/*
 * $Id: stdlib_constructor_begin.c,v 1.10 2005-03-25 08:50:59 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2005 by Olaf Barthel <olsen@sourcery.han.de>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Neither the name of Olaf Barthel nor the names of 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 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.
 */

#ifndef _STDLIB_HEADERS_H
#include "stdlib_headers.h"
#endif /* _STDLIB_HEADERS_H */

/****************************************************************************/

#include <stdlib.h>

/****************************************************************************/

#if defined(__SASC)

/****************************************************************************/

extern int	(* __far __ctors[])(void);
extern void	(* __far __dtors[])(void);

/****************************************************************************/

/* With SAS/C this function is placed in front of the first constructor
   table entry. It will invoke all following constructors and
   finally all the destructors. We don't use this approach here and
   we can't because the naming scheme we use for the constructor and
   destructor functions differs from the default SAS/C usage. With
   SAS/C the default behaviour is to invoke the constructors in
   ascending order of priority. We invoke them in descending order of
   priority (highest first). */
void
__construct(void)
{
}

/****************************************************************************/

void
_init(void)
{
	void * volatile p = &__ctors;

	/* The address is NULL if no constructor functions are to be used. */
	if(p != NULL)
	{
		int num_constructors;
		int i;

		/* Count the number of constructors we have to deal with. */
		num_constructors = 0;

		while(__ctors[num_constructors] != NULL)
			num_constructors++;

		for(i = 0 ; i < num_constructors ; i++)
		{
			if((*__ctors[num_constructors - (i + 1)])() != 0)
				exit(RETURN_FAIL);
		}
	}
}

/****************************************************************************/

void
_fini(void)
{
	void * volatile p = &__dtors;

	/* The address is NULL if no destructor functions are to be used. */
	if(p != NULL)
	{
		static int i;

		int num_destructors;

		/* Count the number of destructors we have to deal with. */
		num_destructors = 0;

		while(__dtors[num_destructors] != NULL)
			num_destructors++;

		while(i < num_destructors)
		{
			/* Increment this before jumping in, so that the next
			   invocation will always pick up the destructor following
			   the one we will invoke rigt now. */
			i++;

			(*__dtors[num_destructors - i])();
		}
	}
}

/****************************************************************************/

#endif /* __SASC */

/****************************************************************************/

#if defined(__GNUC__) && !defined(__amigaos4__)

/****************************************************************************/

/* The GCC 68k port does not sort constructor/destructor functions. We
   have to sort them here all on our own before they can be used. */

/****************************************************************************/

typedef void (*func_ptr)(void);

/****************************************************************************/

struct private_function
{
	func_ptr	function;
	int			priority;
};

/****************************************************************************/

extern func_ptr __INIT_LIST__[];
extern func_ptr __EXIT_LIST__[];

/****************************************************************************/

extern func_ptr __CTOR_LIST__[];
extern func_ptr __DTOR_LIST__[];

/****************************************************************************/

/* Sort the private function table in ascending order by priority. This is
   a simple bubblesort algorithm which assumes that there will be at least
   two entries in the table worth sorting. */
static void
sort_private_functions(struct private_function * base, size_t count)
{
	struct private_function * a;
	struct private_function * b;
	size_t i,j;

	i = count - 2;

	do
	{
		a = base;

		for(j = 0 ; j <= i ; j++)
		{
			b = a + 1;

			if(a->priority > b->priority)
			{
				struct private_function t;

				t		= (*a);
				(*a)	= (*b);
				(*b)	= t;
			}

			a = b;
		}
	}
	while(i-- > 0);
}

/****************************************************************************/

/* Sort all the init and exit functions (private library constructors), then
   invoke the init functions in descending order. */
static void
call_init_functions(void)
{
	LONG num_init_functions = (LONG)(__INIT_LIST__[0]) / 2;
	LONG num_exit_functions = (LONG)(__EXIT_LIST__[0]) / 2;

	ENTER();

	SHOWVALUE(num_init_functions);

	if(num_init_functions > 1)
		sort_private_functions((struct private_function *)&__INIT_LIST__[1],num_init_functions);

	SHOWVALUE(num_exit_functions);

	if(num_exit_functions > 1)
		sort_private_functions((struct private_function *)&__EXIT_LIST__[1],num_exit_functions);

	if(num_init_functions > 0)
	{
		struct private_function * t = (struct private_function *)&__INIT_LIST__[1];
		LONG i,j;

		for(j = 0 ; j < num_init_functions ; j++)
		{
			i = num_init_functions - (j + 1);

			D(("calling init function #%ld, 0x%08lx",i,t[i].function));

			(*t[i].function)();
		}
	}

	LEAVE();
}

/****************************************************************************/

/* Call all exit functions in ascending order; this assumes that the function
   table was prepared by call_init_functions() above. */
static void
call_exit_functions(void)
{
	LONG num_exit_functions = (LONG)(__EXIT_LIST__[0]) / 2;

	ENTER();

	if(num_exit_functions > 0)
	{
		STATIC LONG j = 0;

		struct private_function * t = (struct private_function *)&__EXIT_LIST__[1];
		LONG i;

		while(j++ < num_exit_functions)
		{
			i = j - 1;

			D(("calling exit function #%ld, 0x%08lx",i,t[i].function));

			(*t[i].function)();
		}
	}

	LEAVE();
}

/****************************************************************************/

static void
call_constructors(void)
{
	ULONG num_ctors = (ULONG)__CTOR_LIST__[0];
	ULONG i;

	ENTER();

	D(("there are %ld constructors to be called",num_ctors));

	/* Call all constructors in reverse order */
	for(i = 0 ; i < num_ctors ; i++)
	{
		D(("calling constructor #%ld, 0x%08lx",i,__CTOR_LIST__[1+i]));

		__CTOR_LIST__[num_ctors - i]();
	}

	LEAVE();
}

/****************************************************************************/

static void
call_destructors(void)
{
	ULONG num_dtors = (ULONG)__DTOR_LIST__[0];
	static ULONG i;

	ENTER();

	D(("there are %ld destructors to be called",num_dtors));

	/* Call all destructors in forward order */
	while(i++ < num_dtors)
	{
		D(("calling destructor #%ld, 0x%08lx",i,__DTOR_LIST__[i]));

		__DTOR_LIST__[i]();
	}

	SHOWMSG("all done.");

	LEAVE();
}

/****************************************************************************/

void
_init(void)
{
	ENTER();

	call_init_functions();
	call_constructors();

	LEAVE();
}

/****************************************************************************/

void
_fini(void)
{
	ENTER();

	call_destructors();
	call_exit_functions();

	LEAVE();
}

/****************************************************************************/

#endif /* __GNUC__ && !__amigaos4__ */
