feat(network): impl display for [Ipv4Addr]

Signed-off-by: Anhad Singh <[email protected]>

src/data_link.rs

@@ -226,3 +226,16 @@ impl<U: Protocol> Stack<U> for Arp {
 crate::impl_stack!(@make Arp {
     fn write_stage2(&self, _mem: NonNull<u8>, _payload_len: usize) {}
 });
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use alloc::string::ToString;
+
+    #[test]
+    fn mac_addr_fmt() {
+        let mac = MacAddr([0x00, 0x01, 0x02, 0x03, 0x04, 0x05]);
+        assert_eq!(mac.to_string(), "00:01:02:03:04:05");
+    }
+}

src/network.rs

@@ -1,3 +1,5 @@
+use core::fmt;
+
 use byte_endian::BigEndian;
 use static_assertions::const_assert_eq;
 
@@ -31,6 +33,13 @@ impl From<[u8; Ipv4Addr::ADDR_SIZE]> for Ipv4Addr {
     }
 }
 
+impl fmt::Display for Ipv4Addr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}.{}.{}.{}", self.0[0], self.0[1], self.0[2], self.0[3])?;
+        Ok(())
+    }
+}
+
 #[derive(Debug, Copy, Clone, PartialEq)]
 #[repr(u8)]
 pub enum Ipv4Type {
@@ -110,3 +119,15 @@ crate::impl_stack!(@make Ipv4 {
         ipv4.checksum = checksum::make(checksum::calculate(ipv4));
     }
 });
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    use alloc::string::ToString;
+
+    #[test]
+    fn ipv4_addr_fmt() {
+        assert_eq!(Ipv4Addr::new([127, 0, 0, 1]).to_string(), "127.0.0.1");
+    }
+}