootDir(RHS);
return 0;
}
}
static int CompareRelative(PathParser *LHSPtr, PathParser *RHSPtr) {
auto &LHS = *LHSPtr;
auto &RHS = *RHSPtr;
int res;
while (LHS && RHS) {
if ((res = (*LHS).compare(*RHS)) != 0)
return res;
++LHS;
++RHS;
}
return 0;
}
static int CompareEndState(PathParser *LHS, PathParser *RHS) {
if (LHS->atEnd() && !RHS->atEnd())
return -1;
else if (!LHS->atEnd() && RHS->atEnd())
return 1;
return 0;
}
int path::__compare(string_view_t __s) const {
auto LHS = PathParser::CreateBegin(__pn_);
auto RHS = PathParser::CreateBegin(__s);
int res;
if ((res = CompareRootName(&LHS, &RHS)) != 0)
return res;
if ((res = CompareRootDir(&LHS, &RHS)) != 0)
return res;
if ((res = CompareRelative(&LHS, &RHS)) != 0)
return res;
return CompareEndState(&LHS, &RHS);
}
////////////////////////////////////////////////////////////////////////////
// path.nonmembers
size_t hash_value(const path& __p) noexcept {
auto PP = PathParser::CreateBegin(__p.native());
size_t hash_value = 0;
hash<string_view_t> hasher;
while (PP) {
hash_value = __hash_combine(hash_value, hasher(*PP));
++PP;
}
return hash_value;
}
////////////////////////////////////////////////////////////////////////////
// path.itr
path::iterator path::begin() const {
auto PP = PathParser::CreateBegin(__pn_);
iterator it;
it.__path_ptr_ = this;
it.__state_ = static_cast<path::iterator::_ParserState>(PP.State);
it.__entry_ = PP.RawEntry;
it.__stashed_elem_.__assign_view(*PP);
return it;
}
path::iterator path::end() const {
iterator it{};
it.__state_ = path::iterator::_AtEnd;
it.__path_ptr_ = this;
return it;
}
path::iterator& path::iterator::__increment() {
PathParser PP(__path_ptr_->native(), __entry_, __state_);
++PP;
__state_ = static_cast<_ParserState>(PP.State);
__entry_ = PP.RawEntry;
__stashed_elem_.__assign_view(*PP);
return *this;
}
path::iterator& path::iterator::__decrement() {
PathParser PP(__path_ptr_->native(), __entry_, __state_);
--PP;
__state_ = static_cast<_ParserState>(PP.State);
__entry_ = PP.RawEntry;
__stashed_elem_.__assign_view(*PP);
return *this;
}
///////////////////////////////////////////////////////////////////////////////
// directory entry definitions
///////////////////////////////////////////////////////////////////////////////
#ifndef _LIBCPP_WIN32API
error_code directory_entry::__do_refresh() noexcept {
__data_.__reset();
error_code failure_ec;
StatT full_st;
file_status st = detail::posix_lstat(__p_, full_st, &failure_ec);
if (!status_known(st)) {
__data_.__reset();
return failure_ec;
}
if (!_VSTD_FS::exists(st) || !_VSTD_FS::is_symlink(st)) {
__data_.__cache_type_ = directory_entry::_RefreshNonSymlink;
__data_.__type_ = st.type();
__data_.__non_sym_perms_ = st.permissions();
} else { // we have a symlink
__data_.__sym_perms_ = st.permissions();
// Get the information about the linked entity.
// Ignore errors from stat, since we don't want errors regarding symlink
// resolution to be reported to the user.
error_code ignored_ec;
st = detail::posix_stat(__p_, full_st, &ignored_ec);
__data_.__type_ = st.type();
__data_.__non_sym_perms_ = st.permissions();
// If we failed to resolve the link, then only partially populate the
// cache.
if (!status_known(st)) {
__data_.__cache_type_ = directory_entry::_RefreshSymlinkUnresolved;
return error_code{};
}
// Otherwise, we resolved the link, potentially as not existing.
// That's OK.
__data_.__cache_type_ = directory_entry::_RefreshSymlink;
}
if (_VSTD_FS::is_regular_file(st))
__data_.__size_ = static_cast<uintmax_t>(full_st.st_size);
if (_VSTD_FS::exists(st)) {
__data_.__nlink_ = static_cast<uintmax_t>(full_st.st_nlink);
// Attempt to extract the mtime, and fail if it's not representable using
// file_time_type. For now we ignore the error, as we'll report it when
// the value is actually used.
error_code ignored_ec;
__data_.__write_time_ =
__extract_last_write_time(__p_, full_st, &ignored_ec);
}
return failure_ec;
}
#else
error_code directory_entry::__do_refresh() noexcept {
__data_.__reset();
error_code failure_ec;
file_status st = _VSTD_FS::symlink_status(__p_, failure_ec);
if (!status_known(st)) {
__data_.__reset();
return failure_ec;
}
if (!_VSTD_FS::exists(st) || !_VSTD_FS::is_symlink(st)) {
__data_.__cache_type_ = directory_entry::_RefreshNonSymlink;
__data_.__type_ = st.type();
__data_.__non_sym_perms_ = st.permissions();
} else { // we have a symlink
__data_.__sym_perms_ = st.permissions();
// Get the information about the linked entity.
// Ignore errors from stat, since we don't want errors regarding symlink
// resolution to be reported to the user.
error_code ignored_ec;
st = _VSTD_FS::status(__p_, ignored_ec);
__data_.__type_ = st.type();
__data_.__non_sym_perms_ = st.permissions();
// If we failed to resolve the link, then only partially populate the
// cache.
if (!status_known(st)) {
__data_.__cache_type_ = directory_entry::_RefreshSymlinkUnresolved;
return error_code{};
}
__data_.__cache_type_ = directory_entry::_RefreshSymlink;
}
// FIXME: This is currently broken, and the implementation only a placeholder.
// We need to cache last_write_time, file_size, and hard_link_count here before
// the implementation actually works.
return failure_ec;
}
#endif
_LIBCPP_END_NAMESPACE_FILESYSTEM
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