2 * Dropbear - a SSH2 server
4 * Copyright (c) 2002,2003 Matt Johnston
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
29 void initqueue(struct Queue* queue) {
36 int isempty(struct Queue* queue) {
38 return (queue->head == NULL);
41 void* dequeue(struct Queue* queue) {
45 assert(!isempty(queue));
47 ret = queue->head->item;
48 oldhead = queue->head;
50 if (oldhead->link != NULL) {
51 queue->head = oldhead->link;
55 TRACE(("empty queue dequeing"))
63 void *examine(struct Queue* queue) {
65 assert(!isempty(queue));
66 return queue->head->item;
69 void enqueue(struct Queue* queue, void* item) {
73 TRACE(("enter enqueue"))
74 newlink = (struct Link*)m_malloc(sizeof(struct Link));
79 if (queue->tail != NULL) {
80 queue->tail->link = newlink;
82 queue->tail = newlink;
84 if (queue->head == NULL) {
85 queue->head = newlink;
88 TRACE(("leave enqueue"))