Add use of `const' where appropriate to the games.

This merges in all such remaining changes from the Linux port of the
NetBSD games, except in hunt (where substantial changes from OpenBSD
need to be looked at).

Some such changes were previously covered in PRs bin/6041, bin/6146,
bin/6148, bin/6150, bin/6151, bin/6580, bin/6660, bin/7993, bin/7994,
bin/8039, bin/8057 and bin/8093.

8 files changed, 36 insertions, 35 deletions

diff --git a/robots/auto.c b/robots/auto.c
index 03842278..c0a15bf8 100644
--- a/robots/auto.c
+++ b/robots/auto.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: auto.c,v 1.3 1999/05/16 00:15:46 christos Exp $	*/
+/*	$NetBSD: auto.c,v 1.4 1999/09/08 21:17:56 jsm Exp $	*/
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
 static int distance __P((int, int, int, int));
 static int xinc __P((int));
 static int yinc __P((int));
-static char *find_moves __P((void));
+static const char *find_moves __P((void));
 static COORD *closest_robot __P((int *));
 static COORD *closest_heap __P((int *));
 static char move_towards __P((int, int));
@@ -137,13 +137,14 @@ yinc(dir)
 /* find_moves():
  *	Find possible moves
  */
-static char *
+static const char *
 find_moves()
 {
         int x, y;
         COORD test;
-        char *m, *a;
-        static char moves[] = ".hjklyubn";
+        const char *m;
+        char *a;
+        static const char moves[] = ".hjklyubn";
         static char ans[sizeof moves];
         a = ans;
 
@@ -167,10 +168,9 @@ find_moves()
         }
         *a = 0;
         if(ans[0])
-                a = ans;
+                return ans;
         else
-                a = "t";
-        return a;
+                return "t";
 }
 
 /* closest_robot():
diff --git a/robots/extern.c b/robots/extern.c
index 80c2e909..395c021b 100644
--- a/robots/extern.c
+++ b/robots/extern.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: extern.c,v 1.5 1999/05/15 23:56:35 christos Exp $	*/
+/*	$NetBSD: extern.c,v 1.6 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)extern.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: extern.c,v 1.5 1999/05/15 23:56:35 christos Exp $");
+__RCSID("$NetBSD: extern.c,v 1.6 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -63,8 +63,8 @@ bool	Was_bonus = FALSE;	/* Was a bonus last level */
 
 char	Cnt_move;		/* Command which has preceded the count */
 char	Field[Y_FIELDSIZE][X_FIELDSIZE];	/* the playing field itslef */
-char	*Next_move;		/* Next move to be used in the pattern */
-char	*Move_list = "YHBJNLUK";/* List of moves in the pattern */
+const char	*Next_move;	/* Next move to be used in the pattern */
+const char	*Move_list = "YHBJNLUK";/* List of moves in the pattern */
 char	Run_ch;			/* Character for the direction we are running */
 
 int	Count = 0;		/* Command count */
diff --git a/robots/init_field.c b/robots/init_field.c
index a5fd9e25..57200a44 100644
--- a/robots/init_field.c
+++ b/robots/init_field.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: init_field.c,v 1.5 1997/10/12 14:09:57 lukem Exp $	*/
+/*	$NetBSD: init_field.c,v 1.6 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)init_field.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: init_field.c,v 1.5 1997/10/12 14:09:57 lukem Exp $");
+__RCSID("$NetBSD: init_field.c,v 1.6 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -54,7 +54,7 @@ init_field()
 {
 	int		i;
 	static bool	first = TRUE;
-	static char	*desc[] = {
+	static const char	*const desc[] = {
 				"Directions:",
 				"",
 				"y k u",
diff --git a/robots/main.c b/robots/main.c
index b1c2ff36..ce7f8cf5 100644
--- a/robots/main.c
+++ b/robots/main.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: main.c,v 1.8 1999/05/15 23:56:36 christos Exp $	*/
+/*	$NetBSD: main.c,v 1.9 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -43,7 +43,7 @@ __COPYRIGHT("@(#) Copyright (c) 1980, 1993\n\
 #if 0
 static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: main.c,v 1.8 1999/05/15 23:56:36 christos Exp $");
+__RCSID("$NetBSD: main.c,v 1.9 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -56,10 +56,10 @@ main(ac, av)
 	int	ac;
 	char	**av;
 {
-	char	*sp;
+	const char	*sp;
 	bool	bad_arg;
 	bool	show_only;
-	extern char	*Scorefile;
+	extern const char	*Scorefile;
 	extern int	Max_per_uid;
 
