1//===- llvm/Support/Windows/Path.inc - Windows Path Impl --------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Windows specific implementation of the Path API.
11//
12//===----------------------------------------------------------------------===//
13
14//===----------------------------------------------------------------------===//
15//=== WARNING: Implementation here must contain only generic Windows code that
16//===          is guaranteed to work on *all* Windows variants.
17//===----------------------------------------------------------------------===//
18
19#include "llvm/ADT/STLExtras.h"
20#include "llvm/Support/WindowsError.h"
21#include <fcntl.h>
22#include <io.h>
23#include <sys/stat.h>
24#include <sys/types.h>
25
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"
29#include <shlobj.h>
30
31#undef max
32
33// MinGW doesn't define this.
34#ifndef _ERRNO_T_DEFINED
35#define _ERRNO_T_DEFINED
36typedef int errno_t;
37#endif
38
39#ifdef _MSC_VER
40# pragma comment(lib, "advapi32.lib")  // This provides CryptAcquireContextW.
41#endif
42
43using namespace llvm;
44
45using llvm::sys::windows::UTF8ToUTF16;
46using llvm::sys::windows::UTF16ToUTF8;
47using llvm::sys::path::widenPath;
48
49static bool is_separator(const wchar_t value) {
50  switch (value) {
51  case L'\\':
52  case L'/':
53    return true;
54  default:
55    return false;
56  }
57}
58
59namespace llvm {
60namespace sys  {
61namespace path {
62
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 '\\?\'.
66std::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.
69
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);
74
75  // If we made this path absolute, how much longer would it get?
76  size_t CurPathLen;
77  if (llvm::sys::path::is_absolute(Twine(Path8Str)))
78    CurPathLen = 0; // No contribution from current_path needed.
79  else {
80    CurPathLen = ::GetCurrentDirectoryW(0, NULL);
81    if (CurPathLen == 0)
82      return mapWindowsError(::GetLastError());
83  }
84
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("\\\\?\\");
89    if (CurPathLen) {
90      SmallString<80> CurPath;
91      if (std::error_code EC = llvm::sys::fs::current_path(CurPath))
92        return EC;
93      FullPath.append(CurPath);
94    }
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);
101                                         I != E; ++I) {
102      if (I->size() == 1 && *I == ".")
103        continue;
104      if (I->size() == 2 && *I == "..")
105        llvm::sys::path::remove_filename(FullPath);
106      else
107        llvm::sys::path::append(FullPath, *I);
108    }
109    return UTF8ToUTF16(FullPath, Path16);
110  }
111
112  // Just use the caller's original path.
113  return UTF8ToUTF16(Path8Str, Path16);
114}
115} // end namespace path
116
117namespace fs {
118
119std::string getMainExecutable(const char *argv0, void *MainExecAddr) {
120  SmallVector<wchar_t, MAX_PATH> PathName;
121  DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity());
122
123  // A zero return value indicates a failure other than insufficient space.
124  if (Size == 0)
125    return "";
126
127  // Insufficient space is determined by a return value equal to the size of
128  // the buffer passed in.
129  if (Size == PathName.capacity())
130    return "";
131
132  // On success, GetModuleFileNameW returns the number of characters written to
133  // the buffer not including the NULL terminator.
134  PathName.set_size(Size);
135
136  // Convert the result from UTF-16 to UTF-8.
137  SmallVector<char, MAX_PATH> PathNameUTF8;
138  if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8))
139    return "";
140
141  return std::string(PathNameUTF8.data());
142}
143
144UniqueID 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);
149
150  return UniqueID(VolumeSerialNumber, FileID);
151}
152
153TimeValue file_status::getLastModificationTime() const {
154  ULARGE_INTEGER UI;
155  UI.LowPart = LastWriteTimeLow;
156  UI.HighPart = LastWriteTimeHigh;
157
158  TimeValue Ret;
159  Ret.fromWin32Time(UI.QuadPart);
160  return Ret;
161}
162
163std::error_code current_path(SmallVectorImpl<char> &result) {
164  SmallVector<wchar_t, MAX_PATH> cur_path;
165  DWORD len = MAX_PATH;
166
167  do {
168    cur_path.reserve(len);
169    len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
170
171    // A zero return value indicates a failure other than insufficient space.
