asn_SET_OF.c

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/*-
 * Copyright (c) 2003, 2004 Lev Walkin <vlm@lionet.info>. All rights reserved.
 * Redistribution and modifications are permitted subject to BSD license.
 */
#include <asn_internal.h>
#include <asn_SET_OF.h>
#include <errno.h>

/*
 * Add another element into the set.
 */
int
asn_set_add(void *asn_set_of_x, void *ptr) {
    asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);

    if(as == 0 || ptr == 0) {
        errno = EINVAL;     /* Invalid arguments */
        return -1;
    }

    /*
     * Make sure there's enough space to insert an element.
     */
    if(as->count == as->size) {
        int _newsize = as->size ? (as->size << 1) : 4;
        void *_new_arr;
        _new_arr = REALLOC(as->array, _newsize * sizeof(as->array[0]));
        if(_new_arr) {
            as->array = (void **)_new_arr;
            as->size = _newsize;
        } else {
            /* ENOMEM */
            return -1;
        }
    }

    as->array[as->count++] = ptr;

    return 0;
}

void
asn_set_del(void *asn_set_of_x, int number, int _do_free) {
    asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);

    if(as) {
        void *ptr;
        if(number < 0 || number >= as->count)
            return;

        if(_do_free && as->free) {
            ptr = as->array[number];
        } else {
            ptr = 0;
        }

        as->array[number] = as->array[--as->count];

        /*
         * Invoke the third-party function only when the state
         * of the parent structure is consistent.
         */
        if(ptr) as->free(ptr);
    }
}

/*
 * Free the contents of the set, do not free the set itself.
 */
void
asn_set_empty(void *asn_set_of_x) {
    asn_anonymous_set_ *as = _A_SET_FROM_VOID(asn_set_of_x);

    if(as) {
        if(as->array) {
            if(as->free) {
                while(as->count--)
                    as->free(as->array[as->count]);
            }
            FREEMEM(as->array);
            as->array = 0;
        }
        as->count = 0;
        as->size = 0;
    }

}