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.
45 using llvm::sys::windows::UTF8ToUTF16;
46 using llvm::sys::windows::UTF16ToUTF8;
47 using llvm::sys::path::widenPath;
49 static bool is_separator(const wchar_t value) {
63 // Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the
64 // path is longer than CreateDirectory can tolerate, make it absolute and
65 // prefixed by '\\?\'.
66 std::error_code widenPath(const Twine &Path8,
67 SmallVectorImpl<wchar_t> &Path16) {
68 const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename.
70 // Several operations would convert Path8 to SmallString; more efficient to
71 // do it once up front.
72 SmallString<128> Path8Str;
73 Path8.toVector(Path8Str);
75 // If we made this path absolute, how much longer would it get?
77 if (llvm::sys::path::is_absolute(Twine(Path8Str)))
78 CurPathLen = 0; // No contribution from current_path needed.
80 CurPathLen = ::GetCurrentDirectoryW(0, NULL);
82 return mapWindowsError(::GetLastError());
85 // Would the absolute path be longer than our limit?
86 if ((Path8Str.size() + CurPathLen) >= MaxDirLen &&
87 !Path8Str.startswith("\\\\?\\")) {
88 SmallString<2*MAX_PATH> FullPath("\\\\?\\");
90 SmallString<80> CurPath;
91 if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
93 FullPath.append(CurPath);
95 // Traverse the requested path, canonicalizing . and .. as we go (because
96 // the \\?\ prefix is documented to treat them as real components).
97 // The iterators don't report separators and append() always attaches
98 // preferred_separator so we don't need to call native() on the result.
99 for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str),
100 E = llvm::sys::path::end(Path8Str);
102 if (I->size() == 1 && *I == ".")
104 if (I->size() == 2 && *I == "..")
105 llvm::sys::path::remove_filename(FullPath);
107 llvm::sys::path::append(FullPath, *I);
109 return UTF8ToUTF16(FullPath, Path16);
112 // Just use the caller's original path.
113 return UTF8ToUTF16(Path8Str, Path16);
115 } // end namespace path
119 std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
120 SmallVector<wchar_t, MAX_PATH> PathName;
121 DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
123 // A zero return value indicates a failure other than insufficient space.
127 // Insufficient space is determined by a return value equal to the size of
128 // the buffer passed in.
129 if (Size == PathName.capacity())
132 // On success, GetModuleFileNameW returns the number of characters written to
133 // the buffer not including the NULL terminator.
134 PathName.set_size(Size);
136 // Convert the result from UTF-16 to UTF-8.
137 SmallVector<char, MAX_PATH> PathNameUTF8;
138 if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
141 return std::string(PathNameUTF8.data());
144 UniqueID file_status::getUniqueID() const {
145 // The file is uniquely identified by the volume serial number along
146 // with the 64-bit file identifier.
147 uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
148 static_cast<uint64_t>(FileIndexLow);
150 return UniqueID(VolumeSerialNumber, FileID);
153 TimeValue file_status::getLastModificationTime() const {
155 UI.LowPart = LastWriteTimeLow;
156 UI.HighPart = LastWriteTimeHigh;
159 Ret.fromWin32Time(UI.QuadPart);
163 std::error_code current_path(SmallVectorImpl<char> &result) {
164 SmallVector<wchar_t, MAX_PATH> cur_path;
165 DWORD len = MAX_PATH;
168 cur_path.reserve(len);
169 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
171 // A zero return value indicates a failure other than insufficient space.
173 return mapWindowsError(::GetLastError());
175 // If there's insufficient space, the len returned is larger than the len
177 } while (len > cur_path.capacity());
179 // On success, GetCurrentDirectoryW returns the number of characters not
180 // including the null-terminator.
181 cur_path.set_size(len);
182 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
185 std::error_code create_directory(const Twine &path, bool IgnoreExisting,
187 SmallVector<wchar_t, 128> path_utf16;
189 if (std::error_code ec = widenPath(path, path_utf16))
192 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
193 DWORD LastError = ::GetLastError();
194 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
195 return mapWindowsError(LastError);
198 return std::error_code();
201 // We can't use symbolic links for windows.
