1261991Sdim//===- llvm/Support/Windows/Path.inc - Windows Path Impl --------*- C++ -*-===// 2218885Sdim// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6218885Sdim// 7218885Sdim//===----------------------------------------------------------------------===// 8218885Sdim// 9261991Sdim// This file implements the Windows specific implementation of the Path API. 10218885Sdim// 11218885Sdim//===----------------------------------------------------------------------===// 12218885Sdim 13218885Sdim//===----------------------------------------------------------------------===// 14261991Sdim//=== WARNING: Implementation here must contain only generic Windows code that 15261991Sdim//=== is guaranteed to work on *all* Windows variants. 16218885Sdim//===----------------------------------------------------------------------===// 17218885Sdim 18261991Sdim#include "llvm/ADT/STLExtras.h" 19341825Sdim#include "llvm/Support/ConvertUTF.h" 20276479Sdim#include "llvm/Support/WindowsError.h" 21261991Sdim#include <fcntl.h> 22261991Sdim#include <io.h> 23261991Sdim#include <sys/stat.h> 24261991Sdim#include <sys/types.h> 25218885Sdim 26276479Sdim// These two headers must be included last, and make sure shlobj is required 27276479Sdim// after Windows.h to make sure it picks up our definition of _WIN32_WINNT 28360784Sdim#include "llvm/Support/Windows/WindowsSupport.h" 29321369Sdim#include <shellapi.h> 30276479Sdim#include <shlobj.h> 31276479Sdim 32261991Sdim#undef max 33218885Sdim 34261991Sdim// MinGW doesn't define this. 35261991Sdim#ifndef _ERRNO_T_DEFINED 36261991Sdim#define _ERRNO_T_DEFINED 37261991Sdimtypedef int errno_t; 38261991Sdim#endif 39218885Sdim 40261991Sdim#ifdef _MSC_VER 41261991Sdim# pragma comment(lib, "advapi32.lib") // This provides CryptAcquireContextW. 42296417Sdim# pragma comment(lib, "ole32.lib") // This provides CoTaskMemFree 43261991Sdim#endif 44218885Sdim 45261991Sdimusing namespace llvm; 46218885Sdim 47261991Sdimusing llvm::sys::windows::UTF8ToUTF16; 48341825Sdimusing llvm::sys::windows::CurCPToUTF16; 49261991Sdimusing llvm::sys::windows::UTF16ToUTF8; 50280031Sdimusing llvm::sys::path::widenPath; 51218885Sdim 52276479Sdimstatic bool is_separator(const wchar_t value) { 53276479Sdim switch (value) { 54276479Sdim case L'\\': 55276479Sdim case L'/': 56276479Sdim return true; 57276479Sdim default: 58276479Sdim return false; 59218885Sdim } 60218885Sdim} 61218885Sdim 62261991Sdimnamespace llvm { 63261991Sdimnamespace sys { 64280031Sdimnamespace path { 65280031Sdim 66280031Sdim// Convert a UTF-8 path to UTF-16. Also, if the absolute equivalent of the 67280031Sdim// path is longer than CreateDirectory can tolerate, make it absolute and 68280031Sdim// prefixed by '\\?\'. 69280031Sdimstd::error_code widenPath(const Twine &Path8, 70280031Sdim SmallVectorImpl<wchar_t> &Path16) { 71280031Sdim const size_t MaxDirLen = MAX_PATH - 12; // Must leave room for 8.3 filename. 72280031Sdim 73280031Sdim // Several operations would convert Path8 to SmallString; more efficient to 74280031Sdim // do it once up front. 75280031Sdim SmallString<128> Path8Str; 76280031Sdim Path8.toVector(Path8Str); 77280031Sdim 78280031Sdim // If we made this path absolute, how much longer would it get? 79280031Sdim size_t CurPathLen; 80280031Sdim if (llvm::sys::path::is_absolute(Twine(Path8Str))) 81280031Sdim CurPathLen = 0; // No contribution from current_path needed. 82280031Sdim else { 83280031Sdim CurPathLen = ::GetCurrentDirectoryW(0, NULL); 84280031Sdim if (CurPathLen == 0) 85288943Sdim return mapWindowsError(::GetLastError()); 86280031Sdim } 87280031Sdim 88280031Sdim // Would the absolute path be longer than our limit? 89280031Sdim if ((Path8Str.size() + CurPathLen) >= MaxDirLen && 90280031Sdim !Path8Str.startswith("\\\\?\\")) { 91280031Sdim SmallString<2*MAX_PATH> FullPath("\\\\?\\"); 92280031Sdim if (CurPathLen) { 93280031Sdim SmallString<80> CurPath; 94280031Sdim if (std::error_code EC = llvm::sys::fs::current_path(CurPath)) 95280031Sdim return EC; 96280031Sdim FullPath.append(CurPath); 97280031Sdim } 98327952Sdim // Traverse the requested path, canonicalizing . and .. (because the \\?\ 99327952Sdim // prefix is documented to treat them as real components). Ignore 100327952Sdim // separators, which can be returned from the iterator if the path has a 101327952Sdim // drive name. We don't need to call native() on the result since append() 102327952Sdim // always attaches preferred_separator. 103280031Sdim for (llvm::sys::path::const_iterator I = llvm::sys::path::begin(Path8Str), 104280031Sdim E = llvm::sys::path::end(Path8Str); 105280031Sdim I != E; ++I) { 106327952Sdim if (I->size() == 1 && is_separator((*I)[0])) 107327952Sdim continue; 108280031Sdim if (I->size() == 1 && *I == ".") 109280031Sdim continue; 110280031Sdim if (I->size() == 2 && *I == "..") 111280031Sdim llvm::sys::path::remove_filename(FullPath); 112280031Sdim else 113280031Sdim llvm::sys::path::append(FullPath, *I); 114280031Sdim } 115280031Sdim return UTF8ToUTF16(FullPath, Path16); 116280031Sdim } 117280031Sdim 118280031Sdim // Just use the caller's original path. 119280031Sdim return UTF8ToUTF16(Path8Str, Path16); 120280031Sdim} 121280031Sdim} // end namespace path 122280031Sdim 123261991Sdimnamespace fs { 124218885Sdim 125341825Sdimconst file_t kInvalidFile = INVALID_HANDLE_VALUE; 126341825Sdim 127261991Sdimstd::string getMainExecutable(const char *argv0, void *MainExecAddr) { 128261991Sdim SmallVector<wchar_t, MAX_PATH> PathName; 129261991Sdim DWORD Size = ::GetModuleFileNameW(NULL, PathName.data(), PathName.capacity()); 130218885Sdim 131261991Sdim // A zero return value indicates a failure other than insufficient space. 132261991Sdim if (Size == 0) 133261991Sdim return ""; 134218885Sdim 135261991Sdim // Insufficient space is determined by a return value equal to the size of 136261991Sdim // the buffer passed in. 137261991Sdim if (Size == PathName.capacity()) 138261991Sdim return ""; 139218885Sdim 140261991Sdim // On success, GetModuleFileNameW returns the number of characters written to 141261991Sdim // the buffer not including the NULL terminator. 142261991Sdim PathName.set_size(Size); 143218885Sdim 144261991Sdim // Convert the result from UTF-16 to UTF-8. 145261991Sdim SmallVector<char, MAX_PATH> PathNameUTF8; 146261991Sdim if (UTF16ToUTF8(PathName.data(), PathName.size(), PathNameUTF8)) 147261991Sdim return ""; 148218885Sdim 149261991Sdim return std::string(PathNameUTF8.data()); 150218885Sdim} 151218885Sdim 152261991SdimUniqueID file_status::getUniqueID() const { 153261991Sdim // The file is uniquely identified by the volume serial number along 154261991Sdim // with the 64-bit file identifier. 155261991Sdim uint64_t FileID = (static_cast<uint64_t>(FileIndexHigh) << 32ULL) | 156261991Sdim static_cast<uint64_t>(FileIndexLow); 157261991Sdim 158261991Sdim return UniqueID(VolumeSerialNumber, FileID); 159218885Sdim} 160218885Sdim 161309124SdimErrorOrdisk_space(const Twine &Path) { 162309124Sdim ULARGE_INTEGER Avail, Total, Free; 163309124Sdim if (!::GetDiskFreeSpaceExA(Path.str().c_str(), &Avail, &Total, &Free)) 164309124Sdim return mapWindowsError(::GetLastError()); 165309124Sdim space_info SpaceInfo; 166309124Sdim SpaceInfo.capacity = 167309124Sdim (static_cast<uint64_t>(Total.HighPart) << 32) + Total.LowPart; 168309124Sdim SpaceInfo.free = (static_cast<uint64_t>(Free.HighPart) << 32) + Free.LowPart; 169309124Sdim SpaceInfo.available = 170309124Sdim (static_cast<uint64_t>(Avail.HighPart) << 32) + Avail.LowPart; 171309124Sdim return SpaceInfo; 172309124Sdim} 173309124Sdim 174327952SdimTimePoint<> basic_file_status::getLastAccessedTime() const { 175314564Sdim FILETIME Time; 176314564Sdim Time.dwLowDateTime = LastAccessedTimeLow; 177314564Sdim Time.dwHighDateTime = LastAccessedTimeHigh; 178314564Sdim return toTimePoint(Time); 179309124Sdim} 180309124Sdim 181327952SdimTimePoint<> basic_file_status::getLastModificationTime() const { 182314564Sdim FILETIME Time; 183314564Sdim Time.dwLowDateTime = LastWriteTimeLow; 184314564Sdim Time.dwHighDateTime = LastWriteTimeHigh; 185314564Sdim return toTimePoint(Time); 186218885Sdim} 187218885Sdim 188321369Sdimuint32_t file_status::getLinkCount() const { 189321369Sdim return NumLinks; 190321369Sdim} 191321369Sdim 192276479Sdimstd::error_code current_path(SmallVectorImpl<char> &result) { 193261991Sdim SmallVector<wchar_t, MAX_PATH> cur_path; 194261991Sdim DWORD len = MAX_PATH; 195218885Sdim 196261991Sdim do { 197261991Sdim cur_path.reserve(len); 198261991Sdim len = ::GetCurrentDirectoryW(cur_path.capacity(), cur_path.data()); 199218885Sdim 200261991Sdim // A zero return value indicates a failure other than insufficient space. 