#include <stdio.h>

int main(int argc, char* argv[])
{
  int fn=0, fu=0, fd=8;
  FILE* fp = stdin;
  int i, j;
  
  for(i=1; i< argc; ++i)
  {
    if(argv[i][0] == '-')
    {
      int ii = i;  //elmentjuk az i erteket es az indexelesnel ezt hasznaljuk
      for(j=1; argv[ii][j] != '\0'; ++j)
      {
        switch(argv[ii][j])
        {
          case 'n': fn = 1; break;
          case 'u': fu = 1; break;
          case 'd': fd = atoi(argv[ii+1]); ++i; break;
        }
      }
    }
    else
    {
      fp = fopen(argv[i], "r");
    }
  }
  
  int ch;
  int db=0;
  char* format = fu ? "%02X " : "%02x "; //igy mindig ket karakteren irja ki az adott karakter ascii kodjat hexaban.
  
  while( (ch = fgetc(fp)) != EOF)
  {
    if(fn && (db % fd) == 0)
      printf("%d: ",db);
    
    printf(format, ch);
    
    ++db;
    if( (db % fd) == 0 )
      printf("\n");    
  }
  
  if(fp != stdin)
    fclose(fp);
  
  return 0;    
}