Merge libc++, libc++abi and libunwind version 7.0.1.

Tested by visa on octeon
Tested by kettenis on arm64, armv7 and sparc64
"go for it" deraadt and sthen

1 files changed, 0 insertions, 808 deletions

diff --git a/lib/libcxx/src/experimental/filesystem/operations.cpp b/lib/libcxx/src/experimental/filesystem/operations.cpp
deleted file mode 100644
index 662fa7b8626..00000000000
--- a/lib/libcxx/src/experimental/filesystem/operations.cpp
+++ /dev/null
@@ -1,808 +0,0 @@
-//===--------------------- filesystem/ops.cpp -----------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-
-#include "experimental/filesystem"
-#include "iterator"
-#include "fstream"
-#include "type_traits"
-#include "random"  /* for unique_path */
-#include "cstdlib"
-#include "climits"
-
-#include "filesystem_time_helper.h"
-
-#include <unistd.h>
-#include <sys/stat.h>
-#include <sys/statvfs.h>
-#include <fcntl.h>  /* values for fchmodat */
-#if !defined(UTIME_OMIT)
-#include <sys/time.h> // for ::utimes as used in __last_write_time
-#endif
-
-_LIBCPP_BEGIN_NAMESPACE_EXPERIMENTAL_FILESYSTEM
-
-filesystem_error::~filesystem_error() {}
-
-
-//                       POSIX HELPERS
-
-namespace detail { namespace  {
-
-using value_type = path::value_type;
-using string_type = path::string_type;
-
-inline std::error_code capture_errno() {
-  _LIBCPP_ASSERT(errno, "Expected errno to be non-zero");
-  return std::error_code(errno, std::generic_category());
-}
-
-void set_or_throw(std::error_code const& m_ec, std::error_code* ec,
-                  const char* msg, path const& p = {}, path const& p2 = {})
-{
-    if (ec) {
-        *ec = m_ec;
-    } else {
-        string msg_s("std::experimental::filesystem::");
-        msg_s += msg;
-        __throw_filesystem_error(msg_s, p, p2, m_ec);
-    }
-}
-
-void set_or_throw(std::error_code* ec, const char* msg,
-                  path const& p = {}, path const& p2 = {})
-{
-    return set_or_throw(capture_errno(), ec, msg, p, p2);
-}
-
-perms posix_get_perms(const struct ::stat & 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(std::error_code& m_ec, path const& p,
-                               struct ::stat& path_stat,
-                               std::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) {
-        set_or_throw(m_ec, ec, "posix_stat", p);
-        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, struct ::stat& path_stat,
-                       std::error_code* ec)
-{
-    std::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, std::error_code* ec) {
-    struct ::stat path_stat;
-    return posix_stat(p, path_stat, ec);
-}
-
-file_status posix_lstat(path const & p, struct ::stat & path_stat,
-                        std::error_code* ec)
-{
-    std::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, std::error_code* ec) {
-    struct ::stat path_stat;
-    return posix_lstat(p, path_stat, ec);
-}
-
-bool stat_equivalent(struct ::stat& st1, struct ::stat& st2) {
-    return (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
-}
-
-//                           DETAIL::MISC
-
-
-bool copy_file_impl(const path& from, const path& to, perms from_perms,
-                    std::error_code *ec)
-{
-    std::ifstream in(from.c_str(), std::ios::binary);
-    std::ofstream out(to.c_str(),  std::ios::binary);
-
-    if (in.good() && out.good()) {
-        using InIt = std::istreambuf_iterator<char>;
-        using OutIt = std::ostreambuf_iterator<char>;
-        InIt bin(in);
-        InIt ein;
-        OutIt bout(out);
-        std::copy(bin, ein, bout);
-    }
-    if (out.fail() || in.fail()) {
-        set_or_throw(make_error_code(errc::operation_not_permitted),
-                     ec, "copy_file", from, to);
-        return false;
-    }
-    __permissions(to, from_perms, ec);
-    // TODO what if permissions fails?
