PathV2.inc revision 1dd2ee7bf4d848e368829cb01033f297afb674ab 
1//===- llvm/Support/Windows/PathV2.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 PathV2 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 "Windows.h"
20#include <fcntl.h>
21#include <io.h>
22#include <sys/stat.h>
23#include <sys/types.h>
24
25// MinGW doesn't define this.
26#ifndef _ERRNO_T_DEFINED
27#define _ERRNO_T_DEFINED
28typedef int errno_t;
29#endif
30
31using namespace llvm;
32
33namespace {
34  typedef BOOLEAN (WINAPI *PtrCreateSymbolicLinkW)(
35    /*__in*/ LPCWSTR lpSymlinkFileName,
36    /*__in*/ LPCWSTR lpTargetFileName,
37    /*__in*/ DWORD dwFlags);
38
39  PtrCreateSymbolicLinkW create_symbolic_link_api = PtrCreateSymbolicLinkW(
40    ::GetProcAddress(::GetModuleHandleA("kernel32.dll"),
41                     "CreateSymbolicLinkW"));
42
43  error_code UTF8ToUTF16(StringRef utf8, SmallVectorImpl<wchar_t> &utf16) {
44    int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
45                                    utf8.begin(), utf8.size(),
46                                    utf16.begin(), 0);
47
48    if (len == 0)
49      return windows_error(::GetLastError());
50
51    utf16.reserve(len + 1);
52    utf16.set_size(len);
53
54    len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS,
55                                    utf8.begin(), utf8.size(),
56                                    utf16.begin(), utf16.size());
57
58    if (len == 0)
59      return windows_error(::GetLastError());
60
61    // Make utf16 null terminated.
62    utf16.push_back(0);
63    utf16.pop_back();
64
65    return success;
66  }
67
68  error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len,
69                               SmallVectorImpl<char> &utf8) {
70    // Get length.
71    int len = ::WideCharToMultiByte(CP_UTF8, 0,
72                                    utf16, utf16_len,
73                                    utf8.begin(), 0,
74                                    NULL, NULL);
75
76    if (len == 0)
77      return windows_error(::GetLastError());
78
79    utf8.reserve(len);
80    utf8.set_size(len);
81
82    // Now do the actual conversion.
83    len = ::WideCharToMultiByte(CP_UTF8, 0,
84                                utf16, utf16_len,
85                                utf8.data(), utf8.size(),
86                                NULL, NULL);
87
88    if (len == 0)
89      return windows_error(::GetLastError());
90
91    // Make utf8 null terminated.
92    utf8.push_back(0);
93    utf8.pop_back();
94
95    return success;
96  }
97
98  error_code TempDir(SmallVectorImpl<wchar_t> &result) {
99  retry_temp_dir:
100    DWORD len = ::GetTempPathW(result.capacity(), result.begin());
101
102    if (len == 0)
103      return windows_error(::GetLastError());
104
105    if (len > result.capacity()) {
106      result.reserve(len);
107      goto retry_temp_dir;
108    }
109
110    result.set_size(len);
111    return success;
112  }
113
114  bool is_separator(const wchar_t value) {
115    switch (value) {
116    case L'\\':
117    case L'/':
118      return true;
119    default:
120      return false;
121    }
122  }
123}
124
125namespace llvm {
126namespace sys  {
127namespace fs {
128
129error_code current_path(SmallVectorImpl<char> &result) {
130  SmallVector<wchar_t, 128> cur_path;
131  cur_path.reserve(128);
132retry_cur_dir:
133  DWORD len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data());
134
135  // A zero return value indicates a failure other than insufficient space.
136  if (len == 0)
137    return windows_error(::GetLastError());
138
139  // If there's insufficient space, the len returned is larger than the len
140  // given.
141  if (len > cur_path.capacity()) {
142    cur_path.reserve(len);
143    goto retry_cur_dir;
144  }
145
146  cur_path.set_size(len);
147  // cur_path now holds the current directory in utf-16. Convert to utf-8.
148
149  // Find out how much space we need. Sadly, this function doesn't return the
150  // size needed unless you tell it the result size is 0, which means you
151  // _always_ have to call it twice.
152  len = ::WideCharToMultiByte(CP_UTF8, 0,
153                              cur_path.data(), cur_path.size(),
154                              result.data(), 0,
155                              NULL, NULL);
156
157  if (len == 0)
158    return make_error_code(windows_error(::GetLastError()));
159
160  result.reserve(len);
161  result.set_size(len);
162  // Now do the actual conversion.
