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Support/FileSystem: Add equivalent implementation. 

llvm-svn: 120827
This commit is contained in:
Michael J. Spencer 2010-12-03 18:49:13 +00:00
parent ca242f2c36
commit 376d38753d
2 changed files with 90 additions and 0 deletions
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25
llvm/lib/Support/Unix/PathV2.inc
View File

@ -238,6 +238,31 @@ error_code exists(const Twine &path, bool &result) {
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.toNullTerminatedStringRef(a_storage);
StringRef b = B.toNullTerminatedStringRef(b_storage);
struct stat stat_a, stat_b;
int error_b = ::stat(b.begin(), &stat_b);
int error_a = ::stat(a.begin(), &stat_a);
// If both are invalid, it's an error. If only one is, the result is false.
if (error_a != 0 || error_b != 0) {
if (error_a == error_b)
return error_code(errno, system_category());
result = false;
} else {
result =
stat_a.st_dev == stat_b.st_dev &&
stat_a.st_ino == stat_b.st_ino;
}
return make_error_code(errc::success);
}
error_code unique_file(const Twine &model, int &result_fd,
SmallVectorImpl<char> &result_path) {
SmallString<128> Model;

65
llvm/lib/Support/Windows/PathV2.inc
View File

@ -341,6 +341,71 @@ error_code exists(const Twine &path, bool &result) {
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.