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 bool is_separator(const wchar_t value) {
62 // Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the
63 // path is longer than CreateDirectory can tolerate, make it absolute and
64 // prefixed by '\\?\'.
65 static std::error_code widenPath(const Twine &Path8,
66 SmallVectorImpl<wchar_t> &Path16) {
67 const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename.
69 // Several operations would convert Path8 to SmallString; more efficient to
70 // do it once up front.
71 SmallString<128> Path8Str;
72 Path8.toVector(Path8Str);
74 // If we made this path absolute, how much longer would it get?
76 if (llvm::sys::path::is_absolute(Twine(Path8Str)))
77 CurPathLen = 0; // No contribution from current_path needed.
79 CurPathLen = ::GetCurrentDirectoryW(0, NULL);
81 return windows_error(::GetLastError());
84 // Would the absolute path be longer than our limit?
85 if ((Path8Str.size() + CurPathLen) >= MaxDirLen &&
86 !Path8Str.startswith("\\\\?\\")) {
87 SmallString<2*MAX_PATH> FullPath("\\\\?\\");
89 SmallString<80> CurPath;
90 if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
92 FullPath.append(CurPath);
94 // Traverse the requested path, canonicalizing . and .. as we go (because
95 // the \\?\ prefix is documented to treat them as real components).
96 // The iterators don't report separators and append() always attaches
97 // preferred_separator so we don't need to call native() on the result.
98 for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str),
99 E = llvm::sys::path::end(Path8Str);
101 if (I->size() == 1 && *I == ".")
103 if (I->size() == 2 && *I == "..")
104 llvm::sys::path::remove_filename(FullPath);
106 llvm::sys::path::append(FullPath, *I);
108 return UTF8ToUTF16(FullPath, Path16);
111 // Just use the caller's original path.
112 return UTF8ToUTF16(Path8Str, Path16);
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 windows_error(::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 windows_error(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 windows_error(::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 = windows_error(::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 = windows_error(::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 if (LastError != ERROR_ACCESS_DENIED)
262 // Retry MoveFile() at ACCESS_DENIED.
263 // System scanners (eg. indexer) might open the source file when
264 // It is written and closed.
271 std::error_code resize_file(const Twine &path, uint64_t size) {
272 SmallVector<wchar_t, 128> path_utf16;
274 if (std::error_code ec = widenPath(path, path_utf16))
277 int fd = ::_wopen(path_utf16.begin(), O_BINARY | _O_RDWR, S_IWRITE);
279 return std::error_code(errno, std::generic_category());
280 #ifdef HAVE__CHSIZE_S
281 errno_t error = ::_chsize_s(fd, size);
283 errno_t error = ::_chsize(fd, size);
286 return std::error_code(error, std::generic_category());
289 std::error_code access(const Twine &Path, AccessMode Mode) {
290 SmallVector<wchar_t, 128> PathUtf16;
292 if (std::error_code EC = widenPath(Path, PathUtf16))
295 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
297 if (Attributes == INVALID_FILE_ATTRIBUTES) {
298 // See if the file didn't actually exist.
299 DWORD LastError = ::GetLastError();
300 if (LastError != ERROR_FILE_NOT_FOUND &&
301 LastError != ERROR_PATH_NOT_FOUND)
302 return windows_error(LastError);
303 return errc::no_such_file_or_directory;
306 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
307 return errc::permission_denied;
309 return std::error_code();
312 bool equivalent(file_status A, file_status B) {
313 assert(status_known(A) && status_known(B));
314 return A.FileIndexHigh == B.FileIndexHigh &&
315 A.FileIndexLow == B.FileIndexLow &&
316 A.FileSizeHigh == B.FileSizeHigh &&
317 A.FileSizeLow == B.FileSizeLow &&
318 A.LastWriteTimeHigh == B.LastWriteTimeHigh &&
319 A.LastWriteTimeLow == B.LastWriteTimeLow &&
320 A.VolumeSerialNumber == B.VolumeSerialNumber;
323 std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
324 file_status fsA, fsB;
325 if (std::error_code ec = status(A, fsA))
327 if (std::error_code ec = status(B, fsB))
329 result = equivalent(fsA, fsB);
330 return std::error_code();
333 static bool isReservedName(StringRef path) {
334 // This list of reserved names comes from MSDN, at:
335 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
336 static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
337 "com1", "com2", "com3", "com4", "com5", "com6",
338 "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
339 "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
341 // First, check to see if this is a device namespace, which always
342 // starts with \\.\, since device namespaces are not legal file paths.
