LibertyBSD_kernel/sys/lib/libsa/readdir.c

/*	$OpenBSD: readdir.c,v 1.9 2014/11/19 20:28:56 miod Exp $	*/

/*
 * Copyright (c) 1996 Michael Shalayeff
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
 *
 */

#ifndef NO_READDIR

#include <sys/types.h>
#include <sys/stat.h>
#define _KERNEL
#include <sys/fcntl.h>
#undef _KERNEL
#include "stand.h"

int
opendir(const char *name)
{
	struct stat sb;
	int fd;

	if (stat(name, &sb) < 0)
		return -1;

	if (!S_ISDIR(sb.st_mode)) {
		errno = ENOTDIR;
		return -1;
	}

	/* XXX rewind needed for some dirs */
#ifdef __INTERNAL_LIBSA_CREAD
	if ((fd = oopen(name, O_RDONLY)) >= 0)
		olseek(fd, 0, 0);
#else
	if ((fd = open(name, O_RDONLY)) >= 0)
		lseek(fd, 0, SEEK_SET);
#endif

	return fd;
}

int
readdir(int fd, char *dest)
{
	struct open_file *f = &files[fd];

	if (fd < 0 || fd >= SOPEN_MAX ||
	    !((f = &files[fd])->f_flags & F_READ)) {
		errno = EBADF;
		return (-1);
	}

	if (f->f_flags & F_RAW) {
		errno = EOPNOTSUPP;
		return (-1);
	}
	if ((errno = (f->f_ops->readdir)(f, dest)))
		return (-1);

	return 0;
}

void
closedir(int fd)
{
#ifdef __INTERNAL_LIBSA_CREAD
	oclose(fd);
#else
	close(fd);
#endif
}

#endif /* NO_READDIR */