Newbie Q - Grammer rules for parsing HEX string in BISON

Hi,
I am new to BISON and am trying to setup the grammer rules for parsing
a hex string in BISON.

I am using the mfcalc example at
http://dinosaur.compilertools.net/bison/bison_5.html and trying to
parse a file containing strings such as,

DEFINE	Key1	0x01C8

and

SET Key1  0xAC,0xE5,0x31,0x2A,0x4C,0x1D,0x56,0xEA,
0x33,0xE9,0x2E,0x14,0xA2,0x
FA,0x4A,0x18

Can anyone help with the grammar?

thanks
SM

spacemonkeyxyz-google@yahoo.co.uk (Space Monkey) wrote
> I am new to BISON and am trying to setup the grammer rules for parsing
> a hex string in BISON.
>
> I am using the mfcalc example at
> http://dinosaur.compilertools.net/bison/bison_5.html and trying to
> parse a file containing strings such as,
>
> DEFINE	Key1	0x01C8
>
> and
>
> SET Key1  0xAC,0xE5,0x31,0x2A,0x4C,0x1D,0x56,0xEA,
0x33,0xE9,0x2E,0x14,0xA2,
0xFA,0x4A,0x18
>
> Can anyone help with the grammar?
>
> thanks

I should have added that the desired outcome is to populate the
contents of a binary file using instructions contained in a separate
text file.

For example, if I have a file test.bin, using the data in the above
email, I want to populate the file at location 0x01C8 (address Key1)
with the data 0xAC,0xE5 ..., according to the SET Key1 instruction.

I am a complete novice on YACC and BISON and any help with the grammar
rules for the parsing the hexadecimal list in the above example is
appreciated.