common/lib/libprop/prop_stack.h

   1 /* $NetBSD: prop_stack.h,v 1.1 2007/08/16 21:44:08 joerg Exp $ */
   2
   3 /*-
   4  * Copyright (c) 2007 Joerg Sonnenberger <joerg@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