This is printf function for microcontroller from elm-chan.org.

Embedded String Functions - http://elm-chan.org/fsw/strf/xprintf.html

This is distributed as Open Source Software. See copyright notice below and
http://elm-chan.org/fsw_e.html.

/*------------------------------------------------------------------------/
/  Universal string handler for user console interface
/-------------------------------------------------------------------------/
/
/  Copyright (C) 2011, ChaN, all right reserved.
/
/ * This software is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-------------------------------------------------------------------------*/