fteqw/engine/common/plugin.c

//This file should be easily portable.
//The biggest strength of this plugin system is that ALL interactions are performed via
//named functions, this makes it *really* easy to port plugins from one engine to annother.

#include "quakedef.h"
#include "fs.h"

#define PLUG_NONE 0
#define PLUG_NATIVE 1
#define PLUG_QVM 2
#define PLUG_EITHER 3

#ifdef PLUGINS

cvar_t plug_sbar = CVARD("plug_sbar", "3", "Controls whether plugins are allowed to draw the hud, rather than the engine (when allowed by csqc). This is typically used to permit the ezhud plugin without needing to bother unloading it.\n=0: never use hud plugins.\n&1: Use hud plugins in deathmatch.\n&2: Use hud plugins in singleplayer/coop.\n=3: Always use hud plugins (when loaded).");
cvar_t plug_loaddefault = SCVAR("plug_loaddefault", "1");

qintptr_t Plug_Bullet_Init(qintptr_t *args);
qintptr_t Plug_ODE_Init(qintptr_t *args);
struct
{
	const char *name;
	qintptr_t (*initfunction)(qintptr_t *args);
} staticplugins[] = 
{
#if defined(USERBE) && !defined(QUAKETC)
//	{"Bullet", Plug_Bullet_Init},
	{"ODE", Plug_ODE_Init},
#endif
	{NULL}
};


#ifdef GLQUAKE
#include "glquake.h"
#endif

//custom plugin builtins.
typedef qintptr_t (EXPORT_FN *Plug_Builtin_t)(void *offset, quintptr_t mask, const qintptr_t *arg);
void Plug_RegisterBuiltin(char *name, Plug_Builtin_t bi, int flags);
#define PLUG_BIF_DLLONLY	1	//WARNING: it is not enough to just specify this flag, but also the builtin code must return if there is an offset passed.
#define PLUG_BIF_QVMONLY	2
#define PLUG_BIF_NEEDSRENDERER 4

#include "netinc.h"

typedef struct plugin_s {
	char *name;
	vm_t *vm;

	int blockcloses;

	void *inputptr;
	size_t inputbytes;

	qintptr_t tick;
	qintptr_t executestring;
#ifndef SERVERONLY
	qintptr_t consolelink;
	qintptr_t consolelinkmouseover;
	qintptr_t conexecutecommand;
	qintptr_t menufunction;
	qintptr_t sbarlevel[3];	//0 - main sbar, 1 - supplementry sbar sections (make sure these can be switched off), 2 - overlays (scoreboard). menus kill all.
	qintptr_t reschange;

	//protocol-in-a-plugin
	qintptr_t connectionlessclientpacket;

	//called to discolour console input text if they spelt it wrongly
	qintptr_t spellcheckmaskedtext;
#endif
	qintptr_t svmsgfunction;
	qintptr_t chatmsgfunction;
	qintptr_t centerprintfunction;
	qintptr_t shutdown;

	struct plugin_s *next;
} plugin_t;

int Plug_SubConsoleCommand(console_t *con, char *line);

plugin_t *currentplug;



#ifndef SERVERONLY
#include "cl_plugin.inc"
#else
void Plug_Client_Init(void){}
void Plug_Client_Close(plugin_t *plug) {}
#endif


void Plug_Init(void);
void Plug_Close(plugin_t *plug);

void Plug_Tick(void);
qboolean Plugin_ExecuteString(void);


static plugin_t *plugs;


typedef struct {
	char *name;
	Plug_Builtin_t func;
	int flags;
} Plug_Plugins_t;
Plug_Plugins_t *plugbuiltins;
int numplugbuiltins;

void Plug_RegisterBuiltin(char *name, Plug_Builtin_t bi, int flags)
{
	//randomize the order a little.
	int newnum;

	newnum = (rand()%128)+1;
	while(newnum < numplugbuiltins && plugbuiltins[newnum].func)
		newnum+=128;

	if (newnum >= numplugbuiltins)
	{
		int newbuiltins = newnum+128;
		plugbuiltins = BZ_Realloc(plugbuiltins, sizeof(Plug_Plugins_t)*newbuiltins);
		memset(plugbuiltins + numplugbuiltins, 0, sizeof(Plug_Plugins_t)*(newbuiltins - numplugbuiltins));
		numplugbuiltins = newbuiltins;
	}

	//got an empty number.
	Con_DPrintf("%s: %i\n", name, newnum);
	plugbuiltins[newnum].name = name;
	plugbuiltins[newnum].func = bi;
	plugbuiltins[newnum].flags = flags;
}

static qintptr_t VARGS Plug_GetNativePointer(void *offset, quintptr_t mask, const qintptr_t *args)
{
	char *p = (char *)VM_POINTER(args[0]);
	if (offset)	//QVMs are not allowed to call this
		return 0;
#ifdef SUPPORT_ICE
	if (!strcmp(p, ICE_API_CURRENT))
		return (qintptr_t)&iceapi;
#endif

	return (qintptr_t)NULL;
}

/*
static void Plug_RegisterBuiltinIndex(char *name, Plug_Builtin_t bi, int flags, int index)	//I d
{
	//randomize the order a little.
	int newnum;

	newnum = rand()%128;
	while(newnum+1 < numplugbuiltins && plugbuiltins[newnum+1].func)
		newnum+=128;

	newnum++;

	if (newnum >= numplugbuiltins)
	{
		numplugbuiltins = newnum+128;
		plugbuiltins = BZ_Realloc(plugbuiltins, sizeof(Plug_Plugins_t)*numplugbuiltins);
	}

	//got an empty number.
	plugbuiltins[newnum].name = name;
	plugbuiltins[newnum].func = bi;
}
*/

static qintptr_t Plug_FindBuiltin(qboolean native, const char *p)
{
	int i;
	for (i = 0; i < numplugbuiltins; i++)
		if (plugbuiltins[i].name)
			if (p && !strcmp(plugbuiltins[i].name, p))
			{
				if (!native && plugbuiltins[i].flags & PLUG_BIF_DLLONLY)
					return 0;	//block it, if not native
				if (native && plugbuiltins[i].flags & PLUG_BIF_QVMONLY)
					return 0;	//block it, if not native
				return -i;
			}

	return 0;
}
static qintptr_t VARGS Plug_GetBuiltin(void *offset, quintptr_t mask, const qintptr_t *args)
{
	char *p = (char *)VM_POINTER(args[0]);
	return Plug_FindBuiltin(!offset, p);
}

static int Plug_SystemCallsVM(void *offset, quintptr_t mask, int fn, const int *arg)
{
#if FTE_WORDSIZE == 32
	#define args arg
#else
	qintptr_t args[9];

	args[0]=arg[0];
	args[1]=arg[1];
	args[2]=arg[2];
	args[3]=arg[3];
	args[4]=arg[4];
	args[5]=arg[5];
	args[6]=arg[6];
	args[7]=arg[7];
	args[8]=arg[8];
#endif

	fn = fn+1;

	if (fn>=0 && fn < numplugbuiltins && plugbuiltins[fn].func!=NULL)
		return plugbuiltins[fn].func(offset, mask, (qintptr_t*)args);
#undef args
	Sys_Error("QVM Plugin tried calling invalid builtin %i", fn);
	return 0;
}

