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发表于 2022-3-22 03:26:19
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估计你要的是单向循环链表,但是因为我不认真看题,我写完了双向循环链表后才发现这个问题
不管怎么说,双向循环链表也是循环链表
参考下面的这个代码自己完成单向循环链表吧
list.h
- #ifndef _LIST_H_
- #define _LIST_H_
- #include <stddef.h>
- #include <stdbool.h>
- typedef struct list_node_tag {
- struct list_node_tag *prev;
- struct list_node_tag *next;
- void *data;
- size_t size;
- } list_node_t;
- typedef struct {
- list_node_t *node;
- size_t size;
- } list_t;
- list_t *list_init(void);
- void list_deinit(list_t *list);
- void list_clean(list_t *list);
- bool list_insert(list_t *list, size_t index, const void *data, size_t size);
- bool list_delete(list_t *list, size_t index);
- bool list_set(list_t *list, size_t index, const void *data, size_t size);
- bool list_get(const list_t *list, size_t index, void *data, size_t size);
- bool list_append(list_t *list, const void *data, size_t size);
- bool list_empty(const list_t *list);
- size_t list_size(const list_t *list);
- list_t *list_union(const list_t *a, const list_t *b);
- #endif
复制代码
list.c
- #include "list.h"
- #include <stdlib.h>
- #include <string.h>
- #define GET_NODE(list, index) ({ \
- const list_t *this_list = list; \
- size_t this_index = (index) + 1; \
- list_node_t *node = this_list->node; \
- while(this_index--) node = node->next; \
- node; \
- })
- static list_node_t *new_node(size_t size) {
- list_node_t *node = malloc(sizeof(*node));
- if(!node) return node;
- node->data = malloc(size);
- if(size && !node->data) {free(node); return NULL;}
- node->size = size;
- node->next = node;
- node->prev = node;
- return node;
- }
- static void delete_node(list_node_t *node) {
- if(!node) return;
- free(node->data);
- free(node);
- }
- list_t *list_init(void) {
- list_t *list = malloc(sizeof(*list));
- if(!list) return list;
- list->node = new_node(0);
- if(!list->node) {free(list); return NULL;}
- list->size = 0;
- return list;
- }
- void list_deinit(list_t *list) {
- if(!list) return;
- list_clean(list);
- delete_node(list->node);
- free(list);
- }
- void list_clean(list_t *list) {
- if(!list) return;
- while(!list_empty(list)) list_delete(list, 0);
- }
- bool list_insert(list_t *list, size_t index, const void *data, size_t size) {
- if(!list) return false;
- if(index > list_size(list)) return false;
- list_node_t *node = new_node(size);
- if(!node) return false;
- memcpy(node->data, data, node->size);
- list_node_t *current = list->node;
- while(index--) current = current->next;
- node->next = current->next;
- node->prev = current;
- current->next = node;
- node->next->prev = node;
- ++list->size;
- return true;
- }
- bool list_delete(list_t *list, size_t index) {
- if(!list) return false;
- if(index >= list_size(list)) return false;
- list_node_t *current = list->node;
- while(index--) current = current->next;
- list_node_t *temp = current->next;
- current->next = temp->next;
- temp->next->prev = current;
- delete_node(temp);
- --list->size;
- return true;
- }
- bool list_set(list_t *list, size_t index, const void *data, size_t size) {
- if(!list) return false;
- bool res = list_delete(list, index);
- if(!res) return res;
- return list_insert(list, index, data, size);
- }
- bool list_get(const list_t *list, size_t index, void *data, size_t size) {
- if(!list) return false;
- if(index >= list_size(list)) return false;
- list_node_t *current = GET_NODE(list, index);
- if(!data) return false;
- if(size < current->size) return false;
- memcpy(data, current->data, current->size);
- return true;
- }
- bool list_append(list_t *list, const void *data, size_t size) {
- if(!list) return false;
- return list_insert(list, list_size(list), data, size);
- }
- bool list_empty(const list_t *list) {
- if(!list) return true;
- return list->size == 0;
- }
- size_t list_size(const list_t *list) {
- if(!list) return 0;
- return list->size;
- }
- list_t *list_union(const list_t *a, const list_t *b) {
- list_t *list = list_init();
- for(size_t i = 0; i < list_size(a); ++i) {
- list_node_t *current = GET_NODE(a, i);
- list_append(list, current->data, current->size);
- }
- for(size_t i = 0; i < list_size(b); ++i) {
- list_node_t *current = GET_NODE(b, i);
- list_append(list, current->data, current->size);
- }
- return list;
- }
复制代码
main.c
- #include "list.h"
- #include <stdio.h>
- typedef struct {
- char c;
- int i;
- double d;
- } test_t;
- int main(void) {
- list_t *list = list_init();
- {
- test_t t = {'x', 123, 3.14};
- list_append(list, &t.c, sizeof(t.c));
- list_append(list, &t.i, sizeof(t.i));
- list_append(list, &t.d, sizeof(t.d));
- list_append(list, &t, sizeof(t));
- }
- {
- test_t t;
- list_get(list, 0, &t.c, sizeof(t.c));
- list_get(list, 1, &t.i, sizeof(t.i));
- list_get(list, 2, &t.d, sizeof(t.d));
- printf("%c %d %lf\n", t.c, t.i, t.d);
- }
- {
- test_t t;
- list_get(list, 3, &t, sizeof(t));
- printf("%c %d %lf\n", t.c, t.i, t.d);
- }
- {
- double d;
- list_delete(list, 1);
- list_get(list, 1, &d, sizeof(d));
- printf("%lf\n", d);
- }
- {
- char c;
- list_delete(list, 1);
- list_get(list, 0, &c, sizeof(c));
- printf("%c\n", c);
- }
- {
- list_delete(list, 1);
- list_delete(list, 0);
- for(size_t i = 0; i < 10; ++i) {
- list_append(list, &i, sizeof(i));
- }
- }
- {
- size_t i;
- list_get(list, 9, &i, sizeof(i));
- printf("%lu\n", i);
- }
- list_deinit(list);
- {
- list_t *a = list_init();
- list_t *b = list_init();
- for(size_t i = 0; i < 10; ++i) {
- list_append(a, &i, sizeof(i));
- }
- for(size_t i = 100; i < 107; ++i) {
- list_append(b, &i, sizeof(i));
- }
- list_t *c = list_union(a, b);
- for(size_t i = 0; i < list_size(c); ++i) {
- size_t value;
- list_get(c, i, &value, sizeof(value));
- printf("%lu ", value);
- }
- puts("");
- list_deinit(c);
- list_deinit(b);
- list_deinit(a);
- }
- return 0;
- }
复制代码
- $ gcc-debug -o main main.c list.c
- $ ./main
- x 123 3.140000
- x 123 3.140000
- 3.140000
- x
- 9
- 0 1 2 3 4 5 6 7 8 9 100 101 102 103 104 105 106
- $
复制代码
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