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;
48 static std::error_code windows_error(DWORD E) {
49 return mapWindowsError(E);
52 static std::error_code TempDir(SmallVectorImpl<char> &Result) {
53 SmallVector<wchar_t, 64> Res;
55 DWORD Len = ::GetTempPathW(Res.capacity(), Res.begin());
58 return windows_error(::GetLastError());
60 if (Len > Res.capacity()) {
66 return UTF16ToUTF8(Res.begin(), Res.size(), Result);
69 static bool is_separator(const wchar_t value) {
83 std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
84 SmallVector<wchar_t, MAX_PATH> PathName;
85 DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
87 // A zero return value indicates a failure other than insufficient space.
91 // Insufficient space is determined by a return value equal to the size of
92 // the buffer passed in.
93 if (Size == PathName.capacity())
96 // On success, GetModuleFileNameW returns the number of characters written to
97 // the buffer not including the NULL terminator.
98 PathName.set_size(Size);
100 // Convert the result from UTF-16 to UTF-8.
101 SmallVector<char, MAX_PATH> PathNameUTF8;
102 if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
105 return std::string(PathNameUTF8.data());
108 UniqueID file_status::getUniqueID() const {
109 // The file is uniquely identified by the volume serial number along
110 // with the 64-bit file identifier.
111 uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) |
112 static_cast<uint64_t>(FileIndexLow);
114 return UniqueID(VolumeSerialNumber, FileID);
117 TimeValue file_status::getLastModificationTime() const {
119 UI.LowPart = LastWriteTimeLow;
120 UI.HighPart = LastWriteTimeHigh;
123 Ret.fromWin32Time(UI.QuadPart);
127 std::error_code current_path(SmallVectorImpl<char> &result) {
128 SmallVector<wchar_t, MAX_PATH> cur_path;
129 DWORD len = MAX_PATH;
132 cur_path.reserve(len);
133 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
135 // A zero return value indicates a failure other than insufficient space.
137 return windows_error(::GetLastError());
139 // If there's insufficient space, the len returned is larger than the len
141 } while (len > cur_path.capacity());
143 // On success, GetCurrentDirectoryW returns the number of characters not
144 // including the null-terminator.
145 cur_path.set_size(len);
146 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result);
149 std::error_code create_directory(const Twine &path, bool IgnoreExisting) {
150 SmallString<128> path_storage;
151 SmallVector<wchar_t, 128> path_utf16;
153 if (std::error_code ec =
154 UTF8ToUTF16(path.toStringRef(path_storage), path_utf16))
157 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
158 DWORD LastError = ::GetLastError();
159 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
160 return windows_error(LastError);
163 return std::error_code();
166 // We can't use symbolic links for windows.
167 std::error_code create_link(const Twine &to, const Twine &from) {
169 SmallString<128> from_storage;
170 SmallString<128> to_storage;
171 StringRef f = from.toStringRef(from_storage);
172 StringRef t = to.toStringRef(to_storage);
174 // Convert to utf-16.
175 SmallVector<wchar_t, 128> wide_from;
176 SmallVector<wchar_t, 128> wide_to;
177 if (std::error_code ec = UTF8ToUTF16(f, wide_from))
179 if (std::error_code ec = UTF8ToUTF16(t, wide_to))
182 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
183 return windows_error(::GetLastError());
185 return std::error_code();
188 std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
189 SmallString<128> path_storage;
190 SmallVector<wchar_t, 128> path_utf16;
193 if (std::error_code EC = status(path, ST)) {
194 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
196 return std::error_code();
199 if (std::error_code ec =
200 UTF8ToUTF16(path.toStringRef(path_storage), path_utf16))
203 if (ST.type() == file_type::directory_file) {
204 if (!::RemoveDirectoryW(c_str(path_utf16))) {
205 std::error_code EC = windows_error(::GetLastError());
206 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
209 return std::error_code();
211 if (!::DeleteFileW(c_str(path_utf16))) {
212 std::error_code EC = windows_error(::GetLastError());
213 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
216 return std::error_code();
219 std::error_code rename(const Twine &from, const Twine &to) {
221 SmallString<128> from_storage;
222 SmallString<128> to_storage;
223 StringRef f = from.toStringRef(from_storage);
224 StringRef t = to.toStringRef(to_storage);
226 // Convert to utf-16.
