From 3235351b99a8d134dab228f48f6585a8e4ac787f Mon Sep 17 00:00:00 2001
From: Inuyasha <MattWCSTRFAN@gmail.com>
Date: Wed, 11 May 2016 14:33:50 -0700
Subject: [PATCH] And now Lua yells at you for doing what I just fixed

---
 src/lua_baselib.c |  4 ++++
 src/lua_script.h  | 11 +++++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/lua_baselib.c b/src/lua_baselib.c
index 525f2fe68..20342d33e 100644
--- a/src/lua_baselib.c
+++ b/src/lua_baselib.c
@@ -115,6 +115,8 @@ static int lib_pRandomKey(lua_State *L)
 	INT32 a = (INT32)luaL_checkinteger(L, 1);
 
 	NOHUD
+	if (a > 65536)
+		LUA_UsageWarning(L, "P_RandomKey: range > 65536 is undefined behavior");
 	lua_pushinteger(L, P_RandomKey(a));
 	return 1;
 }
@@ -130,6 +132,8 @@ static int lib_pRandomRange(lua_State *L)
 		a = b;
 		b = c;
 	}
+	if ((b-a+1) > 65536)
+		LUA_UsageWarning(L, "P_RandomRange: range > 65536 is undefined behavior");
 	lua_pushinteger(L, P_RandomRange(a, b));
 	return 1;
 }
diff --git a/src/lua_script.h b/src/lua_script.h
index 45fab2f53..447d3d686 100644
--- a/src/lua_script.h
+++ b/src/lua_script.h
@@ -81,4 +81,15 @@ void COM_Lua_f(void);
 	}\
 }
 
+// Warnings about incorrect function usage.
+// Shows once, then never again, like deprecation
+#define LUA_UsageWarning(L, warningmsg)\
+{\
+	static UINT8 seen = 0;\
+	if (!seen) {\
+		seen = 1;\
+		CONS_Alert(CONS_WARNING,"%s\n", warningmsg);\
+	}\
+}
+
 #endif