201261991Sdim if (len == 0) 202288943Sdim return mapWindowsError(::GetLastError()); 203218885Sdim 204261991Sdim // If there's insufficient space, the len returned is larger than the len 205261991Sdim // given. 206261991Sdim } while (len > cur_path.capacity()); 207261991Sdim 208261991Sdim // On success, GetCurrentDirectoryW returns the number of characters not 209261991Sdim // including the null-terminator. 210261991Sdim cur_path.set_size(len); 211261991Sdim return UTF16ToUTF8(cur_path.begin(), cur_path.size(), result); 212218885Sdim} 213218885Sdim 214321369Sdimstd::error_code set_current_path(const Twine &path) { 215321369Sdim // Convert to utf-16. 216321369Sdim SmallVector<wchar_t, 128> wide_path; 217321369Sdim if (std::error_code ec = widenPath(path, wide_path)) 218321369Sdim return ec; 219321369Sdim 220321369Sdim if (!::SetCurrentDirectoryW(wide_path.begin())) 221321369Sdim return mapWindowsError(::GetLastError()); 222321369Sdim 223321369Sdim return std::error_code(); 224321369Sdim} 225321369Sdim 226296417Sdimstd::error_code create_directory(const Twine &path, bool IgnoreExisting, 227296417Sdim perms Perms) { 228261991Sdim SmallVector<wchar_t, 128> path_utf16; 229218885Sdim 230280031Sdim if (std::error_code ec = widenPath(path, path_utf16)) 231261991Sdim return ec; 232218885Sdim 233261991Sdim if (!::CreateDirectoryW(path_utf16.begin(), NULL)) { 234276479Sdim DWORD LastError = ::GetLastError(); 235276479Sdim if (LastError != ERROR_ALREADY_EXISTS || !IgnoreExisting) 236288943Sdim return mapWindowsError(LastError); 237276479Sdim } 238218885Sdim 239276479Sdim return std::error_code(); 240218885Sdim} 241218885Sdim 242276479Sdim// We can't use symbolic links for windows. 243276479Sdimstd::error_code create_link(const Twine &to, const Twine &from) { 244261991Sdim // Convert to utf-16. 245261991Sdim SmallVector<wchar_t, 128> wide_from; 246261991Sdim SmallVector<wchar_t, 128> wide_to; 247280031Sdim if (std::error_code ec = widenPath(from, wide_from)) 248276479Sdim return ec; 249280031Sdim if (std::error_code ec = widenPath(to, wide_to)) 250276479Sdim return ec; 251218885Sdim 252276479Sdim if (!::CreateHardLinkW(wide_from.begin(), wide_to.begin(), NULL)) 253288943Sdim return mapWindowsError(::GetLastError()); 254218885Sdim 255276479Sdim return std::error_code(); 256218885Sdim} 257218885Sdim 258314564Sdimstd::error_code create_hard_link(const Twine &to, const Twine &from) { 259327952Sdim return create_link(to, from); 260314564Sdim} 261314564Sdim 262276479Sdimstd::error_code remove(const Twine &path, bool IgnoreNonExisting) { 263261991Sdim SmallVector<wchar_t, 128> path_utf16; 264218885Sdim 265280031Sdim if (std::error_code ec = widenPath(path, path_utf16)) 266261991Sdim return ec; 267261991Sdim 268327952Sdim // We don't know whether this is a file or a directory, and remove() can 269327952Sdim // accept both. The usual way to delete a file or directory is to use one of 270327952Sdim // the DeleteFile or RemoveDirectory functions, but that requires you to know 271327952Sdim // which one it is. We could stat() the file to determine that, but that would 272327952Sdim // cost us additional system calls, which can be slow in a directory 273327952Sdim // containing a large number of files. So instead we call CreateFile directly. 274327952Sdim // The important part is the FILE_FLAG_DELETE_ON_CLOSE flag, which causes the 275327952Sdim // file to be deleted once it is closed. We also use the flags 276327952Sdim // FILE_FLAG_BACKUP_SEMANTICS (which allows us to open directories), and 277327952Sdim // FILE_FLAG_OPEN_REPARSE_POINT (don't follow symlinks). 278327952Sdim ScopedFileHandle h(::CreateFileW( 279327952Sdim c_str(path_utf16), DELETE, 280327952Sdim FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, 281327952Sdim OPEN_EXISTING, 282327952Sdim FILE_ATTRIBUTE_NORMAL | FILE_FLAG_BACKUP_SEMANTICS | 283327952Sdim FILE_FLAG_OPEN_REPARSE_POINT | FILE_FLAG_DELETE_ON_CLOSE, 284327952Sdim NULL)); 285327952Sdim if (!h) { 286288943Sdim std::error_code EC = mapWindowsError(::GetLastError()); 287276479Sdim if (EC != errc::no_such_file_or_directory || !IgnoreNonExisting) 288276479Sdim return EC; 289276479Sdim } 290327952Sdim 291276479Sdim return std::error_code(); 292218885Sdim} 293218885Sdim 294321369Sdimstatic std::error_code is_local_internal(SmallVectorImpl<wchar_t> &Path, 295321369Sdim bool &Result) { 296321369Sdim SmallVector<wchar_t, 128> VolumePath; 297321369Sdim size_t Len = 128; 298321369Sdim while (true) { 299321369Sdim VolumePath.resize(Len); 300321369Sdim BOOL Success = 301321369Sdim ::GetVolumePathNameW(Path.data(), VolumePath.data(), VolumePath.size()); 302321369Sdim 303321369Sdim if (Success) 304321369Sdim break; 305321369Sdim 306321369Sdim DWORD Err = ::GetLastError(); 307321369Sdim if (Err != ERROR_INSUFFICIENT_BUFFER) 308321369Sdim return mapWindowsError(Err); 309321369Sdim 310321369Sdim Len *= 2; 311321369Sdim } 312321369Sdim // If the output buffer has exactly enough space for the path name, but not 313321369Sdim // the null terminator, it will leave the output unterminated. Push a null 314321369Sdim // terminator onto the end to ensure that this never happens. 315321369Sdim VolumePath.push_back(L'\0'); 316321369Sdim VolumePath.set_size(wcslen(VolumePath.data())); 317321369Sdim const wchar_t *P = VolumePath.data(); 318321369Sdim 319321369Sdim UINT Type = ::GetDriveTypeW(P); 320321369Sdim switch (Type) { 321321369Sdim case DRIVE_FIXED: 322321369Sdim Result = true; 323321369Sdim return std::error_code(); 324321369Sdim case DRIVE_REMOTE: 325321369Sdim case DRIVE_CDROM: 326321369Sdim case DRIVE_RAMDISK: 327321369Sdim case DRIVE_REMOVABLE: 328321369Sdim Result = false; 329321369Sdim return std::error_code(); 330321369Sdim default: 331321369Sdim return make_error_code(errc::no_such_file_or_directory); 332321369Sdim } 333321369Sdim llvm_unreachable("Unreachable!"); 334321369Sdim} 335321369Sdim 336321369Sdimstd::error_code is_local(const Twine &path, bool &result) { 337321369Sdim if (!llvm::sys::fs::exists(path) || !llvm::sys::path::has_root_path(path)) 338321369Sdim return make_error_code(errc::no_such_file_or_directory); 339321369Sdim 340321369Sdim SmallString<128> Storage; 341321369Sdim StringRef P = path.toStringRef(Storage); 342321369Sdim 343321369Sdim // Convert to utf-16. 344321369Sdim SmallVector<wchar_t, 128> WidePath; 345321369Sdim if (std::error_code ec = widenPath(P, WidePath)) 346321369Sdim return ec; 347321369Sdim return is_local_internal(WidePath, result); 348321369Sdim} 349321369Sdim 350327952Sdimstatic std::error_code realPathFromHandle(HANDLE H, 351327952Sdim SmallVectorImpl<wchar_t> &Buffer) { 352327952Sdim DWORD CountChars = ::GetFinalPathNameByHandleW( 353327952Sdim H, Buffer.begin(), Buffer.capacity() - 1, FILE_NAME_NORMALIZED); 354327952Sdim if (CountChars > Buffer.capacity()) { 355327952Sdim // The buffer wasn't big enough, try again. In this case the return value 356327952Sdim // *does* indicate the size of the null terminator. 357327952Sdim Buffer.reserve(CountChars); 358327952Sdim CountChars = ::GetFinalPathNameByHandleW( 359327952Sdim H, Buffer.data(), Buffer.capacity() - 1, FILE_NAME_NORMALIZED); 360327952Sdim } 361327952Sdim if (CountChars == 0) 362327952Sdim return mapWindowsError(GetLastError()); 363327952Sdim Buffer.set_size(CountChars); 364327952Sdim return std::error_code(); 365327952Sdim} 366327952Sdim 367327952Sdimstatic std::error_code realPathFromHandle(HANDLE H, 368327952Sdim SmallVectorImpl<char> &RealPath) { 369327952Sdim RealPath.clear(); 370327952Sdim SmallVector<wchar_t, MAX_PATH> Buffer; 371327952Sdim if (std::error_code EC = realPathFromHandle(H, Buffer)) 372327952Sdim return EC; 373327952Sdim 374360784Sdim // Strip the \\?