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) {
186 SmallVector<wchar_t, 128> path_utf16;
188 if (std::error_code ec = widenPath(path, path_utf16))
191 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
192 DWORD LastError = ::GetLastError();
193 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
194 return mapWindowsError(LastError);
197 return std::error_code();
200 // We can't use symbolic links for windows.
201 std::error_code create_link(const Twine &to, const Twine &from) {
202 // Convert to utf-16.
203 SmallVector<wchar_t, 128> wide_from;
204 SmallVector<wchar_t, 128> wide_to;
205 if (std::error_code ec = widenPath(from, wide_from))
207 if (std::error_code ec = widenPath(to, wide_to))
210 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
211 return mapWindowsError(::GetLastError());
213 return std::error_code();
216 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
217 SmallVector<wchar_t, 128> path_utf16;
220 if (std::error_code EC = status(path, ST)) {
221 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
223 return std::error_code();
226 if (std::error_code ec = widenPath(path, path_utf16))
229 if (ST.type() == file_type::directory_file) {
230 if (!::RemoveDirectoryW(c_str(path_utf16))) {
231 std::error_code EC = mapWindowsError(::GetLastError());
232 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
235 return std::error_code();
237 if (!::DeleteFileW(c_str(path_utf16))) {
238 std::error_code EC = mapWindowsError(::GetLastError());
239 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
242 return std::error_code();
245 std::error_code rename(const Twine &from, const Twine &to) {
246 // Convert to utf-16.
247 SmallVector<wchar_t, 128> wide_from;
248 SmallVector<wchar_t, 128> wide_to;
249 if (std::error_code ec = widenPath(from, wide_from))
251 if (std::error_code ec = widenPath(to, wide_to))
254 std::error_code ec = std::error_code();
255 for (int i = 0; i < 2000; i++) {
256 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
257 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
258 return std::error_code();
259 DWORD LastError = ::GetLastError();
260 ec = mapWindowsError(LastError);
261 if (LastError != ERROR_ACCESS_DENIED)
263 // Retry MoveFile() at ACCESS_DENIED.
264 // System scanners (eg. indexer) might open the source file when
265 // It is written and closed.
272 std::error_code resize_file(int FD, uint64_t Size) {
273 #ifdef HAVE__CHSIZE_S
274 errno_t error = ::_chsize_s(FD, Size);
276 errno_t error = ::_chsize(FD, Size);
278 return std::error_code(error, std::generic_category());
281 std::error_code access(const Twine &Path, AccessMode Mode) {
282 SmallVector<wchar_t, 128> PathUtf16;
284 if (std::error_code EC = widenPath(Path, PathUtf16))
287 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
289 if (Attributes == INVALID_FILE_ATTRIBUTES) {
290 // See if the file didn't actually exist.
291 DWORD LastError = ::GetLastError();
292 if (LastError != ERROR_FILE_NOT_FOUND &&
293 LastError != ERROR_PATH_NOT_FOUND)
294 return mapWindowsError(LastError);
295 return errc::no_such_file_or_directory;
298 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
299 return errc::permission_denied;
301 return std::error_code();
304 bool equivalent(file_status A, file_status B) {
305 assert(status_known(A) && status_known(B));
306 return A.FileIndexHigh == B.FileIndexHigh &&
307 A.FileIndexLow == B.FileIndexLow &&
308 A.FileSizeHigh == B.FileSizeHigh &&
309 A.FileSizeLow == B.FileSizeLow &&
310 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
311 A.LastWriteTimeLow == B.LastWriteTimeLow &&
312 A.VolumeSerialNumber == B.VolumeSerialNumber;
315 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
316 file_status fsA, fsB;
317 if (std::error_code ec = status(A, fsA))
319 if (std::error_code ec = status(B, fsB))
321 result = equivalent(fsA, fsB);
322 return std::error_code();
325 static bool isReservedName(StringRef path) {
326 // This list of reserved names comes from MSDN, at:
327 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
328 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
329 "com1", "com2", "com3", "com4", "com5", "com6",
330 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
331 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
333 // First, check to see if this is a device namespace, which always
334 // starts with \\.\, since device namespaces are not legal file paths.
