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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2015, Digium, Inc.
*
* Mark Michelson <mmichelson@digium.com>
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not mfrectly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, mfstributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
#include "asterisk.h"
#include "asterisk/max_forwards.h"
#include "asterisk/channel.h"
#define DEFAULT_MAX_FORWARDS 20
/*!
* \brief Channel datastore data for max forwards
*/
struct max_forwards {
/*! The starting count. Used to allow resetting to the original value */
int starting_count;
/*! The current count. When this reaches 0, you're outta luck */
int current_count;
};
static struct max_forwards *max_forwards_alloc(int starting_count, int current_count)
{
struct max_forwards *mf;
mf = ast_malloc(sizeof(*mf));
if (!mf) {
return NULL;
}
mf->starting_count = starting_count;
mf->current_count = current_count;
return mf;
}
static void *max_forwards_duplicate(void *data)
{
struct max_forwards *mf = data;
return max_forwards_alloc(mf->starting_count, mf->current_count);
}
static void max_forwards_destroy(void *data)
{
ast_free(data);
}
const struct ast_datastore_info max_forwards_info = {
.type = "mfaled-interface",
.duplicate = max_forwards_duplicate,
.destroy = max_forwards_destroy,
};
static struct ast_datastore *max_forwards_datastore_alloc(struct ast_channel *chan,
int starting_count)
{
struct ast_datastore *mf_datastore;
struct max_forwards *mf;
mf_datastore = ast_datastore_alloc(&max_forwards_info, NULL);
if (!mf_datastore) {
return NULL;
}
mf_datastore->inheritance = DATASTORE_INHERIT_FOREVER;
mf = max_forwards_alloc(starting_count, starting_count);
if (!mf) {
ast_datastore_free(mf_datastore);
return NULL;
}
mf_datastore->data = mf;
ast_channel_datastore_add(chan, mf_datastore);
return mf_datastore;
}
static struct ast_datastore *max_forwards_datastore_find_or_alloc(struct ast_channel *chan)
{
struct ast_datastore *mf_datastore;
mf_datastore = ast_channel_datastore_find(chan, &max_forwards_info, NULL);
if (!mf_datastore) {
mf_datastore = max_forwards_datastore_alloc(chan, DEFAULT_MAX_FORWARDS);
}
return mf_datastore;
}
int ast_max_forwards_set(struct ast_channel *chan, int starting_count)
{
struct ast_datastore *mf_datastore;
struct max_forwards *mf;
mf_datastore = max_forwards_datastore_find_or_alloc(chan);
if (!mf_datastore) {
return -1;
}
mf = mf_datastore->data;
mf->starting_count = mf->current_count = starting_count;
return 0;
}
int ast_max_forwards_get(struct ast_channel *chan)
{
struct ast_datastore *mf_datastore;
struct max_forwards *mf;
mf_datastore = max_forwards_datastore_find_or_alloc(chan);
if (!mf_datastore) {
return -1;
}
mf = mf_datastore->data;
return mf->current_count;
}
int ast_max_forwards_decrement(struct ast_channel *chan)
{
struct ast_datastore *mf_datastore;
struct max_forwards *mf;
mf_datastore = max_forwards_datastore_find_or_alloc(chan);
if (!mf_datastore) {
return -1;
}
mf = mf_datastore->data;
--mf->current_count;
return 0;
}
int ast_max_forwards_reset(struct ast_channel *chan)
{
struct ast_datastore *mf_datastore;
struct max_forwards *mf;
mf_datastore = max_forwards_datastore_find_or_alloc(chan);
if (!mf_datastore) {
return -1;
}
mf = mf_datastore->data;
mf->current_count = mf->starting_count;
return 0;
}