xarg.h

/*******************************************************************************
    Copyright 2014 Matthew Thiffault

    This file is part of HeatheRTOS.

    HeatheRTOS 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.

    HeatheRTOS 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 HeatheRTOS.  If not, see <http://www.gnu.org/licenses/>.

*******************************************************************************/

#ifndef XARG_H
#define XARG_H

/* Typedef for the argument list */
typedef char *va_list;

#define __va_argsiz(t) \
    (((sizeof(t) + sizeof(int) - 1) / sizeof(int)) * sizeof(int))

/* Start getting the arugment list */
#define va_start(ap, pN) \
    ((ap) = ((va_list) __builtin_next_arg(pN)))

/* Finish getting the argument list */
#define va_end(ap) \
    ((void)0)

/* Get an argument from the argument list */
#define va_arg(ap, t) \
    (((ap) = (ap) + __va_argsiz(t)), *((t*) (void*) ((ap) - __va_argsiz(t))))

#endif