Re: How to get at the entire input buffer string from inside lexer?

Eric Fowler <eric.fowler@gmail.com> wrote:
(snip)


> The *XX field is a single byte checksum calculated from the rest of
> the string up to that point.


> I am looking for a nice clean way of checking the sum within either
> the parser or the lexer, that is, calculating the checksum from the
> whole string and comparing it to the value I got embedded in the
> string itself.


Many checksums are designed such that, when computed over
the whole string including the checksum character,
the result is a known constant, usually zero or ~0.


That avoids the need for a special check for the last
character and a compare operation, but it may or
may not help in your caes.


-- glen

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