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/* $OpenBSD: dir.c,v 1.25 2022/01/08 06:49:41 guenther Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/stat.h>
#include <dirent.h>
#include <fcntl.h>
#include "syscall.h"
#include "util.h"
#include "dir.h"
struct _dl_dirdesc {
long dd_loc; /* offset in current buffer */
long dd_size; /* amount of data returned by getdents() */
char *dd_buf; /* data buffer */
int dd_len; /* size of data buffer */
int dd_fd; /* file descriptor associated with directory */
};
/*
* Open a directory.
*/
_dl_DIR *
_dl_opendir(const char *name)
{
_dl_DIR *dirp;
int fd;
struct stat sb;
if ((fd = _dl_open(name, O_RDONLY | O_DIRECTORY | O_CLOEXEC)) < 0)
return (NULL);
if (_dl_fstat(fd, &sb) || (dirp = _dl_malloc(sizeof(*dirp))) == NULL) {
_dl_close(fd);
return (NULL);
}
dirp->dd_fd = fd;
dirp->dd_loc = 0;
dirp->dd_size = 0;
dirp->dd_len = _dl_round_page(sb.st_blksize);
dirp->dd_buf = _dl_malloc(dirp->dd_len);
if (dirp->dd_buf == NULL) {
_dl_free(dirp);
_dl_close(fd);
return (NULL);
}
return (dirp);
}
/*
* close a directory.
*/
int
_dl_closedir(_dl_DIR *dirp)
{
int ret;
ret = _dl_close(dirp->dd_fd);
_dl_free(dirp->dd_buf);
_dl_free(dirp);
return ret;
}
/*
* get next entry in a directory.
*/
struct dirent *
_dl_readdir(_dl_DIR *dirp)
{
struct dirent *dp;
for (;;) {
if (dirp->dd_loc >= dirp->dd_size) {
dirp->dd_loc = 0;
}
if (dirp->dd_loc == 0) {
dirp->dd_size = _dl_getdents(dirp->dd_fd,
dirp->dd_buf, dirp->dd_len);
if (dirp->dd_size <= 0)
return (NULL);
}
dp = (struct dirent *)(dirp->dd_buf + dirp->dd_loc);
if ((long)dp & 03) /* bogus pointer check */
return (NULL);
if (dp->d_reclen <= 0 ||
dp->d_reclen > dirp->dd_len + 1 - dirp->dd_loc)
return (NULL);
dirp->dd_loc += dp->d_reclen;
if (dp->d_ino == 0)
continue;
return (dp);
}
}
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