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/* $OpenBSD: scandir.c,v 1.21 2019/06/28 13:32:41 deraadt Exp $ */
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* This is a modified verision of scandir that takes an explicit
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* directory file descriptor as parameter.
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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* Scan the directory fd calling select to make a list of selected
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* directory entries then sort using qsort and compare routine dcomp.
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* Returns the number of entries and a pointer to a list of pointers to
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* struct dirent (through namelist). Returns -1 if there were any errors.
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#include "gmid.h"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#define MAXIMUM(a, b) (((a) > (b)) ? (a) : (b))
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* The DIRSIZ macro is the minimum record length which will hold the directory
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* entry. This requires the amount of space in struct dirent without the
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* d_name field, plus enough space for the name and a terminating nul byte
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* (dp->d_namlen + 1), rounded up to a 4 byte boundary.
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#undef DIRSIZ
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#define DIRSIZ(dp, namlen) \
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((sizeof(struct dirent) - sizeof(dp)->d_name) + \
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((namlen + 1 + 3) &~ 3))
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scandir_fd(int fd, struct dirent ***namelist,
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int (*select)(const struct dirent *),
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int (*dcomp)(const struct dirent **, const struct dirent **))
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struct dirent *d, *p, **names = NULL;
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size_t arraysz, namlen, nitems = 0;
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struct stat stb;
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DIR *dirp;
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if ((dirp = fdopendir(fd)) == NULL)
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return (-1);
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if (fstat(fd, &stb) == -1)
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goto fail;
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* estimate the array size by taking the size of the directory file
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* and dividing it by a multiple of the minimum size entry.
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arraysz = MAXIMUM(stb.st_size / 24, 16);
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if (arraysz > SIZE_MAX / sizeof(struct dirent *)) {
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errno = ENOMEM;
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goto fail;
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names = calloc(arraysz, sizeof(struct dirent *));
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if (names == NULL)
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goto fail;
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while ((d = readdir(dirp)) != NULL) {
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if (select != NULL && !(*select)(d))
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continue; /* just selected names */
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* Check to make sure the array has space left and
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* realloc the maximum size.
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if (nitems >= arraysz) {
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struct dirent **nnames;
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if (fstat(fd, &stb) == -1)
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goto fail;
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arraysz *= 2;
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if (SIZE_MAX / sizeof(struct dirent *) < arraysz)
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goto fail;
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nnames = reallocarray(names,
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arraysz, sizeof(struct dirent *));
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if (nnames == NULL)
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goto fail;
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names = nnames;
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* Make a minimum size copy of the data
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namlen = strlen(d->d_name);
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p = malloc(DIRSIZ(d, namlen));
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if (p == NULL)
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goto fail;
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p->d_ino = d->d_ino;
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p->d_type = d->d_type;
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memcpy(p->d_name, d->d_name, namlen + 1);
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names[nitems++] = p;
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closedir(dirp);
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if (nitems && dcomp != NULL)
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qsort(names, nitems, sizeof(struct dirent *),
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(int(*)(const void *, const void *))dcomp);
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*namelist = names;
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return (nitems);
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while (nitems > 0)
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free(names[--nitems]);
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free(names);
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closedir(dirp);
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return (-1);
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select_non_dot(const struct dirent *d)
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return strcmp(d->d_name, ".");
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select_non_dotdot(const struct dirent *d)
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return strcmp(d->d_name, ".") && strcmp(d->d_name, "..");
