1 //===- llvm/Support/Windows/Path.inc - Windows Path Impl --------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Windows specific implementation of the Path API.
12 //===----------------------------------------------------------------------===//
14 //===----------------------------------------------------------------------===//
15 //=== WARNING: Implementation here must contain only generic Windows code that
16 //=== is guaranteed to work on *all* Windows variants.
17 //===----------------------------------------------------------------------===//
19 #include "llvm/ADT/STLExtras.h"
20 #include "llvm/Support/WindowsError.h"
24 #include <sys/types.h>
26 // These two headers must be included last, and make sure shlobj is required
27 // after Windows.h to make sure it picks up our definition of _WIN32_WINNT
28 #include "WindowsSupport.h"
33 // MinGW doesn't define this.
34 #ifndef _ERRNO_T_DEFINED
35 #define _ERRNO_T_DEFINED
40 # pragma comment(lib, "advapi32.lib") // This provides CryptAcquireContextW.
41 # pragma comment(lib, "ole32.lib") // This provides CoTaskMemFree
46 using llvm::sys::windows::UTF8ToUTF16;
47 using llvm::sys::windows::UTF16ToUTF8;
48 using llvm::sys::path::widenPath;
50 static bool is_separator(const wchar_t value) {
64 // Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the
65 // path is longer than CreateDirectory can tolerate, make it absolute and
66 // prefixed by '\\?\'.
67 std::error_code widenPath(const Twine &Path8,
68 SmallVectorImpl<wchar_t> &Path16) {
69 const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename.
71 // Several operations would convert Path8 to SmallString; more efficient to
72 // do it once up front.
73 SmallString<128> Path8Str;
74 Path8.toVector(Path8Str);
76 // If we made this path absolute, how much longer would it get?
78 if (llvm::sys::path::is_absolute(Twine(Path8Str)))
79 CurPathLen = 0; // No contribution from current_path needed.
81 CurPathLen = ::GetCurrentDirectoryW(0, NULL);
83 return mapWindowsError(::GetLastError());
86 // Would the absolute path be longer than our limit?
87 if ((Path8Str.size() + CurPathLen) >= MaxDirLen &&
88 !Path8Str.startswith("\\\\?\\")) {
89 SmallString<2*MAX_PATH> FullPath("\\\\?\\");
91 SmallString<80> CurPath;
92 if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
94 FullPath.append(CurPath);
96 // Traverse the requested path, canonicalizing . and .. as we go (because
97 // the \\?\ prefix is documented to treat them as real components).
98 // The iterators don't report separators and append() always attaches
99 // preferred_separator so we don't need to call native() on the result.
100 for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str),
101 E = llvm::sys::path::end(Path8Str);
103 if (I->size() == 1 && *I == ".")
105 if (I->size() == 2 && *I == "..")
106 llvm::sys::path::remove_filename(FullPath);
108 llvm::sys::path::append(FullPath, *I);
110 return UTF8ToUTF16(FullPath, Path16);
113 // Just use the caller's original path.
114 return UTF8ToUTF16(Path8Str, Path16);
116 } // end namespace path
120 std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
121 SmallVector<wchar_t, MAX_PATH> PathName;
122 DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
124 // A zero return value indicates a failure other than insufficient space.
128 // Insufficient space is determined by a return value equal to the size of
129 // the buffer passed in.
130 if (Size == PathName.capacity())
133 // On success, GetModuleFileNameW returns the number of characters written to
134 // the buffer not including the NULL terminator.
135 PathName.set_size(Size);
137 // Convert the result from UTF-16 to UTF-8.
138 SmallVector<char, MAX_PATH> PathNameUTF8;
139 if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
142 return std::string(PathNameUTF8.data());
145 UniqueID file_status::getUniqueID() const {
146 // The file is uniquely identified by the volume serial number along
147 // with the 64-bit file identifier.