//I'm not keen on this.
//but dlls call it without saying what sort of vm it comes from, so I've got to have them as specifics
static qintptr_t EXPORT_FN Plug_SystemCallsNative(qintptr_t arg, ...)
{
	qintptr_t args[9];
	va_list argptr;

	va_start(argptr, arg);
	args[0]=va_arg(argptr, qintptr_t);
	args[1]=va_arg(argptr, qintptr_t);
	args[2]=va_arg(argptr, qintptr_t);
	args[3]=va_arg(argptr, qintptr_t);
	args[4]=va_arg(argptr, qintptr_t);
	args[5]=va_arg(argptr, qintptr_t);
	args[6]=va_arg(argptr, qintptr_t);
	args[7]=va_arg(argptr, qintptr_t);
	args[8]=va_arg(argptr, qintptr_t);
	va_end(argptr);

	arg = -arg;

	if (arg>=0 && arg < numplugbuiltins && plugbuiltins[arg].func)
		return plugbuiltins[arg].func(NULL, ~0, args);

	Sys_Error("DLL Plugin tried calling invalid builtin %i", (int)arg);
	return 0;
}
qintptr_t (QDECL *plugin_syscall)( qintptr_t arg, ... ) = Plug_SystemCallsNative;

plugin_t *Plug_Load(const char *file, int type)
{
	plugin_t *newplug;

	for (newplug = plugs; newplug; newplug = newplug->next)
	{
		if (!Q_strcasecmp(newplug->name, file))
			return newplug;
	}

	newplug = Z_Malloc(sizeof(plugin_t)+strlen(file)+1);
	newplug->name = (char*)(newplug+1);
	strcpy(newplug->name, file);

	if (!newplug->vm && (type & PLUG_NATIVE))
		newplug->vm = VM_Create(va("fteplug_%s_", file), Plug_SystemCallsNative, NULL);
	if (!newplug->vm && (type & PLUG_NATIVE))
		newplug->vm = VM_Create(va("fteplug_%s", file), Plug_SystemCallsNative, NULL);
	if (!newplug->vm && (type & PLUG_QVM))
		newplug->vm = VM_Create(file, NULL, Plug_SystemCallsVM);
	if (!newplug->vm && (type & PLUG_NATIVE))
	{
		unsigned int u;
		for (u = 0; staticplugins[u].name; u++)
		{
			if (!Q_strcasecmp(file, staticplugins[u].name))
				newplug->vm = VM_CreateBuiltin(file, Plug_SystemCallsNative, staticplugins[u].initfunction);
			break;
		}
	}

	currentplug = newplug;
	if (newplug->vm)
	{
		Con_DPrintf("Created plugin %s\n", file);

		newplug->next = plugs;
		plugs = newplug;

		if (!VM_Call(newplug->vm, 0, Plug_FindBuiltin(true, "Plug_GetEngineFunction")))
		{
			Plug_Close(newplug);
			return NULL;
		}

#ifndef SERVERONLY
		if (newplug->reschange)
			VM_Call(newplug->vm, newplug->reschange, vid.width, vid.height);
#endif
	}
	else
	{
		Z_Free(newplug);
		newplug = NULL;
	}
	currentplug = NULL;

	return newplug;
}

static int QDECL Plug_Emumerated (const char *name, qofs_t size, time_t mtime, void *param, searchpathfuncs_t *spath)
{
	char vmname[MAX_QPATH];
	Q_strncpyz(vmname, name, sizeof(vmname));
	vmname[strlen(vmname) - strlen(param)] = '\0';
	if (!Plug_Load(vmname, PLUG_QVM))
		Con_Printf("Couldn't load plugin %s\n", vmname);

	return true;
}
static int QDECL Plug_EnumeratedRoot (const char *name, qofs_t size, time_t mtime, void *param, searchpathfuncs_t *spath)
{
	char vmname[MAX_QPATH];
	int len;
	char *dot;
	if (!strncmp(name, "fteplug_", 8))
		name += 8;
	Q_strncpyz(vmname, name, sizeof(vmname));
	len = strlen(vmname);
	len -= strlen(ARCH_CPU_POSTFIX ARCH_DL_POSTFIX);
	if (!strcmp(vmname+len, ARCH_CPU_POSTFIX ARCH_DL_POSTFIX))
		vmname[len] = 0;
	else
	{
		dot = strchr(vmname, '.');
		if (dot)
			*dot = 0;
	}
	len = strlen(vmname);
	if (len > 0 && vmname[len-1] == '_')
		vmname[len-1] = 0;
	if (!Plug_Load(vmname, PLUG_NATIVE))
		Con_Printf("Couldn't load plugin %s\n", vmname);

	return true;
}

static qintptr_t VARGS Plug_Con_Print(void *offset, quintptr_t mask, const qintptr_t *arg)
{
//	if (qrenderer == QR_NONE)
//		return false;
	Con_Printf("%s", (char*)VM_POINTER(arg[0]));
	return 0;
}
static qintptr_t VARGS Plug_Sys_Error(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	Sys_Error("%s", (char*)offset+arg[0]);
	return 0;
}
static qintptr_t VARGS Plug_Sys_Milliseconds(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	return Sys_DoubleTime()*1000;
}
static qintptr_t VARGS Plug_Sys_LoadLibrary(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	if (offset)
		return 0;
	return (qintptr_t)Sys_LoadLibrary(VM_POINTER(arg[0]), VM_POINTER(arg[1]));
}
static qintptr_t VARGS Plug_Sys_CloseLibrary(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	if (offset)
		return 0;
	Sys_CloseLibrary(VM_POINTER(arg[0]));
	return 1;
}
static qintptr_t VARGS Plug_ExportToEngine(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = (char*)VM_POINTER(arg[0]);
	quintptr_t functionid = arg[1];

	if (!strcmp(name, "Tick"))					//void(int realtime)
		currentplug->tick = functionid;
	else if (!strcmp(name, "ExecuteCommand"))	//bool(isinsecure)
		currentplug->executestring = functionid;
	else if (!strcmp(name, "Shutdown"))			//void()
		currentplug->shutdown = functionid;
#ifndef SERVERONLY
	else if (!strcmp(name, "ConsoleLink"))
		currentplug->consolelink = functionid;
	else if (!strcmp(name, "ConsoleLinkMouseOver"))
		currentplug->consolelinkmouseover = functionid;
	else if (!strcmp(name, "ConExecuteCommand"))
		currentplug->conexecutecommand = functionid;
	else if (!strcmp(name, "MenuEvent"))
		currentplug->menufunction = functionid;
	else if (!strcmp(name, "UpdateVideo"))
		currentplug->reschange = functionid;
	else if (!strcmp(name, "SbarBase"))			//basic SBAR.
		currentplug->sbarlevel[0] = functionid;
	else if (!strcmp(name, "SbarSupplement"))	//supplementry stuff - teamplay
		currentplug->sbarlevel[1] = functionid;
	else if (!strcmp(name, "SbarOverlay"))		//overlay - scoreboard type stuff.
		currentplug->sbarlevel[2] = functionid;
	else if (!strcmp(name, "ConnectionlessClientPacket"))
		currentplug->connectionlessclientpacket = functionid;
	else if (!strcmp(name, "ServerMessageEvent"))
		currentplug->svmsgfunction = functionid;
	else if (!strcmp(name, "ChatMessageEvent"))
		currentplug->chatmsgfunction = functionid;
	else if (!strcmp(name, "CenterPrintMessage"))
		currentplug->centerprintfunction = functionid;
	else if (!strcmp(name, "SpellCheckMaskedText"))
		currentplug->spellcheckmaskedtext = functionid;
#endif
	else
		return 0;
	return 1;
}