172    if (len == 0)
173      return mapWindowsError(::GetLastError());
174
175    // If there's insufficient space, the len returned is larger than the len
176    // given.
177  } while (len > cur_path.capacity());
178
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);
183}
184
185std::error_code create_directory(const Twine &path, bool IgnoreExisting,
186                                 perms Perms) {
187  SmallVector<wchar_t, 128> path_utf16;
188
189  if (std::error_code ec = widenPath(path, path_utf16))
190    return ec;
191
192  if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
193    DWORD LastError = ::GetLastError();
194    if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting)
195      return mapWindowsError(LastError);
196  }
197
198  return std::error_code();
199}
200
201// We can't use symbolic links for windows.
202std::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))
207    return ec;
208  if (std::error_code ec = widenPath(to, wide_to))
209    return ec;
210
211  if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
212    return mapWindowsError(::GetLastError());
213
214  return std::error_code();
215}
216
217std::error_code remove(const Twine &path, bool IgnoreNonExisting) {
218  SmallVector<wchar_t, 128> path_utf16;
219
220  file_status ST;
221  if (std::error_code EC = status(path, ST)) {
222    if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
223      return EC;
224    return std::error_code();
225  }
226
227  if (std::error_code ec = widenPath(path, path_utf16))
228    return ec;
229
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)
234        return EC;
235    }
236    return std::error_code();
237  }
238  if (!::DeleteFileW(c_str(path_utf16))) {
239    std::error_code EC = mapWindowsError(::GetLastError());
240    if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting)
241      return EC;
242  }
243  return std::error_code();
244}
245
246std::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))
251    return ec;
252  if (std::error_code ec = widenPath(to, wide_to))
253    return ec;
254
255  std::error_code ec = std::error_code();
256
257  // Retry while we see ERROR_ACCESS_DENIED.
258  // System scanners (eg. indexer) might open the source file when it is written
259  // and closed.
260
261  for (int i = 0; i < 2000; i++) {
262    // Try ReplaceFile first, as it is able to associate a new data stream with
263    // the destination even if the destination file is currently open.
264    if (::ReplaceFileW(wide_to.begin(), wide_from.begin(), NULL, 0, NULL, NULL))
265      return std::error_code();
266
267    // We get ERROR_FILE_NOT_FOUND if the destination file is missing.
268    // MoveFileEx can handle this case.
269    DWORD ReplaceError = ::GetLastError();
270    ec = mapWindowsError(ReplaceError);
271    if (ReplaceError != ERROR_ACCESS_DENIED &&
272        ReplaceError != ERROR_FILE_NOT_FOUND &&
273        ReplaceError != ERROR_SHARING_VIOLATION)
274      break;
275
276    if (::MoveFileExW(wide_from.begin(), wide_to.begin(),
277                      MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
278      return std::error_code();
279
280    DWORD MoveError = ::GetLastError();
281    ec = mapWindowsError(MoveError);
282    if (MoveError != ERROR_ACCESS_DENIED) break;
283
284    ::Sleep(1);
285  }
286
287  return ec;
288}
289
290std::error_code resize_file(int FD, uint64_t Size) {
291#ifdef HAVE__CHSIZE_S
292  errno_t error = ::_chsize_s(FD, Size);
293#else
294  errno_t error = ::_chsize(FD, Size);
295#endif
296  return std::error_code(error, std::generic_category());
297}
298
299std::error_code access(const Twine &Path, AccessMode Mode) {
300  SmallVector<wchar_t, 128> PathUtf16;
301
302  if (std::error_code EC = widenPath(Path, PathUtf16))
303    return EC;
304
305  DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin());
306
307  if (Attributes == INVALID_FILE_ATTRIBUTES) {
308    // See if the file didn't actually exist.
