stop hardcoding the default scrollback length

2 files changed, 13 insertions, 2 deletions

diff --git a/src/screen.c b/src/screen.c
index 15ca051..d543b13 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -43,6 +43,8 @@ void vt100_screen_set_window_size(VT100Screen *vt, int rows, int cols)
 
     vt->grid->max.row = rows;
     vt->grid->max.col = cols;
+    if (!vt->custom_scrollback_length)
+        vt->scrollback_length = rows;
 
     if (vt->grid->max.row == 0) {
         vt->grid->max.row = 1;
@@ -92,6 +94,12 @@ void vt100_screen_set_window_size(VT100Screen *vt, int rows, int cols)
     vt->grid->scroll_bottom = vt->grid->max.row - 1;
 }
 
+void vt100_screen_set_scrollback_length(VT100Screen *vt, int rows)
+{
+    vt->scrollback_length = rows;
+    vt->custom_scrollback_length = 1;
+}
+
 int vt100_screen_process_string(VT100Screen *vt, char *buf, size_t len)
 {
     int remaining;
@@ -856,8 +864,7 @@ static void vt100_screen_scroll_down(VT100Screen *vt, int count)
         }
     }
     else {
-        /* int scrollback = vt->config.scrollback_length; */
-        int scrollback = 4096; // XXX vt100
+        int scrollback = vt->scrollback_length;
 
         if (vt->grid->row_count + count > scrollback) {
             int overflow = vt->grid->row_count + count - scrollback;
diff --git a/src/screen.h b/src/screen.h
index 37a9ab7..b6d1ab5 100644
--- a/src/screen.h
+++ b/src/screen.h
@@ -92,6 +92,8 @@ struct vt100_screen {
 
     struct vt100_cell_attrs attrs;
 
+    int scrollback_length;
+
     yyscan_t scanner;
     YY_BUFFER_STATE state;
 
@@ -109,11 +111,13 @@ struct vt100_screen {
     unsigned char has_selection: 1;
 
     unsigned char dirty: 1;
+    unsigned char custom_scrollback_length: 1;
 };
 
 VT100Screen *vt100_screen_new(int rows, int cols);
 void vt100_screen_init(VT100Screen *vt);
 void vt100_screen_set_window_size(VT100Screen *vt, int rows, int cols);
+void vt100_screen_set_scrollback_length(VT100Screen *vt, int rows);
 int vt100_screen_process_string(VT100Screen *vt, char *buf, size_t len);
 int vt100_screen_loc_is_selected(VT100Screen *vt, struct vt100_loc loc);
 void vt100_screen_get_string(