-    return true;
-}
-
-}} // end namespace detail
-
-using detail::set_or_throw;
-
-path __canonical(path const & orig_p, const path& base, std::error_code *ec)
-{
-    path p = absolute(orig_p, base);
-    char buff[PATH_MAX + 1];
-    char *ret;
-    if ((ret = ::realpath(p.c_str(), buff)) == nullptr) {
-        set_or_throw(ec, "canonical", orig_p, base);
-        return {};
-    }
-    if (ec) ec->clear();
-    return {ret};
-}
-
-void __copy(const path& from, const path& to, copy_options options,
-            std::error_code *ec)
-{
-    const bool sym_status = bool(options &
-        (copy_options::create_symlinks | copy_options::skip_symlinks));
-
-    const bool sym_status2 = bool(options &
-        copy_options::copy_symlinks);
-
-    std::error_code m_ec1;
-    struct ::stat 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 set_or_throw(m_ec1, ec, "copy", from, to);
-
-    struct ::stat 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 set_or_throw(m_ec1, ec, "copy", from, to);
-
-    if (!exists(f) || is_other(f) || is_other(t)
-        || (is_directory(f) && is_regular_file(t))
-        || detail::stat_equivalent(f_st, t_st))
-    {
-        return set_or_throw(make_error_code(errc::function_not_supported),
-                            ec, "copy", from, to);
-    }
-
-    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 {
-            set_or_throw(make_error_code(errc::file_exists),
-                         ec, "copy", from, to);
-        }
-        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 set_or_throw(make_error_code(errc::is_a_directory), ec, "copy");
-    }
-    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; }
-        std::error_code m_ec2;
-        for (; it != directory_iterator(); it.increment(m_ec2)) {
-            if (m_ec2) return set_or_throw(m_ec2, ec, "copy", from, to);
-            __copy(it->path(), to / it->path().filename(),
-                   options | copy_options::__in_recursive_copy, ec);
-            if (ec && *ec) { return; }
-        }
-    }
-}
-
-
-bool __copy_file(const path& from, const path& to, copy_options options,
-                 std::error_code *ec)
-{
-    if (ec) ec->clear();
-
-    std::error_code m_ec;
-    auto from_st = detail::posix_stat(from, &m_ec);
-    if (not is_regular_file(from_st)) {
-        if (not m_ec)
-            m_ec = make_error_code(errc::not_supported);
-        set_or_throw(m_ec, ec, "copy_file", from, to);
-        return false;
-    }
-
-    auto to_st = detail::posix_stat(to, &m_ec);
-    if (!status_known(to_st)) {
-        set_or_throw(m_ec, ec, "copy_file", from, to);
-        return false;
-    }
-
-    const bool to_exists = exists(to_st);
-    if (to_exists && !is_regular_file(to_st)) {
-        set_or_throw(make_error_code(errc::not_supported), ec, "copy_file", from, to);
-        return false;
-    }
-    if (to_exists && bool(copy_options::skip_existing & options)) {
-        return false;
-    }
-    else if (to_exists && bool(copy_options::update_existing & options)) {
-        auto from_time = __last_write_time(from, ec);
-        if (ec && *ec) { return false; }
-        auto to_time = __last_write_time(to, ec);
-        if (ec && *ec) { return false; }
-        if (from_time <= to_time) {
-            return false;
-        }
-        return detail::copy_file_impl(from, to, from_st.permissions(), ec);
-    }
-    else if (!to_exists || bool(copy_options::overwrite_existing & options)) {
-        return detail::copy_file_impl(from, to, from_st.permissions(), ec);
