Introduce printf module, drop ARGTYPE_FORMAT
diff --git a/printf.h b/printf.h
new file mode 100644
index 0000000..983c951
--- /dev/null
+++ b/printf.h
@@ -0,0 +1,34 @@
+/*
+ * This file is part of ltrace.
+ * Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef PRINTF_H
+#define PRINTF_H
+
+#include <stddef.h>
+#include "forward.h"
+
+/* Wrapper around param_init_pack with callbacks to handle
+ * printf-style format strings. ARG should be an expression that
+ * evaluates to a pointer to a character array with the format string
+ * contents. */
+void param_pack_init_printf(struct param *param,
+ struct expr_node *arg, int own_arg);
+
+#endif /* PRINTF_H */