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Initial revision

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that: (1) source distributions retain this entire copyright
 * notice and comment, and (2) distributions including binaries display
 * the following acknowledgement:  ``This product includes software
 * developed by the University of California, Berkeley and its contributors''
 * in the documentation or other materials provided with the distribution
 * and in all advertising materials mentioning features or use of this
 * software. 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 ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)opendir.c	5.10 (Berkeley) 6/1/90";
#endif /* LIBC_SCCS and not lint */

#include <sys/param.h>
#include <dirent.h>
#include <fcntl.h>

char *malloc();
long _rewinddir;

/*
 * open a directory.
 */
DIR *
opendir(name)
	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()
	 */
	if ((CLSIZE % DIRBLKSIZ) == 0) {
		dirp->dd_buf = malloc(CLSIZE);
		dirp->dd_len = CLSIZE;
	} else {
		dirp->dd_buf = malloc(DIRBLKSIZ);
		dirp->dd_len = DIRBLKSIZ;
	}
	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.
	 */
	_rewinddir = telldir(dirp);
	return dirp;
}

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