Path.inc revision 296417
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# pragma comment(lib, "ole32.lib") // This provides CoTaskMemFree 42#endif 43 44using namespace llvm; 45 46using llvm::sys::windows::UTF8ToUTF16; 47using llvm::sys::windows::UTF16ToUTF8; 48using llvm::sys::path::widenPath; 49 50static bool is_separator(const wchar_t value) { 51 switch (value) { 52 case L'\\': 53 case L'/': 54 return true; 55 default: 56 return false; 57 } 58} 59 60namespace llvm { 61namespace sys { 62namespace path { 63 64// Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the 65// path is longer than CreateDirectory can tolerate, make it absolute and 66// prefixed by '\\?\'. 67std::error_code widenPath(const Twine &Path8, 68 SmallVectorImpl<wchar_t> &Path16) { 69 const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename. 70 71 // Several operations would convert Path8 to SmallString; more efficient to 72 // do it once up front. 73 SmallString<128> Path8Str; 74 Path8.toVector(Path8Str); 75 76 // If we made this path absolute, how much longer would it get? 77 size_t CurPathLen; 78 if (llvm::sys::path::is_absolute(Twine(Path8Str))) 79 CurPathLen = 0; // No contribution from current_path needed. 80 else { 81 CurPathLen = ::GetCurrentDirectoryW(0, NULL); 82 if (CurPathLen == 0) 83 return mapWindowsError(::GetLastError()); 84 } 85 86 // Would the absolute path be longer than our limit? 87 if ((Path8Str.size() + CurPathLen) >= MaxDirLen && 88 !Path8Str.startswith("\\\\?\\")) { 89 SmallString<2*MAX_PATH> FullPath("\\\\?\\"); 90 if (CurPathLen) { 91 SmallString<80> CurPath; 92 if (std::error_code EC = llvm::sys::fs::current_path(CurPath)) 93 return EC; 94 FullPath.append(CurPath); 95 } 96 // Traverse the requested path, canonicalizing . and .. as we go (because 97 // the \\?\ prefix is documented to treat them as real components). 98 // The iterators don't report separators and append() always attaches 99 // preferred_separator so we don't need to call native() on the result. 100 for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str), 101 E = llvm::sys::path::end(Path8Str); 102 I != E; ++I) { 103 if (I->size() == 1 && *I == ".") 104 continue; 105 if (I->size() == 2 && *I == "..") 106 llvm::sys::path::remove_filename(FullPath); 107 else 108 llvm::sys::path::append(FullPath, *I); 109 } 110 return UTF8ToUTF16(FullPath, Path16); 111 } 112 113 // Just use the caller's original path. 114 return UTF8ToUTF16(Path8Str, Path16); 115} 116} // end namespace path 117 118namespace fs { 119 120std::string getMainExecutable(const char *argv0, void *MainExecAddr) { 121 SmallVector<wchar_t, MAX_PATH> PathName; 122 DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity()); 123 124 // A zero return value indicates a failure other than insufficient space. 125 if (Size == 0) 126 return ""; 127 128 // Insufficient space is determined by a return value equal to the size of 129 // the buffer passed in. 130 if (Size == PathName.capacity()) 131 return ""; 132 133 // On success, GetModuleFileNameW returns the number of characters written to 134 // the buffer not including the NULL terminator. 135 PathName.set_size(Size); 136 137 // Convert the result from UTF-16 to UTF-8. 138 SmallVector<char, MAX_PATH> PathNameUTF8; 139 if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8)) 140 return ""; 141 142 return std::string(PathNameUTF8.data()); 143} 144 145UniqueID file_status::getUniqueID() const { 146 // The file is uniquely identified by the volume serial number along 147 // with the 64-bit file identifier. 