//retrieve a plugin's name
static qintptr_t VARGS Plug_GetPluginName(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int plugnum = VM_LONG(arg[0]);
	plugin_t *plug;
	//int plugnum (0 for current), char *buffer, int bufferlen

	if (VM_OOB(arg[1], arg[2]))
		return false;

	if (plugnum <= 0)
	{
		Q_strncpyz(VM_POINTER(arg[1]), currentplug->name, VM_LONG(arg[2]));
		return true;
	}

	for (plug = plugs; plug; plug = plug->next)
	{
		if (--plugnum == 0)
		{
			Q_strncpyz(VM_POINTER(arg[1]), plug->name, VM_LONG(arg[2]));
			return true;
		}
	}
	return false;
}

static qintptr_t VARGS Plug_ExportNative(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *func;
	char *name = (char*)VM_POINTER(arg[0]);

	if (offset)	//QVMs are not allowed to call this
		return 0;

	arg++;

	func = ((void**)arg)[0];

	if (!strcmp(name, "UnsafeClose"))
	{
		//not used by the engine, but stops the user from being able to unload the plugin.
		//this is useful for certain things, like if the plugin uses some external networking or direct disk access or whatever.
		currentplug->blockcloses++;
	}
	else if (!strncmp(name, "FS_RegisterArchiveType_", 23))	//module as in pak/pk3
	{
		FS_RegisterFileSystemType(currentplug, name+23, func, true);
	}
	/*
	else if (!strncmp(name, "S_OutputDriver"))	//a sound driver (takes higher priority over the built-in ones)
	{
		S_RegisterOutputDriver(name + 13, func);
		currentplug->blockcloses++;
	}
	*/
	/*
	else if (!strncmp(name, "VID_DisplayDriver"))	//a video driver, loaded by name as given by vid_renderer
	{
		FS_RegisterModuleDriver(, func);
		currentplug->blockcloses++;
	}
	*/
#if defined(PLUGINS) && !defined(NOMEDIA) && !defined(SERVERONLY)
	else if (!strcmp(name, "Media_VideoDecoder"))
	{
		Media_RegisterDecoder(currentplug, func);
//		currentplug->blockcloses++;
	}
	else if (!strcmp(name, "Media_VideoEncoder"))
	{
		Media_RegisterEncoder(currentplug, func);
//		currentplug->blockcloses++;
	}
#endif

#ifndef SERVERONLY
	else if (!strcmp(name, "S_LoadSound"))	//a hook for loading extra types of sound (wav, mp3, ogg, midi, whatever you choose to support)
	{
		S_RegisterSoundInputPlugin((void*)func);
		currentplug->blockcloses++;
	}
#endif
	else
		return 0;
	return 1;
}

static qintptr_t VARGS Plug_Cvar_GetNVFDG(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = VM_POINTER(arg[0]);
	char *defaultvalue = VM_POINTER(arg[1]);
	unsigned int flags = VM_LONG(arg[2]);
	char *description = VM_POINTER(arg[3]);
	char *groupname = VM_POINTER(arg[4]);

	if (!defaultvalue)
		return (qintptr_t)Cvar_FindVar(name);
	return (qintptr_t)Cvar_Get2(name, defaultvalue, flags&1, description, groupname);
}


typedef struct {
	//Make SURE that the engine has resolved all cvar pointers into globals before this happens.
	plugin_t *plugin;
	cvar_t *var;
} plugincvararray_t;
int plugincvararraylen;
plugincvararray_t *plugincvararray;
//qhandle_t Cvar_Register (char *name, char *defaultval, int flags, char *grouphint);
static qintptr_t VARGS Plug_Cvar_Register(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = VM_POINTER(arg[0]);
	char *defaultvalue = VM_POINTER(arg[1]);
	unsigned int flags = VM_LONG(arg[2]);
	char *groupname = VM_POINTER(arg[3]);
	cvar_t *var;
	int i;

	var = Cvar_Get(name, defaultvalue, flags&1, groupname);

	for (i = 0; i < plugincvararraylen; i++)
	{
		if (!plugincvararray[i].var)
		{	//hmm... a gap...
			plugincvararray[i].plugin = currentplug;
			plugincvararray[i].var = var;
			return i;
		}
	}

	i = plugincvararraylen;
	plugincvararraylen++;
	plugincvararray = BZ_Realloc(plugincvararray, (plugincvararraylen)*sizeof(plugincvararray_t));
	plugincvararray[i].plugin = currentplug;
	plugincvararray[i].var = var;
	return i;
}
//int Cvar_Update, (qhandle_t handle, int modificationcount, char *stringv, float *floatv));	//stringv is 256 chars long, don't expect this function to do anything if modification count is unchanged.
static qintptr_t VARGS Plug_Cvar_Update(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int handle;
//	int modcount;
	char *stringv;	//255 bytes long.
	float *floatv;
	cvar_t *var;
	handle = VM_LONG(arg[0]);
	if (handle < 0 || handle >= plugincvararraylen)
		return 0;
	if (plugincvararray[handle].plugin != currentplug)
		return 0;	//I'm not letting you know what annother plugin has registered.

	if (VM_OOB(arg[2], 256) || VM_OOB(arg[3], 4))	//Oi, plugin - you screwed up
		return 0;

	//modcount = VM_LONG(arg[1]);	//for future optimisation
	stringv = VM_POINTER(arg[2]);
	floatv = VM_POINTER(arg[3]);

	var = plugincvararray[handle].var;

	//if (var->modified != modcount)	//for future optimisation
	{
		strcpy(stringv, var->string);
		*floatv = var->value;
	}
	return var->modified;
}

//void Cmd_Args(char *buffer, int buffersize)
static qintptr_t VARGS Plug_Cmd_Args(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *buffer = (char*)VM_POINTER(arg[0]);
	char *args;
	args = Cmd_Args();
	if (strlen(args)+1>arg[1])
		return 0;
	strcpy(buffer, args);
	return 1;
}
//void Cmd_Argv(int num, char *buffer, int buffersize)
static qintptr_t VARGS Plug_Cmd_Argv(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *buffer = (char*)VM_POINTER(arg[1]);
	char *args;
	args = Cmd_Argv(arg[0]);
	if (strlen(args)+1>arg[2])
		return 0;
	strcpy(buffer, args);
	return 1;
}
//int Cmd_Argc(void)
static qintptr_t VARGS Plug_Cmd_Argc(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	return Cmd_Argc();
}

//void Cvar_SetString (char *name, char *value);
static qintptr_t VARGS Plug_Cvar_SetString(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = VM_POINTER(arg[0]),
		*value = VM_POINTER(arg[1]);
	cvar_t *var = Cvar_Get(name, value, 0, "Plugin vars");
	if (var)
	{
		Cvar_Set(var, value);
		return 1;
	}

	return 0;
}

//void Cvar_SetFloat (char *name, float value);
static qintptr_t VARGS Plug_Cvar_SetFloat(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = VM_POINTER(arg[0]);
	float value = VM_FLOAT(arg[1]);
	cvar_t *var = Cvar_Get(name, "", 0, "Plugin vars");	//"" because I'm lazy
	if (var)
	{
		Cvar_SetValue(var, value);
		return 1;
	}

	return 0;
}

//void Cvar_GetFloat (char *name);
static qintptr_t VARGS Plug_Cvar_GetFloat(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name = VM_POINTER(arg[0]);
	int ret;
	cvar_t *var;
#ifndef CLIENTONLY
	if (!strcmp(name, "sv.state"))
		VM_FLOAT(ret) = sv.state;
	else
#endif
	{
		var = Cvar_Get(name, "", 0, "Plugin vars");
		if (var)
		{
			VM_FLOAT(ret) = var->value;
		}
		else
			VM_FLOAT(ret) = 0;
	}
	return ret;
}

