Discussion - Minsta 1on1 Tournament

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

/************************************************************
 * This program will only run under Unixlike system. ~Bommel 2010.
 *
 * Compile with: gcc startrand.c -o startrand
 * Start with: ./startrand
 *
 * Output will be similiar too:
 *
 *
  ----- STARTPOSITIONS -----
  #01: Frr [PK] vs. Fimbultyr [AxG]
  #02: Sophie vs. [unconnected] Debugger
  #03: kojn vs. Slatte [PB]
  #04: Alexyk vs. [unconnected] Crrazzy rulezz
  #05: Mithos vs. Phil [PK]
  #06: Neo|1nk [eXile] vs. Radiohe4d [eXiLe]
  #07: Painkiller [PK] vs. UniT_4S6
  #08: Lucy [NK] vs. -maniac|Su- [prophets]
  #09: faszanatas|totenkopf|pb vs. c00kiemon5ter
  #10: Magoa [legends] vs. qbit [eXile]
  #11: Claymore vs. XV22
  #12: [unconnected] BizzyBeaver vs. Venom
  #13: 1nsane vs. [dtg] Nesquick
  #14: [BOT] Mirio vs. Mo [NK]
  #15: Vinc [prophets] vs. |Synchro
  #16: frozen soul [AxG] vs. Mara [NK]
 
 *
 *
 ************************************************************/

#define RANDOM_DEVICE "/dev/random"
#define SLOTS        32
#define ABS(a)          (((a) < 0) ? -(a) : (a))
#define READSIZE      unsigned char /* Set to 'int' if you need more than 255 slots */


/* Playernames that will be mapped to the numbers */
const char *playernames[SLOTS] =
{
    "Vinc [prophets]",
    "-maniac|Su- [prophets]",
    "Lucy [NK]",
    "Mara [NK]",
    "Slatte [PB]",
    "Painkiller [PK]",
    "UniT_4S6",
    "Phil [PK]",
    "qbit [eXile]",
    "Venom",
    "frozen soul [AxG]",
    "Mo [NK]",
    "faszanatas|totenkopf|pb",
    "Radiohe4d [eXiLe]",
    "[dtg] Nesquick",
    "Alexyk",
    "Magoa [legends]",
    "1nsane",
    "XV22",
    "Fimbultyr [AxG]",
    "Frr [PK]",
    "Sophie",
    "Mithos",
    "Claymore",
    "Neo|1nk [eXile]",
    "c00kiemon5ter",
    "[unconnected] BizzyBeaver",
    "[unconnected] Debugger",
    "[unconnected] Crrazzy rulezz",
    "[BOT] Mirio",
    "kojn",
    "|Synchro"
};

/* 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;
     
      /* tmp storage for numbers; one byte is enough for 32 slots */
      READSIZE ind;
 
      fillrandarr();
     
      for(; i < SLOTS; i++)
      {     
        do
        {
            /* Read random number as long theres one we dont have yet. */
            fread(&ind, sizeof(READSIZE), 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. %sn", ++ind,
                              playernames[randarr[i]],
                              playernames[randarr[i+1]]);
       
      return EXIT_SUCCESS;
  }
  else
  {
      /* We failed? Print why. */
      fprintf(stderr,"Failed to open Random device: ""RANDOM_DEVICE""n");
      return EXIT_FAILURE;
  }
}