1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 /* 39 * btstack_linked_list.h 40 */ 41 42 #ifndef BTSTACK_LINKED_LIST_H 43 #define BTSTACK_LINKED_LIST_H 44 45 #include "btstack_bool.h" 46 47 #if defined __cplusplus 48 extern "C" { 49 #endif 50 51 /* API_START */ 52 53 typedef struct btstack_linked_item { 54 struct btstack_linked_item *next; // <-- next element in list, or NULL 55 } btstack_linked_item_t; 56 57 typedef btstack_linked_item_t * btstack_linked_list_t; 58 59 typedef struct { 60 int advance_on_next; 61 btstack_linked_item_t * prev; // points to the item before the current one 62 btstack_linked_item_t * curr; // points to the current item (to detect item removal) 63 } btstack_linked_list_iterator_t; 64 65 66 /** 67 * @brief Test if list is empty. 68 * @param list 69 * @returns true if list is empty 70 */ 71 bool btstack_linked_list_empty(btstack_linked_list_t * list); 72 73 /** 74 * @brief Add item to list as first element. 75 * @param list 76 * @param item 77 * @returns true if item was added, false if item already in list 78 */ 79 bool btstack_linked_list_add(btstack_linked_list_t * list, btstack_linked_item_t *item); 80 81 /** 82 * @brief Add item to list as last element. 83 * @param list 84 * @param item 85 * @returns true if item was added, false if item already in list 86 */ 87 bool btstack_linked_list_add_tail(btstack_linked_list_t * list, btstack_linked_item_t *item); 88 89 /** 90 * @brief Pop (get + remove) first element. 91 * @param list 92 * @returns first element or NULL if list is empty 93 */ 94 btstack_linked_item_t * btstack_linked_list_pop(btstack_linked_list_t * list); 95 96 /** 97 * @brief Remove item from list 98 * @param list 99 * @param item 100 * @returns true if item was removed, false if it is no't in list 101 */ 102 bool btstack_linked_list_remove(btstack_linked_list_t * list, btstack_linked_item_t *item); 103 104 /** 105 * @brief Get first element. 106 * @param list 107 * @returns first element or NULL if list is empty 108 */ 109 btstack_linked_item_t * btstack_linked_list_get_first_item(btstack_linked_list_t * list); 110 111 /** 112 * @brief Get last element. 113 * @param list 114 * @returns first element or NULL if list is empty 115 */ 116 btstack_linked_item_t * btstack_linked_list_get_last_item(btstack_linked_list_t * list); 117 118 /** 119 * @brief Counts number of items in list 120 * @returns number of items in list 121 */ 122 int btstack_linked_list_count(btstack_linked_list_t * list); 123 124 125 126 /** 127 * @brief Initialize Linked List Iterator 128 * @note robust against removal of current element by btstack_linked_list_remove 129 * @param it iterator context 130 * @param list 131 */ 132 void btstack_linked_list_iterator_init(btstack_linked_list_iterator_t * it, btstack_linked_list_t * list); 133 134 /** 135 * @brief Has next element 136 * @param it iterator context 137 * @returns true if next element is available 138 */ 139 bool btstack_linked_list_iterator_has_next(btstack_linked_list_iterator_t * it); 140 141 /** 142 * @brief Get next list eleemnt 143 * @param it iterator context 144 * @returns list element 145 */ 146 btstack_linked_item_t * btstack_linked_list_iterator_next(btstack_linked_list_iterator_t * it); 147 148 /** 149 * @brief Remove current list element from list 150 * @param it iterator context 151 */ 152 void btstack_linked_list_iterator_remove(btstack_linked_list_iterator_t * it); 153 154 /* API_END */ 155 156 void test_linked_list(void); 157 158 159 #if defined __cplusplus 160 } 161 #endif 162 163 #endif // BTSTACK_LINKED_LIST_H 164