source: trunk/libs/newlib/src/newlib/libc/sys/sysvi386/opendir.c

/*
 * Copyright (c) 1983 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. 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.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)opendir.c   5.11 (Berkeley) 2/23/91";
#endif /* LIBC_SCCS and not lint */

#include <dirent.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

/*
 * open a directory.
 */
DIR *
opendir(name)
        const char *name;
{
        register DIR *dirp;
        register int fd;

        if ((fd = open(name, 0)) == -1)
                return NULL;
        if (fcntl(fd, F_SETFD, 1) == -1 ||
            (dirp = (DIR *)malloc(sizeof(DIR))) == NULL) {
                close (fd);
                return NULL;
        }
        /*
         * If CLSIZE is an exact multiple of DIRBLKSIZ, use a CLSIZE
         * buffer that it cluster boundary aligned.
         * Hopefully this can be a big win someday by allowing page trades
         * to user space to be done by getdirentries()
         */
        dirp->dd_buf = malloc (512);
        dirp->dd_len = 512;

        if (dirp->dd_buf == NULL) {
                close (fd);
                return NULL;
        }
        dirp->dd_fd = fd;
        dirp->dd_loc = 0;
        dirp->dd_seek = 0;
        /*
         * Set up seek point for rewinddir.
         */
        return dirp;
}