lib/libstand/readdir.c

   1 /*-
   2  * Copyright (c) 1999,2000 Jonathan Lemon <jlemon@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  *      $FreeBSD: src/lib/libstand/readdir.c,v 1.1.2.1 2000/05/04 13:47:52 ps Exp $
  27  *      $DragonFly: src/lib/libstand/readdir.c,v 1.2 2003/06/17 06:26:51 dillon Exp $
  28  */
  29
  30 #include <sys/param.h>
  31 #include "stand.h"
  32
  33 struct dirent *
  34 readdirfd(int fd)
  35 {
  36         static struct dirent dir;               /* XXX not thread safe */
  37         struct open_file *f = &files[fd];
  38
  39         if ((unsigned)fd >= SOPEN_MAX || !(f->f_flags & F_READ)) {
  40                 errno = EBADF;
  41                 return (NULL);
  42         }
  43         if (f->f_flags & F_RAW) {
  44                 errno = EIO;
  45                 return (NULL);
  46         }
  47         errno = (f->f_ops->fo_readdir)(f, &dir);
  48         if (errno)
  49                 return (NULL);
  50         return (&dir);
  51 }