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/*
* This file is part of the PCEPlib, a PCEP protocol library.
*
* Copyright (C) 2020 Volta Networks https://voltanet.io/
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* Author : Brady Johnson <brady@voltanet.io>
*
*/
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include "pcep_utils_logging.h"
#include "pcep_utils_memory.h"
#include "pcep_utils_queue.h"
queue_handle *queue_initialize()
{
/* Set the max_entries to 0 to disable it */
return queue_initialize_with_size(0);
}
queue_handle *queue_initialize_with_size(unsigned int max_entries)
{
queue_handle *handle =
pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_handle));
memset(handle, 0, sizeof(queue_handle));
handle->max_entries = max_entries;
return handle;
}
void queue_destroy(queue_handle *handle)
{
if (handle == NULL) {
pcep_log(
LOG_DEBUG,
"%s: queue_destroy, the queue has not been initialized",
__func__);
return;
}
while (queue_dequeue(handle) != NULL) {
}
pceplib_free(PCEPLIB_INFRA, handle);
}
void queue_destroy_with_data(queue_handle *handle)
{
if (handle == NULL) {
pcep_log(
LOG_DEBUG,
"%s: queue_destroy_with_data, the queue has not been initialized",
__func__);
return;
}
void *data = queue_dequeue(handle);
while (data != NULL) {
pceplib_free(PCEPLIB_INFRA, data);
data = queue_dequeue(handle);
}
pceplib_free(PCEPLIB_INFRA, handle);
}
queue_node *queue_enqueue(queue_handle *handle, void *data)
{
if (handle == NULL) {
pcep_log(
LOG_DEBUG,
"%s: queue_enqueue, the queue has not been initialized",
__func__);
return NULL;
}
if (handle->max_entries > 0
&& handle->num_entries >= handle->max_entries) {
pcep_log(
LOG_DEBUG,
"%s: queue_enqueue, cannot enqueue: max entries hit [%u]",
handle->num_entries);
return NULL;
}
queue_node *new_node =
pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_node));
memset(new_node, 0, sizeof(queue_node));
new_node->data = data;
new_node->next_node = NULL;
(handle->num_entries)++;
if (handle->head == NULL) {
/* its the first entry in the queue */
handle->head = handle->tail = new_node;
} else {
handle->tail->next_node = new_node;
handle->tail = new_node;
}
return new_node;
}
void *queue_dequeue(queue_handle *handle)
{
if (handle == NULL) {
pcep_log(
LOG_DEBUG,
"%s: queue_dequeue, the queue has not been initialized",
__func__);
return NULL;
}
if (handle->head == NULL) {
return NULL;
}
void *node_data = handle->head->data;
queue_node *node = handle->head;
(handle->num_entries)--;
if (handle->head == handle->tail) {
/* its the last entry in the queue */
handle->head = handle->tail = NULL;
} else {
handle->head = node->next_node;
}
pceplib_free(PCEPLIB_INFRA, node);
return node_data;
}
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