/*****************************************************************************
 * C Program illustrating how to handle directories                          *
 * Written by: Abhijit Das                                                   *
 * Last updated: October 15, 2008                                            *
 *****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <dirent.h>

int main (int argc, char *argv[])
{
   char dname[1024];    /* string to store the name of a directory */
   DIR *dp;             /* directory pointer */
   struct dirent *dep;  /* pointer to a directory entry */

   if (argc == 1) {     /* Ask the user to enter a directory name */
      printf("Enter the absolute name of a directory: ");
      scanf("%s", dname);
   } else {             /* Directory name supplied as a command-line argument */
      strcpy(dname,argv[1]);
   }

   dp = (DIR *)opendir(dname);       /* open directory */
   if (dp == NULL) {
      fprintf(stderr, "Error: Unable to open directory...\n");
      exit(1);
   }

   printf("sizeof(struct dirent) = %d\n", sizeof(struct dirent));

   while (1) {
      dep = readdir(dp);             /* read next directory entry */
      if (dep == NULL) break;        /* no further files in the directory */
      printf("%32s  ", dep->d_name); /* print the name of the file */
      switch (dep->d_type) {         /* print the type of the file */
         case DT_BLK: printf("[block device]\n"); break;
         case DT_CHR: printf("[character device]\n"); break;
         case DT_DIR: printf("[directory]\n"); break;
         case DT_FIFO: printf("[named pipe]\n"); break;
         case DT_LNK: printf("[symbolic link]\n"); break;
         case DT_REG: printf("[regular file]\n"); break;
         case DT_SOCK: printf("[socket]\n"); break;
         default: printf("[unknown]\n");
      }
   }

   closedir(dp);                     /* close the open directory handle */

   exit(0);
}