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();
256 for (int i = 0; i < 2000; i++) {
257 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
258 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
259 return std::error_code();
260 DWORD LastError = ::GetLastError();
261 ec = mapWindowsError(LastError);
262 if (LastError != ERROR_ACCESS_DENIED)
264 // Retry MoveFile() at ACCESS_DENIED.
265 // System scanners (eg. indexer) might open the source file when
266 // It is written and closed.
273 std::error_code resize_file(int FD, uint64_t Size) {
274 #ifdef HAVE__CHSIZE_S
275 errno_t error = ::_chsize_s(FD, Size);
277 errno_t error = ::_chsize(FD, Size);
279 return std::error_code(error, std::generic_category());
282 std::error_code access(const Twine &Path, AccessMode Mode) {
283 SmallVector<wchar_t, 128> PathUtf16;
285 if (std::error_code EC = widenPath(Path, PathUtf16))
288 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
290 if (Attributes == INVALID_FILE_ATTRIBUTES) {
291 // See if the file didn't actually exist.
292 DWORD LastError = ::GetLastError();
293 if (LastError != ERROR_FILE_NOT_FOUND &&
294 LastError != ERROR_PATH_NOT_FOUND)
295 return mapWindowsError(LastError);
296 return errc::no_such_file_or_directory;
299 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
300 return errc::permission_denied;
302 return std::error_code();
305 bool can_execute(const Twine &Path) {
306 return !access(Path, AccessMode::Execute) ||
307 !access(Path + ".exe", AccessMode::Execute);
310 bool equivalent(file_status A, file_status B) {
311 assert(status_known(A) && status_known(B));
312 return A.FileIndexHigh == B.FileIndexHigh &&
313 A.FileIndexLow == B.FileIndexLow &&
314 A.FileSizeHigh == B.FileSizeHigh &&
315 A.FileSizeLow == B.FileSizeLow &&
316 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
317 A.LastWriteTimeLow == B.LastWriteTimeLow &&
318 A.VolumeSerialNumber == B.VolumeSerialNumber;
321 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
322 file_status fsA, fsB;
323 if (std::error_code ec = status(A, fsA))
325 if (std::error_code ec = status(B, fsB))
327 result = equivalent(fsA, fsB);
328 return std::error_code();
331 static bool isReservedName(StringRef path) {
332 // This list of reserved names comes from MSDN, at:
333 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
334 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
335 "com1", "com2", "com3", "com4", "com5", "com6",
336 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
337 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
339 // First, check to see if this is a device namespace, which always
340 // starts with \\.\, since device namespaces are not legal file paths.
341 if (path.startswith("\\\\.\\"))
344 // Then compare against the list of ancient reserved names
345 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
346 if (path.equals_lower(sReservedNames[i]))
350 // The path isn't what we consider reserved.
354 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
355 if (FileHandle == INVALID_HANDLE_VALUE)
356 goto handle_status_error;
358 switch (::GetFileType(FileHandle)) {
360 llvm_unreachable("Don't know anything about this file type");
361 case FILE_TYPE_UNKNOWN: {
362 DWORD Err = ::GetLastError();
364 return mapWindowsError(Err);
365 Result = file_status(file_type::type_unknown);
366 return std::error_code();
371 Result = file_status(file_type::character_file);
372 return std::error_code();
374 Result = file_status(file_type::fifo_file);
375 return std::error_code();
378 BY_HANDLE_FILE_INFORMATION Info;
379 if (!::GetFileInformationByHandle(FileHandle, &Info))
380 goto handle_status_error;
383 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
384 ? file_type::directory_file
385 : file_type::regular_file;
387 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
388 Info.ftLastWriteTime.dwLowDateTime,
389 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
390 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
391 return std::error_code();
395 DWORD LastError = ::GetLastError();
396 if (LastError == ERROR_FILE_NOT_FOUND ||
397 LastError == ERROR_PATH_NOT_FOUND)
398 Result = file_status(file_type::file_not_found);
399 else if (LastError == ERROR_SHARING_VIOLATION)
400 Result = file_status(file_type::type_unknown);
402 Result = file_status(file_type::status_error);
403 return mapWindowsError(LastError);
406 std::error_code status(const Twine &path, file_status &result) {
407 SmallString<128> path_storage;
408 SmallVector<wchar_t, 128> path_utf16;
410 StringRef path8 = path.toStringRef(path_storage);
411 if (isReservedName(path8)) {
412 result = file_status(file_type::character_file);
413 return std::error_code();
416 if (std::error_code ec = widenPath(path8, path_utf16))
419 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
420 if (attr == INVALID_FILE_ATTRIBUTES)
421 return getStatus(INVALID_HANDLE_VALUE, result);
423 // Handle reparse points.
424 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
426 ::CreateFileW(path_utf16.begin(),
427 0, // Attributes only.
