private static Microsoft.Win32.SafeHandles.SafeDirectoryHandle OpenDirectory(string fullPath)
{
Microsoft.Win32.SafeHandles.SafeDirectoryHandle handle = Interop.Sys.OpenDir(fullPath);
if (handle.IsInvalid)
{
throw Interop.GetExceptionForIoErrno(Interop.Sys.GetLastErrorInfo(), fullPath, isDirectory: true);
}
return(handle);
}
private IEnumerator <T> Enumerate(Microsoft.Win32.SafeHandles.SafeDirectoryHandle dirHandle)
{
if (dirHandle == null)
{
// Empty search
yield break;
}
Debug.Assert(!dirHandle.IsInvalid);
Debug.Assert(!dirHandle.IsClosed);
// Maintain a stack of the directories to explore, in the case of SearchOption.AllDirectories
// Lazily-initialized only if we find subdirectories that will be explored.
Stack <PathPair> toExplore = null;
PathPair dirPath = _initialDirectory;
while (dirHandle != null)
{
try
{
// Read each entry from the enumerator
Interop.Sys.DirectoryEntry dirent;
while (Interop.Sys.ReadDir(dirHandle, out dirent) == 0)
{
// Get from the dir entry whether the entry is a file or directory.
// We classify everything as a file unless we know it to be a directory.
bool isDir;
if (dirent.InodeType == Interop.Sys.NodeType.DT_DIR)
{
// We know it's a directory.
isDir = true;
}
else if (dirent.InodeType == Interop.Sys.NodeType.DT_LNK || dirent.InodeType == Interop.Sys.NodeType.DT_UNKNOWN)
{
// It's a symlink or unknown: stat to it to see if we can resolve it to a directory.
// If we can't (e.g. symlink to a file, broken symlink, etc.), we'll just treat it as a file.
Interop.ErrorInfo errnoIgnored;
isDir = DirectoryExists(Path.Combine(dirPath.FullPath, dirent.InodeName), out errnoIgnored);
}
else
{
// Otherwise, treat it as a file. This includes regular files, FIFOs, etc.
isDir = false;
}
// Yield the result if the user has asked for it. In the case of directories,
// always explore it by pushing it onto the stack, regardless of whether
// we're returning directories.
if (isDir)
{
if (!ShouldIgnoreDirectory(dirent.InodeName))
{
string userPath = null;
if (_searchOption == SearchOption.AllDirectories)
{
if (toExplore == null)
{
toExplore = new Stack <PathPair>();
}
userPath = Path.Combine(dirPath.UserPath, dirent.InodeName);
toExplore.Push(new PathPair(userPath, Path.Combine(dirPath.FullPath, dirent.InodeName)));
}
if (_includeDirectories &&
Interop.Sys.FnMatch(_searchPattern, dirent.InodeName, Interop.Sys.FnMatchFlags.FNM_NONE) == 0)
{
yield return(_translateResult(userPath ?? Path.Combine(dirPath.UserPath, dirent.InodeName), /*isDirectory*/ true));
}
}
}
else if (_includeFiles &&
Interop.Sys.FnMatch(_searchPattern, dirent.InodeName, Interop.Sys.FnMatchFlags.FNM_NONE) == 0)
{
yield return(_translateResult(Path.Combine(dirPath.UserPath, dirent.InodeName), /*isDirectory*/ false));
}
}
}
finally
{
// Close the directory enumerator
dirHandle.Dispose();
dirHandle = null;
}
if (toExplore != null && toExplore.Count > 0)
{
// Open the next directory.
dirPath = toExplore.Pop();
dirHandle = OpenDirectory(dirPath.FullPath);
}
}
}