148 uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) | 149 static_cast<uint64_t>(FileIndexLow); 150 151 return UniqueID(VolumeSerialNumber, FileID); 152} 153 154TimeValue file_status::getLastModificationTime() const { 155 ULARGE_INTEGER UI; 156 UI.LowPart = LastWriteTimeLow; 157 UI.HighPart = LastWriteTimeHigh; 158 159 TimeValue Ret; 160 Ret.fromWin32Time(UI.QuadPart); 161 return Ret; 162} 163 164std::error_code current_path(SmallVectorImpl<char> &result) { 165 SmallVector<wchar_t, MAX_PATH> cur_path; 166 DWORD len = MAX_PATH; 167 168 do { 169 cur_path.reserve(len); 170 len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data()); 171 172 // A zero return value indicates a failure other than insufficient space. 173 if (len == 0) 174 return mapWindowsError(::GetLastError()); 175 176 // If there's insufficient space, the len returned is larger than the len 177 // given. 178 } while (len > cur_path.capacity()); 179 180 // On success, GetCurrentDirectoryW returns the number of characters not 181 // including the null-terminator. 182 cur_path.set_size(len); 183 return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result); 184} 185 186std::error_code create_directory(const Twine &path, bool IgnoreExisting, 187 perms Perms) { 188 SmallVector<wchar_t, 128> path_utf16; 189 190 if (std::error_code ec = widenPath(path, path_utf16)) 191 return ec; 192 193 if (!::CreateDirectoryW(path_utf16.begin(), NULL)) { 194 DWORD LastError = ::GetLastError(); 195 if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting) 196 return mapWindowsError(LastError); 197 } 198 199 return std::error_code(); 200} 201 202// We can't use symbolic links for windows. 203std::error_code create_link(const Twine &to, const Twine &from) { 204 // Convert to utf-16. 205 SmallVector<wchar_t, 128> wide_from; 206 SmallVector<wchar_t, 128> wide_to; 207 if (std::error_code ec = widenPath(from, wide_from)) 208 return ec; 209 if (std::error_code ec = widenPath(to, wide_to)) 210 return ec; 211 212 if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL)) 213 return mapWindowsError(::GetLastError()); 214 215 return std::error_code(); 216} 217 218std::error_code remove(const Twine &path, bool IgnoreNonExisting) { 219 SmallVector<wchar_t, 128> path_utf16; 220 221 file_status ST; 222 if (std::error_code EC = status(path, ST)) { 223 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting) 224 return EC; 225 return std::error_code(); 226 } 227 228 if (std::error_code ec = widenPath(path, path_utf16)) 229 return ec; 230 231 if (ST.type() == file_type::directory_file) { 232 if (!::RemoveDirectoryW(c_str(path_utf16))) { 233 std::error_code EC = mapWindowsError(::GetLastError()); 234 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting) 235 return EC; 236 } 237 return std::error_code(); 238 } 239 if (!::DeleteFileW(c_str(path_utf16))) { 240 std::error_code EC = mapWindowsError(::GetLastError()); 241 if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting) 242 return EC; 243 } 244 return std::error_code(); 245} 246 247std::error_code rename(const Twine &from, const Twine &to) { 248 // Convert to utf-16. 249 SmallVector<wchar_t, 128> wide_from; 250 SmallVector<wchar_t, 128> wide_to; 251 if (std::error_code ec = widenPath(from, wide_from)) 252 return ec; 253 if (std::error_code ec = widenPath(to, wide_to)) 254 return ec; 255 256 std::error_code ec = std::error_code(); 257 258 // Retry while we see ERROR_ACCESS_DENIED. 259 // System scanners (eg. indexer) might open the source file when it is written 260 // and closed. 261 262 for (int i = 0; i < 2000; i++) { 263 // Try ReplaceFile first, as it is able to associate a new data stream with 264 // the destination even if the destination file is currently open. 265 if (::ReplaceFileW(wide_to.begin(), wide_from.begin(), NULL, 0, NULL, NULL)) 266 return std::error_code(); 267 268 // We get ERROR_FILE_NOT_FOUND if the destination file is missing. 