//qboolean Cvar_GetString (char *name, char *retstring, int sizeofretstring);
static qintptr_t VARGS Plug_Cvar_GetString(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *name, *ret;
	int retsize;
	cvar_t *var;
	if (VM_OOB(arg[1], arg[2]))
	{
		return false;
	}

	name = VM_POINTER(arg[0]);
	ret = VM_POINTER(arg[1]);
	retsize = VM_LONG(arg[2]);

	if (!strcmp(name, "sv.mapname"))
	{
#ifdef CLIENTONLY
		Q_strncpyz(ret, "", retsize);
#else
		Q_strncpyz(ret, svs.name, retsize);
#endif
	}
	else
	{
		var = Cvar_Get(name, "", 0, "Plugin vars");
		if (strlen(var->name)+1 > retsize)
			return false;

		strcpy(ret, var->string);
	}

	return true;
}

//void Cmd_AddText (char *text, qboolean insert);	//abort the entire engine.
static qintptr_t VARGS Plug_Cmd_AddText(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	if (VM_LONG(arg[1]))
		Cbuf_InsertText(VM_POINTER(arg[0]), RESTRICT_LOCAL, false);
	else
		Cbuf_AddText(VM_POINTER(arg[0]), RESTRICT_LOCAL);

	return 1;
}

int plugincommandarraylen;
typedef struct {
	plugin_t *plugin;
	char command[64];
} plugincommand_t;
plugincommand_t *plugincommandarray;
void Plug_Command_f(void)
{
	int i;
	char *cmd = Cmd_Argv(0);
	plugin_t *oldplug = currentplug;
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (!plugincommandarray[i].plugin)
			continue;	//don't check commands who's owners died.

		if (stricmp(plugincommandarray[i].command, cmd))	//not the right command
			continue;

		currentplug = plugincommandarray[i].plugin;

		if (currentplug->executestring)
			VM_Call(currentplug->vm, currentplug->executestring, Cmd_IsInsecure(), 0, 0, 0);
		break;
	}

	currentplug = oldplug;
}

static qintptr_t VARGS Plug_Cmd_AddCommand(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int i;
	char *name = VM_POINTER(arg[0]);
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (!plugincommandarray[i].plugin)
			break;
		if (plugincommandarray[i].plugin == currentplug)
		{
			if (!strcmp(name, plugincommandarray[i].command))
				return true;	//already registered
		}
	}
	if (i == plugincommandarraylen)
	{
		plugincommandarraylen++;
		plugincommandarray = BZ_Realloc(plugincommandarray, plugincommandarraylen*sizeof(plugincommand_t));
	}

	Q_strncpyz(plugincommandarray[i].command, name, sizeof(plugincommandarray[i].command));
	if (!Cmd_AddCommand(plugincommandarray[i].command, Plug_Command_f))
		return false;
	plugincommandarray[i].plugin = currentplug;	//worked
	return true;
}
static void VARGS Plug_FreeConCommands(plugin_t *plug)
{
	int i;
	for (i = 0; i < plugincommandarraylen; i++)
	{
		if (plugincommandarray[i].plugin == plug)
		{
			plugincommandarray[i].plugin = NULL;
			Cmd_RemoveCommand(plugincommandarray[i].command);
		}
	}
}

typedef enum{
	STREAM_NONE,
	STREAM_SOCKET,
	STREAM_VFS
} plugstream_e;

typedef struct {
	plugin_t *plugin;
	plugstream_e type;
	int socket;
	vfsfile_t *vfs;
	struct {
		char filename[MAX_QPATH];
		qbyte *buffer;
		int buflen;
		int curlen;
		int curpos;
	} file;
} pluginstream_t;
pluginstream_t *pluginstreamarray;
int pluginstreamarraylen;

static int Plug_NewStreamHandle(plugstream_e type)
{
	int i;
	for (i = 0; i < pluginstreamarraylen; i++)
	{
		if (!pluginstreamarray[i].plugin)
			break;
	}
	if (i >= pluginstreamarraylen)
	{
		pluginstreamarraylen=i+16;
		pluginstreamarray = BZ_Realloc(pluginstreamarray, pluginstreamarraylen*sizeof(pluginstream_t));
	}

	memset(&pluginstreamarray[i], 0, sizeof(pluginstream_t));
	pluginstreamarray[i].plugin = currentplug;
	pluginstreamarray[i].type = type;
	pluginstreamarray[i].socket = -1;
	pluginstreamarray[i].file.buffer = NULL;
	*pluginstreamarray[i].file.filename = '\0';

	return i;
}

#ifdef HAVE_PACKET
//EBUILTIN(int, NET_TCPListen, (char *ip, int port, int maxcount));
//returns a new socket with listen enabled.
static qintptr_t VARGS Plug_Net_TCPListen(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int handle;
	int sock;
	struct sockaddr_qstorage address;
	int _true = 1;
	int alen;

	char *localip = VM_POINTER(arg[0]);
	unsigned short localport = VM_LONG(arg[1]);
	int maxcount = VM_LONG(arg[2]);

	netadr_t a;
	if (!currentplug)
		return -3;	//streams depend upon current plugin context. which isn't valid in a thread.
	if (!localip)
		localip = "0.0.0.0";	//pass "[::]" for ipv6

	if (!NET_StringToAdr(localip, localport, &a))
		return -1;
	NetadrToSockadr(&a, &address);

	switch(((struct sockaddr*)&address)->sa_family)
	{
	case AF_INET:
		alen = sizeof(struct sockaddr_in);
		break;
#ifdef IPPROTO_IPV6
	case AF_INET6:
		alen = sizeof(struct sockaddr_in6);
		break;
#endif
	default:
		return -2;
	}


	if ((sock = socket(((struct sockaddr*)&address)->sa_family, SOCK_STREAM, 0)) == -1)
	{
		Con_Printf("Failed to create socket\n");
		return -2;
	}
	if (ioctlsocket (sock, FIONBIO, (u_long *)&_true) == -1)
	{
		closesocket(sock);
		return -2;
	}
	setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char *)&_true, sizeof(_true));

	if (bind (sock, (void *)&address, alen) == -1)
	{
		closesocket(sock);
		return -2;
	}
	if (listen (sock, maxcount) == -1)
	{
		closesocket(sock);
		return -2;
	}

	handle = Plug_NewStreamHandle(STREAM_SOCKET);
	pluginstreamarray[handle].socket = sock;

	return handle;

}
static qintptr_t VARGS Plug_Net_Accept(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int handle = VM_LONG(arg[0]);
	struct sockaddr_in address;
	int addrlen;
	int sock;
	int _true = 1;
	char adr[MAX_ADR_SIZE];

	if (!currentplug || handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug || pluginstreamarray[handle].type != STREAM_SOCKET)
		return -2;
	sock = pluginstreamarray[handle].socket;

	if (sock < 0)
		return -1;

	addrlen = sizeof(address);
	sock = accept(sock, (struct sockaddr *)&address, &addrlen);
	if (sock < 0)
		return -1;

	if (ioctlsocket (sock, FIONBIO, (u_long *)&_true) == -1)	//now make it non blocking.
	{
		closesocket(sock);
		return -1;
	}

	if (arg[2] && !VM_OOB(arg[1], arg[2]))
	{
		netadr_t a;
		char *s;
		SockadrToNetadr((struct sockaddr_qstorage *)&address, &a);
		s = NET_AdrToString(adr, sizeof(adr), &a);
		Q_strncpyz(VM_POINTER(arg[1]), s, addrlen);
	}

	handle = Plug_NewStreamHandle(STREAM_SOCKET);
	pluginstreamarray[handle].socket = sock;

	return handle;
}
//EBUILTIN(int, NET_TCPConnect, (char *ip, int port));
qintptr_t VARGS Plug_Net_TCPConnect(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *remoteip = VM_POINTER(arg[0]);
	unsigned short remoteport = VM_LONG(arg[1]);

	int handle;
	vfsfile_t *stream = FS_OpenTCP(remoteip, remoteport);
	if (!currentplug || !stream)
		return -1;
	handle = Plug_NewStreamHandle(STREAM_VFS);
	pluginstreamarray[handle].vfs = stream;
	return handle;

