From 7c06c75d6cf463d281f5269afe8e34d720ed9114 Mon Sep 17 00:00:00 2001
From: Bananymous <bananymousosq@gmail.com>
Date: Tue, 15 Nov 2022 09:26:14 +0200
Subject: [PATCH] Move cursor in terminal when writing to it

---
 kernel/arch/i386/tty.cpp    | 24 ++++++++++++++++++++++++
 kernel/include/kernel/tty.h |  1 +
 2 files changed, 25 insertions(+)

diff --git a/kernel/arch/i386/tty.cpp b/kernel/arch/i386/tty.cpp
index 9c8af8b6c2..d723227815 100644
--- a/kernel/arch/i386/tty.cpp
+++ b/kernel/arch/i386/tty.cpp
@@ -56,6 +56,28 @@ void terminal_clear_line(size_t line)
 		terminal_putentryat(' ', terminal_color, x, line);
 }
 
+
+static inline void outb(uint16_t port, uint8_t value)
+{
+    asm volatile ("outb %0, %1" : : "a" (value), "Nd" (port));
+}
+static void terminal_update_cursor()
+{
+	uint16_t pos = terminal_row * VGA_WIDTH + terminal_col;
+ 
+	outb(0x3D4, 0x0F);
+	outb(0x3D5, (uint8_t) (pos & 0xFF));
+	outb(0x3D4, 0x0E);
+	outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
+}
+
+void terminal_set_cursor_pos(int x, int y)
+{
+	terminal_row = y;
+	terminal_col = x;
+	terminal_update_cursor();
+}
+
 void terminal_putchar(char c)
 {
 	if (c == '\n')
@@ -84,6 +106,8 @@ void terminal_putchar(char c)
 		terminal_col = 0;
 		terminal_row = VGA_HEIGHT - 1;
 	}
+
+	terminal_update_cursor();
 }
 
 void terminal_write(const char* data, size_t size)
diff --git a/kernel/include/kernel/tty.h b/kernel/include/kernel/tty.h
index eb318d5f66..15f5fa7b79 100644
--- a/kernel/include/kernel/tty.h
+++ b/kernel/include/kernel/tty.h
@@ -8,3 +8,4 @@ void terminal_initialize();
 void terminal_putchar(char c);
 void terminal_write(const char* data, size_t size);
 void terminal_writestring(const char* data);
+void terminal_set_cursor_pos(int x, int y);
\ No newline at end of file