impl Display for CStr{,ing}

Delegate to `<ByteStr as Display>::fmt`.

Link: rust-lang/libs-team#550
Link: #139984.

Author: tamird

Diff for: library/alloc/src/ffi/c_str.rs

@@ -716,6 +716,12 @@ impl fmt::Debug for CString {
     }
 }
 
+impl fmt::Display for CString {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(&**self, f)
+    }
+}
+
 #[stable(feature = "cstring_into", since = "1.7.0")]
 impl From<CString> for Vec<u8> {
     /// Converts a [`CString`] into a <code>[Vec]<[u8]></code>.

Diff for: library/core/src/ffi/c_str.rs

@@ -169,6 +169,12 @@ impl fmt::Debug for CStr {
     }
 }
 
+impl fmt::Display for CStr {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        fmt::Display::fmt(crate::bstr::ByteStr::from_bytes(self.to_bytes()), f)
+    }
+}
+
 #[stable(feature = "cstr_default", since = "1.10.0")]
 impl Default for &CStr {
     #[inline]