30 files changed, 72 insertions, 12 deletions

diff --git a/lib/libc/stdlib/abort.c b/lib/libc/stdlib/abort.c
index 2335c400da776..72c93a115ec0a 100644
--- a/lib/libc/stdlib/abort.c
+++ b/lib/libc/stdlib/abort.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/stdlib/abs.c b/lib/libc/stdlib/abs.c
index 367b114f745de..0e4c94c682867 100644
--- a/lib/libc/stdlib/abs.c
+++ b/lib/libc/stdlib/abs.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/stdlib/atexit.c b/lib/libc/stdlib/atexit.c
index eda57032f670c..bc9ad3ebd7bfb 100644
--- a/lib/libc/stdlib/atexit.c
+++ b/lib/libc/stdlib/atexit.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/stdlib/atexit.h b/lib/libc/stdlib/atexit.h
index 29610676edaaf..fdf2fc1583807 100644
--- a/lib/libc/stdlib/atexit.h
+++ b/lib/libc/stdlib/atexit.h
@@ -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/stdlib/atof.c b/lib/libc/stdlib/atof.c
index 0458eb968331e..c7e0676188eaa 100644
--- a/lib/libc/stdlib/atof.c
+++ b/lib/libc/stdlib/atof.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/stdlib/atoi.c b/lib/libc/stdlib/atoi.c
index 9f92fcdad4be8..c268a8c1569d1 100644
--- a/lib/libc/stdlib/atoi.c
+++ b/lib/libc/stdlib/atoi.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/stdlib/atol.c b/lib/libc/stdlib/atol.c
index bd8ef07c544d3..35e83fbf6181a 100644
--- a/lib/libc/stdlib/atol.c
+++ b/lib/libc/stdlib/atol.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/stdlib/atoll.c b/lib/libc/stdlib/atoll.c
index 093fde5d9f919..bfbdb976501a3 100644
--- a/lib/libc/stdlib/atoll.c
+++ b/lib/libc/stdlib/atoll.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/stdlib/bsearch.c b/lib/libc/stdlib/bsearch.c
index 8303f971b5623..432bb918f3536 100644
--- a/lib/libc/stdlib/bsearch.c
+++ b/lib/libc/stdlib/bsearch.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/stdlib/div.c b/lib/libc/stdlib/div.c
index 0bafbe6070377..b7efb1dfc5954 100644
--- a/lib/libc/stdlib/div.c
+++ b/lib/libc/stdlib/div.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/stdlib/exit.c b/lib/libc/stdlib/exit.c
index 521d05a554b11..efd7f55f68c60 100644
--- a/lib/libc/stdlib/exit.c
+++ b/lib/libc/stdlib/exit.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/stdlib/getopt.c b/lib/libc/stdlib/getopt.c
index 3929b321dca90..b6bdf8a1eeaf7 100644
--- a/lib/libc/stdlib/getopt.c
+++ b/lib/libc/stdlib/getopt.c
@@ -1,6 +1,8 @@
 /*	$NetBSD: getopt.c,v 1.29 2014/06/05 22:00:22 christos Exp $	*/
 
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1987, 1993, 1994
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/getsubopt.c b/lib/libc/stdlib/getsubopt.c
index d2db9916d8d81..7ad9ae9944440 100644
--- a/lib/libc/stdlib/getsubopt.c
+++ b/lib/libc/stdlib/getsubopt.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/stdlib/heapsort.c b/lib/libc/stdlib/heapsort.c
index db0a953846556..c39f67533b9af 100644
--- a/lib/libc/stdlib/heapsort.c
+++ b/lib/libc/stdlib/heapsort.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1991, 1993
  *	The Regents of the University of California.  All rights reserved.
