/* $NetBSD: prop_stack.h,v 1.2 2007/08/30 12:23:54 joerg Exp $ */

/*-
* Copyright (c) 2007 Joerg Sonnenberger <[email protected]>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef _PROP_STACK_H
#define _PROP_STACK_H

#include <sys/queue.h>

#include <prop/prop_object.h>

struct _prop_stack_intern_elem {
       prop_object_t object;
       void *object_data[3];
};

struct _prop_stack_extern_elem {
       SLIST_ENTRY(_prop_stack_extern_elem) stack_link;
       prop_object_t object;
       void *object_data[3];
};

#define PROP_STACK_INTERN_ELEMS 16

struct _prop_stack {
       struct _prop_stack_intern_elem intern_elems[PROP_STACK_INTERN_ELEMS];
       size_t used_intern_elems;
       SLIST_HEAD(, _prop_stack_extern_elem) extern_elems;
};

typedef struct _prop_stack *prop_stack_t;

void    _prop_stack_init(prop_stack_t);
bool    _prop_stack_push(prop_stack_t, prop_object_t, void *, void *, void *);
bool    _prop_stack_pop(prop_stack_t, prop_object_t *, void **, void **, void **);

#endif