428 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
431 FILE_FLAG_BACKUP_SEMANTICS,
434 return getStatus(INVALID_HANDLE_VALUE, result);
438 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
439 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
440 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
442 return getStatus(INVALID_HANDLE_VALUE, result);
444 return getStatus(h, result);
447 std::error_code status(int FD, file_status &Result) {
448 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
449 return getStatus(FileHandle, Result);
452 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
454 UI.QuadPart = Time.toWin32Time();
456 FT.dwLowDateTime = UI.LowPart;
457 FT.dwHighDateTime = UI.HighPart;
458 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
459 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
460 return mapWindowsError(::GetLastError());
461 return std::error_code();
464 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
466 // Make sure that the requested size fits within SIZE_T.
467 if (Size > std::numeric_limits<SIZE_T>::max())
468 return make_error_code(errc::invalid_argument);
470 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
471 if (FileHandle == INVALID_HANDLE_VALUE)
472 return make_error_code(errc::bad_file_descriptor);
476 case readonly: flprotect = PAGE_READONLY; break;
477 case readwrite: flprotect = PAGE_READWRITE; break;
478 case priv: flprotect = PAGE_WRITECOPY; break;
481 HANDLE FileMappingHandle =
482 ::CreateFileMappingW(FileHandle, 0, flprotect,
483 (Offset + Size) >> 32,
484 (Offset + Size) & 0xffffffff,
486 if (FileMappingHandle == NULL) {
487 std::error_code ec = mapWindowsError(GetLastError());
491 DWORD dwDesiredAccess;
493 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
494 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
495 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
497 Mapping = ::MapViewOfFile(FileMappingHandle,
502 if (Mapping == NULL) {
503 std::error_code ec = mapWindowsError(GetLastError());
504 ::CloseHandle(FileMappingHandle);
509 MEMORY_BASIC_INFORMATION mbi;
510 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
512 std::error_code ec = mapWindowsError(GetLastError());
513 ::UnmapViewOfFile(Mapping);
514 ::CloseHandle(FileMappingHandle);
517 Size = mbi.RegionSize;
520 // Close all the handles except for the view. It will keep the other handles
522 ::CloseHandle(FileMappingHandle);
523 return std::error_code();
526 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
527 uint64_t offset, std::error_code &ec)
528 : Size(length), Mapping() {
529 ec = init(fd, offset, mode);
534 mapped_file_region::~mapped_file_region() {
536 ::UnmapViewOfFile(Mapping);
539 uint64_t mapped_file_region::size() const {
540 assert(Mapping && "Mapping failed but used anyway!");
544 char *mapped_file_region::data() const {
545 assert(Mapping && "Mapping failed but used anyway!");
546 return reinterpret_cast<char*>(Mapping);
549 const char *mapped_file_region::const_data() const {
550 assert(Mapping && "Mapping failed but used anyway!");
551 return reinterpret_cast<const char*>(Mapping);
554 int mapped_file_region::alignment() {
556 ::GetSystemInfo(&SysInfo);
557 return SysInfo.dwAllocationGranularity;
560 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
562 SmallVector<wchar_t, 128> path_utf16;
564 if (std::error_code ec = widenPath(path, path_utf16))
567 // Convert path to the format that Windows is happy with.
568 if (path_utf16.size() > 0 &&
569 !is_separator(path_utf16[path.size() - 1]) &&
570 path_utf16[path.size() - 1] != L':') {
571 path_utf16.push_back(L'\\');
572 path_utf16.push_back(L'*');
574 path_utf16.push_back(L'*');
577 // Get the first directory entry.
578 WIN32_FIND_DATAW FirstFind;
579 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
581 return mapWindowsError(::GetLastError());
583 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
584 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
585 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
586 FirstFind.cFileName[1] == L'.'))
587 if (!::FindNextFileW(FindHandle, &FirstFind)) {
588 DWORD LastError = ::GetLastError();
590 if (LastError == ERROR_NO_MORE_FILES)
591 return detail::directory_iterator_destruct(it);
592 return mapWindowsError(LastError);
594 FilenameLen = ::wcslen(FirstFind.cFileName);
596 // Construct the current directory entry.
597 SmallString<128> directory_entry_name_utf8;
598 if (std::error_code ec =
599 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
600 directory_entry_name_utf8))
603 it.IterationHandle = intptr_t(FindHandle.take());
604 SmallString<128> directory_entry_path(path);
605 path::append(directory_entry_path, directory_entry_name_utf8);
606 it.CurrentEntry = directory_entry(directory_entry_path);
608 return std::error_code();
611 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
612 if (it.IterationHandle != 0)
613 // Closes the handle if it's valid.
