/*
 * pua module - presence user agent module
 *
 * Copyright (C) 2007 Voice Sistem S.R.L.
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */


#include "../../core/dprint.h"
#include "../../core/error.h"
#include "../../core/mem/shm_mem.h"
#include "pua_callback.h"


struct puacb_head_list *puacb_list = 0;

int init_puacb_list(void)
{
	puacb_list = (struct puacb_head_list *)shm_malloc(
			sizeof(struct puacb_head_list));
	if(puacb_list == 0) {
		SHM_MEM_ERROR;
		return -1;
	}
	puacb_list->first = 0;
	puacb_list->reg_types = 0;
	return 1;
}


void destroy_puacb_list(void)
{
	struct pua_callback *cbp, *cbp_tmp;

	if(!puacb_list)
		return;

	for(cbp = puacb_list->first; cbp;) {
		cbp_tmp = cbp;
		cbp = cbp->next;
		if(cbp_tmp->param)
			shm_free(cbp_tmp->param);
		shm_free(cbp_tmp);
	}
	shm_free(puacb_list);
}


/* register a callback function 'f' for 'types' mask of events;
*/
int register_puacb(int types, pua_cb f, void *param)
{
	struct pua_callback *cbp;

	/* are the callback types valid?... */
	if(types < 0 || types > PUACB_MAX) {
		LM_CRIT("invalid callback types: mask=%d\n", types);
		return E_BUG;
	}
	/* we don't register null functions */
	if(f == 0) {
		LM_CRIT("null callback function\n");
		return E_BUG;
	}

	/* build a new callback structure */
	if(!(cbp = (struct pua_callback *)shm_malloc(
				 sizeof(struct pua_callback)))) {
		SHM_MEM_ERROR;
		return E_OUT_OF_MEM;
	}

	/* link it into the proper place... */
	cbp->next = puacb_list->first;
	puacb_list->first = cbp;
	puacb_list->reg_types |= types;

	cbp->callback = f;
	cbp->param = param;
	cbp->types = types;
	if(cbp->next)
		cbp->id = cbp->next->id + 1;
	else
		cbp->id = 0;

	return 1;
}