163  len = ::WideCharToMultiByte(CP_UTF8, 0,
164                              cur_path.data(), cur_path.size(),
165                              result.data(), result.size(),
166                              NULL, NULL);
167  if (len == 0)
168    return windows_error(::GetLastError());
169
170  return success;
171}
172
173error_code copy_file(const Twine &from, const Twine &to, copy_option copt) {
174  // Get arguments.
175  SmallString<128> from_storage;
176  SmallString<128> to_storage;
177  StringRef f = from.toStringRef(from_storage);
178  StringRef t = to.toStringRef(to_storage);
179
180  // Convert to utf-16.
181  SmallVector<wchar_t, 128> wide_from;
182  SmallVector<wchar_t, 128> wide_to;
183  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
184  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
185
186  // Copy the file.
187  BOOL res = ::CopyFileW(wide_from.begin(), wide_to.begin(),
188                         copt != copy_option::overwrite_if_exists);
189
190  if (res == 0)
191    return windows_error(::GetLastError());
192
193  return success;
194}
195
196error_code create_directory(const Twine &path, bool &existed) {
197  SmallString<128> path_storage;
198  SmallVector<wchar_t, 128> path_utf16;
199
200  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
201                                  path_utf16))
202    return ec;
203
204  if (!::CreateDirectoryW(path_utf16.begin(), NULL)) {
205    error_code ec = windows_error(::GetLastError());
206    if (ec == windows_error::already_exists)
207      existed = true;
208    else
209      return ec;
210  } else
211    existed = false;
212
213  return success;
214}
215
216error_code create_hard_link(const Twine &to, const Twine &from) {
217  // Get arguments.
218  SmallString<128> from_storage;
219  SmallString<128> to_storage;
220  StringRef f = from.toStringRef(from_storage);
221  StringRef t = to.toStringRef(to_storage);
222
223  // Convert to utf-16.
224  SmallVector<wchar_t, 128> wide_from;
225  SmallVector<wchar_t, 128> wide_to;
226  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
227  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
228
229  if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL))
230    return windows_error(::GetLastError());
231
232  return success;
233}
234
235error_code create_symlink(const Twine &to, const Twine &from) {
236  // Only do it if the function is available at runtime.
237  if (!create_symbolic_link_api)
238    return make_error_code(errc::function_not_supported);
239
240  // Get arguments.
241  SmallString<128> from_storage;
242  SmallString<128> to_storage;
243  StringRef f = from.toStringRef(from_storage);
244  StringRef t = to.toStringRef(to_storage);
245
246  // Convert to utf-16.
247  SmallVector<wchar_t, 128> wide_from;
248  SmallVector<wchar_t, 128> wide_to;
249  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
250  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
251
252  if (!create_symbolic_link_api(wide_from.begin(), wide_to.begin(), 0))
253    return windows_error(::GetLastError());
254
255  return success;
256}
257
258error_code remove(const Twine &path, bool &existed) {
259  SmallString<128> path_storage;
260  SmallVector<wchar_t, 128> path_utf16;
261
262  file_status st;
263  if (error_code ec = status(path, st))
264    return ec;
265
266  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
267                                  path_utf16))
268    return ec;
269
270  if (st.type() == file_type::directory_file) {
271    if (!::RemoveDirectoryW(c_str(path_utf16))) {
272      error_code ec = windows_error(::GetLastError());
273      if (ec != windows_error::file_not_found)
274        return ec;
275      existed = false;
276    } else
277      existed = true;
278  } else {
279    if (!::DeleteFileW(c_str(path_utf16))) {
280      error_code ec = windows_error(::GetLastError());
281      if (ec != windows_error::file_not_found)
282        return ec;
283      existed = false;
284    } else
285      existed = true;
286  }
287
288  return success;
289}
290
291error_code rename(const Twine &from, const Twine &to) {
292  // Get arguments.
293  SmallString<128> from_storage;
294  SmallString<128> to_storage;
295  StringRef f = from.toStringRef(from_storage);
296  StringRef t = to.toStringRef(to_storage);
297
298  // Convert to utf-16.