343 if (path.startswith("\\\\.\\"))
346 // Then compare against the list of ancient reserved names
347 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
348 if (path.equals_lower(sReservedNames[i]))
352 // The path isn't what we consider reserved.
356 static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
357 if (FileHandle == INVALID_HANDLE_VALUE)
358 goto handle_status_error;
360 switch (::GetFileType(FileHandle)) {
362 llvm_unreachable("Don't know anything about this file type");
363 case FILE_TYPE_UNKNOWN: {
364 DWORD Err = ::GetLastError();
366 return windows_error(Err);
367 Result = file_status(file_type::type_unknown);
368 return std::error_code();
373 Result = file_status(file_type::character_file);
374 return std::error_code();
376 Result = file_status(file_type::fifo_file);
377 return std::error_code();
380 BY_HANDLE_FILE_INFORMATION Info;
381 if (!::GetFileInformationByHandle(FileHandle, &Info))
382 goto handle_status_error;
385 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
386 ? file_type::directory_file
387 : file_type::regular_file;
389 file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
390 Info.ftLastWriteTime.dwLowDateTime,
391 Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
392 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
393 return std::error_code();
397 DWORD LastError = ::GetLastError();
398 if (LastError == ERROR_FILE_NOT_FOUND ||
399 LastError == ERROR_PATH_NOT_FOUND)
400 Result = file_status(file_type::file_not_found);
401 else if (LastError == ERROR_SHARING_VIOLATION)
402 Result = file_status(file_type::type_unknown);
404 Result = file_status(file_type::status_error);
405 return windows_error(LastError);
408 std::error_code status(const Twine &path, file_status &result) {
409 SmallString<128> path_storage;
410 SmallVector<wchar_t, 128> path_utf16;
412 StringRef path8 = path.toStringRef(path_storage);
413 if (isReservedName(path8)) {
414 result = file_status(file_type::character_file);
415 return std::error_code();
418 if (std::error_code ec = widenPath(path8, path_utf16))
421 DWORD attr = ::GetFileAttributesW(path_utf16.begin());
422 if (attr == INVALID_FILE_ATTRIBUTES)
423 return getStatus(INVALID_HANDLE_VALUE, result);
425 // Handle reparse points.
426 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
428 ::CreateFileW(path_utf16.begin(),
429 0, // Attributes only.
430 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
433 FILE_FLAG_BACKUP_SEMANTICS,
436 return getStatus(INVALID_HANDLE_VALUE, result);
440 ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
441 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
442 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
444 return getStatus(INVALID_HANDLE_VALUE, result);
446 return getStatus(h, result);
449 std::error_code status(int FD, file_status &Result) {
450 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
451 return getStatus(FileHandle, Result);
454 std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
456 UI.QuadPart = Time.toWin32Time();
458 FT.dwLowDateTime = UI.LowPart;
459 FT.dwHighDateTime = UI.HighPart;
460 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
461 if (!SetFileTime(FileHandle, NULL, &FT, &FT))
462 return windows_error(::GetLastError());
463 return std::error_code();
466 std::error_code mapped_file_region::init(int FD, bool CloseFD, uint64_t Offset) {
468 // Make sure that the requested size fits within SIZE_T.
