1  #include <stdio.h>
       2  #include <dirent.h>
       3  #include <stdlib.h>
       4  
       5  static int
       6  do_test (void)
       7  {
       8    DIR * dirp;
       9    long int save3 = 0;
      10    long int cur;
      11    int i = 0;
      12    int result = 0;
      13    struct dirent *dp;
      14    long int save0;
      15    long int rewind;
      16  
      17    dirp = opendir (".");
      18    if (dirp == NULL)
      19      {
      20        printf ("opendir failed: %m\n");
      21        return 1;
      22      }
      23  
      24    save0 = telldir (dirp);
      25    if (save0 == -1)
      26      {
      27        printf ("telldir failed: %m\n");
      28        result = 1;
      29      }
      30  
      31    for (dp = readdir (dirp); dp != NULL; dp = readdir (dirp))
      32      {
      33        /* save position 3 (after fourth entry) */
      34        if (i++ == 3)
      35  	save3 = telldir (dirp);
      36  
      37        printf ("%s\n", dp->d_name);
      38  
      39        /* stop at 400 (just to make sure dirp->__offset and dirp->__size are
      40  	 scrambled */
      41        if (i == 400)
      42  	break;
      43      }
      44  
      45    printf ("going back past 4-th entry...\n");
      46  
      47    /* go back to saved entry */
      48    seekdir (dirp, save3);
      49  
      50    /* Check whether telldir equals to save3 now.  */
      51    cur = telldir (dirp);
      52    if (cur != save3)
      53      {
      54        printf ("seekdir (d, %ld); telldir (d) == %ld\n", save3, cur);
      55        result = 1;
      56      }
      57  
      58    /* print remaining files (3-last) */
      59    for (dp = readdir (dirp); dp != NULL; dp = readdir (dirp))
      60      printf ("%s\n", dp->d_name);
      61  
      62    /* Check rewinddir */
      63    rewinddir (dirp);
      64    rewind = telldir (dirp);
      65    if (rewind == -1)
      66      {
      67        printf ("telldir failed: %m\n");
      68        result = 1;
      69      }
      70    else if (save0 != rewind)
      71      {
      72        printf ("rewinddir didn't reset directory stream\n");
      73        result = 1;
      74      }
      75  
      76    closedir (dirp);
      77    return result;
      78  }
      79  
      80  #define TEST_FUNCTION do_test ()
      81  #include "../test-skeleton.c"