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annotate list.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 d204868e7943
children d68d61e7056a
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551
c3f2ec71e3d4 New standard linked list to use, rather than adhoc SignKeyList or TCPFwdList
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1 #include "options.h"
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2 #include "dbutil.h"
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3 #include "list.h"
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4
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5 void list_append(m_list *list, void *item) {
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6 m_list_elem *elem;
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7
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8 elem = m_malloc(sizeof(*elem));
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9 elem->item = item;
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10 elem->list = list;
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11 elem->next = NULL;
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12 if (!list->first) {
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13 list->first = elem;
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14 elem->prev = NULL;
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15 } else {
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16 elem->prev = list->last;
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17 list->last->next = elem;
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18 }
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19 list->last = elem;
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20 }
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21
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22 m_list * list_new() {
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23 m_list *ret = m_malloc(sizeof(m_list));
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24 ret->first = ret->last = NULL;
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25 return ret;
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26 }
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27
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28 void * list_remove(m_list_elem *elem) {
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29 void *item = elem->item;
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30 m_list *list = elem->list;
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31 if (list->first == elem)
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32 {
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33 list->first = elem->next;
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34 }
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35 if (list->last == elem)
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36 {
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37 list->last = elem->prev;
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38 }
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39 if (elem->prev)
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40 {
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41 elem->prev->next = elem->next;
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42 }
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43 if (elem->next)
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44 {
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45 elem->next->prev = elem->prev;
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46 }
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47 m_free(elem);
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48 return item;
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49 }