227 SmallVector<wchar_t, 128> wide_from;
228 SmallVector<wchar_t, 128> wide_to;
229 if (std::error_code ec = UTF8ToUTF16(f, wide_from))
231 if (std::error_code ec = UTF8ToUTF16(t, wide_to))
234 std::error_code ec = std::error_code();
235 for (int i = 0; i < 2000; i++) {
236 if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
237 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
238 return std::error_code();
239 DWORD LastError = ::GetLastError();
240 if (LastError != ERROR_ACCESS_DENIED)
242 // Retry MoveFile() at ACCESS_DENIED.
243 // System scanners (eg. indexer) might open the source file when
244 // It is written and closed.
251 std::error_code resize_file(const Twine &path, uint64_t size) {
252 SmallString<128> path_storage;
253 SmallVector<wchar_t, 128> path_utf16;
255 if (std::error_code ec =
256 UTF8ToUTF16(path.toStringRef(path_storage), path_utf16))
259 int fd = ::_wopen(path_utf16.begin(), O_BINARY | _O_RDWR, S_IWRITE);
261 return std::error_code(errno, std::generic_category());
262 #ifdef HAVE__CHSIZE_S
263 errno_t error = ::_chsize_s(fd, size);
265 errno_t error = ::_chsize(fd, size);
268 return std::error_code(error, std::generic_category());
271 std::error_code exists(const Twine &path, bool &result) {
272 SmallString<128> path_storage;
273 SmallVector<wchar_t, 128> path_utf16;
275 if (std::error_code ec =
276 UTF8ToUTF16(path.toStringRef(path_storage), path_utf16))
279 DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
281 if (attributes == INVALID_FILE_ATTRIBUTES) {
282 // See if the file didn't actually exist.
283 DWORD LastError = ::GetLastError();
284 if (LastError != ERROR_FILE_NOT_FOUND &&
285 LastError != ERROR_PATH_NOT_FOUND)
286 return windows_error(LastError);
290 return std::error_code();
293 bool can_write(const Twine &Path) {
294 // FIXME: take security attributes into account.
295 SmallString<128> PathStorage;
296 SmallVector<wchar_t, 128> PathUtf16;
298 if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
301 DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
302 return (Attr != INVALID_FILE_ATTRIBUTES) && !(Attr & FILE_ATTRIBUTE_READONLY);
305 bool can_execute(const Twine &Path) {
306 SmallString<128> PathStorage;
307 SmallVector<wchar_t, 128> PathUtf16;
309 if (UTF8ToUTF16(Path.toStringRef(PathStorage), PathUtf16))
312 DWORD Attr = ::GetFileAttributesW(PathUtf16.begin());
313 return Attr != INVALID_FILE_ATTRIBUTES;
316 bool equivalent(file_status A, file_status B) {
317 assert(status_known(A) && status_known(B));
318 return A.FileIndexHigh == B.FileIndexHigh &&
319 A.FileIndexLow == B.FileIndexLow &&
320 A.FileSizeHigh == B.FileSizeHigh &&
321 A.FileSizeLow == B.FileSizeLow &&
322 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
323 A.LastWriteTimeLow == B.LastWriteTimeLow &&
324 A.VolumeSerialNumber == B.VolumeSerialNumber;
327 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
328 file_status fsA, fsB;
329 if (std::error_code ec = status(A, fsA))
331 if (std::error_code ec = status(B, fsB))
333 result = equivalent(fsA, fsB);
334 return std::error_code();
337 static bool isReservedName(StringRef path) {
338 // This list of reserved names comes from MSDN, at:
339 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
340 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
341 "com1", "com2", "com3", "com4", "com5", "com6",
342 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
343 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
345 // First, check to see if this is a device namespace, which always
346 // starts with \\.\, since device namespaces are not legal file paths.
347 if (path.startswith("\\\\.\\"))
350 // Then compare against the list of ancient reserved names
351 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
352 if (path.equals_lower(sReservedNames[i]))
356 // The path isn't what we consider reserved.
