cl_tcl.c

/*
 *  QuakeWorld embedded Tcl interpreter
 *
 *  Copyright (C) 2005 Se7en
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  $Id: cl_tcl.c,v 1.24 2007-10-04 15:11:35 borisu Exp $
 */

#ifdef WITH_TCL
#include "tcl.h"
#include <time.h>
#ifdef __FreeBSD__
#include <dlfcn.h>
#endif
#include "quakedef.h"
#include "embed_tcl.h"
#include "gl_model.h"
#include "gl_local.h"
#include "teamplay.h"
#include "rulesets.h"

extern cmd_function_t *impulse_cmd;
extern cmd_alias_t *cmd_alias;
#define ALIAS_HASHPOOL_SIZE 256
extern cmd_alias_t *cmd_alias_hash[ALIAS_HASHPOOL_SIZE];

int in_tcl;
cvar_t tcl_version = {"tcl_version", "", CVAR_ROM};

#ifdef USE_TCL_STUBS
static void* TCL_lib;
#endif
static Tcl_Interp* interp;
static Tcl_Encoding qw_enc;

static Tcl_Obj* TCL_QStringToObj (const char* src);
static Tcl_Obj* TCL_QStringToObj (const char* src);

/*
=============================================================================
 Tcl-to-QuakeWorld commands
=============================================================================
*/

static int TCL_Alias (ClientData data, Tcl_Interp* interp, int objc, Tcl_Obj *const objv[])
{
	Tcl_CmdInfo info;
	int rc;
	cmd_alias_t *a;
	const char *name, *s;
	unsigned h;

	if (objc != 4) {
		Tcl_WrongNumArgs (interp, 1, objv, "name args body");
		return (TCL_ERROR);
	}
	name = Tcl_GetString (objv[1]);

	if (strlen (name) >= MAX_ALIAS_NAME) {
		Tcl_SetResult (interp, "alias: name is too long", TCL_STATIC);
		return (TCL_ERROR);
	}

	if (Cvar_Find (name)) {
		Tcl_SetResult (interp, "alias: unable to realias cvar", TCL_STATIC);
		return (TCL_ERROR);
	}

	if (Cmd_FindCommand (name)) {
		Tcl_SetResult (interp, "alias: unable to realias command", TCL_STATIC);
		return (TCL_ERROR);
	}

	rc = Tcl_GetCommandInfo (interp, "proc", &info);
	if (!rc) {
		Tcl_SetResult (interp, "alias: unable to create Tcl proc", TCL_STATIC);
		return (TCL_ERROR);
	}

	if (info.isNativeObjectProc) {
		rc = info.objProc (info.objClientData, interp, objc, objv);
	} else {
		const char* argv[5];

		argv[0] = "proc";
		argv[1] = Tcl_GetString (objv[1]); // name
		argv[2] = Tcl_GetString (objv[2]); // args
		argv[3] = Tcl_GetString (objv[3]); // body
		argv[4] = NULL;

		rc = info.proc (info.clientData, interp, 4, argv);
	}

	if (rc != TCL_OK)
		return (rc);

	if (!Tcl_GetCommandInfo (interp, name, &info) || !info.isNativeObjectProc) {
		Tcl_SetResult (interp, "alias: unable to get reference to Tcl proc", TCL_STATIC);
		return (TCL_ERROR);
	}

	h = Com_HashKey (name) % ALIAS_HASHPOOL_SIZE;
	s = name;
	// if the alias already exists, reuse it
	for (a = cmd_alias_hash[h] ; a ; a=a->hash_next) {
		if (!strcasecmp(s, a->name)) {
			Q_free (a->value);
			a->flags = 0;
			break;
		}
	}

	// New alias
	if (!a) {
		a = (cmd_alias_t *) Q_malloc (sizeof(cmd_alias_t));
		a->next = cmd_alias;
		cmd_alias = a;
		a->hash_next = cmd_alias_hash[h];
		cmd_alias_hash[h] = a;
	}

	strlcpy (a->name, s, MAX_ALIAS_NAME);

	a->flags = ALIAS_TCL;

	if (strlen (Tcl_GetString (objv[2])))
		a->flags |= ALIAS_HAS_PARAMETERS;

	a->value = (char *) Q_malloc (sizeof (Tcl_CmdInfo));
	memcpy (a->value, &info, sizeof (Tcl_CmdInfo));

