Posted by hank,
Fri Apr 25 23:40:00 UTC 2008
\ | /
/```\ \/ \/
_ | | _ /\
_ | | _ //\\
\___/ //\\
/ | \ ||
||
/||\
+++++++ +++[>+++++++>+++ +++++
+>+++>+\> +++++++++++>++++++++ ++++<<<
<<<-]>+++.>> @__ ++.<<+++.>>>>+.>--.<----- -----.<<.
<-.>>>>------- / \ .++++++.<<<.<<-.>>>>.>--------- .+++++++.<
.>++++++.<<.<<--.>>>++++.+++..<<.<++.>>>+++.>----.<<<.<<++.>>>>--------
------.>---..+++++++.<<<.<<.>>>>++++.<<<<--------------.?>>>.__________
Hint: It’s code, and the language it’s in has a dirty word in the name
Tags: programming
Posted by hank,
Sat Nov 24 19:46:00 UTC 2007
So, I have all these JPEGs, and I want to know which ones are corrupt (specifically, ones that end prematurely). qiv will spit out the following to STDERR when it finds one:
Premature end of JPEG file
So, this is nice, except it’s entirely unscriptable. The solution I found was using the following script to the display the images in sequence:
perl -e 'for(glob("*.png *.jpg")){$output = `qiv "$_" 2>&1;`; if($output =~ /Premature/){print $_, "\n";}}'
All this does is mix STDERR with STDOUT for a qiv of the file, and check the output for the word “Premature”. If it finds the word, it prints the filename. Simple.
The only problem is that qiv doesnt have a way to just check whether a JPEG file is corrupt (and if there is a command line utility that does, please let me know). To make it go thru the list, I wrote this little gem:
while(true); do xte "key q"; done
All this does is send the q key to the Xserver infinitely. All I have to do is put focus on the first qiv window to make it and all subsequent qiv windows receive q’s. So, just run it, and click on the window. Then there are lots of flashes, and eventually that perl script will print out the names of the bad files. It’s totally ghetto, but it’s the best I’ve got right now. The point of this post is to hopefully find new ways to do this more programmatically.
Tags: programming
Posted by hank,
Wed Nov 21 22:45:00 UTC 2007
I was on IRC tonight and someone was having trouble with their NASM homework. I decided to help them by learning NASM and coding up their homework problem for fun. It was pretty cool.
Continue Reading
Tags: programming
Posted by hank,
Sun Oct 07 13:35:00 UTC 2007
So, today I was stumbling around and I found an implementation of 99 bottles in LOLCODE! Wow, time to get the interpreter. I really need to make a deb for this, but that can wait. Anyway, first I tried some simple hello world sort of stuff:
BTW OMFG A LOLCODE!!oen!111
BTW THIS IS WROTE BY ERIK GREGG 10/07/07
BTW LOL FROM HTTP://WWW.RALREE.INFO
HAI
VISIBLE "HAI WURLD! LOL"
KTHXBYE
Then I moved on to something even more awesome…
Continue Reading
Tags: programming
Posted by hank,
Sun Jun 10 13:13:00 UTC 2007
Well, I was over at Debian Package of the Day when I noticed an article on KLone. It’s a little application framework that allows you to do XHTML templating in C! Then, you can compile it and send it off to any Linux machine (with a few dependencies of course) to run it. I got it, and it didn’t work for me at first. Then, for some reason, it started working. Here’s what I think did it:
In Ubuntu, I did this:
sudo apt-get install build-essential libssl-dev quilt klone klone-package
Then, I made a new test project:
make-klone-project create -p myhello
This creates a new project directory. Now, go into it and make it your new home:
cd myhello-0.1/
cd userdata/
mkdir www etc
vim etc/kloned.conf
I’m just going to assume you’re using vim because, well, you should be. Make the config file look something like this:
server_list my_http
allow_root yes
my_http
{
type http
addr.type IPv4
addr.port 8880
dir_root /www
}
Now lets give it something to work with (note we’re still in userdata):
vim www/index.klone
<html>
<head><title>Hello Lady!</title></head>
<body>
<% io_printf(out, "Hey, Lady! You call him Dr. Jones!"); %>
</body>
</html>
Now add your precious files to the sauce:
cd ../../site/
klone -c import ../userdata/
# 2 dirs and 2 files imported
cd ..