360 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
361 if (FileHandle == INVALID_HANDLE_VALUE)
362 goto handle_status_error;
364 switch (::GetFileType(FileHandle)) {
366 llvm_unreachable("Don't know anything about this file type");
367 case FILE_TYPE_UNKNOWN: {
368 DWORD Err = ::GetLastError();
370 return windows_error(Err);
371 Result = file_status(file_type::type_unknown);
372 return std::error_code();
377 Result = file_status(file_type::character_file);
378 return std::error_code();
380 Result = file_status(file_type::fifo_file);
381 return std::error_code();
384 BY_HANDLE_FILE_INFORMATION Info;
385 if (!::GetFileInformationByHandle(FileHandle, &Info))
386 goto handle_status_error;
389 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
390 ? file_type::directory_file
391 : file_type::regular_file;
393 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
394 Info.ftLastWriteTime.dwLowDateTime,
395 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
396 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
397 return std::error_code();
401 DWORD LastError = ::GetLastError();
402 if (LastError == ERROR_FILE_NOT_FOUND ||
403 LastError == ERROR_PATH_NOT_FOUND)
404 Result = file_status(file_type::file_not_found);
405 else if (LastError == ERROR_SHARING_VIOLATION)
406 Result = file_status(file_type::type_unknown);
408 Result = file_status(file_type::status_error);
409 return windows_error(LastError);
412 std::error_code status(const Twine &path, file_status &result) {
413 SmallString<128> path_storage;
414 SmallVector<wchar_t, 128> path_utf16;
416 StringRef path8 = path.toStringRef(path_storage);
417 if (isReservedName(path8)) {
418 result = file_status(file_type::character_file);
419 return std::error_code();
422 if (std::error_code ec = UTF8ToUTF16(path8, path_utf16))
425 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
426 if (attr == INVALID_FILE_ATTRIBUTES)
427 return getStatus(INVALID_HANDLE_VALUE, result);
429 // Handle reparse points.
430 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
432 ::CreateFileW(path_utf16.begin(),
433 0, // Attributes only.
434 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
437 FILE_FLAG_BACKUP_SEMANTICS,
440 return getStatus(INVALID_HANDLE_VALUE, result);
444 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
445 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
446 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
448 return getStatus(INVALID_HANDLE_VALUE, result);
450 return getStatus(h, result);
453 std::error_code status(int FD, file_status &Result) {
454 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
455 return getStatus(FileHandle, Result);
458 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
460 UI.QuadPart = Time.toWin32Time();
462 FT.dwLowDateTime = UI.LowPart;
463 FT.dwHighDateTime = UI.HighPart;
464 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
465 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
466 return windows_error(::GetLastError());
467 return std::error_code();
470 std::error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
472 // Make sure that the requested size fits within SIZE_T.
473 if (Size > std::numeric_limits<SIZE_T>::max()) {
474 if (FileDescriptor) {
476 _close(FileDescriptor);
478 ::CloseHandle(FileHandle);
479 return make_error_code(errc::invalid_argument);
484 case readonly: flprotect = PAGE_READONLY; break;
485 case readwrite: flprotect = PAGE_READWRITE; break;
486 case priv: flprotect = PAGE_WRITECOPY; break;
490 ::CreateFileMappingW(FileHandle, 0, flprotect,
491 (Offset + Size) >> 32,
492 (Offset + Size) & 0xffffffff,
494 if (FileMappingHandle == NULL) {
495 std::error_code ec = windows_error(GetLastError());
496 if (FileDescriptor) {
498 _close(FileDescriptor);
500 ::CloseHandle(FileHandle);
504 DWORD dwDesiredAccess;
506 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
507 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
508 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
510 Mapping = ::MapViewOfFile(FileMappingHandle,
515 if (Mapping == NULL) {
516 std::error_code ec = windows_error(GetLastError());
517 ::CloseHandle(FileMappingHandle);
518 if (FileDescriptor) {
520 _close(FileDescriptor);
522 ::CloseHandle(FileHandle);
527 MEMORY_BASIC_INFORMATION mbi;
528 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
530 std::error_code ec = windows_error(GetLastError());
531 ::UnmapViewOfFile(Mapping);
532 ::CloseHandle(FileMappingHandle);
533 if (FileDescriptor) {
535 _close(FileDescriptor);
537 ::CloseHandle(FileHandle);
540 Size = mbi.RegionSize;
543 // Close all the handles except for the view. It will keep the other handles
545 ::CloseHandle(FileMappingHandle);
546 if (FileDescriptor) {
548 _close(FileDescriptor); // Also closes FileHandle.
550 ::CloseHandle(FileHandle);
551 return std::error_code();
554 mapped_file_region::mapped_file_region(const Twine &path,
563 , FileHandle(INVALID_HANDLE_VALUE)
564 , FileMappingHandle() {
565 SmallString<128> path_storage;
566 SmallVector<wchar_t, 128> path_utf16;
568 // Convert path to UTF-16.
