4.3BSD - /usr/src/new/mh/miscellany/libndir/seekdir.c

   1: static char sccsid[] = "@(#)seekdir.c 4.9 3/25/83";
   2: 
   3: #include <sys/param.h>
   4: #include <dir.h>
   5: 
   6: /*
   7:  * seek to an entry in a directory.
   8:  * Only values returned by "telldir" should be passed to seekdir.
   9:  */
  10: void
  11: seekdir(dirp, loc)
  12:     register DIR *dirp;
  13:     long loc;
  14: {
  15:     long curloc, base, offset;
  16:     struct direct *dp;
  17:     extern long lseek();
  18: 
  19:     curloc = telldir(dirp);
  20:     if (loc == curloc)
  21:         return;
  22:     base = loc & ~(DIRBLKSIZ - 1);
  23:     offset = loc & (DIRBLKSIZ - 1);
  24:     (void) lseek(dirp->dd_fd, base, 0);
  25:     dirp->dd_loc = 0;
  26:     while (dirp->dd_loc < offset) {
  27:         dp = readdir(dirp);
  28:         if (dp == NULL)
  29:             return;
  30:     }
  31: }

Defined functions

Defined variables