269 // MoveFileEx can handle this case. 270 DWORD ReplaceError = ::GetLastError(); 271 ec = mapWindowsError(ReplaceError); 272 if (ReplaceError != ERROR_ACCESS_DENIED && 273 ReplaceError != ERROR_FILE_NOT_FOUND && 274 ReplaceError != ERROR_SHARING_VIOLATION) 275 break; 276 277 if (::MoveFileExW(wide_from.begin(), wide_to.begin(), 278 MOVEFILE_COPY_ALLOWED | MOVEFILE_REPLACE_EXISTING)) 279 return std::error_code(); 280 281 DWORD MoveError = ::GetLastError(); 282 ec = mapWindowsError(MoveError); 283 if (MoveError != ERROR_ACCESS_DENIED) break; 284 285 ::Sleep(1); 286 } 287 288 return ec; 289} 290 291std::error_code resize_file(int FD, uint64_t Size) { 292#ifdef HAVE__CHSIZE_S 293 errno_t error = ::_chsize_s(FD, Size); 294#else 295 errno_t error = ::_chsize(FD, Size); 296#endif 297 return std::error_code(error, std::generic_category()); 298} 299 300std::error_code access(const Twine &Path, AccessMode Mode) { 301 SmallVector<wchar_t, 128> PathUtf16; 302 303 if (std::error_code EC = widenPath(Path, PathUtf16)) 304 return EC; 305 306 DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin()); 307 308 if (Attributes == INVALID_FILE_ATTRIBUTES) { 309 // See if the file didn't actually exist. 310 DWORD LastError = ::GetLastError(); 311 if (LastError != ERROR_FILE_NOT_FOUND && 312 LastError != ERROR_PATH_NOT_FOUND) 313 return mapWindowsError(LastError); 314 return errc::no_such_file_or_directory; 315 } 316 317 if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY)) 318 return errc::permission_denied; 319 320 return std::error_code(); 321} 322 323bool can_execute(const Twine &Path) { 324 return !access(Path, AccessMode::Execute) || 325 !access(Path + ".exe", AccessMode::Execute); 326} 327 328bool equivalent(file_status A, file_status B) { 329 assert(status_known(A) && status_known(B)); 330 return A.FileIndexHigh == B.FileIndexHigh && 331 A.FileIndexLow == B.FileIndexLow && 332 A.FileSizeHigh == B.FileSizeHigh && 333 A.FileSizeLow == B.FileSizeLow && 334 A.LastWriteTimeHigh == B.LastWriteTimeHigh && 335 A.LastWriteTimeLow == B.LastWriteTimeLow && 336 A.VolumeSerialNumber == B.VolumeSerialNumber; 337} 338 339std::error_code equivalent(const Twine &A, const Twine &B, bool &result) { 340 file_status fsA, fsB; 341 if (std::error_code ec = status(A, fsA)) 342 return ec; 343 if (std::error_code ec = status(B, fsB)) 344 return ec; 345 result = equivalent(fsA, fsB); 346 return std::error_code(); 347} 348 349static bool isReservedName(StringRef path) { 350 // This list of reserved names comes from MSDN, at: 351 // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx 352 static const char *const sReservedNames[] = { "nul", "con", "prn", "aux", 353 "com1", "com2", "com3", "com4", 354 "com5", "com6", "com7", "com8", 355 "com9", "lpt1", "lpt2", "lpt3", 356 "lpt4", "lpt5", "lpt6", "lpt7", 357 "lpt8", "lpt9" }; 358 359 // First, check to see if this is a device namespace, which always 360 // starts with \\.\, since device namespaces are not legal file paths. 361 if (path.startswith("\\\\.\\")) 362 return true; 363 364 // Then compare against the list of ancient reserved names 365 for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) { 366 if (path.equals_lower(sReservedNames[i])) 367 return true; 368 } 369 370 // The path isn't what we consider reserved. 371 return false; 372} 373 374static std::error_code getStatus(HANDLE FileHandle, file_status &Result) { 375 if (FileHandle == INVALID_HANDLE_VALUE) 376 goto handle_status_error; 377 378 switch (::GetFileType(FileHandle)) { 379 default: 380 llvm_unreachable("Don't know anything about this file type"); 381 case FILE_TYPE_UNKNOWN: { 382 DWORD Err = ::GetLastError(); 383 if (Err != NO_ERROR) 384 return mapWindowsError(Err); 385 Result = file_status(file_type::type_unknown); 386 return std::error_code(); 387 } 388 case FILE_TYPE_DISK: 389 break; 390 case FILE_TYPE_CHAR: 391 Result = file_status(file_type::character_file); 392 return std::error_code(); 393 case FILE_TYPE_PIPE: 394 Result = file_status(file_type::fifo_file); 395 return std::error_code(); 396 } 397 398 BY_HANDLE_FILE_INFORMATION Info; 399 if (!::GetFileInformationByHandle(FileHandle, &Info)) 400 goto handle_status_error; 401 402 { 403 file_type Type = (Info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) 404 ? file_type::directory_file 405 : file_type::regular_file; 406 Result = 407 file_status(Type, Info.ftLastWriteTime.dwHighDateTime, 408 Info.ftLastWriteTime.dwLowDateTime, 409 Info.dwVolumeSerialNumber, Info.nFileSizeHigh, 410 Info.nFileSizeLow, Info.nFileIndexHigh, Info.nFileIndexLow); 411 return std::error_code(); 412 } 413 414handle_status_error: 415 DWORD LastError = ::GetLastError(); 416 if (LastError == ERROR_FILE_NOT_FOUND || 417 LastError == ERROR_PATH_NOT_FOUND) 418 Result = file_status(file_type::file_not_found); 419 else if (LastError == ERROR_SHARING_VIOLATION) 420 Result = file_status(file_type::type_unknown); 421 else 422 Result = file_status(file_type::status_error); 423 return mapWindowsError(LastError); 424} 425 426std::error_code status(const Twine &path, file_status &result) { 427 SmallString<128> path_storage; 428 SmallVector<wchar_t, 128> path_utf16; 429 430 StringRef path8 = path.toStringRef(path_storage); 431 if (isReservedName(path8)) { 432 result = file_status(file_type::character_file); 433 return std::error_code(); 434 } 435 436 if (std::error_code ec = widenPath(path8, path_utf16)) 437 return ec; 438 439 DWORD attr = ::GetFileAttributesW(path_utf16.begin()); 440 if (attr == INVALID_FILE_ATTRIBUTES) 441 return getStatus(INVALID_HANDLE_VALUE, result); 442 443 // Handle reparse points. 444 if (attr & FILE_ATTRIBUTE_REPARSE_POINT) { 445 ScopedFileHandle h( 446 ::CreateFileW(path_utf16.begin(), 447 0, // Attributes only. 448 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 449 NULL, 450 OPEN_EXISTING, 451 FILE_FLAG_BACKUP_SEMANTICS, 452 0)); 453 if (!h) 454 return getStatus(INVALID_HANDLE_VALUE, result); 455 } 456 457 ScopedFileHandle h( 458 ::CreateFileW(path_utf16.begin(), 0, // Attributes only. 459 FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 460 NULL, OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS, 0)); 461 if (!h) 462 return getStatus(INVALID_HANDLE_VALUE, result); 463 464 return getStatus(h, result); 465} 466 467std::error_code status(int FD, file_status &Result) { 468 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 469 return getStatus(FileHandle, Result); 470} 471 472std::error_code setLastModificationAndAccessTime(int FD, TimeValue Time) { 473 ULARGE_INTEGER UI; 474 UI.QuadPart = Time.toWin32Time(); 475 FILETIME FT; 476 FT.dwLowDateTime = UI.LowPart; 477 FT.dwHighDateTime = UI.HighPart; 478 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 479 if (!SetFileTime(FileHandle, NULL, &FT, &FT)) 480 return mapWindowsError(::GetLastError()); 481 return std::error_code(); 482} 483 484std::error_code mapped_file_region::init(int FD, uint64_t Offset, 485 mapmode Mode) { 486 // Make sure that the requested size fits within SIZE_T. 487 if (Size > std::numeric_limits<SIZE_T>::max()) 488 return make_error_code(errc::invalid_argument); 489 490 HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 491 if (FileHandle == INVALID_HANDLE_VALUE) 492 return make_error_code(errc::bad_file_descriptor); 493 494 DWORD flprotect; 495 switch (Mode) { 496 case readonly: flprotect = PAGE_READONLY; break; 497 case readwrite: flprotect = PAGE_READWRITE; break; 498 case priv: flprotect = PAGE_WRITECOPY; break; 499 } 500 501 HANDLE FileMappingHandle = 502 ::CreateFileMappingW(FileHandle, 0, flprotect, 503 (Offset + Size) >> 32, 504 (Offset + Size) & 0xffffffff, 505 0); 506 if (FileMappingHandle == NULL) { 507 std::error_code ec = mapWindowsError(GetLastError()); 508 return ec; 509 } 510 511 DWORD dwDesiredAccess; 512 switch (Mode) { 513 case readonly: dwDesiredAccess = FILE_MAP_READ; break; 514 