2of1

half a nibble of another

[From the ARM Architecture Reference Manual by David Seal]

A good way to branch to any location in the address space:

add lr, pc, #4
ldr pc, [pc, #-4]
dcd <function_address>

Here’s some code for a simple C hashtable.
Read the rest of this entry »

Here are the slides and code examples of the talk that I gave at the 7th DC9723 meet a few weeks ago.

To all those that came; thanks – I hope you found it interesting!

Just too cool: http://bellard.org/jslinux/

Here are two easy ways to compile 32-bit binaries on a 64-bit system.
Read the rest of this entry »

Peter van der Linden brought up a point regarding strcmp() his book Expert C Programming: Deep C Secrets that I found interesting.
Read the rest of this entry »

I’ve been looking around for an easy way to pull event information for a specific day from wikipedia in order to populate an internal database for one of my apps.

Turns out it’s dead simple.
Read the rest of this entry »

UPDATE: See comments

Linux purists are going to go crazy at this, but I was looking for a way to write to the kernel ring buffer (read by dmesg) from a userspace script.
I’m not going to debate the ‘whys’ – but in short I like having my sys logs for automated system actions (some which are userspace-launched) in one neat place.
Read the rest of this entry »

Some fantastic news to report!

Remember this issue?

Well, today I received an email from Mark Lawrence at Microsoft in regard to the issue of using the Windows SDK headers in FOSS.

Here’s an excerpt of the relevant bit:

"Creating a derivative of the d2d1.h header file would be a problem,
but merely looking at it for referential purposes in order to develop 
your own header and software for the Windows platform should be 
within the scope of the SDK license."

So it seems we have the go-ahead for ‘peeking’ in the original headers and using them as a base reference for our own!