Support/FileSystem: Add equivalent implementation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120827 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/Windows/PathV2.inc b/lib/Support/Windows/PathV2.inc
index 8377310..e7aa93b 100644
--- a/lib/Support/Windows/PathV2.inc
+++ b/lib/Support/Windows/PathV2.inc
@@ -341,6 +341,71 @@
return make_error_code(errc::success);
}
+error_code equivalent(const Twine &A, const Twine &B, bool &result) {
+ // Get arguments.
+ SmallString<128> a_storage;
+ SmallString<128> b_storage;
+ StringRef a = A.toStringRef(a_storage);
+ StringRef b = B.toStringRef(b_storage);
+
+ // Convert to utf-16.
+ SmallVector<wchar_t, 128> wide_a;
+ SmallVector<wchar_t, 128> wide_b;
+ if (error_code ec = UTF8ToUTF16(a, wide_a)) return ec;
+ if (error_code ec = UTF8ToUTF16(b, wide_b)) return ec;
+
+ AutoHandle HandleB(
+ ::CreateFileW(wide_b.begin(),
+ 0,
+ FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+ 0,
+ OPEN_EXISTING,
+ FILE_FLAG_BACKUP_SEMANTICS,
+ 0));
+
+ AutoHandle HandleA(
+ ::CreateFileW(wide_a.begin(),
+ 0,
+ FILE_SHARE_DELETE | FILE_SHARE_READ | FILE_SHARE_WRITE,
+ 0,
+ OPEN_EXISTING,
+ FILE_FLAG_BACKUP_SEMANTICS,
+ 0));
+
+ // If both handles are invalid, it's an error.
+ if (HandleA == INVALID_HANDLE_VALUE &&
+ HandleB == INVALID_HANDLE_VALUE)
+ return make_error_code(windows_error(::GetLastError()));
+
+ // If only one is invalid, it's false.
+ if (HandleA == INVALID_HANDLE_VALUE &&
+ HandleB == INVALID_HANDLE_VALUE) {
+ result = false;
+ return make_error_code(errc::success);
+ }
+
+ // Get file information.
+ BY_HANDLE_FILE_INFORMATION InfoA, InfoB;
+ if (!::GetFileInformationByHandle(HandleA, &InfoA))
+ return make_error_code(windows_error(::GetLastError()));
+ if (!::GetFileInformationByHandle(HandleB, &InfoB))
+ return make_error_code(windows_error(::GetLastError()));
+
+ // See if it's all the same.
+ result =
+ InfoA.dwVolumeSerialNumber == InfoB.dwVolumeSerialNumber &&
+ InfoA.nFileIndexHigh == InfoB.nFileIndexHigh &&
+ InfoA.nFileIndexLow == InfoB.nFileIndexLow &&
+ InfoA.nFileSizeHigh == InfoB.nFileSizeHigh &&
+ InfoA.nFileSizeLow == InfoB.nFileSizeLow &&
+ InfoA.ftLastWriteTime.dwLowDateTime ==
+ InfoB.ftLastWriteTime.dwLowDateTime &&
+ InfoA.ftLastWriteTime.dwHighDateTime ==
+ InfoB.ftLastWriteTime.dwHighDateTime;
+
+ return make_error_code(errc::success);
+}
+
error_code unique_file(const Twine &model, int &result_fd,
SmallVectorImpl<char> &result_path) {
// Use result_path as temp storage.