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Re: Bug in history changes

Peter Stephenson wrote:
> Wayne Davison wrote:
> > On Wed, 20 Feb 2002, Peter Stephenson wrote:
> > > The latest version of the history code is causing zcalc to crash.
> > 
> > I'm ashamed to say that my last patch still left a stupid bug in
> > prepnexthistent().  I just committed the following fix to CVS.
> I'm still getting the crash after recompiling.

It seems to be the code with HISTEXPIREDUPSFIRST in
putoldhistentryontop() setting the next pointer to something that's
about to be free, but I don't remotely understand the code well enough
to be sure.  I made it go away by setting next to NULL if it was
pointing to something that was being freed, but I have no idea if this
is correct, or if that should ever happen.

Whether or not I do that, I now get:

+11:15% unsetopt histexpiredupsfirst
+11:15% HISTSIZE=1
+11:15% h
fc: no such event: 832

This doesn't happen if HISTSIZE is 2 or larger.

Peter Stephenson <pws@xxxxxxx>                  Software Engineer
CSR Ltd., Science Park, Milton Road,
Cambridge, CB4 0WH, UK                          Tel: +44 (0)1223 392070

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