\ prefix. We don't want it ending up in output, and such 375360784Sdim // paths don't get canonicalized by file APIs. 376360784Sdim wchar_t *Data = Buffer.data(); 377327952Sdim DWORD CountChars = Buffer.size(); 378360784Sdim if (CountChars >= 8 && ::memcmp(Data, L"\\\\?\\UNC\\", 16) == 0) { 379360784Sdim // Convert \\?\UNC\foo\bar to \\foo\bar 380360784Sdim CountChars -= 6; 381360784Sdim Data += 6; 382360784Sdim Data[0] = '\\'; 383360784Sdim } else if (CountChars >= 4 && ::memcmp(Data, L"\\\\?\\", 8) == 0) { 384360784Sdim // Convert \\?\c:\foo to c:\foo 385360784Sdim CountChars -= 4; 386360784Sdim Data += 4; 387327952Sdim } 388327952Sdim 389327952Sdim // Convert the result from UTF-16 to UTF-8. 390327952Sdim return UTF16ToUTF8(Data, CountChars, RealPath); 391327952Sdim} 392327952Sdim 393321369Sdimstd::error_code is_local(int FD, bool &Result) { 394321369Sdim SmallVector<wchar_t, 128> FinalPath; 395321369Sdim HANDLE Handle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 396321369Sdim 397327952Sdim if (std::error_code EC = realPathFromHandle(Handle, FinalPath)) 398327952Sdim return EC; 399321369Sdim 400321369Sdim return is_local_internal(FinalPath, Result); 401321369Sdim} 402321369Sdim 403327952Sdimstatic std::error_code setDeleteDisposition(HANDLE Handle, bool Delete) { 404327952Sdim FILE_DISPOSITION_INFO Disposition; 405327952Sdim Disposition.DeleteFile = Delete; 406327952Sdim if (!SetFileInformationByHandle(Handle, FileDispositionInfo, &Disposition, 407327952Sdim sizeof(Disposition))) 408327952Sdim return mapWindowsError(::GetLastError()); 409327952Sdim return std::error_code(); 410327952Sdim} 411261991Sdim 412327952Sdimstatic std::error_code rename_internal(HANDLE FromHandle, const Twine &To, 413327952Sdim bool ReplaceIfExists) { 414327952Sdim SmallVector<wchar_t, 0> ToWide; 415327952Sdim if (auto EC = widenPath(To, ToWide)) 416327952Sdim return EC; 417327952Sdim 418327952Sdim std::vector<char> RenameInfoBuf(sizeof(FILE_RENAME_INFO) - sizeof(wchar_t) + 419327952Sdim (ToWide.size() * sizeof(wchar_t))); 420327952Sdim FILE_RENAME_INFO &RenameInfo = 421327952Sdim *reinterpret_cast<FILE_RENAME_INFO *>(RenameInfoBuf.data()); 422327952Sdim RenameInfo.ReplaceIfExists = ReplaceIfExists; 423327952Sdim RenameInfo.RootDirectory = 0; 424344779Sdim RenameInfo.FileNameLength = ToWide.size() * sizeof(wchar_t); 425327952Sdim std::copy(ToWide.begin(), ToWide.end(), &RenameInfo.FileName[0]); 426327952Sdim 427327952Sdim SetLastError(ERROR_SUCCESS); 428327952Sdim if (!SetFileInformationByHandle(FromHandle, FileRenameInfo, &RenameInfo, 429327952Sdim RenameInfoBuf.size())) { 430327952Sdim unsigned Error = GetLastError(); 431327952Sdim if (Error == ERROR_SUCCESS) 432327952Sdim Error = ERROR_CALL_NOT_IMPLEMENTED; // Wine doesn't always set error code. 433327952Sdim return mapWindowsError(Error); 434327952Sdim } 435327952Sdim 436327952Sdim return std::error_code(); 437327952Sdim} 438327952Sdim 439327952Sdimstatic std::error_code rename_handle(HANDLE FromHandle, const Twine &To) { 440327952Sdim SmallVector<wchar_t, 128> WideTo; 441327952Sdim if (std::error_code EC = widenPath(To, WideTo)) 442327952Sdim return EC; 443327952Sdim 444327952Sdim // We normally expect this loop to succeed after a few iterations. If it 445327952Sdim // requires more than 200 tries, it's more likely that the failures are due to 446327952Sdim // a true error, so stop trying. 447327952Sdim for (unsigned Retry = 0; Retry != 200; ++Retry) { 448327952Sdim auto EC = rename_internal(FromHandle, To, true); 449327952Sdim 450327952Sdim if (EC == 451327952Sdim std::error_code(ERROR_CALL_NOT_IMPLEMENTED, std::system_category())) { 452327952Sdim // Wine doesn't support SetFileInformationByHandle in rename_internal. 453327952Sdim // Fall back to MoveFileEx. 454327952Sdim SmallVector<wchar_t, MAX_PATH> WideFrom; 455327952Sdim if (std::error_code EC2 = realPathFromHandle(FromHandle, WideFrom)) 456327952Sdim return EC2; 457327952Sdim if (::MoveFileExW(WideFrom.begin(), WideTo.begin(), 458327952Sdim MOVEFILE_REPLACE_EXISTING)) 459309124Sdim return std::error_code(); 460327952Sdim return mapWindowsError(GetLastError()); 461327952Sdim } 462296417Sdim 463327952Sdim if (!EC || EC != errc::permission_denied) 464327952Sdim return EC; 465309124Sdim 466327952Sdim // The destination file probably exists and is currently open in another 467327952Sdim // process, either because the file was opened without FILE_SHARE_DELETE or 468327952Sdim // it is mapped into memory (e.g. using MemoryBuffer). Rename it in order to 469327952Sdim // move it out of the way of the source file. Use FILE_FLAG_DELETE_ON_CLOSE 470327952Sdim // to arrange for the destination file to be deleted when the other process 471327952Sdim // closes it. 472327952Sdim ScopedFileHandle ToHandle( 473327952Sdim ::CreateFileW(WideTo.begin(), GENERIC_READ | DELETE, 474327952Sdim FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 475327952Sdim NULL, OPEN_EXISTING, 476327952Sdim FILE_ATTRIBUTE_NORMAL | FILE_FLAG_DELETE_ON_CLOSE, NULL)); 477327952Sdim if (!ToHandle) { 478327952Sdim auto EC = mapWindowsError(GetLastError()); 479327952Sdim // Another process might have raced with us and moved the existing file 480327952Sdim // out of the way before we had a chance to open it. If that happens, try 481327952Sdim // to rename the source file again. 482327952Sdim if (EC == errc::no_such_file_or_directory) 483309124Sdim continue; 484327952Sdim return EC; 485327952Sdim } 486327952Sdim 487327952Sdim BY_HANDLE_FILE_INFORMATION FI; 488327952Sdim if (!GetFileInformationByHandle(ToHandle, &FI)) 489327952Sdim return mapWindowsError(GetLastError()); 490327952Sdim 491327952Sdim // Try to find a unique new name for the destination file. 492327952Sdim for (unsigned UniqueId = 0; UniqueId != 200; ++UniqueId) { 493327952Sdim std::string TmpFilename = (To + ".tmp" + utostr(UniqueId)).str(); 494327952Sdim if (auto EC = rename_internal(ToHandle, TmpFilename, false)) { 495327952Sdim if (EC == errc::file_exists || EC == errc::permission_denied) { 496327952Sdim // Again, another process might have raced with us and moved the file 497327952Sdim // before we could move it. Check whether this is the case, as it 498327952Sdim // might have caused the permission denied error. If that was the 499327952Sdim // case, we don't need to move it ourselves. 500327952Sdim ScopedFileHandle ToHandle2(::CreateFileW( 501327952Sdim WideTo.begin(), 0, 502327952Sdim FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, NULL, 503327952Sdim OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL)); 504327952Sdim if (!ToHandle2) { 505327952Sdim auto EC = mapWindowsError(GetLastError()); 506327952Sdim if (EC == errc::no_such_file_or_directory) 507327952Sdim break; 508327952Sdim return EC; 509327952Sdim } 510327952Sdim BY_HANDLE_FILE_INFORMATION FI2; 511327952Sdim if (!GetFileInformationByHandle(ToHandle2, &FI2)) 512327952Sdim return mapWindowsError(GetLastError()); 513327952Sdim if (FI.nFileIndexHigh != FI2.nFileIndexHigh || 514327952Sdim FI.nFileIndexLow != FI2.nFileIndexLow || 515327952Sdim FI.dwVolumeSerialNumber != FI2.dwVolumeSerialNumber) 516327952Sdim break; 517327952Sdim continue; 518327952Sdim } 519327952Sdim return EC; 520309124Sdim } 521327952Sdim break; 522309124Sdim } 523309124Sdim 524327952Sdim // Okay, the old destination file has probably been moved out of the way at 525327952Sdim // this point, so try to rename the source file again. Still, another 526327952Sdim // process might have raced with us to create and open the destination 527327952Sdim // file, so we need to keep doing this until we succeed. 528327952Sdim } 529296417Sdim 530327952Sdim // The most likely root cause. 531327952Sdim return errc::permission_denied; 532327952Sdim} 533327952Sdim 534327952Sdimstatic std::error_code rename_fd(int FromFD, const Twine &To) { 535327952Sdim HANDLE FromHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FromFD)); 536327952Sdim return rename_handle(FromHandle, To); 537327952Sdim} 538327952Sdim 539327952Sdimstd::error_code rename(const Twine &From, const Twine &To) { 540327952Sdim // Convert to utf-16. 541327952Sdim SmallVector<wchar_t, 128> WideFrom; 542327952Sdim if (std::error_code EC = widenPath(From, WideFrom)) 543327952Sdim return EC; 544327952Sdim 545327952Sdim ScopedFileHandle FromHandle; 546327952Sdim // Retry this a few times to defeat badly behaved file system scanners. 