299  SmallVector<wchar_t, 128> wide_from;
300  SmallVector<wchar_t, 128> wide_to;
301  if (error_code ec = UTF8ToUTF16(f, wide_from)) return ec;
302  if (error_code ec = UTF8ToUTF16(t, wide_to)) return ec;
303
304  if (!::MoveFileExW(wide_from.begin(), wide_to.begin(),
305                     MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING))
306    return windows_error(::GetLastError());
307
308  return success;
309}
310
311error_code resize_file(const Twine &path, uint64_t size) {
312  SmallString<128> path_storage;
313  SmallVector<wchar_t, 128> path_utf16;
314
315  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
316                                  path_utf16))
317    return ec;
318
319  int fd = ::_wopen(path_utf16.begin(), O_BINARY, S_IREAD | S_IWRITE);
320  if (fd == -1)
321    return error_code(errno, generic_category());
322#ifdef HAVE__CHSIZE_S
323  errno_t error = ::_chsize_s(fd, size);
324#else
325  errno_t error = ::_chsize(fd, size);
326#endif
327  ::close(fd);
328  return error_code(error, generic_category());
329}
330
331error_code exists(const Twine &path, bool &result) {
332  SmallString<128> path_storage;
333  SmallVector<wchar_t, 128> path_utf16;
334
335  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
336                                  path_utf16))
337    return ec;
338
339  DWORD attributes = ::GetFileAttributesW(path_utf16.begin());
340
341  if (attributes == INVALID_FILE_ATTRIBUTES) {
342    // See if the file didn't actually exist.
343    error_code ec = make_error_code(windows_error(::GetLastError()));
344    if (ec != windows_error::file_not_found &&
345        ec != windows_error::path_not_found)
346      return ec;
347    result = false;
348  } else
349    result = true;
350  return success;
351}
352
353error_code equivalent(const Twine &A, const Twine &B, bool &result) {
354  // Get arguments.
355  SmallString<128> a_storage;
356  SmallString<128> b_storage;
357  StringRef a = A.toStringRef(a_storage);
358  StringRef b = B.toStringRef(b_storage);
359
360  // Convert to utf-16.
361  SmallVector<wchar_t, 128> wide_a;
362  SmallVector<wchar_t, 128> wide_b;
363  if (error_code ec = UTF8ToUTF16(a, wide_a)) return ec;
364  if (error_code ec = UTF8ToUTF16(b, wide_b)) return ec;
365
366  ScopedFileHandle HandleB(
367    ::CreateFileW(wide_b.begin(),
368                  0,
369                  FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
370                  0,
371                  OPEN_EXISTING,
372                  FILE_FLAG_BACKUP_SEMANTICS,
373                  0));
374
375  ScopedFileHandle HandleA(
376    ::CreateFileW(wide_a.begin(),
377                  0,
378                  FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
379                  0,
380                  OPEN_EXISTING,
381                  FILE_FLAG_BACKUP_SEMANTICS,
382                  0));
383
384  // If both handles are invalid, it's an error.
385  if (!HandleA && !HandleB)
386    return windows_error(::GetLastError());
387
388  // If only one is invalid, it's false.
389  if (!HandleA || !HandleB) {
390    result = false;
391    return success;
392  }
393
394  // Get file information.
395  BY_HANDLE_FILE_INFORMATION InfoA, InfoB;
396  if (!::GetFileInformationByHandle(HandleA, &InfoA))
397    return windows_error(::GetLastError());
398  if (!::GetFileInformationByHandle(HandleB, &InfoB))
399    return windows_error(::GetLastError());
400
401  // See if it's all the same.
