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Re: How to make "division by zero attempted" error message more informat
From: |
Andrew J. Schorr |
Subject: |
Re: How to make "division by zero attempted" error message more informative? |
Date: |
Thu, 3 Mar 2022 17:03:15 -0500 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Mar 03, 2022 at 01:55:23PM -0600, Neil R. Ormos wrote:
> There is no magic way for Gawk to know what should be printed in the error
> message to distinguish a particular call.
Well, the truth is that it wouldn't be hard to add such a feature. When gawk
starts up,
it parses the name by which it was invoked to extract the name to use at the
start
of error messages:
const char *myname;
...
int
main(int argc, char **argv)
{
...
myname = gawk_name(argv[0]);
So it would be fairly simple to add an environment variable to override this.
For example, one might test for an environment variable "GAWK_ERROR_NAME"
and use that instead if present and not empty:
if (!(myname = getenv("GAWK_ERROR_NAME")) || !*myname)
myname = gawk_name(argv[0]);
Now whether to patch the code in that fashion is a good idea is an entirely
different question. But anybody who needs that feature can easily
apply this patch. Or one could add a command-line option to accomplish
the same thing.
bash-4.2$ GAWK_ERROR_NAME=fubar ./gawk 'BEGIN {print 10/0}'
fubar: cmd. line:1: error: division by zero attempted
bash-4.2$
Regards,
Andy
err_name.patch
Description: Text document
Re: How to make "division by zero attempted" error message more informative?, Neil R. Ormos, 2022/03/03