547327952Sdim for (unsigned Retry = 0; Retry != 200; ++Retry) { 548327952Sdim if (Retry != 0) 549327952Sdim ::Sleep(10); 550327952Sdim FromHandle = 551327952Sdim ::CreateFileW(WideFrom.begin(), GENERIC_READ | DELETE, 552327952Sdim FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, 553327952Sdim NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); 554327952Sdim if (FromHandle) 555327952Sdim break; 556261991Sdim } 557327952Sdim if (!FromHandle) 558327952Sdim return mapWindowsError(GetLastError()); 559261991Sdim 560327952Sdim return rename_handle(FromHandle, To); 561218885Sdim} 562218885Sdim 563280031Sdimstd::error_code resize_file(int FD, uint64_t Size) { 564261991Sdim#ifdef HAVE__CHSIZE_S 565280031Sdim errno_t error = ::_chsize_s(FD, Size); 566261991Sdim#else 567280031Sdim errno_t error = ::_chsize(FD, Size); 568261991Sdim#endif 569276479Sdim return std::error_code(error, std::generic_category()); 570218885Sdim} 571218885Sdim 572280031Sdimstd::error_code access(const Twine &Path, AccessMode Mode) { 573280031Sdim SmallVector<wchar_t, 128> PathUtf16; 574218885Sdim 575280031Sdim if (std::error_code EC = widenPath(Path, PathUtf16)) 576280031Sdim return EC; 577218885Sdim 578280031Sdim DWORD Attributes = ::GetFileAttributesW(PathUtf16.begin()); 579218885Sdim 580280031Sdim if (Attributes == INVALID_FILE_ATTRIBUTES) { 581261991Sdim // See if the file didn't actually exist. 582276479Sdim DWORD LastError = ::GetLastError(); 583276479Sdim if (LastError != ERROR_FILE_NOT_FOUND && 584276479Sdim LastError != ERROR_PATH_NOT_FOUND) 585288943Sdim return mapWindowsError(LastError); 586280031Sdim return errc::no_such_file_or_directory; 587280031Sdim } 588218885Sdim 589280031Sdim if (Mode == AccessMode::Write && (Attributes & FILE_ATTRIBUTE_READONLY)) 590280031Sdim return errc::permission_denied; 591218885Sdim 592280031Sdim return std::error_code(); 593261991Sdim} 594218885Sdim 595296417Sdimbool can_execute(const Twine &Path) { 596296417Sdim return !access(Path, AccessMode::Execute) || 597296417Sdim !access(Path + ".exe", AccessMode::Execute); 598296417Sdim} 599296417Sdim 600261991Sdimbool equivalent(file_status A, file_status B) { 601261991Sdim assert(status_known(A) && status_known(B)); 602309124Sdim return A.FileIndexHigh == B.FileIndexHigh && 603309124Sdim A.FileIndexLow == B.FileIndexLow && 604309124Sdim A.FileSizeHigh == B.FileSizeHigh && 605309124Sdim A.FileSizeLow == B.FileSizeLow && 606309124Sdim A.LastAccessedTimeHigh == B.LastAccessedTimeHigh && 607309124Sdim A.LastAccessedTimeLow == B.LastAccessedTimeLow && 608309124Sdim A.LastWriteTimeHigh == B.LastWriteTimeHigh && 609309124Sdim A.LastWriteTimeLow == B.LastWriteTimeLow && 610309124Sdim A.VolumeSerialNumber == B.VolumeSerialNumber; 611218885Sdim} 612218885Sdim 613276479Sdimstd::error_code equivalent(const Twine &A, const Twine &B, bool &result) { 614261991Sdim file_status fsA, fsB; 615276479Sdim if (std::error_code ec = status(A, fsA)) 616276479Sdim return ec; 617276479Sdim if (std::error_code ec = status(B, fsB)) 618276479Sdim return ec; 619261991Sdim result = equivalent(fsA, fsB); 620276479Sdim return std::error_code(); 621261991Sdim} 622218885Sdim 623261991Sdimstatic bool isReservedName(StringRef path) { 624261991Sdim // This list of reserved names comes from MSDN, at: 625261991Sdim // http://msdn.microsoft.com/en-us/library/aa365247%28v=vs.85%29.aspx 626296417Sdim static const char *const sReservedNames[] = { "nul", "con", "prn", "aux", 627296417Sdim "com1", "com2", "com3", "com4", 628296417Sdim "com5", "com6", "com7", "com8", 629296417Sdim "com9", "lpt1", "lpt2", "lpt3", 630296417Sdim "lpt4", "lpt5", "lpt6", "lpt7", 631296417Sdim "lpt8", "lpt9" }; 632218885Sdim 633261991Sdim // First, check to see if this is a device namespace, which always 634261991Sdim // starts with \\.\, since device namespaces are not legal file paths. 635261991Sdim if (path.startswith("\\\\.\\")) 636261991Sdim return true; 637261991Sdim 638309124Sdim // Then compare against the list of ancient reserved names. 639261991Sdim for (size_t i = 0; i < array_lengthof(sReservedNames); ++i) { 640261991Sdim if (path.equals_lower(sReservedNames[i])) 641218885Sdim return true; 642218885Sdim } 643218885Sdim 644261991Sdim // The path isn't what we consider reserved. 645218885Sdim return false; 646218885Sdim} 647218885Sdim 648327952Sdimstatic file_type file_type_from_attrs(DWORD Attrs) { 649327952Sdim return (Attrs & FILE_ATTRIBUTE_DIRECTORY) ? file_type::directory_file 650327952Sdim : file_type::regular_file; 651327952Sdim} 652327952Sdim 653327952Sdimstatic perms perms_from_attrs(DWORD Attrs) { 654327952Sdim return (Attrs & FILE_ATTRIBUTE_READONLY) ? (all_read | all_exe) : all_all; 655327952Sdim} 656327952Sdim 657276479Sdimstatic std::error_code getStatus(HANDLE FileHandle, file_status &Result) { 658261991Sdim if (FileHandle == INVALID_HANDLE_VALUE) 659261991Sdim goto handle_status_error; 660261991Sdim 661261991Sdim switch (::GetFileType(FileHandle)) { 662261991Sdim default: 663261991Sdim llvm_unreachable("Don't know anything about this file type"); 664261991Sdim case FILE_TYPE_UNKNOWN: { 665261991Sdim DWORD Err = ::GetLastError(); 666261991Sdim if (Err != NO_ERROR) 667288943Sdim return mapWindowsError(Err); 668261991Sdim Result = file_status(file_type::type_unknown); 669276479Sdim return std::error_code(); 670218885Sdim } 671261991Sdim case FILE_TYPE_DISK: 672261991Sdim break; 673261991Sdim case FILE_TYPE_CHAR: 674261991Sdim Result = file_status(file_type::character_file); 675276479Sdim return std::error_code(); 676261991Sdim case FILE_TYPE_PIPE: 677261991Sdim Result = file_status(file_type::fifo_file); 678276479Sdim return std::error_code(); 679261991Sdim } 680218885Sdim 681261991Sdim BY_HANDLE_FILE_INFORMATION Info; 682261991Sdim if (!::GetFileInformationByHandle(FileHandle, &Info)) 683261991Sdim goto handle_status_error; 684261991Sdim 685327952Sdim Result = file_status( 686327952Sdim file_type_from_attrs(Info.dwFileAttributes), 687327952Sdim perms_from_attrs(Info.dwFileAttributes), Info.nNumberOfLinks, 688327952Sdim Info.ftLastAccessTime.dwHighDateTime, Info.ftLastAccessTime.dwLowDateTime, 689327952Sdim Info.ftLastWriteTime.dwHighDateTime, Info.ftLastWriteTime.dwLowDateTime, 690327952Sdim Info.dwVolumeSerialNumber, Info.nFileSizeHigh, Info.nFileSizeLow, 691327952Sdim Info.nFileIndexHigh, Info.nFileIndexLow); 692327952Sdim return std::error_code(); 693218885Sdim 694261991Sdimhandle_status_error: 695276479Sdim DWORD LastError = ::GetLastError(); 696276479Sdim if (LastError == ERROR_FILE_NOT_FOUND || 697276479Sdim LastError == ERROR_PATH_NOT_FOUND) 698261991Sdim Result = file_status(file_type::file_not_found); 699276479Sdim else if (LastError == ERROR_SHARING_VIOLATION) 700261991Sdim Result = file_status(file_type::type_unknown); 701218885Sdim else 702261991Sdim Result = file_status(file_type::status_error); 703288943Sdim return mapWindowsError(LastError); 704261991Sdim} 705218885Sdim 706321369Sdimstd::error_code status(const Twine &path, file_status &result, bool Follow) { 707261991Sdim SmallString<128> path_storage; 708261991Sdim SmallVector<wchar_t, 128> path_utf16; 709261991Sdim 710261991Sdim StringRef path8 = path.toStringRef(path_storage); 711261991Sdim if (isReservedName(path8)) { 712261991Sdim result = file_status(file_type::character_file); 713276479Sdim return std::error_code(); 714218885Sdim } 715218885Sdim 716280031Sdim if (std::error_code ec = widenPath(path8, path_utf16)) 717261991Sdim return ec; 718218885Sdim 719261991Sdim DWORD attr = ::GetFileAttributesW(path_utf16.begin()); 720261991Sdim if (attr == INVALID_FILE_ATTRIBUTES) 721261991Sdim return getStatus(INVALID_HANDLE_VALUE, result); 722261991Sdim 723321369Sdim DWORD Flags = FILE_FLAG_BACKUP_SEMANTICS; 724261991Sdim // Handle reparse points. 