18798c64f0
of the array length needed to store all the directory entries. Although BSD has historically guaranteed that st_size is the size of the directory file, POSIX does not, and more to the point, some recent filesystems such as ZFS use st_size to mean something else. The fix is to not stat the directory at all, set the initial array size to 32 entries, and realloc it in powers of 2 if that proves insufficient. PR: 113668
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
|
|
* 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.
|
|
* 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
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#if defined(LIBC_SCCS) && !defined(lint)
|
|
static char sccsid[] = "@(#)scandir.c 8.3 (Berkeley) 1/2/94";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Scan the directory dirname calling select to make a list of selected
|
|
* directory entries then sort using qsort and compare routine dcomp.
|
|
* Returns the number of entries and a pointer to a list of pointers to
|
|
* struct dirent (through namelist). Returns -1 if there were any errors.
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include <dirent.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include "un-namespace.h"
|
|
|
|
/*
|
|
* The DIRSIZ macro is the minimum record length which will hold the directory
|
|
* entry. This requires the amount of space in struct dirent without the
|
|
* d_name field, plus enough space for the name and a terminating nul byte
|
|
* (dp->d_namlen + 1), rounded up to a 4 byte boundary.
|
|
*/
|
|
#undef DIRSIZ
|
|
#define DIRSIZ(dp) \
|
|
((sizeof(struct dirent) - sizeof(dp)->d_name) + \
|
|
(((dp)->d_namlen + 1 + 3) &~ 3))
|
|
|
|
int
|
|
scandir(dirname, namelist, select, dcomp)
|
|
const char *dirname;
|
|
struct dirent ***namelist;
|
|
int (*select)(struct dirent *);
|
|
int (*dcomp)(const void *, const void *);
|
|
{
|
|
struct dirent *d, *p, **names = NULL;
|
|
size_t nitems = 0;
|
|
long arraysz;
|
|
DIR *dirp;
|
|
|
|
if ((dirp = opendir(dirname)) == NULL)
|
|
return(-1);
|
|
|
|
arraysz = 32; /* initial estimate of the array size */
|
|
names = (struct dirent **)malloc(arraysz * sizeof(struct dirent *));
|
|
if (names == NULL)
|
|
goto fail;
|
|
|
|
while ((d = readdir(dirp)) != NULL) {
|
|
if (select != NULL && !(*select)(d))
|
|
continue; /* just selected names */
|
|
/*
|
|
* Make a minimum size copy of the data
|
|
*/
|
|
p = (struct dirent *)malloc(DIRSIZ(d));
|
|
if (p == NULL)
|
|
goto fail;
|
|
p->d_fileno = d->d_fileno;
|
|
p->d_type = d->d_type;
|
|
p->d_reclen = d->d_reclen;
|
|
p->d_namlen = d->d_namlen;
|
|
bcopy(d->d_name, p->d_name, p->d_namlen + 1);
|
|
/*
|
|
* Check to make sure the array has space left and
|
|
* realloc the maximum size.
|
|
*/
|
|
if (nitems >= arraysz) {
|
|
struct dirent **names2;
|
|
|
|
names2 = (struct dirent **)realloc((char *)names,
|
|
(arraysz * 2) * sizeof(struct dirent *));
|
|
if (names2 == NULL) {
|
|
free(p);
|
|
goto fail;
|
|
}
|
|
names = names2;
|
|
arraysz *= 2;
|
|
}
|
|
names[nitems++] = p;
|
|
}
|
|
closedir(dirp);
|
|
if (nitems && dcomp != NULL)
|
|
qsort(names, nitems, sizeof(struct dirent *), dcomp);
|
|
*namelist = names;
|
|
return(nitems);
|
|
|
|
fail:
|
|
while (nitems > 0)
|
|
free(names[--nitems]);
|
|
free(names);
|
|
closedir(dirp);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* Alphabetic order comparison routine for those who want it.
|
|
*/
|
|
int
|
|
alphasort(d1, d2)
|
|
const void *d1;
|
|
const void *d2;
|
|
{
|
|
return(strcmp((*(struct dirent **)d1)->d_name,
|
|
(*(struct dirent **)d2)->d_name));
|
|
}
|