From f6992255dff64e42e690a2ab02bf3ea054157dd2 Mon Sep 17 00:00:00 2001
From: Alex Crichton <alex@alexcrichton.com>
Date: Fri, 30 Dec 2016 17:34:11 -0800
Subject: Escape control characters when encoding strings

Closes #126
---
 src/display.rs | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/display.rs')

diff --git a/src/display.rs b/src/display.rs
index f563b77..0a41e2a 100644
--- a/src/display.rs
+++ b/src/display.rs
@@ -49,6 +49,9 @@ fn write_str(f: &mut fmt::Formatter, s: &str) -> fmt::Result {
             '\u{d}' => try!(write!(f, "\\r")),
             '\u{22}' => try!(write!(f, "\\\"")),
             '\u{5c}' => try!(write!(f, "\\\\")),
+            c if c < '\u{1f}' => {
+                try!(write!(f, "\\u{:04}", ch as u32))
+            }
             ch => try!(write!(f, "{}", ch)),
         }
     }
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