Re: Parsing '\x00' -- appears to be the only thing preventing parsing binary data

Thanks John, but the whole point is to try to leverage the internal tables and mechanisms that exist in Bison …. In particular the yytranslate[] table…. And to be able to write rules that use *all* the hex codes which flex -8 is supposed to pass along e.g.

R : ‘\x9f’ ‘\xfe’ | ‘\xff’ | ‘\x00’ ;

As well as succinctly express notions such as “any byte” — without listing every possible 8-bit value and having to check against them to accept a byte.


> On Apr 1, 2021, at 11:05, John P. Hartmann <[email protected]> wrote:
> 
> Write your own scanner in C.
> 
> On 4/1/21 16:28, Stephen Taylor via Users list for the GNU Bison parser generator wrote:
>> Thanks, that seems to get around \x00 -- unfortunately, the same issue then reappears with the values \x80 - \xff … I could special case every single value e.g.
>> \x00 {return ZERO; }
>> \x80 { return X80; }
>> \x81 { return X81; }
>>  :
>> \xff { return XFF; }
>> . | \n  { return *yytext; }
>> But seems a bit clumsy. Any thoughts?