From a231fbf12c543534c6b300648e8c3a8b467968cf Mon Sep 17 00:00:00 2001
From: Paul Mason <paul@paulmason.me>
Date: Tue, 8 Jun 2021 06:56:24 +1200
Subject: [PATCH] Fixes issue with remainder overflow

---
 src/ops/div.rs         | 2 +-
 tests/decimal_tests.rs | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/ops/div.rs b/src/ops/div.rs
index 948a0405..3b5ec577 100644
--- a/src/ops/div.rs
+++ b/src/ops/div.rs
@@ -196,7 +196,7 @@ impl Buf16 {
             if num < prod1 {
                 // Detected carry.
                 let tmp = remainder;
-                remainder += 1;
+                remainder = remainder.wrapping_add(1);
                 if tmp < divisor_hi {
                     break;
                 }
diff --git a/tests/decimal_tests.rs b/tests/decimal_tests.rs
index 117f4aa6..6a838d5c 100644
--- a/tests/decimal_tests.rs
+++ b/tests/decimal_tests.rs
@@ -3989,4 +3989,13 @@ mod issues {
         // - 714606667614253123173036.85120
         assert_eq!("-714606667614253123173036.85120", c.unwrap().to_string());
     }
+
+    #[test]
+    fn issue_392_overflow_during_remainder() {
+        let a = Decimal::from_str("-79228157791897.854723898738431").unwrap();
+        let b = Decimal::from_str("184512476.73336922111").unwrap();
+        let c = a.checked_div(b);
+        assert!(c.is_some());
+        assert_eq!("-429391.87200000000002327170816", c.unwrap().to_string())
+    }
 }