kernel/include/stdarg.h

   1 /*
   2  *  ZeX/OS
   3  *  Copyright (C) 2007  Tomas 'ZeXx86' Jedrzejek (zexx86@zexos.org)
   4  *
   5  *  This program is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19
  20 #ifndef __TL_STDARG_H
  21 #define __TL_STDARG_H
  22
  23 #include <_va_list.h>
  24
  25 /* width of stack == width of int */
  26 #define STACKITEM       int
  27
  28 /* round up width of objects pushed on stack. The expression before the
  29 & ensures that we get 0 for objects of size 0. */
  30 #define VA_SIZE(TYPE)                                   \
  31         ((sizeof(TYPE) + sizeof(STACKITEM) - 1) \
  32                 & ~(sizeof(STACKITEM) - 1))
  33
  34 /* &(LASTARG) points to the LEFTMOST argument of the function call
  35 (before the ...) */
  36 #define va_start(AP, LASTARG)   \
  37         (AP=((va_list)&(LASTARG) + VA_SIZE(LASTARG)))
  38
  39 #define va_end(AP)      /* nothing */
  40
  41 #define va_arg(AP, TYPE)        \
  42         (AP += VA_SIZE(TYPE), *((TYPE *)(AP - VA_SIZE(TYPE))))
  43
  44 #endif
  45