ConsoleDevice: Use a temporary buffer for backspace handling

kernel/src/fs/devices/ConsoleDevice.cpp

@@ -2,6 +2,7 @@
 #include "video/TextConsole.h"
 #include <luna/Buffer.h>
 #include <luna/CString.h>
+#include <luna/Vector.h>
 
 static Buffer g_console_input;
 
@@ -34,7 +35,24 @@ bool ConsoleDevice::blocking() const
     return g_console_input.size() == 0;
 }
 
+static Vector<u8> g_temp_input;
+
 void ConsoleDevice::did_press_key(char key)
 {
-    *g_console_input.slice_at_end(1).value() = (u8)key;
+    if (key == '\b')
+    {
+        if (g_temp_input.try_pop().has_value()) TextConsole::putwchar(L'\b');
+
+        return;
+    }
+
+    g_temp_input.try_append(key).value();
+
+    if (key == '\n')
+    {
+        g_console_input.append_data(g_temp_input.data(), g_temp_input.size()).value();
+        g_temp_input.clear();
+    }
+
+    TextConsole::putchar(key);
 }