adtools/clib2

/*
 * $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 */