feat(idt): use new ring_buffer functions

k/pic/keyboard.c

@@ -1,12 +1,20 @@
 #include "pic/keyboard.h"
 #include "io.h"
-#include "stdio.h"
+#include "utils/ring_buffer.h"
 
-int8_t getkey(void)
+static struct ring_buffer keyboard_buffer = { 0 };
+
+void add_key_to_buffer(void)
 {
     uint8_t key = inb(KEYBOARD_IO);
+    write_entry(&keyboard_buffer, key);
+}
 
-    if (key & KEYBOARD_RELEASE)
+int getkey(void)
+{
+    uint8_t key = read_entry(&keyboard_buffer);
+
+    if (!key)
         return -1;
 
     return key;

k/pic/keyboard.h

@@ -8,6 +8,7 @@
 
 #include <stdint.h>
 
-int8_t getkey(void);
+void add_key_to_buffer(void);
+int getkey(void);
 
 #endif /* !KEYBOARD_H */