Keyboard buffer + getline

include/io/kbd/ps2.h

@@ -7,7 +7,12 @@
 #ifndef PS2_H
 #define PS2_H
 
+#include <stddef.h>
+
 void keyboard_handler(void);
+char keyboard_getchar();
+int keyboard_putchar(char c);
+int keyboard_getline(char* output, size_t size);
 
 #define SHIFT_PRESSED_BIT 0b00000001
 #define ALT_PRESSED_BIT   0b00000010