uspace/libc/arch/ia32/include/stackarg.h

   1 /*
   2  * Copyright (C) 2005 Jakub Jermar
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup libcia32
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 /*
  36  * Variable argument list manipulation macros
  37  * for architectures using stack to pass arguments.
  38  */
  39
  40 #ifndef LIBC_ia32_STACKARG_H_
  41 #define LIBC_ia32_STACKARG_H_
  42
  43 #include <types.h>
  44
  45 /* dont allow to define it second time in stdarg.h */
  46 #define __VARARGS_DEFINED
  47
  48 typedef struct va_list {
  49         int pos;
  50         uint8_t *last;
  51 } va_list;
  52
  53 #define va_start(ap, lst) \
  54         (ap).pos = sizeof(lst);                         \
  55         (ap).last = (uint8_t *) &(lst)
  56
  57 #define va_arg(ap, type)                \
  58         (*((type *)((ap).last + ((ap).pos  += sizeof(type) ) - sizeof(type))))
  59
  60 #define va_end(ap)
  61
  62
  63 #endif
  64
  65 /** @}
  66  */