148 uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
149 static_cast<uint64_t>(FileIndexLow);
151 return UniqueID(VolumeSerialNumber, FileID);
154 ErrorOr<space_info> disk_space(const Twine &Path) {
155 ULARGE_INTEGER Avail, Total, Free;
156 if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free))
157 return mapWindowsError(::GetLastError());
158 space_info SpaceInfo;
160 (static_cast<uint64_t>(Total.HighPart) << 32) + Total.LowPart;
161 SpaceInfo.free = (static_cast<uint64_t>(Free.HighPart) << 32) + Free.LowPart;
162 SpaceInfo.available =
163 (static_cast<uint64_t>(Avail.HighPart) << 32) + Avail.LowPart;
167 TimePoint<> file_status::getLastAccessedTime() const {
169 Time.dwLowDateTime = LastAccessedTimeLow;
170 Time.dwHighDateTime = LastAccessedTimeHigh;
171 return toTimePoint(Time);
174 TimePoint<> file_status::getLastModificationTime() const {
176 Time.dwLowDateTime = LastWriteTimeLow;
177 Time.dwHighDateTime = LastWriteTimeHigh;
178 return toTimePoint(Time);
181 std::error_code current_path(SmallVectorImpl<char> &result) {
182 SmallVector<wchar_t, MAX_PATH> cur_path;
183 DWORD len = MAX_PATH;
186 cur_path.reserve(len);
187 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
189 // A zero return value indicates a failure other than insufficient space.
191 return mapWindowsError(::GetLastError());
193 // If there's insufficient space, the len returned is larger than the len
195 } while (len > cur_path.capacity());
197 // On success, GetCurrentDirectoryW returns the number of characters not
198 // including the null-terminator.
199 cur_path.set_size(len);
200 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
203 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
205 SmallVector<wchar_t, 128> path_utf16;
207 if (std::error_code ec = widenPath(path, path_utf16))
210 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
211 DWORD LastError = ::GetLastError();
212 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
213 return mapWindowsError(LastError);
216 return std::error_code();
219 // We can't use symbolic links for windows.
220 std::error_code create_link(const Twine &to, const Twine &from) {
221 // Convert to utf-16.
222 SmallVector<wchar_t, 128> wide_from;
223 SmallVector<wchar_t, 128> wide_to;
224 if (std::error_code ec = widenPath(from, wide_from))
226 if (std::error_code ec = widenPath(to, wide_to))
229 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
230 return mapWindowsError(::GetLastError());
232 return std::error_code();
235 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
236 SmallVector<wchar_t, 128> path_utf16;
239 if (std::error_code EC = status(path, ST)) {
240 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
242 return std::error_code();
245 if (std::error_code ec = widenPath(path, path_utf16))
248 if (ST.type() == file_type::directory_file) {
249 if (!::RemoveDirectoryW(c_str(path_utf16))) {
250 std::error_code EC = mapWindowsError(::GetLastError());
251 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
254 return std::error_code();
256 if (!::DeleteFileW(c_str(path_utf16))) {
257 std::error_code EC = mapWindowsError(::GetLastError());
258 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
261 return std::error_code();
264 std::error_code rename(const Twine &from, const Twine &to) {
265 // Convert to utf-16.
266 SmallVector<wchar_t, 128> wide_from;
267 SmallVector<wchar_t, 128> wide_to;
268 if (std::error_code ec = widenPath(from, wide_from))
270 if (std::error_code ec = widenPath(to, wide_to))
273 std::error_code ec = std::error_code();
275 // Retry while we see recoverable errors.
276 // System scanners (eg. indexer) might open the source file when it is written
279 bool TryReplace = true;
281 for (int i = 0; i < 2000; i++) {
286 // Try ReplaceFile first, as it is able to associate a new data stream
287 // with the destination even if the destination file is currently open.
288 if (::ReplaceFileW(wide_to.data(), wide_from.data(), NULL, 0, NULL, NULL))
289 return std::error_code();
291 DWORD ReplaceError = ::GetLastError();
292 ec = mapWindowsError(ReplaceError);
294 // If ReplaceFileW returned ERROR_UNABLE_TO_MOVE_REPLACEMENT or
295 // ERROR_UNABLE_TO_MOVE_REPLACEMENT_2, retry but only use MoveFileExW().
296 if (ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT ||
297 ReplaceError == ERROR_UNABLE_TO_MOVE_REPLACEMENT_2) {
301 // If ReplaceFileW returned ERROR_UNABLE_TO_REMOVE_REPLACED, retry
302 // using ReplaceFileW().
303 if (ReplaceError == ERROR_UNABLE_TO_REMOVE_REPLACED)
305 // We get ERROR_FILE_NOT_FOUND if the destination file is missing.
306 // MoveFileEx can handle this case.
