/*
   Jaren Rowan
   COMP 322/L
   Project 5
*/

#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <dirent.h>
#include <limits.h>

static void
listdir (const char * dir_name){
    DIR * dir;

    /* Open the directory specified by "dir_name". */
    dir = opendir (dir_name);

    /* Check it was opened. */
    if (! dir){
        fprintf (stderr, "Cannot open directory '%s': %s\n", dir_name, strerror (errno));
        exit (EXIT_FAILURE);
    }

    while (1){
        struct dirent * entry;
        const char * d_name;

        /* "Readdir" gets subsequent entries from "d". */
        entry = readdir (dir);
        if (! entry) {
            /* There are no more entries in this directory, so break
               out of the while loop. */
            break;
        }
        d_name = entry->d_name;

        if(entry->d_type & DT_DIR) {

            /* Check that the directory is not "d" or d's parent. */

            if(strcmp (d_name, "..") != 0 && strcmp (d_name, ".") != 0) {
                int path_length;
                char path[PATH_MAX];

                path_length = snprintf (path, PATH_MAX,"%s/%s", dir_name, d_name);
                printf ("%s\n", d_name);
                if (path_length >= PATH_MAX) {
                    fprintf (stderr, "Path length has got too long.\n");
                    exit (EXIT_FAILURE);
                }
                /* Recursively call "listdir" with the next. */
                listdir (path);
            }
         }
    }
    /* After going through all the entries, close the directory. */
    if (closedir (dir)) {
        fprintf (stderr, "Could not close '%s': %s\n",dir_name, strerror (errno));
        exit (EXIT_FAILURE);
    }
}

int main(int argc, char **argv) {
  int x = 1;

  if (argc == 1)
    listdir(".");

  while (++x <= argc){
    listdir(argv[x-1]);
  }

  return 0;
}