}


void Plug_Net_Close_Internal(int handle);
vfsfile_t *FS_OpenSSL(const char *hostname, vfsfile_t *source, qboolean server);
#ifdef HAVE_SSL
qintptr_t VARGS Plug_Net_SetTLSClient(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	pluginstream_t *stream;
	int handle = VM_LONG(arg[0]);
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
	{
		Con_Printf("Plug_Net_SetTLSClient: socket does not belong to you (or is invalid)\n");
		return -2;
	}
	stream = &pluginstreamarray[handle];
	if (stream->type != STREAM_VFS)
	{	//not a socket - invalid
		Con_Printf("Plug_Net_SetTLSClient: Not a socket handle\n");
		return -2;
	}

	stream->vfs = FS_OpenSSL(VM_POINTER(arg[1]), stream->vfs, false);
	if (!stream->vfs)
	{
		Plug_Net_Close_Internal(handle);
		return -1;
	}
	return 0;
}
#endif
#endif

qintptr_t VARGS Plug_VFS_Open(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	char *fname = VM_POINTER(arg[0]);
	vfsfile_t **handle = VM_POINTER(arg[1]);
	char *mode = VM_POINTER(arg[2]);
	*handle = offset?NULL:FS_OpenVFS(fname, mode, FS_GAME);
	if (*handle)
		return true;
	return false;
}

qintptr_t VARGS Plug_FS_Open(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	//modes:
	//1: read
	//2: write

	//char *name, int *handle, int mode

	//return value is length of the file.

	int handle;
	int *ret;
	//char *data;
	char *mode;
	vfsfile_t *f;
	char *fname = VM_POINTER(arg[0]);

	if (VM_OOB(arg[1], sizeof(int)))
		return -2;
	ret = VM_POINTER(arg[1]);
	*ret = -1;
	if (!currentplug)
		return -3;	//streams depend upon current plugin context. which isn't valid in a thread.

	switch(arg[2])
	{
	case 1:
		mode = "rb";
		break;
	case 2:
		mode = "wb";
		break;
	default:
		return -2;
	}
	if (!strcmp(fname, "**plugconfig"))
		f = FS_OpenVFS(va("%s.cfg", currentplug->name), mode, FS_ROOT);
	else if (arg[2] == 2)
		f = FS_OpenVFS(fname, mode, FS_GAMEONLY);
	else
		f = FS_OpenVFS(fname, mode, FS_GAME);
	if (!f)
		return -1;
	handle = Plug_NewStreamHandle(STREAM_VFS);
	pluginstreamarray[handle].vfs = f;
	*ret = handle;
	return VFS_GETLEN(pluginstreamarray[handle].vfs);
}
qintptr_t VARGS Plug_FS_Seek(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int handle = arg[0];
	unsigned int low = arg[1], high = arg[2];
	pluginstream_t *stream;

	stream = &pluginstreamarray[handle];
	if (stream->type != STREAM_VFS)
		return -1;
	VFS_SEEK(stream->vfs, low | ((unsigned long long)high<<32));
	return VFS_TELL(stream->vfs);
}

qintptr_t VARGS Plug_memset(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *p = VM_POINTER(arg[0]);

	if (VM_OOB(arg[0], arg[2]))
		return false;

	if (p)
		memset(p, VM_LONG(arg[1]), VM_LONG(arg[2]));

	return arg[0];
}
qintptr_t VARGS Plug_memcpy(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *p1 = VM_POINTER(arg[0]);
	void *p2 = VM_POINTER(arg[1]);

	if (VM_OOB(arg[0], arg[2]))
		return false;

	if (VM_OOB(arg[1], arg[2]))
		return false;

	if (p1 && p2)
		memcpy(p1, p2, VM_LONG(arg[2]));

	return arg[0];
}
qintptr_t VARGS Plug_memmove(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *p1 = VM_POINTER(arg[0]);
	void *p2 = VM_POINTER(arg[1]);

	if (VM_OOB(arg[0], arg[2]))
		return false;

	if (VM_OOB(arg[1], arg[2]))
		return false;

	if (p1 && p2)
		memmove(p1, p2, VM_LONG(arg[2]));

	return arg[0];
}

qintptr_t VARGS Plug_sqrt(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int ret;
	VM_FLOAT(ret) = sqrt(VM_FLOAT(arg[0]));
	return ret;
}
qintptr_t VARGS Plug_sin(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int ret;
	VM_FLOAT(ret) = sin(VM_FLOAT(arg[0]));
	return ret;
}
qintptr_t VARGS Plug_cos(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int ret;
	VM_FLOAT(ret) = cos(VM_FLOAT(arg[0]));
	return ret;
}
qintptr_t VARGS Plug_atan2(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int ret;
	VM_FLOAT(ret) = atan2(VM_FLOAT(arg[0]), VM_FLOAT(arg[1]));
	return ret;
}

void Plug_Net_Close_Internal(int handle)
{
	switch(pluginstreamarray[handle].type)
	{
	case STREAM_NONE:
		break;
	case STREAM_VFS:
		if (pluginstreamarray[handle].vfs)
			VFS_CLOSE(pluginstreamarray[handle].vfs);
		pluginstreamarray[handle].vfs = NULL;
		break;
	case STREAM_SOCKET:
#ifdef HAVE_PACKET
		closesocket(pluginstreamarray[handle].socket);
#endif
		break;
	}

	pluginstreamarray[handle].plugin = NULL;
}
qintptr_t VARGS Plug_Net_Recv(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int read;
	int handle = VM_LONG(arg[0]);
	void *dest = VM_POINTER(arg[1]);
	int destlen = VM_LONG(arg[2]);

	if (VM_OOB(arg[1], arg[2]))
		return -2;

	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
#ifdef HAVE_PACKET
	case STREAM_SOCKET:
		read = recv(pluginstreamarray[handle].socket, dest, destlen, 0);
		if (read < 0)
		{
			if (neterrno() == NET_EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (read == 0)
			return -2;	//closed by remote connection.
		return read;
#endif

	case STREAM_VFS:
		return VFS_READ(pluginstreamarray[handle].vfs, dest, destlen);
	default:
		return -2;
	}
}
qintptr_t VARGS Plug_Net_Send(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int written;
	int handle = VM_LONG(arg[0]);
	void *src = VM_POINTER(arg[1]);
	int srclen = VM_LONG(arg[2]);
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
#ifdef HAVE_PACKET
	case STREAM_SOCKET:
		written = send(pluginstreamarray[handle].socket, src, srclen, 0);
		if (written < 0)
		{
			if (neterrno() == NET_EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (written == 0)
			return -2;	//closed by remote connection.
		return written;
#endif

	case STREAM_VFS:
		return VFS_WRITE(pluginstreamarray[handle].vfs, src, srclen);

	default:
		return -2;
	}
}
qintptr_t VARGS Plug_Net_SendTo(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int written;
	int handle = VM_LONG(arg[0]);
	void *src = VM_POINTER(arg[1]);
	int srclen = VM_LONG(arg[2]);

	netadr_t *address = VM_POINTER(arg[3]);


	struct sockaddr_qstorage sockaddr;
	if (handle == -1)
	{
		NET_SendPacket(NS_CLIENT, srclen, src, address);
		return srclen;
	}

	NetadrToSockadr(address, &sockaddr);