469 if (Size > std::numeric_limits<SIZE_T>::max()) {
470 if (FileDescriptor) {
472 _close(FileDescriptor);
474 ::CloseHandle(FileHandle);
475 return make_error_code(errc::invalid_argument);
480 case readonly: flprotect = PAGE_READONLY; break;
481 case readwrite: flprotect = PAGE_READWRITE; break;
482 case priv: flprotect = PAGE_WRITECOPY; break;
486 ::CreateFileMappingW(FileHandle, 0, flprotect,
487 (Offset + Size) >> 32,
488 (Offset + Size) & 0xffffffff,
490 if (FileMappingHandle == NULL) {
491 std::error_code ec = windows_error(GetLastError());
492 if (FileDescriptor) {
494 _close(FileDescriptor);
496 ::CloseHandle(FileHandle);
500 DWORD dwDesiredAccess;
502 case readonly: dwDesiredAccess = FILE_MAP_READ; break;
503 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
504 case priv: dwDesiredAccess = FILE_MAP_COPY; break;
506 Mapping = ::MapViewOfFile(FileMappingHandle,
511 if (Mapping == NULL) {
512 std::error_code ec = windows_error(GetLastError());
513 ::CloseHandle(FileMappingHandle);
514 if (FileDescriptor) {
516 _close(FileDescriptor);
518 ::CloseHandle(FileHandle);
523 MEMORY_BASIC_INFORMATION mbi;
524 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
526 std::error_code ec = windows_error(GetLastError());
527 ::UnmapViewOfFile(Mapping);
528 ::CloseHandle(FileMappingHandle);
529 if (FileDescriptor) {
531 _close(FileDescriptor);
533 ::CloseHandle(FileHandle);
536 Size = mbi.RegionSize;
539 // Close all the handles except for the view. It will keep the other handles
541 ::CloseHandle(FileMappingHandle);
542 if (FileDescriptor) {
544 _close(FileDescriptor); // Also closes FileHandle.
546 ::CloseHandle(FileHandle);
547 return std::error_code();
550 mapped_file_region::mapped_file_region(const Twine &path,
559 , FileHandle(INVALID_HANDLE_VALUE)
560 , FileMappingHandle() {
561 SmallVector<wchar_t, 128> path_utf16;
563 // Convert path to UTF-16.
564 if (ec = widenPath(path, path_utf16))
567 // Get file handle for creating a file mapping.
568 FileHandle = ::CreateFileW(c_str(path_utf16),
569 Mode == readonly ? GENERIC_READ
570 : GENERIC_READ | GENERIC_WRITE,
571 Mode == readonly ? FILE_SHARE_READ
574 Mode == readonly ? OPEN_EXISTING
576 Mode == readonly ? FILE_ATTRIBUTE_READONLY
577 : FILE_ATTRIBUTE_NORMAL,
579 if (FileHandle == INVALID_HANDLE_VALUE) {
580 ec = windows_error(::GetLastError());
585 ec = init(FileDescriptor, true, offset);
587 Mapping = FileMappingHandle = 0;
588 FileHandle = INVALID_HANDLE_VALUE;
593 mapped_file_region::mapped_file_region(int fd,
603 , FileHandle(INVALID_HANDLE_VALUE)
604 , FileMappingHandle() {
605 FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(fd));
606 if (FileHandle == INVALID_HANDLE_VALUE) {
608 _close(FileDescriptor);
610 ec = make_error_code(errc::bad_file_descriptor);
614 ec = init(FileDescriptor, closefd, offset);
616 Mapping = FileMappingHandle = 0;
617 FileHandle = INVALID_HANDLE_VALUE;
622 mapped_file_region::~mapped_file_region() {
624 ::UnmapViewOfFile(Mapping);
627 mapped_file_region::mapped_file_region(mapped_file_region &&other)
630 , Mapping(other.Mapping)
631 , FileDescriptor(other.FileDescriptor)
632 , FileHandle(other.FileHandle)
633 , FileMappingHandle(other.FileMappingHandle) {
634 other.Mapping = other.FileMappingHandle = 0;
635 other.FileHandle = INVALID_HANDLE_VALUE;
636 other.FileDescriptor = 0;
639 mapped_file_region::mapmode mapped_file_region::flags() const {
640 assert(Mapping && "Mapping failed but used anyway!");
644 uint64_t mapped_file_region::size() const {
645 assert(Mapping && "Mapping failed but used anyway!");
649 char *mapped_file_region::data() const {
650 assert(Mode != readonly && "Cannot get non-const data for readonly mapping!");
651 assert(Mapping && "Mapping failed but used anyway!");
652 return reinterpret_cast<char*>(Mapping);
655 const char *mapped_file_region::const_data() const {
656 assert(Mapping && "Mapping failed but used anyway!");
657 return reinterpret_cast<const char*>(Mapping);
660 int mapped_file_region::alignment() {
662 ::GetSystemInfo(&SysInfo);
663 return SysInfo.dwAllocationGranularity;
666 std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
668 SmallVector<wchar_t, 128> path_utf16;
670 if (std::error_code ec = widenPath(path, path_utf16))
673 // Convert path to the format that Windows is happy with.