402  result =
403    InfoA.dwVolumeSerialNumber           == InfoB.dwVolumeSerialNumber &&
404    InfoA.nFileIndexHigh                 == InfoB.nFileIndexHigh &&
405    InfoA.nFileIndexLow                  == InfoB.nFileIndexLow &&
406    InfoA.nFileSizeHigh                  == InfoB.nFileSizeHigh &&
407    InfoA.nFileSizeLow                   == InfoB.nFileSizeLow &&
408    InfoA.ftLastWriteTime.dwLowDateTime  ==
409      InfoB.ftLastWriteTime.dwLowDateTime &&
410    InfoA.ftLastWriteTime.dwHighDateTime ==
411      InfoB.ftLastWriteTime.dwHighDateTime;
412
413  return success;
414}
415
416error_code file_size(const Twine &path, uint64_t &result) {
417  SmallString<128> path_storage;
418  SmallVector<wchar_t, 128> path_utf16;
419
420  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
421                                  path_utf16))
422    return ec;
423
424  WIN32_FILE_ATTRIBUTE_DATA FileData;
425  if (!::GetFileAttributesExW(path_utf16.begin(),
426                              ::GetFileExInfoStandard,
427                              &FileData))
428    return windows_error(::GetLastError());
429
430  result =
431    (uint64_t(FileData.nFileSizeHigh) << (sizeof(FileData.nFileSizeLow) * 8))
432    + FileData.nFileSizeLow;
433
434  return success;
435}
436
437static bool isReservedName(StringRef path) {
438  // This list of reserved names comes from MSDN, at:
439  // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx
440  static const char *sReservedNames[] = { "nul", "con", "prn", "aux",
441                              "com1", "com2", "com3", "com4", "com5", "com6",
442                              "com7", "com8", "com9", "lpt1", "lpt2", "lpt3",
443                              "lpt4", "lpt5", "lpt6", "lpt7", "lpt8", "lpt9" };
444
445  // First, check to see if this is a device namespace, which always
446  // starts with \\.\, since device namespaces are not legal file paths.
447  if (path.startswith("\\\\.\\"))
448    return true;
449
450  // Then compare against the list of ancient reserved names
451  for (size_t i = 0; i < sizeof(sReservedNames) / sizeof(const char *); ++i) {
452    if (path.equals_lower(sReservedNames[i]))
453      return true;
454  }
455
456  // The path isn't what we consider reserved.
457  return false;
458}
459
460error_code status(const Twine &path, file_status &result) {
461  SmallString<128> path_storage;
462  SmallVector<wchar_t, 128> path_utf16;
463
464  StringRef path8 = path.toStringRef(path_storage);
465  if (isReservedName(path8)) {
466    result = file_status(file_type::character_file);
467    return success;
468  }
469
470  if (error_code ec = UTF8ToUTF16(path8,
471                                  path_utf16))
472    return ec;
473
474  DWORD attr = ::GetFileAttributesW(path_utf16.begin());
475  if (attr == INVALID_FILE_ATTRIBUTES)
476    goto handle_status_error;
477
478  // Handle reparse points.
479  if (attr & FILE_ATTRIBUTE_REPARSE_POINT) {
480    ScopedFileHandle h(
481      ::CreateFileW(path_utf16.begin(),
482                    0, // Attributes only.
483                    FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
484                    NULL,
485                    OPEN_EXISTING,
486                    FILE_FLAG_BACKUP_SEMANTICS,
487                    0));
488    if (!h)
489      goto handle_status_error;
490  }
491
492  if (attr & FILE_ATTRIBUTE_DIRECTORY)
493    result = file_status(file_type::directory_file);
494  else
495    result = file_status(file_type::regular_file);
496
497  return success;
498
499handle_status_error:
500  error_code ec = windows_error(::GetLastError());
501  if (ec == windows_error::file_not_found ||
502      ec == windows_error::path_not_found)
503    result = file_status(file_type::file_not_found);
504  else if (ec == windows_error::sharing_violation)
505    result = file_status(file_type::type_unknown);
506  else {
507    result = file_status(file_type::status_error);
508    return ec;
509  }
510
511  return success;
512}
513
514error_code unique_file(const Twine &model, int &result_fd,
515                             SmallVectorImpl<char> &result_path,
516                             bool makeAbsolute) {
517  // Use result_path as temp storage.
518  result_path.set_size(0);
519  StringRef m = model.toStringRef(result_path);
520
521  SmallVector<wchar_t, 128> model_utf16;
522  if (error_code ec = UTF8ToUTF16(m, model_utf16)) return ec;
523
524  if (makeAbsolute) {
525    // Make model absolute by prepending a temp directory if it's not already.
526    bool absolute = path::is_absolute(m);
527
528    if (!absolute) {
529      SmallVector<wchar_t, 64> temp_dir;
530      if (error_code ec = TempDir(temp_dir)) return ec;
531      // Handle c: by removing it.
532      if (model_utf16.size() > 2 && model_utf16[1] == L':') {
533        model_utf16.erase(model_utf16.begin(), model_utf16.begin() + 2);
534      }
535      model_utf16.insert(model_utf16.begin(), temp_dir.begin(), temp_dir.end());
536    }
537  }
538
539  // Replace '%' with random chars. From here on, DO NOT modify model. It may be
540  // needed if the randomly chosen path already exists.
