158 lines
4.7 KiB
C
158 lines
4.7 KiB
C
#ifndef HAVE_OPENDIR
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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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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*
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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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*
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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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*/
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#include <sys/cdefs.h>
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__SCCSID("@(#)scandir.c 8.3 (Berkeley) 1/2/94");
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__FBSDID("$FreeBSD: head/lib/libc/gen/scandir.c 335898 2018-07-03 17:31:45Z jhb $");
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/*
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* Scan the directory dirname 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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*/
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#include <stddef.h>
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#include <dirent.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/lock.h>
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/*
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* The DIRSIZ macro gives the minimum record length which will hold
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* the directory entry. This requires the amount of space in struct dirent
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* without the d_name field, plus enough space for the name with a terminating
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* null byte (dp->d_namlen+1), rounded up to a 4 byte boundary.
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*/
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#undef DIRSIZ
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#ifdef _DIRENT_HAVE_D_NAMLEN
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#define DIRSIZ(dp) \
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(offsetof (struct dirent, d_name) + (((dp)->d_namlen+1 + 3) &~ 3))
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#else
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#define DIRSIZ(dp) \
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(offsetof (struct dirent, d_name) + ((strlen((dp)->d_name)+1 + 3) &~ 3))
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#endif
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int
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scandir(const char *dirname, struct dirent ***namelist,
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int (*select)(const struct dirent *), int (*dcomp)(const struct dirent **,
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const struct dirent **))
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{
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register struct dirent *d, *p, **names = NULL;
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register size_t arraysz, numitems;
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DIR *dirp;
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if ((dirp = opendir(dirname)) == NULL)
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return(-1);
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#ifdef HAVE_DD_LOCK
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__lock_acquire_recursive(dirp->dd_lock);
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#endif
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numitems = 0;
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arraysz = 32; /* initial estimate of the array size */
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names = (struct dirent **)malloc(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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/*
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* Make a minimum size copy of the data
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*/
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p = (struct dirent *)malloc(DIRSIZ(d));
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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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#ifdef DT_UNKNOWN
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p->d_type = d->d_type;
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#endif
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p->d_reclen = d->d_reclen;
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#ifdef _DIRENT_HAVE_D_NAMLEN
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p->d_namlen = d->d_namlen;
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bcopy(d->d_name, p->d_name, p->d_namlen + 1);
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#else
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strcpy(p->d_name, d->d_name);
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#endif
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/*
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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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*/
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if (numitems >= arraysz) {
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struct dirent **names2;
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names2 = reallocarray(names, arraysz,
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2 * sizeof(struct dirent *));
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if (names2 == NULL) {
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free(p);
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goto fail;
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}
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names = names2;
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arraysz *= 2;
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}
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names[numitems++] = p;
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}
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closedir(dirp);
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if (numitems && dcomp != NULL)
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qsort(names, numitems, sizeof(struct dirent *), (void *)dcomp);
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*namelist = names;
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#ifdef HAVE_DD_LOCK
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__lock_release_recursive(dirp->dd_lock);
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#endif
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return (numitems);
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fail:
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while (numitems > 0)
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free(names[--numitems]);
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free(names);
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closedir(dirp);
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#ifdef HAVE_DD_LOCK
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__lock_release_recursive(dirp->dd_lock);
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#endif
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return (-1);
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}
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/*
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* Alphabetic order comparison routine for those who want it.
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* POSIX 2008 requires that alphasort() uses strcoll().
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*/
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int
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alphasort(const struct dirent **d1, const struct dirent **d2)
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{
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return (strcoll((*d1)->d_name, (*d2)->d_name));
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}
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#endif /* ! HAVE_OPENDIR */
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