General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

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.

10 files changed, 20 insertions, 0 deletions

diff --git a/lib/libc/db/hash/extern.h b/lib/libc/db/hash/extern.h
index 007612340f20..e938f9123914 100644
--- a/lib/libc/db/hash/extern.h
+++ b/lib/libc/db/hash/extern.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash.c b/lib/libc/db/hash/hash.c
index cc2e042182de..ebb8790b3f23 100644
--- a/lib/libc/db/hash/hash.c
+++ b/lib/libc/db/hash/hash.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash.h b/lib/libc/db/hash/hash.h
index 0cae9d16e3ce..5d4f8d5e8735 100644
--- a/lib/libc/db/hash/hash.h
+++ b/lib/libc/db/hash/hash.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash_bigkey.c b/lib/libc/db/hash/hash_bigkey.c
index 7889378fdb43..24596cf780ea 100644
--- a/lib/libc/db/hash/hash_bigkey.c
+++ b/lib/libc/db/hash/hash_bigkey.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash_buf.c b/lib/libc/db/hash/hash_buf.c
index 8fb67cda8a0e..63cc9eb4d9ad 100644
--- a/lib/libc/db/hash/hash_buf.c
+++ b/lib/libc/db/hash/hash_buf.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash_func.c b/lib/libc/db/hash/hash_func.c
index 0ebb9ecbdd94..988e0eed2a30 100644
--- a/lib/libc/db/hash/hash_func.c
+++ b/lib/libc/db/hash/hash_func.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash_log2.c b/lib/libc/db/hash/hash_log2.c
index edc27e92e1fb..d89351cb415f 100644
--- a/lib/libc/db/hash/hash_log2.c
+++ b/lib/libc/db/hash/hash_log2.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/hash_page.c b/lib/libc/db/hash/hash_page.c
index 8f1799805d8e..fba854b51f33 100644
--- a/lib/libc/db/hash/hash_page.c
+++ b/lib/libc/db/hash/hash_page.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/ndbm.c b/lib/libc/db/hash/ndbm.c
index d3cae8bbccf0..ace1fb8b9fa7 100644
--- a/lib/libc/db/hash/ndbm.c
+++ b/lib/libc/db/hash/ndbm.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/db/hash/page.h b/lib/libc/db/hash/page.h
index 49bcad453236..17070e1ff584 100644
--- a/lib/libc/db/hash/page.h
+++ b/lib/libc/db/hash/page.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1990, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *