feature: clear added to the shell

headers/shell.h

@@ -49,13 +49,14 @@ typedef enum {
 	POWEROFF,
 	HALT,
 	STACK,
+	CLEAR,
 	ECHO,
 	COLOR,
 	MERDELLA,
 	ERROR
 } CMD_TOK;
 
+void shell_init(void);
 void reboot(void);
 void halt(void);
-void shell_init(void);
 void print_stack(void);

headers/terminal.h

@@ -46,6 +46,7 @@ int terminal_write(const char *data, size_t size);
 int terminal_writestring(const char *data);
 int terminal_writelong(long number);
 void terminal_set_screen(int pos);
+void terminal_clear(void);
 struct key_event terminal_getkey(void);
 void update_cursor(void);
 void move_cursor(int direction);

src/shell/exec.c

@@ -31,6 +31,8 @@ static CMD_TOK find_command(char *line)
 		command = HALT;
 	else if (!strcmp(line, "stack"))
 		command = STACK;
+	else if (!strcmp(line, "clear"))
+		command = CLEAR;
 	else if (!strcmp(line, "echo"))
 		command = ECHO;
 	else if (!strcmp(line, "color"))
@@ -100,6 +102,9 @@ void shell_init(void)
 		case STACK:
 			print_stack();
 			break;
+		case CLEAR:
+			terminal_clear();
+			break;
 		case ECHO:
 			kprintf(0, "echoing\n");
 			break;

src/terminal/put.c

@@ -76,6 +76,19 @@ static void terminal_new_line(void)
 		terminal_scroll();
 }
 
+void terminal_clear(void)
+{
+	for (size_t y = 0; y < VGA_HEIGHT; y++) {
+		for (size_t x = 0; x < VGA_WIDTH; x++) {
+			const size_t index = y * VGA_WIDTH + x;
+			TERM_BUF[index] = vga_entry(' ', VGA_COLOR_WHITE);
+		}
+	}
+	memcpy(screen->buffer, TERM_BUF, sizeof(screen->buffer));
+	screen->column = 0;
+	screen->row = 0;
+}
+
 int terminal_putchar(char c)
 {
 	if (c == '\r')