	Tcl_SetResult (interp, NULL, TCL_STATIC);

	return (TCL_OK);
}

static int TCL_Cmd (ClientData data, Tcl_Interp* interp, int objc, Tcl_Obj *const objv[])
{
	Tcl_Obj *args;
	Tcl_DString str_byte;
	char *str_utf, *line, *argv;
	int str_utf_len;
	int i;
	cbuf_t cbuf_tcl;

	if (objc < 2) {
		Tcl_WrongNumArgs (interp, 1, objv, "qw_command");
		return (TCL_ERROR);
	}

	// Get the command from TCL structures
	args = Tcl_DuplicateObj (objv[1]);
	for (i = 2; i < objc; ++i) {
		Tcl_AppendToObj (args, " ", 1);
		argv = Tcl_GetString (objv[i]);
		if (strchr (argv, ' ') && !strchr (argv, '"')) {
			// string contains spaces, so quote it
			Tcl_AppendToObj (args, "\"", 1);
			Tcl_AppendObjToObj (args, objv[i]);
			Tcl_AppendToObj (args, "\"", 1);
		} else {
			Tcl_AppendObjToObj (args, objv[i]);
		}
	}
	str_utf = Tcl_GetStringFromObj (args, &str_utf_len);
	Tcl_UtfToExternalDString (qw_enc, str_utf, str_utf_len, &str_byte);
	line = Tcl_DStringValue (&str_byte);

	// Register cbuf_tcl
	cbuf_tcl.maxsize = 1 << 11;
	cbuf_tcl.text_buf = (char *) Q_malloc (cbuf_tcl.maxsize);
	cbuf_tcl.text_start = cbuf_tcl.text_end = (cbuf_tcl.maxsize >> 1);
	cbuf_tcl.wait = false;
	cbuf_tcl.runAwayLoop = 0;

	// Execute 'line' in current command buffer
	in_tcl++;
	Cbuf_AddTextEx (&cbuf_tcl, line);
	Cbuf_ExecuteEx (&cbuf_tcl);
	in_tcl--;

	// Free memory
	Q_free (cbuf_tcl.text_buf);
	Tcl_DStringFree (&str_byte);
	Tcl_SetResult (interp, NULL, TCL_STATIC);

	return (TCL_OK);
}

static int TCL_DenyProc (ClientData data, Tcl_Interp* interp, int objc, Tcl_Obj *const objv[])
{
	char result[80];
	const char* command = Tcl_GetString (objv[0]);

	snprintf (result, 80, "Tcl command \"%s\" not allowed in Quakeworld", command);
	Tcl_SetResult (interp, result, TCL_VOLATILE);
	return (TCL_ERROR);
}


static int TCL_OpenProc (ClientData data, Tcl_Interp* interp, int objc, Tcl_Obj *const objv[])
{
	Tcl_CmdInfo *info = (Tcl_CmdInfo*) data;

	if (!info) {
		Tcl_SetResult (interp, "open: invalid builtin procedure", TCL_STATIC);
		return (TCL_ERROR);
	}

	if (objc > 1) {
		char* filename = Tcl_GetString (objv[1]);
		if (filename[0] == '|') {
			Tcl_SetResult (interp, "open: pipelines not allowed in Quakeworld", TCL_STATIC);
			return (TCL_ERROR);
		}
	}

	return (info->objProc (info->objClientData, interp, objc, objv));
}

static int TCL_ClockProc (ClientData data, Tcl_Interp* interp, int objc, Tcl_Obj *const objv[])
{
	Tcl_CmdInfo *info = (Tcl_CmdInfo*) data;

	if (!info) {
		Tcl_SetResult (interp, "clock: invalid builtin procedure", TCL_STATIC);
		return (TCL_ERROR);
	}

	if ((cl.fpd & FPD_NO_TIMERS) && objc > 1) {
		char* param = Tcl_GetString (objv[1]);
		if (param[0] == 's' && param[1] == 'e') {
			Tcl_Obj *result;
			int rc;
			time_t clock;

			rc = info->objProc (info->objClientData, interp, objc, objv);

			if (rc != TCL_OK) 
				return (rc);
			result = Tcl_GetObjResult (interp);
			if (TCL_OK != Tcl_GetLongFromObj (NULL, result, (long *) &clock))
				return (rc);

			clock -= clock % 60; // round away seconds
			Tcl_SetLongObj (result, clock);
			Tcl_SetObjResult (interp, result);

			return (TCL_OK);
		} else if (param[0] == 'c') {
			Tcl_SetResult (interp, "clock clicks disabled by FPD", TCL_STATIC);
			return (TCL_ERROR);
		}
	}

