spdx: initial adoption of licensing ID tags.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Initially, only tag files that use BSD 4-Clause "Original" license.

RelNotes:	yes
Differential Revision:	https://reviews.freebsd.org/D13133

13 files changed, 39 insertions, 12 deletions

diff --git a/sbin/bsdlabel/bsdlabel.c b/sbin/bsdlabel/bsdlabel.c
index 83df67ae0fe3..f013cde3ef09 100644
--- a/sbin/bsdlabel/bsdlabel.c
+++ b/sbin/bsdlabel/bsdlabel.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1994, 1995 Gordon W. Ross
  * Copyright (c) 1994 Theo de Raadt
  * All rights reserved.
diff --git a/sbin/etherswitchcfg/ifmedia.c b/sbin/etherswitchcfg/ifmedia.c
index b9bd3b9c56ff..fd2a7fb86db2 100644
--- a/sbin/etherswitchcfg/ifmedia.c
+++ b/sbin/etherswitchcfg/ifmedia.c
@@ -1,7 +1,9 @@
 /*	$NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $	*/
 /* $FreeBSD$ */
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1997 Jason R. Thorpe.
  * All rights reserved.
  *
diff --git a/sbin/ffsinfo/ffsinfo.c b/sbin/ffsinfo/ffsinfo.c
index 1c082aba8fb0..5e08d35e5d91 100644
--- a/sbin/ffsinfo/ffsinfo.c
+++ b/sbin/ffsinfo/ffsinfo.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
  * Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
  * All rights reserved.
diff --git a/sbin/growfs/debug.c b/sbin/growfs/debug.c
index 9a320ecd89ee..e0dfc997fcf6 100644
--- a/sbin/growfs/debug.c
+++ b/sbin/growfs/debug.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
  * Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
  * All rights reserved.
diff --git a/sbin/growfs/debug.h b/sbin/growfs/debug.h
index 3cad9d97874c..068e89c3441f 100644
--- a/sbin/growfs/debug.h
+++ b/sbin/growfs/debug.h
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
  * Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
  * All rights reserved.
diff --git a/sbin/growfs/growfs.c b/sbin/growfs/growfs.c
index 2e8271b39d5d..7670317caae7 100644
--- a/sbin/growfs/growfs.c
+++ b/sbin/growfs/growfs.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1980, 1989, 1993 The Regents of the University of California.
  * Copyright (c) 2000 Christoph Herrmann, Thomas-Henning von Kamptz
  * Copyright (c) 2012 The FreeBSD Foundation
diff --git a/sbin/gvinum/gvinum.h b/sbin/gvinum/gvinum.h
index 8b72eea7834f..e9c112a5e936 100644
--- a/sbin/gvinum/gvinum.h
+++ b/sbin/gvinum/gvinum.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1997, 1998
  *	Nan Yang Computer Services Limited.  All rights reserved.
  *
diff --git a/sbin/ifconfig/ifmedia.c b/sbin/ifconfig/ifmedia.c
index abcad7f368c7..0c586331bbec 100644
--- a/sbin/ifconfig/ifmedia.c
+++ b/sbin/ifconfig/ifmedia.c
@@ -1,7 +1,9 @@
 /*	$NetBSD: ifconfig.c,v 1.34 1997/04/21 01:17:58 lukem Exp $	*/
 /* $FreeBSD$ */
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1997 Jason R. Thorpe.
  * All rights reserved.
  *
diff --git a/sbin/ifconfig/ifvlan.c b/sbin/ifconfig/ifvlan.c
index 3b37160c3c85..a29c50f11efa 100644
--- a/sbin/ifconfig/ifvlan.c
+++ b/sbin/ifconfig/ifvlan.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1999 Bill Paul <wpaul@ctr.columbia.edu>
  * Copyright (c) 2012 ADARA Networks, Inc.
  * All rights reserved.
diff --git a/sbin/rcorder/ealloc.c b/sbin/rcorder/ealloc.c
index 997119315531..eae8bb67d69a 100644
--- a/sbin/rcorder/ealloc.c
+++ b/sbin/rcorder/ealloc.c
@@ -1,7 +1,9 @@
 /*	$FreeBSD$	*/
 /*	$NetBSD: ealloc.c,v 1.1.1.1 1999/11/19 04:30:56 mrg Exp $	*/
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1988, 1989, 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  * Copyright (c) 1989 by Berkeley Softworks
diff --git a/sbin/rcorder/hash.c b/sbin/rcorder/hash.c
index 34b95ce82f7a..3dcb77054960 100644
--- a/sbin/rcorder/hash.c
+++ b/sbin/rcorder/hash.c
@@ -1,7 +1,9 @@
 /*	$FreeBSD$	*/
 /*	$NetBSD: hash.c,v 1.1.1.1 1999/11/19 04:30:56 mrg Exp $	*/
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
  * Copyright (c) 1988, 1989 by Adam de Boor
  * Copyright (c) 1989 by Berkeley Softworks
diff --git a/sbin/rcorder/hash.h b/sbin/rcorder/hash.h
index fd2f9783377b..d190633861a0 100644
--- a/sbin/rcorder/hash.h
+++ b/sbin/rcorder/hash.h
@@ -1,7 +1,9 @@
 /*	$FreeBSD$	*/
 /*	$NetBSD: hash.h,v 1.1.1.1 1999/11/19 04:30:56 mrg Exp $	*/
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1988, 1989, 1990 The Regents of the University of California.
  * Copyright (c) 1988, 1989 by Adam de Boor
  * Copyright (c) 1989 by Berkeley Softworks
diff --git a/sbin/rcorder/sprite.h b/sbin/rcorder/sprite.h
index 5e5d7f3640f7..e311ee6e0f66 100644
--- a/sbin/rcorder/sprite.h
+++ b/sbin/rcorder/sprite.h
@@ -1,6 +1,8 @@
 /*	$NetBSD: sprite.h,v 1.1 1999/11/23 05:28:22 mrg Exp $	*/
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-4-Clause
+ *
  * Copyright (c) 1988, 1989, 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  * Copyright (c) 1989 by Berkeley Softworks
@@ -38,6 +40,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)sprite.h	8.1 (Berkeley) 6/6/93
+ * $FreeBSD$
  */
 
 /*