Question

This program is printing the directories at the root level

Directory_1
Directory_2

but I want to be able to print the directories within them too

Directory_1
   Directory_1_2
   Directory_1_3
Directory_2
   Directory 2_1
      Directory_2_1_1
Directory_4

I am trying to do it recursively but I am finding it hard to pass the Directory_1 as a root so it gets evaluated.. What am i missing?

Here is my output

..
.
Directory_1
Directory_2
Failed to open directory: No such file or directory

Code

#include <dirent.h>
#include <errno.h>
#include <stdio.h>
#include <sys/stat.h>

char *arg_temp;

int printDepthFirst(char *arg_tmp);

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

   if (argc != 2) {
      fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
      return 1; 
   }  


  arg_temp = argv[1]; 

  printDepthFirst(arg_temp);

}

int printDepthFirst(char *arg_tmp)
{

   struct dirent *direntp;
   DIR *dirp;

   if ((dirp = opendir(arg_tmp)) == NULL) {
      perror ("Failed to open directory");
      return 1;
   }  


   while ((direntp = readdir(dirp)) != NULL)
  {
   printf("%s\n", direntp->d_name);
   arg_tmp = direntp->d_name;
  }    
   printDepthFirst(arg_tmp);

  while ((closedir(dirp) == -1) && (errno == EINTR)) ;
     return 0;

}

Now, I know some people get irritated when asking questions that they think I am expecting them to code this, you dont need to, if you can tell me theoretically what i need to do.. I will research it although if its a small programmatically fix and you can post that I would really appreaciate it.. but if not.. I would also love to hear about what needs to be done in words..

Thank you

Answer 1

Well this should help:

#define _XOPEN_SOURCE 500
#include <ftw.h>
#include <stdio.h>

static int display_info(const char *fpath, const struct stat *sb,
             int tflag, struct FTW *ftwbuf)
{
    switch(tflag)
    {
        case FTW_D:
        case FTW_DP: puts(fpath); break;
    }
    return 0; /* To tell nftw() to continue */
}

int main(int argc, char *argv[])
{
    if (argc != 2) {
        fprintf(stderr, "Usage: %s directory_name\n", argv[0]);
        return 1; 
    }  

    int flags = FTW_DEPTH | FTW_MOUNT | FTW_PHYS;

    if (nftw(argv[1], display_info, 20, flags) == -1)
    {
        perror("nftw");
        return 255;
    }

    return 0;
}