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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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#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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extern int getdents (int fd, void *dp, int count);
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/*
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* get next entry in a directory.
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*/
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struct dirent *
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_DEFUN(readdir, (dirp),
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register DIR *dirp)
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{
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register struct dirent *dp;
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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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return NULL;
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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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return NULL;
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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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dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
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if ((int)dp & 03) { /* bogus pointer check */
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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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return NULL;
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}
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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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return NULL;
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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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return (dp);
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}
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}
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#endif /* ! HAVE_OPENDIR */
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