+extern int model_err;
+extern int switch_alloc;
+
+#define model_dprintf(fd, fmt, ...) do { switch_alloc = 1; dprintf(fd, fmt, ##__VA_ARGS__); switch_alloc = 0; } while (0)
+
+#define model_print(fmt, ...) do { model_dprintf(model_out, fmt, ##__VA_ARGS__); } while (0)
+
+#define model_print_err(fmt, ...) do { model_dprintf(model_err, fmt, ##__VA_ARGS__); } while (0)
+