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/*************************************************************************/
/* Package name : Except. */
/* Version : 1.0 */
/* Completed : April 1993. */
/* Released : 29 September 1993. */
/* First created : This package was first created in April 1993. */
/* Summary : This package provides Ada-like exceptions for C. */
/* Components : except.fw - FunnelWeb source file. */
/* except.h - Exported header file. */
/* except.c - Implementation file. */
/* ex_test.c - C test program. */
/* Requires : style.h, as.h, as.c. */
/* Author : Ross N. Williams (ross@guest.adelaide.edu.au) */
/* Rocksoft^tm Pty Ltd */
/* 16 Lerwick Avenue, Hazelwood Park 5066, Australia. */
/* FTP Archive : This file can be found in */
/* "ftp.adelaide.edu.au/pub/funnelweb/examples/" */
/* Disclaimer : This program is distributed WITHOUT ANY WARRANTY; */
/* without even the implied warranty of MERCHANTABILITY */
/* or FITNESS FOR A PARTICULAR PURPOSE. */
/* Copyright : Copyright (C) Ross Williams 1993. */
/* However, permission is granted for anyone to copy, */
/* modify, and distribute this work for any purpose, */
/* commercial or non-commercial, so long as this notice */
/* is included verbatim, and so long as all */
/* modifications are recorded in the change log below. */
/* Changes : Please log any changes to this software either in the */
/* originating FunnelWeb source file, or, if you must, */
/* in the C source files produced from the FunnelWeb */
/* file. */
/* --<Start of Change Log>-- */
/* ??-Apr-93: RNW: Created this package. */
/* 29-Sep-93: RNW: Released this package. */
/* --<End of Change Log>-- */
/*************************************************************************/
#include "except.h"
#include "as.h"
#if !_EX_THRD
GLOVAR _ex_cx_t *_ex_curr = NULL;
GLOVAR p_ex_t _ex_id;
GLOVAR ptrint _ex_info;
#endif
EXPORT string ex_str (p_ex) p_ex_t p_ex; {return p_ex;}
LOCAL void ex_bomb P_((void));
LOCAL void ex_bomb ()
{
char s[100];
as_wr(" Exception desc is : \""); as_wr(EX_ID); as_wl("\".");
as_wr(" Exception id is : ");
sprintf(s,"%lu (= %lX)",ULONG(EX_ID),ULONG(EX_ID)); as_wl(s);
as_wr(" Exception info is : ");
sprintf(s,"%lu (= %lX)",ULONG(EX_INFO),ULONG(EX_INFO)); as_wl(s);
as_bomb("Aborting program after exception error.");
}
EXPORT void _exrai (p_ex)
p_ex_t p_ex;
{
#if _EX_FAST
as_bomb("_exrai: This function should not be called with _EX_FAST==TRUE.");
#else
_ex_cx_t * p_curr = _EX_CURR;
_EX_ID = p_ex;
if (p_curr == NULL) {as_wl("_exrai: Unhandled exception."); ex_bomb();}
if (UWIDE(&p_curr) > UWIDE(&p_curr->_ex_jmbf))
{
as_wl("_exrai: Target exception context is no longer legitimate.");
as_wl(" Exception context resides beneath the top of stack.");
as_wl(" This means that earlier on, control must have left an");
as_wl(" exception context without first popping its handler.");
as_wl(" Look for jumps out of exception contexts that are not");
as_wl(" immediately preceded by calls to EX_POP.");
ex_bomb();
}
if ((p_curr->_ex_mag1 != _EX_MAG1) || (p_curr->_ex_mag2 != _EX_MAG2))
{
as_wl("_exrai: Target exception context has been corrupted. This could");
as_wl(" be because an exception context wasn't popped, or it");
as_wl(" could be just a common garden-variety C corruption :-)");
ex_bomb();
}
longjmp(p_curr->_ex_jmbf,NON_ZERO);
#endif
}
EXPORT void _expop (p_check)
_ex_cx_t *p_check;
{
#if _EX_FAST
as_bomb("_exrai: This function should not be called with _EX_FAST==TRUE.");
#else
_ex_cx_t * p_curr = _EX_CURR;
if (p_curr != p_check)
{
if (p_curr == NULL)
as_bomb("_expop: Context stack is empty.");
else
as_bomb("_expop: Top of context stack is not the current context.");
}
if ((p_curr->_ex_mag1 != _EX_MAG1) || (p_curr->_ex_mag2 != _EX_MAG2))
{
as_wl("_ex_rai: Target exception context has been corrupted. This could");
as_wl(" be because an exception context wasn't popped, or it");
as_wl(" could be just a common garden-variety C corruption :-)");
as_bomb("Aborting program after exception error.");
}
p_curr->_ex_mag1 = ~_EX_MAG1;
p_curr->_ex_mag2 = ~_EX_MAG2;
_EX_CURR = p_curr->_ex_prev;
#endif
}
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