interface.c

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/**
 * \file
 *
 * \author  Georg Hopp
 *
 * \copyright
 * Copyright © 2012  Georg Hopp
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <sys/types.h>
#include <stdlib.h>

#include "class/interface.h"
#include "commons.h"

static
inline
int
comp(const void * _a, const void * _b)
{
    const struct interface * a = **(const struct interface ***)_a;
    const struct interface * b = **(const struct interface ***)_b;
    return ((a)<(b))? -1 : ((a)>(b))? 1 : 0;
}

/**
 * this one is important in selector functions to get the correct interface
 * implementation of a class.
 */
iface_ptr
interfaceGet(iface_impl_ptr iface_impl, const iface_ptr _iface)
{
    const iface_ptr * iface = &_iface;
    iface_ptr *       found;

    if (! iface_impl->simpl) {
        qsort((void**)(iface_impl->impl), iface_impl->nimpl, sizeof(iface_ptr), comp);
        iface_impl->simpl=TRUE;
    }

    found = bsearch(
            &iface,
            iface_impl->impl,
            iface_impl->nimpl,
            sizeof(iface_ptr),
            comp);

    return found? *found : (iface_ptr)NULL;
}

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