-    }
-    else {
-        set_or_throw(make_error_code(errc::file_exists), ec, "copy", from, to);
-        return false;
-    }
-
-    _LIBCPP_UNREACHABLE();
-}
-
-void __copy_symlink(const path& existing_symlink, const path& new_symlink,
-                    std::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, std::error_code *ec)
-{
-    std::error_code m_ec;
-    auto const st = detail::posix_stat(p, &m_ec);
-    if (!status_known(st)) {
-        set_or_throw(m_ec, ec, "create_directories", p);
-        return false;
-    }
-    else if (is_directory(st)) {
-        if (ec) ec->clear();
-        return false;
-    }
-    else if (exists(st)) {
-        set_or_throw(make_error_code(errc::file_exists),
-                     ec, "create_directories", p);
-        return false;
-    }
-
-    const path parent = p.parent_path();
-    if (!parent.empty()) {
-        const file_status parent_st = status(parent, m_ec);
-        if (not status_known(parent_st)) {
-            set_or_throw(m_ec, ec, "create_directories", p);
-            return false;
-        }
-        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, std::error_code *ec)
-{
-    if (ec) ec->clear();
-    if (::mkdir(p.c_str(), static_cast<int>(perms::all)) == 0)
-        return true;
-    if (errno != EEXIST || !is_directory(p))
-        set_or_throw(ec, "create_directory", p);
-    return false;
-}
-
-bool __create_directory(path const & p, path const & attributes,
-                        std::error_code *ec)
-{
-    struct ::stat attr_stat;
-    std::error_code mec;
-    auto st = detail::posix_stat(attributes, attr_stat, &mec);
-    if (!status_known(st)) {
-        set_or_throw(mec, ec, "create_directory", p, attributes);
-        return false;
-    }
-    if (ec) ec->clear();
-    if (::mkdir(p.c_str(), attr_stat.st_mode) == 0)
-        return true;
-    if (errno != EEXIST || !is_directory(p))
-        set_or_throw(ec, "create_directory", p, attributes);
-    return false;
-}
-
-void __create_directory_symlink(path const & from, path const & to,
-                                std::error_code *ec){
-    if (::symlink(from.c_str(), to.c_str()) != 0)
-        set_or_throw(ec, "create_directory_symlink", from, to);
-    else if (ec)
-        ec->clear();
-}
-
-void __create_hard_link(const path& from, const path& to, std::error_code *ec){
-    if (::link(from.c_str(), to.c_str()) == -1)
-        set_or_throw(ec, "create_hard_link", from, to);
-    else if (ec)
-        ec->clear();
-}
-
-void __create_symlink(path const & from, path const & to, std::error_code *ec) {
-
-    if (::symlink(from.c_str(), to.c_str()) == -1)
-        set_or_throw(ec, "create_symlink", from, to);
-    else if (ec)
-        ec->clear();
-}
-
-path __current_path(std::error_code *ec) {
-    auto size = ::pathconf(".", _PC_PATH_MAX);
-    _LIBCPP_ASSERT(size >= 0, "pathconf returned a 0 as max size");
-
-    auto buff = std::unique_ptr<char[]>(new char[size + 1]);
-    char* ret;
-    if ((ret = ::getcwd(buff.get(), static_cast<size_t>(size))) == nullptr) {
-        set_or_throw(ec, "current_path");
-        return {};
-    }
-    if (ec) ec->clear();
-    return {buff.get()};
-}
-
-void __current_path(const path& p, std::error_code *ec) {
-    if (::chdir(p.c_str()) == -1)
-        set_or_throw(ec, "current_path", p);
-    else if (ec)
-        ec->clear();
-}
-
-bool __equivalent(const path& p1, const path& p2, std::error_code *ec)
-{
-    auto make_unsupported_error = [&]() {
-      set_or_throw(make_error_code(errc::not_supported), ec,
