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 equivalent(file_status A, file_status B) {
306 assert(status_known(A) && status_known(B));
307 return A.FileIndexHigh == B.FileIndexHigh &&
308 A.FileIndexLow == B.FileIndexLow &&
309 A.FileSizeHigh == B.FileSizeHigh &&
310 A.FileSizeLow == B.FileSizeLow &&
311 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
312 A.LastWriteTimeLow == B.LastWriteTimeLow &&
313 A.VolumeSerialNumber == B.VolumeSerialNumber;
316 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
317 file_status fsA, fsB;
318 if (std::error_code ec = status(A, fsA))
320 if (std::error_code ec = status(B, fsB))
322 result = equivalent(fsA, fsB);
323 return std::error_code();
326 static bool isReservedName(StringRef path) {
327 // This list of reserved names comes from MSDN, at:
328 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
329 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
330 "com1", "com2", "com3", "com4", "com5", "com6",
331 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
332 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
334 // First, check to see if this is a device namespace, which always
335 // starts with \\.\, since device namespaces are not legal file paths.
336 if (path.startswith("\\\\.\\"))
339 // Then compare against the list of ancient reserved names
340 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
341 if (path.equals_lower(sReservedNames[i]))
345 // The path isn't what we consider reserved.
349 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
350 if (FileHandle == INVALID_HANDLE_VALUE)
351 goto handle_status_error;
353 switch (::GetFileType(FileHandle)) {
355 llvm_unreachable("Don't know anything about this file type");
356 case FILE_TYPE_UNKNOWN: {
357 DWORD Err = ::GetLastError();
359 return mapWindowsError(Err);
360 Result = file_status(file_type::type_unknown);
361 return std::error_code();
366 Result = file_status(file_type::character_file);
367 return std::error_code();
369 Result = file_status(file_type::fifo_file);
370 return std::error_code();
373 BY_HANDLE_FILE_INFORMATION Info;
374 if (!::GetFileInformationByHandle(FileHandle, &Info))
375 goto handle_status_error;
378 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
379 ? file_type::directory_file
380 : file_type::regular_file;
382 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
383 Info.ftLastWriteTime.dwLowDateTime,
384 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
385 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
386 return std::error_code();
390 DWORD LastError = ::GetLastError();
391 if (LastError == ERROR_FILE_NOT_FOUND ||
392 LastError == ERROR_PATH_NOT_FOUND)
393 Result = file_status(file_type::file_not_found);
394 else if (LastError == ERROR_SHARING_VIOLATION)
395 Result = file_status(file_type::type_unknown);
397 Result = file_status(file_type::status_error);
398 return mapWindowsError(LastError);
401 std::error_code status(const Twine &path, file_status &result) {
402 SmallString<128> path_storage;
403 SmallVector<wchar_t, 128> path_utf16;
405 StringRef path8 = path.toStringRef(path_storage);
406 if (isReservedName(path8)) {
407 result = file_status(file_type::character_file);
408 return std::error_code();
411 if (std::error_code ec = widenPath(path8, path_utf16))
414 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
415 if (attr == INVALID_FILE_ATTRIBUTES)
416 return getStatus(INVALID_HANDLE_VALUE, result);
418 // Handle reparse points.
419 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
421 ::CreateFileW(path_utf16.begin(),
422 0, // Attributes only.
423 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
426 FILE_FLAG_BACKUP_SEMANTICS,
429 return getStatus(INVALID_HANDLE_VALUE, result);
433 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
434 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
435 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
437 return getStatus(INVALID_HANDLE_VALUE, result);
439 return getStatus(h, result);
442 std::error_code status(int FD, file_status &Result) {
443 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
444 return getStatus(FileHandle, Result);
447 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
449 UI.QuadPart = Time.toWin32Time();
451 FT.dwLowDateTime = UI.LowPart;
452 FT.dwHighDateTime = UI.HighPart;
453 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
454 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
455 return mapWindowsError(::GetLastError());
456 return std::error_code();
459 std::error_code mapped_file_region::init(int FD, uint64_t Offset,
461 // Make sure that the requested size fits within SIZE_T.
