Re: [9fans] plan9port libdraw

[Russ Cox <russcox@gmail.com>]

> Looking at files like keyboard.c vs x11-keyboard.c a lot of
> functions are pretty close to the same except inner I/O
> handling functions.  Part of my problem is not really knowing
> the X11 APIs very well and as a result trying to understand
> what some of the code is doing is getting tricky.

Note that keyboard.c and mouse.c aren't actually
compiled.  They're just reference copies of the Plan 9
versions.

> I was a decent SDL programmer a few years back but I never
> really did much with X11. :)
> 
> Hopefully this will be more educational than frustrating.

If what you say about SDL being somewhat model-independent
is true, then it shouldn't be too bad.  The only files you'll need
to provide are equivalents to the x11-*.c in libdraw.
Some you can stub out (like x11-cload.c, where you
can just remove the if and its body), some will translate
fairly directly (like x11-mouse.c and x11-keyboard.c),
and others should have the non-X-dependent pieces split
out of them (like x11-init.c).  In all, though, it's only 2,500
lines of code, so it shouldn't be too bad.  And you definitely
don't need to understand X.  

If you have questions, feel free to ask.

Russ