Make path length variables size_t. This fixes the problem where

things like rm can't remove files with ridiculously long path names
that were created by some script kiddie trying in vain to exploit
something.  Previously, the length was effectively constrained to
USHRT_MAX due to one of the internal structs.  Also, nuke FTS_CHDIRROOT
since it never worked correctly and hasn't been documented for a
long time.

src/include/fts.h

@@ -1,4 +1,4 @@
-/*	$OpenBSD: fts.h,v 1.5 1999/10/03 20:39:52 millert Exp $	*/
+/*	$OpenBSD: fts.h,v 1.6 2001/05/15 21:14:37 millert Exp $	*/
 /*	$NetBSD: fts.h,v 1.5 1994/12/28 01:41:50 mycroft Exp $	*/
 
 /*
@@ -46,7 +46,7 @@ typedef struct {
 	dev_t fts_dev;			/* starting device # */
 	char *fts_path;			/* path for this descent */
 	int fts_rfd;			/* fd for root */
-	int fts_pathlen;		/* sizeof(path) */
+	size_t fts_pathlen;		/* sizeof(path) */
 	int fts_nitems;			/* elements in the sort array */
 	int (*fts_compar)();		/* compare function */
 
@@ -58,8 +58,7 @@ typedef struct {
 #define	FTS_SEEDOT	0x0020		/* return dot and dot-dot */
 #define	FTS_XDEV	0x0040		/* don't cross devices */
 #define	FTS_WHITEOUT	0x0080		/* return whiteout information */
-#define	FTS_CHDIRROOT	0x0100		/* chdir to root of tree not orig cwd */
-#define	FTS_OPTIONMASK	0x0fff		/* valid user option mask */
+#define	FTS_OPTIONMASK	0x00ff		/* valid user option mask */
 
 #define	FTS_NAMEONLY	0x1000		/* (private) child names only */
 #define	FTS_STOP	0x2000		/* (private) unrecoverable error */
@@ -76,8 +75,8 @@ typedef struct _ftsent {
 	char *fts_path;			/* root path */
 	int fts_errno;			/* errno for this node */
 	int fts_symfd;			/* fd for symlink */
-	u_short fts_pathlen;		/* strlen(fts_path) */
-	u_short fts_namelen;		/* strlen(fts_name) */
+	size_t fts_pathlen;		/* strlen(fts_path) */
+	size_t fts_namelen;		/* strlen(fts_name) */
 
 	ino_t fts_ino;			/* inode */
 	dev_t fts_dev;			/* device */