case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break; 515 case priv: dwDesiredAccess = FILE_MAP_COPY; break; 516 } 517 Mapping = ::MapViewOfFile(FileMappingHandle, 518 dwDesiredAccess, 519 Offset >> 32, 520 Offset & 0xffffffff, 521 Size); 522 if (Mapping == NULL) { 523 std::error_code ec = mapWindowsError(GetLastError()); 524 ::CloseHandle(FileMappingHandle); 525 return ec; 526 } 527 528 if (Size == 0) { 529 MEMORY_BASIC_INFORMATION mbi; 530 SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi)); 531 if (Result == 0) { 532 std::error_code ec = mapWindowsError(GetLastError()); 533 ::UnmapViewOfFile(Mapping); 534 ::CloseHandle(FileMappingHandle); 535 return ec; 536 } 537 Size = mbi.RegionSize; 538 } 539 540 // Close all the handles except for the view. It will keep the other handles 541 // alive. 542 ::CloseHandle(FileMappingHandle); 543 return std::error_code(); 544} 545 546mapped_file_region::mapped_file_region(int fd, mapmode mode, uint64_t length, 547 uint64_t offset, std::error_code &ec) 548 : Size(length), Mapping() { 549 ec = init(fd, offset, mode); 550 if (ec) 551 Mapping = 0; 552} 553 554mapped_file_region::~mapped_file_region() { 555 if (Mapping) 556 ::UnmapViewOfFile(Mapping); 557} 558 559uint64_t mapped_file_region::size() const { 560 assert(Mapping && "Mapping failed but used anyway!"); 561 return Size; 562} 563 564char *mapped_file_region::data() const { 565 assert(Mapping && "Mapping failed but used anyway!"); 566 return reinterpret_cast<char*>(Mapping); 567} 568 569const char *mapped_file_region::const_data() const { 570 assert(Mapping && "Mapping failed but used anyway!"); 571 return reinterpret_cast<const char*>(Mapping); 572} 573 574int mapped_file_region::alignment() { 575 SYSTEM_INFO SysInfo; 576 ::GetSystemInfo(&SysInfo); 577 return SysInfo.dwAllocationGranularity; 578} 579 580std::error_code detail::directory_iterator_construct(detail::DirIterState &it, 581 StringRef path){ 582 SmallVector<wchar_t, 128> path_utf16; 583 584 if (std::error_code ec = widenPath(path, path_utf16)) 585 return ec; 586 587 // Convert path to the format that Windows is happy with. 588 if (path_utf16.size() > 0 && 589 !is_separator(path_utf16[path.size() - 1]) && 590 path_utf16[path.size() - 1] != L':') { 591 path_utf16.push_back(L'\\'); 592 path_utf16.push_back(L'*'); 593 } else { 594 path_utf16.push_back(L'*'); 595 } 596 597 // Get the first directory entry. 598 WIN32_FIND_DATAW FirstFind; 599 ScopedFindHandle FindHandle(::FindFirstFileW(c_str(path_utf16), &FirstFind)); 600 if (!FindHandle) 601 return mapWindowsError(::GetLastError()); 602 603 size_t FilenameLen = ::wcslen(FirstFind.cFileName); 604 while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') || 605 (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' && 606 FirstFind.cFileName[1] == L'.')) 607 if (!::FindNextFileW(FindHandle, &FirstFind)) { 608 DWORD LastError = ::GetLastError(); 609 // Check for end. 610 if (LastError == ERROR_NO_MORE_FILES) 611 return detail::directory_iterator_destruct(it); 612 return mapWindowsError(LastError); 613 } else 614 FilenameLen = ::wcslen(FirstFind.cFileName); 615 616 // Construct the current directory entry. 617 SmallString<128> directory_entry_name_utf8; 618 if (std::error_code ec = 619 UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName), 620 directory_entry_name_utf8)) 621 return ec; 622 623 it.IterationHandle = intptr_t(FindHandle.take()); 624 SmallString<128> directory_entry_path(path); 625 path::append(directory_entry_path, directory_entry_name_utf8); 626 it.CurrentEntry = directory_entry(directory_entry_path); 627 628 return std::error_code(); 629} 630 631std::error_code detail::directory_iterator_destruct(detail::DirIterState &it) { 632 if (it.IterationHandle != 0) 633 // Closes the handle if it's valid. 