Meaty Skeleton: Difference between revisions

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@@ Line 393: / Line 393: @@
 	const size_t index = y * VGA_WIDTH + x;
 	terminal_buffer[index] = vga_entry(c, color);
+}
+void scroll(int line) {
+	int loop;
+	char c;
+	for(loop=line*(VGA_WIDTH*2)+0xB8000; loop<VGA_WIDTH*2; loop++)
+	{
+		c = *loop;
+		*(loop-(VGA_WIDTH*2)) = c;
+	}
+}
+void delete_last_line() {
+	int x, *ptr;
+	for(x=0; x<VGA_WIDTH*2; x++)
+	{
+		ptr = 0xB8000 + (VGA_WIDTH*2)*(VGA_HEIGHT-1) + x;
+		*ptr = 0;
+	}
 }
 void terminal_putchar(char c) {
+	int line;
 	unsigned char uc = c;
 	terminal_putentryat(uc, terminal_color, terminal_column, terminal_row);
 	if (++terminal_column == VGA_WIDTH) {
 		terminal_column = 0;
 		if (++terminal_row == VGA_HEIGHT)
+		{
-			terminal_row = 0;
+			for(line=1; line<=VGA_HEIGHT-1; line++)
+			{
+				scroll(line);
+			}
+			delete_last_line();
+			terminal_row = VGA_HEIGHT - 1;
+		}
 	}
 }

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