309    DWORD LastError = ::GetLastError();
310    if (LastError != ERROR_FILE_NOT_FOUND &&
311        LastError != ERROR_PATH_NOT_FOUND)
312      return mapWindowsError(LastError);
313    return errc::no_such_file_or_directory;
314  }
315
316  if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY))
317    return errc::permission_denied;
318
319  return std::error_code();
320}
321
322bool can_execute(const Twine &Path) {
323  return !access(Path, AccessMode::Execute) ||
324         !access(Path + ".exe", AccessMode::Execute);
325}
326
327bool equivalent(file_status A, file_status B) {
328  assert(status_known(A) && status_known(B));
329  return A.FileIndexHigh      == B.FileIndexHigh &&
330         A.FileIndexLow       == B.FileIndexLow &&
331         A.FileSizeHigh       == B.FileSizeHigh &&
332         A.FileSizeLow        == B.FileSizeLow &&
333         A.LastWriteTimeHigh  == B.LastWriteTimeHigh &&
334         A.LastWriteTimeLow   == B.LastWriteTimeLow &&
335         A.VolumeSerialNumber == B.VolumeSerialNumber;
336}
337
338std::error_code equivalent(const Twine &A, const Twine &B, bool &result) {
339  file_status fsA, fsB;
340  if (std::error_code ec = status(A, fsA))
341    return ec;
342  if (std::error_code ec = status(B, fsB))
343    return ec;
344  result = equivalent(fsA, fsB);
345  return std::error_code();
346}
347
348static bool isReservedName(StringRef path) {
349  // This list of reserved names comes from MSDN, at:
350  // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
351  static const char *const sReservedNames[] = { "nul", "con", "prn", "aux",
352                                                "com1", "com2", "com3", "com4",
353                                                "com5", "com6", "com7", "com8",
354                                                "com9", "lpt1", "lpt2", "lpt3",
355                                                "lpt4", "lpt5", "lpt6", "lpt7",
356                                                "lpt8", "lpt9" };
357
358  // First, check to see if this is a device namespace, which always
359  // starts with \\.\, since device namespaces are not legal file paths.
360  if (path.startswith("\\\\.\\"))
361    return true;
362
363  // Then compare against the list of ancient reserved names
364  for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) {
365    if (path.equals_lower(sReservedNames[i]))
366      return true;
367  }
368
369  // The path isn't what we consider reserved.
370  return false;
371}
372
373static std::error_code getStatus(HANDLE FileHandle, file_status &Result) {
374  if (FileHandle == INVALID_HANDLE_VALUE)
375    goto handle_status_error;
376
377  switch (::GetFileType(FileHandle)) {
378  default:
379    llvm_unreachable("Don't know anything about this file type");
380  case FILE_TYPE_UNKNOWN: {
381    DWORD Err = ::GetLastError();
382    if (Err != NO_ERROR)
383      return mapWindowsError(Err);
384    Result = file_status(file_type::type_unknown);
385    return std::error_code();
386  }
387  case FILE_TYPE_DISK:
388    break;
389  case FILE_TYPE_CHAR:
390    Result = file_status(file_type::character_file);
391    return std::error_code();
392  case FILE_TYPE_PIPE:
393    Result = file_status(file_type::fifo_file);
394    return std::error_code();
395  }
396
397  BY_HANDLE_FILE_INFORMATION Info;
398  if (!::GetFileInformationByHandle(FileHandle, &Info))
399    goto handle_status_error;
400
401  {
402    file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
403                         ? file_type::directory_file
404                         : file_type::regular_file;
405    Result =
406        file_status(Type, Info.ftLastWriteTime.dwHighDateTime,
407                    Info.ftLastWriteTime.dwLowDateTime,
408                    Info.dwVolumeSerialNumber, Info.nFileSizeHigh,
409                    Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow);
410    return std::error_code();
411  }
412
413handle_status_error:
414  DWORD LastError = ::GetLastError();
415  if (LastError == ERROR_FILE_NOT_FOUND ||
416      LastError == ERROR_PATH_NOT_FOUND)
417    Result = file_status(file_type::file_not_found);
418  else if (LastError == ERROR_SHARING_VIOLATION)
419    Result = file_status(file_type::type_unknown);
420  else
421    Result = file_status(file_type::status_error);
422  return mapWindowsError(LastError);
423}
424
425std::error_code status(const Twine &path, file_status &result) {
426  SmallString<128> path_storage;
427  SmallVector<wchar_t, 128> path_utf16;
428
429  StringRef path8 = path.toStringRef(path_storage);
430  if (isReservedName(path8)) {
431    result = file_status(file_type::character_file);
432    return std::error_code();
433  }
434
435  if (std::error_code ec = widenPath(path8, path_utf16))
436    return ec;
437
438  DWORD attr = ::GetFileAttributesW(path_utf16.begin());
439  if (attr == INVALID_FILE_ATTRIBUTES)
440    return getStatus(INVALID_HANDLE_VALUE, result);
441
442  // Handle reparse points.
