#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

int showDir(const char * path,int level)
{
 int i;
 struct stat infos;
 struct dirent * entry;
 DIR * dir=opendir(path);
 if(!dir) return(-1);
 do
 {
  entry=readdir(dir);
  if(entry)
  {
   char buffer[0x100];
   buffer[0]='\0';
   strcat(buffer,path);
   strcat(buffer,"/");
   strcat(buffer,entry->d_name);
   if(stat(buffer,&infos)!=-1)
   {
    if(S_ISDIR(infos.st_mode))
    {
     if(strcmp(entry->d_name,".")&&strcmp(entry->d_name,".."))
     {
      for(i=0;i<level;i++) fprintf(stderr,"    ");
      fprintf(stderr,"%s\n",entry->d_name);
      showDir(buffer,level+1);
     }
    }
    else if(S_ISREG(infos.st_mode))
    {
     for(i=0;i<level;i++) fprintf(stderr,"    ");
     fprintf(stderr,"%s\n",entry->d_name);
    }
   }
  }
 } while(entry);

 closedir(dir);

 return(0);
}

int main(int argc,char ** argv)
{
 const char * path=(argc>1 ? argv[1] : ".");
 showDir(path,0);
 return(0);
}