	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;
	switch(pluginstreamarray[handle].type)
	{
#ifdef HAVE_PACKET
	case STREAM_SOCKET:
		written = sendto(pluginstreamarray[handle].socket, src, srclen, 0, (struct sockaddr*)&sockaddr, sizeof(sockaddr));
		if (written < 0)
		{
			if (neterrno() == NET_EWOULDBLOCK)
				return -1;
			else
				return -2;
		}
		else if (written == 0)
			return -2;	//closed by remote connection.
		return written;
#endif
	default:
		return -2;
	}
}
qintptr_t VARGS Plug_Net_Close(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	int handle = VM_LONG(arg[0]);
	if (handle < 0 || handle >= pluginstreamarraylen || pluginstreamarray[handle].plugin != currentplug)
		return -2;

	Plug_Net_Close_Internal(handle);
	return 0;
}

qintptr_t VARGS Plug_ReadInputBuffer(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *buffer = VM_POINTER(arg[0]);
	int bufferlen = VM_LONG(arg[1]);
	if (bufferlen > currentplug->inputbytes)
		bufferlen = currentplug->inputbytes;
	memcpy(buffer, currentplug->inputptr, currentplug->inputbytes);
	return bufferlen;
}
qintptr_t VARGS Plug_UpdateInputBuffer(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	void *buffer = VM_POINTER(arg[0]);
	int bufferlen = VM_LONG(arg[1]);
	if (bufferlen > currentplug->inputbytes)
		bufferlen = currentplug->inputbytes;
	memcpy(currentplug->inputptr, buffer, currentplug->inputbytes);
	return bufferlen;
}

#ifdef USERBE
#include "pr_common.h"
//functions useful for rigid body engines.
qintptr_t VARGS Plug_RBE_GetPluginFuncs(void *offset, quintptr_t mask, const qintptr_t *arg)
{
	static rbeplugfuncs_t funcs =
	{
		RBEPLUGFUNCS_VERSION,

		World_RegisterPhysicsEngine,
		World_UnregisterPhysicsEngine,
		World_GenerateCollisionMesh,
		World_ReleaseCollisionMesh,
		World_LinkEdict,

		VectorAngles,
		AngleVectors
	};
	if (VM_LONG(arg[0]) >= sizeof(funcs))
		return (qintptr_t)&funcs;
	else
		return 0;
}
#endif

void Plug_CloseAll_f(void);
void Plug_List_f(void);
void Plug_Close_f(void);
void Plug_Load_f(void)
{
	char *plugin;
	plugin = Cmd_Argv(1);
	if (!*plugin)
	{
		Con_Printf("Loads a plugin\n");
		Con_Printf("plug_load [pluginpath]\n");
		Con_Printf("example pluginpath: blah\n");
		Con_Printf("will load fteplug_blah"ARCH_CPU_POSTFIX ARCH_DL_POSTFIX" or $gamedir/plugins/blah.qvm\n");
		return;
	}
	if (!Plug_Load(plugin, PLUG_EITHER))
	{
		if (!Plug_Load(va("plugins/%s", plugin), PLUG_QVM))
			Con_Printf("Couldn't load plugin %s\n", Cmd_Argv(1));
	}
}
/*
static qintptr_t Test_SysCalls_Ex(void *offset, quintptr_t mask, int fn, qintptr_t *arg)
{
	switch(fn)
	{
	case 1:
		Con_Printf("%s", VM_POINTER(arg[0]));
		break;
	default:
		Con_Printf("Can't handle %i\n", fn);
	}
	return 0;
}
static int EXPORT_FN Test_SysCalls(int arg, ...)
{
	return 0;
}
void VM_Test_f(void)
{
	vm_t *vm;
	vm = VM_Create(NULL, "vm/test", com_nogamedirnativecode.ival?NULL:Test_SysCalls, Test_SysCalls_Ex);
	if (vm)
	{
		VM_Call(vm, 0, "");
		VM_Destroy(vm);
	}
}*/

void Plug_Initialise(qboolean fromgamedir)
{
	char nat[MAX_OSPATH];

	if (!numplugbuiltins)
	{
		Cvar_Register(&plug_sbar, "plugins");
		Cvar_Register(&plug_loaddefault, "plugins");
		Cmd_AddCommand("plug_closeall", Plug_CloseAll_f);
		Cmd_AddCommand("plug_close", Plug_Close_f);
		Cmd_AddCommand("plug_load", Plug_Load_f);
		Cmd_AddCommand("plug_list", Plug_List_f);

		Plug_RegisterBuiltin("Plug_GetNativePointer",	Plug_GetNativePointer, PLUG_BIF_DLLONLY);//plugin wishes to get a native interface.
		Plug_RegisterBuiltin("Plug_GetEngineFunction",	Plug_GetBuiltin, 0);//plugin wishes to find a builtin number.
		Plug_RegisterBuiltin("Plug_ExportToEngine",		Plug_ExportToEngine, 0);	//plugin has a call back that we might be interested in.
		Plug_RegisterBuiltin("Plug_ExportNative",		Plug_ExportNative, PLUG_BIF_DLLONLY);
		Plug_RegisterBuiltin("Plug_GetPluginName",		Plug_GetPluginName, 0);
		Plug_RegisterBuiltin("Con_Print",				Plug_Con_Print, 0);	//printf is not possible - qvm floats are never doubles, vararg floats in a cdecl call are always converted to doubles.
		Plug_RegisterBuiltin("Sys_Error",				Plug_Sys_Error, 0);
		Plug_RegisterBuiltin("Sys_Milliseconds",		Plug_Sys_Milliseconds, 0);
		Plug_RegisterBuiltin("Com_Error",				Plug_Sys_Error, 0);	//make zquake programmers happy.

		Plug_RegisterBuiltin("Cmd_AddCommand",			Plug_Cmd_AddCommand, 0);
		Plug_RegisterBuiltin("Cmd_Args",				Plug_Cmd_Args, 0);
		Plug_RegisterBuiltin("Cmd_Argc",				Plug_Cmd_Argc, 0);
		Plug_RegisterBuiltin("Cmd_Argv",				Plug_Cmd_Argv, 0);
		Plug_RegisterBuiltin("Cmd_AddText",				Plug_Cmd_AddText, 0);

		Plug_RegisterBuiltin("Cvar_Register",			Plug_Cvar_Register, 0);
		Plug_RegisterBuiltin("Cvar_Update",				Plug_Cvar_Update, 0);
		Plug_RegisterBuiltin("Cvar_SetString",			Plug_Cvar_SetString, 0);
		Plug_RegisterBuiltin("Cvar_SetFloat",			Plug_Cvar_SetFloat, 0);
		Plug_RegisterBuiltin("Cvar_GetString",			Plug_Cvar_GetString, 0);
		Plug_RegisterBuiltin("Cvar_GetFloat",			Plug_Cvar_GetFloat, 0);
		Plug_RegisterBuiltin("Cvar_GetNVFDG",			Plug_Cvar_GetNVFDG, PLUG_BIF_DLLONLY);

#ifdef HAVE_PACKET
		Plug_RegisterBuiltin("Net_TCPListen",			Plug_Net_TCPListen, 0);
		Plug_RegisterBuiltin("Net_Accept",				Plug_Net_Accept, 0);
		Plug_RegisterBuiltin("Net_TCPConnect",			Plug_Net_TCPConnect, 0);
#ifdef HAVE_SSL
		Plug_RegisterBuiltin("Net_SetTLSClient",		Plug_Net_SetTLSClient, 0);
#endif
		Plug_RegisterBuiltin("Net_Recv",				Plug_Net_Recv, 0);
		Plug_RegisterBuiltin("Net_Send",				Plug_Net_Send, 0);
		Plug_RegisterBuiltin("Net_SendTo",				Plug_Net_SendTo, 0);
		Plug_RegisterBuiltin("Net_Close",				Plug_Net_Close, 0);
#endif


