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Don't stop traversing a directory hierarchy if we reach SHRT_MAX,
just stop updating fts_level so we don't overflow it.  This allows
rm, find, etc to operate on very deep hierarchies.  Consumers of
fts(3) do need to be aware that the actual level may be larger
than fts_level.  During the next libc major bump we will make
fts_level an int instead of a short.  OK deraadt@

/*	$OpenBSD: fts.h,v 1.12 2009/08/27 16:19:27 millert Exp $	*/
/*	$NetBSD: fts.h,v 1.5 1994/12/28 01:41:50 mycroft Exp $	*/

/*
 * Copyright (c) 1989, 1993
 *	The 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. 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.
 *
 *	@(#)fts.h	8.3 (Berkeley) 8/14/94
 */

#ifndef	_FTS_H_
#define	_FTS_H_

typedef struct {
	struct _ftsent *fts_cur;	/* current node */
	struct _ftsent *fts_child;	/* linked list of children */
	struct _ftsent **fts_array;	/* sort array */
	dev_t fts_dev;			/* starting device # */
	char *fts_path;			/* path for this descent */
	int fts_rfd;			/* fd for root */
	size_t fts_pathlen;		/* sizeof(path) */
	int fts_nitems;			/* elements in the sort array */
	int (*fts_compar)();		/* compare function */

#define	FTS_COMFOLLOW	0x0001		/* follow command line symlinks */
#define	FTS_LOGICAL	0x0002		/* logical walk */
#define	FTS_NOCHDIR	0x0004		/* don't change directories */
#define	FTS_NOSTAT	0x0008		/* don't get stat info */
#define	FTS_PHYSICAL	0x0010		/* physical walk */
#define	FTS_SEEDOT	0x0020		/* return dot and dot-dot */
#define	FTS_XDEV	0x0040		/* don't cross devices */
#define	FTS_OPTIONMASK	0x00ff		/* valid user option mask */

#define	FTS_NAMEONLY	0x1000		/* (private) child names only */
#define	FTS_STOP	0x2000		/* (private) unrecoverable error */
	int fts_options;		/* fts_open options, global flags */
} FTS;

typedef struct _ftsent {
	struct _ftsent *fts_cycle;	/* cycle node */
	struct _ftsent *fts_parent;	/* parent directory */
	struct _ftsent *fts_link;	/* next file in directory */
	long fts_number;	        /* local numeric value */
	void *fts_pointer;	        /* local address value */
	char *fts_accpath;		/* access path */
	char *fts_path;			/* root path */
	int fts_errno;			/* errno for this node */
	int fts_symfd;			/* fd for symlink */
	size_t fts_pathlen;		/* strlen(fts_path) */
	size_t fts_namelen;		/* strlen(fts_name) */

	ino_t fts_ino;			/* inode */
	dev_t fts_dev;			/* device */
	nlink_t fts_nlink;		/* link count */

#define	FTS_ROOTPARENTLEVEL	-1
#define	FTS_ROOTLEVEL		 0
#define	FTS_MAXLEVEL		 0x7fff
	short fts_level;		/* depth (-1 to N) */

#define	FTS_D		 1		/* preorder directory */
#define	FTS_DC		 2		/* directory that causes cycles */
#define	FTS_DEFAULT	 3		/* none of the above */
#define	FTS_DNR		 4		/* unreadable directory */
#define	FTS_DOT		 5		/* dot or dot-dot */
#define	FTS_DP		 6		/* postorder directory */
#define	FTS_ERR		 7		/* error; errno is set */
#define	FTS_F		 8		/* regular file */
#define	FTS_INIT	 9		/* initialized only */
#define	FTS_NS		10		/* stat(2) failed */
#define	FTS_NSOK	11		/* no stat(2) requested */
#define	FTS_SL		12		/* symbolic link */
#define	FTS_SLNONE	13		/* symbolic link without target */
	unsigned short fts_info;	/* user flags for FTSENT structure */

#define	FTS_DONTCHDIR	 0x01		/* don't chdir .. to the parent */
#define	FTS_SYMFOLLOW	 0x02		/* followed a symlink to get here */
	unsigned short fts_flags;	/* private flags for FTSENT structure */

#define	FTS_AGAIN	 1		/* read node again */
#define	FTS_FOLLOW	 2		/* follow symbolic link */
#define	FTS_NOINSTR	 3		/* no instructions */
#define	FTS_SKIP	 4		/* discard node */
	unsigned short fts_instr;	/* fts_set() instructions */

	struct stat *fts_statp;		/* stat(2) information */
	char fts_name[1];		/* file name */
} FTSENT;

#include <sys/cdefs.h>

__BEGIN_DECLS
FTSENT	*fts_children(FTS *, int);
int	 fts_close(FTS *);
FTS	*fts_open(char * const *, int,
	    int (*)(const FTSENT **, const FTSENT **));
FTSENT	*fts_read(FTS *);
int	 fts_set(FTS *, FTSENT *, int);
__END_DECLS

#endif /* !_FTS_H_ */