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new file: double_linked_list.c

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remotes/private/master
nihonium 3 years ago
parent d72079fcfe
commit 4d0312f2eb
1 changed files with 198 additions and 0 deletions
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list_and_trees/double_linked_list.c
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#include <stdio.h>
#include <stdlib.h>
typedef int Data;
struct Node {
struct Node * next;
struct Node * prev;
Data data;
};
void list_init(struct Node * list);
void list_insert(struct Node * list, struct Node * t);
void list_insert_before(struct Node * list, struct Node * t);
void list_remove(struct Node * t);
struct Node * list_push_front(struct Node * list, Data d);
struct Node * list_push_back(struct Node * list, Data d);
Data list_pop_front(struct Node * list);
Data list_pop_back(struct Node * list);
Data list_delete(struct Node * t);
void list_print (struct Node * list);
Data list_sum (struct Node * list);
int list_is_empty(struct Node * list);
int list_clear(struct Node * list);
void list_for_each(struct Node * list, void (*func)(Data d, void * param), void * param);
void print_it(Data d, void * parameter);
void sum(Data a, void * s);
void list_init(struct Node * list) {
list->next = list;
list->prev = list;
list->data = 113;
}
/*void list_print (struct Node * list) {
if (list != list->next) {
list_for_each(list, print_it, stdout);
printf("\n");
}
else {
printf("Empty list\n");
}
}*/
void list_print (struct Node * list) {
struct Node *ptr = list->next;
if (ptr == list) {
printf("Empty list\n");
}
else {
while (ptr->next != list) {
printf("%d ", ptr->data);
//printf("%d [%p](prev is %p, next is %p)\n", ptr->data, ptr, ptr->prev, ptr->next);
ptr = ptr->next;
}
printf("%d\n", ptr->data);
//printf("%d [%p](prev is %p, next is %p)\n", ptr->data, ptr, ptr->prev, ptr->next);
}
}
void list_insert(struct Node * list, struct Node * t) {
t->next = list->next;
t->prev = list;
if (t->next != list) {
t->next->prev = t;
}
else {
t->next = list;
list->prev = t;
}
list->next = t;
}
void list_insert_before(struct Node * list, struct Node * t) {
t->next = list;
t->prev = list->prev;
if (t->prev != list) {
t->prev->next = t;
}
else {
t->prev = list;
list->next = t;
}
list->prev = t;
}
void list_remove(struct Node * t) {
t->prev->next = t->next;
t->next->prev = t->prev;
}
struct Node * list_push_front(struct Node * list, Data d) {
struct Node *ptr = list->next;
struct Node *oth = malloc(sizeof(struct Node));
oth->data = d;
oth->next = ptr;
oth->prev = list;
list->next = oth;
ptr->prev = oth;
return list;
}
struct Node * list_push_back(struct Node * list, Data d) {
struct Node *ptr = list->prev;
struct Node *oth = malloc(sizeof(struct Node));
oth->data = d;
oth->next = list;
oth->prev = ptr;
list->prev = oth;
ptr->next = oth;
return list;
}
int list_is_empty(struct Node * list) {
if (list == list->next) {
return 1;
}
return 0;
}
int list_clear(struct Node * list) {
struct Node *ptr = list->next;
struct Node *next;
while (ptr->next != list) {
next = ptr->next;
free(ptr);
ptr = next;
}
list->next = list;
list->prev = list;
return 0;
}
Data list_pop_front(struct Node * list) {
struct Node *ptr = list->next;
Data val = ptr->data;
list->next = ptr->next;
ptr->next->prev = list;
free(ptr);
return val;
}
Data list_pop_back(struct Node * list) {
struct Node *ptr = list->prev;
Data val = ptr->data;
list->prev = ptr->prev;
ptr->prev->next = list;
free(ptr);
return val;
}
Data list_delete(struct Node * t) {
t->prev->next = t->next;
t->next->prev = t->prev;
Data val = t->data;
free(t);
return val;
}
void list_for_each(struct Node * list, void (*func)(Data d, void * param), void * param) {
struct Node *ptr = list->next;
while (ptr->next != list) {
func(ptr->data, param);
ptr = ptr->next;
}
}
void sum(Data a, void * s) {
*(Data *)s += a;
}
void print_it(Data d, void * param) {
FILE * fd = param;
fprintf(fd, "%d ", d);
}
Data list_sum (struct Node * list) {
int s = 0;
list_for_each(list, sum, &s);
return s;
}
int main() {
struct Node x[10];
struct Node * a = malloc(sizeof(struct Node));
struct Node * b = malloc(sizeof(struct Node));
int i;
list_init(a);
list_init(b);
for(i=0; i<10; i++) {
x[i].data = i;
list_insert(a, &x[i]);
}
list_print(a);
}