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 std::error_code windows_error(DWORD E) {
50 return mapWindowsError(E);
53 static bool is_separator(const wchar_t value) {
67 // Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the
68 // path is longer than CreateDirectory can tolerate, make it absolute and
69 // prefixed by '\\?\'.
70 std::error_code widenPath(const Twine &Path8,
71 SmallVectorImpl<wchar_t> &Path16) {
72 const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename.
74 // Several operations would convert Path8 to SmallString; more efficient to
75 // do it once up front.
76 SmallString<128> Path8Str;
77 Path8.toVector(Path8Str);
79 // If we made this path absolute, how much longer would it get?
81 if (llvm::sys::path::is_absolute(Twine(Path8Str)))
82 CurPathLen = 0; // No contribution from current_path needed.
84 CurPathLen = ::GetCurrentDirectoryW(0, NULL);
86 return windows_error(::GetLastError());
89 // Would the absolute path be longer than our limit?
90 if ((Path8Str.size() + CurPathLen) >= MaxDirLen &&
91 !Path8Str.startswith("\\\\?\\")) {
92 SmallString<2*MAX_PATH> FullPath("\\\\?\\");
94 SmallString<80> CurPath;
95 if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
97 FullPath.append(CurPath);
99 // Traverse the requested path, canonicalizing . and .. as we go (because
100 // the \\?\ prefix is documented to treat them as real components).
101 // The iterators don't report separators and append() always attaches
102 // preferred_separator so we don't need to call native() on the result.
103 for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str),
104 E = llvm::sys::path::end(Path8Str);
106 if (I->size() == 1 && *I == ".")
108 if (I->size() == 2 && *I == "..")
109 llvm::sys::path::remove_filename(FullPath);
111 llvm::sys::path::append(FullPath, *I);
113 return UTF8ToUTF16(FullPath, Path16);
116 // Just use the caller's original path.
117 return UTF8ToUTF16(Path8Str, Path16);
119 } // end namespace path
123 std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
124 SmallVector<wchar_t, MAX_PATH> PathName;
125 DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
127 // A zero return value indicates a failure other than insufficient space.
131 // Insufficient space is determined by a return value equal to the size of
132 // the buffer passed in.
133 if (Size == PathName.capacity())
136 // On success, GetModuleFileNameW returns the number of characters written to
137 // the buffer not including the NULL terminator.
138 PathName.set_size(Size);
140 // Convert the result from UTF-16 to UTF-8.
141 SmallVector<char, MAX_PATH> PathNameUTF8;
142 if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
145 return std::string(PathNameUTF8.data());
148 UniqueID file_status::getUniqueID() const {
149 // The file is uniquely identified by the volume serial number along
150 // with the 64-bit file identifier.
151 uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
152 static_cast<uint64_t>(FileIndexLow);
154 return UniqueID(VolumeSerialNumber, FileID);
157 TimeValue file_status::getLastModificationTime() const {
159 UI.LowPart = LastWriteTimeLow;
160 UI.HighPart = LastWriteTimeHigh;
163 Ret.fromWin32Time(UI.QuadPart);
167 std::error_code current_path(SmallVectorImpl<char> &result) {
168 SmallVector<wchar_t, MAX_PATH> cur_path;
169 DWORD len = MAX_PATH;
172 cur_path.reserve(len);
173 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
175 // A zero return value indicates a failure other than insufficient space.
177 return windows_error(::GetLastError());
179 // If there's insufficient space, the len returned is larger than the len
181 } while (len > cur_path.capacity());
183 // On success, GetCurrentDirectoryW returns the number of characters not
184 // including the null-terminator.
185 cur_path.set_size(len);
186 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
189 std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
190 SmallVector<wchar_t, 128> path_utf16;
192 if (std::error_code ec = widenPath(path, path_utf16))
195 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
196 DWORD LastError = ::GetLastError();
197 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
198 return windows_error(LastError);
201 return std::error_code();
204 // We can't use symbolic links for windows.
205 std::error_code create_link(const Twine &to, const Twine &from) {
206 // Convert to utf-16.
207 SmallVector<wchar_t, 128> wide_from;
208 SmallVector<wchar_t, 128> wide_to;
209 if (std::error_code ec = widenPath(from, wide_from))
211 if (std::error_code ec = widenPath(to, wide_to))
214 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
215 return windows_error(::GetLastError());
217 return std::error_code();
220 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
221 SmallVector<wchar_t, 128> path_utf16;
224 if (std::error_code EC = status(path, ST)) {
225 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
227 return std::error_code();
230 if (std::error_code ec = widenPath(path, path_utf16))
233 if (ST.type() == file_type::directory_file) {
234 if (!::RemoveDirectoryW(c_str(path_utf16))) {
235 std::error_code EC = windows_error(::GetLastError());
236 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
239 return std::error_code();
241 if (!::DeleteFileW(c_str(path_utf16))) {
242 std::error_code EC = windows_error(::GetLastError());
243 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
246 return std::error_code();
249 std::error_code rename(const Twine &from, const Twine &to) {
250 // Convert to utf-16.
