object.c

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#include <sys/types.h>
#include <stddef.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>

#include <object.h>

int object_init(struct object *object, struct object_ops *ops)
{
        object->refcnt = 0;

        memcpy(&object->ops, ops, sizeof(*ops));
        return 0;
}

int object_create(struct object *object, void *data)
{
        int ret;

        if (object->refcnt > 0) {
                return -EINVAL;
        }

        if (object->ops.create) {
                ret = object->ops.create(object, data);
        } else {
                ret = 0;
        }

        object->refcnt = 1;
        return ret;
}

int object_destroy(struct object *object)
{
        int ret;

        if (object->refcnt <= 0) {
                return -EINVAL;
        }

        object->refcnt--;

        if (object->refcnt) {
                return 0;
        }

        if (object->ops.destroy) {
                ret = object->ops.destroy(object);
        } else {
                ret = 0;
        }

        return ret;
}

int object_copy(struct object *dest, struct object *src)
{
        int ret;

        if (src->refcnt <= 0) {
                return -EINVAL;
        }

        memcpy(dest, src, sizeof(*src));

        if (src->ops.copy) {
                ret = src->ops.copy(dest, src);
        } else {
                ret = 0;
        }

        dest->refcnt = 1;
        return ret;
}

struct object *object_link(struct object *object)
{
        struct object *ret;

        if (object->refcnt <= 0) {
                return NULL;
        }

        if (object->ops.link) {
                ret = object->ops.link(object);
        } else {
                ret = object;
        }

        if (ret) {
                object->refcnt++;
        }

        return ret;
}

/* End of a file */