Keyboard getch() clear keyboard_buffer before reading

Author: scopeInfinity

src/drivers/keyboard/keyboard.c

@@ -139,7 +139,8 @@ unsigned char read_data_reply() {
 int keyboard_buffer[KEYBOARD_BUFFER_SIZE+3];
 
 void keyboard_scanner_handler_init();
-int keyboard_scanner_handle_buffer(int keyboard_buffer_queue[]);
+void keyboard_scanner_ascii_clear();
+int keyboard_scanner_handle_buffer();
 
 void keyboard_scanner_init() {
     ASSERT( queue_init(keyboard_buffer, KEYBOARD_BUFFER_SIZE) );
@@ -160,11 +161,12 @@ int keyboard_scanner_step() {
         queue_push(keyboard_buffer, out);
         qs++;
     }
-    keyboard_scanner_handle_buffer(keyboard_buffer);
+    keyboard_scanner_handle_buffer();
     return state_change;
 }
 
 char keyboard_get_key_pressed_blocking() {
+    keyboard_scanner_ascii_clear();
     while(!keyboard_scanner_ascii_is_available()) {
         keyboard_scanner_step();
     }

src/drivers/keyboard/scancode_handler.c

@@ -172,10 +172,15 @@ static const unsigned char KEYBOARD_ASCII_MAPH_OTHERS[] = {
 };
 
 static unsigned char KEYBOARD_ASCII_MAPPING[256];
+extern int keyboard_buffer[];
 static char last_ascii;
 static int last_ascii_available = 0;
 static char tmp_juggad_is_f0 = 0;
 
+void keyboard_scanner_ascii_clear() {
+    queue_clear(keyboard_buffer);
+}
+
 int keyboard_scanner_ascii_is_available() {
     return last_ascii_available;
 }
@@ -207,7 +212,7 @@ void keyboard_scanner_handler_init() {
     }
 }
 
-int keyboard_scanner_handle_buffer(int keyboard_buffer[]) {
+int keyboard_scanner_handle_buffer() {
     // For now just taking care of some of the key press and disgarding others.
     int len = queue_size(keyboard_buffer);
     if(len == 0) return 0;

src/lib/ds/queue.c

@@ -9,6 +9,12 @@ int queue_init(int container[], int size) {
     return 1;
 }
 
+void queue_clear(int container[]) {
+    int *back = &container[0];
+    int *front = &container[1];
+    *back = *front = -1;
+}
+
 int queue_push(int container[], int data) {
     int *back = &container[0];
     int *front = &container[1];

src/lib/ds/queue.h

@@ -4,6 +4,8 @@
 
 // Returns if the queue init is successful.
 int queue_init(int container[], int effective_size);
+// Clears the queue.
+void queue_clear(int container[]);
 // Returns if the push is successful.
 int queue_push(int container[], int data);
 // Returns if the push is successful.