	return (info->objProc (info->objClientData, interp, objc, objv));
}


/*
=============================================================================
 QuakeWorld-to-Tcl commands
=============================================================================
*/

static void TCL_Eval_f (void)
{
	int rc;
	const char *result;
	Tcl_Obj *script;

	if (cbuf_current == &cbuf_svc) {
		Com_Printf ("%s: server not allowed to exec Tcl commands\n", Cmd_Argv(0));
		return;
	}

	if (Cmd_Argc() != 2) {
		Com_Printf ("%s <text> : evaluate text as Tcl script\n", Cmd_Argv(0));
		return;
	}
	script = TCL_QStringToObj (Cmd_Argv(1));

	rc = Tcl_EvalObjEx (interp, script, TCL_EVAL_GLOBAL);
	result = Tcl_GetStringResult (interp);
	if (rc != TCL_OK) {
		Com_Printf ("Error in Tcl script, line %i: %s\n", interp->errorLine, result ? result : "unknown");
		return;
	}
	if (result && *result) {
		Tcl_DString dst;
		char *value;

		value = Tcl_UtfToExternalDString (qw_enc, result, strlen (result), &dst);
		Com_Printf ("%s\n", value);
		Tcl_DStringFree (&dst);
	}
}

static void TCL_Exec_f (void)
{
	int rc;
	int mark;
	char filename[MAX_OSPATH];
	char *eval_buf;
	Tcl_Obj *script;
	const char *result;

	if (cbuf_current == &cbuf_svc) {
		Com_Printf ("%s: server not allowed to exec Tcl commands\n", Cmd_Argv(0));
		return;
	}

	if (Cmd_Argc() != 2) {
		Com_Printf ("%s <filename> : execute file as Tcl script\n", Cmd_Argv(0));
		return;
	}
	strlcpy (filename, Cmd_Argv(1), sizeof(filename));
	COM_DefaultExtension (filename, ".tcl");

	mark = Hunk_LowMark();
	eval_buf = (char *) FS_LoadHunkFile (filename, NULL);
	if (!eval_buf) {
		Com_Printf ("%s: unable to load %s\n", Cmd_Argv(0), filename);
		return;
	}

	script = TCL_QStringToObj (eval_buf);
	Hunk_FreeToLowMark (mark);

	rc = Tcl_EvalObjEx (interp, script, TCL_EVAL_GLOBAL);
	if (rc != TCL_OK && rc != TCL_RETURN) {
		if (developer.value)
			result = Tcl_GetVar (interp, "errorInfo", TCL_GLOBAL_ONLY);
		else
			result = Tcl_GetStringResult (interp);

		Com_Printf ("Error in Tcl script %s, line %i:\n -->%s\n", filename, interp->errorLine, result ? result : "unknown");
		return;
	}
}

static void TCL_Proc_f (void)
{
	int i;
	int argc;
	Tcl_CmdInfo info;
	int rc;
	const char *result;

	if (cbuf_current == &cbuf_svc) {
		Com_Printf ("%s: server not allowed to exec Tcl commands\n", Cmd_Argv(0));
		return;
	}

	if (Cmd_Argc() < 2) {
		Com_Printf ("tcl_proc <name> [args] : execute Tcl procedure <name>\n");
		return;
	}
	rc = Tcl_GetCommandInfo (interp, Cmd_Argv(1), &info);
	if (!rc) {
		Com_Printf ("tcl_proc: procedure %s not found\n", Cmd_Argv(1));
		return;
	}

	argc = min (Cmd_Argc()-1, 15); // FIXME: only 16 arguments accepted

	if (info.isNativeObjectProc) {
		struct Tcl_Obj* objv[17];
		for (i = 0; i < argc; ++i)
			objv[i] = TCL_QStringToObj (Cmd_Argv(i+1));
		objv[i] = NULL;

		rc = info.objProc (info.objClientData, interp, argc, objv);
	} else {
		Com_Printf ("tcl_proc: invalid Tcl proc %s\n", Cmd_Argv(1));
		return;
		/*
		char* argv[17];

		for (i = 0; i < argc; ++i)
			argv[i] = Cmd_Argv(i+1);
		argv[i] = NULL;

		rc = info.proc (info.clientData, interp, argc, argv);
		*/
	}

	if (rc != TCL_OK) {
		result = Tcl_GetStringResult (interp);
		Com_Printf ("Tcl error, line %i: %s\n", interp->errorLine, result ? result : "unknown");
		return;
	}
}

