Fix device reading (#329)

* Avoid panic when reading device files

* Skip devices in find

* Fix root path in find

src/sys/fs/device.rs

@@ -38,6 +38,7 @@ pub enum Device {
 impl From<u8> for Device {
     fn from(i: u8) -> Self {
         match i {
+            i if i == DeviceType::File as u8 => Device::File(File::new()),
             i if i == DeviceType::Console as u8 => Device::Console(Console::new()),
             i if i == DeviceType::Random as u8 => Device::Random(Random::new()),
             i if i == DeviceType::Null as u8 => Device::Null,

src/sys/fs/file.rs

@@ -36,6 +36,16 @@ impl From<DirEntry> for File {
 }
 
 impl File {
+    pub fn new() -> Self {
+        Self {
+            parent: None,
+            name: String::new(),
+            addr: 0,
+            size: 0,
+            offset:0,
+        }
+    }
+
     pub fn create(pathname: &str) -> Option<Self> {
         let pathname = realpath(pathname);
         let dirname = dirname(&pathname);

src/usr/find.rs

@@ -77,9 +77,15 @@ fn print_matching_lines(path: &str, pattern: &str, state: &mut PrintingState) {
     if let Ok(files) = fs::read_dir(path) {
         state.is_recursive = true;
         for file in files {
-            let file_path = format!("{}/{}", path, file.name());
+            let mut file_path = path.to_string();
+            if !file_path.ends_with('/') {
+                file_path.push('/');
+            }
+            file_path.push_str(&file.name());
             if file.is_dir() {
                 print_matching_lines(&file_path, pattern, state);
+            } else if file.is_device() {
+                // Skip devices
             } else {
                 print_matching_lines_in_file(&file_path, pattern, state);
             }