251 SmallVector<wchar_t, 128> wide_from;
252 SmallVector<wchar_t, 128> wide_to;
253 if (std::error_code ec = widenPath(from, wide_from))
255 if (std::error_code ec = widenPath(to, wide_to))
258 std::error_code ec = std::error_code();
259 for (int i = 0; i < 2000; i++) {
260 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
261 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
262 return std::error_code();
263 DWORD LastError = ::GetLastError();
264 if (LastError != ERROR_ACCESS_DENIED)
266 // Retry MoveFile() at ACCESS_DENIED.
267 // System scanners (eg. indexer) might open the source file when
268 // It is written and closed.
275 std::error_code resize_file(int FD, uint64_t Size) {
276 #ifdef HAVE__CHSIZE_S
277 errno_t error = ::_chsize_s(FD, Size);
279 errno_t error = ::_chsize(FD, Size);
281 return std::error_code(error, std::generic_category());
284 std::error_code access(const Twine &Path, AccessMode Mode) {
285 SmallVector<wchar_t, 128> PathUtf16;
287 if (std::error_code EC = widenPath(Path, PathUtf16))
290 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
292 if (Attributes == INVALID_FILE_ATTRIBUTES) {
293 // See if the file didn't actually exist.
294 DWORD LastError = ::GetLastError();
295 if (LastError != ERROR_FILE_NOT_FOUND &&
296 LastError != ERROR_PATH_NOT_FOUND)
297 return windows_error(LastError);
298 return errc::no_such_file_or_directory;
301 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
302 return errc::permission_denied;
304 return std::error_code();
307 bool equivalent(file_status A, file_status B) {
308 assert(status_known(A) && status_known(B));
309 return A.FileIndexHigh == B.FileIndexHigh &&
310 A.FileIndexLow == B.FileIndexLow &&
311 A.FileSizeHigh == B.FileSizeHigh &&
312 A.FileSizeLow == B.FileSizeLow &&
313 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
314 A.LastWriteTimeLow == B.LastWriteTimeLow &&
315 A.VolumeSerialNumber == B.VolumeSerialNumber;
318 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
319 file_status fsA, fsB;
320 if (std::error_code ec = status(A, fsA))
322 if (std::error_code ec = status(B, fsB))
324 result = equivalent(fsA, fsB);
325 return std::error_code();
328 static bool isReservedName(StringRef path) {
329 // This list of reserved names comes from MSDN, at:
330 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
331 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
332 "com1", "com2", "com3", "com4", "com5", "com6",
333 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
334 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
336 // First, check to see if this is a device namespace, which always
337 // starts with \\.\, since device namespaces are not legal file paths.
338 if (path.startswith("\\\\.\\"))
341 // Then compare against the list of ancient reserved names
342 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
343 if (path.equals_lower(sReservedNames[i]))
347 // The path isn't what we consider reserved.
351 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
352 if (FileHandle == INVALID_HANDLE_VALUE)
353 goto handle_status_error;
355 switch (::GetFileType(FileHandle)) {
357 llvm_unreachable("Don't know anything about this file type");
358 case FILE_TYPE_UNKNOWN: {
359 DWORD Err = ::GetLastError();
361 return windows_error(Err);
362 Result = file_status(file_type::type_unknown);
363 return std::error_code();
368 Result = file_status(file_type::character_file);
369 return std::error_code();
371 Result = file_status(file_type::fifo_file);
372 return std::error_code();
375 BY_HANDLE_FILE_INFORMATION Info;
376 if (!::GetFileInformationByHandle(FileHandle, &Info))
377 goto handle_status_error;
380 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
381 ? file_type::directory_file
382 : file_type::regular_file;
384 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
385 Info.ftLastWriteTime.dwLowDateTime,
386 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
387 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
388 return std::error_code();
392 DWORD LastError = ::GetLastError();
393 if (LastError == ERROR_FILE_NOT_FOUND ||
394 LastError == ERROR_PATH_NOT_FOUND)
395 Result = file_status(file_type::file_not_found);
396 else if (LastError == ERROR_SHARING_VIOLATION)
397 Result = file_status(file_type::type_unknown);
399 Result = file_status(file_type::status_error);
400 return windows_error(LastError);
403 std::error_code status(const Twine &path, file_status &result) {
404 SmallString<128> path_storage;
405 SmallVector<wchar_t, 128> path_utf16;
407 StringRef path8 = path.toStringRef(path_storage);
408 if (isReservedName(path8)) {
409 result = file_status(file_type::character_file);
410 return std::error_code();
413 if (std::error_code ec = widenPath(path8, path_utf16))
416 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
417 if (attr == INVALID_FILE_ATTRIBUTES)
418 return getStatus(INVALID_HANDLE_VALUE, result);
420 // Handle reparse points.
