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/*
* Dropbear - a SSH2 server
*
* Copyright (c) 2002,2003 Matt Johnston
* All rights reserved.
*
* 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 "includes.h"
#include "dbutil.h"
#include "queue.h"
void initqueue(struct Queue* queue) {
queue->head = NULL;
queue->tail = NULL;
queue->count = 0;
}
int isempty(struct Queue* queue) {
return (queue->head == NULL);
}
void* dequeue(struct Queue* queue) {
void* ret;
struct Link* oldhead;
assert(!isempty(queue));
ret = queue->head->item;
oldhead = queue->head;
if (oldhead->link != NULL) {
queue->head = oldhead->link;
} else {
queue->head = NULL;
queue->tail = NULL;
TRACE(("empty queue dequeing"));
}
m_free(oldhead);
queue->count--;
return ret;
}
void *examine(struct Queue* queue) {
assert(!isempty(queue));
return queue->head->item;
}
void enqueue(struct Queue* queue, void* item) {
struct Link* newlink;
TRACE(("enter enqueue"));
newlink = (struct Link*)m_malloc(sizeof(struct Link));
newlink->item = item;
newlink->link = NULL;
if (queue->tail != NULL) {
queue->tail->link = newlink;
}
queue->tail = newlink;
if (queue->head == NULL) {
queue->head = newlink;
}
queue->count++;
TRACE(("leave enqueue"));
}
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