From dc1936f3972c9ba441bd6d2253669a3bbb97fdcb Mon Sep 17 00:00:00 2001
From: "Michael D. Lowis" <mike.lowis@gentex.com>
Date: Tue, 4 Sep 2018 16:20:56 -0400
Subject: [PATCH] added functions for log start and stop

---
 inc/edit.h | 2 ++
 lib/buf.c  | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/inc/edit.h b/inc/edit.h
index 02f2a59..153bbda 100644
--- a/inc/edit.h
+++ b/inc/edit.h
@@ -49,6 +49,8 @@ void buf_del(Buf* buf);
 
 void buf_undo(Buf* buf);
 void buf_redo(Buf* buf);
+void buf_logstart(Buf* buf);
+void buf_logstop(Buf* buf);
 void buf_logclear(Buf* buf);
 void buf_lastins(Buf* buf);
 
diff --git a/lib/buf.c b/lib/buf.c
index b0c634b..169848d 100644
--- a/lib/buf.c
+++ b/lib/buf.c
@@ -231,6 +231,15 @@ static void log_swap(Buf* buf, Log** src, Log** dest) {
     dumplog(buf);
 }
 
+void buf_logstart(Buf* buf) {
+    buf->transid = abs(buf->transid);
+}
+
+void buf_logstop(Buf* buf) {
+    if (buf->transid > 0)
+        buf->transid = -(buf->transid + 1);
+}
+
 void buf_undo(Buf* buf) {
     log_swap(buf, &(buf->undo), &(buf->redo));
 }
-- 
2.49.0