725321369Sdim if (!Follow && (attr & FILE_ATTRIBUTE_REPARSE_POINT)) 726321369Sdim Flags |= FILE_FLAG_OPEN_REPARSE_POINT; 727261991Sdim 728261991Sdim ScopedFileHandle h( 729261991Sdim ::CreateFileW(path_utf16.begin(), 0, // Attributes only. 730261991Sdim FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE, 731321369Sdim NULL, OPEN_EXISTING, Flags, 0)); 732321369Sdim if (!h) 733321369Sdim return getStatus(INVALID_HANDLE_VALUE, result); 734261991Sdim 735321369Sdim return getStatus(h, result); 736218885Sdim} 737218885Sdim 738276479Sdimstd::error_code status(int FD, file_status &Result) { 739261991Sdim HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 740261991Sdim return getStatus(FileHandle, Result); 741261991Sdim} 742261991Sdim 743353358Sdimstd::error_code status(file_t FileHandle, file_status &Result) { 744353358Sdim return getStatus(FileHandle, Result); 745353358Sdim} 746353358Sdim 747353358Sdimunsigned getUmask() { 748353358Sdim return 0; 749353358Sdim} 750353358Sdim 751321369Sdimstd::error_code setPermissions(const Twine &Path, perms Permissions) { 752321369Sdim SmallVector<wchar_t, 128> PathUTF16; 753321369Sdim if (std::error_code EC = widenPath(Path, PathUTF16)) 754321369Sdim return EC; 755321369Sdim 756321369Sdim DWORD Attributes = ::GetFileAttributesW(PathUTF16.begin()); 757321369Sdim if (Attributes == INVALID_FILE_ATTRIBUTES) 758321369Sdim return mapWindowsError(GetLastError()); 759321369Sdim 760321369Sdim // There are many Windows file attributes that are not to do with the file 761321369Sdim // permissions (e.g. FILE_ATTRIBUTE_HIDDEN). We need to be careful to preserve 762321369Sdim // them. 763321369Sdim if (Permissions & all_write) { 764321369Sdim Attributes &= ~FILE_ATTRIBUTE_READONLY; 765321369Sdim if (Attributes == 0) 766321369Sdim // FILE_ATTRIBUTE_NORMAL indicates no other attributes are set. 767321369Sdim Attributes |= FILE_ATTRIBUTE_NORMAL; 768321369Sdim } 769321369Sdim else { 770321369Sdim Attributes |= FILE_ATTRIBUTE_READONLY; 771321369Sdim // FILE_ATTRIBUTE_NORMAL is not compatible with any other attributes, so 772321369Sdim // remove it, if it is present. 773321369Sdim Attributes &= ~FILE_ATTRIBUTE_NORMAL; 774321369Sdim } 775321369Sdim 776321369Sdim if (!::SetFileAttributesW(PathUTF16.begin(), Attributes)) 777321369Sdim return mapWindowsError(GetLastError()); 778321369Sdim 779321369Sdim return std::error_code(); 780321369Sdim} 781321369Sdim 782353358Sdimstd::error_code setPermissions(int FD, perms Permissions) { 783353358Sdim // FIXME Not implemented. 784353358Sdim return std::make_error_code(std::errc::not_supported); 785353358Sdim} 786353358Sdim 787344779Sdimstd::error_code setLastAccessAndModificationTime(int FD, TimePoint<> AccessTime, 788344779Sdim TimePoint<> ModificationTime) { 789344779Sdim FILETIME AccessFT = toFILETIME(AccessTime); 790344779Sdim FILETIME ModifyFT = toFILETIME(ModificationTime); 791261991Sdim HANDLE FileHandle = reinterpret_cast<HANDLE>(_get_osfhandle(FD)); 792344779Sdim if (!SetFileTime(FileHandle, NULL, &AccessFT, &ModifyFT)) 793288943Sdim return mapWindowsError(::GetLastError()); 794276479Sdim return std::error_code(); 795261991Sdim} 796261991Sdim 797353358Sdimstd::error_code mapped_file_region::init(sys::fs::file_t OrigFileHandle, 798353358Sdim uint64_t Offset, mapmode Mode) { 799341825Sdim this->Mode = Mode; 800341825Sdim if (OrigFileHandle == INVALID_HANDLE_VALUE) 801280031Sdim return make_error_code(errc::bad_file_descriptor); 802280031Sdim 803261991Sdim DWORD flprotect; 804261991Sdim switch (Mode) { 805261991Sdim case readonly: flprotect = PAGE_READONLY; break; 806261991Sdim case readwrite: flprotect = PAGE_READWRITE; break; 807261991Sdim case priv: flprotect = PAGE_WRITECOPY; break; 808218885Sdim } 809218885Sdim 810280031Sdim HANDLE FileMappingHandle = 811341825Sdim ::CreateFileMappingW(OrigFileHandle, 0, flprotect, 812327952Sdim Hi_32(Size), 813327952Sdim Lo_32(Size), 814261991Sdim 0); 815261991Sdim if (FileMappingHandle == NULL) { 816288943Sdim std::error_code ec = mapWindowsError(GetLastError()); 817261991Sdim return ec; 818218885Sdim } 819218885Sdim 820261991Sdim DWORD dwDesiredAccess; 821261991Sdim switch (Mode) { 822261991Sdim case readonly: dwDesiredAccess = FILE_MAP_READ; break; 823261991Sdim case readwrite: dwDesiredAccess = FILE_MAP_WRITE; break; 824261991Sdim case priv: dwDesiredAccess = FILE_MAP_COPY; break; 825261991Sdim } 826261991Sdim Mapping = ::MapViewOfFile(FileMappingHandle, 827261991Sdim dwDesiredAccess, 828261991Sdim Offset >> 32, 829261991Sdim Offset & 0xffffffff, 830261991Sdim Size); 831261991Sdim if (Mapping == NULL) { 832288943Sdim std::error_code ec = mapWindowsError(GetLastError()); 833261991Sdim ::CloseHandle(FileMappingHandle); 834261991Sdim return ec; 835261991Sdim } 836261991Sdim 837261991Sdim if (Size == 0) { 838261991Sdim MEMORY_BASIC_INFORMATION mbi; 839261991Sdim SIZE_T Result = VirtualQuery(Mapping, &mbi, sizeof(mbi)); 840261991Sdim if (Result == 0) { 841288943Sdim std::error_code ec = mapWindowsError(GetLastError()); 842261991Sdim ::UnmapViewOfFile(Mapping); 843261991Sdim ::CloseHandle(FileMappingHandle); 844261991Sdim return ec; 845218885Sdim } 846261991Sdim Size = mbi.RegionSize; 847218885Sdim } 848218885Sdim 849341825Sdim // Close the file mapping handle, as it's kept alive by the file mapping. But 850341825Sdim // neither the file mapping nor the file mapping handle keep the file handle 851341825Sdim // alive, so we need to keep a reference to the file in case all other handles 852341825Sdim // are closed and the file is deleted, which may cause invalid data to be read 853341825Sdim // from the file. 854261991Sdim ::CloseHandle(FileMappingHandle); 855341825Sdim if (!::DuplicateHandle(::GetCurrentProcess(), OrigFileHandle, 856341825Sdim ::GetCurrentProcess(), &FileHandle, 0, 0, 857341825Sdim DUPLICATE_SAME_ACCESS)) { 858341825Sdim std::error_code ec = mapWindowsError(GetLastError()); 859341825Sdim ::UnmapViewOfFile(Mapping); 860341825Sdim return ec; 861341825Sdim } 862341825Sdim 863276479Sdim return std::error_code(); 864218885Sdim} 865218885Sdim 866353358Sdimmapped_file_region::mapped_file_region(sys::fs::file_t fd, mapmode mode, 867353358Sdim size_t length, uint64_t offset, 868353358Sdim std::error_code &ec) 869280031Sdim : Size(length), Mapping() { 870280031Sdim ec = init(fd, offset, mode); 871280031Sdim if (ec) 872280031Sdim Mapping = 0; 873261991Sdim} 874218885Sdim 875344779Sdimstatic bool hasFlushBufferKernelBug() { 876344779Sdim static bool Ret{GetWindowsOSVersion() < llvm::VersionTuple(10, 0, 0, 17763)}; 877344779Sdim return Ret; 878344779Sdim} 879344779Sdim 880344779Sdimstatic bool isEXE(StringRef Magic) { 881344779Sdim static const char PEMagic[] = {'P', 'E', '\0', '\0'}; 882344779Sdim if (Magic.startswith(StringRef("MZ")) && Magic.size() >= 0x3c + 4) { 883344779Sdim uint32_t off = read32le(Magic.data() + 0x3c); 884344779Sdim // PE/COFF file, either EXE or DLL. 885344779Sdim if (Magic.substr(off).startswith(StringRef(PEMagic, sizeof(PEMagic)))) 886344779Sdim return true; 887344779Sdim } 888344779Sdim return false; 889344779Sdim} 890344779Sdim 891261991Sdimmapped_file_region::~mapped_file_region() { 892341825Sdim if (Mapping) { 893344779Sdim 894344779Sdim bool Exe = isEXE(StringRef((char *)Mapping, Size)); 895344779Sdim 896261991Sdim ::UnmapViewOfFile(Mapping); 897341825Sdim 898344779Sdim if (Mode == mapmode::readwrite && Exe && hasFlushBufferKernelBug()) { 899341825Sdim // There is a Windows kernel bug, the exact trigger conditions of which 900341825Sdim // are not well understood. When triggered, dirty pages are not properly 901341825Sdim // flushed and subsequent process's attempts to read a file can return 902341825Sdim // invalid data. Calling FlushFileBuffers on the write handle is 903341825Sdim // sufficient to ensure that this bug is not triggered. 904344779Sdim // The bug only occurs when writing an executable and executing it right 905344779Sdim // after, under high I/O pressure. 