541  SmallVector<wchar_t, 128> random_path_utf16;
542
543  // Get a Crypto Provider for CryptGenRandom.
544  HCRYPTPROV HCPC;
545  if (!::CryptAcquireContextW(&HCPC,
546                              NULL,
547                              NULL,
548                              PROV_RSA_FULL,
549                              CRYPT_VERIFYCONTEXT))
550    return windows_error(::GetLastError());
551  ScopedCryptContext CryptoProvider(HCPC);
552
553retry_random_path:
554  random_path_utf16.set_size(0);
555  for (SmallVectorImpl<wchar_t>::const_iterator i = model_utf16.begin(),
556                                                e = model_utf16.end();
557                                                i != e; ++i) {
558    if (*i == L'%') {
559      BYTE val = 0;
560      if (!::CryptGenRandom(CryptoProvider, 1, &val))
561          return windows_error(::GetLastError());
562      random_path_utf16.push_back("0123456789abcdef"[val & 15]);
563    }
564    else
565      random_path_utf16.push_back(*i);
566  }
567  // Make random_path_utf16 null terminated.
568  random_path_utf16.push_back(0);
569  random_path_utf16.pop_back();
570
571  // Try to create + open the path.
572retry_create_file:
573  HANDLE TempFileHandle = ::CreateFileW(random_path_utf16.begin(),
574                                        GENERIC_READ | GENERIC_WRITE,
575                                        FILE_SHARE_READ,
576                                        NULL,
577                                        // Return ERROR_FILE_EXISTS if the file
578                                        // already exists.
579                                        CREATE_NEW,
580                                        FILE_ATTRIBUTE_TEMPORARY,
581                                        NULL);
582  if (TempFileHandle == INVALID_HANDLE_VALUE) {
583    // If the file existed, try again, otherwise, error.
584    error_code ec = windows_error(::GetLastError());
585    if (ec == windows_error::file_exists)
586      goto retry_random_path;
587    // Check for non-existing parent directories.
588    if (ec == windows_error::path_not_found) {
589      // Create the directories using result_path as temp storage.
590      if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
591                                      random_path_utf16.size(), result_path))
592        return ec;
593      StringRef p(result_path.begin(), result_path.size());
594      SmallString<64> dir_to_create;
595      for (path::const_iterator i = path::begin(p),
596                                e = --path::end(p); i != e; ++i) {
597        path::append(dir_to_create, *i);
598        bool Exists;
599        if (error_code ec = exists(Twine(dir_to_create), Exists)) return ec;
600        if (!Exists) {
601          // If c: doesn't exist, bail.
602          if (i->endswith(":"))
603            return ec;
604
605          SmallVector<wchar_t, 64> dir_to_create_utf16;
606          if (error_code ec = UTF8ToUTF16(dir_to_create, dir_to_create_utf16))
607            return ec;
608
609          // Create the directory.
610          if (!::CreateDirectoryW(dir_to_create_utf16.begin(), NULL))
611            return windows_error(::GetLastError());
612        }
613      }
614      goto retry_create_file;
615    }
616    return ec;
617  }
618
619  // Set result_path to the utf-8 representation of the path.
620  if (error_code ec = UTF16ToUTF8(random_path_utf16.begin(),
621                                  random_path_utf16.size(), result_path)) {
622    ::CloseHandle(TempFileHandle);
623    ::DeleteFileW(random_path_utf16.begin());
624    return ec;
625  }
626
627  // Convert the Windows API file handle into a C-runtime handle.
628  int fd = ::_open_osfhandle(intptr_t(TempFileHandle), 0);
629  if (fd == -1) {
630    ::CloseHandle(TempFileHandle);
631    ::DeleteFileW(random_path_utf16.begin());
632    // MSDN doesn't say anything about _open_osfhandle setting errno or
633    // GetLastError(), so just return invalid_handle.
634    return windows_error::invalid_handle;
635  }
636
637  result_fd = fd;
638  return success;
639}
640
641error_code get_magic(const Twine &path, uint32_t len,
642                     SmallVectorImpl<char> &result) {
643  SmallString<128> path_storage;
644  SmallVector<wchar_t, 128> path_utf16;
645  result.set_size(0);
646
647  // Convert path to UTF-16.
648  if (error_code ec = UTF8ToUTF16(path.toStringRef(path_storage),
649                                  path_utf16))
650    return ec;
651
652  // Open file.
