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-exception
6//
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(Source: src.GetPath(), Result&: wsrc) ||
34 !llvm::ConvertUTF8toWide(Source: dst.GetPath(), Result&: wdst))
35 error = Status::FromErrorString(str: 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(Source: src.GetPath(), Result&: wsrc)) {
55 error = Status::FromErrorString(str: 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 null
69 // 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(Source: buf.data(), Result&: path))
76 error = Status::FromErrorString(str: PATH_CONVERSION_ERROR);
77 else
78 dst.SetFile(path, style: 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 str: "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(Source: path, Result&: wpath))
92 return nullptr;
93 if (!llvm::ConvertUTF8toWide(Source: mode, Result&: 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(Source: path, Result&: wpath))
104 return -1;
105 // All other bits are rejected by _wsopen_s
106 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

source code of lldb/source/Host/windows/FileSystem.cpp