307 if (ReplaceError != ERROR_ACCESS_DENIED &&
308 ReplaceError != ERROR_FILE_NOT_FOUND &&
309 ReplaceError != ERROR_SHARING_VIOLATION)
313 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
314 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
315 return std::error_code();
317 DWORD MoveError = ::GetLastError();
318 ec = mapWindowsError(MoveError);
319 if (MoveError != ERROR_ACCESS_DENIED) break;
325 std::error_code resize_file(int FD, uint64_t Size) {
326 #ifdef HAVE__CHSIZE_S
327 errno_t error = ::_chsize_s(FD, Size);
329 errno_t error = ::_chsize(FD, Size);
331 return std::error_code(error, std::generic_category());
334 std::error_code access(const Twine &Path, AccessMode Mode) {
335 SmallVector<wchar_t, 128> PathUtf16;
337 if (std::error_code EC = widenPath(Path, PathUtf16))
340 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
342 if (Attributes == INVALID_FILE_ATTRIBUTES) {
343 // See if the file didn't actually exist.
344 DWORD LastError = ::GetLastError();
345 if (LastError != ERROR_FILE_NOT_FOUND &&
346 LastError != ERROR_PATH_NOT_FOUND)
347 return mapWindowsError(LastError);
348 return errc::no_such_file_or_directory;
351 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
352 return errc::permission_denied;
354 return std::error_code();
357 bool can_execute(const Twine &Path) {
358 return !access(Path, AccessMode::Execute) ||
359 !access(Path + ".exe", AccessMode::Execute);
362 bool equivalent(file_status A, file_status B) {
363 assert(status_known(A) && status_known(B));
364 return A.FileIndexHigh == B.FileIndexHigh &&
365 A.FileIndexLow == B.FileIndexLow &&
366 A.FileSizeHigh == B.FileSizeHigh &&
367 A.FileSizeLow == B.FileSizeLow &&
368 A.LastAccessedTimeHigh == B.LastAccessedTimeHigh &&
369 A.LastAccessedTimeLow == B.LastAccessedTimeLow &&
370 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
371 A.LastWriteTimeLow == B.LastWriteTimeLow &&
372 A.VolumeSerialNumber == B.VolumeSerialNumber;
375 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
376 file_status fsA, fsB;
377 if (std::error_code ec = status(A, fsA))
379 if (std::error_code ec = status(B, fsB))
381 result = equivalent(fsA, fsB);
382 return std::error_code();
385 static bool isReservedName(StringRef path) {
386 // This list of reserved names comes from MSDN, at:
387 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
388 static const char *const sReservedNames[] = { "nul", "con", "prn", "aux",
389 "com1", "com2", "com3", "com4",
390 "com5", "com6", "com7", "com8",
391 "com9", "lpt1", "lpt2", "lpt3",
392 "lpt4", "lpt5", "lpt6", "lpt7",
395 // First, check to see if this is a device namespace, which always
396 // starts with \\.\, since device namespaces are not legal file paths.
397 if (path.startswith("\\\\.\\"))
400 // Then compare against the list of ancient reserved names.
401 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
402 if (path.equals_lower(sReservedNames[i]))
406 // The path isn't what we consider reserved.
410 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
411 if (FileHandle == INVALID_HANDLE_VALUE)
412 goto handle_status_error;
414 switch (::GetFileType(FileHandle)) {
416 llvm_unreachable("Don't know anything about this file type");
417 case FILE_TYPE_UNKNOWN: {
418 DWORD Err = ::GetLastError();
420 return mapWindowsError(Err);
421 Result = file_status(file_type::type_unknown);
422 return std::error_code();
427 Result = file_status(file_type::character_file);
428 return std::error_code();
430 Result = file_status(file_type::fifo_file);
431 return std::error_code();
434 BY_HANDLE_FILE_INFORMATION Info;
435 if (!::GetFileInformationByHandle(FileHandle, &Info))
436 goto handle_status_error;
439 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
440 ? file_type::directory_file
441 : file_type::regular_file;
443 file_status(Type, Info.ftLastAccessTime.dwHighDateTime,
444 Info.ftLastAccessTime.dwLowDateTime,
445 Info.ftLastWriteTime.dwHighDateTime,
446 Info.ftLastWriteTime.dwLowDateTime,
447 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
448 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
449 return std::error_code();
453 DWORD LastError = ::GetLastError();
454 if (LastError == ERROR_FILE_NOT_FOUND ||
455 LastError == ERROR_PATH_NOT_FOUND)
456 Result = file_status(file_type::file_not_found);
457 else if (LastError == ERROR_SHARING_VIOLATION)
458 Result = file_status(file_type::type_unknown);
460 Result = file_status(file_type::status_error);
461 return mapWindowsError(LastError);
464 std::error_code status(const Twine &path, file_status &result) {
465 SmallString<128> path_storage;
466 SmallVector<wchar_t, 128> path_utf16;
468 StringRef path8 = path.toStringRef(path_storage);
469 if (isReservedName(path8)) {
470 result = file_status(file_type::character_file);
471 return std::error_code();
474 if (std::error_code ec = widenPath(path8, path_utf16))
477 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
478 if (attr == INVALID_FILE_ATTRIBUTES)
479 return getStatus(INVALID_HANDLE_VALUE, result);
481 // Handle reparse points.