-                     "equivalent", p1, p2);
-      return false;
-    };
-    std::error_code ec1, ec2;
-    struct ::stat st1 = {};
-    struct ::stat st2 = {};
-    auto s1 = detail::posix_stat(p1.native(), st1, &ec1);
-    if (!exists(s1))
-      return make_unsupported_error();
-    auto s2 = detail::posix_stat(p2.native(), st2, &ec2);
-    if (!exists(s2))
-      return make_unsupported_error();
-    if (ec) ec->clear();
-    return (st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino);
-}
-
-
-std::uintmax_t __file_size(const path& p, std::error_code *ec)
-{
-    std::error_code m_ec;
-    struct ::stat st;
-    file_status fst = detail::posix_stat(p, st, &m_ec);
-    if (!exists(fst) || !is_regular_file(fst)) {
-        if (!m_ec)
-            m_ec = make_error_code(errc::not_supported);
-        set_or_throw(m_ec, ec, "file_size", p);
-        return static_cast<uintmax_t>(-1);
-    }
-    // is_regular_file(p) == true
-    if (ec) ec->clear();
-    return static_cast<std::uintmax_t>(st.st_size);
-}
-
-std::uintmax_t __hard_link_count(const path& p, std::error_code *ec)
-{
-    std::error_code m_ec;
-    struct ::stat st;
-    detail::posix_stat(p, st, &m_ec);
-    if (m_ec) {
-        set_or_throw(m_ec, ec, "hard_link_count", p);
-        return static_cast<std::uintmax_t>(-1);
-    }
-    if (ec) ec->clear();
-    return static_cast<std::uintmax_t>(st.st_nlink);
-}
-
-
-bool __fs_is_empty(const path& p, std::error_code *ec)
-{
-    if (ec) ec->clear();
-    std::error_code m_ec;
-    struct ::stat pst;
-    auto st = detail::posix_stat(p, pst, &m_ec);
-    if (m_ec) {
-        set_or_throw(m_ec, ec, "is_empty", p);
-        return false;
-    }
-    else if (!is_directory(st) && !is_regular_file(st)) {
-        m_ec = make_error_code(errc::not_supported);
-        set_or_throw(m_ec, ec, "is_empty");
-        return false;
-    }
-    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<std::uintmax_t>(pst.st_size) == 0;
-
-    _LIBCPP_UNREACHABLE();
-}
-
-
-namespace detail { namespace {
-
-using TimeSpec = struct timespec;
-using StatT =  struct stat;
-
-#if defined(__APPLE__)
-TimeSpec extract_mtime(StatT const& st) { return st.st_mtimespec; }
-__attribute__((unused)) // Suppress warning
-TimeSpec extract_atime(StatT const& st) { return st.st_atimespec; }
-#else
-TimeSpec extract_mtime(StatT const& st) { return st.st_mtim; }
-__attribute__((unused)) // Suppress warning
-TimeSpec extract_atime(StatT const& st) { return st.st_atim; }
-#endif
-
-}} // end namespace detail
-
-using FSTime = fs_time_util<file_time_type, time_t, struct timespec>;
-
-file_time_type __last_write_time(const path& p, std::error_code *ec)
-{
-    using namespace ::std::chrono;
-    std::error_code m_ec;
-    struct ::stat st;
-    detail::posix_stat(p, st, &m_ec);
-    if (m_ec) {
-        set_or_throw(m_ec, ec, "last_write_time", p);
-        return file_time_type::min();
-    }
-    if (ec) ec->clear();
-    auto ts = detail::extract_mtime(st);
-    if (!FSTime::is_representable(ts)) {
-        set_or_throw(error_code(EOVERFLOW, generic_category()), ec,
-                     "last_write_time", p);
-        return file_time_type::min();
-    }
-    return FSTime::convert_timespec(ts);
-}
-
-void __last_write_time(const path& p, file_time_type new_time,
-                       std::error_code *ec)
-{
-    using namespace std::chrono;
-    std::error_code m_ec;
-
-    // We can use the presence of UTIME_OMIT to detect platforms that do not
-    // provide utimensat.
