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/* $OpenBSD: readdir.c,v 1.22 2015/09/12 13:34:22 guenther Exp $ */ |
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/* |
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* Copyright (c) 1983, 1993 |
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* The Regents of the University of California. 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. 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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#include <dirent.h> |
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#include <errno.h> |
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#include "telldir.h" |
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#include "thread_private.h" |
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/* |
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* get next entry in a directory. |
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*/ |
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int |
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_readdir_unlocked(DIR *dirp, struct dirent **result) |
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{ |
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struct dirent *dp; |
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*result = NULL; |
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1405892 |
for (;;) { |
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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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dirp->dd_size = getdents(dirp->dd_fd, dirp->dd_buf, |
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dirp->dd_len); |
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✓✓ |
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if (dirp->dd_size == 0) |
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return (0); |
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✗✓ |
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if (dirp->dd_size < 0) |
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return (-1); |
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} |
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dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc); |
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✓✗✗✓
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if ((long)dp & 03 || /* bogus pointer check */ |
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✓✗ |
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dp->d_reclen <= 0 || |
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dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc) { |
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errno = EINVAL; |
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return (-1); |
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} |
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dirp->dd_loc += dp->d_reclen; |
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✓✓ |
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if (dp->d_ino == 0) |
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continue; |
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dirp->dd_curpos = dp->d_off; |
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*result = dp; |
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return (0); |
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} |
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1405892 |
} |
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struct dirent * |
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readdir(DIR *dirp) |
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{ |
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struct dirent *dp; |
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✗✓ |
1405892 |
_MUTEX_LOCK(&dirp->dd_lock); |
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_readdir_unlocked(dirp, &dp); |
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✗✓ |
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_MUTEX_UNLOCK(&dirp->dd_lock); |
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return (dp); |
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} |
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DEF_WEAK(readdir); |