202 std::error_code create_link(const Twine &to, const Twine &from) {
203 // Convert to utf-16.
204 SmallVector<wchar_t, 128> wide_from;
205 SmallVector<wchar_t, 128> wide_to;
206 if (std::error_code ec = widenPath(from, wide_from))
208 if (std::error_code ec = widenPath(to, wide_to))
211 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
212 return mapWindowsError(::GetLastError());
214 return std::error_code();
217 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
218 SmallVector<wchar_t, 128> path_utf16;
221 if (std::error_code EC = status(path, ST)) {
222 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
224 return std::error_code();
227 if (std::error_code ec = widenPath(path, path_utf16))
230 if (ST.type() == file_type::directory_file) {
231 if (!::RemoveDirectoryW(c_str(path_utf16))) {
232 std::error_code EC = mapWindowsError(::GetLastError());
233 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
236 return std::error_code();
238 if (!::DeleteFileW(c_str(path_utf16))) {
239 std::error_code EC = mapWindowsError(::GetLastError());
240 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
243 return std::error_code();
246 std::error_code rename(const Twine &from, const Twine &to) {
247 // Convert to utf-16.
248 SmallVector<wchar_t, 128> wide_from;
249 SmallVector<wchar_t, 128> wide_to;
250 if (std::error_code ec = widenPath(from, wide_from))
252 if (std::error_code ec = widenPath(to, wide_to))
255 std::error_code ec = std::error_code();
257 // Retry while we see ERROR_ACCESS_DENIED.
258 // System scanners (eg. indexer) might open the source file when it is written
261 for (int i = 0; i < 2000; i++) {
262 // Try ReplaceFile first, as it is able to associate a new data stream with
263 // the destination even if the destination file is currently open.
264 if (::ReplaceFileW(wide_to.begin(), wide_from.begin(), NULL, 0, NULL, NULL))
265 return std::error_code();
267 // We get ERROR_FILE_NOT_FOUND if the destination file is missing.
268 // MoveFileEx can handle this case.
269 DWORD ReplaceError = ::GetLastError();
270 ec = mapWindowsError(ReplaceError);
271 if (ReplaceError != ERROR_ACCESS_DENIED &&
272 ReplaceError != ERROR_FILE_NOT_FOUND &&
273 ReplaceError != ERROR_SHARING_VIOLATION)
276 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
277 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
278 return std::error_code();
280 DWORD MoveError = ::GetLastError();
281 ec = mapWindowsError(MoveError);
282 if (MoveError != ERROR_ACCESS_DENIED) break;
290 std::error_code resize_file(int FD, uint64_t Size) {
291 #ifdef HAVE__CHSIZE_S
292 errno_t error = ::_chsize_s(FD, Size);
294 errno_t error = ::_chsize(FD, Size);
296 return std::error_code(error, std::generic_category());
299 std::error_code access(const Twine &Path, AccessMode Mode) {
300 SmallVector<wchar_t, 128> PathUtf16;
302 if (std::error_code EC = widenPath(Path, PathUtf16))
305 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
307 if (Attributes == INVALID_FILE_ATTRIBUTES) {
308 // See if the file didn't actually exist.
309 DWORD LastError = ::GetLastError();
310 if (LastError != ERROR_FILE_NOT_FOUND &&
311 LastError != ERROR_PATH_NOT_FOUND)
312 return mapWindowsError(LastError);
313 return errc::no_such_file_or_directory;
316 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
317 return errc::permission_denied;
319 return std::error_code();
322 bool can_execute(const Twine &Path) {
323 return !access(Path, AccessMode::Execute) ||
324 !access(Path + ".exe", AccessMode::Execute);
327 bool equivalent(file_status A, file_status B) {
328 assert(status_known(A) && status_known(B));
329 return A.FileIndexHigh == B.FileIndexHigh &&
330 A.FileIndexLow == B.FileIndexLow &&
331 A.FileSizeHigh == B.FileSizeHigh &&
332 A.FileSizeLow == B.FileSizeLow &&
333 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
334 A.LastWriteTimeLow == B.LastWriteTimeLow &&
335 A.VolumeSerialNumber == B.VolumeSerialNumber;
338 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
339 file_status fsA, fsB;
340 if (std::error_code ec = status(A, fsA))
342 if (std::error_code ec = status(B, fsB))
344 result = equivalent(fsA, fsB);
345 return std::error_code();
348 static bool isReservedName(StringRef path) {
349 // This list of reserved names comes from MSDN, at:
350 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
351 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
352 "com1", "com2", "com3", "com4", "com5", "com6",
353 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
354 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
356 // First, check to see if this is a device namespace, which always
357 // starts with \\.\, since device namespaces are not legal file paths.
