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74971473 JG |
1 | /* |
2 | * This file is part of the PCEPlib, a PCEP protocol library. | |
3 | * | |
4 | * Copyright (C) 2020 Volta Networks https://voltanet.io/ | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public License | |
17 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
18 | * | |
19 | * Author : Brady Johnson <brady@voltanet.io> | |
20 | * | |
21 | */ | |
22 | ||
23 | ||
24 | #include <stdbool.h> | |
25 | #include <stdio.h> | |
26 | #include <string.h> | |
27 | ||
28 | #include "pcep_utils_logging.h" | |
29 | #include "pcep_utils_memory.h" | |
30 | #include "pcep_utils_queue.h" | |
31 | ||
32 | queue_handle *queue_initialize() | |
33 | { | |
34 | /* Set the max_entries to 0 to disable it */ | |
35 | return queue_initialize_with_size(0); | |
36 | } | |
37 | ||
38 | ||
39 | queue_handle *queue_initialize_with_size(unsigned int max_entries) | |
40 | { | |
41 | queue_handle *handle = | |
42 | pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_handle)); | |
43 | memset(handle, 0, sizeof(queue_handle)); | |
44 | handle->max_entries = max_entries; | |
45 | ||
46 | return handle; | |
47 | } | |
48 | ||
49 | ||
50 | void queue_destroy(queue_handle *handle) | |
51 | { | |
52 | if (handle == NULL) { | |
53 | pcep_log( | |
54 | LOG_DEBUG, | |
55 | "%s: queue_destroy, the queue has not been initialized", | |
56 | __func__); | |
57 | return; | |
58 | } | |
59 | ||
60 | while (queue_dequeue(handle) != NULL) { | |
61 | } | |
62 | pceplib_free(PCEPLIB_INFRA, handle); | |
63 | } | |
64 | ||
65 | ||
66 | void queue_destroy_with_data(queue_handle *handle) | |
67 | { | |
68 | if (handle == NULL) { | |
69 | pcep_log( | |
70 | LOG_DEBUG, | |
71 | "%s: queue_destroy_with_data, the queue has not been initialized", | |
72 | __func__); | |
73 | return; | |
74 | } | |
75 | ||
76 | void *data = queue_dequeue(handle); | |
77 | while (data != NULL) { | |
78 | pceplib_free(PCEPLIB_INFRA, data); | |
79 | data = queue_dequeue(handle); | |
80 | } | |
81 | pceplib_free(PCEPLIB_INFRA, handle); | |
82 | } | |
83 | ||
84 | ||
85 | queue_node *queue_enqueue(queue_handle *handle, void *data) | |
86 | { | |
87 | if (handle == NULL) { | |
88 | pcep_log( | |
89 | LOG_DEBUG, | |
90 | "%s: queue_enqueue, the queue has not been initialized", | |
91 | __func__); | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | if (handle->max_entries > 0 | |
96 | && handle->num_entries >= handle->max_entries) { | |
97 | pcep_log( | |
98 | LOG_DEBUG, | |
99 | "%s: queue_enqueue, cannot enqueue: max entries hit [%u]", | |
100 | handle->num_entries); | |
101 | return NULL; | |
102 | } | |
103 | ||
104 | queue_node *new_node = | |
105 | pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_node)); | |
106 | memset(new_node, 0, sizeof(queue_node)); | |
107 | new_node->data = data; | |
108 | new_node->next_node = NULL; | |
109 | ||
110 | (handle->num_entries)++; | |
111 | if (handle->head == NULL) { | |
112 | /* its the first entry in the queue */ | |
113 | handle->head = handle->tail = new_node; | |
114 | } else { | |
115 | handle->tail->next_node = new_node; | |
116 | handle->tail = new_node; | |
117 | } | |
118 | ||
119 | return new_node; | |
120 | } | |
121 | ||
122 | ||
123 | void *queue_dequeue(queue_handle *handle) | |
124 | { | |
125 | if (handle == NULL) { | |
126 | pcep_log( | |
127 | LOG_DEBUG, | |
128 | "%s: queue_dequeue, the queue has not been initialized", | |
129 | __func__); | |
130 | return NULL; | |
131 | } | |
132 | ||
133 | if (handle->head == NULL) { | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | void *node_data = handle->head->data; | |
138 | queue_node *node = handle->head; | |
139 | (handle->num_entries)--; | |
140 | if (handle->head == handle->tail) { | |
141 | /* its the last entry in the queue */ | |
142 | handle->head = handle->tail = NULL; | |
143 | } else { | |
144 | handle->head = node->next_node; | |
145 | } | |
146 | ||
147 | pceplib_free(PCEPLIB_INFRA, node); | |
148 | ||
149 | return node_data; | |
150 | } |