482 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
484 ::CreateFileW(path_utf16.begin(),
485 0, // Attributes only.
486 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
489 FILE_FLAG_BACKUP_SEMANTICS,
492 return getStatus(INVALID_HANDLE_VALUE, result);
496 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
497 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
498 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
500 return getStatus(INVALID_HANDLE_VALUE, result);
502 return getStatus(h, result);
505 std::error_code status(int FD, file_status &Result) {
506 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
507 return getStatus(FileHandle, Result);
510 std::error_code setLastModificationAndAccessTime(int FD, TimePoint<> Time) {
511 FILETIME FT = toFILETIME(Time);
512 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
513 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
514 return mapWindowsError(::GetLastError());
515 return std::error_code();
518 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
520 // Make sure that the requested size fits within SIZE_T.
521 if (Size > std::numeric_limits<SIZE_T>::max())
522 return make_error_code(errc::invalid_argument);
524 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
525 if (FileHandle == INVALID_HANDLE_VALUE)
526 return make_error_code(errc::bad_file_descriptor);
530 case readonly: flprotect = PAGE_READONLY; break;
531 case readwrite: flprotect = PAGE_READWRITE; break;
532 case priv: flprotect = PAGE_WRITECOPY; break;
535 HANDLE FileMappingHandle =
536 ::CreateFileMappingW(FileHandle, 0, flprotect,
537 (Offset + Size) >> 32,
538 (Offset + Size) & 0xffffffff,
540 if (FileMappingHandle == NULL) {
541 std::error_code ec = mapWindowsError(GetLastError());
545 DWORD dwDesiredAccess;
547 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
548 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
549 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
551 Mapping = ::MapViewOfFile(FileMappingHandle,
556 if (Mapping == NULL) {
557 std::error_code ec = mapWindowsError(GetLastError());
558 ::CloseHandle(FileMappingHandle);
563 MEMORY_BASIC_INFORMATION mbi;
564 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
566 std::error_code ec = mapWindowsError(GetLastError());
567 ::UnmapViewOfFile(Mapping);
568 ::CloseHandle(FileMappingHandle);
571 Size = mbi.RegionSize;
574 // Close all the handles except for the view. It will keep the other handles
576 ::CloseHandle(FileMappingHandle);
577 return std::error_code();
580 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
581 uint64_t offset, std::error_code &ec)
582 : Size(length), Mapping() {
583 ec = init(fd, offset, mode);
588 mapped_file_region::~mapped_file_region() {
590 ::UnmapViewOfFile(Mapping);
593 uint64_t mapped_file_region::size() const {
594 assert(Mapping && "Mapping failed but used anyway!");
598 char *mapped_file_region::data() const {
599 assert(Mapping && "Mapping failed but used anyway!");
600 return reinterpret_cast<char*>(Mapping);
603 const char *mapped_file_region::const_data() const {
604 assert(Mapping && "Mapping failed but used anyway!");
605 return reinterpret_cast<const char*>(Mapping);
608 int mapped_file_region::alignment() {
610 ::GetSystemInfo(&SysInfo);
611 return SysInfo.dwAllocationGranularity;
614 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
616 SmallVector<wchar_t, 128> path_utf16;
618 if (std::error_code ec = widenPath(path, path_utf16))
621 // Convert path to the format that Windows is happy with.
622 if (path_utf16.size() > 0 &&
623 !is_separator(path_utf16[path.size() - 1]) &&
624 path_utf16[path.size() - 1] != L':') {
625 path_utf16.push_back(L'\\');
626 path_utf16.push_back(L'*');
628 path_utf16.push_back(L'*');
631 // Get the first directory entry.
