source: libabac/abac_list.c @ d0efdec

#include <stdlib.h>

#include "abac_util.h"
#include "abac_list.h"

/****************************************************************/
abac_list_t *abac_list_new(void) {
    abac_list_t *ret = abac_xmalloc(sizeof(abac_list_t));
    ret->elts = NULL;
    ret->size = 0;
    return ret;
}

void abac_list_add(abac_list_t *list, void *elt) {
    abac_list_element_t *new_element = abac_xmalloc(sizeof(abac_list_element_t));

    new_element->ptr = elt;
    DL_APPEND(list->elts, new_element);
    ++list->size;
}

/* add only if it is not in the list already */
int abac_list_unique_add(abac_list_t *list, void *elt) {
    void *cur;
    abac_list_foreach(list, cur,
        if(cur == elt) 
            return 0;
    );

    abac_list_element_t *new_element = abac_xmalloc(sizeof(abac_list_element_t));
    new_element->ptr = elt;
    DL_APPEND(list->elts, new_element);
    ++list->size;
    return 1;
}

void abac_list_prepend(abac_list_t *list, void *elt) {
    abac_list_element_t *new_element = abac_xmalloc(sizeof(abac_list_element_t));

    new_element->ptr = elt;
    DL_PREPEND(list->elts, new_element);
    ++list->size;
}

int abac_list_remove(abac_list_t *list, void *elt) {
    abac_list_element_t *cur;

    // iterate the list, remove the item if we find it
    DL_FOREACH(list->elts, cur) {
        if (cur->ptr == elt) {
            DL_DELETE(list->elts, cur);
            free(cur);
            --list->size;
            return 1;
        }
    }

    // return false if we don't
    return 0;
}

int abac_list_size(abac_list_t *list) {
    if (list)
        return list->size;
    return 0;
}

void abac_list_free(abac_list_t *list) {
    abac_list_element_t *elt, *tmp;

    if (list) {
        // free everthing in the list
        DL_FOREACH_SAFE(list->elts, elt, tmp) {
            DL_DELETE(list->elts, elt);
            free(elt);
        }

        // free the list
        free(list);
    }
}