614 ScopedFindHandle close(HANDLE(it.IterationHandle));
615 it.IterationHandle = 0;
616 it.CurrentEntry = directory_entry();
617 return std::error_code();
620 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
621 WIN32_FIND_DATAW FindData;
622 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
623 DWORD LastError = ::GetLastError();
625 if (LastError == ERROR_NO_MORE_FILES)
626 return detail::directory_iterator_destruct(it);
627 return mapWindowsError(LastError);
630 size_t FilenameLen = ::wcslen(FindData.cFileName);
631 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
632 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
633 FindData.cFileName[1] == L'.'))
634 return directory_iterator_increment(it);
636 SmallString<128> directory_entry_path_utf8;
637 if (std::error_code ec =
638 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
639 directory_entry_path_utf8))
642 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
643 return std::error_code();
646 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
647 SmallVector<wchar_t, 128> PathUTF16;
649 if (std::error_code EC = widenPath(Name, PathUTF16))
652 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
653 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
654 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
655 if (H == INVALID_HANDLE_VALUE) {
656 DWORD LastError = ::GetLastError();
657 std::error_code EC = mapWindowsError(LastError);
658 // Provide a better error message when trying to open directories.
659 // This only runs if we failed to open the file, so there is probably
660 // no performances issues.
661 if (LastError != ERROR_ACCESS_DENIED)
663 if (is_directory(Name))
664 return make_error_code(errc::is_a_directory);
668 int FD = ::_open_osfhandle(intptr_t(H), 0);
671 return mapWindowsError(ERROR_INVALID_HANDLE);
675 return std::error_code();
678 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
679 sys::fs::OpenFlags Flags, unsigned Mode) {
680 // Verify that we don't have both "append" and "excl".
681 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
682 "Cannot specify both 'excl' and 'append' file creation flags!");
684 SmallVector<wchar_t, 128> PathUTF16;
686 if (std::error_code EC = widenPath(Name, PathUTF16))
689 DWORD CreationDisposition;
691 CreationDisposition = CREATE_NEW;
692 else if (Flags & F_Append)
693 CreationDisposition = OPEN_ALWAYS;
695 CreationDisposition = CREATE_ALWAYS;
697 DWORD Access = GENERIC_WRITE;
699 Access |= GENERIC_READ;
701 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
702 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
703 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
705 if (H == INVALID_HANDLE_VALUE) {
706 DWORD LastError = ::GetLastError();
707 std::error_code EC = mapWindowsError(LastError);
708 // Provide a better error message when trying to open directories.
709 // This only runs if we failed to open the file, so there is probably
710 // no performances issues.
711 if (LastError != ERROR_ACCESS_DENIED)
713 if (is_directory(Name))
714 return make_error_code(errc::is_a_directory);
719 if (Flags & F_Append)
720 OpenFlags |= _O_APPEND;
723 OpenFlags |= _O_TEXT;
725 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
728 return mapWindowsError(ERROR_INVALID_HANDLE);
732 return std::error_code();
734 } // end namespace fs
738 bool home_directory(SmallVectorImpl<char> &result) {
739 wchar_t Path[MAX_PATH];
740 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
741 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
744 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
750 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
751 SmallVector<wchar_t, 128> NameUTF16;
752 if (windows::UTF8ToUTF16(Var, NameUTF16))
755 SmallVector<wchar_t, 1024> Buf;
760 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
764 // Try again with larger buffer.
765 } while (Size > Buf.capacity());
768 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
773 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
774 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
775 for (const char *Env : EnvironmentVariables) {
776 if (getTempDirEnvVar(Env, Res))
782 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
783 (void)ErasedOnReboot;
786 // Check whether the temporary directory is specified by an environment
788 if (getTempDirEnvVar(Result))
791 // Fall back to a system default.
792 const char *DefaultResult = "C:\\TEMP";
793 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
795 } // end namespace path
798 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
799 llvm::SmallVectorImpl<wchar_t> &utf16) {
801 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
802 utf8.size(), utf16.begin(), 0);
805 return mapWindowsError(::GetLastError());
807 utf16.reserve(len + 1);
810 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
811 utf8.size(), utf16.begin(), utf16.size());
814 return mapWindowsError(::GetLastError());
817 // Make utf16 null terminated.
821 return std::error_code();
825 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
827 llvm::SmallVectorImpl<char> &utf8) {
830 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
834 return mapWindowsError(::GetLastError());
839 // Now do the actual conversion.
840 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
841 utf8.size(), NULL, NULL);
844 return mapWindowsError(::GetLastError());
847 // Make utf8 null terminated.
851 return std::error_code();
854 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
855 llvm::SmallVectorImpl<char> &utf8) {
856 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
859 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
860 llvm::SmallVectorImpl<char> &utf8) {
861 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
863 } // end namespace windows
864 } // end namespace sys
865 } // end namespace llvm