462 if (Size > std::numeric_limits<SIZE_T>::max())
463 return make_error_code(errc::invalid_argument);
465 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
466 if (FileHandle == INVALID_HANDLE_VALUE)
467 return make_error_code(errc::bad_file_descriptor);
471 case readonly: flprotect = PAGE_READONLY; break;
472 case readwrite: flprotect = PAGE_READWRITE; break;
473 case priv: flprotect = PAGE_WRITECOPY; break;
476 HANDLE FileMappingHandle =
477 ::CreateFileMappingW(FileHandle, 0, flprotect,
478 (Offset + Size) >> 32,
479 (Offset + Size) & 0xffffffff,
481 if (FileMappingHandle == NULL) {
482 std::error_code ec = mapWindowsError(GetLastError());
486 DWORD dwDesiredAccess;
488 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
489 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
490 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
492 Mapping = ::MapViewOfFile(FileMappingHandle,
497 if (Mapping == NULL) {
498 std::error_code ec = mapWindowsError(GetLastError());
499 ::CloseHandle(FileMappingHandle);
504 MEMORY_BASIC_INFORMATION mbi;
505 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
507 std::error_code ec = mapWindowsError(GetLastError());
508 ::UnmapViewOfFile(Mapping);
509 ::CloseHandle(FileMappingHandle);
512 Size = mbi.RegionSize;
515 // Close all the handles except for the view. It will keep the other handles
517 ::CloseHandle(FileMappingHandle);
518 return std::error_code();
521 mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
522 uint64_t offset, std::error_code &ec)
523 : Size(length), Mapping() {
524 ec = init(fd, offset, mode);
529 mapped_file_region::~mapped_file_region() {
531 ::UnmapViewOfFile(Mapping);
534 uint64_t mapped_file_region::size() const {
535 assert(Mapping && "Mapping failed but used anyway!");
539 char *mapped_file_region::data() const {
540 assert(Mapping && "Mapping failed but used anyway!");
541 return reinterpret_cast<char*>(Mapping);
544 const char *mapped_file_region::const_data() const {
545 assert(Mapping && "Mapping failed but used anyway!");
546 return reinterpret_cast<const char*>(Mapping);
549 int mapped_file_region::alignment() {
551 ::GetSystemInfo(&SysInfo);
552 return SysInfo.dwAllocationGranularity;
555 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
557 SmallVector<wchar_t, 128> path_utf16;
559 if (std::error_code ec = widenPath(path, path_utf16))
562 // Convert path to the format that Windows is happy with.
563 if (path_utf16.size() > 0 &&
564 !is_separator(path_utf16[path.size() - 1]) &&
565 path_utf16[path.size() - 1] != L':') {
566 path_utf16.push_back(L'\\');
567 path_utf16.push_back(L'*');
569 path_utf16.push_back(L'*');
572 // Get the first directory entry.
573 WIN32_FIND_DATAW FirstFind;
574 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
576 return mapWindowsError(::GetLastError());
578 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
579 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
580 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
581 FirstFind.cFileName[1] == L'.'))
582 if (!::FindNextFileW(FindHandle, &FirstFind)) {
583 DWORD LastError = ::GetLastError();
585 if (LastError == ERROR_NO_MORE_FILES)
586 return detail::directory_iterator_destruct(it);
587 return mapWindowsError(LastError);
589 FilenameLen = ::wcslen(FirstFind.cFileName);
591 // Construct the current directory entry.
592 SmallString<128> directory_entry_name_utf8;
593 if (std::error_code ec =
594 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
595 directory_entry_name_utf8))
598 it.IterationHandle = intptr_t(FindHandle.take());
599 SmallString<128> directory_entry_path(path);
600 path::append(directory_entry_path, directory_entry_name_utf8);
601 it.CurrentEntry = directory_entry(directory_entry_path);
603 return std::error_code();
606 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
607 if (it.IterationHandle != 0)
608 // Closes the handle if it's valid.