Now, compile and run it:
kloned-build -o myapp userdata
./myapp -F # This runs it in non-daemonized mode
If you don’t get any errors, congratulations. That means I did something right.
Now, just hop over to here or wherever you specified it to run, and it will magically appear.
Now you can do this:
<html>
<head><title>Hello World</title></head>
<body>
<%
int i;
for(i=0; i < 10; ++i) {
io_printf(out, "Hello Lady! %d<br />", i);
}
%>
</body>
</html>
Then run this to rebuild and re-run the server:
kloned-build -o myapp userdata && ./myapp -F
Update
So, I ran some tests, and I have to say, the speed increase from C might be really awesome every now and again. Here’s the code:
clock_t curtime = clock();
#define SEED 35791246
int niter=10000000;
double x,y;
int count=0; /* # of points in the 1st quadrant of unit circle */
double z;
double pi;
/* initialize random numbers */
srand(SEED);
count=0;
for ( i=0; i<niter; i++) {
x = (double)rand()/RAND_MAX;
y = (double)rand()/RAND_MAX;
z = x*x+y*y;
if (z<=1) count++;
}
pi=(double)count/niter*4;
io_printf(out, "# of trials= %d , estimate of pi is %g \n",niter,pi);
io_printf(out, "%f", (double)(clock() - curtime)/(double)CLOCKS_PER_SEC);
All this is is a Monte Carlo method of calculating pi that I stole from here. It takes 0.56 seconds of CPU time on my Core 2 Duo @ 3.3Ghz. Now for the Ruby on Rails test:
# Controller
@start = Time.now
srand(35791246)
iter = 10000000
count = 0
0.upto(iter) do |i|
x = rand().to_f
y = rand().to_f
z = x*x+y*y
count += 1 if z <= 1
end
@pi = count.to_f / iter * 4
@end = Time.now
This finishes in 20.75 seconds (about 40x slower). C is great for things like this. I hope to use KLone in the future for these kinds of tasks.
Tags: programming
Posted by hank,
Sat May 19 04:06:00 UTC 2007
I thought this was pretty cool:
for i in `seq -f "%03g" 1 100`; do wget http://www.gozerog.com/images/Hawking_$i.jpg; done
We were trying to do this the other night using bash, but to no avail since the square brackets only work for local file path expansion. I should have remembered seq. Also, this example shows how to 0-pad a series using seq and bash, noted by the *-f* option. Three cheers for seq!
Tags: programming
Posted by hank,
Thu May 03 14:16:00 UTC 2007
So, I got tired of typing in the dates to find a range of log messages. Here’s my solution:
# In ~/.bashrc
svn-log() {
case $1 in
yesterday | yes | y) svn log -r {`date -d yesterday +"%Y-%m-%d"`}:{`date +"%Y-%m-%d"`};;
*) echo "Invalid Option: $1";;
esac
}
I plan to add more to this later.
Tags: programming
Posted by hank,
Mon Apr 16 22:53:00 UTC 2007
Today, Will told me about some awesome image caching. I used it.
//Do some image caching
cached_image = Array(new Image(), new Image(), new Image(), new Image());
cached_image[0].src="image1.jpg";
cached_image[1].src="image2.jpg";
It’s amazing.
Tags: programming
Posted by hank,
Mon Mar 26 14:40:00 UTC 2007
I often find myself going to find scripts I’ve written that I want to edit, but I decided today I’d make things easier on myself:
hank@rura-penthe ~ $ cat bin/vimwhich
#!/bin/bash
vim `which $1`
All this does is shorten vim `which myscript` to vimwhich myscript. Helpful for just a couple lines of code.
Tags: programming
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