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1//===-- FileSystem.cpp ----------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "lldb/Host/windows/windows.h"10 11#include <share.h>12#include <shellapi.h>13#include <sys/stat.h>14#include <sys/types.h>15 16#include "lldb/Host/FileSystem.h"17#include "lldb/Host/windows/AutoHandle.h"18#include "lldb/Host/windows/PosixApi.h"19 20#include "llvm/Support/ConvertUTF.h"21#include "llvm/Support/FileSystem.h"22 23using namespace lldb_private;24 25const char *FileSystem::DEV_NULL = "nul";26 27const char *FileSystem::PATH_CONVERSION_ERROR =28    "Error converting path between UTF-8 and native encoding";29 30Status FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {31  Status error;32  std::wstring wsrc, wdst;33  if (!llvm::ConvertUTF8toWide(src.GetPath(), wsrc) ||34      !llvm::ConvertUTF8toWide(dst.GetPath(), wdst))35    error = Status::FromErrorString(PATH_CONVERSION_ERROR);36  if (error.Fail())37    return error;38  DWORD attrib = ::GetFileAttributesW(wdst.c_str());39  if (attrib == INVALID_FILE_ATTRIBUTES) {40    error = Status(::GetLastError(), lldb::eErrorTypeWin32);41    return error;42  }43  bool is_directory = !!(attrib & FILE_ATTRIBUTE_DIRECTORY);44  DWORD flag = is_directory ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0;45  BOOL result = ::CreateSymbolicLinkW(wsrc.c_str(), wdst.c_str(), flag);46  if (!result)47    error = Status(::GetLastError(), lldb::eErrorTypeWin32);48  return error;49}50 51Status FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {52  Status error;53  std::wstring wsrc;54  if (!llvm::ConvertUTF8toWide(src.GetPath(), wsrc)) {55    error = Status::FromErrorString(PATH_CONVERSION_ERROR);56    return error;57  }58 59  HANDLE h = ::CreateFileW(wsrc.c_str(), GENERIC_READ,60                           FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,61                           OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT, NULL);62  if (h == INVALID_HANDLE_VALUE) {63    error = Status(::GetLastError(), lldb::eErrorTypeWin32);64    return error;65  }66 67  std::vector<wchar_t> buf(PATH_MAX + 1);68  // Subtract 1 from the path length since this function does not add a null69  // terminator.70  DWORD result = ::GetFinalPathNameByHandleW(71      h, buf.data(), buf.size() - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);72  std::string path;73  if (result == 0)74    error = Status(::GetLastError(), lldb::eErrorTypeWin32);75  else if (!llvm::convertWideToUTF8(buf.data(), path))76    error = Status::FromErrorString(PATH_CONVERSION_ERROR);77  else78    dst.SetFile(path, FileSpec::Style::native);79 80  ::CloseHandle(h);81  return error;82}83 84Status FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {85  return Status::FromErrorString(86      "ResolveSymbolicLink() isn't implemented on Windows");87}88 89FILE *FileSystem::Fopen(const char *path, const char *mode) {90  std::wstring wpath, wmode;91  if (!llvm::ConvertUTF8toWide(path, wpath))92    return nullptr;93  if (!llvm::ConvertUTF8toWide(mode, wmode))94    return nullptr;95  FILE *file;96  if (_wfopen_s(&file, wpath.c_str(), wmode.c_str()) != 0)97    return nullptr;98  return file;99}100 101int FileSystem::Open(const char *path, int flags, int mode) {102  std::wstring wpath;103  if (!llvm::ConvertUTF8toWide(path, wpath))104    return -1;105  // All other bits are rejected by _wsopen_s106  mode = mode & (_S_IREAD | _S_IWRITE);107  int result;108  ::_wsopen_s(&result, wpath.c_str(), flags, _SH_DENYNO, mode);109  return result;110}111