111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
#include <stdlib.h>
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#include "unicorn/platform.h"
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#include "list.h"
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// simple linked list implementation
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struct list *list_new(void)
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{
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return calloc(1, sizeof(struct list));
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}
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// removed linked list nodes but does not free their content
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void list_clear(struct list *list)
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{
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struct list_item *next, *cur = list->head;
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while (cur != NULL) {
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next = cur->next;
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free(cur);
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cur = next;
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}
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list->head = NULL;
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list->tail = NULL;
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}
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// insert a new item at the begin of the list.
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// returns generated linked list node, or NULL on failure
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void *list_insert(struct list *list, void *data)
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{
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struct list_item *item = malloc(sizeof(struct list_item));
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if (item == NULL) {
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return NULL;
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}
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item->data = data;
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item->next = list->head;
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if (list->tail == NULL) {
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list->tail = item;
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}
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list->head = item;
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return item;
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}
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// append a new item at the end of the list.
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// returns generated linked list node, or NULL on failure
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void *list_append(struct list *list, void *data)
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{
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struct list_item *item = malloc(sizeof(struct list_item));
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if (item == NULL) {
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return NULL;
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}
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item->next = NULL;
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item->data = data;
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if (list->head == NULL) {
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list->head = item;
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} else {
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list->tail->next = item;
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}
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list->tail = item;
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return item;
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}
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// returns true if entry was removed, false otherwise
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bool list_remove(struct list *list, void *data)
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{
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struct list_item *next, *cur, *prev = NULL;
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// is list empty?
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if (list->head == NULL) {
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return false;
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}
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cur = list->head;
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while (cur != NULL) {
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next = cur->next;
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if (cur->data == data) {
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if (cur == list->head) {
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list->head = next;
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} else {
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prev->next = next;
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}
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if (cur == list->tail) {
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list->tail = prev;
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}
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free(cur);
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return true;
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}
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prev = cur;
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cur = next;
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}
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return false;
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}
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// returns true if the data exists in the list
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bool list_exists(struct list *list, void *data)
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{
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struct list_item *next, *cur = NULL;
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// is list empty?
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if (list->head == NULL) {
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return false;
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}
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cur = list->head;
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while (cur != NULL) {
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next = cur->next;
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if (cur->data == data) {
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return true;
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}
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cur = next;
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}
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return false;
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} |