1 //===-- FileSystem.cpp ------------------------------------------*- 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 #include "lldb/Host/windows/windows.h"
11 
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 
19 #include "llvm/Support/ConvertUTF.h"
20 #include "llvm/Support/FileSystem.h"
21 
22 using namespace lldb_private;
23 
24 const char *FileSystem::DEV_NULL = "nul";
25 
26 const char *FileSystem::PATH_CONVERSION_ERROR =
27     "Error converting path between UTF-8 and native encoding";
28 
29 Error FileSystem::Symlink(const FileSpec &src, const FileSpec &dst) {
30   Error error;
31   std::wstring wsrc, wdst;
32   if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc) ||
33       !llvm::ConvertUTF8toWide(dst.GetCString(), wdst))
34     error.SetErrorString(PATH_CONVERSION_ERROR);
35   if (error.Fail())
36     return error;
37   DWORD attrib = ::GetFileAttributesW(wdst.c_str());
38   if (attrib == INVALID_FILE_ATTRIBUTES) {
39     error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
40     return error;
41   }
42   bool is_directory = !!(attrib & FILE_ATTRIBUTE_DIRECTORY);
43   DWORD flag = is_directory ? SYMBOLIC_LINK_FLAG_DIRECTORY : 0;
44   BOOL result = ::CreateSymbolicLinkW(wsrc.c_str(), wdst.c_str(), flag);
45   if (!result)
46     error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
47   return error;
48 }
49 
50 Error FileSystem::Readlink(const FileSpec &src, FileSpec &dst) {
51   Error error;
52   std::wstring wsrc;
53   if (!llvm::ConvertUTF8toWide(src.GetCString(), wsrc)) {
54     error.SetErrorString(PATH_CONVERSION_ERROR);
55     return error;
56   }
57 
58   HANDLE h = ::CreateFileW(wsrc.c_str(), GENERIC_READ,
59                            FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
60                            OPEN_EXISTING, FILE_FLAG_OPEN_REPARSE_POINT, NULL);
61   if (h == INVALID_HANDLE_VALUE) {
62     error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
63     return error;
64   }
65 
66   std::vector<wchar_t> buf(PATH_MAX + 1);
67   // Subtract 1 from the path length since this function does not add a null
68   // terminator.
69   DWORD result = ::GetFinalPathNameByHandleW(
70       h, buf.data(), buf.size() - 1, FILE_NAME_NORMALIZED | VOLUME_NAME_DOS);
71   std::string path;
72   if (result == 0)
73     error.SetError(::GetLastError(), lldb::eErrorTypeWin32);
74   else if (!llvm::convertWideToUTF8(buf.data(), path))
75     error.SetErrorString(PATH_CONVERSION_ERROR);
76   else
77     dst.SetFile(path, false);
78 
79   ::CloseHandle(h);
80   return error;
81 }
82 
83 Error FileSystem::ResolveSymbolicLink(const FileSpec &src, FileSpec &dst) {
84   return Error("ResolveSymbolicLink() isn't implemented on Windows");
85 }
86 
87 FILE *FileSystem::Fopen(const char *path, const char *mode) {
88   std::wstring wpath, wmode;
89   if (!llvm::ConvertUTF8toWide(path, wpath))
90     return nullptr;
91   if (!llvm::ConvertUTF8toWide(mode, wmode))
92     return nullptr;
93   FILE *file;
94   if (_wfopen_s(&file, wpath.c_str(), wmode.c_str()) != 0)
95     return nullptr;
96   return file;
97 }
98