443  if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
444    ScopedFileHandle h(
445      ::CreateFileW(path_utf16.begin(),
446                    0, // Attributes only.
447                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
448                    NULL,
449                    OPEN_EXISTING,
450                    FILE_FLAG_BACKUP_SEMANTICS,
451                    0));
452    if (!h)
453      return getStatus(INVALID_HANDLE_VALUE, result);
454  }
455
456  ScopedFileHandle h(
457      ::CreateFileW(path_utf16.begin(), 0, // Attributes only.
458                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
459                    NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0));
460    if (!h)
461      return getStatus(INVALID_HANDLE_VALUE, result);
462
463    return getStatus(h, result);
464}
465
466std::error_code status(int FD, file_status &Result) {
467  HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
468  return getStatus(FileHandle, Result);
469}
470
471std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) {
472  ULARGE_INTEGER UI;
473  UI.QuadPart = Time.toWin32Time();
474  FILETIME FT;
475  FT.dwLowDateTime = UI.LowPart;
476  FT.dwHighDateTime = UI.HighPart;
477  HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
478  if (!SetFileTime(FileHandle, NULL, &FT, &FT))
479    return mapWindowsError(::GetLastError());
480  return std::error_code();
481}
482
483std::error_code mapped_file_region::init(int FD, uint64_t Offset,
484                                         mapmode Mode) {
485  // Make sure that the requested size fits within SIZE_T.
486  if (Size > std::numeric_limits<SIZE_T>::max())
487    return make_error_code(errc::invalid_argument);
488
489  HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD));
490  if (FileHandle == INVALID_HANDLE_VALUE)
491    return make_error_code(errc::bad_file_descriptor);
492
493  DWORD flprotect;
494  switch (Mode) {
495  case readonly:  flprotect = PAGE_READONLY; break;
496  case readwrite: flprotect = PAGE_READWRITE; break;
497  case priv:      flprotect = PAGE_WRITECOPY; break;
498  }
499
500  HANDLE FileMappingHandle =
501      ::CreateFileMappingW(FileHandle, 0, flprotect,
502                           (Offset + Size) >> 32,
503                           (Offset + Size) & 0xffffffff,
504                           0);
505  if (FileMappingHandle == NULL) {
506    std::error_code ec = mapWindowsError(GetLastError());
507    return ec;
508  }
509
510  DWORD dwDesiredAccess;
511  switch (Mode) {
512  case readonly:  dwDesiredAccess = FILE_MAP_READ; break;
513  case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break;
514  case priv:      dwDesiredAccess = FILE_MAP_COPY; break;
515  }
516  Mapping = ::MapViewOfFile(FileMappingHandle,
517                            dwDesiredAccess,
518                            Offset >> 32,
519                            Offset & 0xffffffff,
520                            Size);
521  if (Mapping == NULL) {
522    std::error_code ec = mapWindowsError(GetLastError());
523    ::CloseHandle(FileMappingHandle);
524    return ec;
525  }
526
527  if (Size == 0) {
528    MEMORY_BASIC_INFORMATION mbi;
529    SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi));
530    if (Result == 0) {
531      std::error_code ec = mapWindowsError(GetLastError());
532      ::UnmapViewOfFile(Mapping);
533      ::CloseHandle(FileMappingHandle);
534      return ec;
535    }
536    Size = mbi.RegionSize;
537  }
538
539  // Close all the handles except for the view. It will keep the other handles
540  // alive.