358 if (path.startswith("\\\\.\\"))
361 // Then compare against the list of ancient reserved names
362 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
363 if (path.equals_lower(sReservedNames[i]))
367 // The path isn't what we consider reserved.
371 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
372 if (FileHandle == INVALID_HANDLE_VALUE)
373 goto handle_status_error;
375 switch (::GetFileType(FileHandle)) {
377 llvm_unreachable("Don't know anything about this file type");
378 case FILE_TYPE_UNKNOWN: {
379 DWORD Err = ::GetLastError();
381 return mapWindowsError(Err);
382 Result = file_status(file_type::type_unknown);
383 return std::error_code();
388 Result = file_status(file_type::character_file);
389 return std::error_code();
391 Result = file_status(file_type::fifo_file);
392 return std::error_code();
395 BY_HANDLE_FILE_INFORMATION Info;
396 if (!::GetFileInformationByHandle(FileHandle, &Info))
397 goto handle_status_error;
400 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
401 ? file_type::directory_file
402 : file_type::regular_file;
404 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
405 Info.ftLastWriteTime.dwLowDateTime,
406 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
407 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
408 return std::error_code();
412 DWORD LastError = ::GetLastError();
413 if (LastError == ERROR_FILE_NOT_FOUND ||
414 LastError == ERROR_PATH_NOT_FOUND)
415 Result = file_status(file_type::file_not_found);
416 else if (LastError == ERROR_SHARING_VIOLATION)
417 Result = file_status(file_type::type_unknown);
419 Result = file_status(file_type::status_error);
420 return mapWindowsError(LastError);
423 std::error_code status(const Twine &path, file_status &result) {
424 SmallString<128> path_storage;
425 SmallVector<wchar_t, 128> path_utf16;
427 StringRef path8 = path.toStringRef(path_storage);
428 if (isReservedName(path8)) {
429 result = file_status(file_type::character_file);
430 return std::error_code();
433 if (std::error_code ec = widenPath(path8, path_utf16))
436 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
437 if (attr == INVALID_FILE_ATTRIBUTES)
438 return getStatus(INVALID_HANDLE_VALUE, result);
440 // Handle reparse points.
441 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
443 ::CreateFileW(path_utf16.begin(),
444 0, // Attributes only.
445 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
448 FILE_FLAG_BACKUP_SEMANTICS,
451 return getStatus(INVALID_HANDLE_VALUE, result);
455 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
456 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
457 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
459 return getStatus(INVALID_HANDLE_VALUE, result);
461 return getStatus(h, result);
464 std::error_code status(int FD, file_status &Result) {
465 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
466 return getStatus(FileHandle, Result);
469 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
471 UI.QuadPart = Time.toWin32Time();
473 FT.dwLowDateTime = UI.LowPart;
474 FT.dwHighDateTime = UI.HighPart;
475 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
476 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
477 return mapWindowsError(::GetLastError());
478 return std::error_code();
481 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
483 // Make sure that the requested size fits within SIZE_T.