-#if !defined(UTIME_OMIT)
-    // This implementation has a race condition between determining the
-    // last access time and attempting to set it to the same value using
-    // ::utimes
-    struct ::stat st;
-    file_status fst = detail::posix_stat(p, st, &m_ec);
-    if (m_ec && !status_known(fst)) {
-        set_or_throw(m_ec, ec, "last_write_time", p);
-        return;
-    }
-    auto atime = detail::extract_atime(st);
-    struct ::timeval tbuf[2];
-    tbuf[0].tv_sec = atime.tv_sec;
-    tbuf[0].tv_usec = duration_cast<microseconds>(nanoseconds(atime.tv_nsec)).count();
-    const bool overflowed = !FSTime::set_times_checked<microseconds>(
-        &tbuf[1].tv_sec, &tbuf[1].tv_usec, new_time);
-
-    if (overflowed) {
-        set_or_throw(make_error_code(errc::invalid_argument), ec,
-                     "last_write_time", p);
-        return;
-    }
-    if (::utimes(p.c_str(), tbuf) == -1) {
-        m_ec = detail::capture_errno();
-    }
-#else
-    struct ::timespec tbuf[2];
-    tbuf[0].tv_sec = 0;
-    tbuf[0].tv_nsec = UTIME_OMIT;
-
-    const bool overflowed = !FSTime::set_times_checked<nanoseconds>(
-        &tbuf[1].tv_sec, &tbuf[1].tv_nsec, new_time);
-    if (overflowed) {
-        set_or_throw(make_error_code(errc::invalid_argument),
-            ec, "last_write_time", p);
-        return;
-    }
-    if (::utimensat(AT_FDCWD, p.c_str(), tbuf, 0) == -1) {
-        m_ec = detail::capture_errno();
-    }
-#endif
-    if (m_ec)
-        set_or_throw(m_ec, ec, "last_write_time", p);
-    else if (ec)
-        ec->clear();
-}
-
-
-void __permissions(const path& p, perms prms, std::error_code *ec)
-{
-
-    const bool resolve_symlinks = !bool(perms::symlink_nofollow & prms);
-    const bool add_perms = bool(perms::add_perms & prms);
-    const bool remove_perms = bool(perms::remove_perms & prms);
-    _LIBCPP_ASSERT(!(add_perms && remove_perms),
-                   "Both add_perms and remove_perms are set");
-
-    bool set_sym_perms = false;
-    prms &= perms::mask;
-    if (!resolve_symlinks || (add_perms || remove_perms)) {
-        std::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 set_or_throw(m_ec, ec, "permissions", p);
-        _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 set_or_throw(ec, "permissions", p);
-    }
-# else
-    if (set_sym_perms)
-        return set_or_throw(make_error_code(errc::operation_not_supported),
-                            ec, "permissions", p);
-    if (::chmod(p.c_str(), real_perms) == -1) {
-        return set_or_throw(ec, "permissions", p);
-    }
-# endif
-    if (ec) ec->clear();
-}
-
-
-path __read_symlink(const path& p, std::error_code *ec) {
-    char buff[PATH_MAX + 1];
-    std::error_code m_ec;
-    ::ssize_t ret;
-    if ((ret = ::readlink(p.c_str(), buff, PATH_MAX)) == -1) {
-        set_or_throw(ec, "read_symlink", p);
-        return {};
-    }
-    _LIBCPP_ASSERT(ret <= PATH_MAX, "TODO");
-    _LIBCPP_ASSERT(ret > 0, "TODO");
-    if (ec) ec->clear();
-    buff[ret] = 0;
-    return {buff};
-}
-
-
-bool __remove(const path& p, std::error_code *ec) {
-    if (ec) ec->clear();
-    if (::remove(p.c_str()) == -1) {
-        set_or_throw(ec, "remove", p);
-        return false;
-    }
-    return true;
-}
-
-namespace {
-
-std::uintmax_t remove_all_impl(path const & p, std::error_code& ec)
-{
-    const auto npos = static_cast<std::uintmax_t>(-1);
