Implemented a software cursor of sorts and updated the function that draws a string to honor that cursor position.

build_numbers.c

@@ -1,3 +1,3 @@
 #ifndef KERNEL_VERSION_NUMBER
-#define KERNEL_VERSION_NUMBER "0.0.1-276"
+#define KERNEL_VERSION_NUMBER "0.0.1-293"
 #endif

kernel/kmain.c

@@ -11,6 +11,14 @@ void kmain()
 	draw_rect(10, 5, 15, 13, 0x8, 0x6);
 	draw_rect(20, 5, 25, 7, 0xF, 0x1);
 	draw_rect(20, 8, 25, 13, 0x5, 0x3);
+	set_cursor(0, 14);
+	move_cursor(0, 14);
+	move_cursor(0, 15);
+	draw_s("Test print", 0x8, 0xF);
+	move_cursor(0, 16);
+	draw_s("And now the cursor has been moved to y = 16.", 0x1, 0xF);
+	move_cursor(5, 20);
+	draw_s("Cursor moved over 5 cells and down 4 cells.", 0xF, 0x0);
 	//draw_rect(20, 5, 50, 7, 0x4, 0xF);
 	//draw_rect(20, 5, 50, 7, 0x4, 0xF);
 	//draw_rect(20, 5, 50, 7, 0x4, 0xF);
@@ -30,6 +38,7 @@ void write_screen(unsigned int i, char c, unsigned char fg, unsigned char bg)
 
 void move(unsigned short pos)
 {
+	
 	outb(0x3D4, 14);
 	outb(0x3D5, ((pos >> 8 ) & 0x00FF));
 	outb(0x3D4, 15);

kernel/screen.c

@@ -1,9 +1,11 @@
 #include "../includes/screen.h"
 #include "../build_numbers.c"
 
-unsigned char row = 1;
-unsigned char column = 0;
+unsigned char cursor_x = 0;
+unsigned char cursor_y = 0;
 unsigned char screen_width = 80;
+char column = -1;
+unsigned char row = 0;
 
 
 void print_banner(){
@@ -55,32 +57,43 @@ void draw_rect(int start_x, int start_y, int end_x, int end_y, unsigned char fg,
 	for(unsigned char i = 0; i < y; i++){
 		for(unsigned char j = 0; j < x; j++){
 			unsigned short *where = (unsigned short*) buffer + (i * 80) + j;
-			*where =  0x23 | (attr << 8);
+			*where =  ' ' | (attr << 8);
 		}
 	}
 }
 
 void draw_s(char* string, unsigned char fg, unsigned char bg)
 {
-	char *video_buffer = 0x000B8000;
-	
+	unsigned short *video_buffer = 0x000B8000;
+	int attr = ((bg << 4) | (fg & 0x0F));
 	for(int i = 0; i < strlen(string); i++)
 	{
-		char current_char = string[i];
+		unsigned char current_char = string[i];
+		unsigned short *where = (unsigned short *) video_buffer + (cursor_y * 80) + i + cursor_x;
 		
 		if(current_char == '\n'){
-			//row++;
-			column = row * column;
-			row++;
+			cursor_y++;
 			continue;
 		}
 		
-		video_buffer[i*2 + (row * column)] = string[i];
-		video_buffer[i * 2 + 1 + (row * column)] = ((fg & 0x0f) << 4) | (bg & 0x0F);
-		//column++;
+		*where = string[i] | attr << 8;
 	}
 }
 
+void set_cursor(unsigned char x, unsigned char y){
+	cursor_x = x;
+	cursor_y = y;
+}
+
+void move_cursor(unsigned char x, unsigned char y){
+	if(column != -1) draw_rect(cursor_x, cursor_y, cursor_x + 1, cursor_y + 1, 0x2, 0x8);
+	
+	cursor_x = x;
+	cursor_y = y;
+	
+	draw_rect(x, y, x + 1, y + 1, 0x0, 0xF);
+}
+
 void clear_screen(){
 	char *video_buffer = 0x000B8000;