/*
* librdkafka - Apache Kafka C library
*
* Copyright (c) 2016 Magnus Edenhill
* All rights reserved.
*
* 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.
*
* 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 COPYRIGHT OWNER OR CONTRIBUTORS 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.
*/

/**
 * System portability
 */

#include "rd.h"


#include <stdlib.h>

/**
 * qsort_r substitute
 * This nicely explains why we wont bother with the native implementation
 * on Win32 (qsort_s), OSX/FreeBSD (qsort_r with diff args):
 * http://forum.theorex.tech/t/different-declarations-of-qsort-r-on-mac-and-linux/93/2
 */
static RD_TLS int (*rd_qsort_r_cmp) (const void *, const void *, void *);
static RD_TLS void *rd_qsort_r_arg;

static RD_UNUSED
int rd_qsort_r_trampoline (const void *a, const void *b) {
        return rd_qsort_r_cmp(a, b, rd_qsort_r_arg);
}

void rd_qsort_r (void *base, size_t nmemb, size_t size,
                 int (*compar)(const void *, const void *, void *),
                 void *arg) {
        rd_qsort_r_cmp = compar;
        rd_qsort_r_arg = arg;
        qsort(base, nmemb, size, rd_qsort_r_trampoline);
        rd_qsort_r_cmp = NULL;
        rd_qsort_r_arg = NULL;
}