421 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
423 ::CreateFileW(path_utf16.begin(),
424 0, // Attributes only.
425 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
428 FILE_FLAG_BACKUP_SEMANTICS,
431 return getStatus(INVALID_HANDLE_VALUE, result);
435 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
436 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
437 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
439 return getStatus(INVALID_HANDLE_VALUE, result);
441 return getStatus(h, result);
444 std::error_code status(int FD, file_status &Result) {
445 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
446 return getStatus(FileHandle, Result);
449 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
451 UI.QuadPart = Time.toWin32Time();
453 FT.dwLowDateTime = UI.LowPart;
454 FT.dwHighDateTime = UI.HighPart;
455 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
456 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
457 return windows_error(::GetLastError());
458 return std::error_code();
461 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
464 // Make sure that the requested size fits within SIZE_T.
465 if (Size > std::numeric_limits<SIZE_T>::max()) {
466 if (FileDescriptor) {
468 ::CloseHandle(FileHandle);
469 return make_error_code(errc::invalid_argument);
474 case readonly: flprotect = PAGE_READONLY; break;
475 case readwrite: flprotect = PAGE_READWRITE; break;
476 case priv: flprotect = PAGE_WRITECOPY; break;
480 ::CreateFileMappingW(FileHandle, 0, flprotect,
481 (Offset + Size) >> 32,
482 (Offset + Size) & 0xffffffff,
484 if (FileMappingHandle == NULL) {
485 std::error_code ec = windows_error(GetLastError());
486 if (FileDescriptor) {
488 ::CloseHandle(FileHandle);
492 DWORD dwDesiredAccess;
494 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
495 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
496 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
498 Mapping = ::MapViewOfFile(FileMappingHandle,
503 if (Mapping == NULL) {
504 std::error_code ec = windows_error(GetLastError());
505 ::CloseHandle(FileMappingHandle);
506 if (FileDescriptor) {
508 ::CloseHandle(FileHandle);
513 MEMORY_BASIC_INFORMATION mbi;
514 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
516 std::error_code ec = windows_error(GetLastError());
517 ::UnmapViewOfFile(Mapping);
518 ::CloseHandle(FileMappingHandle);
519 if (FileDescriptor) {
521 ::CloseHandle(FileHandle);
524 Size = mbi.RegionSize;
527 // Close all the handles except for the view. It will keep the other handles
529 ::CloseHandle(FileMappingHandle);
530 if (FileDescriptor) {
532 ::CloseHandle(FileHandle);
533 return std::error_code();
536 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
537 uint64_t offset, std::error_code &ec)
538 : Size(length), Mapping(), FileDescriptor(fd),
539 FileHandle(INVALID_HANDLE_VALUE), FileMappingHandle() {
540 FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
541 if (FileHandle == INVALID_HANDLE_VALUE) {
543 ec = make_error_code(errc::bad_file_descriptor);
547 ec = init(FileDescriptor, offset, mode);
549 Mapping = FileMappingHandle = 0;
550 FileHandle = INVALID_HANDLE_VALUE;
555 mapped_file_region::~mapped_file_region() {
557 ::UnmapViewOfFile(Mapping);
560 uint64_t mapped_file_region::size() const {
561 assert(Mapping && "Mapping failed but used anyway!");
565 char *mapped_file_region::data() const {
566 assert(Mapping && "Mapping failed but used anyway!");
567 return reinterpret_cast<char*>(Mapping);
570 const char *mapped_file_region::const_data() const {
571 assert(Mapping && "Mapping failed but used anyway!");
572 return reinterpret_cast<const char*>(Mapping);
575 int mapped_file_region::alignment() {
577 ::GetSystemInfo(&SysInfo);
578 return SysInfo.dwAllocationGranularity;
581 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
583 SmallVector<wchar_t, 128> path_utf16;
585 if (std::error_code ec = widenPath(path, path_utf16))
588 // Convert path to the format that Windows is happy with.
