GNUnet  0.11.x
gnunet-service-messenger_list_messages.c
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1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2020 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet is distributed in the hope that it will be useful, but
11  WITHOUT ANY WARRANTY; without even the implied warranty of
12  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
27 
28 void
30 {
31  GNUNET_assert(messages);
32 
33  messages->head = NULL;
34  messages->tail = NULL;
35 }
36 
37 void
39 {
40  GNUNET_assert(messages);
41 
42  while (messages->head)
43  {
44  struct GNUNET_MESSENGER_ListMessage *element = messages->head;
45 
46  GNUNET_CONTAINER_DLL_remove(messages->head, messages->tail, element);
47  GNUNET_free(element);
48  }
49 
50  messages->head = NULL;
51  messages->tail = NULL;
52 }
53 
54 void
56 {
58 
59  GNUNET_memcpy(&(element->hash), hash, sizeof(struct GNUNET_HashCode));
60 
61  GNUNET_CONTAINER_DLL_insert_tail(messages->head, messages->tail, element);
62 }
63 
64 void
66 {
67  struct GNUNET_MESSENGER_ListMessage *element;
68 
69  for (element = messages->head; element; element = element->next)
70  if (0 == GNUNET_CRYPTO_hash_cmp (&(element->hash), hash))
71  {
72  GNUNET_CONTAINER_DLL_remove(messages->head, messages->tail, element);
73  GNUNET_free(element);
74  break;
75  }
76 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
struct GNUNET_MESSENGER_ListMessage * next
struct GNUNET_MESSENGER_ListMessage * head
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_new(type)
Allocate a struct or union of the given type.
void init_list_messages(struct GNUNET_MESSENGER_ListMessages *messages)
Initializes list of message hashes as empty list.
void add_to_list_messages(struct GNUNET_MESSENGER_ListMessages *messages, const struct GNUNET_HashCode *hash)
Adds a specific hash from a message to the end of the list.
A 512-bit hashcode.
void remove_from_list_messages(struct GNUNET_MESSENGER_ListMessages *messages, const struct GNUNET_HashCode *hash)
Removes the first entry with a matching hash from the list.
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
struct GNUNET_MESSENGER_ListMessage * tail
void clear_list_messages(struct GNUNET_MESSENGER_ListMessages *messages)
Clears the list of message hashes.
int GNUNET_CRYPTO_hash_cmp(const struct GNUNET_HashCode *h1, const struct GNUNET_HashCode *h2)
Compare function for HashCodes, producing a total ordering of all hashcodes.
Definition: crypto_hash.c:311
#define GNUNET_free(ptr)
Wrapper around free.