335 if (path.startswith("\\\\.\\"))
338 // Then compare against the list of ancient reserved names
339 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
340 if (path.equals_lower(sReservedNames[i]))
344 // The path isn't what we consider reserved.
348 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
349 if (FileHandle == INVALID_HANDLE_VALUE)
350 goto handle_status_error;
352 switch (::GetFileType(FileHandle)) {
354 llvm_unreachable("Don't know anything about this file type");
355 case FILE_TYPE_UNKNOWN: {
356 DWORD Err = ::GetLastError();
358 return mapWindowsError(Err);
359 Result = file_status(file_type::type_unknown);
360 return std::error_code();
365 Result = file_status(file_type::character_file);
366 return std::error_code();
368 Result = file_status(file_type::fifo_file);
369 return std::error_code();
372 BY_HANDLE_FILE_INFORMATION Info;
373 if (!::GetFileInformationByHandle(FileHandle, &Info))
374 goto handle_status_error;
377 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
378 ? file_type::directory_file
379 : file_type::regular_file;
381 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
382 Info.ftLastWriteTime.dwLowDateTime,
383 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
384 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
385 return std::error_code();
389 DWORD LastError = ::GetLastError();
390 if (LastError == ERROR_FILE_NOT_FOUND ||
391 LastError == ERROR_PATH_NOT_FOUND)
392 Result = file_status(file_type::file_not_found);
393 else if (LastError == ERROR_SHARING_VIOLATION)
394 Result = file_status(file_type::type_unknown);
396 Result = file_status(file_type::status_error);
397 return mapWindowsError(LastError);
400 std::error_code status(const Twine &path, file_status &result) {
401 SmallString<128> path_storage;
402 SmallVector<wchar_t, 128> path_utf16;
404 StringRef path8 = path.toStringRef(path_storage);
405 if (isReservedName(path8)) {
406 result = file_status(file_type::character_file);
407 return std::error_code();
410 if (std::error_code ec = widenPath(path8, path_utf16))
413 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
414 if (attr == INVALID_FILE_ATTRIBUTES)
415 return getStatus(INVALID_HANDLE_VALUE, result);
417 // Handle reparse points.
418 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
420 ::CreateFileW(path_utf16.begin(),
421 0, // Attributes only.
422 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
425 FILE_FLAG_BACKUP_SEMANTICS,
428 return getStatus(INVALID_HANDLE_VALUE, result);
432 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
433 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
434 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
436 return getStatus(INVALID_HANDLE_VALUE, result);
438 return getStatus(h, result);
441 std::error_code status(int FD, file_status &Result) {
442 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
443 return getStatus(FileHandle, Result);
446 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
448 UI.QuadPart = Time.toWin32Time();
450 FT.dwLowDateTime = UI.LowPart;
451 FT.dwHighDateTime = UI.HighPart;
452 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
453 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
454 return mapWindowsError(::GetLastError());
455 return std::error_code();
458 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
460 // Make sure that the requested size fits within SIZE_T.
