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      1 /* $NetBSD: prop_stack.h,v 1.2 2007/08/30 12:23:54 joerg Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2007 Joerg Sonnenberger <joerg (at) NetBSD.org>.
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  *
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in
     15  *    the documentation and/or other materials provided with the
     16  *    distribution.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
     22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #ifndef _PROP_STACK_H
     33 #define _PROP_STACK_H
     34 
     35 #include <sys/queue.h>
     36 
     37 #include <prop/prop_object.h>
     38 
     39 struct _prop_stack_intern_elem {
     40 	prop_object_t object;
     41 	void *object_data[3];
     42 };
     43 
     44 struct _prop_stack_extern_elem {
     45 	SLIST_ENTRY(_prop_stack_extern_elem) stack_link;
     46 	prop_object_t object;
     47 	void *object_data[3];
     48 };
     49 
     50 #define	PROP_STACK_INTERN_ELEMS	16
     51 
     52 struct _prop_stack {
     53 	struct _prop_stack_intern_elem intern_elems[PROP_STACK_INTERN_ELEMS];
     54 	size_t used_intern_elems;
     55 	SLIST_HEAD(, _prop_stack_extern_elem) extern_elems;
     56 };
     57 
     58 typedef struct _prop_stack *prop_stack_t;
     59 
     60 void	_prop_stack_init(prop_stack_t);
     61 bool	_prop_stack_push(prop_stack_t, prop_object_t, void *, void *, void *);
     62 bool	_prop_stack_pop(prop_stack_t, prop_object_t *, void **, void **, void **);
     63 
     64 #endif
     65