sys/kern: adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

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.

17 files changed, 35 insertions, 1 deletions

diff --git a/sys/libkern/arm/aeabi_unwind.c b/sys/libkern/arm/aeabi_unwind.c
index 18cf1d0f917a..1b9bf0639d9a 100644
--- a/sys/libkern/arm/aeabi_unwind.c
+++ b/sys/libkern/arm/aeabi_unwind.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 2013 Andrew Turner
  * All rights reserved.
  *
diff --git a/sys/libkern/arm/ldivmod_helper.c b/sys/libkern/arm/ldivmod_helper.c
index f3c02b2478d5..65e2bf9d422d 100644
--- a/sys/libkern/arm/ldivmod_helper.c
+++ b/sys/libkern/arm/ldivmod_helper.c
@@ -1,4 +1,6 @@
 /*
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 2012 Andrew Turner
  * All rights reserved.
  *
diff --git a/sys/libkern/iconv.c b/sys/libkern/iconv.c
index b42c043e5e45..4c96c8d7a5fb 100644
--- a/sys/libkern/iconv.c
+++ b/sys/libkern/iconv.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2000-2001 Boris Popov
  * All rights reserved.
  *
diff --git a/sys/libkern/iconv_ucs.c b/sys/libkern/iconv_ucs.c
index 6d63f0b9e89d..2b970e5a2cd5 100644
--- a/sys/libkern/iconv_ucs.c
+++ b/sys/libkern/iconv_ucs.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2003, 2005 Ryuichiro Imura
  * All rights reserved.
  *
diff --git a/sys/libkern/iconv_xlat.c b/sys/libkern/iconv_xlat.c
index c5c2dfd4cd76..43bd5664305c 100644
--- a/sys/libkern/iconv_xlat.c
+++ b/sys/libkern/iconv_xlat.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2000-2001 Boris Popov
  * All rights reserved.
  *
diff --git a/sys/libkern/iconv_xlat16.c b/sys/libkern/iconv_xlat16.c
index c423413b0b68..fd16ff5c4574 100644
--- a/sys/libkern/iconv_xlat16.c
+++ b/sys/libkern/iconv_xlat16.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2003, 2005 Ryuichiro Imura
  * All rights reserved.
  *
diff --git a/sys/libkern/inet_aton.c b/sys/libkern/inet_aton.c
index a4625cb4fd1a..79a7b99b9555 100644
--- a/sys/libkern/inet_aton.c
+++ b/sys/libkern/inet_aton.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Charles Mott <cm@linktel.net>
  * All rights reserved.
  *
diff --git a/sys/libkern/memcchr.c b/sys/libkern/memcchr.c
index eebb23a4de24..526503ca5070 100644
--- a/sys/libkern/memcchr.c
+++ b/sys/libkern/memcchr.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2012 Ed Schouten <ed@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/sys/libkern/memmove.c b/sys/libkern/memmove.c
index 9cb26a25fb6c..2f1415fd3c2f 100644
--- a/sys/libkern/memmove.c
+++ b/sys/libkern/memmove.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 Roman Divacky <rdivacky@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/sys/libkern/memset.c b/sys/libkern/memset.c
index 895e67239429..011fbf34d0d4 100644
--- a/sys/libkern/memset.c
+++ b/sys/libkern/memset.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (C) 1992-2007 The FreeBSD Project. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/sys/libkern/strcspn.c b/sys/libkern/strcspn.c
index 4b78d47dc4ac..fce6d4b8b071 100644
--- a/sys/libkern/strcspn.c
+++ b/sys/libkern/strcspn.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
  * All rights reserved.
  *
diff --git a/sys/libkern/strdup.c b/sys/libkern/strdup.c
index 5922f569b20f..8169c3594c88 100644
--- a/sys/libkern/strdup.c
+++ b/sys/libkern/strdup.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2003 Networks Associates Technology, Inc.
  * All rights reserved.
  *
diff --git a/sys/libkern/strlcat.c b/sys/libkern/strlcat.c
index c532ffcdbe99..43ff3347cb8f 100644
--- a/sys/libkern/strlcat.c
+++ b/sys/libkern/strlcat.c
@@ -1,6 +1,8 @@
 /*	$OpenBSD: strlcat.c,v 1.2 1999/06/17 16:28:58 millert Exp $	*/
 
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1998 Todd C. Miller <Todd.Miller@courtesan.com>
  * All rights reserved.
  *
diff --git a/sys/libkern/strlen.c b/sys/libkern/strlen.c
index 6c9e3f1d0f62..095bcdb1ec63 100644
--- a/sys/libkern/strlen.c
+++ b/sys/libkern/strlen.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009, 2010 Xin LI <delphij@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/sys/libkern/strnlen.c b/sys/libkern/strnlen.c
index 805aee8483ff..d46a6c0746f6 100644
--- a/sys/libkern/strnlen.c
+++ b/sys/libkern/strnlen.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2009 David Schultz <das@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/sys/libkern/strspn.c b/sys/libkern/strspn.c
index 18327b7bd4b7..7ee9016e3345 100644
--- a/sys/libkern/strspn.c
+++ b/sys/libkern/strspn.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
  * All rights reserved.
  *
diff --git a/sys/libkern/strvalid.c b/sys/libkern/strvalid.c
index 3761b074348c..150e8016a224 100644
--- a/sys/libkern/strvalid.c
+++ b/sys/libkern/strvalid.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2002 Networks Associates Technology, Inc.
  * All rights reserved.
  *