653  HANDLE file = ::CreateFileW(c_str(path_utf16),
654                              GENERIC_READ,
655                              FILE_SHARE_READ,
656                              NULL,
657                              OPEN_EXISTING,
658                              FILE_ATTRIBUTE_READONLY,
659                              NULL);
660  if (file == INVALID_HANDLE_VALUE)
661    return windows_error(::GetLastError());
662
663  // Allocate buffer.
664  result.reserve(len);
665
666  // Get magic!
667  DWORD bytes_read = 0;
668  BOOL read_success = ::ReadFile(file, result.data(), len, &bytes_read, NULL);
669  error_code ec = windows_error(::GetLastError());
670  ::CloseHandle(file);
671  if (!read_success || (bytes_read != len)) {
672    // Set result size to the number of bytes read if it's valid.
673    if (bytes_read <= len)
674      result.set_size(bytes_read);
675    // ERROR_HANDLE_EOF is mapped to errc::value_too_large.
676    return ec;
677  }
678
679  result.set_size(len);
680  return success;
681}
682
683error_code detail::directory_iterator_construct(detail::DirIterState &it,
684                                                StringRef path){
685  SmallVector<wchar_t, 128> path_utf16;
686
687  if (error_code ec = UTF8ToUTF16(path,
688                                  path_utf16))
689    return ec;
690
691  // Convert path to the format that Windows is happy with.
692  if (path_utf16.size() > 0 &&
693      !is_separator(path_utf16[path.size() - 1]) &&
694      path_utf16[path.size() - 1] != L':') {
695    path_utf16.push_back(L'\\');
696    path_utf16.push_back(L'*');
697  } else {
698    path_utf16.push_back(L'*');
699  }
700
701  //  Get the first directory entry.
702  WIN32_FIND_DATAW FirstFind;
703  ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind));
704  if (!FindHandle)
705    return windows_error(::GetLastError());
706
707  size_t FilenameLen = ::wcslen(FirstFind.cFileName);
708  while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') ||
709         (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' &&
710                              FirstFind.cFileName[1] == L'.'))
711    if (!::FindNextFileW(FindHandle, &FirstFind)) {
712      error_code ec = windows_error(::GetLastError());
713      // Check for end.
714      if (ec == windows_error::no_more_files)
715        return detail::directory_iterator_destruct(it);
716      return ec;
717    } else
718      FilenameLen = ::wcslen(FirstFind.cFileName);
719
720  // Construct the current directory entry.
721  SmallString<128> directory_entry_name_utf8;
722  if (error_code ec = UTF16ToUTF8(FirstFind.cFileName,
723                                  ::wcslen(FirstFind.cFileName),
724                                  directory_entry_name_utf8))
725    return ec;
726
727  it.IterationHandle = intptr_t(FindHandle.take());
728  SmallString<128> directory_entry_path(path);
729  path::append(directory_entry_path, directory_entry_name_utf8.str());
730  it.CurrentEntry = directory_entry(directory_entry_path.str());
731
732  return success;
733}
734
735error_code detail::directory_iterator_destruct(detail::DirIterState &it) {
736  if (it.IterationHandle != 0)
737    // Closes the handle if it's valid.
738    ScopedFindHandle close(HANDLE(it.IterationHandle));
739  it.IterationHandle = 0;
740  it.CurrentEntry = directory_entry();
741  return success;
742}
743
744error_code detail::directory_iterator_increment(detail::DirIterState &it) {
745  WIN32_FIND_DATAW FindData;
746  if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) {
747    error_code ec = windows_error(::GetLastError());
748    // Check for end.
749    if (ec == windows_error::no_more_files)
750      return detail::directory_iterator_destruct(it);
751    return ec;
752  }
753
754  size_t FilenameLen = ::wcslen(FindData.cFileName);
755  if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') ||
756      (FilenameLen == 2 && FindData.cFileName[0] == L'.' &&
757                           FindData.cFileName[1] == L'.'))
758    return directory_iterator_increment(it);
759
760  SmallString<128> directory_entry_path_utf8;
761  if (error_code ec = UTF16ToUTF8(FindData.cFileName,
762                                  ::wcslen(FindData.cFileName),
763                                  directory_entry_path_utf8))
764    return ec;
765
766  it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8));
767  return success;
768}
769
770} // end namespace fs
771} // end namespace sys
772} // end namespace llvm
773