slip: DumpHex prints utf8 debug output too

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/src/slip.rs b/src/slip.rs
index b1d6eca91d53c5d8b2324d2723be8fa9b58f88bd..0b1fe6c93574e6de350fa2e99184fd24ad494d06 100644 (file)
--- a/src/slip.rs
+++ b/src/slip.rs
@@ -180,6 +180,12 @@ impl Debug for DumpHex<'_> {
   #[throws(fmt::Error)]
   fn fmt(&self, f: &mut fmt::Formatter) {
     for v in self.0 { write!(f, "{:02x}", v)?; }
+    match str::from_utf8(self.0) {
+      Ok(s) => write!(f, "={:?}", s)?,
+      Err(x) => write!(f, "={:?}..",
+                       str::from_utf8(&self.0[0..x.valid_up_to()]).unwrap()
+      )?,
+    }
   }
 }