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 TimeValue file_status::getLastModificationTime() const {
156 UI.LowPart = LastWriteTimeLow;
157 UI.HighPart = LastWriteTimeHigh;
160 Ret.fromWin32Time(UI.QuadPart);
164 std::error_code current_path(SmallVectorImpl<char> &result) {
165 SmallVector<wchar_t, MAX_PATH> cur_path;
166 DWORD len = MAX_PATH;
169 cur_path.reserve(len);
170 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
172 // A zero return value indicates a failure other than insufficient space.
174 return mapWindowsError(::GetLastError());
176 // If there's insufficient space, the len returned is larger than the len
178 } while (len > cur_path.capacity());
180 // On success, GetCurrentDirectoryW returns the number of characters not
181 // including the null-terminator.
182 cur_path.set_size(len);
183 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
186 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
188 SmallVector<wchar_t, 128> path_utf16;
190 if (std::error_code ec = widenPath(path, path_utf16))
193 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
194 DWORD LastError = ::GetLastError();
195 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
196 return mapWindowsError(LastError);
199 return std::error_code();
202 // We can't use symbolic links for windows.
203 std::error_code create_link(const Twine &to, const Twine &from) {
204 // Convert to utf-16.
205 SmallVector<wchar_t, 128> wide_from;
206 SmallVector<wchar_t, 128> wide_to;
207 if (std::error_code ec = widenPath(from, wide_from))
209 if (std::error_code ec = widenPath(to, wide_to))
212 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
213 return mapWindowsError(::GetLastError());
215 return std::error_code();
218 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
219 SmallVector<wchar_t, 128> path_utf16;
222 if (std::error_code EC = status(path, ST)) {
223 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
225 return std::error_code();
228 if (std::error_code ec = widenPath(path, path_utf16))
231 if (ST.type() == file_type::directory_file) {
232 if (!::RemoveDirectoryW(c_str(path_utf16))) {
233 std::error_code EC = mapWindowsError(::GetLastError());
234 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
237 return std::error_code();
239 if (!::DeleteFileW(c_str(path_utf16))) {
240 std::error_code EC = mapWindowsError(::GetLastError());
241 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
244 return std::error_code();
247 std::error_code rename(const Twine &from, const Twine &to) {
248 // Convert to utf-16.
249 SmallVector<wchar_t, 128> wide_from;
250 SmallVector<wchar_t, 128> wide_to;
251 if (std::error_code ec = widenPath(from, wide_from))
253 if (std::error_code ec = widenPath(to, wide_to))
256 std::error_code ec = std::error_code();
258 // Retry while we see ERROR_ACCESS_DENIED.
259 // System scanners (eg. indexer) might open the source file when it is written
262 for (int i = 0; i < 2000; i++) {
263 // Try ReplaceFile first, as it is able to associate a new data stream with
264 // the destination even if the destination file is currently open.
265 if (::ReplaceFileW(wide_to.begin(), wide_from.begin(), NULL, 0, NULL, NULL))
266 return std::error_code();
268 // We get ERROR_FILE_NOT_FOUND if the destination file is missing.
269 // MoveFileEx can handle this case.
270 DWORD ReplaceError = ::GetLastError();
271 ec = mapWindowsError(ReplaceError);
272 if (ReplaceError != ERROR_ACCESS_DENIED &&
273 ReplaceError != ERROR_FILE_NOT_FOUND &&
274 ReplaceError != ERROR_SHARING_VIOLATION)
277 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
278 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
279 return std::error_code();
281 DWORD MoveError = ::GetLastError();
282 ec = mapWindowsError(MoveError);
283 if (MoveError != ERROR_ACCESS_DENIED) break;
291 std::error_code resize_file(int FD, uint64_t Size) {
292 #ifdef HAVE__CHSIZE_S
293 errno_t error = ::_chsize_s(FD, Size);
295 errno_t error = ::_chsize(FD, Size);
297 return std::error_code(error, std::generic_category());
300 std::error_code access(const Twine &Path, AccessMode Mode) {
301 SmallVector<wchar_t, 128> PathUtf16;
303 if (std::error_code EC = widenPath(Path, PathUtf16))
306 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
308 if (Attributes == INVALID_FILE_ATTRIBUTES) {
309 // See if the file didn't actually exist.