541  ::CloseHandle(FileMappingHandle);
542  return std::error_code();
543}
544
545mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length,
546                                       uint64_t offset, std::error_code &ec)
547    : Size(length), Mapping() {
548  ec = init(fd, offset, mode);
549  if (ec)
550    Mapping = 0;
551}
552
553mapped_file_region::~mapped_file_region() {
554  if (Mapping)
555    ::UnmapViewOfFile(Mapping);
556}
557
558uint64_t mapped_file_region::size() const {
559  assert(Mapping && "Mapping failed but used anyway!");
560  return Size;
561}
562
563char *mapped_file_region::data() const {
564  assert(Mapping && "Mapping failed but used anyway!");
565  return reinterpret_cast<char*>(Mapping);
566}
567
568const char *mapped_file_region::const_data() const {
569  assert(Mapping && "Mapping failed but used anyway!");
570  return reinterpret_cast<const char*>(Mapping);
571}
572
573int mapped_file_region::alignment() {
574  SYSTEM_INFO SysInfo;
575  ::GetSystemInfo(&SysInfo);
576  return SysInfo.dwAllocationGranularity;
577}
578
579std::error_code detail::directory_iterator_construct(detail::DirIterState &it,
580                                                StringRef path){
581  SmallVector<wchar_t, 128> path_utf16;
582
583  if (std::error_code ec = widenPath(path, path_utf16))
584    return ec;
585
586  // Convert path to the format that Windows is happy with.
587  if (path_utf16.size() > 0 &&
588      !is_separator(path_utf16[path.size() - 1]) &&
589      path_utf16[path.size() - 1] != L':') {
590    path_utf16.push_back(L'\\');
591    path_utf16.push_back(L'*');
592  } else {
593    path_utf16.push_back(L'*');
594  }
595
596  //  Get the first directory entry.
597  WIN32_FIND_DATAW FirstFind;
598  ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
599  if (!FindHandle)
600    return mapWindowsError(::GetLastError());
601
602  size_t FilenameLen = ::wcslen(FirstFind.cFileName);
603  while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
604         (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
605                              FirstFind.cFileName[1] == L'.'))
606    if (!::FindNextFileW(FindHandle, &FirstFind)) {
607      DWORD LastError = ::GetLastError();
608      // Check for end.
609      if (LastError == ERROR_NO_MORE_FILES)
610        return detail::directory_iterator_destruct(it);
611      return mapWindowsError(LastError);
612    } else
613      FilenameLen = ::wcslen(FirstFind.cFileName);
614
615  // Construct the current directory entry.
616  SmallString<128> directory_entry_name_utf8;
617  if (std::error_code ec =
618          UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName),
619                      directory_entry_name_utf8))
620    return ec;
621
622  it.IterationHandle = intptr_t(FindHandle.take());
623  SmallString<128> directory_entry_path(path);
624  path::append(directory_entry_path, directory_entry_name_utf8);
625  it.CurrentEntry = directory_entry(directory_entry_path);
626
627  return std::error_code();
628}
629
630std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
631  if (it.IterationHandle != 0)
632    // Closes the handle if it's valid.
633    ScopedFindHandle close(HANDLE(it.IterationHandle));
634  it.IterationHandle = 0;
635  it.CurrentEntry = directory_entry();
636  return std::error_code();
637}
638
639std::error_code detail::directory_iterator_increment(detail::DirIterState &it) {
640  WIN32_FIND_DATAW FindData;
641  if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
642    DWORD LastError = ::GetLastError();
643    // Check for end.
