#include <unistd.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("%*s%s/\n",depth,"",entry->d_name);

           

            printdir(entry->d_name,depth+4);

        }

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

    }

    chdir("..");

    closedir(dp);

}

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

{

    char *topdir, pwd[2]=".";

    if (argc != 2)

        topdir=pwd;

    else

        topdir=argv[1];

    printf("Directory scan of %s\n",topdir);

    printdir(topdir,0);

    printf("done.\n");

    exit(0);

}