IO primitives

stdlib/ktSrc/StandardLibrary.kt

@@ -1,5 +1,39 @@
 namespace std
 
-fun println(message : Any?) {
+namespace io {
+  import java.io.*
+
+  fun print(message : Any?) { System.out?.print(message) }
+  fun print(message : Int) { System.out?.print(message) }
+  fun print(message : Long) { System.out?.print(message) }
+  fun print(message : Byte) { System.out?.print(message) }
+  fun print(message : Short) { System.out?.print(message) }
+  fun print(message : Char) { System.out?.print(message) }
+  fun print(message : Boolean) { System.out?.print(message) }
+  fun print(message : Float) { System.out?.print(message) }
+  fun print(message : Double) { System.out?.print(message) }
+
+  fun println(message : Any?) {
     System.out?.println(message)
+  }
+
+  fun println(message : Int) { System.out?.println(message) }
+  fun println(message : Long) { System.out?.println(message) }
+  fun println(message : Byte) { System.out?.println(message) }
+  fun println(message : Short) { System.out?.println(message) }
+  fun println(message : Char) { System.out?.println(message) }
+  fun println(message : Boolean) { System.out?.println(message) }
+  fun println(message : Float) { System.out?.println(message) }
+  fun println(message : Double) { System.out?.println(message) }
+
+  private var systemIn : InputStream? = null // Unfortunately, System.in may change
+  private var stdin : BufferedReader? = null // This may introduce leaks of system.in objects...
+
+  fun readLine() : String? {
+    if (stdin == null || systemIn != System.`in`) {
+        stdin = java.io.BufferedReader(java.io.InputStreamReader(System.`in`))
+        systemIn = System.`in`
+    }
+    return stdin?.readLine()
+  }
 }