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.

40 files changed, 94 insertions, 14 deletions

diff --git a/lib/libc/string/bcmp.c b/lib/libc/string/bcmp.c
index f1178a660b2b..96cd49039eee 100644
--- a/lib/libc/string/bcmp.c
+++ b/lib/libc/string/bcmp.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1987, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/bcopy.c b/lib/libc/string/bcopy.c
index c424de560f6c..141416d0afec 100644
--- a/lib/libc/string/bcopy.c
+++ b/lib/libc/string/bcopy.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/string/ffs.c b/lib/libc/string/ffs.c
index 42a94ef7383d..738ef90ce091 100644
--- a/lib/libc/string/ffs.c
+++ b/lib/libc/string/ffs.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/string/ffsl.c b/lib/libc/string/ffsl.c
index 3fd94521d623..dbd894b9655b 100644
--- a/lib/libc/string/ffsl.c
+++ b/lib/libc/string/ffsl.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/string/ffsll.c b/lib/libc/string/ffsll.c
index e19df91d1f03..91886de2f127 100644
--- a/lib/libc/string/ffsll.c
+++ b/lib/libc/string/ffsll.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/string/fls.c b/lib/libc/string/fls.c
index 7145b909f026..d9edc41f9599 100644
--- a/lib/libc/string/fls.c
+++ b/lib/libc/string/fls.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/string/flsl.c b/lib/libc/string/flsl.c
index 19485b2f787e..60370cf7d832 100644
--- a/lib/libc/string/flsl.c
+++ b/lib/libc/string/flsl.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/string/flsll.c b/lib/libc/string/flsll.c
index b12f12f2d0d7..275aaa0e2e15 100644
--- a/lib/libc/string/flsll.c
+++ b/lib/libc/string/flsll.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/string/memccpy.c b/lib/libc/string/memccpy.c
index 6102a5bdedaf..e4c9d0e17edd 100644
--- a/lib/libc/string/memccpy.c
+++ b/lib/libc/string/memccpy.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/string/memchr.c b/lib/libc/string/memchr.c
index 8020333dec3b..0dd9edecb704 100644
--- a/lib/libc/string/memchr.c
+++ b/lib/libc/string/memchr.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/string/memcmp.c b/lib/libc/string/memcmp.c
index d2d0f27d35ef..c8d5d92985e2 100644
--- a/lib/libc/string/memcmp.c
+++ b/lib/libc/string/memcmp.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/string/memset.c b/lib/libc/string/memset.c
index ad0d513933fe..7d9909a76083 100644
--- a/lib/libc/string/memset.c
+++ b/lib/libc/string/memset.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/string/stpcpy.c b/lib/libc/string/stpcpy.c
index beb115948d8a..f31cce131777 100644
--- a/lib/libc/string/stpcpy.c
+++ b/lib/libc/string/stpcpy.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1999
  *	David E. O'Brien
  * Copyright (c) 1988, 1993
diff --git a/lib/libc/string/strcasecmp.c b/lib/libc/string/strcasecmp.c
index c72a660508c4..60b5bb4f0c4c 100644
--- a/lib/libc/string/strcasecmp.c
+++ b/lib/libc/string/strcasecmp.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1987, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strcasestr.c b/lib/libc/string/strcasestr.c
index cca16dc7bb63..b70c2195a94e 100644
--- a/lib/libc/string/strcasestr.c
+++ b/lib/libc/string/strcasestr.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/string/strcat.c b/lib/libc/string/strcat.c
index 07a3c08c1a2f..adaad598ec22 100644
--- a/lib/libc/string/strcat.c
+++ b/lib/libc/string/strcat.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strchr.c b/lib/libc/string/strchr.c
index ab83b3995a44..61244da4519c 100644
--- a/lib/libc/string/strchr.c
+++ b/lib/libc/string/strchr.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/string/strcmp.c b/lib/libc/string/strcmp.c
index 9daf624acce0..63cb4468415b 100644
--- a/lib/libc/string/strcmp.c
+++ b/lib/libc/string/strcmp.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/string/strcpy.c b/lib/libc/string/strcpy.c
index 8a48d0d0d732..3eb0aa81eff5 100644
--- a/lib/libc/string/strcpy.c
+++ b/lib/libc/string/strcpy.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strdup.c b/lib/libc/string/strdup.c
index 8e90aa05fcb9..45ed95c2ea9d 100644
--- a/lib/libc/string/strdup.c
+++ b/lib/libc/string/strdup.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strerror.c b/lib/libc/string/strerror.c
index 1d7a385bd9ea..c5ac55ed3bc1 100644
--- a/lib/libc/string/strerror.c
+++ b/lib/libc/string/strerror.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strmode.c b/lib/libc/string/strmode.c
index a73dd0ede401..50016be21ea1 100644
--- a/lib/libc/string/strmode.c
+++ b/lib/libc/string/strmode.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/string/strncat.c b/lib/libc/string/strncat.c
index 6a0e553daa3f..116fc53f92f4 100644
--- a/lib/libc/string/strncat.c
+++ b/lib/libc/string/strncat.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/string/strncmp.c b/lib/libc/string/strncmp.c
index 4967a9483e64..c68fe005fcbc 100644
--- a/lib/libc/string/strncmp.c
+++ b/lib/libc/string/strncmp.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strncpy.c b/lib/libc/string/strncpy.c
index 39074035084c..3c02ccae41d8 100644
--- a/lib/libc/string/strncpy.c
+++ b/lib/libc/string/strncpy.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/string/strnstr.c b/lib/libc/string/strnstr.c
index 4de757d5996f..756399fea902 100644
--- a/lib/libc/string/strnstr.c
+++ b/lib/libc/string/strnstr.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * Copyright (c) 1990, 1993
  *	The Regents of the University of California.  All rights reserved.