  * Copyright (c) 2014 David T. Chisnall
diff --git a/lib/libc/stdlib/labs.c b/lib/libc/stdlib/labs.c
index ef068826c2f30..a770b2cf43570 100644
--- a/lib/libc/stdlib/labs.c
+++ b/lib/libc/stdlib/labs.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/stdlib/ldiv.c b/lib/libc/stdlib/ldiv.c
index 745c5667e6a4b..f55ad6de4faf7 100644
--- a/lib/libc/stdlib/ldiv.c
+++ b/lib/libc/stdlib/ldiv.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/stdlib/merge.c b/lib/libc/stdlib/merge.c
index 55b3a0c4fae1d..3a47e424e4dad 100644
--- a/lib/libc/stdlib/merge.c
+++ b/lib/libc/stdlib/merge.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/qsort.c b/lib/libc/stdlib/qsort.c
index 1ccc518d396f1..dab451f58a48b 100644
--- a/lib/libc/stdlib/qsort.c
+++ b/lib/libc/stdlib/qsort.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/radixsort.c b/lib/libc/stdlib/radixsort.c
index 205f7765a444f..4a0a764c81dad 100644
--- a/lib/libc/stdlib/radixsort.c
+++ b/lib/libc/stdlib/radixsort.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/stdlib/rand.c b/lib/libc/stdlib/rand.c
index 2e0456a9edc36..be2c3d4f058b6 100644
--- a/lib/libc/stdlib/rand.c
+++ b/lib/libc/stdlib/rand.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/stdlib/random.c b/lib/libc/stdlib/random.c
index 48b1205786988..5e8a1ceaf2546 100644
--- a/lib/libc/stdlib/random.c
+++ b/lib/libc/stdlib/random.c
@@ -1,4 +1,6 @@
-/*
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1983, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtoimax.c b/lib/libc/stdlib/strtoimax.c
index 72903e8df00e5..b264512321700 100644
--- a/lib/libc/stdlib/strtoimax.c
+++ b/lib/libc/stdlib/strtoimax.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtol.c b/lib/libc/stdlib/strtol.c
index e0c9978458e30..8b53b740e8240 100644
--- a/lib/libc/stdlib/strtol.c
+++ b/lib/libc/stdlib/strtol.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/stdlib/strtoll.c b/lib/libc/stdlib/strtoll.c
index 16a8196a3562d..c87aefb1cd220 100644
--- a/lib/libc/stdlib/strtoll.c
+++ b/lib/libc/stdlib/strtoll.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtoq.c b/lib/libc/stdlib/strtoq.c
index 7bc1c80a3a32c..b3fd56186206f 100644
--- a/lib/libc/stdlib/strtoq.c
+++ b/lib/libc/stdlib/strtoq.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtoul.c b/lib/libc/stdlib/strtoul.c
index ed58dd8ae6624..50ce1cbf07a86 100644
--- a/lib/libc/stdlib/strtoul.c
+++ b/lib/libc/stdlib/strtoul.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/stdlib/strtoull.c b/lib/libc/stdlib/strtoull.c
index dc40e0e989196..58a9b23b566d1 100644
--- a/lib/libc/stdlib/strtoull.c
+++ b/lib/libc/stdlib/strtoull.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtoumax.c b/lib/libc/stdlib/strtoumax.c
index 769967727ac5e..80937036de75d 100644
--- a/lib/libc/stdlib/strtoumax.c
+++ b/lib/libc/stdlib/strtoumax.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/strtouq.c b/lib/libc/stdlib/strtouq.c
index 9371680b97214..77a74995afbdf 100644
--- a/lib/libc/stdlib/strtouq.c
+++ b/lib/libc/stdlib/strtouq.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
  * Copyright (c) 1992, 1993
  *	The Regents of the University of California.  All rights reserved.
  *
diff --git a/lib/libc/stdlib/system.c b/lib/libc/stdlib/system.c
index 2b298e45a6d63..3431832567186 100644
--- a/lib/libc/stdlib/system.c
+++ b/lib/libc/stdlib/system.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.
  *