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/* $OpenBSD: scandir.c,v 1.21 2019/06/28 13:32:41 deraadt 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.
*/
/*
* 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 <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "telldir.h"
#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
/*
* 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(const char *dirname, struct dirent ***namelist,
int (*select)(const struct dirent *),
int (*dcomp)(const struct dirent **, const struct dirent **))
{
struct dirent *d, *p, **names = NULL;
size_t nitems = 0;
struct stat stb;
long arraysz;
DIR *dirp;
if ((dirp = opendir(dirname)) == NULL)
return (-1);
if (fstat(dirp->dd_fd, &stb) == -1)
goto fail;
/*
* estimate the array size by taking the size of the directory file
* and dividing it by a multiple of the minimum size entry.
*/
arraysz = MAXIMUM(stb.st_size / 24, 16);
if (arraysz > SIZE_MAX / sizeof(struct dirent *)) {
errno = ENOMEM;
goto fail;
}
names = calloc(arraysz, sizeof(struct dirent *));
if (names == NULL)
goto fail;
while ((d = readdir(dirp)) != NULL) {
if (select != NULL && !(*select)(d))
continue; /* just selected names */
/*
* Check to make sure the array has space left and
* realloc the maximum size.
*/
if (nitems >= arraysz) {
struct dirent **nnames;
if (fstat(dirp->dd_fd, &stb) == -1)
goto fail;
arraysz *= 2;
if (SIZE_MAX / sizeof(struct dirent *) < arraysz)
goto fail;
nnames = reallocarray(names,
arraysz, sizeof(struct dirent *));
if (nnames == NULL)
goto fail;
names = nnames;
}
/*
* Make a minimum size copy of the data
*/
p = malloc(DIRSIZ(d));
if (p == NULL)
goto fail;
p->d_ino = d->d_ino;
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);
names[nitems++] = p;
}
closedir(dirp);
if (nitems && dcomp != NULL)
qsort(names, nitems, sizeof(struct dirent *),
(int(*)(const void *, const void *))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(const struct dirent **d1, const struct dirent **d2)
{
return(strcmp((*d1)->d_name, (*d2)->d_name));
}
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