Prepare non-canonical mode

kernel/include/terminal.hpp

@@ -24,6 +24,7 @@ struct virtual_terminal {
 
     circular_buffer<char, INPUT_BUFFER_SIZE> input_buffer;
     circular_buffer<char, 2 * INPUT_BUFFER_SIZE> canonical_buffer;
+    circular_buffer<size_t, 3 * INPUT_BUFFER_SIZE> raw_buffer;
 
     sleep_queue input_queue;
 
@@ -38,6 +39,12 @@ struct virtual_terminal {
      */
     size_t read_input_can(char* buffer, size_t max);
 
+    /*!
+     * \brief Reads non-canonical input in the given buffer
+     * \return the keyboard scan code
+     */
+    size_t read_input_raw();
+
     virtual_terminal(){}
 
     virtual_terminal(const virtual_terminal& rhs) = delete;

kernel/src/terminal.cpp

@@ -71,7 +71,13 @@ void stdio::virtual_terminal::send_input(char key){
             }
         }
     } else {
-        //TODO
+        // The complete processing of the key will be done by the
+        // userspace program
+        raw_buffer.push(key);
+
+        if(!input_queue.empty()){
+            input_queue.wake_up();
+        }
     }
 }
 
@@ -93,6 +99,14 @@ size_t stdio::virtual_terminal::read_input_can(char* buffer, size_t max){
     }
 }
 
+size_t stdio::virtual_terminal::read_input_raw(){
+    if(raw_buffer.empty()){
+        input_queue.sleep();
+    }
+
+    return raw_buffer.pop();
+}
+
 void stdio::init_terminals(){
     for(size_t i  = 0; i < MAX_TERMINALS; ++i){
         auto& terminal = terminals[i];