/* Menes - C++ High-Level Utility Library
 * Copyright (C) 2004  Jay Freeman (saurik)
*/

/*
 *        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. The name of the author may not be used to endorse
 *    or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
*/

#include <cstdlib>

namespace {
struct ExitRecord_ {
    ExitRecord_ *next_;

    void (*func_)(void *);
    void *arg_;
    void *dso_;
} *atexits_; }

extern "C"
void *__dso_handle;

extern "C"
int __cxa_atexit(void (*func)(void *), void *arg, void *dso) {
    ExitRecord_ *record(reinterpret_cast<ExitRecord_ *>(::malloc(sizeof(ExitRecord_))));
    record->next_ = atexits_;
    record->func_ = func;
    record->arg_ = arg;
    record->dso_ = dso;

    atexits_ = record;
    return 0;
}

extern "C"
void __cxa_finalize(void *dso) {
    ExitRecord_ **record(&atexits_);
    while ((*record) != NULL)
        if (dso != NULL && (*record)->dso_ != dso)
            record = &(*record)->next_;
        else {
            (*record)->func_((*record)->arg_);
            ExitRecord_ *previous(*record);
            *record = (*record)->next_;
            ::free(previous);
        }
}

namespace {
struct AtExit_ {
    AtExit_() {
        atexit(&AtExit_::Exit);
    }

    static void Exit() {
        __cxa_finalize(__dso_handle);
    }
} atexit_; };