From 76024896b02780253ba0cb65e941a430d39303ca Mon Sep 17 00:00:00 2001
From: Andrei Drexler <makro@rq3.com>
Date: Fri, 10 Jun 2022 19:26:14 +0300
Subject: [PATCH] Don't spawn monsters when starting map with nomonsters 1

---
 Quake/host_cmd.c | 13 +++++++++++++
 Quake/pr_edict.c | 23 ++++++++++++++++++++++-
 Quake/server.h   |  1 +
 Quake/sv_main.c  |  3 +++
 4 files changed, 39 insertions(+), 1 deletion(-)

diff --git a/Quake/host_cmd.c b/Quake/host_cmd.c
index b57347ff7..1472887e6 100644
--- a/Quake/host_cmd.c
+++ b/Quake/host_cmd.c
@@ -27,6 +27,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 #endif
 
 extern cvar_t	pausable;
+extern cvar_t	nomonsters;
 
 int	current_skill;
 
@@ -1043,6 +1044,12 @@ static void Host_Savegame_f (void)
 		return;
 	}
 
+	if (sv.nomonsters)
+	{
+		Con_Printf ("Can't save when using \"nomonsters\".\n");
+		return;
+	}
+
 	if (cl.intermission)
 	{
 		Con_Printf ("Can't save in intermission.\n");
@@ -1149,6 +1156,12 @@ static void Host_Loadgame_f (void)
 		return;
 	}
 
+	if (nomonsters.value)
+	{
+		Con_Warning ("\"%s\" disabled automatically.\n", nomonsters.name);
+		Cvar_SetValueQuick (&nomonsters, 0.f);
+	}
+
 	cls.demonum = -1;		// stop demo loop in case this fails
 
 	q_snprintf (name, sizeof(name), "%s/%s", com_gamedir, Cmd_Argv(1));
diff --git a/Quake/pr_edict.c b/Quake/pr_edict.c
index 4888482af..ada808c38 100644
--- a/Quake/pr_edict.c
+++ b/Quake/pr_edict.c
@@ -993,6 +993,7 @@ to call ED_CallSpawnFunctions () to let the objects initialize themselves.
 */
 void ED_LoadFromFile (const char *data)
 {
+	const char	*classname;
 	dfunction_t	*func;
 	edict_t		*ent = NULL;
 	int		inhibit = 0;
@@ -1045,8 +1046,16 @@ void ED_LoadFromFile (const char *data)
 			continue;
 		}
 
+		classname = PR_GetString (ent->v.classname);
+		if (sv.nomonsters && !Q_strncmp (classname, "monster_", 8))
+		{
+			ED_Free (ent);
+			inhibit++;
+			continue;
+		}
+
 	// look for the spawn function
-		func = ED_FindFunction ( PR_GetString(ent->v.classname) );
+		func = ED_FindFunction (classname);
 
 		if (!func)
 		{
@@ -1262,6 +1271,17 @@ void PR_LoadProgs (void)
 	pr_effects_mask = PR_FindSupportedEffects ();
 }
 
+/*
+===============
+ED_Nomonsters_f
+===============
+*/
+static void ED_Nomonsters_f (cvar_t *cvar)
+{
+	if (cvar->value)
+		Con_Warning ("\"%s\" can break gameplay.\n", cvar->name);
+}
+
 
 /*
 ===============
@@ -1275,6 +1295,7 @@ void PR_Init (void)
 	Cmd_AddCommand ("edictcount", ED_Count);
 	Cmd_AddCommand ("profile", PR_Profile_f);
 	Cvar_RegisterVariable (&nomonsters);
+	Cvar_SetCallback (&nomonsters, ED_Nomonsters_f);
 	Cvar_RegisterVariable (&gamecfg);
 	Cvar_RegisterVariable (&scratch1);
 	Cvar_RegisterVariable (&scratch2);
diff --git a/Quake/server.h b/Quake/server.h
index 2842a2758..001ee4ba6 100644
--- a/Quake/server.h
+++ b/Quake/server.h
@@ -46,6 +46,7 @@ typedef struct
 
 	qboolean	paused;
 	qboolean	loadgame;			// handle connections specially
+	qboolean	nomonsters;			// server started with 'nomonsters' cvar active
 
 	double		time;
 
diff --git a/Quake/sv_main.c b/Quake/sv_main.c
index 4212f1cca..100151a10 100644
--- a/Quake/sv_main.c
+++ b/Quake/sv_main.c
@@ -33,6 +33,8 @@ int		sv_protocol = PROTOCOL_FITZQUAKE; //johnfitz
 extern qboolean	pr_alpha_supported; //johnfitz
 extern int pr_effects_mask;
 
+extern cvar_t nomonsters;
+
 //============================================================================
 
 /*
@@ -1537,6 +1539,7 @@ void SV_SpawnServer (const char *server)
 
 	sv.state = ss_loading;
 	sv.paused = false;
+	sv.nomonsters = (nomonsters.value != 0.f);
 
 	sv.time = 1.0;