609 ScopedFindHandle close(HANDLE(it.IterationHandle));
610 it.IterationHandle = 0;
611 it.CurrentEntry = directory_entry();
612 return std::error_code();
615 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
616 WIN32_FIND_DATAW FindData;
617 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
618 DWORD LastError = ::GetLastError();
620 if (LastError == ERROR_NO_MORE_FILES)
621 return detail::directory_iterator_destruct(it);
622 return mapWindowsError(LastError);
625 size_t FilenameLen = ::wcslen(FindData.cFileName);
626 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
627 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
628 FindData.cFileName[1] == L'.'))
629 return directory_iterator_increment(it);
631 SmallString<128> directory_entry_path_utf8;
632 if (std::error_code ec =
633 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
634 directory_entry_path_utf8))
637 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
638 return std::error_code();
641 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
642 SmallVector<wchar_t, 128> PathUTF16;
644 if (std::error_code EC = widenPath(Name, PathUTF16))
647 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
648 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
649 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
650 if (H == INVALID_HANDLE_VALUE) {
651 DWORD LastError = ::GetLastError();
652 std::error_code EC = mapWindowsError(LastError);
653 // Provide a better error message when trying to open directories.
654 // This only runs if we failed to open the file, so there is probably
655 // no performances issues.
656 if (LastError != ERROR_ACCESS_DENIED)
658 if (is_directory(Name))
659 return make_error_code(errc::is_a_directory);
663 int FD = ::_open_osfhandle(intptr_t(H), 0);
666 return mapWindowsError(ERROR_INVALID_HANDLE);
670 return std::error_code();
673 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
674 sys::fs::OpenFlags Flags, unsigned Mode) {
675 // Verify that we don't have both "append" and "excl".
676 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
677 "Cannot specify both 'excl' and 'append' file creation flags!");
679 SmallVector<wchar_t, 128> PathUTF16;
681 if (std::error_code EC = widenPath(Name, PathUTF16))
684 DWORD CreationDisposition;
686 CreationDisposition = CREATE_NEW;
687 else if (Flags & F_Append)
688 CreationDisposition = OPEN_ALWAYS;
690 CreationDisposition = CREATE_ALWAYS;
692 DWORD Access = GENERIC_WRITE;
694 Access |= GENERIC_READ;
696 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
697 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
698 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
700 if (H == INVALID_HANDLE_VALUE) {
701 DWORD LastError = ::GetLastError();
702 std::error_code EC = mapWindowsError(LastError);
703 // Provide a better error message when trying to open directories.
704 // This only runs if we failed to open the file, so there is probably
705 // no performances issues.
706 if (LastError != ERROR_ACCESS_DENIED)
708 if (is_directory(Name))
709 return make_error_code(errc::is_a_directory);
714 if (Flags & F_Append)
715 OpenFlags |= _O_APPEND;
718 OpenFlags |= _O_TEXT;
720 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
723 return mapWindowsError(ERROR_INVALID_HANDLE);
727 return std::error_code();
729 } // end namespace fs
733 bool home_directory(SmallVectorImpl<char> &result) {
734 wchar_t Path[MAX_PATH];
735 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
736 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
739 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
745 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
746 SmallVector<wchar_t, 128> NameUTF16;
747 if (windows::UTF8ToUTF16(Var, NameUTF16))
750 SmallVector<wchar_t, 1024> Buf;
755 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
759 // Try again with larger buffer.
760 } while (Size > Buf.capacity());
763 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
768 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
769 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
770 for (const char *Env : EnvironmentVariables) {
771 if (getTempDirEnvVar(Env, Res))
777 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
778 (void)ErasedOnReboot;
781 // Check whether the temporary directory is specified by an environment
783 if (getTempDirEnvVar(Result))
786 // Fall back to a system default.
787 const char *DefaultResult = "C:\\TEMP";
788 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
790 } // end namespace path
793 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
794 llvm::SmallVectorImpl<wchar_t> &utf16) {
796 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
797 utf8.size(), utf16.begin(), 0);
800 return mapWindowsError(::GetLastError());
802 utf16.reserve(len + 1);
805 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
806 utf8.size(), utf16.begin(), utf16.size());
809 return mapWindowsError(::GetLastError());
812 // Make utf16 null terminated.
816 return std::error_code();
820 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
822 llvm::SmallVectorImpl<char> &utf8) {
825 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
829 return mapWindowsError(::GetLastError());
834 // Now do the actual conversion.
835 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
836 utf8.size(), NULL, NULL);
839 return mapWindowsError(::GetLastError());
842 // Make utf8 null terminated.
846 return std::error_code();
849 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
850 llvm::SmallVectorImpl<char> &utf8) {
851 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
854 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
855 llvm::SmallVectorImpl<char> &utf8) {
856 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
858 } // end namespace windows
859 } // end namespace sys
860 } // end namespace llvm