Mercurial > dropbear

annotate queue.c @ 1060:4c733310c21d nocircbuffer

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reword comment for clarity
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 23:26:42 +0800
parents 9a5438271556
children 06d52bcb8094
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "dbutil.h"
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27 #include "queue.h"
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28
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29 void initqueue(struct Queue* queue) {
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30
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31 queue->head = NULL;
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32 queue->tail = NULL;
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33 queue->count = 0;
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34 }
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35
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36 int isempty(struct Queue* queue) {
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38 return (queue->head == NULL);
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39 }
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40
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41 void* dequeue(struct Queue* queue) {
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42
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43 void* ret;
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44 struct Link* oldhead;
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45 dropbear_assert(!isempty(queue));
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47 ret = queue->head->item;
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48 oldhead = queue->head;
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49
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50 if (oldhead->link != NULL) {
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51 queue->head = oldhead->link;
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52 } else {
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53 queue->head = NULL;
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54 queue->tail = NULL;
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55 TRACE(("empty queue dequeing"))
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56 }
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57
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58 m_free(oldhead);
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59 queue->count--;
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60 return ret;
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61 }
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62
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63 void *examine(struct Queue* queue) {
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64
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65 dropbear_assert(!isempty(queue));
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66 return queue->head->item;
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67 }
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68
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69 void enqueue(struct Queue* queue, void* item) {
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70
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71 struct Link* newlink;
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72
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73 newlink = (struct Link*)m_malloc(sizeof(struct Link));
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75 newlink->item = item;
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76 newlink->link = NULL;
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77
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78 if (queue->tail != NULL) {
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79 queue->tail->link = newlink;
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80 }
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81 queue->tail = newlink;
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83 if (queue->head == NULL) {
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84 queue->head = newlink;
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85 }
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86 queue->count++;
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87 }