add.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 <search.h>

#include "hash.h"
#include "class.h"

static
inline
int
hashAddComp(const void * a, const void * b)
{
    unsigned long hash_a = hashableGetHash((void*)a);
    unsigned long hash_b = hashableGetHash((void*)b);

    if (hash_a < hash_b) {
        return -1;
    }
    
    if (hash_a > hash_b) {
        return 1;
    }

    return 0;
}

void *
hashAdd(Hash this, void * operand)
{
    void * found = treeInsert(&this->root, operand, hashAddComp);

    if (NULL == found) {
        return NULL;
    }

    if (operand != found) {
        hashableHandleDouble(found, operand);
        delete(operand);
    }

    return found;
}

// vim: set ts=4 sw=4: