Really fix read_string.

src/vm/virtual_machine.cc

@@ -500,14 +500,13 @@ namespace vm
       case 8:
 	{
 	  int i = 0;
-	  for (; i < cpu.get_a(1); ++i)
+	  int c = 0;
+	  for (; (i < cpu.get_a(1) - 1) && (c != '\n') && (c != '\r') ; ++i)
 	    {
-	      int	c = std::cin.get();
+	      c = std::cin.get();
 	      if (std::cin.eof())
 		break;
 	      _memory.store_byte(cpu.get_a(0) + i, c);
-	      if (c == '\n' || c == '\r')
-		break;
 	    }
 	  _memory.store_byte(cpu.get_a(0) + i, 0);
 	}