Error message with bison and flex

Sometime the text return from a syntax error is very short.


I would like to output 5 lines before the error and
5 lines after the error.


Is this possible without affecting the error message.


If I used input to read the next 5 lins, the message won't be the same and
I don't want to always accumulate the 5 lines before, it will add a lot of overhead to the lexical analyser.


Tx
[The way I'd do it would be to write my own YY_INPUT() that slurps in
the whole file to a buffer when it starts and hands the input to the
lexer a line at a time, so it knows what line it's on. If there's an
error, it can then scan forward and backward in the file buffer to find
the five lines each way. -John]

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