amiga-clib2/library/stdlib_lib_main.c

/*
 * $Id: stdlib_lib_main.c,v 1.2 2006-01-08 12:04:25 obarthel Exp $
 *
 * :ts=4
 *
 * Portable ISO 'C' (1994) runtime library for the Amiga computer
 * Copyright (c) 2002-2015 by Olaf Barthel <obarthel (at) gmx.net>
 * 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.
 */

#if defined(__THREAD_SAFE)

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

#ifndef EXEC_EXECBASE_H
#include <exec/execbase.h>
#endif /* EXEC_EXECBASE_H */

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

#include <setjmp.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <ctype.h>

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

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

#ifndef _STDIO_HEADERS_H
#include "stdio_headers.h"
#endif /* _STDIO_HEADERS_H */

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

STATIC BOOL lib_init_successful;

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

STATIC BOOL
open_libraries(struct Library * sys_base)
{
	BOOL success = FALSE;
	int os_version;

	SysBase = sys_base;

	#if defined(__amigaos4__)
	{
		/* Get exec interface */
		IExec = (struct ExecIFace *)((struct ExecBase *)SysBase)->MainInterface;
	}
	#endif /* __amigaos4__ */

	/* Check which minimum operating system version we actually require. */
	os_version = 37;
	if(__minimum_os_lib_version > 37)
		os_version = __minimum_os_lib_version;

	/* Open the minimum required libraries. */
	DOSBase = (struct Library *)OpenLibrary("dos.library",os_version);
	if(DOSBase == NULL)
		goto out;

	__UtilityBase = OpenLibrary("utility.library",os_version);
	if(__UtilityBase == NULL)
		goto out;

	#if defined(__amigaos4__)
	{
		/* Obtain the interfaces for these libraries. */
		IDOS = (struct DOSIFace *)GetInterface(DOSBase, "main", 1, 0);
		if(IDOS == NULL)
			goto out;

		__IUtility = (struct UtilityIFace *)GetInterface(__UtilityBase, "main", 1, 0);
		if(__IUtility == NULL)
			goto out;
	}
	#endif /* __amigaos4__ */

	success = TRUE;

 out:

	return(success);
}

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

STATIC VOID
close_libraries(VOID)
{
	#if defined(__amigaos4__)
	{
		if(__IUtility != NULL)
		{
			DropInterface((struct Interface *)__IUtility);
			__IUtility = NULL;
		}

		if(IDOS != NULL)
		{
			DropInterface((struct Interface *)IDOS);
			IDOS = NULL;
		}
	}
	#endif /* __amigaos4__ */

	if(__UtilityBase != NULL)
	{
		CloseLibrary(__UtilityBase);
		__UtilityBase = NULL;
	}

	if(DOSBase != NULL)
	{
		CloseLibrary(DOSBase);
		DOSBase = NULL;
	}
}

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

VOID
__lib_exit(VOID)
{
	ENTER();

	if(lib_init_successful)
	{
		/* Enable exit() again. */
		__exit_blocked = FALSE;

		/* If one of the destructors drops into exit(), either directly
		   or through a failed assert() call, processing will resume with
		   the next following destructor. */
		(void)setjmp(__exit_jmp_buf);

		/* Go through the destructor list */
		_fini();

		close_libraries();

		lib_init_successful = FALSE;
	}

	LEAVE();
}

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

BOOL
__lib_init(struct Library * sys_base)
{
	int result = FALSE;

	ENTER();

	/* Make sure that no requesters and such pop up if anything
	   goes wrong during initialization. */
	__lib_startup = TRUE;

	/* Open dos.library and utility.library. */
	if(CANNOT open_libraries(sys_base))
		goto out;

	/* This plants the return buffer for _exit(). */
	if(setjmp(__exit_jmp_buf) != 0)
	{
		SHOWMSG("invoking the destructors");

		/* If one of the destructors drops into exit(), either directly
		   or through a failed assert() call, processing will resume with
		   the next following destructor. */
		(void)setjmp(__exit_jmp_buf);

		/* Go through the destructor list */
		_fini();

		goto out;
	}

	SHOWMSG("now invoking the constructors");

	/* Go through the constructor list */
	_init();

	/* Disable exit() and its kin. */
	__exit_blocked = TRUE;

	/* Remember this so that __lib_exit() will know what to do. */
	lib_init_successful = TRUE;

	result = TRUE;

 out:

	if(NOT lib_init_successful)
		close_libraries();

	RETURN(result);
	return(result);
}

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

#endif /* __THREAD_SAFE */