working io.read from STDIN

Former-commit-id: b1168a53fd5fbd09c6a5a76506402560fc4e0fd7
Former-commit-id: a0d455da14a6eb7bf0127e136949273ec5a28628

src/net/torvald/terrarum/virtualcomputer/terminal/GraphicsTerminal.kt

@@ -206,6 +206,8 @@ class GraphicsTerminal(private val host: TerrarumComputer) : Terminal {
             )
             (0..displacement - 1).forEach { rgba[it] = 0.toByte() }
         }
+
+        cursorY += -amount
     }
 
     /**

src/net/torvald/terrarum/virtualcomputer/terminal/TerminalInputStream.kt

@@ -8,35 +8,16 @@ import java.io.InputStream
  */
 class TerminalInputStream(val host: TerrarumComputer) : InputStream() {
 
-    private val pauseLock = java.lang.Object()
-
     override fun read(): Int {
-        System.err.println("TerminalInputStream.read called")
-
         //System.err.println(Thread.currentThread().name)
         // would display "LuaJ Separated", which means this InputStream will not block main thread
 
-
         host.openStdin()
-
-
         synchronized(this) {
             (this as java.lang.Object).wait()
         }
 
-        System.err.println("TerminalInputStream.read exit")
-
-
-
         return host.stdinInput
     }
 
-    override fun read(b: ByteArray?): Int {
-        TODO()
-    }
-
-    override fun read(b: ByteArray?, off: Int, len: Int): Int {
-        TODO()
-    }
-
 }