From 1f90fb5825890dfbf74e5aea46779645ebc453b9 Mon Sep 17 00:00:00 2001
From: Ruslan Isaev <ubijca16@gmail.com>
Date: Thu, 20 Nov 2025 20:12:52 +0300
Subject: [PATCH] screen: implement cursor positioning

---
 include/screen.h     |  1 +
 src/drivers/screen.c | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/screen.h b/include/screen.h
index f71810c..cf5ce05 100644
--- a/include/screen.h
+++ b/include/screen.h
@@ -39,5 +39,6 @@ void terminal_putentryat(char c, uint8_t color, size_t x, size_t y);
 void terminal_putchar(char c);
 void terminal_write(const char* data, size_t size);
 void terminal_writestring(const char* data);
+void update_cursor(int x, int y);
 
 #endif
diff --git a/src/drivers/screen.c b/src/drivers/screen.c
index 5d6302e..4436cc9 100644
--- a/src/drivers/screen.c
+++ b/src/drivers/screen.c
@@ -1,6 +1,7 @@
 // screen.c
 #include "../include/screen.h"
 #include "../include/string.h"
+#include "../include/utils.h"
 
 static size_t terminal_row;
 static size_t terminal_column;
@@ -83,6 +84,7 @@ void terminal_putchar(char c)
 		if (c == 'H') {
 			terminal_row = 0;
 			terminal_column = 0;
+			update_cursor(0, 0);
 		}
 		terminal_state = STATE_NORMAL;
 		return;
@@ -109,6 +111,7 @@ void terminal_putchar(char c)
 	if (terminal_row >= VGA_HEIGHT) {
 		terminal_scroll();
 	}
+	update_cursor(terminal_column, terminal_row);
 }
 
 void terminal_write(const char* data, size_t size) 
@@ -121,3 +124,13 @@ void terminal_writestring(const char* data)
 {
         terminal_write(data, strlen(data));
 }
+
+void update_cursor(int x, int y)
+{
+	uint16_t pos = y * VGA_WIDTH + x;
+
+	outb(0x3D4, 0x0F);
+	outb(0x3D5, (uint8_t) (pos & 0xFF));
+	outb(0x3D4, 0x0E);
+	outb(0x3D5, (uint8_t) ((pos >> 8) & 0xFF));
+}
\ No newline at end of file