634 ScopedFindHandle close(HANDLE(it.IterationHandle)); 635 it.IterationHandle = 0; 636 it.CurrentEntry = directory_entry(); 637 return std::error_code(); 638} 639 640std::error_code detail::directory_iterator_increment(detail::DirIterState &it) { 641 WIN32_FIND_DATAW FindData; 642 if (!::FindNextFileW(HANDLE(it.IterationHandle), &FindData)) { 643 DWORD LastError = ::GetLastError(); 644 // Check for end. 645 if (LastError == ERROR_NO_MORE_FILES) 646 return detail::directory_iterator_destruct(it); 647 return mapWindowsError(LastError); 648 } 649 650 size_t FilenameLen = ::wcslen(FindData.cFileName); 651 if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') || 652 (FilenameLen == 2 && FindData.cFileName[0] == L'.' && 653 FindData.cFileName[1] == L'.')) 654 return directory_iterator_increment(it); 655 656 SmallString<128> directory_entry_path_utf8; 657 if (std::error_code ec = 658 UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName), 659 directory_entry_path_utf8)) 660 return ec; 661 662 it.CurrentEntry.replace_filename(Twine(directory_entry_path_utf8)); 663 return std::error_code(); 664} 665 666std::error_code openFileForRead(const Twine &Name, int &ResultFD) { 667 SmallVector<wchar_t, 128> PathUTF16; 668 669 if (std::error_code EC = widenPath(Name, PathUTF16)) 670 return EC; 671 672 HANDLE H = 673 ::CreateFileW(PathUTF16.begin(), GENERIC_READ, 674 FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 675 NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 676 if (H == INVALID_HANDLE_VALUE) { 677 DWORD LastError = ::GetLastError(); 678 std::error_code EC = mapWindowsError(LastError); 679 // Provide a better error message when trying to open directories. 680 // This only runs if we failed to open the file, so there is probably 681 // no performances issues. 682 if (LastError != ERROR_ACCESS_DENIED) 683 return EC; 684 if (is_directory(Name)) 685 return make_error_code(errc::is_a_directory); 686 return EC; 687 } 688 689 int FD = ::_open_osfhandle(intptr_t(H), 0); 690 if (FD == -1) { 691 ::CloseHandle(H); 692 return mapWindowsError(ERROR_INVALID_HANDLE); 693 } 694 695 ResultFD = FD; 696 return std::error_code(); 697} 698 699std::error_code openFileForWrite(const Twine &Name, int &ResultFD, 700 sys::fs::OpenFlags Flags, unsigned Mode) { 701 // Verify that we don't have both "append" and "excl". 702 assert((!(Flags & sys::fs::F_Excl) || !(Flags & sys::fs::F_Append)) && 703 "Cannot specify both 'excl' and 'append' file creation flags!"); 704 705 SmallVector<wchar_t, 128> PathUTF16; 706 707 if (std::error_code EC = widenPath(Name, PathUTF16)) 708 return EC; 709 710 DWORD CreationDisposition; 711 if (Flags & F_Excl) 712 CreationDisposition = CREATE_NEW; 713 else if (Flags & F_Append) 714 CreationDisposition = OPEN_ALWAYS; 715 else 716 CreationDisposition = CREATE_ALWAYS; 717 718 DWORD Access = GENERIC_WRITE; 719 if (Flags & F_RW) 720 Access |= GENERIC_READ; 721 722 HANDLE H = ::CreateFileW(PathUTF16.begin(), Access, 723 FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, 724 CreationDisposition, FILE_ATTRIBUTE_NORMAL, NULL); 725 726 if (H == INVALID_HANDLE_VALUE) { 727 DWORD LastError = ::GetLastError(); 728 std::error_code EC = mapWindowsError(LastError); 729 // Provide a better error message when trying to open directories. 730 // This only runs if we failed to open the file, so there is probably 731 // no performances issues. 