644    if (LastError == ERROR_NO_MORE_FILES)
645      return detail::directory_iterator_destruct(it);
646    return mapWindowsError(LastError);
647  }
648
649  size_t FilenameLen = ::wcslen(FindData.cFileName);
650  if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
651      (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
652                           FindData.cFileName[1] == L'.'))
653    return directory_iterator_increment(it);
654
655  SmallString<128> directory_entry_path_utf8;
656  if (std::error_code ec =
657          UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName),
658                      directory_entry_path_utf8))
659    return ec;
660
661  it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
662  return std::error_code();
663}
664
665std::error_code openFileForRead(const Twine &Name, int &ResultFD) {
666  SmallVector<wchar_t, 128> PathUTF16;
667
668  if (std::error_code EC = widenPath(Name, PathUTF16))
669    return EC;
670
671  HANDLE H =
672      ::CreateFileW(PathUTF16.begin(), GENERIC_READ,
673                    FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
674                    NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
675  if (H == INVALID_HANDLE_VALUE) {
676    DWORD LastError = ::GetLastError();
677    std::error_code EC = mapWindowsError(LastError);
678    // Provide a better error message when trying to open directories.
679    // This only runs if we failed to open the file, so there is probably
680    // no performances issues.
681    if (LastError != ERROR_ACCESS_DENIED)
682      return EC;
683    if (is_directory(Name))
684      return make_error_code(errc::is_a_directory);
685    return EC;
686  }
687
688  int FD = ::_open_osfhandle(intptr_t(H), 0);
689  if (FD == -1) {
690    ::CloseHandle(H);
691    return mapWindowsError(ERROR_INVALID_HANDLE);
692  }
693
694  ResultFD = FD;
695  return std::error_code();
696}
697
698std::error_code openFileForWrite(const Twine &Name, int &ResultFD,
699                            sys::fs::OpenFlags Flags, unsigned Mode) {
700  // Verify that we don't have both "append" and "excl".
701  assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) &&
702         "Cannot specify both 'excl' and 'append' file creation flags!");
703
704  SmallVector<wchar_t, 128> PathUTF16;
705
706  if (std::error_code EC = widenPath(Name, PathUTF16))
707    return EC;
708
709  DWORD CreationDisposition;
710  if (Flags & F_Excl)
711    CreationDisposition = CREATE_NEW;
712  else if (Flags & F_Append)
713    CreationDisposition = OPEN_ALWAYS;
714  else
715    CreationDisposition = CREATE_ALWAYS;
716
717  DWORD Access = GENERIC_WRITE;
718  if (Flags & F_RW)
719    Access |= GENERIC_READ;
720
721  HANDLE H = ::CreateFileW(PathUTF16.begin(), Access,
722                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
723                           CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL);
724
725  if (H == INVALID_HANDLE_VALUE) {
726    DWORD LastError = ::GetLastError();
727    std::error_code EC = mapWindowsError(LastError);
728    // Provide a better error message when trying to open directories.
729    // This only runs if we failed to open the file, so there is probably
730    // no performances issues.
731    if (LastError != ERROR_ACCESS_DENIED)
732      return EC;
733    if (is_directory(Name))
734      return make_error_code(errc::is_a_directory);
735    return EC;
736  }
737
738  int OpenFlags = 0;
739  if (Flags & F_Append)
740    OpenFlags |= _O_APPEND;
741
742  if (Flags & F_Text)
743    OpenFlags |= _O_TEXT;
744
745  int FD = ::_open_osfhandle(intptr_t(H), OpenFlags);
746  if (FD == -1) {
747    ::CloseHandle(H);
748    return mapWindowsError(ERROR_INVALID_HANDLE);
749  }
750
751  ResultFD = FD;
752  return std::error_code();
753}
754} // end namespace fs
755
756namespace path {
757static bool getKnownFolderPath(KNOWNFOLDERID folderId,
758                               SmallVectorImpl<char> &result) {
759#if 0
760  wchar_t *path = nullptr;
761  if (::SHGetKnownFolderPath(folderId, KF_FLAG_CREATE, nullptr, &path) != S_OK)
762    return false;
763
764  bool ok = !UTF16ToUTF8(path, ::wcslen(path), result);
765  ::CoTaskMemFree(path);
766  return ok;
767#else
768  // ANDROID needs updated mingw to build this.