906341825Sdim ::FlushFileBuffers(FileHandle); 907341825Sdim } 908341825Sdim 909341825Sdim ::CloseHandle(FileHandle); 910341825Sdim } 911261991Sdim} 912218885Sdim 913327952Sdimsize_t mapped_file_region::size() const { 914261991Sdim assert(Mapping && "Mapping failed but used anyway!"); 915261991Sdim return Size; 916261991Sdim} 917218885Sdim 918261991Sdimchar *mapped_file_region::data() const { 919261991Sdim assert(Mapping && "Mapping failed but used anyway!"); 920261991Sdim return reinterpret_cast<char*>(Mapping); 921261991Sdim} 922218885Sdim 923261991Sdimconst char *mapped_file_region::const_data() const { 924261991Sdim assert(Mapping && "Mapping failed but used anyway!"); 925261991Sdim return reinterpret_cast<const char*>(Mapping); 926261991Sdim} 927218885Sdim 928261991Sdimint mapped_file_region::alignment() { 929261991Sdim SYSTEM_INFO SysInfo; 930261991Sdim ::GetSystemInfo(&SysInfo); 931261991Sdim return SysInfo.dwAllocationGranularity; 932261991Sdim} 933218885Sdim 934327952Sdimstatic basic_file_status status_from_find_data(WIN32_FIND_DATAW *FindData) { 935327952Sdim return basic_file_status(file_type_from_attrs(FindData->dwFileAttributes), 936327952Sdim perms_from_attrs(FindData->dwFileAttributes), 937327952Sdim FindData->ftLastAccessTime.dwHighDateTime, 938327952Sdim FindData->ftLastAccessTime.dwLowDateTime, 939327952Sdim FindData->ftLastWriteTime.dwHighDateTime, 940327952Sdim FindData->ftLastWriteTime.dwLowDateTime, 941327952Sdim FindData->nFileSizeHigh, FindData->nFileSizeLow); 942327952Sdim} 943327952Sdim 944344779Sdimstd::error_code detail::directory_iterator_construct(detail::DirIterState &IT, 945344779Sdim StringRef Path, 946344779Sdim bool FollowSymlinks) { 947344779Sdim SmallVector<wchar_t, 128> PathUTF16; 948218885Sdim 949344779Sdim if (std::error_code EC = widenPath(Path, PathUTF16)) 950344779Sdim return EC; 951218885Sdim 952261991Sdim // Convert path to the format that Windows is happy with. 953344779Sdim if (PathUTF16.size() > 0 && 954344779Sdim !is_separator(PathUTF16[Path.size() - 1]) && 955344779Sdim PathUTF16[Path.size() - 1] != L':') { 956344779Sdim PathUTF16.push_back(L'\\'); 957344779Sdim PathUTF16.push_back(L'*'); 958261991Sdim } else { 959344779Sdim PathUTF16.push_back(L'*'); 960261991Sdim } 961218885Sdim 962261991Sdim // Get the first directory entry. 963261991Sdim WIN32_FIND_DATAW FirstFind; 964327952Sdim ScopedFindHandle FindHandle(::FindFirstFileExW( 965344779Sdim c_str(PathUTF16), FindExInfoBasic, &FirstFind, FindExSearchNameMatch, 966327952Sdim NULL, FIND_FIRST_EX_LARGE_FETCH)); 967261991Sdim if (!FindHandle) 968288943Sdim return mapWindowsError(::GetLastError()); 969218885Sdim 970261991Sdim size_t FilenameLen = ::wcslen(FirstFind.cFileName); 971261991Sdim while ((FilenameLen == 1 && FirstFind.cFileName[0] == L'.') || 972261991Sdim (FilenameLen == 2 && FirstFind.cFileName[0] == L'.' && 973261991Sdim FirstFind.cFileName[1] == L'.')) 974261991Sdim if (!::FindNextFileW(FindHandle, &FirstFind)) { 975276479Sdim DWORD LastError = ::GetLastError(); 976261991Sdim // Check for end. 977276479Sdim if (LastError == ERROR_NO_MORE_FILES) 978344779Sdim return detail::directory_iterator_destruct(IT); 979288943Sdim return mapWindowsError(LastError); 980261991Sdim } else 981261991Sdim FilenameLen = ::wcslen(FirstFind.cFileName); 982218885Sdim 983261991Sdim // Construct the current directory entry. 984344779Sdim SmallString<128> DirectoryEntryNameUTF8; 985344779Sdim if (std::error_code EC = 986276479Sdim UTF16ToUTF8(FirstFind.cFileName, ::wcslen(FirstFind.cFileName), 987344779Sdim DirectoryEntryNameUTF8)) 988344779Sdim return EC; 989218885Sdim 990344779Sdim IT.IterationHandle = intptr_t(FindHandle.take()); 991344779Sdim SmallString<128> DirectoryEntryPath(Path); 992344779Sdim path::append(DirectoryEntryPath, DirectoryEntryNameUTF8); 993344779Sdim IT.CurrentEntry = 994344779Sdim directory_entry(DirectoryEntryPath, FollowSymlinks, 995344779Sdim file_type_from_attrs(FirstFind.dwFileAttributes), 996344779Sdim status_from_find_data(&FirstFind)); 997218885Sdim 998276479Sdim return std::error_code(); 999218885Sdim} 1000218885Sdim 1001344779Sdimstd::error_code detail::directory_iterator_destruct(detail::DirIterState &IT) { 1002344779Sdim if (IT.IterationHandle != 0) 1003261991Sdim // Closes the handle if it's valid. 1004344779Sdim ScopedFindHandle close(HANDLE(IT.IterationHandle)); 1005344779Sdim IT.IterationHandle = 0; 1006344779Sdim IT.CurrentEntry = directory_entry(); 1007276479Sdim return std::error_code(); 1008261991Sdim} 1009218885Sdim 1010344779Sdimstd::error_code detail::directory_iterator_increment(detail::DirIterState &IT) { 1011261991Sdim WIN32_FIND_DATAW FindData; 1012344779Sdim if (!::FindNextFileW(HANDLE(IT.IterationHandle), &FindData)) { 1013276479Sdim DWORD LastError = ::GetLastError(); 1014261991Sdim // Check for end. 1015276479Sdim if (LastError == ERROR_NO_MORE_FILES) 1016344779Sdim return detail::directory_iterator_destruct(IT); 1017288943Sdim return mapWindowsError(LastError); 1018261991Sdim } 1019218885Sdim 1020261991Sdim size_t FilenameLen = ::wcslen(FindData.cFileName); 1021261991Sdim if ((FilenameLen == 1 && FindData.cFileName[0] == L'.') || 1022261991Sdim (FilenameLen == 2 && FindData.cFileName[0] == L'.' && 1023261991Sdim FindData.cFileName[1] == L'.')) 1024344779Sdim return directory_iterator_increment(IT); 1025218885Sdim 1026344779Sdim SmallString<128> DirectoryEntryPathUTF8; 1027344779Sdim if (std::error_code EC = 1028276479Sdim UTF16ToUTF8(FindData.cFileName, ::wcslen(FindData.cFileName), 1029344779Sdim DirectoryEntryPathUTF8)) 1030344779Sdim return EC; 1031218885Sdim 1032344779Sdim IT.CurrentEntry.replace_filename( 1033344779Sdim Twine(DirectoryEntryPathUTF8), 1034344779Sdim file_type_from_attrs(FindData.dwFileAttributes), 1035344779Sdim status_from_find_data(&FindData)); 1036276479Sdim return std::error_code(); 1037218885Sdim} 1038218885Sdim 1039327952SdimErrorOr<basic_file_status> directory_entry::status() const { 1040327952Sdim return Status; 1041321369Sdim} 1042321369Sdim 1043341825Sdimstatic std::error_code nativeFileToFd(Expected<HANDLE> H, int &ResultFD, 1044341825Sdim OpenFlags Flags) { 1045341825Sdim int CrtOpenFlags = 0; 1046341825Sdim if (Flags & OF_Append) 1047341825Sdim CrtOpenFlags |= _O_APPEND; 1048321369Sdim 1049341825Sdim if (Flags & OF_Text) 1050341825Sdim CrtOpenFlags |= _O_TEXT; 1051321369Sdim 1052341825Sdim ResultFD = -1; 1053341825Sdim if (!H) 1054341825Sdim return errorToErrorCode(H.takeError()); 1055341825Sdim 1056341825Sdim ResultFD = ::_open_osfhandle(intptr_t(*H), CrtOpenFlags); 1057341825Sdim if (ResultFD == -1) { 1058341825Sdim ::CloseHandle(*H); 1059341825Sdim return mapWindowsError(ERROR_INVALID_HANDLE); 1060341825Sdim } 1061341825Sdim return std::error_code(); 1062321369Sdim} 1063321369Sdim 1064341825Sdimstatic DWORD nativeDisposition(CreationDisposition Disp, OpenFlags Flags) { 1065341825Sdim // This is a compatibility hack. Really we should respect the creation 1066341825Sdim // disposition, but a lot of old code relied on the implicit assumption that 1067341825Sdim // OF_Append implied it would open an existing file. Since the disposition is 1068341825Sdim // now explicit and defaults to CD_CreateAlways, this assumption would cause 1069341825Sdim // any usage of OF_Append to append to a new file, even if the file already 1070341825Sdim // existed. A better solution might have two new creation dispositions: 1071341825Sdim // CD_AppendAlways and CD_AppendNew. This would also address the problem of 1072341825Sdim // OF_Append being used on a read-only descriptor, which doesn't make sense. 1073341825Sdim if (Flags & OF_Append) 1074341825Sdim return OPEN_ALWAYS; 1075341825Sdim 1076341825Sdim switch (Disp) { 1077341825Sdim case CD_CreateAlways: 1078341825Sdim return CREATE_ALWAYS; 1079341825Sdim case CD_CreateNew: 1080341825Sdim return CREATE_NEW; 1081341825Sdim case CD_OpenAlways: 1082341825Sdim return OPEN_ALWAYS; 1083341825Sdim case CD_OpenExisting: 1084341825Sdim return OPEN_EXISTING; 1085341825Sdim } 1086341825Sdim llvm_unreachable("unreachable!"); 1087341825Sdim} 1088341825Sdim 1089341825Sdimstatic DWORD nativeAccess(FileAccess Access, OpenFlags Flags) { 1090341825Sdim DWORD Result = 0; 1091341825Sdim if (Access & FA_Read) 1092341825Sdim Result |= GENERIC_READ; 1093341825Sdim if (Access & FA_Write) 1094341825Sdim Result |= GENERIC_WRITE; 1095341825Sdim if (Flags & OF_Delete) 1096341825Sdim Result |= DELETE; 1097341825Sdim if (Flags & OF_UpdateAtime) 1098341825Sdim Result |= FILE_WRITE_ATTRIBUTES; 1099341825Sdim return Result; 1100341825Sdim} 1101341825Sdim 1102341825Sdimstatic std::error_code openNativeFileInternal(const Twine &Name, 1103341825Sdim file_t &ResultFile, DWORD Disp, 1104341825Sdim DWORD Access, DWORD Flags, 1105341825Sdim bool Inherit = false) { 1106261991Sdim SmallVector<wchar_t, 128> PathUTF16; 1107280031Sdim if (std::error_code EC = widenPath(Name, PathUTF16)) 1108261991Sdim return EC; 1109218885Sdim 1110341825Sdim SECURITY_ATTRIBUTES SA; 1111341825Sdim SA.nLength = sizeof(SA); 1112341825Sdim SA.lpSecurityDescriptor = nullptr; 1113341825Sdim SA.bInheritHandle = Inherit; 1114341825Sdim 1115296417Sdim HANDLE H = 1116341825Sdim ::CreateFileW(PathUTF16.begin(), Access, 1117341825Sdim FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, &SA, 1118341825Sdim Disp, Flags, NULL); 1119261991Sdim if (H == INVALID_HANDLE_VALUE) { 1120276479Sdim DWORD LastError = ::GetLastError(); 1121288943Sdim std::error_code EC = mapWindowsError(LastError); 1122261991Sdim // Provide a better error message when trying to open directories. 