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https://lists.gnu.org/archive/html/bug-bash/2014-08/msg00082.html

From 2774192e93991e3d85ccc37c714aa018e442af6d Mon Sep 17 00:00:00 2001
From: Dylan Cali <calid1984@gmail.com>
Date: Sat, 23 Aug 2014 02:26:05 -0500
Subject: [PATCH] fix vi search prompt bug for long prompts

---
 display.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/display.c b/display.c
index 4df1f73..e575b16 100644
--- a/display.c
+++ b/display.c
@@ -2259,7 +2259,7 @@ rl_message (va_alist)
       va_start (args);
       format = va_arg (args, char *);
 #endif
-      vsnprintf (msg_buf, msg_bufsiz - 1, format, args);
+      vsnprintf (msg_buf, msg_bufsiz, format, args);
     }
 #else
   vsprintf (msg_buf, format, args);
-- 
1.7.10.4