--- a/srogue/disply.c	Fri Feb 26 17:30:30 2016 -0500
+++ b/srogue/disply.c	Wed Mar 02 21:28:34 2016 -0500
@@ -18,7 +18,8 @@
  * displevl:
  *	Display detailed level for wizard and scroll
  */
-displevl()
+void
+displevl(void)
 {
 	reg char ch, mch;
 	reg int i,j;
@@ -73,7 +74,8 @@
  * dispmons:
  *	Show monsters for wizard and potion
  */
-dispmons()
+void
+dispmons(void)
 {
 	reg int ch, y, x;
 	reg struct thing *it;
@@ -95,8 +97,8 @@
  * winat:
  *	Get whatever character is at a location on the screen
  */
-winat(y, x)
-int x, y;
+char
+winat(int y, int x)
 {
 	reg char ch;
 
@@ -111,8 +113,8 @@
  * cordok:
  *	Returns TRUE if coordinate is on usable screen
  */
-cordok(y, x)
-int y, x;
+bool
+cordok(int y, int x)
 {
 	if (x < 0 || y < 0 || x >= COLS || y >= LINES - 1)
 		return FALSE;
@@ -123,8 +125,8 @@
  * pl_on:
  *	Returns TRUE if the player's flag is set
  */
-pl_on(what)
-long what;
+bool
+pl_on(long what)
 {
 	return (player.t_flags & what);
 }
@@ -134,8 +136,8 @@
  * pl_off:
  *	Returns TRUE when player's flag is reset
  */
-pl_off(what)
-long what;
+bool
+pl_off(long what)
 {
 	return (!(player.t_flags & what));
 }
@@ -145,9 +147,8 @@
  * o_on:
  *	Returns TRUE in the objects flag is set
  */
-o_on(what,bit)
-struct object *what;
-long bit;
+bool
+o_on(struct object *what, long bit)
 {
 	reg int flag;
 
@@ -162,9 +163,8 @@
  * o_off:
  *	Returns TRUE is the objects flag is reset
  */
-o_off(what,bit)
-struct object *what;
-long bit;
+bool
+o_off(struct object *what, long bit)
 {
 	reg int flag;
 
@@ -179,9 +179,8 @@
  * setoflg:
  *	Set the specified flag for the object
  */
-setoflg(what,bit)
-struct object *what;
-long bit;
+void
+setoflg(struct object *what, long bit)
 {
 	what->o_flags |= bit;
 }
@@ -191,9 +190,8 @@
  * resoflg:
  *	Reset the specified flag for the object
  */
-resoflg(what,bit)
-struct object *what;
-long bit;
+void
+resoflg(struct object *what, long bit)
 {
 	what->o_flags &= ~bit;
 }