* Copyright (c) 1983 Regents of the University of California.
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid
[] = "@(#)closedir.c 5.9 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */
* One of these structures is malloced to describe the current directory
* position each time telldir is called. It records the current magic
* cookie returned by getdirentries and the offset within the buffer
* associated with that return value.
struct ddloc
*loc_next
;/* next structure in list */
long loc_index
; /* key associated with structure */
long loc_seek
; /* magic cookie returned by getdirentries */
long loc_loc
; /* offset of entry in buffer */
static long dd_loccnt
= 0; /* Index of entry for sequential telldir's */
struct ddloc
*ptr
, *nextptr
;
for (ptr
= (struct ddloc
*)dirp
->dd_ddloc
; ptr
; ptr
= nextptr
) {
free((void *)dirp
->dd_buf
);
if ((fd
= open(name
, 0)) == -1)
if (fcntl(fd
, F_SETFD
, 1) == -1 ||
(dirp
= (DIR *)malloc(sizeof(DIR))) == NULL
) {
* If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
* buffer that it cluster boundary aligned.
* Hopefully this can be a big win someday by allowing page trades
* to user space to be done by getdirentries()
if ((CLSIZE
% DIRBLKSIZ
) == 0) {
dirp
->dd_buf
= malloc(CLSIZE
);
dirp
->dd_buf
= malloc(DIRBLKSIZ
);
dirp
->dd_len
= DIRBLKSIZ
;
if (dirp
->dd_buf
== NULL
) {
* get next entry in a directory.
register struct dirent
*dp
;
dirp
->dd_size
= getdirentries(dirp
->dd_fd
,
dirp
->dd_buf
, dirp
->dd_len
, &dirp
->dd_seek
);
if (dirp
->dd_loc
>= dirp
->dd_size
) {
dp
= (struct dirent
*)(dirp
->dd_buf
+ dirp
->dd_loc
);
if ((int)dp
& 03) /* bogus pointer check */
dp
->d_reclen
> dirp
->dd_len
+ 1 - dirp
->dd_loc
)
dirp
->dd_loc
+= dp
->d_reclen
;
(void)lseek(dirp
->dd_fd
, 0, 0);
* Seek to an entry in a directory.
* _seekdir is in telldir.c so that it can share opaque data structures.
register struct ddloc
**prevlp
;
register struct ddloc
*lp
;
prevlp
= (struct ddloc
**)&(dirp
->dd_ddloc
);
if (lp
->loc_index
== loc
)
if (lp
->loc_seek
!= dirp
->dd_seek
) {
if (lseek(dirp
->dd_fd
, lp
->loc_seek
, 0) == -1) {
dirp
->dd_seek
= lp
->loc_seek
;
while (dirp
->dd_loc
< lp
->loc_loc
) {
if (!(dp
= readdir(dirp
))) {
* return a pointer into a directory
register struct ddloc
*lp
, **fakeout
;
if (lp
= (struct ddloc
*)malloc(sizeof(struct ddloc
))) {
lp
->loc_index
= dd_loccnt
++;
lp
->loc_seek
= dirp
->dd_seek
;
lp
->loc_loc
= dirp
->dd_loc
;
lp
->loc_next
= dirp
->dd_ddloc
;
/* Compiler won't let us change anything pointed to by db directly */
/* So we fake to the left and do it anyway */
/* Wonder if the compile optomizes it to the correct solution */
fakeout
= (struct ddloc
**)&(dirp
->dd_ddloc
);