kernel_cmdline: Derive Default for Cmdline

Signed-off-by: John Eckersberg <[email protected]>

Author: jeckersb

crates/kernel_cmdline/src/bytes.rs

@@ -14,7 +14,7 @@ use anyhow::Result;
 /// Wraps the raw command line bytes and provides methods for parsing and iterating
 /// over individual parameters. Uses copy-on-write semantics to avoid unnecessary
 /// allocations when working with borrowed data.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Cmdline<'a>(Cow<'a, [u8]>);
 
 impl<'a, T: AsRef<[u8]> + ?Sized> From<&'a T> for Cmdline<'a> {
@@ -539,6 +539,12 @@ mod tests {
         assert!(kargs.find("nothing").is_none());
     }
 
+    #[test]
+    fn test_cmdline_default() {
+        let kargs: Cmdline = Default::default();
+        assert_eq!(kargs.iter().next(), None);
+    }
+
     #[test]
     fn test_kargs_iter_utf8() {
         let kargs = Cmdline::from(b"foo=bar,bar2 \xff baz=fuz bad=oh\xffno wiz");

crates/kernel_cmdline/src/utf8.rs

@@ -14,7 +14,7 @@ use anyhow::Result;
 /// Wraps the raw command line bytes and provides methods for parsing and iterating
 /// over individual parameters. Uses copy-on-write semantics to avoid unnecessary
 /// allocations when working with borrowed data.
-#[derive(Debug)]
+#[derive(Debug, Default)]
 pub struct Cmdline<'a>(bytes::Cmdline<'a>);
 
 impl<'a, T: AsRef<str> + ?Sized> From<&'a T> for Cmdline<'a> {
@@ -494,6 +494,12 @@ mod tests {
         assert!(kargs.find("nothing").is_none());
     }
 
+    #[test]
+    fn test_cmdline_default() {
+        let kargs: Cmdline = Default::default();
+        assert_eq!(kargs.iter().next(), None);
+    }
+
     #[test]
     fn test_kargs_simple_from_string() {
         let kargs = Cmdline::from("foo=bar,bar2 baz=fuz wiz".to_string());