569 if ((ec = UTF8ToUTF16(path.toStringRef(path_storage), path_utf16)))
572 // Get file handle for creating a file mapping.
573 FileHandle = ::CreateFileW(c_str(path_utf16),
574 Mode == readonly ? GENERIC_READ
575 : GENERIC_READ | GENERIC_WRITE,
576 Mode == readonly ? FILE_SHARE_READ
579 Mode == readonly ? OPEN_EXISTING
581 Mode == readonly ? FILE_ATTRIBUTE_READONLY
582 : FILE_ATTRIBUTE_NORMAL,
584 if (FileHandle == INVALID_HANDLE_VALUE) {
585 ec = windows_error(::GetLastError());
590 ec = init(FileDescriptor, true, offset);
592 Mapping = FileMappingHandle = 0;
593 FileHandle = INVALID_HANDLE_VALUE;
598 mapped_file_region::mapped_file_region(int fd,
608 , FileHandle(INVALID_HANDLE_VALUE)
609 , FileMappingHandle() {
610 FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
611 if (FileHandle == INVALID_HANDLE_VALUE) {
613 _close(FileDescriptor);
615 ec = make_error_code(errc::bad_file_descriptor);
619 ec = init(FileDescriptor, closefd, offset);
621 Mapping = FileMappingHandle = 0;
622 FileHandle = INVALID_HANDLE_VALUE;
627 mapped_file_region::~mapped_file_region() {
629 ::UnmapViewOfFile(Mapping);
632 mapped_file_region::mapped_file_region(mapped_file_region &&other)
635 , Mapping(other.Mapping)
636 , FileDescriptor(other.FileDescriptor)
637 , FileHandle(other.FileHandle)
638 , FileMappingHandle(other.FileMappingHandle) {
639 other.Mapping = other.FileMappingHandle = 0;
640 other.FileHandle = INVALID_HANDLE_VALUE;
641 other.FileDescriptor = 0;
644 mapped_file_region::mapmode mapped_file_region::flags() const {
645 assert(Mapping && "Mapping failed but used anyway!");
649 uint64_t mapped_file_region::size() const {
650 assert(Mapping && "Mapping failed but used anyway!");
654 char *mapped_file_region::data() const {
655 assert(Mode != readonly && "Cannot get non-const data for readonly mapping!");
656 assert(Mapping && "Mapping failed but used anyway!");
657 return reinterpret_cast<char*>(Mapping);
660 const char *mapped_file_region::const_data() const {
661 assert(Mapping && "Mapping failed but used anyway!");
662 return reinterpret_cast<const char*>(Mapping);
665 int mapped_file_region::alignment() {
667 ::GetSystemInfo(&SysInfo);
668 return SysInfo.dwAllocationGranularity;
671 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
673 SmallVector<wchar_t, 128> path_utf16;
675 if (std::error_code ec = UTF8ToUTF16(path, path_utf16))
678 // Convert path to the format that Windows is happy with.
679 if (path_utf16.size() > 0 &&
680 !is_separator(path_utf16[path.size() - 1]) &&
681 path_utf16[path.size() - 1] != L':') {
682 path_utf16.push_back(L'\\');
683 path_utf16.push_back(L'*');
685 path_utf16.push_back(L'*');
688 // Get the first directory entry.
689 WIN32_FIND_DATAW FirstFind;
690 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
692 return windows_error(::GetLastError());
694 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
695 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
696 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
697 FirstFind.cFileName[1] == L'.'))
698 if (!::FindNextFileW(FindHandle, &FirstFind)) {
699 DWORD LastError = ::GetLastError();
701 if (LastError == ERROR_NO_MORE_FILES)
702 return detail::directory_iterator_destruct(it);
703 return windows_error(LastError);
705 FilenameLen = ::wcslen(FirstFind.cFileName);
707 // Construct the current directory entry.
708 SmallString<128> directory_entry_name_utf8;
709 if (std::error_code ec =
710 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
711 directory_entry_name_utf8))
714 it.IterationHandle = intptr_t(FindHandle.take());
715 SmallString<128> directory_entry_path(path);
716 path::append(directory_entry_path, directory_entry_name_utf8.str());
717 it.CurrentEntry = directory_entry(directory_entry_path.str());
719 return std::error_code();
722 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
723 if (it.IterationHandle != 0)
724 // Closes the handle if it's valid.
