Makistos’s gists

Makistos / reading_sysfs_devices.c

Last active December 26, 2015 12:49

This code will print out all sysfs devices under a certain device class (which is supplied as a parameter). #linux #sysfs #c

	#include <sysfs/libsysfs.h>
	#include <stdio.h>

	/**
	* @brief Lists all the devices in the given class.
	*
	* @param className Name of the class (in /sys/class).
	*/
	void sysFsListDevices(char *className)
	{

Makistos / interpolate.c

Created October 25, 2013 12:30

This simple code snippet shows how interpolating can be done in C using signed integers. The for() loop determinest the range to interpolate from. In this case -100 to +100. For loop is here just to work as an example. 12th line is were the work is done. 256.0 is the top end of the range while 201.0 is the number of values in the list to be inte…

	#include <stdio.h>
	#include <math.h>

	int main()
	{
	int result;
	double x;
	int i;

	for (i=-100;i<101;i++)

Makistos / company_contrib.sh

Created October 25, 2013 12:37

This script will calculate how many lines of code a company or organization has submitted to a Git repo for a single revision. This is done using git blame with emails. Emali address is used to filter the lines to produce source code files that only contain lines by selected company. Blame output is then removed from these files and the resultin…

	#!/bin/bash

	TEMP_DIR=`mktemp -d`

	# Show counter if number of files is greater than this
	COUNTER_VISIBLE=1

	COMPANY=""
	SCRIPT=`basename $0`
	EXCLUDE_FILE="" # Name of exclude list file

Makistos / parse_change_files.sh

Created October 25, 2013 12:39

This script goes through .change files in the current directory and copies all the files listed to a different directory. It skips the _sources.change files as well. The obvious use is to copy the files so we can use "reprepro processincoming" to save packages to a repository.There are probably smarter ways to do this, but this is pretty portabl…

	#/bin/sh
	for CHANGEFILE in *.changes;
	do
	str=`echo $CHANGEFILE \| grep -v "source.changes"`
	if [ -z "$str" ]; then
	continue
	fi
	found="0"
	while read line
	do

Makistos / unhash_gitorious_paths.rb

Created October 25, 2013 12:42

The Gitorious repository hosting service, which you can install on your own server, hashes the Git repositories which makes it hard to link to them from other services. This script creates more readable links to those repositories. #git #gitorious #ruby #scm

	#!/usr/bin/ruby -d

	####
	#
	# create_unhashed_links.rb
	#
	# Creates links that are unhashed to the Gitorious repositories.
	# Helps link the repositories to Redmine.
	#
	# Spaces in project names are replaced with underscores.

Makistos / perl_formatter_example.pl

Created October 25, 2013 12:43

This is an example on how the Perl formatter works. #perl-format #perl

	#!/usr/bin/perl

	# This script takes something like this as input:
	# ID WorkId Date
	# 1 2 12-10-2009
	# 2 16 01-01-2008</pre>

	# And prints out this:
	#+-----+----------+---------------+
	#\|ID \|WorkId \|Date \|

Makistos / find_alsa_devices.c

Last active December 26, 2015 12:49

This script finds out ALSA devices in Linux programatically, which can be a bit tricky. #alsa #device-driver #linux #c

	/**
	* Reads audio devices from ALSA interface and returns count and array of
	* strings containing the devices.
	*
	* @param[out] count Number of devices found.
	* @param[out] Array of strings containing the device names.
	*
	*/
	static void getALSADevices(int count, char *devices)
	{

Makistos / hex_to_int.pl

Created October 25, 2013 12:45

This small script reads a memory dump that looks like 0x00 0xAB 0xFE 0x10 ... and converts it into 16 -254 171 0 ... I needed this to verify some code as I got two different outputs. Not only was the format different, endianess was as well. Converting from hex to int wasn't the problem, it was making Perl to understand that the values were signe…

	#!/usr/bin/perl

	my $byte_num = 0;
	my @vals;

	while(<>)
	{
	chomp;
	$vals[$byte_num] = unpack('c', pack 's', hex($_));
	$byte_num++;

Makistos / mysqlConn.java

Created October 28, 2013 07:34

This little function will create a connection to a MySql database in the local machine. Database and user name and password are supplied as parameters. #mysql #java

	private void initDb(String db, String user, String pw) {
	String url = "jdbc:mysql://localhost/" + db;

	try {
	Class.forName("com.mysql.jdbc.Driver").newInstance();
	con = DriverManager.getConnection(url, user, pw);
	if (con.isClosed()) {
	System.err.println("Failed to connecto to " + db);
	}
	}

Makistos / checkIsbn.java

Created October 28, 2013 07:35

This code will check both ISBN-10 and ISBN-13 codes for validity. String length, characters and check digit are checked. Java regexp class is used, so this is an example on how to use it, too. #isbn #regexp #java

	import java.util.regex.*;

	/**
	* @brief This class is used to verify that input is a valid ISBN (International
	* Standard Book Number).
	*
	* @note Invalid ISBN-13 codes have been published in books! Do not assume
	* that just because this returns false for an existing ISBN, there is a bug.
	* Verify with e.g. Amazon that the ISBN is correct first.
	*

Marko Makistos