589 if (path_utf16.size() > 0 &&
590 !is_separator(path_utf16[path.size() - 1]) &&
591 path_utf16[path.size() - 1] != L':') {
592 path_utf16.push_back(L'\\');
593 path_utf16.push_back(L'*');
595 path_utf16.push_back(L'*');
598 // Get the first directory entry.
599 WIN32_FIND_DATAW FirstFind;
600 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
602 return windows_error(::GetLastError());
604 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
605 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
606 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
607 FirstFind.cFileName[1] == L'.'))
608 if (!::FindNextFileW(FindHandle, &FirstFind)) {
609 DWORD LastError = ::GetLastError();
611 if (LastError == ERROR_NO_MORE_FILES)
612 return detail::directory_iterator_destruct(it);
613 return windows_error(LastError);
615 FilenameLen = ::wcslen(FirstFind.cFileName);
617 // Construct the current directory entry.
618 SmallString<128> directory_entry_name_utf8;
619 if (std::error_code ec =
620 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
621 directory_entry_name_utf8))
624 it.IterationHandle = intptr_t(FindHandle.take());
625 SmallString<128> directory_entry_path(path);
626 path::append(directory_entry_path, directory_entry_name_utf8.str());
627 it.CurrentEntry = directory_entry(directory_entry_path.str());
629 return std::error_code();
632 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
633 if (it.IterationHandle != 0)
634 // Closes the handle if it's valid.
635 ScopedFindHandle close(HANDLE(it.IterationHandle));
636 it.IterationHandle = 0;
637 it.CurrentEntry = directory_entry();
638 return std::error_code();
641 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
642 WIN32_FIND_DATAW FindData;
643 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
644 DWORD LastError = ::GetLastError();
646 if (LastError == ERROR_NO_MORE_FILES)
647 return detail::directory_iterator_destruct(it);
648 return windows_error(LastError);
651 size_t FilenameLen = ::wcslen(FindData.cFileName);
652 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
653 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
654 FindData.cFileName[1] == L'.'))
655 return directory_iterator_increment(it);
657 SmallString<128> directory_entry_path_utf8;
658 if (std::error_code ec =
659 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
660 directory_entry_path_utf8))
663 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
664 return std::error_code();
667 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
668 SmallVector<wchar_t, 128> PathUTF16;
670 if (std::error_code EC = widenPath(Name, PathUTF16))
673 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
674 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
675 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
676 if (H == INVALID_HANDLE_VALUE) {
677 DWORD LastError = ::GetLastError();
678 std::error_code EC = windows_error(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 windows_error(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 = windows_error(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 windows_error(ERROR_INVALID_HANDLE);
753 return std::error_code();
755 } // end namespace fs
759 bool home_directory(SmallVectorImpl<char> &result) {
760 wchar_t Path[MAX_PATH];
761 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
762 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
765 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
771 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
772 SmallVector<wchar_t, 128> NameUTF16;
773 if (windows::UTF8ToUTF16(Var, NameUTF16))
776 SmallVector<wchar_t, 1024> Buf;
781 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
785 // Try again with larger buffer.
786 } while (Size > Buf.capacity());
789 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
794 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
795 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
796 for (const char *Env : EnvironmentVariables) {
797 if (getTempDirEnvVar(Env, Res))
803 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
804 (void)ErasedOnReboot;
807 // Check whether the temporary directory is specified by an environment
809 if (getTempDirEnvVar(Result))
812 // Fall back to a system default.
813 const char *DefaultResult = "C:\\TEMP";
814 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
816 } // end namespace path
819 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
820 llvm::SmallVectorImpl<wchar_t> &utf16) {
822 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
823 utf8.size(), utf16.begin(), 0);
826 return windows_error(::GetLastError());
828 utf16.reserve(len + 1);
831 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
832 utf8.size(), utf16.begin(), utf16.size());
835 return windows_error(::GetLastError());
838 // Make utf16 null terminated.
842 return std::error_code();
846 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
848 llvm::SmallVectorImpl<char> &utf8) {
851 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
855 return windows_error(::GetLastError());
860 // Now do the actual conversion.
861 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
862 utf8.size(), NULL, NULL);
865 return windows_error(::GetLastError());
868 // Make utf8 null terminated.
872 return std::error_code();
875 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
876 llvm::SmallVectorImpl<char> &utf8) {
877 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
880 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
881 llvm::SmallVectorImpl<char> &utf8) {
882 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
884 } // end namespace windows
885 } // end namespace sys
886 } // end namespace llvm