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

/**
 * This program will only run under Unixlike system. ~Bommel.
 **/

#define RANDOM_DEVICE "/dev/random" 
#define SLOTS         16
#define ABS(a)        (((a) < 0) ? -(a) : (a))


/* Playernames */
const char *playernames[SLOTS] =
{
     "Vinc [prophets]",
     "-maniac|Su- [prophets]",
     "Lucy [NK]",
     "Mara [NK]",
     "Slatte [PB]",
     "Painkiller [PK]",
     "UniT_4S6",
     "Phil [PK]",
     "qbit",
     "frozen soul [AxG]",
     "Mo [NK] // magoa",
     "totenkopf|pb",
     "Radiohe4d [eXiLe]",
     "[dtg] Nesquick",
     "Venom",
     "Alexyk"
};

/* Here the random numbers are stored */
int randarr[SLOTS];

/* Check if the given number is already in the list */
static int twice(int numb, int index)
{
    int y = 0;
    for(; y < SLOTS; y++)
        if(randarr[y] == numb && index != y)
            return 1;

    return 0;
}

/* Fill randarr with -1s */
static void fillrandarr(void)
{
    int y = 0;
    for(; y < SLOTS; y++)
        randarr[y] = -1;
}

int main(void)
{
    FILE *pF;
    pF = fopen(RANDOM_DEVICE,"r");

    if(pF)
    {
        int i = 0;
        int ind;

        fillrandarr();

        for(; i < SLOTS; i++)
        {
            do
            {
                /* Read random number as long theres one we dont have yet. */
                fread(&ind, sizeof(int), 1, pF);
                randarr[i] =  ABS(ind % SLOTS);
            }
            while(twice(randarr[i],i) );
        }
        fclose(pF);

        /* Announce: */
        printf("\n----- STARTPOSITIONS -----\n");

        ind = 0;
        for(i = 0; i < SLOTS; i = i+2)
            printf("#%.2d: %s vs. %s\n", ++ind,
                                         playernames[randarr[i]],
                                         playernames[randarr[i+1]]);

        return EXIT_SUCCESS;
    }
    else
    {
        /* We failed? Print why. */
        fprintf(stderr,"Failed to open Random device:\n");
        fprintf(stderr,"EC[%d]: %s\n",errno, strerror(errno));
        return EXIT_SUCCESS;
    }
}