The source of the setup program included with DOOM, Final DOOM, Strife, etc.

CONTROL.C

@@ -0,0 +1,87 @@
+//
+// Choose which type of controller to use
+//
+#include "main.h"
+
+enum {CON_MOUSE,CON_JOY,CON_KEY,CON_MAX};
+item_t controlitems[]=
+{
+	{CON_MOUSE,		26,11,28,	-1,-1},
+	{CON_JOY,		26,12,28,	-1,-1},
+	{CON_KEY,		26,13,28,	-1,-1}
+};
+menu_t controlmenu=
+{
+	&controlitems[0],
+	CON_MOUSE,
+	CON_MAX,
+	0x7f
+};
+
+int ChooseController (void)
+{
+	short	key;
+	short field;
+	int   rval = 0;
+
+	SaveScreen();
+	DrawPup(&control);
+
+	// DEFAULT FIELD ========================================
+
+	if (newc.control == C_MOUSE)
+		field = CON_MOUSE;
+   else
+   if (newc.control == C_JOYSTICK)
+      field = CON_JOY;
+   else
+   field = CON_KEY;
+
+	controlmenu.startitem = field;
+	while(1)
+	{
+		SetupMenu(&controlmenu);
+		field = GetMenuInput();
+		key = menukey;
+		switch ( key )
+		{
+			case KEY_ESC:
+				rval = -1;
+				goto func_exit;
+
+         case KEY_ENTER:
+         case KEY_F10:
+         switch ( field )
+         {
+            case CON_KEY:
+               newc.control = C_KEY;
+               usemouse = 0;
+               usejoystick = 0;
+               goto func_exit;
+  
+            case CON_MOUSE:
+               newc.control = C_MOUSE;
+               usemouse = 1;
+               usejoystick = 0;
+               goto func_exit;
+  
+            case CON_JOY:
+               newc.control = C_JOYSTICK;
+               usemouse = 0;
+               usejoystick = 1;
+               goto func_exit;
+  
+            default:
+               break;
+         }
+            break;
+      }
+   }
+  
+   func_exit:
+
+	RestoreScreen();
+	DrawCurrentConfig();
+   return ( rval );
+}
+