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/*
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 * Copyright (c) 2002-2006 The TenDRA Project <http://www.tendra.org/>.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright notice,
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 *    this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright notice,
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 *    this list of conditions and the following disclaimer in the documentation
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 *    and/or other materials provided with the distribution.
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 * 3. Neither the name of The TenDRA Project nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific, prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
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 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
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 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 *
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 * $Id$
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 */
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/*
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    		 Crown Copyright (c) 1997
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    This TenDRA(r) Computer Program is subject to Copyright
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    owned by the United Kingdom Secretary of State for Defence
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    acting through the Defence Evaluation and Research Agency
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    (DERA).  It is made available to Recipients with a
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    royalty-free licence for its use, reproduction, transfer
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    to other parties and amendment for any purpose not excluding
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    product development provided that any such use et cetera
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    shall be deemed to be acceptance of the following conditions:-
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        (1) Its Recipients shall ensure that this Notice is
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        reproduced upon any copies or amended versions of it;
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        (2) Any amended version of it shall be clearly marked to
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        show both the nature of and the organisation responsible
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        for the relevant amendment or amendments;
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        (3) Its onward transfer from a recipient to another
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        party shall be deemed to be that party's acceptance of
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        these conditions;
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        (4) DERA gives no warranty or assurance as to its
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        quality or suitability for any purpose and DERA accepts
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        no liability whatsoever in relation to any use to which
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        it may be put.
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*/
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/**** exception.c --- Exception handling.
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 *
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 ** Author: Steve Folkes <smf@hermes.mod.uk>
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 *
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 **** Commentary:
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 *
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 * This file implements the exception handling facility specified in the file
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 * "exception.h".  See that file for more details.
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 *
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 **** Change Log:
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 * $Log: exception.c,v $
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 * Revision 1.1.1.1  1998/01/17  15:57:18  release
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 * First version to be checked into rolling release.
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 *
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 * Revision 1.2  1994/12/12  11:45:32  smf
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 * Performing changes for 'CR94_178.sid+tld-update' - bringing in line with
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 * OSSG C Coding Standards.
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 *
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 * Revision 1.1.1.1  1994/07/25  16:06:10  smf
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 * Initial import of os-interface shared files.
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 *
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**/
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/****************************************************************************/
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#include <setjmp.h>
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#include "exception.h"
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extern void			E_exception_unhandled
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(ExceptionP, CStringP, unsigned);
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extern void			E_exception_corrupt_handler
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(CStringP, unsigned);
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/*--------------------------------------------------------------------------*/
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HandlerP			X__exception_handler_stack = NIL(HandlerP);
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ThrowDataT			X__exception_throw_data;
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/*--------------------------------------------------------------------------*/
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NoReturnT
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X__exception_throw(void)
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{
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    static BoolT failing = FALSE;
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    HandlerP     stack   = X__exception_handler_stack;
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    if (failing) {
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	abort();
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	UNREACHED;
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    } else if (stack == NIL(HandlerP)) {
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	failing = TRUE;
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	E_exception_unhandled(X__exception_throw_data.exception,
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			       X__exception_throw_data.file,
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			       X__exception_throw_data.line);
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	abort();
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	UNREACHED;
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    }
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#ifdef PO_EXCEPTION_STACK_DIRECTION
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    if ((stack->magic_start != X__EXCEPTION_MAGIC) ||
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	(stack->magic_end != X__EXCEPTION_MAGIC) ||
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#if PO_EXCEPTION_STACK_DIRECTION > 0
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	(((GenericP)stack) > ((GenericP) &stack)) ||
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#endif /* PO_EXCEPTION_STACK_DIRECTION > 0 */
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#if PO_EXCEPTION_STACK_DIRECTION < 0
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	(((GenericP)stack) < ((GenericP) &stack)) ||
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#endif /* PO_EXCEPTION_STACK_DIRECTION < 0 */
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	(stack->next == stack)) {
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	failing = TRUE;
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	E_exception_corrupt_handler(stack->file, stack->line);
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	abort();
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	UNREACHED;
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    }
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#endif /* defined (PO_EXCEPTION_STACK_DIRECTION) */
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    longjmp(X__exception_handler_stack->buffer, 1);
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    UNREACHED;
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}
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CStringP
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exception_name(ExceptionP exc)
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{
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    return(exc);
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}