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#include <unistd.h>

#include <stdlib.h>

#include <stdio.h>

#include <dirent.h>

#include <string.h>

#include <sys/stat.h>

void printdir(char *dir,int depth)

{

    DIR *dp;

    struct dirent *entry;

    struct stat statbuf;

    if((dp=opendir(dir))==NULL)

    {

        fprintf(stderr,"cannot open directory:%s\n",dir);

         return;

    }

    chdir(dir);

    while((entry=readdir(dp))!=NULL)

    {

        lstat(entry->d_name,&statbuf);

        if(S_ISDIR(statbuf.st_mode))

        {

            if((strcmp(".",entry->d_name)==0)||(strcmp("..",entry->d_name)==0))

continue;

            printf("%d  %s\n",depth,entry->d_name);

            printdir(entry->d_name,depth+=1);

         }

        else

            printf("%d  %s\n",depth,entry->d_name);

    }

    chdir("..");

    closedir(dp);

}

int main(int argc,char * argv[])

{

     printf("doing\n");

     char *topdir=".";

     if(argc>1)

         topdir=argv[1];

    printdir("/home/cqh/Downloads",0);

    printf("done\n");

   exit(0);

}