632 WIN32_FIND_DATAW FirstFind;
633 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
635 return mapWindowsError(::GetLastError());
637 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
638 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
639 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
640 FirstFind.cFileName[1] == L'.'))
641 if (!::FindNextFileW(FindHandle, &FirstFind)) {
642 DWORD LastError = ::GetLastError();
644 if (LastError == ERROR_NO_MORE_FILES)
645 return detail::directory_iterator_destruct(it);
646 return mapWindowsError(LastError);
648 FilenameLen = ::wcslen(FirstFind.cFileName);
650 // Construct the current directory entry.
651 SmallString<128> directory_entry_name_utf8;
652 if (std::error_code ec =
653 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
654 directory_entry_name_utf8))
657 it.IterationHandle = intptr_t(FindHandle.take());
658 SmallString<128> directory_entry_path(path);
659 path::append(directory_entry_path, directory_entry_name_utf8);
660 it.CurrentEntry = directory_entry(directory_entry_path);
662 return std::error_code();
665 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
666 if (it.IterationHandle != 0)
667 // Closes the handle if it's valid.
668 ScopedFindHandle close(HANDLE(it.IterationHandle));
669 it.IterationHandle = 0;
670 it.CurrentEntry = directory_entry();
671 return std::error_code();
674 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
675 WIN32_FIND_DATAW FindData;
676 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
677 DWORD LastError = ::GetLastError();
679 if (LastError == ERROR_NO_MORE_FILES)
680 return detail::directory_iterator_destruct(it);
681 return mapWindowsError(LastError);
684 size_t FilenameLen = ::wcslen(FindData.cFileName);
685 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
686 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
687 FindData.cFileName[1] == L'.'))
688 return directory_iterator_increment(it);
690 SmallString<128> directory_entry_path_utf8;
691 if (std::error_code ec =
692 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
693 directory_entry_path_utf8))
696 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
697 return std::error_code();
700 std::error_code openFileForRead(const Twine &Name, int &ResultFD,
701 SmallVectorImpl<char> *RealPath) {
702 SmallVector<wchar_t, 128> PathUTF16;
704 if (std::error_code EC = widenPath(Name, PathUTF16))
708 ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
709 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
710 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
711 if (H == INVALID_HANDLE_VALUE) {
712 DWORD LastError = ::GetLastError();
713 std::error_code EC = mapWindowsError(LastError);
714 // Provide a better error message when trying to open directories.
715 // This only runs if we failed to open the file, so there is probably
716 // no performances issues.
717 if (LastError != ERROR_ACCESS_DENIED)
719 if (is_directory(Name))
720 return make_error_code(errc::is_a_directory);
724 int FD = ::_open_osfhandle(intptr_t(H), 0);
727 return mapWindowsError(ERROR_INVALID_HANDLE);
730 // Fetch the real name of the file, if the user asked
733 wchar_t RealPathUTF16[MAX_PATH];
735 ::GetFinalPathNameByHandleW(H, RealPathUTF16, MAX_PATH,
736 FILE_NAME_NORMALIZED);
737 if (CountChars > 0 && CountChars < MAX_PATH) {
738 // Convert the result from UTF-16 to UTF-8.
739 SmallString<MAX_PATH> RealPathUTF8;
740 if (!UTF16ToUTF8(RealPathUTF16, CountChars, RealPathUTF8))
741 RealPath->append(RealPathUTF8.data(),
742 RealPathUTF8.data() + strlen(RealPathUTF8.data()));
747 return std::error_code();
750 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
751 sys::fs::OpenFlags Flags, unsigned Mode) {
752 // Verify that we don't have both "append" and "excl".
753 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
754 "Cannot specify both 'excl' and 'append' file creation flags!");
756 SmallVector<wchar_t, 128> PathUTF16;
758 if (std::error_code EC = widenPath(Name, PathUTF16))
761 DWORD CreationDisposition;
763 CreationDisposition = CREATE_NEW;
764 else if (Flags & F_Append)
765 CreationDisposition = OPEN_ALWAYS;
767 CreationDisposition = CREATE_ALWAYS;
769 DWORD Access = GENERIC_WRITE;
771 Access |= GENERIC_READ;
773 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
774 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
775 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
777 if (H == INVALID_HANDLE_VALUE) {
778 DWORD LastError = ::GetLastError();
779 std::error_code EC = mapWindowsError(LastError);
780 // Provide a better error message when trying to open directories.
