libc: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified 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.

11 files changed, 23 insertions, 1 deletions

diff --git a/lib/libc/stdlib/getenv.c b/lib/libc/stdlib/getenv.c
index e90eccd3d3d3..5d445e18d93b 100644
--- a/lib/libc/stdlib/getenv.c
+++ b/lib/libc/stdlib/getenv.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2007-2009 Sean C. Farley <scf@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/hcreate.c b/lib/libc/stdlib/hcreate.c
index 2d5d943a4d82..d2b7c1cd8cac 100644
--- a/lib/libc/stdlib/hcreate.c
+++ b/lib/libc/stdlib/hcreate.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2015 Nuxi, https://nuxi.nl/
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/lib/libc/stdlib/imaxabs.c b/lib/libc/stdlib/imaxabs.c
index 35e3dee79d36..7af863502ee5 100644
--- a/lib/libc/stdlib/imaxabs.c
+++ b/lib/libc/stdlib/imaxabs.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/imaxdiv.c b/lib/libc/stdlib/imaxdiv.c
index adcab0b14dbb..4d9f77546b9a 100644
--- a/lib/libc/stdlib/imaxdiv.c
+++ b/lib/libc/stdlib/imaxdiv.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/llabs.c b/lib/libc/stdlib/llabs.c
index 2bfbada80d93..6b405f0314d1 100644
--- a/lib/libc/stdlib/llabs.c
+++ b/lib/libc/stdlib/llabs.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/lldiv.c b/lib/libc/stdlib/lldiv.c
index 197b48f3f51e..47c13ee30e11 100644
--- a/lib/libc/stdlib/lldiv.c
+++ b/lib/libc/stdlib/lldiv.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Mike Barcroft <mike@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/ptsname.c b/lib/libc/stdlib/ptsname.c
index 3e4d4c096ef5..328528537ab5 100644
--- a/lib/libc/stdlib/ptsname.c
+++ b/lib/libc/stdlib/ptsname.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/quick_exit.c b/lib/libc/stdlib/quick_exit.c
index 4d81a35f5375..676dc287a511 100644
--- a/lib/libc/stdlib/quick_exit.c
+++ b/lib/libc/stdlib/quick_exit.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2011 David Chisnall
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/reallocf.c b/lib/libc/stdlib/reallocf.c
index a85b5a3c036b..470d55bd736c 100644
--- a/lib/libc/stdlib/reallocf.c
+++ b/lib/libc/stdlib/reallocf.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 1998, M. Warner Losh <imp@freebsd.org>
  * All rights reserved.
  *
diff --git a/lib/libc/stdlib/realpath.c b/lib/libc/stdlib/realpath.c
index d19f641cfdee..9b0ba94473cb 100644
--- a/lib/libc/stdlib/realpath.c
+++ b/lib/libc/stdlib/realpath.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 2003 Constantin S. Svintsoff <kostik@iclub.nsu.ru>
  *
  * Redistribution and use in source and binary forms, with or without
diff --git a/lib/libc/stdlib/strfmon.c b/lib/libc/stdlib/strfmon.c
index af038fe17caf..035b17136c3f 100644
--- a/lib/libc/stdlib/strfmon.c
+++ b/lib/libc/stdlib/strfmon.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2001 Alexey Zelkin <phantom@FreeBSD.org>
  * All rights reserved.
  *