| //===--------------------- 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 "filesystem" |
| #include "array" |
| #include "iterator" |
| #include "fstream" |
| #include "random" /* for unique_path */ |
| #include "string_view" |
| #include "type_traits" |
| #include "vector" |
| #include "cstdlib" |
| #include "climits" |
| |
| #include "filesystem_common.h" |
| |
| #include <unistd.h> |
| #include <sys/stat.h> |
| #include <sys/statvfs.h> |
| #include <time.h> |
| #include <fcntl.h> /* values for fchmodat */ |
| |
| #if defined(__linux__) |
| #include <linux/version.h> |
| #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 33) |
| #include <sys/sendfile.h> |
| #define _LIBCPP_USE_SENDFILE |
| #endif |
| #elif defined(__APPLE__) || __has_include(<copyfile.h>) |
| #include <copyfile.h> |
| #define _LIBCPP_USE_COPYFILE |
| #endif |
| |
| #if !defined(__APPLE__) |
| #define _LIBCPP_USE_CLOCK_GETTIME |
| #endif |
| |
| #if !defined(CLOCK_REALTIME) || !defined(_LIBCPP_USE_CLOCK_GETTIME) |
| #include <sys/time.h> // for gettimeofday and timeval |
| #endif // !defined(CLOCK_REALTIME) |
| |
| #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); |
| } |
| |
| bool posix_ftruncate(const FileDescriptor& fd, size_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); |
| char buff[PATH_MAX + 1]; |
| char* ret; |
| if ((ret = ::realpath(p.c_str(), buff)) == nullptr) |
| return err.report(capture_errno()); |
| return {ret}; |
| } |
| |
| 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); |
| |
| char buff[PATH_MAX + 1]; |
| error_code m_ec; |
| ::ssize_t ret; |
| if ((ret = ::readlink(p.c_str(), buff, PATH_MAX)) == -1) { |
| return err.report(capture_errno()); |
| } |
| _LIBCPP_ASSERT(ret <= PATH_MAX, "TODO"); |
| _LIBCPP_ASSERT(ret > 0, "TODO"); |
| buff[ret] = 0; |
| return {buff}; |
| } |
| |
| 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 |