1 files changed, 45 insertions, 0 deletions

diff --git a/firmware/include/vuprintf.h b/firmware/include/vuprintf.h
new file mode 100644
index 0000000000..3876482fb2
--- /dev/null
+++ b/firmware/include/vuprintf.h
@@ -0,0 +1,45 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2002 by Felix Arends
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#ifndef __VUPRINTF_H__
+#define __VUPRINTF_H__
+
+#include <stdarg.h>
+
+/* callback function is called for every output character (byte) in the
+ * output with userp
+ *
+ * it must return > 0 to continue (increments counter)
+ * it may return 0 to stop (increments counter)
+ * it may return < 0 to stop (does not increment counter)
+ * a zero in the format string stops (does not increment counter)
+ *
+ * caller is reponsible for stopping formatting in order to keep the return
+ * value from overflowing (assuming they have a reason to care)
+ */
+typedef int (* vuprintf_push_cb)(void *userp, int c);
+
+/*
+ * returns the number of times push() was called and returned >= 0
+ */
+int vuprintf(vuprintf_push_cb push, void *userp, const char *fmt, va_list ap);
+
+#endif /* __VUPRINTF_H__ */