From 77500c5ad5c628a1ba469c2a115c1de3fc8b818a Mon Sep 17 00:00:00 2001
From: zeertzjq <zeertzjq@outlook.com>
Date: Sun, 10 Aug 2025 07:23:59 +0800
Subject: [PATCH] vim-patch:9.1.1611: possible undefined behaviour in
 mb_decompose() (#35275)
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Problem:  possible undefined behaviour in mb_decompose(), when using the
          same pointer as argument several times
Solution: use separate assignments to avoid reading and writing the same
          object at the same time (Áron Hárnási)

closes: vim/vim#17953

https://github.com/vim/vim/commit/c43a0614d40a3892a9cb2b9d75f61a19a3de0226

Co-authored-by: Áron Hárnási <aron.harnasi@gmail.com>
---
 src/nvim/regexp.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/nvim/regexp.c b/src/nvim/regexp.c
index 7a8d963dee..c07831f03d 100644
--- a/src/nvim/regexp.c
+++ b/src/nvim/regexp.c
@@ -1729,7 +1729,8 @@ static void mb_decompose(int c, int *c1, int *c2, int *c3)
     *c3 = d.c;
   } else {
     *c1 = c;
-    *c2 = *c3 = 0;
+    *c2 = 0;
+    *c3 = 0;
   }
 }