310 DWORD LastError = ::GetLastError();
311 if (LastError != ERROR_FILE_NOT_FOUND &&
312 LastError != ERROR_PATH_NOT_FOUND)
313 return mapWindowsError(LastError);
314 return errc::no_such_file_or_directory;
317 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
318 return errc::permission_denied;
320 return std::error_code();
323 bool can_execute(const Twine &Path) {
324 return !access(Path, AccessMode::Execute) ||
325 !access(Path + ".exe", AccessMode::Execute);
328 bool equivalent(file_status A, file_status B) {
329 assert(status_known(A) && status_known(B));
330 return A.FileIndexHigh == B.FileIndexHigh &&
331 A.FileIndexLow == B.FileIndexLow &&
332 A.FileSizeHigh == B.FileSizeHigh &&
333 A.FileSizeLow == B.FileSizeLow &&
334 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
335 A.LastWriteTimeLow == B.LastWriteTimeLow &&
336 A.VolumeSerialNumber == B.VolumeSerialNumber;
339 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
340 file_status fsA, fsB;
341 if (std::error_code ec = status(A, fsA))
343 if (std::error_code ec = status(B, fsB))
345 result = equivalent(fsA, fsB);
346 return std::error_code();
349 static bool isReservedName(StringRef path) {
350 // This list of reserved names comes from MSDN, at:
351 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
352 static const char *const sReservedNames[] = { "nul", "con", "prn", "aux",
353 "com1", "com2", "com3", "com4",
354 "com5", "com6", "com7", "com8",
355 "com9", "lpt1", "lpt2", "lpt3",
356 "lpt4", "lpt5", "lpt6", "lpt7",
359 // First, check to see if this is a device namespace, which always
360 // starts with \\.\, since device namespaces are not legal file paths.
361 if (path.startswith("\\\\.\\"))
364 // Then compare against the list of ancient reserved names
365 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
366 if (path.equals_lower(sReservedNames[i]))
370 // The path isn't what we consider reserved.
374 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
375 if (FileHandle == INVALID_HANDLE_VALUE)
376 goto handle_status_error;
378 switch (::GetFileType(FileHandle)) {
380 llvm_unreachable("Don't know anything about this file type");
381 case FILE_TYPE_UNKNOWN: {
382 DWORD Err = ::GetLastError();
384 return mapWindowsError(Err);
385 Result = file_status(file_type::type_unknown);
386 return std::error_code();
391 Result = file_status(file_type::character_file);
392 return std::error_code();
394 Result = file_status(file_type::fifo_file);
395 return std::error_code();
398 BY_HANDLE_FILE_INFORMATION Info;
399 if (!::GetFileInformationByHandle(FileHandle, &Info))
400 goto handle_status_error;
403 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
404 ? file_type::directory_file
405 : file_type::regular_file;
407 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
408 Info.ftLastWriteTime.dwLowDateTime,
409 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
410 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
411 return std::error_code();
415 DWORD LastError = ::GetLastError();
416 if (LastError == ERROR_FILE_NOT_FOUND ||
417 LastError == ERROR_PATH_NOT_FOUND)
418 Result = file_status(file_type::file_not_found);
419 else if (LastError == ERROR_SHARING_VIOLATION)
420 Result = file_status(file_type::type_unknown);
422 Result = file_status(file_type::status_error);
423 return mapWindowsError(LastError);
426 std::error_code status(const Twine &path, file_status &result) {
427 SmallString<128> path_storage;
428 SmallVector<wchar_t, 128> path_utf16;
430 StringRef path8 = path.toStringRef(path_storage);
431 if (isReservedName(path8)) {
432 result = file_status(file_type::character_file);
433 return std::error_code();
436 if (std::error_code ec = widenPath(path8, path_utf16))
439 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
440 if (attr == INVALID_FILE_ATTRIBUTES)
441 return getStatus(INVALID_HANDLE_VALUE, result);
443 // Handle reparse points.
444 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
446 ::CreateFileW(path_utf16.begin(),
447 0, // Attributes only.
448 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
451 FILE_FLAG_BACKUP_SEMANTICS,
454 return getStatus(INVALID_HANDLE_VALUE, result);
458 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
459 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
460 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
462 return getStatus(INVALID_HANDLE_VALUE, result);
464 return getStatus(h, result);
467 std::error_code status(int FD, file_status &Result) {
468 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
469 return getStatus(FileHandle, Result);
472 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
474 UI.QuadPart = Time.toWin32Time();
476 FT.dwLowDateTime = UI.LowPart;
477 FT.dwHighDateTime = UI.HighPart;
478 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
479 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
480 return mapWindowsError(::GetLastError());
481 return std::error_code();
484 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
486 // Make sure that the requested size fits within SIZE_T.