461 if (Size > std::numeric_limits<SIZE_T>::max())
462 return make_error_code(errc::invalid_argument);
464 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
465 if (FileHandle == INVALID_HANDLE_VALUE)
466 return make_error_code(errc::bad_file_descriptor);
470 case readonly: flprotect = PAGE_READONLY; break;
471 case readwrite: flprotect = PAGE_READWRITE; break;
472 case priv: flprotect = PAGE_WRITECOPY; break;
475 HANDLE FileMappingHandle =
476 ::CreateFileMappingW(FileHandle, 0, flprotect,
477 (Offset + Size) >> 32,
478 (Offset + Size) & 0xffffffff,
480 if (FileMappingHandle == NULL) {
481 std::error_code ec = mapWindowsError(GetLastError());
485 DWORD dwDesiredAccess;
487 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
488 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
489 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
491 Mapping = ::MapViewOfFile(FileMappingHandle,
496 if (Mapping == NULL) {
497 std::error_code ec = mapWindowsError(GetLastError());
498 ::CloseHandle(FileMappingHandle);
503 MEMORY_BASIC_INFORMATION mbi;
504 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
506 std::error_code ec = mapWindowsError(GetLastError());
507 ::UnmapViewOfFile(Mapping);
508 ::CloseHandle(FileMappingHandle);
511 Size = mbi.RegionSize;
514 // Close all the handles except for the view. It will keep the other handles
516 ::CloseHandle(FileMappingHandle);
517 return std::error_code();
520 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
521 uint64_t offset, std::error_code &ec)
522 : Size(length), Mapping() {
523 ec = init(fd, offset, mode);
528 mapped_file_region::~mapped_file_region() {
530 ::UnmapViewOfFile(Mapping);
533 uint64_t mapped_file_region::size() const {
534 assert(Mapping && "Mapping failed but used anyway!");
538 char *mapped_file_region::data() const {
539 assert(Mapping && "Mapping failed but used anyway!");
540 return reinterpret_cast<char*>(Mapping);
543 const char *mapped_file_region::const_data() const {
544 assert(Mapping && "Mapping failed but used anyway!");
545 return reinterpret_cast<const char*>(Mapping);
548 int mapped_file_region::alignment() {
550 ::GetSystemInfo(&SysInfo);
551 return SysInfo.dwAllocationGranularity;
554 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
556 SmallVector<wchar_t, 128> path_utf16;
558 if (std::error_code ec = widenPath(path, path_utf16))
561 // Convert path to the format that Windows is happy with.
562 if (path_utf16.size() > 0 &&
563 !is_separator(path_utf16[path.size() - 1]) &&
564 path_utf16[path.size() - 1] != L':') {
565 path_utf16.push_back(L'\\');
566 path_utf16.push_back(L'*');
568 path_utf16.push_back(L'*');
571 // Get the first directory entry.
572 WIN32_FIND_DATAW FirstFind;
573 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
575 return mapWindowsError(::GetLastError());
577 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
578 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
579 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
580 FirstFind.cFileName[1] == L'.'))
581 if (!::FindNextFileW(FindHandle, &FirstFind)) {
582 DWORD LastError = ::GetLastError();
584 if (LastError == ERROR_NO_MORE_FILES)
585 return detail::directory_iterator_destruct(it);
586 return mapWindowsError(LastError);
588 FilenameLen = ::wcslen(FirstFind.cFileName);
590 // Construct the current directory entry.
591 SmallString<128> directory_entry_name_utf8;
592 if (std::error_code ec =
593 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
594 directory_entry_name_utf8))
597 it.IterationHandle = intptr_t(FindHandle.take());
598 SmallString<128> directory_entry_path(path);
599 path::append(directory_entry_path, directory_entry_name_utf8);
600 it.CurrentEntry = directory_entry(directory_entry_path);
602 return std::error_code();
605 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
606 if (it.IterationHandle != 0)
607 // Closes the handle if it's valid.
608 ScopedFindHandle close(HANDLE(it.IterationHandle));
609 it.IterationHandle = 0;
610 it.CurrentEntry = directory_entry();
611 return std::error_code();
614 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
615 WIN32_FIND_DATAW FindData;
616 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
617 DWORD LastError = ::GetLastError();
619 if (LastError == ERROR_NO_MORE_FILES)
620 return detail::directory_iterator_destruct(it);
621 return mapWindowsError(LastError);
624 size_t FilenameLen = ::wcslen(FindData.cFileName);
625 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
626 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
627 FindData.cFileName[1] == L'.'))
628 return directory_iterator_increment(it);
630 SmallString<128> directory_entry_path_utf8;
631 if (std::error_code ec =
632 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
633 directory_entry_path_utf8))
636 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
637 return std::error_code();
640 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
641 SmallVector<wchar_t, 128> PathUTF16;
643 if (std::error_code EC = widenPath(Name, PathUTF16))
646 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
647 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
648 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
649 if (H == INVALID_HANDLE_VALUE) {
650 DWORD LastError = ::GetLastError();
651 std::error_code EC = mapWindowsError(LastError);
652 // Provide a better error message when trying to open directories.