781 // This only runs if we failed to open the file, so there is probably
782 // no performances issues.
783 if (LastError != ERROR_ACCESS_DENIED)
785 if (is_directory(Name))
786 return make_error_code(errc::is_a_directory);
791 if (Flags & F_Append)
792 OpenFlags |= _O_APPEND;
795 OpenFlags |= _O_TEXT;
797 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
800 return mapWindowsError(ERROR_INVALID_HANDLE);
804 return std::error_code();
807 std::error_code getPathFromOpenFD(int FD, SmallVectorImpl<char> &ResultPath) {
808 HANDLE FileHandle = reinterpret_cast<HANDLE>(::_get_osfhandle(FD));
809 if (FileHandle == INVALID_HANDLE_VALUE)
810 return make_error_code(errc::bad_file_descriptor);
813 SmallVector<wchar_t, 1024> TempPath;
815 CharCount = ::GetFinalPathNameByHandleW(FileHandle, TempPath.begin(),
817 FILE_NAME_NORMALIZED);
818 if (CharCount < TempPath.capacity())
821 // Reserve sufficient space for the path as well as the null character. Even
822 // though the API does not document that it is required, if we reserve just
823 // CharCount space, the function call will not store the resulting path and
824 // still report success.
825 TempPath.reserve(CharCount + 1);
829 return mapWindowsError(::GetLastError());
831 TempPath.set_size(CharCount);
833 // On earlier Windows releases, the character count includes the terminating
835 if (TempPath.back() == L'\0') {
840 return windows::UTF16ToUTF8(TempPath.data(), CharCount, ResultPath);
842 } // end namespace fs
845 static bool getKnownFolderPath(KNOWNFOLDERID folderId,
846 SmallVectorImpl<char> &result) {
847 wchar_t *path = nullptr;
848 if (::SHGetKnownFolderPath(folderId, KF_FLAG_CREATE, nullptr, &path) != S_OK)
851 bool ok = !UTF16ToUTF8(path, ::wcslen(path), result);
852 ::CoTaskMemFree(path);
856 bool getUserCacheDir(SmallVectorImpl<char> &Result) {
857 return getKnownFolderPath(FOLDERID_LocalAppData, Result);
860 bool home_directory(SmallVectorImpl<char> &result) {
861 return getKnownFolderPath(FOLDERID_Profile, result);
864 static bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) {
865 SmallVector<wchar_t, 1024> Buf;
869 Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity());
873 // Try again with larger buffer.
874 } while (Size > Buf.capacity());
877 return !windows::UTF16ToUTF8(Buf.data(), Size, Res);
880 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
881 const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"};
882 for (auto *Env : EnvironmentVariables) {
883 if (getTempDirEnvVar(Env, Res))
889 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
890 (void)ErasedOnReboot;
893 // Check whether the temporary directory is specified by an environment var.
894 // This matches GetTempPath logic to some degree. GetTempPath is not used
895 // directly as it cannot handle evn var longer than 130 chars on Windows 7
896 // (fixed on Windows 8).
897 if (getTempDirEnvVar(Result)) {
898 assert(!Result.empty() && "Unexpected empty path");
899 native(Result); // Some Unix-like shells use Unix path separator in $TMP.
900 fs::make_absolute(Result); // Make it absolute if not already.
904 // Fall back to a system default.
905 const char *DefaultResult = "C:\\Temp";
906 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
908 } // end namespace path
911 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
912 llvm::SmallVectorImpl<wchar_t> &utf16) {
914 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
915 utf8.size(), utf16.begin(), 0);
918 return mapWindowsError(::GetLastError());
920 utf16.reserve(len + 1);
923 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
924 utf8.size(), utf16.begin(), utf16.size());
927 return mapWindowsError(::GetLastError());
930 // Make utf16 null terminated.
934 return std::error_code();
938 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
940 llvm::SmallVectorImpl<char> &utf8) {
943 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
947 return mapWindowsError(::GetLastError());
952 // Now do the actual conversion.
953 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
954 utf8.size(), NULL, NULL);
957 return mapWindowsError(::GetLastError());
960 // Make utf8 null terminated.
964 return std::error_code();
967 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
968 llvm::SmallVectorImpl<char> &utf8) {
969 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
972 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
973 llvm::SmallVectorImpl<char> &utf8) {
974 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
977 } // end namespace windows
978 } // end namespace sys
979 } // end namespace llvm