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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [posix/] [readdir_r.c] - Blame information for rev 207

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1 207 jeremybenn
#ifndef HAVE_OPENDIR
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/*
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 * Copyright (c) 1983 Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *      This product includes software developed by the University of
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 *      California, Berkeley and its contributors.
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 * 4. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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/* this code is modified from readdir.c by Jeff Johnston, June 5, 2002 */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)readdir.c   5.7 (Berkeley) 6/1/90";
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#endif /* LIBC_SCCS and not lint */
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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extern int getdents (int fd, void *dp, int count);
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/*
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 * get next entry in a directory using supplied dirent structure.
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 */
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int
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_DEFUN(readdir_r, (dirp, dp, dpp),
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        register DIR *dirp _AND
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        struct dirent *dp _AND
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        struct dirent **dpp) {
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struct dirent *tmpdp;
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#ifdef HAVE_DD_LOCK
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  __lock_acquire_recursive(dirp->dd_lock);
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#endif
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  if (dirp->dd_fd == -1) {
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    *dpp = NULL;
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    return errno = EBADF;
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  }
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  for (;;) {
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    if (dirp->dd_loc == 0) {
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      dirp->dd_size = getdents (dirp->dd_fd,
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                                dirp->dd_buf,
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                                dirp->dd_len);
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      if (dirp->dd_size <= 0) {
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#ifdef HAVE_DD_LOCK
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        __lock_release_recursive(dirp->dd_lock);
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#endif
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        *dpp = NULL;
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        return errno;
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      }
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    }
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    if (dirp->dd_loc >= dirp->dd_size) {
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      dirp->dd_loc = 0;
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      continue;
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    }
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    tmpdp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
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    memcpy (dp, tmpdp, sizeof(struct dirent));
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    if (dp->d_reclen <= 0 ||
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        dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) {
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#ifdef HAVE_DD_LOCK
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      __lock_release_recursive(dirp->dd_lock);
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#endif
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      *dpp = NULL;
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      return -1;
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    }
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    dirp->dd_loc += dp->d_reclen;
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    if (dp->d_ino == 0)
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      continue;
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#ifdef HAVE_DD_LOCK
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    __lock_release_recursive(dirp->dd_lock);
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#endif
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    *dpp = dp;
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    return 0;
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  }
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}
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#endif /* ! HAVE_OPENDIR */

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