732 if (LastError != ERROR_ACCESS_DENIED) 733 return EC; 734 if (is_directory(Name)) 735 return make_error_code(errc::is_a_directory); 736 return EC; 737 } 738 739 int OpenFlags = 0; 740 if (Flags & F_Append) 741 OpenFlags |= _O_APPEND; 742 743 if (Flags & F_Text) 744 OpenFlags |= _O_TEXT; 745 746 int FD = ::_open_osfhandle(intptr_t(H), OpenFlags); 747 if (FD == -1) { 748 ::CloseHandle(H); 749 return mapWindowsError(ERROR_INVALID_HANDLE); 750 } 751 752 ResultFD = FD; 753 return std::error_code(); 754} 755} // end namespace fs 756 757namespace path { 758static bool getKnownFolderPath(KNOWNFOLDERID folderId, 759 SmallVectorImpl<char> &result) { 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} 768 769bool getUserCacheDir(SmallVectorImpl<char> &Result) { 770 return getKnownFolderPath(FOLDERID_LocalAppData, Result); 771} 772 773bool home_directory(SmallVectorImpl<char> &result) { 774 return getKnownFolderPath(FOLDERID_Profile, result); 775} 776 777static bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) { 778 SmallVector<wchar_t, 1024> Buf; 779 size_t Size = 1024; 780 do { 781 Buf.reserve(Size); 782 Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity()); 783 if (Size == 0) 784 return false; 785 786 // Try again with larger buffer. 787 } while (Size > Buf.capacity()); 788 Buf.set_size(Size); 789 790 return !windows::UTF16ToUTF8(Buf.data(), Size, Res); 791} 792 793static bool getTempDirEnvVar(SmallVectorImpl<char> &Res) { 794 const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"}; 795 for (auto *Env : EnvironmentVariables) { 796 if (getTempDirEnvVar(Env, Res)) 797 return true; 798 } 799 return false; 800} 801 802void system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) { 803 (void)ErasedOnReboot; 804 Result.clear(); 805 806 // Check whether the temporary directory is specified by an environment var. 807 // This matches GetTempPath logic to some degree. GetTempPath is not used 808 // directly as it cannot handle evn var longer than 130 chars on Windows 7 809 // (fixed on Windows 8). 810 if (getTempDirEnvVar(Result)) { 811 assert(!Result.empty() && "Unexpected empty path"); 812 native(Result); // Some Unix-like shells use Unix path separator in $TMP. 813 fs::make_absolute(Result); // Make it absolute if not already. 814 return; 815 } 816 817 // Fall back to a system default. 818 const char *DefaultResult = "C:\\Temp"; 819 Result.append(DefaultResult, DefaultResult + strlen(DefaultResult)); 820} 821} // end namespace path 822 823namespace windows { 824std::error_code UTF8ToUTF16(llvm::StringRef utf8, 825 llvm::SmallVectorImpl<wchar_t> &utf16) { 826 if (!utf8.empty()) { 827 int len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(), 828 utf8.size(), utf16.begin(), 0); 829 830 if (len == 0) 831 return mapWindowsError(::GetLastError()); 832 833 utf16.reserve(len + 1); 834 utf16.set_size(len); 835 836 len = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8.begin(), 837 utf8.size(), utf16.begin(), utf16.size()); 838 839 if (len == 0) 840 return mapWindowsError(::GetLastError()); 841 } 842 843 // Make utf16 null terminated. 844 utf16.push_back(0); 845 utf16.pop_back(); 846 847 return std::error_code(); 848} 849 850static 851std::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16, 852 size_t utf16_len, 853 llvm::SmallVectorImpl<char> &utf8) { 854 if (utf16_len) { 855 // Get length. 856 int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.begin(), 857 0, NULL, NULL); 858 859 if (len == 0) 860 return mapWindowsError(::GetLastError()); 861 862 utf8.reserve(len); 863 utf8.set_size(len); 864 865 // Now do the actual conversion. 866 len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, utf8.data(), 867 utf8.size(), NULL, NULL); 868 869 if (len == 0) 870 return mapWindowsError(::GetLastError()); 871 } 872 873 // Make utf8 null terminated. 874 utf8.push_back(0); 875 utf8.pop_back(); 876 877 return std::error_code(); 878} 879 880std::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len, 881 llvm::SmallVectorImpl<char> &utf8) { 882 return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8); 883} 884 885std::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len, 886 llvm::SmallVectorImpl<char> &utf8) { 887 return UTF16ToCodePage(CP_ACP, utf16, utf16_len, utf8); 888} 889} // end namespace windows 890} // end namespace sys 891} // end namespace llvm 892