/*
=============================================================================
 Tcl internals
=============================================================================
*/

static Tcl_Obj* TCL_QStringToObj (const char* src)
{
	Tcl_Obj* obj;
	Tcl_DString str_utf;

	Tcl_ExternalToUtfDString (qw_enc, src, strlen (src), &str_utf);
	obj = Tcl_NewStringObj (Tcl_DStringValue (&str_utf), Tcl_DStringLength (&str_utf));
	Tcl_DStringFree (&str_utf);

	return (obj);
}

static char* TCL_TraceVariable (ClientData data, Tcl_Interp* interp,
		const char* name1, const char* name2, int flags)
{
	cvar_t *var;
	char *value;
	int len;

	if (name1[0] == ':' && name1[1] == ':')
		name1 += 2; // skip root namespace specification

	var = Cvar_Find (name1);

	if (flags & TCL_TRACE_READS) {
		value = var ? var->string : Cmd_MacroString((char *) name1, &len);
		if (value) {
			Tcl_DString str_utf;
			Tcl_ExternalToUtfDString (qw_enc, value, strlen (value), &str_utf);
			Tcl_SetVar2 (interp, name1, name2, Tcl_DStringValue (&str_utf), TCL_GLOBAL_ONLY);
			Tcl_DStringFree (&str_utf);
		} else {
			// QW variable no longer exists
			Tcl_UntraceVar2 (interp, name1, name2,
			                 TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS|TCL_GLOBAL_ONLY,
			                 TCL_TraceVariable, NULL);
		}
	} else if (flags & TCL_TRACE_WRITES) {
		if (var) {
			const char *value;
			Tcl_DString str_byte;
			value = Tcl_GetVar2 (interp, name1, name2, TCL_GLOBAL_ONLY);
			Tcl_UtfToExternalDString (qw_enc, value, strlen (value), &str_byte);
			Cvar_Set (var, Tcl_DStringValue (&str_byte));
			Tcl_DStringFree (&str_byte);
		} else {
			// QW variable no longer exists
			Tcl_UntraceVar2 (interp, name1, name2,
			                 TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS|TCL_GLOBAL_ONLY,
			                 TCL_TraceVariable, NULL);
		}
	} else if ((flags & TCL_TRACE_UNSETS) && !(flags && TCL_INTERP_DESTROYED)) {
		if (var && !Cvar_Delete (name1)) {
			// cvar cannot be unset, restore variable
			Tcl_DString str_utf;
			char *value = var->string;
			Tcl_ExternalToUtfDString (qw_enc, value, strlen (value), &str_utf);
			Tcl_SetVar2 (interp, name1, name2, Tcl_DStringValue (&str_utf), TCL_GLOBAL_ONLY);
			Tcl_TraceVar (interp, name1,
			              TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS|TCL_GLOBAL_ONLY,
			              TCL_TraceVariable, NULL);
			Tcl_DStringFree (&str_utf);
		}
	}
	return NULL;
}

void TCL_RegisterVariable (cvar_t *variable)
{
	int result;
	if (!interp /*|| (variable->flags & CVAR_INTERNAL)*/)
		return;

	Tcl_SetVar (interp, variable->name, variable->string, TCL_GLOBAL_ONLY);
	result = Tcl_TraceVar (interp, variable->name,
	                       TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS|TCL_GLOBAL_ONLY,
	                       TCL_TraceVariable, NULL);
}

void TCL_RegisterMacro (macro_command_t *macro)
{
	if (!interp)
		return;

	Tcl_SetVar (interp, macro->name, macro->func(), TCL_GLOBAL_ONLY);
	Tcl_TraceVar (interp, macro->name, TCL_TRACE_READS|TCL_GLOBAL_ONLY, TCL_TraceVariable, NULL);
}

void TCL_UnregisterVariable (const char *name)
{
	if (!interp)
		return;

