From be457afdae3087d0f78ce69267be1ce5f0ffe5f0 Mon Sep 17 00:00:00 2001
From: Elichai Turkel <elichai.turkel@gmail.com>
Date: Tue, 21 May 2019 22:02:57 +0300
Subject: [PATCH] Removed ffi call from Display implementation

---
 src/lib.rs | 16 +++-------------
 1 file changed, 3 insertions(+), 13 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 58c0a4d..b5e458f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -179,19 +179,9 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 
 impl fmt::Display for Signature {
 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-    let mut v = [0; 72];
-    let mut len = v.len() as usize;
-    unsafe {
-        let err = ffi::secp256k1_ecdsa_signature_serialize_der(
-            ffi::secp256k1_context_no_precomp,
-            v.as_mut_ptr(),
-            &mut len,
-            self.as_ptr()
-        );
-        debug_assert!(err == 1);
-    }
-    for i in 0..len {
-        write!(f, "{:02x}", v[i])?;
+    let sig = self.serialize_der();
+    for v in sig.iter() {
+        write!(f, "{:02x}", v)?;
     }
     Ok(())
 }