Minimalistic line based hex editor
provides minimal error checking

Works for files up to at least the maximum value of off_t,
which is usually either a 32 bit signed integer (i.e. 2GB)
or 64 bit (i.e. 8EB).
This program primarly uses functionality provided by POSIX,
and therefore should work on POSIX-compatible systems.

-- FEATURES --

* POSIX only
* Compiles with c89
* Buffers small blocks rather than reading the whole file

Yes, the last item seems silly, but *A LOT* hex editors will read the whole file.
This is just stupid because this makes it very slow (or the editor just crashes)
when you need to poke a couple of bytes in a 40GB+ file.

-- HOW TO USE --

Addressing memory:
Memory can be addressed by providing the hexadecimal address.
Note that all these addresses are absolute!
Bytes that are not currently buffered are printed as `~~'.
Bytes that are beyond the file size are printed as `??'.

Inspecting memory:
You can inspect memory by providing the hexadecimal address.
For example, `deadface' will report 16 bytes at location 0xdeadface.

Modifying memory:
You can modify memory by specifying the bytes that need to be poked at the specified address.
For example, `fa ce' will poke 0xce at 0xfa.
Note: modifications are immediately written to the file!

Resizing file:
You can increase or decrease the file size by specifying the new size in hexadecimal suffixed with `s'.
For example, 100s will resize the file to 0x100 bytes.

Quit the editor:
You can close the editor by typing `q'.

-- LIMITATIONS --

Since the program is very simple by design, it lacks lots of features from most hex editors.
Some include:
* Pokes are immediately written to the file
* All numbers are interpreted as hexadecimal (base 16) numbers.
* No undo/redo history
* No insert/delete