487 if (Size > std::numeric_limits<SIZE_T>::max())
488 return make_error_code(errc::invalid_argument);
490 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
491 if (FileHandle == INVALID_HANDLE_VALUE)
492 return make_error_code(errc::bad_file_descriptor);
496 case readonly: flprotect = PAGE_READONLY; break;
497 case readwrite: flprotect = PAGE_READWRITE; break;
498 case priv: flprotect = PAGE_WRITECOPY; break;
501 HANDLE FileMappingHandle =
502 ::CreateFileMappingW(FileHandle, 0, flprotect,
503 (Offset + Size) >> 32,
504 (Offset + Size) & 0xffffffff,
506 if (FileMappingHandle == NULL) {
507 std::error_code ec = mapWindowsError(GetLastError());
511 DWORD dwDesiredAccess;
513 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
514 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
515 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
517 Mapping = ::MapViewOfFile(FileMappingHandle,
522 if (Mapping == NULL) {
523 std::error_code ec = mapWindowsError(GetLastError());
524 ::CloseHandle(FileMappingHandle);
529 MEMORY_BASIC_INFORMATION mbi;
530 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
532 std::error_code ec = mapWindowsError(GetLastError());
533 ::UnmapViewOfFile(Mapping);
534 ::CloseHandle(FileMappingHandle);
537 Size = mbi.RegionSize;
540 // Close all the handles except for the view. It will keep the other handles
542 ::CloseHandle(FileMappingHandle);
543 return std::error_code();
546 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
547 uint64_t offset, std::error_code &ec)
548 : Size(length), Mapping() {
549 ec = init(fd, offset, mode);
554 mapped_file_region::~mapped_file_region() {
556 ::UnmapViewOfFile(Mapping);
559 uint64_t mapped_file_region::size() const {
560 assert(Mapping && "Mapping failed but used anyway!");
564 char *mapped_file_region::data() const {
565 assert(Mapping && "Mapping failed but used anyway!");
566 return reinterpret_cast<char*>(Mapping);
569 const char *mapped_file_region::const_data() const {
570 assert(Mapping && "Mapping failed but used anyway!");
571 return reinterpret_cast<const char*>(Mapping);
574 int mapped_file_region::alignment() {
576 ::GetSystemInfo(&SysInfo);
577 return SysInfo.dwAllocationGranularity;
580 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
582 SmallVector<wchar_t, 128> path_utf16;
584 if (std::error_code ec = widenPath(path, path_utf16))
587 // Convert path to the format that Windows is happy with.
588 if (path_utf16.size() > 0 &&
589 !is_separator(path_utf16[path.size() - 1]) &&
590 path_utf16[path.size() - 1] != L':') {
591 path_utf16.push_back(L'\\');
592 path_utf16.push_back(L'*');
594 path_utf16.push_back(L'*');
597 // Get the first directory entry.
598 WIN32_FIND_DATAW FirstFind;
599 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
601 return mapWindowsError(::GetLastError());
603 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
604 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
605 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
606 FirstFind.cFileName[1] == L'.'))
607 if (!::FindNextFileW(FindHandle, &FirstFind)) {
608 DWORD LastError = ::GetLastError();
610 if (LastError == ERROR_NO_MORE_FILES)
611 return detail::directory_iterator_destruct(it);
612 return mapWindowsError(LastError);
614 FilenameLen = ::wcslen(FirstFind.cFileName);
616 // Construct the current directory entry.
617 SmallString<128> directory_entry_name_utf8;
618 if (std::error_code ec =
619 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
620 directory_entry_name_utf8))
623 it.IterationHandle = intptr_t(FindHandle.take());
624 SmallString<128> directory_entry_path(path);
625 path::append(directory_entry_path, directory_entry_name_utf8);
626 it.CurrentEntry = directory_entry(directory_entry_path);
628 return std::error_code();
631 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
632 if (it.IterationHandle != 0)
633 // Closes the handle if it's valid.
634 ScopedFindHandle close(HANDLE(it.IterationHandle));
635 it.IterationHandle = 0;
636 it.CurrentEntry = directory_entry();
637 return std::error_code();
640 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
641 WIN32_FIND_DATAW FindData;
642 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
643 DWORD LastError = ::GetLastError();
645 if (LastError == ERROR_NO_MORE_FILES)
646 return detail::directory_iterator_destruct(it);
647 return mapWindowsError(LastError);
650 size_t FilenameLen = ::wcslen(FindData.cFileName);
651 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
652 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
653 FindData.cFileName[1] == L'.'))
654 return directory_iterator_increment(it);
656 SmallString<128> directory_entry_path_utf8;
657 if (std::error_code ec =
658 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
659 directory_entry_path_utf8))
662 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
663 return std::error_code();
666 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
667 SmallVector<wchar_t, 128> PathUTF16;
669 if (std::error_code EC = widenPath(Name, PathUTF16))
673 ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
674 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
675 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
676 if (H == INVALID_HANDLE_VALUE) {
677 DWORD LastError = ::GetLastError();
678 std::error_code EC = mapWindowsError(LastError);
679 // Provide a better error message when trying to open directories.