674 if (path_utf16.size() > 0 &&
675 !is_separator(path_utf16[path.size() - 1]) &&
676 path_utf16[path.size() - 1] != L':') {
677 path_utf16.push_back(L'\\');
678 path_utf16.push_back(L'*');
680 path_utf16.push_back(L'*');
683 // Get the first directory entry.
684 WIN32_FIND_DATAW FirstFind;
685 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
687 return windows_error(::GetLastError());
689 size_t FilenameLen = ::wcslen(FirstFind.cFileName);
690 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
691 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
692 FirstFind.cFileName[1] == L'.'))
693 if (!::FindNextFileW(FindHandle, &FirstFind)) {
694 DWORD LastError = ::GetLastError();
696 if (LastError == ERROR_NO_MORE_FILES)
697 return detail::directory_iterator_destruct(it);
698 return windows_error(LastError);
700 FilenameLen = ::wcslen(FirstFind.cFileName);
702 // Construct the current directory entry.
703 SmallString<128> directory_entry_name_utf8;
704 if (std::error_code ec =
705 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
706 directory_entry_name_utf8))
709 it.IterationHandle = intptr_t(FindHandle.take());
710 SmallString<128> directory_entry_path(path);
711 path::append(directory_entry_path, directory_entry_name_utf8.str());
712 it.CurrentEntry = directory_entry(directory_entry_path.str());
714 return std::error_code();
717 std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
718 if (it.IterationHandle != 0)
719 // Closes the handle if it's valid.
720 ScopedFindHandle close(HANDLE(it.IterationHandle));
721 it.IterationHandle = 0;
722 it.CurrentEntry = directory_entry();
723 return std::error_code();
726 std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
727 WIN32_FIND_DATAW FindData;
728 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
729 DWORD LastError = ::GetLastError();
731 if (LastError == ERROR_NO_MORE_FILES)
732 return detail::directory_iterator_destruct(it);
733 return windows_error(LastError);
736 size_t FilenameLen = ::wcslen(FindData.cFileName);
737 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
738 (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
739 FindData.cFileName[1] == L'.'))
740 return directory_iterator_increment(it);
742 SmallString<128> directory_entry_path_utf8;
743 if (std::error_code ec =
744 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
745 directory_entry_path_utf8))
748 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
749 return std::error_code();
752 std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
753 SmallVector<wchar_t, 128> PathUTF16;
755 if (std::error_code EC = widenPath(Name, PathUTF16))
758 HANDLE H = ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
759 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
760 OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
761 if (H == INVALID_HANDLE_VALUE) {
762 DWORD LastError = ::GetLastError();
763 std::error_code EC = windows_error(LastError);
764 // Provide a better error message when trying to open directories.
765 // This only runs if we failed to open the file, so there is probably
766 // no performances issues.
767 if (LastError != ERROR_ACCESS_DENIED)
769 if (is_directory(Name))
770 return make_error_code(errc::is_a_directory);
774 int FD = ::_open_osfhandle(intptr_t(H), 0);
777 return windows_error(ERROR_INVALID_HANDLE);
781 return std::error_code();
784 std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
785 sys::fs::OpenFlags Flags, unsigned Mode) {
786 // Verify that we don't have both "append" and "excl".
