dirent/tst-seekdir.c

   1 #include <stdio.h>
   2 #include <dirent.h>
   3 #include <stdlib.h>
   4
   5 int
   6 main (int argc, char *argv[])
   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
  15   dirp = opendir (".");
  16   for (dp = readdir (dirp); dp != NULL; dp = readdir (dirp))
  17     {
  18       /* save position 3 (after fourth entry) */
  19       if (i++ == 3)
  20         save3 = telldir (dirp);
  21
  22       printf ("%s\n", dp->d_name);
  23
  24       /* stop at 400 (just to make sure dirp->__offset and dirp->__size are
  25          scrambled */
  26       if (i == 400)
  27         break;
  28     }
  29
  30   printf ("going back past 4-th entry...\n");
  31
  32   /* go back to saved entry */
  33   seekdir (dirp, save3);
  34
  35   /* Check whether telldir equals to save3 now.  */
  36   cur = telldir (dirp);
  37   if (cur != save3)
  38     {
  39       printf ("seekdir (d, %ld); telldir (d) == %ld\n", save3, cur);
  40       result = 1;
  41     }
  42
  43   /* print remaining files (3-last) */
  44   for (dp = readdir (dirp); dp != NULL; dp = readdir (dirp))
  45     printf ("%s\n", dp->d_name);
  46
  47
  48   closedir (dirp);
  49   return result;
  50 }