680 // This only runs if we failed to open the file, so there is probably
681 // no performances issues.
682 if (LastError != ERROR_ACCESS_DENIED)
684 if (is_directory(Name))
685 return make_error_code(errc::is_a_directory);
689 int FD = ::_open_osfhandle(intptr_t(H), 0);
692 return mapWindowsError(ERROR_INVALID_HANDLE);
696 return std::error_code();
699 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
700 sys::fs::OpenFlags Flags, unsigned Mode) {
701 // Verify that we don't have both "append" and "excl".
702 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
703 "Cannot specify both 'excl' and 'append' file creation flags!");
705 SmallVector<wchar_t, 128> PathUTF16;
707 if (std::error_code EC = widenPath(Name, PathUTF16))
710 DWORD CreationDisposition;
712 CreationDisposition = CREATE_NEW;
713 else if (Flags & F_Append)
714 CreationDisposition = OPEN_ALWAYS;
716 CreationDisposition = CREATE_ALWAYS;
718 DWORD Access = GENERIC_WRITE;
720 Access |= GENERIC_READ;
722 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
723 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
724 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
726 if (H == INVALID_HANDLE_VALUE) {
727 DWORD LastError = ::GetLastError();
728 std::error_code EC = mapWindowsError(LastError);
729 // Provide a better error message when trying to open directories.
730 // This only runs if we failed to open the file, so there is probably
731 // no performances issues.
732 if (LastError != ERROR_ACCESS_DENIED)
734 if (is_directory(Name))
735 return make_error_code(errc::is_a_directory);
740 if (Flags & F_Append)
741 OpenFlags |= _O_APPEND;
744 OpenFlags |= _O_TEXT;
746 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
749 return mapWindowsError(ERROR_INVALID_HANDLE);
753 return std::error_code();
755 } // end namespace fs
758 static bool getKnownFolderPath(KNOWNFOLDERID folderId,
759 SmallVectorImpl<char> &result) {
760 wchar_t *path = nullptr;
761 if (::SHGetKnownFolderPath(folderId, KF_FLAG_CREATE, nullptr, &path) != S_OK)
764 bool ok = !UTF16ToUTF8(path, ::wcslen(path), result);
765 ::CoTaskMemFree(path);
769 bool getUserCacheDir(SmallVectorImpl<char> &Result) {
770 return getKnownFolderPath(FOLDERID_LocalAppData, Result);
773 bool home_directory(SmallVectorImpl<char> &result) {
774 return getKnownFolderPath(FOLDERID_Profile, result);
777 static bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) {
778 SmallVector<wchar_t, 1024> Buf;
782 Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity());
786 // Try again with larger buffer.
787 } while (Size > Buf.capacity());
790 return !windows::UTF16ToUTF8(Buf.data(), Size, Res);
793 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
794 const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"};
795 for (auto *Env : EnvironmentVariables) {
796 if (getTempDirEnvVar(Env, Res))
802 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
803 (void)ErasedOnReboot;
806 // Check whether the temporary directory is specified by an environment var.
807 // This matches GetTempPath logic to some degree. GetTempPath is not used
808 // directly as it cannot handle evn var longer than 130 chars on Windows 7
809 // (fixed on Windows 8).
810 if (getTempDirEnvVar(Result)) {
811 assert(!Result.empty() && "Unexpected empty path");
812 native(Result); // Some Unix-like shells use Unix path separator in $TMP.
813 fs::make_absolute(Result); // Make it absolute if not already.
817 // Fall back to a system default.
818 const char *DefaultResult = "C:\\Temp";
819 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
821 } // end namespace path
824 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
825 llvm::SmallVectorImpl<wchar_t> &utf16) {
827 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
828 utf8.size(), utf16.begin(), 0);
831 return mapWindowsError(::GetLastError());
833 utf16.reserve(len + 1);
836 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
837 utf8.size(), utf16.begin(), utf16.size());
840 return mapWindowsError(::GetLastError());
843 // Make utf16 null terminated.
847 return std::error_code();
851 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
853 llvm::SmallVectorImpl<char> &utf8) {
856 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
860 return mapWindowsError(::GetLastError());
865 // Now do the actual conversion.
866 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
867 utf8.size(), NULL, NULL);
870 return mapWindowsError(::GetLastError());
873 // Make utf8 null terminated.
877 return std::error_code();
880 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
881 llvm::SmallVectorImpl<char> &utf8) {
882 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
885 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
886 llvm::SmallVectorImpl<char> &utf8) {
887 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
889 } // end namespace windows
890 } // end namespace sys
891 } // end namespace llvm