	Tcl_UntraceVar (interp, name,
	                TCL_TRACE_READS|TCL_TRACE_WRITES|TCL_TRACE_UNSETS|TCL_GLOBAL_ONLY,
	                TCL_TraceVariable, NULL);
	Tcl_UnsetVar (interp, name, TCL_GLOBAL_ONLY);
}

void TCL_ExecuteAlias (cmd_alias_t *alias)
{
	Tcl_CmdInfo *info;
	Tcl_Obj* objv[11];
	int i, argc, rc;

	if (!interp)
		return;

	info = (Tcl_CmdInfo*) alias->value;

	objv[0] = Tcl_NewStringObj (alias->name, strlen (alias->name));

	if (alias->flags & ALIAS_HAS_PARAMETERS) {
		argc = min (Cmd_Argc(), 9);
		if (alias->name[0] == '+' || alias->name[0] == '-')
			--argc; // ignore key code
		for (i = 1; i < argc; ++i)
			objv[i] = TCL_QStringToObj (Cmd_Argv(i));
		objv[i] = NULL;
	} else {
		argc = 1;
		objv[1] = NULL;
	}

	rc = info->objProc (info->objClientData, interp, argc, objv);

	if (rc != TCL_OK) {
		const char *result = Tcl_GetStringResult (interp);
		Com_Printf ("Tcl alias error: %s\n", result);
		return;
	}
}

static void TCL_DeleteProc (ClientData data)
{
	Tcl_Free (data);
}

static void TCL_ReplaceProc (const char* command, Tcl_ObjCmdProc* proc)
{
	Tcl_CmdInfo info, *info_ptr;
	int rc;

	rc = Tcl_GetCommandInfo (interp, command, &info);
	if (!rc || !info.isNativeObjectProc) {
		Tcl_CreateObjCommand (interp, command, proc, NULL, NULL);
		return;
	}
	info_ptr = (Tcl_CmdInfo*) Tcl_Alloc (sizeof (info));
	memcpy (info_ptr, &info, sizeof (info));
	Tcl_CreateObjCommand (interp, command, proc, info_ptr, TCL_DeleteProc);
}

static int TCL_RawToUtfChars (ClientData client_data, const char *src, int src_len, int flags,
                   Tcl_EncodingState *state_ptr, char *dst, int dst_len, int *src_read_ptr,
                   int *dst_wrote_ptr, int *dst_chars_ptr)
{
	char buf[TCL_UTF_MAX];
	int utf_len = 0;
	int src_read = 0, dst_wrote = 0, dst_chars = 0;

	while (src_len && dst_len) {
		utf_len = Tcl_UniCharToUtf ((unsigned char)*src, buf);
		if (utf_len > dst_len)
			break;
		memcpy (dst, buf, utf_len);
		dst += utf_len;
		dst_len -= utf_len;
		++src;
		--src_len;
		++src_read;
		dst_wrote += utf_len;
		++dst_chars;
	}
	*src_read_ptr = src_read;
	*dst_wrote_ptr = dst_wrote;
	*dst_chars_ptr = dst_chars;

	return (src_len) ? (TCL_CONVERT_NOSPACE) : (TCL_OK);
}

static int TCL_UtfToRawChars (ClientData client_data, const char *src, int src_len, int flags,
                   Tcl_EncodingState *state_ptr, char *dst, int dst_len, int *src_read_ptr,
                   int *dst_wrote_ptr, int *dst_chars_ptr)
{
	Tcl_UniChar uni_char;
	int utf_len;
	int src_read = 0, dst_wrote = 0, dst_chars = 0;

	while (src_len && dst_len) {
		utf_len = Tcl_UtfToUniChar (src, &uni_char);
		if (utf_len > src_len)
			break;
		*dst++ = (char) (uni_char & 0xff); // just strip off hi byte
		src += utf_len;
		src_len -= utf_len;
		src_read += utf_len;
		--dst_len;
		++dst_wrote;
		++dst_chars;
	}
	*src_read_ptr = src_read;
	*dst_wrote_ptr = dst_wrote;
	*dst_chars_ptr = dst_chars;

	return (src_len) ? ((dst_len) ? (TCL_CONVERT_MULTIBYTE) : (TCL_CONVERT_NOSPACE)) : (TCL_OK);
}

void TCL_InterpInit (void)
{
	const char *version;
	static Tcl_EncodingType raw_enc = {
		"raw",				// encodingName
		TCL_RawToUtfChars,	// toUtfProc
		TCL_UtfToRawChars,	// fromUtfProc
		NULL,				// freeProc
		NULL,				// clientData
		1					// nullSize
		};

#ifdef USE_TCL_STUBS
	Tcl_Interp* (*Tcl_CreateInterpP) (void);
	void (*Tcl_FindExecutableP) (const char*);

	TCL_lib = dlopen (TCL_LIB_NAME, RTLD_NOW);
	if (!TCL_lib)
		return;

