/**
 * @file bsort.h
 * @author Ambroz Bizjak <ambrop7@gmail.com>
 * 
 * @section LICENSE
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the author nor the
 *    names of its contributors may be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * @section DESCRIPTION
 * 
 * Sorting functions.
 */

#ifndef BADVPN_MISC_BSORT_H
#define BADVPN_MISC_BSORT_H

#include <stddef.h>
#include <stdint.h>
#include <string.h>

#include <misc/debug.h>
#include <misc/balloc.h>

typedef int (*BSort_comparator) (const void *e1, const void *e2);

static void BInsertionSort (void *arr, size_t count, size_t esize, BSort_comparator compatator, void *temp);

void BInsertionSort (void *arr, size_t count, size_t esize, BSort_comparator compatator, void *temp)
{
    ASSERT(esize > 0)
    
    for (size_t i = 0; i < count; i++) {
        size_t j = i;
        while (j > 0) {
            uint8_t *x = (uint8_t *)arr + (j - 1) * esize;
            uint8_t *y = (uint8_t *)arr + j * esize;
            int c = compatator(x, y);
            if (c <= 0) {
                break;
            }
            memcpy(temp, x, esize);
            memcpy(x, y, esize);
            memcpy(y, temp, esize);
            j--;
        }
    }
}

#endif