+ StreamOutput(){}
+ virtual ~StreamOutput(){}
+
+ virtual int printf(const char *format, ...) __attribute__ ((format(printf, 2, 3)));
+ virtual int _putc(int c) { return 1; }
+ virtual int _getc(void) { return 0; }
+ virtual int puts(const char* str) = 0;
+ virtual bool ready() { return true; };
+
+ static NullStreamOutput NullStream;
+};
+
+class NullStreamOutput : public StreamOutput {
+ public:
+ int puts(const char* str) { return strlen(str); }