	Tcl_CreateInterpP = dlsym (TCL_lib, "Tcl_CreateInterp");
	Tcl_FindExecutableP = dlsym (TCL_lib, "Tcl_FindExecutable");

	if (!Tcl_CreateInterpP || !Tcl_FindExecutableP)
		Sys_Error ("Tcl initialization failed, probably incompatible "TCL_LIB_NAME" version\n");

	Tcl_FindExecutableP ("");
	interp = Tcl_CreateInterpP ();
#else
	Tcl_FindExecutable ("");
	interp = Tcl_CreateInterp ();
#endif

	if (!interp)
		Sys_Error ("Failed to create Tcl interpreter\n");

	version = Tcl_InitStubs (interp, TCL_VERSION, 0);
	if (!version)
		Sys_Error ("Incompatible Tcl version: %s required\n", TCL_VERSION);

	qw_enc = Tcl_CreateEncoding (&raw_enc);
	if (!qw_enc)
		Sys_Error ("Unable to initialize Tcl UTF-8 encoding\n");

	Cvar_Register (&tcl_version);
	Cvar_ForceSet (&tcl_version, (char*)version);

	Tcl_CreateObjCommand (interp, "cmd", TCL_Cmd, NULL, NULL);
	Tcl_CreateObjCommand (interp, "alias", TCL_Alias, NULL, NULL);

	TCL_InterpInitCommands();

	if (!Rulesets_RestrictTCL()) {
		TCL_ReplaceProc ("after", TCL_DenyProc); // if this may changes or invoke error sometimes, this should be disabled 
		TCL_ReplaceProc ("cd", TCL_DenyProc); // external interconnection (and qw may crash?)
		TCL_ReplaceProc ("clock", TCL_DenyProc); // disable timers
		TCL_ReplaceProc ("close", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("eof", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("exec", TCL_DenyProc); // external interconnection
		TCL_ReplaceProc ("exit", TCL_DenyProc); // use "cmd quit" (but it is not correct at this moment, crash application)
		TCL_ReplaceProc ("fblocked", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("fconfigure", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("fcopy", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("file", TCL_DenyProc); // external interconnection
		TCL_ReplaceProc ("fileevent", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("flush", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("gets", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("glob", TCL_DenyProc); // external interconnection
		TCL_ReplaceProc ("load", TCL_DenyProc); // disable lib loading with damage code
		TCL_ReplaceProc ("open", TCL_DenyProc); // disable channels + external interconnection
		TCL_ReplaceProc ("package", TCL_DenyProc); // see "load"
		TCL_ReplaceProc ("pid", TCL_DenyProc); // why do you need it?
		TCL_ReplaceProc ("puts", TCL_DenyProc); // disable channels (remote connections)
		TCL_ReplaceProc ("read", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("seek", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("socket", TCL_DenyProc); // disable channels (remote connections)
		TCL_ReplaceProc ("source", TCL_DenyProc); // external interconnection
		TCL_ReplaceProc ("tell", TCL_DenyProc); // disable channels
		TCL_ReplaceProc ("time", TCL_DenyProc); // calculate time of execution
		TCL_ReplaceProc ("update", TCL_DenyProc); // see "after"
	
		TCL_ReplaceProc ("interp", TCL_DenyProc); // ?
		TCL_ReplaceProc ("pwd", TCL_DenyProc); // if this may changes or invoke error sometimes, this should be disabled
		TCL_ReplaceProc ("trace", TCL_DenyProc); // ?
	} else {
		TCL_ReplaceProc ("exec", TCL_DenyProc);
		TCL_ReplaceProc ("load", TCL_DenyProc);
		TCL_ReplaceProc ("interp", TCL_DenyProc);
		TCL_ReplaceProc ("exit", TCL_DenyProc);
		TCL_ReplaceProc ("open", TCL_OpenProc);
		TCL_ReplaceProc ("clock", TCL_ClockProc);
	}
}

void TCL_InterpInitCommands (void)
{
	Cmd_AddCommand ("tcl_exec", TCL_Exec_f);
	Cmd_AddCommand ("tcl_eval", TCL_Eval_f);
	Cmd_AddCommand ("tcl_proc", TCL_Proc_f);
}

qbool TCL_InterpLoaded (void)
{
	return (interp != NULL);
}

void TCL_Shutdown (void)
{
	if (interp) {
		Tcl_DeleteInterp (interp);
#ifdef USE_TCL_STUBS
		dlclose (TCL_lib);
#endif

	}
}
#endif