diff --git a/lib/libc/string/strpbrk.c b/lib/libc/string/strpbrk.c
index 565ef82f11d3..964379e19074 100644
--- a/lib/libc/string/strpbrk.c
+++ b/lib/libc/string/strpbrk.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1985, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strrchr.c b/lib/libc/string/strrchr.c
index f84ffb78c438..6afb8c1a497f 100644
--- a/lib/libc/string/strrchr.c
+++ b/lib/libc/string/strrchr.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strsep.c b/lib/libc/string/strsep.c
index 73c61af8115f..5de452109df7 100644
--- a/lib/libc/string/strsep.c
+++ b/lib/libc/string/strsep.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/string/strsignal.c b/lib/libc/string/strsignal.c
index 7c461a3dbb80..5f3292d10255 100644
--- a/lib/libc/string/strsignal.c
+++ b/lib/libc/string/strsignal.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/strstr.c b/lib/libc/string/strstr.c
index 8ed58b81a875..890a4aba98f5 100644
--- a/lib/libc/string/strstr.c
+++ b/lib/libc/string/strstr.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2005-2014 Rich Felker, et al.
  *
  * Permission is hereby granted, free of charge, to any person obtaining
diff --git a/lib/libc/string/strtok.c b/lib/libc/string/strtok.c
index 063a554339a6..46e40bfa4a61 100644
--- a/lib/libc/string/strtok.c
+++ b/lib/libc/string/strtok.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
  *
  * strtok_r, from Berkeley strtok
diff --git a/lib/libc/string/swab.c b/lib/libc/string/swab.c
index 84633094be3b..1a30ce813784 100644
--- a/lib/libc/string/swab.c
+++ b/lib/libc/string/swab.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1988, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/wcpcpy.c b/lib/libc/string/wcpcpy.c
index df63d72a0463..41b7c5178269 100644
--- a/lib/libc/string/wcpcpy.c
+++ b/lib/libc/string/wcpcpy.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1999
  *	David E. O'Brien
  * Copyright (c) 1988, 1993
diff --git a/lib/libc/string/wcscmp.c b/lib/libc/string/wcscmp.c
index c2abe4c797f7..7205238d5637 100644
--- a/lib/libc/string/wcscmp.c
+++ b/lib/libc/string/wcscmp.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/string/wcsncmp.c b/lib/libc/string/wcsncmp.c
index 8236d969feef..55c88f60e6fa 100644
--- a/lib/libc/string/wcsncmp.c
+++ b/lib/libc/string/wcsncmp.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/string/wcsncpy.c b/lib/libc/string/wcsncpy.c
index 215e9a115156..f86e40fe9536 100644
--- a/lib/libc/string/wcsncpy.c
+++ b/lib/libc/string/wcsncpy.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/string/wcsstr.c b/lib/libc/string/wcsstr.c
index ce598a698969..74921fecf047 100644
--- a/lib/libc/string/wcsstr.c
+++ b/lib/libc/string/wcsstr.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/string/wcstok.c b/lib/libc/string/wcstok.c
index 441fbd444854..b4bdc869a2e1 100644
--- a/lib/libc/string/wcstok.c
+++ b/lib/libc/string/wcstok.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1998 Softweyr LLC.  All rights reserved.
  *
  * strtok_r, from Berkeley strtok
diff --git a/lib/libc/string/wcswidth.c b/lib/libc/string/wcswidth.c
index bac979b5b9f0..3a8805f1b754 100644
--- a/lib/libc/string/wcswidth.c
+++ b/lib/libc/string/wcswidth.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1989, 1993
  *	The Regents of the University of California.  All rights reserved.
  * (c) UNIX System Laboratories, Inc.