ldlinux: Clear screen on ASCII 12 (form feed) in DISPLAY file

The ansi code won't handle \f the way we want, so we need to
explicitly clear the screen and reset the cursor position, like the
old 4.x code.

Signed-off-by: Matt Fleming <matt.fleming@intel.com>

diff --git a/com32/elflink/ldlinux/msg.c b/com32/elflink/ldlinux/msg.c
index 2efcc79..4692716 100644 (file)
--- a/com32/elflink/ldlinux/msg.c
+++ b/com32/elflink/ldlinux/msg.c
@@ -89,6 +89,11 @@ static inline void msg_ctrl_o(void)
        NextCharJump = msg_setbg;
 }
 
+static void msg_formfeed(void)
+{
+       printf("\033[2J\033[H");
+}
+
 static void msg_novga(void)
 {
        syslinux_force_text_mode();
@@ -191,6 +196,9 @@ static void msg_putchar(uint8_t ch)
                break;
        case 0x0D:              /* Ignore <CR> */
                break;
+       case 0x0C:              /* <FF> = clear screen */
+               msg_formfeed();
+               break;
        case 0x19:              /* <EM> = return to text mode */
                msg_novga();
                break;