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/*
* nghttp2 - HTTP/2 C Library
*
* Copyright (c) 2012 Tatsuhiro Tsujikawa
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "nghttp2_queue.h"
#include <string.h>
#include <assert.h>
void nghttp2_queue_init(nghttp2_queue *queue) {
queue->front = queue->back = NULL;
}
void nghttp2_queue_free(nghttp2_queue *queue) {
if (!queue) {
return;
} else {
nghttp2_queue_cell *p = queue->front;
while (p) {
nghttp2_queue_cell *next = p->next;
free(p);
p = next;
}
}
}
int nghttp2_queue_push(nghttp2_queue *queue, void *data) {
nghttp2_queue_cell *new_cell =
(nghttp2_queue_cell *)malloc(sizeof(nghttp2_queue_cell));
if (!new_cell) {
return NGHTTP2_ERR_NOMEM;
}
new_cell->data = data;
new_cell->next = NULL;
if (queue->back) {
queue->back->next = new_cell;
queue->back = new_cell;
} else {
queue->front = queue->back = new_cell;
}
return 0;
}
void nghttp2_queue_pop(nghttp2_queue *queue) {
nghttp2_queue_cell *front = queue->front;
assert(front);
queue->front = front->next;
if (front == queue->back) {
queue->back = NULL;
}
free(front);
}
void *nghttp2_queue_front(nghttp2_queue *queue) {
assert(queue->front);
return queue->front->data;
}
void *nghttp2_queue_back(nghttp2_queue *queue) {
assert(queue->back);
return queue->back->data;
}
int nghttp2_queue_empty(nghttp2_queue *queue) { return queue->front == NULL; }