1123261991Sdim // This only runs if we failed to open the file, so there is probably 1124261991Sdim // no performances issues. 1125276479Sdim if (LastError != ERROR_ACCESS_DENIED) 1126261991Sdim return EC; 1127261991Sdim if (is_directory(Name)) 1128276479Sdim return make_error_code(errc::is_a_directory); 1129261991Sdim return EC; 1130218885Sdim } 1131341825Sdim ResultFile = H; 1132276479Sdim return std::error_code(); 1133218885Sdim} 1134218885Sdim 1135341825SdimExpectedopenNativeFile(const Twine &Name, CreationDisposition Disp, 1136341825Sdim FileAccess Access, OpenFlags Flags, 1137341825Sdim unsigned Mode) { 1138261991Sdim // Verify that we don't have both "append" and "excl". 1139341825Sdim assert((!(Disp == CD_CreateNew) || !(Flags & OF_Append)) && 1140341825Sdim "Cannot specify both 'CreateNew' and 'Append' file creation flags!"); 1141218885Sdim 1142341825Sdim DWORD NativeDisp = nativeDisposition(Disp, Flags); 1143341825Sdim DWORD NativeAccess = nativeAccess(Access, Flags); 1144218885Sdim 1145341825Sdim bool Inherit = false; 1146341825Sdim if (Flags & OF_ChildInherit) 1147341825Sdim Inherit = true; 1148218885Sdim 1149341825Sdim file_t Result; 1150341825Sdim std::error_code EC = openNativeFileInternal( 1151341825Sdim Name, Result, NativeDisp, NativeAccess, FILE_ATTRIBUTE_NORMAL, Inherit); 1152341825Sdim if (EC) 1153341825Sdim return errorCodeToError(EC); 1154261991Sdim 1155341825Sdim if (Flags & OF_UpdateAtime) { 1156341825Sdim FILETIME FileTime; 1157341825Sdim SYSTEMTIME SystemTime; 1158341825Sdim GetSystemTime(&SystemTime); 1159341825Sdim if (SystemTimeToFileTime(&SystemTime, &FileTime) == 0 || 1160341825Sdim SetFileTime(Result, NULL, &FileTime, NULL) == 0) { 1161341825Sdim DWORD LastError = ::GetLastError(); 1162341825Sdim ::CloseHandle(Result); 1163341825Sdim return errorCodeToError(mapWindowsError(LastError)); 1164341825Sdim } 1165327952Sdim } 1166276479Sdim 1167341825Sdim if (Flags & OF_Delete) { 1168341825Sdim if ((EC = setDeleteDisposition(Result, true))) { 1169341825Sdim ::CloseHandle(Result); 1170341825Sdim return errorCodeToError(EC); 1171341825Sdim } 1172341825Sdim } 1173341825Sdim return Result; 1174341825Sdim} 1175261991Sdim 1176341825Sdimstd::error_code openFile(const Twine &Name, int &ResultFD, 1177341825Sdim CreationDisposition Disp, FileAccess Access, 1178341825Sdim OpenFlags Flags, unsigned int Mode) { 1179341825Sdim Expected<file_t> Result = openNativeFile(Name, Disp, Access, Flags); 1180341825Sdim if (!Result) 1181341825Sdim return errorToErrorCode(Result.takeError()); 1182341825Sdim 1183341825Sdim return nativeFileToFd(*Result, ResultFD, Flags); 1184341825Sdim} 1185341825Sdim 1186341825Sdimstatic std::error_code directoryRealPath(const Twine &Name, 1187341825Sdim SmallVectorImpl<char> &RealPath) { 1188341825Sdim file_t File; 1189341825Sdim std::error_code EC = openNativeFileInternal( 1190341825Sdim Name, File, OPEN_EXISTING, GENERIC_READ, FILE_FLAG_BACKUP_SEMANTICS); 1191341825Sdim if (EC) 1192261991Sdim return EC; 1193218885Sdim 1194341825Sdim EC = realPathFromHandle(File, RealPath); 1195341825Sdim ::CloseHandle(File); 1196341825Sdim return EC; 1197341825Sdim} 1198218885Sdim 1199341825Sdimstd::error_code openFileForRead(const Twine &Name, int &ResultFD, 1200341825Sdim OpenFlags Flags, 1201341825Sdim SmallVectorImpl<char> *RealPath) { 1202341825Sdim Expected<HANDLE> NativeFile = openNativeFileForRead(Name, Flags, RealPath); 1203341825Sdim return nativeFileToFd(std::move(NativeFile), ResultFD, OF_None); 1204341825Sdim} 1205218885Sdim 1206341825SdimExpected<file_t> openNativeFileForRead(const Twine &Name, OpenFlags Flags, 1207341825Sdim SmallVectorImpl<char> *RealPath) { 1208341825Sdim Expected<file_t> Result = 1209341825Sdim openNativeFile(Name, CD_OpenExisting, FA_Read, Flags); 1210218885Sdim 1211341825Sdim // Fetch the real name of the file, if the user asked 1212341825Sdim if (Result && RealPath) 1213341825Sdim realPathFromHandle(*Result, *RealPath); 1214341825Sdim 1215341825Sdim return Result; 1216218885Sdim} 1217309124Sdim 1218353358Sdimfile_t convertFDToNativeFile(int FD) { 1219353358Sdim return reinterpret_cast<HANDLE>(::_get_osfhandle(FD)); 1220353358Sdim} 1221353358Sdim 1222353358Sdimfile_t getStdinHandle() { return ::GetStdHandle(STD_INPUT_HANDLE); } 1223353358Sdimfile_t getStdoutHandle() { return ::GetStdHandle(STD_OUTPUT_HANDLE); } 1224353358Sdimfile_t getStderrHandle() { return ::GetStdHandle(STD_ERROR_HANDLE); } 1225353358Sdim 1226360784SdimExpected<size_t> readNativeFileImpl(file_t FileHandle, 1227360784Sdim MutableArrayRef<char> Buf, 1228360784Sdim OVERLAPPED *Overlap) { 1229353358Sdim // ReadFile can only read 2GB at a time. The caller should check the number of 1230353358Sdim // bytes and read in a loop until termination. 1231360784Sdim DWORD BytesToRead = 1232360784Sdim std::min(size_t(std::numeric_limits<DWORD>::max()), Buf.size()); 1233360784Sdim DWORD BytesRead = 0; 1234360784Sdim if (::ReadFile(FileHandle, Buf.data(), BytesToRead, &BytesRead, Overlap)) 1235360784Sdim return BytesRead; 1236360784Sdim DWORD Err = ::GetLastError(); 1237360784Sdim // EOF is not an error. 1238360784Sdim if (Err == ERROR_BROKEN_PIPE || Err == ERROR_HANDLE_EOF) 1239360784Sdim return BytesRead; 1240360784Sdim return errorCodeToError(mapWindowsError(Err)); 1241353358Sdim} 1242353358Sdim 1243360784SdimExpected<size_t> readNativeFile(file_t FileHandle, MutableArrayRef<char> Buf) { 1244360784Sdim return readNativeFileImpl(FileHandle, Buf, /*Overlap=*/nullptr); 1245353358Sdim} 1246353358Sdim 1247360784SdimExpected<size_t> readNativeFileSlice(file_t FileHandle, 1248360784Sdim MutableArrayRef<char> Buf, 1249360784Sdim uint64_t Offset) { 1250360784Sdim OVERLAPPED Overlapped = {}; 1251360784Sdim Overlapped.Offset = uint32_t(Offset); 1252360784Sdim Overlapped.OffsetHigh = uint32_t(Offset >> 32); 1253360784Sdim return readNativeFileImpl(FileHandle, Buf, &Overlapped); 1254353358Sdim} 1255353358Sdim 1256353358Sdimstd::error_code closeFile(file_t &F) { 1257353358Sdim file_t TmpF = F; 1258341825Sdim F = kInvalidFile; 1259353358Sdim if (!::CloseHandle(TmpF)) 1260353358Sdim return mapWindowsError(::GetLastError()); 1261353358Sdim return std::error_code(); 1262341825Sdim} 1263341825Sdim 1264321369Sdimstd::error_code remove_directories(const Twine &path, bool IgnoreErrors) { 1265321369Sdim // Convert to utf-16. 1266321369Sdim SmallVector<wchar_t, 128> Path16; 1267321369Sdim std::error_code EC = widenPath(path, Path16); 1268321369Sdim if (EC && !IgnoreErrors) 1269321369Sdim return EC; 1270321369Sdim 1271321369Sdim // SHFileOperation() accepts a list of paths, and so must be double null- 1272321369Sdim // terminated to indicate the end of the list. The buffer is already null 1273321369Sdim // terminated, but since that null character is not considered part of the 1274321369Sdim // vector's size, pushing another one will just consume that byte. So we 1275321369Sdim // need to push 2 null terminators. 1276321369Sdim Path16.push_back(0); 1277321369Sdim Path16.push_back(0); 1278321369Sdim 1279321369Sdim SHFILEOPSTRUCTW shfos = {}; 1280321369Sdim shfos.wFunc = FO_DELETE; 1281321369Sdim shfos.pFrom = Path16.data(); 1282321369Sdim shfos.fFlags = FOF_NO_UI; 1283321369Sdim 1284321369Sdim int result = ::SHFileOperationW(&shfos); 1285321369Sdim if (result != 0 && !IgnoreErrors) 1286321369Sdim return mapWindowsError(result); 1287321369Sdim return std::error_code(); 1288321369Sdim} 1289321369Sdim 1290321369Sdimstatic void expandTildeExpr(SmallVectorImpl<char> &Path) { 1291321369Sdim // Path does not begin with a tilde expression. 