From db5370c5df6aeeb04610d5e32b04ea49ff220b29 Mon Sep 17 00:00:00 2001
From: Tyera Eulberg <tyera@solana.com>
Date: Mon, 11 Mar 2019 14:25:08 -0600
Subject: [PATCH] Add helper macro to implement bincode serialization of
 program-specific errors

---
 sdk/src/native_program.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/sdk/src/native_program.rs b/sdk/src/native_program.rs
index 6c9e8e548d..ebebc23a51 100644
--- a/sdk/src/native_program.rs
+++ b/sdk/src/native_program.rs
@@ -51,6 +51,20 @@ impl std::fmt::Display for ProgramError {
 }
 impl std::error::Error for ProgramError {}
 
+// Convenience macro to serialize (and potentially truncate) a program-specific error to pass in
+// ProgramError::CustomError
+#[macro_export]
+macro_rules! custom_error(
+    ($program_error:expr) => ({
+        use bincode::serialize;
+        let mut error = serialize(&$program_error).expect("failed to serialize program error");
+        if error.len() > 32 {
+            error.truncate(32);
+        }
+        error
+    });
+);
+
 // All native programs export a symbol named process()
 pub const ENTRYPOINT: &str = "process";