[hackers] [sbase] Restore state of buffer in errors || Roberto E. Vargas Caballero

[git]

commit 0cd385d16413e631222cdd73d141d4cb72b854a1
Author:     Roberto E. Vargas Caballero <k...@shike2.com>
AuthorDate: Mon Dec 14 15:38:46 2015 +0100
Commit:     sin <s...@2f30.org>
CommitDate: Mon Dec 14 14:52:53 2015 +0000

    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.

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);
 }