Re: Can we add an error state variable?

[Petr M. <mi...@ph...>]

> I am wondering if we can and should implement something of the sort
> automatically.  It's easy to have int_error() set an error flag.

I've tested the patch. I see in the docs:

The read-only variable GPVAL_ERRORNO is set to a non-zero value if any 
gnuplot command terminates early due to an error.  The most recent error 
message is stored in the string variable GPVAL_ERRORMSG.  Both GPVAL_ERRORNO 
and GPVAL_ERRORMSG can be cleared using the command `reset errors`.

I don't like the name "ERRORNO" very much -- the naming is contrary to what 
one would expect -- according to the docs it should be called 
GPVAL_ERRORYES. I would vote for just a simple name GPVAL_ERROR.
(Names like GPVAL_ERRORWAS don't look so nice.)

With this change, I propose the patch can go to cvs.

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PM