484 if (Size > std::numeric_limits<SIZE_T>::max())
485 return make_error_code(errc::invalid_argument);
487 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
488 if (FileHandle == INVALID_HANDLE_VALUE)
489 return make_error_code(errc::bad_file_descriptor);
493 case readonly: flprotect = PAGE_READONLY; break;
494 case readwrite: flprotect = PAGE_READWRITE; break;
495 case priv: flprotect = PAGE_WRITECOPY; break;
498 HANDLE FileMappingHandle =
499 ::CreateFileMappingW(FileHandle, 0, flprotect,
500 (Offset + Size) >> 32,
501 (Offset + Size) & 0xffffffff,
503 if (FileMappingHandle == NULL) {
504 std::error_code ec = mapWindowsError(GetLastError());
508 DWORD dwDesiredAccess;
510 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
511 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
512 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
514 Mapping = ::MapViewOfFile(FileMappingHandle,
519 if (Mapping == NULL) {
520 std::error_code ec = mapWindowsError(GetLastError());
521 ::CloseHandle(FileMappingHandle);
526 MEMORY_BASIC_INFORMATION mbi;
527 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
529 std::error_code ec = mapWindowsError(GetLastError());
530 ::UnmapViewOfFile(Mapping);
531 ::CloseHandle(FileMappingHandle);
534 Size = mbi.RegionSize;
537 // Close all the handles except for the view. It will keep the other handles
539 ::CloseHandle(FileMappingHandle);
540 return std::error_code();
543 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
544 uint64_t offset, std::error_code &ec)
545 : Size(length), Mapping() {
546 ec = init(fd, offset, mode);
551 mapped_file_region::~mapped_file_region() {
553 ::UnmapViewOfFile(Mapping);
556 uint64_t mapped_file_region::size() const {
557 assert(Mapping && "Mapping failed but used anyway!");
561 char *mapped_file_region::data() const {
562 assert(Mapping && "Mapping failed but used anyway!");
563 return reinterpret_cast<char*>(Mapping);
566 const char *mapped_file_region::const_data() const {
567 assert(Mapping && "Mapping failed but used anyway!");
568 return reinterpret_cast<const char*>(Mapping);
571 int mapped_file_region::alignment() {
573 ::GetSystemInfo(&SysInfo);
574 return SysInfo.dwAllocationGranularity;
577 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
579 SmallVector<wchar_t, 128> path_utf16;
581 if (std::error_code ec = widenPath(path, path_utf16))
584 // Convert path to the format that Windows is happy with.
585 if (path_utf16.size() > 0 &&
586 !is_separator(path_utf16[path.size() - 1]) &&
587 path_utf16[path.size() - 1] != L':') {
588 path_utf16.push_back(L'\\');
589 path_utf16.push_back(L'*');
591 path_utf16.push_back(L'*');
594 // Get the first directory entry.
595 WIN32_FIND_DATAW FirstFind;
596 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
598 return mapWindowsError(::GetLastError());
600 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
601 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
602 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
603 FirstFind.cFileName[1] == L'.'))
604 if (!::FindNextFileW(FindHandle, &FirstFind)) {
605 DWORD LastError = ::GetLastError();
607 if (LastError == ERROR_NO_MORE_FILES)
608 return detail::directory_iterator_destruct(it);
609 return mapWindowsError(LastError);
611 FilenameLen = ::wcslen(FirstFind.cFileName);
613 // Construct the current directory entry.
614 SmallString<128> directory_entry_name_utf8;
615 if (std::error_code ec =
616 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
617 directory_entry_name_utf8))
620 it.IterationHandle = intptr_t(FindHandle.take());
621 SmallString<128> directory_entry_path(path);
622 path::append(directory_entry_path, directory_entry_name_utf8);
623 it.CurrentEntry = directory_entry(directory_entry_path);
625 return std::error_code();
628 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
629 if (it.IterationHandle != 0)
630 // Closes the handle if it's valid.
631 ScopedFindHandle close(HANDLE(it.IterationHandle));
632 it.IterationHandle = 0;
633 it.CurrentEntry = directory_entry();
634 return std::error_code();
637 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
638 WIN32_FIND_DATAW FindData;
639 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
640 DWORD LastError = ::GetLastError();
642 if (LastError == ERROR_NO_MORE_FILES)
643 return detail::directory_iterator_destruct(it);
644 return mapWindowsError(LastError);
647 size_t FilenameLen = ::wcslen(FindData.cFileName);
648 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
649 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
650 FindData.cFileName[1] == L'.'))
651 return directory_iterator_increment(it);
653 SmallString<128> directory_entry_path_utf8;
654 if (std::error_code ec =
655 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
656 directory_entry_path_utf8))
659 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
660 return std::error_code();
663 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
664 SmallVector<wchar_t, 128> PathUTF16;
666 if (std::error_code EC = widenPath(Name, PathUTF16))
670 ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
671 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
672 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
673 if (H == INVALID_HANDLE_VALUE) {
674 DWORD LastError = ::GetLastError();
675 std::error_code EC = mapWindowsError(LastError);
676 // Provide a better error message when trying to open directories.