653 // This only runs if we failed to open the file, so there is probably
654 // no performances issues.
655 if (LastError != ERROR_ACCESS_DENIED)
657 if (is_directory(Name))
658 return make_error_code(errc::is_a_directory);
662 int FD = ::_open_osfhandle(intptr_t(H), 0);
665 return mapWindowsError(ERROR_INVALID_HANDLE);
669 return std::error_code();
672 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
673 sys::fs::OpenFlags Flags, unsigned Mode) {
674 // Verify that we don't have both "append" and "excl".
675 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
676 "Cannot specify both 'excl' and 'append' file creation flags!");
678 SmallVector<wchar_t, 128> PathUTF16;
680 if (std::error_code EC = widenPath(Name, PathUTF16))
683 DWORD CreationDisposition;
685 CreationDisposition = CREATE_NEW;
686 else if (Flags & F_Append)
687 CreationDisposition = OPEN_ALWAYS;
689 CreationDisposition = CREATE_ALWAYS;
691 DWORD Access = GENERIC_WRITE;
693 Access |= GENERIC_READ;
695 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
696 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
697 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
699 if (H == INVALID_HANDLE_VALUE) {
700 DWORD LastError = ::GetLastError();
701 std::error_code EC = mapWindowsError(LastError);
702 // Provide a better error message when trying to open directories.
703 // This only runs if we failed to open the file, so there is probably
704 // no performances issues.
705 if (LastError != ERROR_ACCESS_DENIED)
707 if (is_directory(Name))
708 return make_error_code(errc::is_a_directory);
713 if (Flags & F_Append)
714 OpenFlags |= _O_APPEND;
717 OpenFlags |= _O_TEXT;
719 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
722 return mapWindowsError(ERROR_INVALID_HANDLE);
726 return std::error_code();
728 } // end namespace fs
732 bool home_directory(SmallVectorImpl<char> &result) {
733 wchar_t Path[MAX_PATH];
734 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
735 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
738 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
744 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
745 SmallVector<wchar_t, 128> NameUTF16;
746 if (windows::UTF8ToUTF16(Var, NameUTF16))
749 SmallVector<wchar_t, 1024> Buf;
754 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
758 // Try again with larger buffer.
759 } while (Size > Buf.capacity());
762 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
767 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
768 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
769 for (const char *Env : EnvironmentVariables) {
770 if (getTempDirEnvVar(Env, Res))
776 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
777 (void)ErasedOnReboot;
780 // Check whether the temporary directory is specified by an environment
782 if (getTempDirEnvVar(Result))
785 // Fall back to a system default.
786 const char *DefaultResult = "C:\\TEMP";
787 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
789 } // end namespace path
792 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
793 llvm::SmallVectorImpl<wchar_t> &utf16) {
795 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
796 utf8.size(), utf16.begin(), 0);
799 return mapWindowsError(::GetLastError());
801 utf16.reserve(len + 1);
804 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
805 utf8.size(), utf16.begin(), utf16.size());
808 return mapWindowsError(::GetLastError());
811 // Make utf16 null terminated.
815 return std::error_code();
819 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
821 llvm::SmallVectorImpl<char> &utf8) {
824 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
828 return mapWindowsError(::GetLastError());
833 // Now do the actual conversion.
834 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
835 utf8.size(), NULL, NULL);
838 return mapWindowsError(::GetLastError());
841 // Make utf8 null terminated.
845 return std::error_code();
848 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
849 llvm::SmallVectorImpl<char> &utf8) {
850 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
853 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
854 llvm::SmallVectorImpl<char> &utf8) {
855 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
857 } // end namespace windows
858 } // end namespace sys
859 } // end namespace llvm