summaryrefslogtreecommitdiff
path: root/lib/llist.c
blob: ae5a466c60fcc29dc9642701e0e9ba90ca4bdb9f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2005, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 * $Id$
 ***************************************************************************/

#include "setup.h"

#include <string.h>
#include <stdlib.h>

#include "llist.h"
#include "memory.h"

/* this must be the last include file */
#include "memdebug.h"

void
Curl_llist_init(struct curl_llist *l, curl_llist_dtor dtor)
{
  l->size = 0;
  l->dtor = dtor;
  l->head = NULL;
  l->tail = NULL;
}

struct curl_llist *
Curl_llist_alloc(curl_llist_dtor dtor)
{
  struct curl_llist *list;

  list = (struct curl_llist *)malloc(sizeof(struct curl_llist));
  if(NULL == list)
    return NULL;

  Curl_llist_init(list, dtor);

  return list;
}

/*
 * Curl_llist_insert_next() returns 1 on success and 0 on failure.
 */
int
Curl_llist_insert_next(struct curl_llist *list, struct curl_llist_element *e,
                       const void *p)
{
  struct curl_llist_element *ne =
    (struct curl_llist_element *) malloc(sizeof(struct curl_llist_element));
  if(!ne)
    return 0;

  ne->ptr = (void *) p;
  if (list->size == 0) {
    list->head = ne;
    list->head->prev = NULL;
    list->head->next = NULL;
    list->tail = ne;
  }
  else {
    ne->next = e->next;
    ne->prev = e;
    if (e->next) {
      e->next->prev = ne;
    }
    else {
      list->tail = ne;
    }
    e->next = ne;
  }

  ++list->size;

  return 1;
}

int
Curl_llist_remove(struct curl_llist *list, struct curl_llist_element *e,
                  void *user)
{
  if (e == NULL || list->size == 0)
    return 1;

  if (e == list->head) {
    list->head = e->next;

    if (list->head == NULL)
      list->tail = NULL;
    else
      e->next->prev = NULL;
  } else {
    e->prev->next = e->next;
    if (!e->next)
      list->tail = e->prev;
    else
      e->next->prev = e->prev;
  }

  list->dtor(user, e->ptr);
  free(e);
  --list->size;

  return 1;
}

void
Curl_llist_destroy(struct curl_llist *list, void *user)
{
  if(list) {
    while (list->size > 0)
      Curl_llist_remove(list, list->tail, user);

    free(list);
  }
}