From fa82b5710357b78b227da38bf0a7913f281c15a0 Mon Sep 17 00:00:00 2001
From: tkchia <tkchia-cosmo@gmx.com>
Date: Sat, 10 Sep 2022 06:46:57 +0000
Subject: [PATCH] Bare metal VGA: implement "reverse video" (`\e[7m`) escape
 code

---
 libc/vga/tty.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libc/vga/tty.c b/libc/vga/tty.c
index 3094c9db6..e213b11ca 100644
--- a/libc/vga/tty.c
+++ b/libc/vga/tty.c
@@ -270,7 +270,11 @@ static void TtySetCodepage(struct Tty *tty, char id) {
  */
 static uint8_t TtyGetVgaAttr(struct Tty *tty)
 {
-  uint8_t attr = tty->fg | tty->bg << 4;
+  uint8_t attr;
+  if ((tty->pr & kTtyFlip) == 0)
+    attr = tty->fg | tty->bg << 4;
+  else
+    attr = tty->bg | tty->fg << 4;
 #ifdef VGA_USE_BLINK
   /*
    * If blinking is enabled, we can only have the 8 dark background color