kernel: cons: Add ANSI cursor pos reset sequence

- Add support for the "\033[H" ANSI escape sequence to
  reset the cursor to the 'home' position

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 18 insertions, 0 deletions

diff --git a/sys/dev/cons/cons.c b/sys/dev/cons/cons.c
index 88f394b..ce2b154 100644
--- a/sys/dev/cons/cons.c
+++ b/sys/dev/cons/cons.c
@@ -422,6 +422,17 @@ cons_update_color(struct cons_screen *scr, uint32_t fg, uint32_t bg)
     scr->bg = bg;
 }
 
+void
+cons_reset_cursor(struct cons_screen *scr)
+{
+    HIDE_CURSOR(scr);
+    scr->ch_col = 0;
+    scr->ch_row = 0;
+    scr->curs_col = 0;
+    scr->curs_row = 0;
+    SHOW_CURSOR(scr);
+}
+
 /*
  * Put a character on the screen.
  *
diff --git a/sys/dev/cons/cons_ansi.c b/sys/dev/cons/cons_ansi.c
index a91f1d3..4403f9c 100644
--- a/sys/dev/cons/cons_ansi.c
+++ b/sys/dev/cons/cons_ansi.c
@@ -88,6 +88,13 @@ ansi_feed(struct ansi_state *statep, char c)
         statep->csi = 2;
         statep->prev = c;
         return c;
+    case 2:
+        if (c == 'H') {
+            cons_reset_cursor(&g_root_scr);
+            ansi_reset(statep);
+            return ANSI_UPDATE_CURSOR;
+        }
+        break;
     }
 
     if (!statep->set_fg && !statep->set_bg) {