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#ifndef HAVE_OPENDIR
/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* 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/cdefs.h>
__SCCSID("@(#)scandir.c 8.3 (Berkeley) 1/2/94");
__FBSDID("$FreeBSD: head/lib/libc/gen/scandir.c 335898 2018-07-03 17:31:45Z jhb $");
/*
* 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 <stddef.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <sys/lock.h>
/*
* The DIRSIZ macro gives 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 with a terminating
* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
*/
#undef DIRSIZ
#ifdef _DIRENT_HAVE_D_NAMLEN
#define DIRSIZ(dp) \
(offsetof (struct dirent, d_name) + (((dp)->d_namlen+1 + 3) &~ 3))
#else
#define DIRSIZ(dp) \
(offsetof (struct dirent, d_name) + ((strlen((dp)->d_name)+1 + 3) &~ 3))
#endif
int
scandir(const char *dirname, struct dirent ***namelist,
int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **,
const struct dirent **))
{
register struct dirent *d, *p, **names = NULL;
register size_t arraysz, numitems;
DIR *dirp;
if ((dirp = opendir(dirname)) == NULL)
return(-1);
#ifdef HAVE_DD_LOCK
__lock_acquire_recursive(dirp->dd_lock);
#endif
numitems = 0;
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_ino = d->d_ino;
#ifdef DT_UNKNOWN
p->d_type = d->d_type;
#endif
p->d_reclen = d->d_reclen;
#ifdef _DIRENT_HAVE_D_NAMLEN
p->d_namlen = d->d_namlen;
bcopy(d->d_name, p->d_name, p->d_namlen + 1);
#else
strcpy(p->d_name, d->d_name);
#endif
/*
* Check to make sure the array has space left and
* realloc the maximum size.
*/
if (numitems >= arraysz) {
struct dirent **names2;
names2 = reallocarray(names, arraysz,
2 * sizeof(struct dirent *));
if (names2 == NULL) {
free(p);
goto fail;
}
names = names2;
arraysz *= 2;
}
names[numitems++] = p;
}
closedir(dirp);
if (numitems && dcomp != NULL)
qsort(names, numitems, sizeof(struct dirent *), (void *)dcomp);
*namelist = names;
#ifdef HAVE_DD_LOCK
__lock_release_recursive(dirp->dd_lock);
#endif
return (numitems);
fail:
while (numitems > 0)
free(names[--numitems]);
free(names);
closedir(dirp);
#ifdef HAVE_DD_LOCK
__lock_release_recursive(dirp->dd_lock);
#endif
return (-1);
}
/*
* Alphabetic order comparison routine for those who want it.
* POSIX 2008 requires that alphasort() uses strcoll().
*/
int
alphasort(const struct dirent **d1, const struct dirent **d2)
{
return (strcoll((*d1)->d_name, (*d2)->d_name));
}
#endif /* ! HAVE_OPENDIR */
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