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From: cs325ec@ux1.cso.uiuc.edu
Newsgroups: comp.sys.atari.st
Subject: C help - Critical replacement
Message-ID: <16000023@ux1.cso.uiuc.edu>
Date: 12 Mar 90 10:39:37 GMT
Lines: 48
Nf-ID: #N:ux1.cso.uiuc.edu:16000023:000:782
Nf-From: ux1.cso.uiuc.edu!cs325ec    Mar 11 23:02:00 1990



	I am trying to set a function name to an absolute value in
	Turbo C:

	Could someone just drop a note on how to call olderrh (the
	old critical error handler) if I do not want to service the
	call?

	Thanks in advance

			-- Greg


	I have tried this and more:

#include <stdio.h>
#include <tos.h>

#define drivebits 0x0030

void *olderrh;

/****************************
	Critical Error Handler
****************************/
long criterr(int err, int drive)
	{
	if (drive & drivebits)
		return(1L);
	else
		return(eval(olderrh));
	}

/****************************
	Replace Error Handler
****************************/
void replerr(void)
	{
	olderrh = (void *)(*(long *)0x404L);
	*(long *)0x404L = (long)criterr;
	}

void main(void)
	{
	Supexec(replerr);
	Ptermres(0x400L,0);
	}