		Plug_RegisterBuiltin("VFS_Open",				Plug_VFS_Open, PLUG_BIF_DLLONLY);
		Plug_RegisterBuiltin("FS_Open",					Plug_FS_Open, 0);
		Plug_RegisterBuiltin("FS_Read",					Plug_Net_Recv, 0);
		Plug_RegisterBuiltin("FS_Write",				Plug_Net_Send, 0);
		Plug_RegisterBuiltin("FS_Close",				Plug_Net_Close, 0);
		Plug_RegisterBuiltin("FS_Seek",					Plug_FS_Seek, 0);


		Plug_RegisterBuiltin("memset",					Plug_memset, 0);
		Plug_RegisterBuiltin("memcpy",					Plug_memcpy, 0);
		Plug_RegisterBuiltin("memmove",					Plug_memmove, 0);
		Plug_RegisterBuiltin("sqrt",					Plug_sqrt, 0);
		Plug_RegisterBuiltin("sin",						Plug_sin, 0);
		Plug_RegisterBuiltin("cos",						Plug_cos, 0);
		Plug_RegisterBuiltin("atan2",					Plug_atan2, 0);

		Plug_RegisterBuiltin("ReadInputBuffer",			Plug_ReadInputBuffer, 0);
		Plug_RegisterBuiltin("UpdateInputBuffer",		Plug_UpdateInputBuffer, 0);

		Plug_RegisterBuiltin("Sys_LoadLibrary",			Plug_Sys_LoadLibrary, PLUG_BIF_DLLONLY);
		Plug_RegisterBuiltin("Sys_CloseLibrary",		Plug_Sys_CloseLibrary, PLUG_BIF_DLLONLY);

#ifdef USERBE
		Plug_RegisterBuiltin("RBE_GetPluginFuncs",		Plug_RBE_GetPluginFuncs, PLUG_BIF_DLLONLY);
#endif

		Plug_Client_Init();
	}

	if (plug_loaddefault.value)
	{
		unsigned int u;
		if (!fromgamedir)
		{
			FS_NativePath("", FS_BINARYPATH, nat, sizeof(nat));
			Con_DPrintf("Loading plugins from \"%s\"\n", nat);
			Sys_EnumerateFiles(nat, "fteplug_*" ARCH_CPU_POSTFIX ARCH_DL_POSTFIX, Plug_EnumeratedRoot, NULL, NULL);
		}
		if (fromgamedir)
		{
			COM_EnumerateFiles("plugins/*.qvm",		Plug_Emumerated, ".qvm");
		}
		for (u = 0; staticplugins[u].name; u++)
		{
			Plug_Load(staticplugins[u].name, PLUG_NATIVE);
		}
	}
}

void Plug_Tick(void)
{
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->tick)
		{
			float rt = realtime;
			float st = 0;
#ifdef SERVERONLY 
			st = sv.time;
#elif defined(CLIENTONLY)
			st = cl.time;
#else
			st = sv.state?sv.time:cl.time;
#endif
			VM_Call(currentplug->vm, currentplug->tick, (int)(realtime*1000), *(int*)&(rt), *(int*)&(st));
		}
	}
	currentplug = oldplug;
}

#ifndef SERVERONLY
void Plug_ResChanged(void)
{
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->reschange)
			VM_Call(currentplug->vm, currentplug->reschange, vid.width, vid.height);
	}
	currentplug = oldplug;
}
#endif

qboolean Plugin_ExecuteString(void)
{
	plugin_t *oldplug = currentplug;
	if (Cmd_Argc()>0)
	{
		for (currentplug = plugs; currentplug; currentplug = currentplug->next)
		{
			if (currentplug->executestring)
			{
				if (VM_Call(currentplug->vm, currentplug->executestring, 0))
				{
					currentplug = oldplug;
					return true;
				}
			}
		}
	}
	currentplug = oldplug;
	return false;
}

#ifndef SERVERONLY
qboolean Plug_ConsoleLinkMouseOver(float x, float y, char *text, char *info)
{
	qboolean result = false;
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->consolelinkmouseover)
		{
			char buffer[2048];
			Q_strncpyz(buffer, va("\"%s\" \"%s\"", text, info), sizeof(buffer));
			Cmd_TokenizeString(buffer, false, false);
			result = VM_Call(currentplug->vm, currentplug->consolelinkmouseover, *(int*)&(x), *(int*)&(y));
			if (result)
				break;
		}
	}
	currentplug = oldplug;
	return result;
}
qboolean Plug_ConsoleLink(char *text, char *info)
{
	qboolean result = false;
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->consolelink)
		{
			char buffer[2048];
			Q_strncpyz(buffer, va("\"%s\" \"%s\"", text, info), sizeof(buffer));
			Cmd_TokenizeString(buffer, false, false);
			result = VM_Call(currentplug->vm, currentplug->consolelink);
			if (result)
				break;
		}
	}
	currentplug = oldplug;
	return result;
}

int Plug_SubConsoleCommand(console_t *con, char *line)
{
	int ret;
	char buffer[2048];
	plugin_t *oldplug = currentplug;	//shouldn't really be needed, but oh well
	currentplug = con->userdata;

	Q_strncpyz(buffer, va("\"%s\" %s", con->name, line), sizeof(buffer));
	Cmd_TokenizeString(buffer, false, false);
	ret = VM_Call(currentplug->vm, currentplug->conexecutecommand, 0);
	currentplug = oldplug;
	return ret;
}

void Plug_SpellCheckMaskedText(unsigned int *maskedstring, int maskedchars, int x, int y, int cs, int firstc, int charlimit)
{
	plugin_t *oldplug = currentplug;
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->spellcheckmaskedtext)
		{
			currentplug->inputptr = maskedstring;
			currentplug->inputbytes = sizeof(*maskedstring)*maskedchars;
			VM_Call(currentplug->vm, currentplug->spellcheckmaskedtext, x, y, cs, firstc, charlimit);
			currentplug->inputptr = NULL;
			currentplug->inputbytes = 0;
		}
	}
	currentplug = oldplug;
}
#endif

#ifndef SERVERONLY
qboolean Plug_Menu_Event(int eventtype, int param)	//eventtype = draw/keydown/keyup, param = time/key
{
	plugin_t *oc=currentplug;
	qboolean ret;

	if (!menuplug)
		return false;

	currentplug = menuplug;
	ret = VM_Call(menuplug->vm, menuplug->menufunction, eventtype, param, (int)mousecursor_x, (int)mousecursor_y);
	currentplug=oc;
	return ret;
}
#endif
#ifndef SERVERONLY
int Plug_ConnectionlessClientPacket(char *buffer, int size)
{
	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->connectionlessclientpacket)
		{
			switch (VM_Call(currentplug->vm, currentplug->connectionlessclientpacket, buffer, size, &net_from))
			{
			case 0:
				continue;	//wasn't handled
			case 1:
				currentplug = NULL;	//was handled with no apparent result
				return true;
			case 2:
#ifndef SERVERONLY
				cls.protocol = CP_PLUGIN;	//woo, the plugin wants to connect to them!
				protocolclientplugin = currentplug;
#endif
				currentplug = NULL;
				return true;
			}
		}
	}
	return false;
}
#endif
#ifndef SERVERONLY
void Plug_SBar(playerview_t *pv)
{
#ifdef QUAKEHUD
	extern qboolean sb_showscores, sb_showteamscores;
#else
#define sb_showscores 0
#define sb_showteamscores 0
#endif

	plugin_t *oc=currentplug;
	int ret;
	int cleared = false;
	int hudmode;

	if (!Sbar_ShouldDraw())
	{
		SCR_TileClear (0);
		return;
	}

	ret = 0;
	if (cl.deathmatch)
		hudmode = 1;
	else
		hudmode = 2;
	if (!(plug_sbar.ival & hudmode))
		currentplug = NULL;
	else
	{
		for (currentplug = plugs; currentplug; currentplug = currentplug->next)
		{
			if (currentplug->sbarlevel[0])
			{
				//if you don't use splitscreen, use a full videosize rect.
				R2D_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
				if (!cleared)
				{
					cleared = true;
					SCR_TileClear (0);
				}
				ret |= VM_Call(currentplug->vm, currentplug->sbarlevel[0], pv-cl.playerview, (int)r_refdef.vrect.x, (int)r_refdef.vrect.y, (int)r_refdef.vrect.width, (int)r_refdef.vrect.height, sb_showscores+sb_showteamscores*2);
				break;
			}
		}
	}
	if (!(ret & 1))
	{
		if (!cleared)
			SCR_TileClear (sb_lines);
		Sbar_Draw(pv);
	}

