[Toybox] dd in toybox?

[scsijon]

I was wondering if you would consider adding parts of ddfldd 
(https://linuxx.info/dcfldd/, https://linux.die.net/man/1/dcfldd and 
http://dcfldd.sourceforge.net/) rather than having just the ordinary dd 
'bits' to your dd implementation if possible? I know it's not new, but 
the extra operands "pattern, textpattern and errlog" at least seem to be 
somewhat more than just clearly usefull, with maybe the pair "hash and 
hashwindow" also if possible. Or do you have some other way we can deal 
with these combined functions easily?

And as usual, i'll state that i'm not a coder nowadays, just a builder 
with a 3d perspective outlook, I can't give you a patch, just an idea 
for someone to work with. :-)}

regards and keep up the good fight.