list.c

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#include <stdlib.h>
#include <string.h>
#include "list.h"

list *make_list()
{
        list *l = malloc(sizeof(list));
        l->size = 0;
        l->front = 0;
        l->back = 0;
        return l;
}

/*
void transfer_node(list *s, list *d, node *n)
{
    node *prev, *next;
    prev = n->prev;
    next = n->next;
    if(prev) prev->next = next;
    if(next) next->prev = prev;
    --s->size;
    if(s->front == n) s->front = next;
    if(s->back == n) s->back = prev;
}
*/

void *list_pop(list *l){
    if(!l->back) return 0;
    node *b = l->back;
    void *val = b->val;
    l->back = b->prev;
    if(l->back) l->back->next = 0;
    free(b);
    --l->size;
    
    return val;
}

void list_insert(list *l, void *val)
{
        node *new = malloc(sizeof(node));
        new->val = val;
        new->next = 0;

        if(!l->back){
                l->front = new;
                new->prev = 0;
        }else{
                l->back->next = new;
                new->prev = l->back;
        }
        l->back = new;
        ++l->size;
}

void free_node(node *n)
{
        node *next;
        while(n) {
                next = n->next;
                free(n);
                n = next;
        }
}

void free_list(list *l)
{
        free_node(l->front);
        free(l);
}

void free_list_contents(list *l)
{
        node *n = l->front;
        while(n){
                free(n->val);
                n = n->next;
        }
}

void **list_to_array(list *l)
{
    void **a = calloc(l->size, sizeof(void*));
    int count = 0;
    node *n = l->front;
    while(n){
        a[count++] = n->val;
        n = n->next;
    }
    return a;
}