677 // This only runs if we failed to open the file, so there is probably
678 // no performances issues.
679 if (LastError != ERROR_ACCESS_DENIED)
681 if (is_directory(Name))
682 return make_error_code(errc::is_a_directory);
686 int FD = ::_open_osfhandle(intptr_t(H), 0);
689 return mapWindowsError(ERROR_INVALID_HANDLE);
693 return std::error_code();
696 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
697 sys::fs::OpenFlags Flags, unsigned Mode) {
698 // Verify that we don't have both "append" and "excl".
699 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
700 "Cannot specify both 'excl' and 'append' file creation flags!");
702 SmallVector<wchar_t, 128> PathUTF16;
704 if (std::error_code EC = widenPath(Name, PathUTF16))
707 DWORD CreationDisposition;
709 CreationDisposition = CREATE_NEW;
710 else if (Flags & F_Append)
711 CreationDisposition = OPEN_ALWAYS;
713 CreationDisposition = CREATE_ALWAYS;
715 DWORD Access = GENERIC_WRITE;
717 Access |= GENERIC_READ;
719 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
720 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
721 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
723 if (H == INVALID_HANDLE_VALUE) {
724 DWORD LastError = ::GetLastError();
725 std::error_code EC = mapWindowsError(LastError);
726 // Provide a better error message when trying to open directories.
727 // This only runs if we failed to open the file, so there is probably
728 // no performances issues.
729 if (LastError != ERROR_ACCESS_DENIED)
731 if (is_directory(Name))
732 return make_error_code(errc::is_a_directory);
737 if (Flags & F_Append)
738 OpenFlags |= _O_APPEND;
741 OpenFlags |= _O_TEXT;
743 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
746 return mapWindowsError(ERROR_INVALID_HANDLE);
750 return std::error_code();
752 } // end namespace fs
756 bool home_directory(SmallVectorImpl<char> &result) {
757 wchar_t Path[MAX_PATH];
758 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
759 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
762 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
768 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
769 SmallVector<wchar_t, 128> NameUTF16;
770 if (windows::UTF8ToUTF16(Var, NameUTF16))
773 SmallVector<wchar_t, 1024> Buf;
778 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
782 // Try again with larger buffer.
783 } while (Size > Buf.capacity());
786 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
791 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
792 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
793 for (const char *Env : EnvironmentVariables) {
794 if (getTempDirEnvVar(Env, Res))
800 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
801 (void)ErasedOnReboot;
804 // Check whether the temporary directory is specified by an environment
806 if (getTempDirEnvVar(Result))
809 // Fall back to a system default.
810 const char *DefaultResult = "C:\\TEMP";
811 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
813 } // end namespace path
816 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
817 llvm::SmallVectorImpl<wchar_t> &utf16) {
819 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
820 utf8.size(), utf16.begin(), 0);
823 return mapWindowsError(::GetLastError());
825 utf16.reserve(len + 1);
828 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
829 utf8.size(), utf16.begin(), utf16.size());
832 return mapWindowsError(::GetLastError());
835 // Make utf16 null terminated.
839 return std::error_code();
843 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
845 llvm::SmallVectorImpl<char> &utf8) {
848 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
852 return mapWindowsError(::GetLastError());
857 // Now do the actual conversion.
858 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
859 utf8.size(), NULL, NULL);
862 return mapWindowsError(::GetLastError());
865 // Make utf8 null terminated.
869 return std::error_code();
872 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
873 llvm::SmallVectorImpl<char> &utf8) {
874 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
877 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
878 llvm::SmallVectorImpl<char> &utf8) {
879 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
881 } // end namespace windows
882 } // end namespace sys
883 } // end namespace llvm