1292321369Sdim if (Path.empty() || Path[0] != '~') 1293321369Sdim return; 1294321369Sdim 1295321369Sdim StringRef PathStr(Path.begin(), Path.size()); 1296321369Sdim PathStr = PathStr.drop_front(); 1297321369Sdim StringRef Expr = PathStr.take_until([](char c) { return path::is_separator(c); }); 1298321369Sdim 1299321369Sdim if (!Expr.empty()) { 1300321369Sdim // This is probably a ~username/ expression. Don't support this on Windows. 1301321369Sdim return; 1302321369Sdim } 1303321369Sdim 1304321369Sdim SmallString<128> HomeDir; 1305321369Sdim if (!path::home_directory(HomeDir)) { 1306321369Sdim // For some reason we couldn't get the home directory. Just exit. 1307321369Sdim return; 1308321369Sdim } 1309321369Sdim 1310321369Sdim // Overwrite the first character and insert the rest. 1311321369Sdim Path[0] = HomeDir[0]; 1312321369Sdim Path.insert(Path.begin() + 1, HomeDir.begin() + 1, HomeDir.end()); 1313321369Sdim} 1314321369Sdim 1315344779Sdimvoid expand_tilde(const Twine &path, SmallVectorImpl<char> &dest) { 1316344779Sdim dest.clear(); 1317344779Sdim if (path.isTriviallyEmpty()) 1318344779Sdim return; 1319344779Sdim 1320344779Sdim path.toVector(dest); 1321344779Sdim expandTildeExpr(dest); 1322344779Sdim 1323344779Sdim return; 1324344779Sdim} 1325344779Sdim 1326321369Sdimstd::error_code real_path(const Twine &path, SmallVectorImpl<char> &dest, 1327321369Sdim bool expand_tilde) { 1328321369Sdim dest.clear(); 1329321369Sdim if (path.isTriviallyEmpty()) 1330321369Sdim return std::error_code(); 1331321369Sdim 1332321369Sdim if (expand_tilde) { 1333321369Sdim SmallString<128> Storage; 1334321369Sdim path.toVector(Storage); 1335321369Sdim expandTildeExpr(Storage); 1336321369Sdim return real_path(Storage, dest, false); 1337321369Sdim } 1338321369Sdim 1339321369Sdim if (is_directory(path)) 1340321369Sdim return directoryRealPath(path, dest); 1341321369Sdim 1342321369Sdim int fd; 1343341825Sdim if (std::error_code EC = 1344341825Sdim llvm::sys::fs::openFileForRead(path, fd, OF_None, &dest)) 1345321369Sdim return EC; 1346321369Sdim ::close(fd); 1347321369Sdim return std::error_code(); 1348321369Sdim} 1349321369Sdim 1350261991Sdim} // end namespace fs 1351218885Sdim 1352276479Sdimnamespace path { 1353296417Sdimstatic bool getKnownFolderPath(KNOWNFOLDERID folderId, 1354296417Sdim SmallVectorImpl<char> &result) { 1355296417Sdim wchar_t *path = nullptr; 1356296417Sdim if (::SHGetKnownFolderPath(folderId, KF_FLAG_CREATE, nullptr, &path) != S_OK) 1357276479Sdim return false; 1358276479Sdim 1359296417Sdim bool ok = !UTF16ToUTF8(path, ::wcslen(path), result); 1360296417Sdim ::CoTaskMemFree(path); 1361296417Sdim return ok; 1362296417Sdim} 1363276479Sdim 1364296417Sdimbool home_directory(SmallVectorImpl<char> &result) { 1365296417Sdim return getKnownFolderPath(FOLDERID_Profile, result); 1366296417Sdim} 1367280031Sdim 1368296417Sdimstatic bool getTempDirEnvVar(const wchar_t *Var, SmallVectorImpl<char> &Res) { 1369280031Sdim SmallVector<wchar_t, 1024> Buf; 1370280031Sdim size_t Size = 1024; 1371280031Sdim do { 1372280031Sdim Buf.reserve(Size); 1373296417Sdim Size = GetEnvironmentVariableW(Var, Buf.data(), Buf.capacity()); 1374280031Sdim if (Size == 0) 1375280031Sdim return false; 1376280031Sdim 1377280031Sdim // Try again with larger buffer. 1378280031Sdim } while (Size > Buf.capacity()); 1379280031Sdim Buf.set_size(Size); 1380280031Sdim 1381296417Sdim return !windows::UTF16ToUTF8(Buf.data(), Size, Res); 1382280031Sdim} 1383280031Sdim 1384280031Sdimstatic bool getTempDirEnvVar(SmallVectorImpl<char> &Res) { 1385296417Sdim const wchar_t *EnvironmentVariables[] = {L"TMP", L"TEMP", L"USERPROFILE"}; 1386296417Sdim for (auto *Env : EnvironmentVariables) { 1387280031Sdim if (getTempDirEnvVar(Env, Res)) 1388280031Sdim return true; 1389280031Sdim } 1390280031Sdim return false; 1391280031Sdim} 1392280031Sdim 1393280031Sdimvoid system_temp_directory(bool ErasedOnReboot, SmallVectorImpl<char> &Result) { 1394280031Sdim (void)ErasedOnReboot; 1395280031Sdim Result.clear(); 1396280031Sdim 1397296417Sdim // Check whether the temporary directory is specified by an environment var. 1398296417Sdim // This matches GetTempPath logic to some degree. GetTempPath is not used 1399296417Sdim // directly as it cannot handle evn var longer than 130 chars on Windows 7 1400296417Sdim // (fixed on Windows 8). 1401296417Sdim if (getTempDirEnvVar(Result)) { 1402296417Sdim assert(!Result.empty() && "Unexpected empty path"); 1403296417Sdim native(Result); // Some Unix-like shells use Unix path separator in $TMP. 1404296417Sdim fs::make_absolute(Result); // Make it absolute if not already. 1405280031Sdim return; 1406296417Sdim } 1407280031Sdim 1408280031Sdim // Fall back to a system default. 1409296417Sdim const char *DefaultResult = "C:\\Temp"; 1410280031Sdim Result.append(DefaultResult, DefaultResult + strlen(DefaultResult)); 1411280031Sdim} 1412276479Sdim} // end namespace path 1413276479Sdim 1414261991Sdimnamespace windows { 1415341825Sdimstd::error_code CodePageToUTF16(unsigned codepage, 1416341825Sdim llvm::StringRef original, 1417341825Sdim llvm::SmallVectorImpl<wchar_t> &utf16) { 1418341825Sdim if (!original.empty()) { 1419341825Sdim int len = ::MultiByteToWideChar(codepage, MB_ERR_INVALID_CHARS, original.begin(), 1420341825Sdim original.size(), utf16.begin(), 0); 1421261991Sdim 1422341825Sdim if (len == 0) { 1423288943Sdim return mapWindowsError(::GetLastError()); 1424341825Sdim } 1425261991Sdim 1426276479Sdim utf16.reserve(len + 1); 1427276479Sdim utf16.set_size(len); 1428261991Sdim 1429341825Sdim len = ::MultiByteToWideChar(codepage, MB_ERR_INVALID_CHARS, original.begin(), 1430341825Sdim original.size(), utf16.begin(), utf16.size()); 1431261991Sdim 1432341825Sdim if (len == 0) { 1433288943Sdim return mapWindowsError(::GetLastError()); 1434341825Sdim } 1435276479Sdim } 1436261991Sdim 1437261991Sdim // Make utf16 null terminated. 1438261991Sdim utf16.push_back(0); 1439261991Sdim utf16.pop_back(); 1440261991Sdim 1441276479Sdim return std::error_code(); 1442218885Sdim} 1443218885Sdim 1444341825Sdimstd::error_code UTF8ToUTF16(llvm::StringRef utf8, 1445341825Sdim llvm::SmallVectorImpl<wchar_t> &utf16) { 1446341825Sdim return CodePageToUTF16(CP_UTF8, utf8, utf16); 1447341825Sdim} 1448341825Sdim 1449341825Sdimstd::error_code CurCPToUTF16(llvm::StringRef curcp, 1450341825Sdim llvm::SmallVectorImpl<wchar_t> &utf16) { 1451341825Sdim return CodePageToUTF16(CP_ACP, curcp, utf16); 1452341825Sdim} 1453341825Sdim 1454280031Sdimstatic 1455280031Sdimstd::error_code UTF16ToCodePage(unsigned codepage, const wchar_t *utf16, 1456280031Sdim size_t utf16_len, 1457341825Sdim llvm::SmallVectorImpl<char> &converted) { 1458276479Sdim if (utf16_len) { 1459276479Sdim // Get length. 1460341825Sdim int len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, converted.begin(), 1461276479Sdim 0, NULL, NULL); 1462261991Sdim 1463341825Sdim if (len == 0) { 1464288943Sdim return mapWindowsError(::GetLastError()); 1465341825Sdim } 1466261991Sdim 1467341825Sdim converted.reserve(len); 1468341825Sdim converted.set_size(len); 1469261991Sdim 1470276479Sdim // Now do the actual conversion. 1471341825Sdim len = ::WideCharToMultiByte(codepage, 0, utf16, utf16_len, converted.data(), 1472341825Sdim converted.size(), NULL, NULL); 1473261991Sdim 1474341825Sdim if (len == 0) { 1475288943Sdim return mapWindowsError(::GetLastError()); 1476341825Sdim } 1477276479Sdim } 1478261991Sdim 1479341825Sdim // Make the new string null terminated. 1480341825Sdim converted.push_back(0); 1481341825Sdim converted.pop_back(); 1482261991Sdim 1483276479Sdim return std::error_code(); 1484218885Sdim} 1485280031Sdim 1486280031Sdimstd::error_code UTF16ToUTF8(const wchar_t *utf16, size_t utf16_len, 1487280031Sdim llvm::SmallVectorImpl<char> &utf8) { 1488280031Sdim return UTF16ToCodePage(CP_UTF8, utf16, utf16_len, utf8); 1489280031Sdim} 1490280031Sdim 1491280031Sdimstd::error_code UTF16ToCurCP(const wchar_t *utf16, size_t utf16_len, 1492341825Sdim llvm::SmallVectorImpl<char> &curcp) { 1493341825Sdim return UTF16ToCodePage(CP_ACP, utf16, utf16_len, curcp); 1494280031Sdim} 1495309124Sdim 1496261991Sdim} // end namespace windows 1497261991Sdim} // end namespace sys 1498261991Sdim} // end namespace llvm 1499