forked from OSchip/llvm-project
294 lines
8.5 KiB
C++
294 lines
8.5 KiB
C++
//===-- FileSystem.cpp ------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "lldb/Host/windows/windows.h"
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#include <shellapi.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "lldb/Host/FileSystem.h"
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#include "lldb/Host/windows/AutoHandle.h"
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#include "llvm/Support/ConvertUTF.h"
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#include "llvm/Support/FileSystem.h"
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using namespace lldb_private;
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const char *
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FileSystem::DEV_NULL = "nul";
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const char *FileSystem::PATH_CONVERSION_ERROR = "Error converting path between UTF-8 and native encoding";
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FileSpec::PathSyntax
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FileSystem::GetNativePathSyntax()
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{
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return FileSpec::ePathSyntaxWindows;
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}
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Error
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FileSystem::MakeDirectory(const FileSpec &file_spec, uint32_t file_permissions)
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{
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// On Win32, the mode parameter is ignored, as Windows files and directories support a
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// different permission model than POSIX.
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Error error;
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const auto err_code = llvm::sys::fs::create_directories(file_spec.GetPath(), true);
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if (err_code)
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{
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error.SetErrorString(err_code.message().c_str());
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}
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return error;
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}
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Error
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FileSystem::DeleteDirectory(const FileSpec &file_spec, bool recurse)
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{
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Error error;
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std::wstring path_buffer;
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if (!llvm::ConvertUTF8toWide(file_spec.GetPath(), path_buffer))
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{
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error.SetErrorString(PATH_CONVERSION_ERROR);
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return error;
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}
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if (!recurse)
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{
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BOOL result = ::RemoveDirectoryW(path_buffer.c_str());
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if (!result)
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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}
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else
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{
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// SHFileOperation() accepts a list of paths, and so must be double-null-terminated to
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// indicate the end of the list. The first null terminator is there only in the backing
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// store but not the actual vector contents, and so we need to push twice.
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path_buffer.push_back(0);
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path_buffer.push_back(0);
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SHFILEOPSTRUCTW shfos = {0};
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shfos.wFunc = FO_DELETE;
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shfos.pFrom = (LPCWSTR)path_buffer.data();
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shfos.fFlags = FOF_NO_UI;
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int result = ::SHFileOperationW(&shfos);
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// TODO(zturner): Correctly handle the intricacies of SHFileOperation return values.
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if (result != 0)
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error.SetErrorStringWithFormat("SHFileOperation failed");
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}
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return error;
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}
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Error
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FileSystem::GetFilePermissions(const FileSpec &file_spec, uint32_t &file_permissions)
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{
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Error error;
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// Beware that Windows's permission model is different from Unix's, and it's
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// not clear if this API is supposed to check ACLs. To match the caller's
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// expectations as closely as possible, we'll use Microsoft's _stat, which
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// attempts to emulate POSIX stat. This should be good enough for basic
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// checks like FileSpec::Readable.
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struct _stat file_stats;
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if (::_stat(file_spec.GetCString(), &file_stats) == 0)
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{
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// The owner permission bits in "st_mode" currently match the definitions
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// for the owner file mode bits.