 	show_only = FALSE;
diff --git a/robots/move.c b/robots/move.c
index db08c84c..a74c6c76 100644
--- a/robots/move.c
+++ b/robots/move.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: move.c,v 1.8 1999/05/15 23:56:36 christos Exp $	*/
+/*	$NetBSD: move.c,v 1.9 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)move.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: move.c,v 1.8 1999/05/15 23:56:36 christos Exp $");
+__RCSID("$NetBSD: move.c,v 1.9 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -274,7 +274,7 @@ do_move(dy, dx)
  */
 bool
 eaten(pos)
-	COORD	*pos;
+	const COORD	*pos;
 {
 	int	x, y;
 
diff --git a/robots/query.c b/robots/query.c
index e0ca5823..b89535e2 100644
--- a/robots/query.c
+++ b/robots/query.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: query.c,v 1.4 1997/10/12 14:10:01 lukem Exp $	*/
+/*	$NetBSD: query.c,v 1.5 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -38,7 +38,7 @@
 #if 0
 static char sccsid[] = "@(#)query.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: query.c,v 1.4 1997/10/12 14:10:01 lukem Exp $");
+__RCSID("$NetBSD: query.c,v 1.5 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
@@ -50,7 +50,7 @@ __RCSID("$NetBSD: query.c,v 1.4 1997/10/12 14:10:01 lukem Exp $");
  */
 int
 query(prompt)
-	char	*prompt;
+	const char	*prompt;
 {
 	int	c, retval;
 	int	y, x;
diff --git a/robots/robots.h b/robots/robots.h
index a93e07b4..3fcf5c1c 100644
--- a/robots/robots.h
+++ b/robots/robots.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: robots.h,v 1.10 1999/05/16 00:03:35 christos Exp $	*/
+/*	$NetBSD: robots.h,v 1.11 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -105,8 +105,8 @@ extern bool	Dead, Full_clear, Jump, Newscore, Real_time, Running,
 extern bool	Pattern_roll, Stand_still;
 #endif
 
-extern char	Cnt_move, Field[Y_FIELDSIZE][X_FIELDSIZE], *Next_move,
-		*Move_list, Run_ch;
+extern char	Cnt_move, Field[Y_FIELDSIZE][X_FIELDSIZE], Run_ch;
+extern const char *Next_move, *Move_list;
 
 extern int	Count, Level, Num_robots, Num_scrap, Num_scores, Score,
 		Start_level, Wait_bonus, Num_games;
@@ -123,7 +123,7 @@ void	add_score __P((int));
 bool	another __P((void));
 int	cmp_sc __P((const void *, const void *));
 bool	do_move __P((int, int));
-bool	eaten __P((COORD *));
+bool	eaten __P((const COORD *));
 void	flush_in __P((void));
 void	get_move __P((void));
 void	init_field __P((void));
@@ -132,7 +132,7 @@ void	make_level __P((void));
 void	move_robots __P((int));
 bool	must_telep __P((void));
 void	play_level __P((void));
-int	query __P((char *));
+int	query __P((const char *));
 void	quit __P((int)) __attribute__((__noreturn__));
 void	reset_count __P((void));
 int	rnd __P((int));
diff --git a/robots/score.c b/robots/score.c
index aacb07ec..c22a7463 100644
--- a/robots/score.c
+++ b/robots/score.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: score.c,v 1.7 1999/05/16 00:03:35 christos Exp $	*/
+/*	$NetBSD: score.c,v 1.8 1999/09/08 21:17:57 jsm Exp $	*/
 
 /*
  * Copyright (c) 1980, 1993
@@ -38,14 +38,14 @@
 #if 0
 static char sccsid[] = "@(#)score.c	8.1 (Berkeley) 5/31/93";
 #else
-__RCSID("$NetBSD: score.c,v 1.7 1999/05/16 00:03:35 christos Exp $");
+__RCSID("$NetBSD: score.c,v 1.8 1999/09/08 21:17:57 jsm Exp $");
 #endif
 #endif /* not lint */
 
 # include	"robots.h"
 # include	"pathnames.h"
 
-char	*Scorefile = _PATH_SCORE;
+const char	*Scorefile = _PATH_SCORE;
 
 int	Max_per_uid = MAX_PER_UID;
 
@@ -199,9 +199,10 @@ set_name(scp)
 	SCORE	*scp;
 {
 	PASSWD	*pp;
+	static char unknown[] = "???";
 
 	if ((pp = getpwuid(scp->s_uid)) == NULL)
-		pp->pw_name = "???";
+		pp->pw_name = unknown;
 	strncpy(scp->s_name, pp->pw_name, MAXNAME);
 }
 
@@ -213,7 +214,7 @@ int
 cmp_sc(s1, s2)
 	const void *s1, *s2;
 {
-	return ((SCORE *)s2)->s_score - ((SCORE *)s1)->s_score;
+	return ((const SCORE *)s2)->s_score - ((const SCORE *)s1)->s_score;
 }
 
 /*