Update tail pointer correctly so scrolling works.

diff --git a/terminal.c b/terminal.c
index dc43d6a..6bc6a51 100644 (file)
--- a/terminal.c
+++ b/terminal.c
@@ -55,7 +55,7 @@ struct terminal {
        struct wl_display *display;
        int resize_scheduled;
        char *data;
-       int width, height, tail, row, column;
+       int width, height, tail, row, column, total_rows;
        int fd, master;
        struct buffer *buffer;
        GIOChannel *channel;
@@ -149,9 +149,17 @@ terminal_data(struct terminal *terminal, const char *data, size_t length)
                        break;
                case '\n':
                        terminal->row++;
+                       terminal->total_rows++;
                        terminal->column = 0;
                        if (terminal->row == terminal->height)
                                terminal->row = 0;
+                       if (terminal->row == terminal->tail && terminal->total_rows > 0) {
+                               memset(&terminal->data[terminal->row * (terminal->width + 1)],
+                                      0, terminal->width);
+                               terminal->tail++;
+                       }
+                       if (terminal->tail == terminal->height)
+                               terminal->tail = 0;
                        break;
                case '\t':
                        memset(&row[terminal->column], ' ', -terminal->column & 7);