stdarg.h

Simple Operating Systems （简称SOS）是一个可以运行在X86平台上（包括QEMU

/* Copyright (C) 2003  The KOS Team
   Copyright (C) 1999  Free Software Foundation

   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
   USA. 
*/
#ifndef _SOS_LIBC_STDARG_H_
#define _SOS_LIBC_STDARG_H_

#include <types.h>

/**
 * @file stdarg.h
 */

/* Borrowed from GCC */
#define __GNUC_VA_LIST 
typedef void *__gnuc_va_list;
typedef __gnuc_va_list va_list;
#define __va_rounded_size(TYPE) \
  (((sizeof (TYPE) + sizeof (int) - 1) / sizeof (int)) * sizeof (int))
#define va_start(AP, LASTARG) \
  (AP = ((__gnuc_va_list) __builtin_next_arg (LASTARG)))
#define va_end(AP) \
  ((void)0)
#define va_arg(AP, TYPE) \
  (AP = (__gnuc_va_list) ((char *) (AP) + __va_rounded_size (TYPE)),  \
   *((TYPE *) (void *) ((char *) (AP) - __va_rounded_size (TYPE))))
#define __va_copy(dest, src) \
  (dest) = (src)

/* stdarg.h functions. There might be a non-standard behavior: there
   will always be a trailing '\0' in the resulting string */
int vsnprintf(char *, size_t, const char *, va_list);
int snprintf(char *, size_t, const char *, /*args*/ ...)
  __attribute__ ((format (printf, 3, 4)));

#endif /* _SOS_LIBC_STDARG_H_ */