[vte] ring: Add _vte_ring_reset()

[Egmont Koblinger <egmontkob src gnome org>]

commit fc9dcbba2e875e44e646287f8551a89297021a11
Author: Egmont Koblinger <egmont gmail com>
Date:   Sat Nov 29 13:28:46 2014 +0100

    ring: Add _vte_ring_reset()
    
    https://bugzilla.gnome.org/show_bug.cgi?id=738601#c75

 src/ring.c |   10 ++++++++++
 src/ring.h |    1 +
 src/vte.c  |    8 ++------
 3 files changed, 13 insertions(+), 6 deletions(-)
---
diff --git a/src/ring.c b/src/ring.c
index 6eb3569..59330b2 100644
--- a/src/ring.c
+++ b/src/ring.c
@@ -316,6 +316,16 @@ _vte_ring_reset_streams (VteRing *ring, gulong position)
        ring->last_attr.i = basic_cell.i.attr;
 }
 
+void
+_vte_ring_reset (VteRing *ring)
+{
+        _vte_debug_print (VTE_DEBUG_RING, "Reseting the ring.\n");
+
+        _vte_ring_reset_streams (ring, 0);
+        ring->start = ring->end = ring->writable = 0;
+        ring->cached_row_num = (gulong) -1;
+}
+
 static inline VteRowData *
 _vte_ring_writable_index (VteRing *ring, gulong position)
 {
diff --git a/src/ring.h b/src/ring.h
index ec38019..c23b06d 100644
--- a/src/ring.h
+++ b/src/ring.h
@@ -80,6 +80,7 @@ VteRowData *_vte_ring_index_writable (VteRing *ring, gulong position);
 
 void _vte_ring_init (VteRing *ring, gulong max_rows);
 void _vte_ring_fini (VteRing *ring);
+void _vte_ring_reset (VteRing *ring);
 void _vte_ring_resize (VteRing *ring, gulong max_rows);
 void _vte_ring_shrink (VteRing *ring, gulong max_len);
 VteRowData *_vte_ring_insert (VteRing *ring, gulong position);
diff --git a/src/vte.c b/src/vte.c
index 9ee5e73..01602c2 100644
--- a/src/vte.c
+++ b/src/vte.c
@@ -11789,12 +11789,8 @@ vte_terminal_reset(VteTerminal *terminal,
         pvt->character_replacement = &pvt->character_replacements[0];
        /* Clear the scrollback buffers and reset the cursors. */
        if (clear_history) {
-               _vte_ring_fini(pvt->normal_screen.row_data);
-               _vte_ring_init(pvt->normal_screen.row_data, pvt->scrollback_lines);
-                _vte_ring_set_visible_rows_hint(pvt->normal_screen.row_data, pvt->row_count);
-               _vte_ring_fini(pvt->alternate_screen.row_data);
-               _vte_ring_init(pvt->alternate_screen.row_data, pvt->row_count);
-                _vte_ring_set_visible_rows_hint(pvt->alternate_screen.row_data, pvt->row_count);
+                _vte_ring_reset(pvt->normal_screen.row_data);
+                _vte_ring_reset(pvt->alternate_screen.row_data);
                 pvt->normal_screen.saved.cursor.row = 0;
                 pvt->normal_screen.saved.cursor.col = 0;
                pvt->normal_screen.scroll_delta = 0;