Provide a fallback version of fts(3) for systems lacking it.

I chose the OpenBSD version because it apparently contains various
bugfixes that never made it into libnbcompat.  To reduce size and
complexity, i stripped out the features we don't need.

1 files changed, 106 insertions, 0 deletions

diff --git a/compat_fts.h b/compat_fts.h
new file mode 100644
index 00000000..ce7ee628
--- /dev/null
+++ b/compat_fts.h
@@ -0,0 +1,106 @@
+/*	$OpenBSD: fts.h,v 1.14 2012/12/05 23:19:57 deraadt Exp $	*/
+/*	$NetBSD: fts.h,v 1.7 2012/03/01 16:18:51 hans 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 */
+	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) */
+
+#define	FTS_NOCHDIR	0x0004		/* don't change directories */
+#define	FTS_PHYSICAL	0x0010		/* physical walk */
+#define	FTS_XDEV	0x0040		/* don't cross devices */
+#define	FTS_OPTIONMASK	0x00ff		/* valid user option mask */
+
+#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 */
+	char *fts_accpath;		/* access path */
+	char *fts_path;			/* root path */
+	int fts_errno;			/* errno for this node */
+	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		 0x7fffffff
+	int 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 */
+	unsigned short fts_info;	/* user flags for FTSENT structure */
+
+#define	FTS_DONTCHDIR	 0x01		/* don't chdir .. to the parent */
+	unsigned short fts_flags;	/* private flags for FTSENT structure */
+
+#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;
+
+__BEGIN_DECLS
+int	 fts_close(FTS *);
+FTS	*fts_open(char * const *, int, void *);
+FTSENT	*fts_read(FTS *);
+int	 fts_set(FTS *, FTSENT *, int);
+__END_DECLS
+
+#endif /* !_FTS_H_ */