serial Kernel panic

src/io/term/term.c

@@ -9,6 +9,7 @@ because this shitty implementation will be replaced one day by Flanterm
 #include <stddef.h>
 #include <kernel.h>
 #include "term.h"
+#include "mem/misc/utils.h"
 
 extern struct boot_context boot_ctx;
 
@@ -35,6 +36,8 @@ unsigned char* fb;
 
 struct limine_framebuffer* framebuffer;
 
+uint8_t lines_length[MAX_LINES];
+
 int term_init()
 {
 	// Get framebuffer address from Limine struct
@@ -87,10 +90,51 @@ static void erase_char(int px, int py)
 	}
 }
 
+static inline size_t term_max_lines(void)
+{
+	return framebuffer->height / FONT_HEIGHT;
+}
+
+void term_scroll()
+{
+	const size_t row_height = FONT_HEIGHT;
+	const size_t row_bytes  = framebuffer->pitch;
+	const size_t screen_rows = framebuffer->height;
+
+	// Move framebuffer up by one text row 
+	memmove(fb, fb + row_height * row_bytes, (screen_rows - row_height) * row_bytes);
+
+	// Clear last text row
+	size_t clear_start = (screen_rows - row_height) * row_bytes;
+	memset(fb + clear_start, 0, row_height * row_bytes);
+
+	// Shift line lengths by 1 (for backspace handling)
+	size_t max_lines = term_max_lines();
+	for (size_t i = 1; i < max_lines; i++)
+	{
+		lines_length[i - 1] = lines_length[i];
+	}
+
+	lines_length[max_lines - 1] = 0;
+
+	if (cursor.y > 0)
+	{
+		cursor.y--;
+	}
+}
+
+
 void putchar(char c)
 {
+	if ((c == '\n') && ((cursor.y+1)*FONT_HEIGHT >= framebuffer->height))
+	{
+		term_scroll();
+		return;
+	} 
+
 	if (c == '\n')
 	{
+		lines_length[cursor.y] = cursor.x;
 		cursor.x = 0;
 		cursor.y++;
 		return;
@@ -110,7 +154,8 @@ void putchar(char c)
 		if (cursor.x == 0)
 		{
 			cursor.y--;
-			cursor.x = (framebuffer->width / FONT_WIDTH) -1; // here
+			// cursor.x = (framebuffer->width / FONT_WIDTH) -1; // here
+			cursor.x = lines_length[cursor.y];
 		}
 		else {
 			cursor.x--;
@@ -128,6 +173,11 @@ void putchar(char c)
 		cursor.y++;
 	}
 
+	if ((cursor.y+1)*FONT_HEIGHT >= framebuffer->height)
+	{
+		term_scroll();
+	}
+
 	int px = cursor.x * FONT_WIDTH;
 	int py = cursor.y * FONT_HEIGHT;
 	draw_char(c, px, py, WHITE, BLACK);