From 0cd385d16413e631222cdd73d141d4cb72b854a1 Mon Sep 17 00:00:00 2001
From: "Roberto E. Vargas Caballero" <k0ga@shike2.com>
Date: Mon, 14 Dec 2015 15:38:46 +0100
Subject: [PATCH] Restore state of buffer in errors

When a error occurs it is important to remove all the modifications
done by the offending command and restore the value of dot to the
state before of executing the command.
---
 ed.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/ed.c b/ed.c
index b6b74a2..1944fae 100644
--- a/ed.c
+++ b/ed.c
@@ -62,6 +62,9 @@ static char *lastmatch;
 static struct undo udata;
 static int newcmd;
 
+
+static void undo(void);
+
 static void
 error(char *msg)
 {
@@ -80,6 +83,9 @@ error(char *msg)
 			/* nothing */;
 	}
 
+	if (!newcmd)
+		undo();
+	curln = ocurln;
 	longjmp(savesp, 1);
 }