#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <syslog.h>
#include <string.h>
#include <sys/types.h>
#include <sys/sysinfo.h>
#include <sched.h>
 
void *thread_function(void *arg) {
    openlog(NULL, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_USER);
    syslog(LOG_INFO, "[COURSE:1][ASSIGNMENT:1] Hello World from Thread!");
    closelog();
    pthread_exit(NULL);
}
 
int main() {
    openlog(NULL, LOG_CONS | LOG_PID | LOG_NDELAY, LOG_USER);
 
    // Print uname -a output to syslog
    FILE *uname_output = popen("uname -a", "r");
    if (uname_output) {
        char buffer[256];
        while (fgets(buffer, sizeof(buffer), uname_output) != NULL) {
            strtok(buffer, "\n"); // Removing trailing newline character
            syslog(LOG_INFO, "[COURSE:1][ASSIGNMENT:1] %s", buffer);
        }
        pclose(uname_output);
    }
 
    syslog(LOG_INFO, "[COURSE:1][ASSIGNMENT:1] Hello World from Main!");
 
    pthread_t thread;
    pthread_create(&thread, NULL, thread_function, NULL);
    pthread_join(thread, NULL);
 
    closelog();
    return 0;
}
 

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/*  Berechnung des Hamming-Abstandes zwischen zwei 128-Bit Werten in 	*/
/*	einer Textdatei. 													*/
/*  Die Werte müssen auf einer separaten Zeile gespeichert sein			*/
/* 																		*/
/*	Erstellt: 17.5.2010													*/
/*  Autor: Thomas Scheffler												*/

#include <stdio.h>
#include <stdlib.h>

#define ARRAY_SIZE 32

unsigned Hamdist(unsigned x, unsigned y)
{
  unsigned dist = 0, val = x ^ y;
 
  // Count the number of set bits
  while(val)
  {
    ++dist; 
    val &= val - 1;
  }
 
  return dist;
}



int main (void)
{
	char hex;
	int i;
	int a[ARRAY_SIZE];
	int b[ARRAY_SIZE];
	int hamDist = 0;
	FILE* fp;
	
	//Arrays mit 0 initialisieren
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
  		a[i] = 0;
  		b[i] = 0;
	}

	
	fp = fopen("hex.txt","r");
	if (fp == NULL) 
	{
		printf("Die Datei hex.txt wurde nicht gefunden!");
		exit(EXIT_FAILURE);
	}

	i=0;
	printf("1.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
        a[i]=strtol(&hex,0,16);
		i++;
    }
	i=0;
	printf("2.Zeile einlesen.\n");

 	while((hex=fgetc(fp))!='\n' && hex != EOF)
    {
    	b[i]=strtol(&hex,0,16);
        i++;
    }
	fclose(fp);

	printf("Hamming-Abweichung pro Nibble:\n");
	for (i = 0; i < ARRAY_SIZE; ++i)
	{
		printf ("%i\t%i\t%i\n",a[i],b[i],Hamdist(a[i],b[i]));
		hamDist += Hamdist(a[i],b[i]);
	}
	printf ("\nHamming-Abweichung der Hash-Werte:%d\n",hamDist);
}