Master

Modified in the following ways:

• added functionality to handle newline character.
• added functionality to scroll
• added iteration of strings using different colors.

kernel.c

@@ -85,7 +85,28 @@ void terminal_putentryat(char c, uint8_t color, size_t x, size_t y) {
 }
 
 void terminal_putchar(char c) {
-  terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
+	if (c == '\n'){
+		terminal_column = 0;
+		if (++terminal_row == VGA_HEIGHT){
+			/*terminal_row = 0;*/
+			terminal_row = VGA_HEIGHT - 1;
+			/*Perform scrolling by moving each row up by one*/
+			for (size_t y = 1;y < VGA_HEIGHT; y++){
+				for (size_t x = 0; x < VGA_WIDTH; x++){
+					size_t prev_index = (y - 1) * VGA_WIDTH + x;
+					size_t curr_index = y * VGA_WIDTH + x;
+					terminal_buffer[prev_index] = terminal_buffer[curr_index];
+}
+}
+			/*Clear the last row*/
+			size_t last_row_index = (VGA_HEIGHT - 1) * VGA_WIDTH;
+			for (size_t x = 0; x < VGA_WIDTH; x++) {
+			terminal_buffer[last_row_index + x] = make_vgaentry(' ',terminal_color);
+}
+}
+
+}else{
+	terminal_putentryat(c, terminal_color, terminal_column, terminal_row);
   if (++terminal_column == VGA_WIDTH) {
     terminal_column = 0;
     if (++terminal_row == VGA_HEIGHT) {
@@ -93,6 +114,9 @@ void terminal_putchar(char c) {
     }
   }
 }
+	
+  
+}
  
 void terminal_writestring(const char* data) {
   size_t datalen = strlen(data);
@@ -111,5 +135,27 @@ void kernel_main() {
    * yet, '\n' will produce some VGA specific character instead.
    * This is normal.
    */
-  terminal_writestring("Hello, kernel World!\n");
+
+/*Outputs "Hello World" in red once */
+terminal_setcolor(make_color(COLOR_RED, COLOR_BLACK));
+terminal_writestring("Hello, kernel World!\n");
+
+/*Outputs "Hello World" in white 6 times */
+terminal_setcolor(make_color(COLOR_WHITE, COLOR_BLACK));
+for (int i = 0; i < 6; i++){
+	terminal_writestring("Hello, kernel World!\n");
+}
+
+/*Outputs "Hello World" in blue 18 times */
+terminal_setcolor(make_color(COLOR_BLUE, COLOR_BLACK));
+for (int i = 0; i < 18; i++){
+	terminal_writestring("Hello, kernel World!\n");
+}
+
+/*Outputs "Hello World" in green 5 times */
+terminal_setcolor(make_color(COLOR_GREEN, COLOR_BLACK));
+for (int i = 0; i < 5; i++){
+	terminal_writestring("Hello, kernel World!\n");
+}
+
 }