-    const file_status st = __symlink_status(p, &ec);
-    if (ec) return npos;
-     std::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
-
-std::uintmax_t __remove_all(const path& p, std::error_code *ec) {
-    std::error_code mec;
-    auto count = remove_all_impl(p, mec);
-    if (mec) {
-        set_or_throw(mec, ec, "remove_all", p);
-        return static_cast<std::uintmax_t>(-1);
-    }
-    if (ec) ec->clear();
-    return count;
-}
-
-void __rename(const path& from, const path& to, std::error_code *ec) {
-    if (::rename(from.c_str(), to.c_str()) == -1)
-        set_or_throw(ec, "rename", from, to);
-    else if (ec)
-        ec->clear();
-}
-
-void __resize_file(const path& p, std::uintmax_t size, std::error_code *ec) {
-    if (::truncate(p.c_str(), static_cast<::off_t>(size)) == -1)
-        set_or_throw(ec, "resize_file", p);
-    else if (ec)
-        ec->clear();
-}
-
-space_info __space(const path& p, std::error_code *ec) {
-    space_info si;
-    struct statvfs m_svfs = {};
-    if (::statvfs(p.c_str(), &m_svfs) == -1)  {
-        set_or_throw(ec, "space", p);
-        si.capacity = si.free = si.available =
-            static_cast<std::uintmax_t>(-1);
-        return si;
-    }
-    if (ec) ec->clear();
-    // Multiply with overflow checking.
-    auto do_mult = [&](std::uintmax_t& out, std::uintmax_t other) {
-      out = other * m_svfs.f_frsize;
-      if (other == 0 || out / other != m_svfs.f_frsize)
-          out = static_cast<std::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, std::error_code *ec) {
-    return detail::posix_stat(p, ec);
-}
-
-file_status __symlink_status(const path& p, std::error_code *ec) {
-    return detail::posix_lstat(p, ec);
-}
-
-path __system_complete(const path& p, std::error_code *ec) {
-    if (ec) ec->clear();
-    return absolute(p, current_path());
-}
-
-path __temp_directory_path(std::error_code* ec) {
-  const char* env_paths[] = {"TMPDIR", "TMP", "TEMP", "TEMPDIR"};
-  const char* ret = nullptr;
-
-  for (auto& ep : env_paths)
-    if ((ret = std::getenv(ep)))
-      break;
-  if (ret == nullptr)
-    ret = "/tmp";
-
-  path p(ret);
-  std::error_code m_ec;
-  if (!exists(p, m_ec) || !is_directory(p, m_ec)) {
-    if (!m_ec || m_ec == make_error_code(errc::no_such_file_or_directory))
-      m_ec = make_error_code(errc::not_a_directory);
-    set_or_throw(m_ec, ec, "temp_directory_path");
-    return {};
-  }
-
-  if (ec)
-    ec->clear();
-  return p;
-}
-
-// An absolute path is composed according to the table in [fs.op.absolute].
-path absolute(const path& p, const path& base) {
-    auto root_name = p.root_name();
-    auto root_dir = p.root_directory();
-
-    if (!root_name.empty() && !root_dir.empty())
-      return p;
-
-    auto abs_base = base.is_absolute() ? base : absolute(base);
-
-    /* !has_root_name && !has_root_dir */
-    if (root_name.empty() && root_dir.empty())
-    {
-      return abs_base / p;
-    }
-    else if (!root_name.empty()) /* has_root_name && !has_root_dir */
-    {
-      return  root_name / abs_base.root_directory()
-              /
-              abs_base.relative_path() / p.relative_path();
-    }
-    else /* !has_root_name && has_root_dir */
-    {
-      if (abs_base.has_root_name())
-        return abs_base.root_name() / p;
-      // else p is absolute,  return outside of block
-    }
-    return p;
-}
-
-_LIBCPP_END_NAMESPACE_EXPERIMENTAL_FILESYSTEM