769  // BUG: http://b/26523949
770  return false;
771#endif
772}
773
774bool getUserCacheDir(SmallVectorImpl<char> &Result) {
775#if 0
776  return getKnownFolderPath(FOLDERID_LocalAppData, Result);
777#else
778  // ANDROID needs updated mingw to build this.
779  // BUG: http://b/26523949
780  return false;
781#endif
782}
783
784bool home_directory(SmallVectorImpl<char> &result) {
785  return getKnownFolderPath(FOLDERID_Profile, result);
786}
787
788static bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) {
789  SmallVector<wchar_t, 1024> Buf;
790  size_t Size = 1024;
791  do {
792    Buf.reserve(Size);
793    Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity());
794    if (Size == 0)
795      return false;
796
797    // Try again with larger buffer.
798  } while (Size > Buf.capacity());
799  Buf.set_size(Size);
800
801  return !windows::UTF16ToUTF8(Buf.data(), Size, Res);
802}
803
804static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) {
805  const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"};
806  for (auto *Env : EnvironmentVariables) {
807    if (getTempDirEnvVar(Env, Res))
808      return true;
809  }
810  return false;
811}
812
813void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) {
814  (void)ErasedOnReboot;
815  Result.clear();
816
817  // Check whether the temporary directory is specified by an environment var.
818  // This matches GetTempPath logic to some degree. GetTempPath is not used
819  // directly as it cannot handle evn var longer than 130 chars on Windows 7
820  // (fixed on Windows 8).
821  if (getTempDirEnvVar(Result)) {
822    assert(!Result.empty() && "Unexpected empty path");
823    native(Result); // Some Unix-like shells use Unix path separator in $TMP.
824    fs::make_absolute(Result); // Make it absolute if not already.
825    return;
826  }
827
828  // Fall back to a system default.
829  const char *DefaultResult = "C:\\Temp";
830  Result.append(DefaultResult, DefaultResult + strlen(DefaultResult));
831}
832} // end namespace path
833
834namespace windows {
835std::error_code UTF8ToUTF16(llvm::StringRef utf8,
836                            llvm::SmallVectorImpl<wchar_t> &utf16) {
837  if (!utf8.empty()) {
838    int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
839                                    utf8.size(), utf16.begin(), 0);
840
841    if (len == 0)
842      return mapWindowsError(::GetLastError());
843
844    utf16.reserve(len + 1);
845    utf16.set_size(len);
846
847    len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(),
848                                utf8.size(), utf16.begin(), utf16.size());
849
850    if (len == 0)
851      return mapWindowsError(::GetLastError());
852  }
853
854  // Make utf16 null terminated.
855  utf16.push_back(0);
856  utf16.pop_back();
857
858  return std::error_code();
859}
860
861static
862std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16,
863                                size_t utf16_len,
864                                llvm::SmallVectorImpl<char> &utf8) {
865  if (utf16_len) {
866    // Get length.
867    int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(),
868                                    0, NULL, NULL);
869
870    if (len == 0)
871      return mapWindowsError(::GetLastError());
872
873    utf8.reserve(len);
874    utf8.set_size(len);
875
876    // Now do the actual conversion.
877    len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(),
878                                utf8.size(), NULL, NULL);
879
880    if (len == 0)
881      return mapWindowsError(::GetLastError());
882  }
883
884  // Make utf8 null terminated.
885  utf8.push_back(0);
886  utf8.pop_back();
887
888  return std::error_code();
889}
890
891std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
892                            llvm::SmallVectorImpl<char> &utf8) {
893  return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8);
894}
895
896std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len,
897                             llvm::SmallVectorImpl<char> &utf8) {
898  return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8);
899}
900} // end namespace windows
901} // end namespace sys
902} // end namespace llvm
903