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file_permissions = file_stats.st_mode & (_S_IREAD | _S_IWRITE | _S_IEXEC);
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}
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else
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{
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error.SetErrorToErrno();
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}
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return error;
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}
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Error
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FileSystem::SetFilePermissions(const FileSpec &file_spec, uint32_t file_permissions)
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{
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Error error;
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error.SetErrorStringWithFormat("%s is not supported on this host", __PRETTY_FUNCTION__);
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return error;
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}
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lldb::user_id_t
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FileSystem::GetFileSize(const FileSpec &file_spec)
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{
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return file_spec.GetByteSize();
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}
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bool
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FileSystem::GetFileExists(const FileSpec &file_spec)
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{
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return file_spec.Exists();
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}
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Error
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FileSystem::Hardlink(const FileSpec &src, const FileSpec &dst)
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{
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Error error;
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std::wstring wsrc, wdst;
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if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc) || !llvm::ConvertUTF8toWide(dst.GetCString(), wdst))
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error.SetErrorString(PATH_CONVERSION_ERROR);
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else if (!::CreateHardLinkW(wsrc.c_str(), wdst.c_str(), nullptr))
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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return error;
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}
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int
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FileSystem::GetHardlinkCount(const FileSpec &file_spec)
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{
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std::wstring path;
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if (!llvm::ConvertUTF8toWide(file_spec.GetCString(), path))
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return -1;
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HANDLE file_handle = ::CreateFileW(path.c_str(), FILE_READ_ATTRIBUTES, FILE_SHARE_READ, nullptr, OPEN_EXISTING,
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FILE_ATTRIBUTE_NORMAL, nullptr);
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if (file_handle == INVALID_HANDLE_VALUE)
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return -1;
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AutoHandle auto_file_handle(file_handle);
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BY_HANDLE_FILE_INFORMATION file_info;
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if (::GetFileInformationByHandle(file_handle, &file_info))
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return file_info.nNumberOfLinks;
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return -1;
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}
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Error
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FileSystem::Symlink(const FileSpec &src, const FileSpec &dst)
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{
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Error error;
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std::wstring wsrc, wdst;
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if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc) || !llvm::ConvertUTF8toWide(dst.GetCString(), wdst))
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error.SetErrorString(PATH_CONVERSION_ERROR);
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if (error.Fail())
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return error;
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DWORD attrib = ::GetFileAttributesW(wdst.c_str());
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if (attrib == INVALID_FILE_ATTRIBUTES)
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{
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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return error;
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}
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bool is_directory = !!(attrib & FILE_ATTRIBUTE_DIRECTORY);
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DWORD flag = is_directory ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0;
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BOOL result = ::CreateSymbolicLinkW(wsrc.c_str(), wdst.c_str(), flag);
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if (!result)
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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return error;
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}
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Error
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FileSystem::Unlink(const FileSpec &file_spec)
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{
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Error error;
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std::wstring path;
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if (!llvm::ConvertUTF8toWide(file_spec.GetCString(), path))
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{
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error.SetErrorString(PATH_CONVERSION_ERROR);
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return error;
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}
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BOOL result = ::DeleteFileW(path.c_str());
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if (!result)
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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return error;
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}
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Error
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FileSystem::Readlink(const FileSpec &src, FileSpec &dst)
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{
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Error error;
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std::wstring wsrc;
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if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc))
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{
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error.SetErrorString(PATH_CONVERSION_ERROR);
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return error;
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}
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HANDLE h = ::CreateFileW(wsrc.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
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FILE_FLAG_OPEN_REPARSE_POINT, NULL);
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if (h == INVALID_HANDLE_VALUE)
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{
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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return error;
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}
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std::vector<wchar_t> buf(PATH_MAX + 1);
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// Subtract 1 from the path length since this function does not add a null terminator.
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DWORD result = ::GetFinalPathNameByHandleW(h, buf.data(), buf.size() - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
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std::string path;
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if (result == 0)
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error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
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else if (!llvm::convertWideToUTF8(buf.data(), path))
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error.SetErrorString(PATH_CONVERSION_ERROR);
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else
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dst.SetFile(path, false);
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::CloseHandle(h);
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return error;
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}
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Error
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FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst)
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{
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return Error("ResolveSymbolicLink() isn't implemented on Windows");
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}
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bool
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FileSystem::IsLocal(const FileSpec &spec)
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{
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if (spec)
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{
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// TODO: return true if the file is on a locally mounted file system
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return true;
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}
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return false;
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}
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FILE *
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FileSystem::Fopen(const char *path, const char *mode)
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{
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std::wstring wpath, wmode;
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if (!llvm::ConvertUTF8toWide(path, wpath))
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return nullptr;
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if (!llvm::ConvertUTF8toWide(mode, wmode))
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return nullptr;
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FILE *file;
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if (_wfopen_s(&file, wpath.c_str(), wmode.c_str()) != 0)
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return nullptr;
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return file;
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}
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int
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FileSystem::Stat(const char *path, struct stat *stats)
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{
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std::wstring wpath;
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if (!llvm::ConvertUTF8toWide(path, wpath))
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{
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errno = EINVAL;
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return -EINVAL;
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}
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int stat_result;
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#ifdef _USE_32BIT_TIME_T
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struct _stat32 file_stats;
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stat_result = ::_wstat32(wpath.c_str(), &file_stats);
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#else
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struct _stat64i32 file_stats;
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stat_result = ::_wstat64i32(wpath.c_str(), &file_stats);
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#endif
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if (stat_result == 0)
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{
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static_assert(sizeof(struct stat) == sizeof(file_stats),
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"stat and _stat32/_stat64i32 must have the same layout");
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*stats = *reinterpret_cast<struct stat *>(&file_stats);
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}
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return stat_result;
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}
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