Improved chunk allocation logic

Improved chunk allocation logic

Found memory deallocation edge case

Update and move chunk limit check

Generalize maximum size of input

Remove hard-coded values

Remove superfluous check before free

Let the kernel deal with extra data

Handle signals while reading

Conform to the manpage

Make CI happy

use `size_t` instead of `ssize_t`

`ssize_t` was used just so `--i` when `i` was zero would become -1
instead of SIZE_MAX. for looping through something in reverse order, the
"goes-to" operator (`-->`) can be used instead which doesn't require `i`
to be signed anymore.

remove useless blank line

use a normal loop

don't see any reason why freeing in reverse order would've been needed.

Co-authored-by: N-R-K <nrk@disroot.org>