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->sbarlevel[1])
		{
			R2D_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
			ret |= VM_Call(currentplug->vm, currentplug->sbarlevel[1], pv-cl.playerview, r_refdef.vrect.x, r_refdef.vrect.y, r_refdef.vrect.width, r_refdef.vrect.height, sb_showscores+sb_showteamscores*2);
		}
	}

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->sbarlevel[2])
		{
			R2D_ImageColours(1, 1, 1, 1); // ensure menu colors are reset
			ret |= VM_Call(currentplug->vm, currentplug->sbarlevel[2], pv-cl.playerview, r_refdef.vrect.x, r_refdef.vrect.y, r_refdef.vrect.width, r_refdef.vrect.height, sb_showscores+sb_showteamscores*2);
		}
	}

	if (!(ret & 2) && pv == cl.playerview)
	{
		Sbar_DrawScoreboard();
	}


	currentplug = oc;
}
#endif

qboolean Plug_ServerMessage(char *buffer, int messagelevel)
{
	qboolean ret = true;

	Cmd_TokenizeString(buffer, false, false);
	Cmd_Args_Set(buffer);

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->svmsgfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->svmsgfunction, messagelevel);
		}
	}

	Cmd_Args_Set(NULL);

	return ret; // true to display message, false to supress
}

qboolean Plug_ChatMessage(char *buffer, int talkernum, int tpflags)
{
	qboolean ret = true;

	Cmd_TokenizeString(buffer, false, false);
	Cmd_Args_Set(buffer);

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->chatmsgfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->chatmsgfunction, talkernum, tpflags);
		}
	}

	Cmd_Args_Set(NULL);

	return ret; // true to display message, false to supress
}

qboolean Plug_CenterPrintMessage(char *buffer, int clientnum)
{
	qboolean ret = true;

	Cmd_TokenizeString(buffer, false, false);
	Cmd_Args_Set(buffer);

	for (currentplug = plugs; currentplug; currentplug = currentplug->next)
	{
		if (currentplug->centerprintfunction)
		{
			ret &= VM_Call(currentplug->vm, currentplug->centerprintfunction, clientnum);
		}
	}

	Cmd_Args_Set(NULL);

	return ret; // true to display message, false to supress
}

void Plug_Close(plugin_t *plug)
{
	int i;
	if (plug->blockcloses)
	{
		Con_Printf("Plugin %s provides driver features, and cannot safely be unloaded\n", plug->name);
		return;
	}
	if (plugs == plug)
		plugs = plug->next;
	else
	{
		plugin_t *prev;
		for (prev = plugs; prev; prev = prev->next)
		{
			if (prev->next == plug)
				break;
		}
		if (!prev)
			Sys_Error("Plug_Close: not linked\n");
		prev->next = plug->next;
	}

	if (!com_workererror)
		Con_DPrintf("Closing plugin %s\n", plug->name);

	//ensure any active contexts provided by the plugin are closed (stuff with destroy callbacks)
#if defined(PLUGINS) && !defined(NOMEDIA) && !defined(SERVERONLY)
	Media_UnregisterDecoder(plug, NULL);
	Media_UnregisterEncoder(plug, NULL);
#endif
	FS_UnRegisterFileSystemModule(plug);
	Mod_UnRegisterAllModelFormats(plug);

	//tell the plugin that everything is closed and that it should free up any lingering memory/stuff
	//it is still allowed to create/have open files.
	if (plug->shutdown)
	{
		plugin_t *cp = currentplug;
		currentplug = plug;
		VM_Call(plug->vm, plug->shutdown);
		currentplug = cp;
	}

	VM_Destroy(plug->vm);

	//make sure anything else that was left is unlinked (stuff without destroy callbacks).
	for (i = 0; i < pluginstreamarraylen; i++)
	{
		if (pluginstreamarray[i].plugin == plug)
		{
			Plug_Net_Close_Internal(i);
		}
	}

	Plug_FreeConCommands(plug);

	Plug_Client_Close(plug);
	Z_Free(plug);

	if (currentplug == plug)
		currentplug = NULL;
}

void Plug_Close_f(void)
{
	plugin_t *plug;
	char *name = Cmd_Argv(1);
	if (Cmd_Argc()<2)
	{
		Con_Printf("Close which plugin?\n");
		return;
	}

	if (currentplug)
		Sys_Error("Plug_CloseAll_f called inside a plugin!\n");

	for (plug = plugs; plug; plug = plug->next)
	{
		if (!strcmp(plug->name, name))
		{
			Plug_Close(plug);
			return;
		}
	}

	name = va("plugins/%s", name);
	for (plug = plugs; plug; plug = plug->next)
	{
		if (!strcmp(plug->name, name))
		{
			Plug_Close(plug);
			return;
		}
	}
	Con_Printf("Plugin %s does not appear to be loaded\n", Cmd_Argv(1));
}

void Plug_CloseAll_f(void)
{
	plugin_t *p;
	if (currentplug)
		Sys_Error("Plug_CloseAll_f called inside a plugin!\n");
	while(plugs)
	{
		p = plugs;
		while (p->blockcloses)
		{
			p = p->next;
			if (!p)
				return;
		}
		Plug_Close(p);
	}
}

void Plug_List_f(void)
{
	plugin_t *plug;
	for (plug = plugs; plug; plug = plug->next)
	{
		VM_PrintInfo(plug->vm);
	}
}

void Plug_Shutdown(qboolean preliminary)
{
	plugin_t **p;
	if (preliminary)
	{
		//close the non-block-closes plugins first, before most of the rest of the subsystems are down
		for (p = &plugs; *p; )
		{
			if ((*p)->blockcloses)
				p = &(*p)->next;
			else
				Plug_Close(*p);
		}
	}
	else
	{
		//now that our various handles etc are closed, its safe to terminate the various driver plugins.
		while(plugs)
		{
			plugs->blockcloses = 0;
			Plug_Close(plugs);
		}

		BZ_Free(pluginstreamarray);
		pluginstreamarray = NULL;
		pluginstreamarraylen = 0;

		numplugbuiltins = 0;
		BZ_Free(plugbuiltins);
		plugbuiltins = NULL;

		plugincvararraylen = 0;
		BZ_Free(plugincvararray);
		plugincvararray = NULL;

		plugincommandarraylen = 0;
		BZ_Free(plugincommandarray);
		plugincommandarray = NULL;

#ifndef SERVERONLY
		Plug_Client_Shutdown();
#endif
	}
}


//for built-in plugins
qboolean Plug_Export(const char *name, qintptr_t(QDECL *func)(qintptr_t *args))
{
	qintptr_t args[] = {(qintptr_t)name, (qintptr_t)func};
	return Plug_ExportToEngine(NULL, ~(size_t)0, args);
}
void *pPlug_GetEngineFunction(const char *funcname)
{
	return (void*)Plug_FindBuiltin(true, funcname);
}

#endif