SPDXify the code.

actions.c

@@ -1,3 +1,11 @@
+/*
+ * Actions for the duneon-running code.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
+ */
+
 #include <stdlib.h>
 #include <stdbool.h>
 #include <string.h>

adventure.yaml

@@ -112,6 +112,9 @@
 #       %s = an ASCII string
 #	%S = The letter 's' or nothing (if a previous %d value is exactly 1)
 #	%V = substitute program version string
+#
+# Copyright (c) 2017 by Eric S. Raymond
+# SPDX-License-Identifier: BSD-2-clause
 
 motions: !!omap
 - MOT_0:

cheat.c

@@ -3,6 +3,10 @@
  * not happen. It leverages chunks of advent, mostly initialize() and
  * savefile(), so we know we're always outputing save files that advent
  * can import.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
  */
 #include <getopt.h>
 #include <stdlib.h>

init.c

@@ -1,3 +1,11 @@
+/*
+ * Initialisation
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
+ */
+
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>
@@ -6,10 +14,6 @@
 
 #include "advent.h"
 
-/*
- * Initialisation
- */
-
 struct settings_t settings = {
     .logfp = NULL,
     .oldstyle = false,

main.c

@@ -11,6 +11,10 @@
  * ESR apologizes for the remaing gotos (now confined to one function
  * in this file - there used to be over 350 of them, *everywhere*).
  * Applying the Structured Program Theorem can be hard.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
  */
 
 #include <stdlib.h>

make_dungeon.py

@@ -6,6 +6,9 @@
 # The nontrivial part of this is the compilation of the YAML for
 # movement rules to the travel array that's actually used by
 # playermove().
+#
+# Copyright (c) 2017 by Eric S. Raymond
+# SPDX-License-Identifier: BSD-2-clause
 
 import sys, yaml
 

misc.c

@@ -1,3 +1,11 @@
+/*
+ * I/O and support riutines.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
+ */
+     
 #include <unistd.h>
 #include <stdlib.h>
 #include <stdio.h>

saveresume.c

@@ -1,3 +1,14 @@
+/*
+ * Saving and resuming.
+ *
+ * (ESR) This replaces  a bunch of particularly nasty FORTRAN-derived code;
+ * see the history.adoc file in the source distribution for discussion.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
+ */
+
 #include <stdlib.h>
 #include <string.h>
 #include <editline/readline.h>
@@ -7,11 +18,6 @@
 #include "advent.h"
 #include "dungeon.h"
 
-/*
- * (ESR) This replaces  a bunch of particularly nasty FORTRAN-derived code;
- * see the history.adoc file in the source distribution for discussion.
- */
-
 #define VRSION	28	/* bump on save format change */
 
 /*

score.c

@@ -1,11 +1,14 @@
+/*
+ * Scoring and wrap-up.
+ *
+ * Copyright (c) 1977, 2005 by Will Crowther and Don Woods
+ * Copyright (c) 2017 by Eric S. Raymond
+ * SPDX-License-Identifier: BSD-2-clause
+ */
 #include <stdlib.h>
 #include "advent.h"
 #include "dungeon.h"
 
-/*
- * scoring and wrap-up
- */
-
 static int mxscor;	/* ugh..the price for having score() not exit. */
 
 long score(enum termination mode)