787 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
788 "Cannot specify both 'excl' and 'append' file creation flags!");
790 SmallVector<wchar_t, 128> PathUTF16;
792 if (std::error_code EC = widenPath(Name, PathUTF16))
795 DWORD CreationDisposition;
797 CreationDisposition = CREATE_NEW;
798 else if (Flags & F_Append)
799 CreationDisposition = OPEN_ALWAYS;
801 CreationDisposition = CREATE_ALWAYS;
803 DWORD Access = GENERIC_WRITE;
805 Access |= GENERIC_READ;
807 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
808 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
809 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
811 if (H == INVALID_HANDLE_VALUE) {
812 DWORD LastError = ::GetLastError();
813 std::error_code EC = windows_error(LastError);
814 // Provide a better error message when trying to open directories.
815 // This only runs if we failed to open the file, so there is probably
816 // no performances issues.
817 if (LastError != ERROR_ACCESS_DENIED)
819 if (is_directory(Name))
820 return make_error_code(errc::is_a_directory);
825 if (Flags & F_Append)
826 OpenFlags |= _O_APPEND;
829 OpenFlags |= _O_TEXT;
831 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
834 return windows_error(ERROR_INVALID_HANDLE);
838 return std::error_code();
840 } // end namespace fs
844 bool home_directory(SmallVectorImpl<char> &result) {
845 wchar_t Path[MAX_PATH];
846 if (::SHGetFolderPathW(0, CSIDL_APPDATA | CSIDL_FLAG_CREATE, 0,
847 /*SHGFP_TYPE_CURRENT*/0, Path) != S_OK)
850 if (UTF16ToUTF8(Path, ::wcslen(Path), result))
856 static bool getTempDirEnvVar(const char *Var, SmallVectorImpl<char> &Res) {
857 SmallVector<wchar_t, 128> NameUTF16;
858 if (windows::UTF8ToUTF16(Var, NameUTF16))
861 SmallVector<wchar_t, 1024> Buf;
866 GetEnvironmentVariableW(NameUTF16.data(), Buf.data(), Buf.capacity());
870 // Try again with larger buffer.
871 } while (Size > Buf.capacity());
874 if (windows::UTF16ToUTF8(Buf.data(), Size, Res))
879 static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
880 const char *EnvironmentVariables[] = {"TMP", "TEMP", "USERPROFILE"};
881 for (const char *Env : EnvironmentVariables) {
882 if (getTempDirEnvVar(Env, Res))
888 void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
889 (void)ErasedOnReboot;
892 // Check whether the temporary directory is specified by an environment
894 if (getTempDirEnvVar(Result))
897 // Fall back to a system default.
898 const char *DefaultResult = "C:\\TEMP";
899 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
901 } // end namespace path
904 std::error_code UTF8ToUTF16(llvm::StringRef utf8,
905 llvm::SmallVectorImpl<wchar_t> &utf16) {
907 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
908 utf8.size(), utf16.begin(), 0);
911 return windows_error(::GetLastError());
913 utf16.reserve(len + 1);
916 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
917 utf8.size(), utf16.begin(), utf16.size());
920 return windows_error(::GetLastError());
923 // Make utf16 null terminated.
927 return std::error_code();
931 std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
933 llvm::SmallVectorImpl<char> &utf8) {
936 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
940 return windows_error(::GetLastError());
945 // Now do the actual conversion.
946 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
947 utf8.size(), NULL, NULL);
950 return windows_error(::GetLastError());
953 // Make utf8 null terminated.
957 return std::error_code();
960 std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
961 llvm::SmallVectorImpl<char> &utf8) {
962 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
965 std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
966 llvm::SmallVectorImpl<char> &utf8) {
967 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
969 } // end namespace windows
970 } // end namespace sys
971 } // end namespace llvm