725 ScopedFindHandle close(HANDLE(it.IterationHandle));
726 it.IterationHandle = 0;
727 it.CurrentEntry = directory_entry();
728 return std::error_code();
731 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
732 WIN32_FIND_DATAW FindData;
733 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
734 DWORD LastError = ::GetLastError();
736 if (LastError == ERROR_NO_MORE_FILES)
737 return detail::directory_iterator_destruct(it);
738 return windows_error(LastError);
741 size_t FilenameLen = ::wcslen(FindData.cFileName);
742 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
743 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
744 FindData.cFileName[1] == L'.'))
745 return directory_iterator_increment(it);
747 SmallString<128> directory_entry_path_utf8;
748 if (std::error_code ec =
749 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
750 directory_entry_path_utf8))
753 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
754 return std::error_code();
757 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
758 SmallString<128> PathStorage;
759 SmallVector<wchar_t, 128> PathUTF16;
761 if (std::error_code EC =
762 UTF8ToUTF16(Name.toStringRef(PathStorage), PathUTF16))
765 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
766 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
767 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
768 if (H == INVALID_HANDLE_VALUE) {
769 DWORD LastError = ::GetLastError();
770 std::error_code EC = windows_error(LastError);
771 // Provide a better error message when trying to open directories.
772 // This only runs if we failed to open the file, so there is probably
773 // no performances issues.
774 if (LastError != ERROR_ACCESS_DENIED)
776 if (is_directory(Name))
777 return make_error_code(errc::is_a_directory);
781 int FD = ::_open_osfhandle(intptr_t(H), 0);
784 return windows_error(ERROR_INVALID_HANDLE);
788 return std::error_code();
791 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
792 sys::fs::OpenFlags Flags, unsigned Mode) {
793 // Verify that we don't have both "append" and "excl".
794 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
795 "Cannot specify both 'excl' and 'append' file creation flags!");
797 SmallString<128> PathStorage;
798 SmallVector<wchar_t, 128> PathUTF16;
800 if (std::error_code EC =
801 UTF8ToUTF16(Name.toStringRef(PathStorage), PathUTF16))
804 DWORD CreationDisposition;
806 CreationDisposition = CREATE_NEW;
807 else if (Flags & F_Append)
808 CreationDisposition = OPEN_ALWAYS;
810 CreationDisposition = CREATE_ALWAYS;
812 DWORD Access = GENERIC_WRITE;
814 Access |= GENERIC_READ;
816 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
817 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
818 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
820 if (H == INVALID_HANDLE_VALUE) {
821 DWORD LastError = ::GetLastError();
822 std::error_code EC = windows_error(LastError);
823 // Provide a better error message when trying to open directories.
824 // This only runs if we failed to open the file, so there is probably
825 // no performances issues.
826 if (LastError != ERROR_ACCESS_DENIED)
828 if (is_directory(Name))
829 return make_error_code(errc::is_a_directory);
834 if (Flags & F_Append)
835 OpenFlags |= _O_APPEND;
838 OpenFlags |= _O_TEXT;
840 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
843 return windows_error(ERROR_INVALID_HANDLE);
847 return std::error_code();
849 } // end namespace fs
853 bool home_directory(SmallVectorImpl<char> &result) {
854 wchar_t Path[MAX_PATH];
855 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
856 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
859 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
865 } // end namespace path
868 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
869 llvm::SmallVectorImpl<wchar_t> &utf16) {
871 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
872 utf8.size(), utf16.begin(), 0);
875 return windows_error(::GetLastError());
877 utf16.reserve(len + 1);
880 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
881 utf8.size(), utf16.begin(), utf16.size());
884 return windows_error(::GetLastError());
887 // Make utf16 null terminated.
891 return std::error_code();
894 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
895 llvm::SmallVectorImpl<char> &utf8) {
898 int len = ::WideCharToMultiByte(CP_UTF8, 0, utf16, utf16_len, utf8.begin(),
902 return windows_error(::GetLastError());
907 // Now do the actual conversion.
908 len = ::WideCharToMultiByte(CP_UTF8, 0, utf16, utf16_len, utf8.data(),
909 utf8.size(), NULL, NULL);
912 return windows_error(::GetLastError());
915 // Make utf8 null terminated.
919 return std::error_code();
921 } // end namespace windows
922 } // end namespace sys
923 } // end namespace llvm