🚀 go-pugleaf

	I have been working on an interactive language (YAIL ?) and using
MSC 5.0, 6.0 as well as the Intel Code builder for C compilers. I want the
language to properly handle divide-by-zero traps. I have used _dos_getvect
and _dos_setvect to catch the traps and dispatch to routines, but I can't
seem to arrange to clear the error. I know I could have the catch routine
longjmp to a safe place, but I would rather have it set an error flag and
clear the condition. The observed behavior is that it loops because the
condition is never cleared and the divide is always restarted. I have tried
setting the divisor to a non-zero number in the catch routine, but I must be
doing something wrong. I thought that I could just set the AX register to
one, but perhaps it is being saved prior to entering the catch routine.
	Other suggestions ? Please email. It would be nice to have a
solution that could work both under MSC and the Intel compiler. Even better
if it was all in C, without assembly code. Thanks.


				Cheers,
				Dan Ts'o		212-327-7671
				Dept. Neurobiology	dan@rna.rockefeller.edu
				Rockefeller Univ.	...s5!rna!dan
				1230 York Ave.		tso@rockvax.bitnet
				NY, NY 10021