usr/src/lib/libbc/libc/gen/common/seekdir.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1992 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/param.h>
  30 #include <dirent.h>
  31
  32 /*
  33  * seek to an entry in a directory.
  34  * Only values returned by "telldir" should be passed to seekdir.
  35  */
  36 void
  37 seekdir(dirp, tell)
  38         register DIR *dirp;
  39         register long tell;
  40 {
  41         extern long lseek();
  42         long curloc;
  43
  44         curloc = telldir(dirp);
  45         if (curloc == tell)
  46                 return;
  47         dirp->dd_loc = 0;
  48         (void) lseek(dirp->dd_fd, tell, 0);
  49         dirp->dd_size = 0;
  50         dirp->dd_off = tell;
  51 }
  52
  53 #undef  rewinddir
  54
  55 void
  56 rewinddir(dirp)
  57         DIR *dirp;
  58 {
  59         seekdir(dirp, 0);
  60 }