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+/****************************************************************************
+ * bfs *
+ * Copyright (C) 2019-2020 Tavian Barnes <tavianator@tavianator.com> *
+ * *
+ * Permission to use, copy, modify, and/or distribute this software for any *
+ * purpose with or without fee is hereby granted. *
+ * *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES *
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF *
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR *
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES *
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN *
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF *
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. *
+ ****************************************************************************/
+
+/**
+ * A facade over (file)system features that are (un)implemented differently
+ * between platforms.
+ */
+
+#ifndef BFS_FSADE_H
+#define BFS_FSADE_H
+
+#include "util.h"
+#include <stdbool.h>
+
+#define BFS_CAN_CHECK_ACL BFS_HAS_SYS_ACL
+
+#if !defined(BFS_CAN_CHECK_CAPABILITIES) && BFS_HAS_SYS_CAPABILITY && !__FreeBSD__
+# include <sys/capability.h>
+# ifdef CAP_CHOWN
+# define BFS_CAN_CHECK_CAPABILITIES true
+# endif
+#endif
+
+#define BFS_CAN_CHECK_XATTRS (BFS_HAS_SYS_EXTATTR || BFS_HAS_SYS_XATTR)
+
+struct BFTW;
+
+/**
+ * Check if a file has a non-trivial Access Control List.
+ *
+ * @param ftwbuf
+ * The file to check.
+ * @return
+ * 1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_acl(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has a non-trivial capability set.
+ *
+ * @param ftwbuf
+ * The file to check.
+ * @return
+ * 1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_capabilities(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has any extended attributes set.
+ *
+ * @param ftwbuf
+ * The file to check.
+ * @return
+ * 1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_xattrs(const struct BFTW *ftwbuf);
+
+/**
+ * Check if a file has an extended attribute with the given name.
+ *
+ * @param ftwbuf
+ * The file to check.
+ * @param name
+ * The name of the xattr to check.
+ * @return
+ * 1 if it does, 0 if it doesn't, or -1 if an error occurred.
+ */
+int bfs_check_xattr_named(const struct BFTW *ftwbuf, const char *name);
+
+#endif // BFS_FSADE_H