void
TclSetupEnv(
    Tcl_Interp *interp)		/* Interpreter whose "env" array is to be
				 * managed. */
{
    Tcl_DString envString;
    char *p1, *p2;
    int i;

    /*
     * Synchronize the values in the environ array with the contents of the
     * Tcl "env" variable. To do this:
     *    1) Remove the trace that fires when the "env" var is unset.
     *    2) Unset the "env" variable.
     *    3) If there are no environ variables, create an empty "env" array.
     *	     Otherwise populate the array with current values.
     *    4) Add a trace that synchronizes the "env" array.
     */

    Tcl_UntraceVar2(interp, "env", NULL,
	    TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
	    TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);

    Tcl_UnsetVar2(interp, "env", NULL, TCL_GLOBAL_ONLY);

    if (environ[0] == NULL) {
	Tcl_Obj *varNamePtr;

	TclNewLiteralStringObj(varNamePtr, "env");
	Tcl_IncrRefCount(varNamePtr);
	TclArraySet(interp, varNamePtr, NULL);
	Tcl_DecrRefCount(varNamePtr);
    } else {
	Tcl_MutexLock(&envMutex);
	for (i = 0; environ[i] != NULL; i++) {
	    p1 = Tcl_ExternalToUtfDString(NULL, environ[i], -1, &envString);
	    p2 = strchr(p1, '=');
	    if (p2 == NULL) {
		/*
		 * This condition seem to happen occasionally under some
		 * versions of Solaris, or when encoding accidents swallow the
		 * '='; ignore the entry.
		 */

		continue;
	    }
	    p2++;
	    p2[-1] = '\0';
	    Tcl_SetVar2(interp, "env", p1, p2, TCL_GLOBAL_ONLY);
	    Tcl_DStringFree(&envString);
	}
	Tcl_MutexUnlock(&envMutex);
    }

    Tcl_TraceVar2(interp, "env", NULL,
	    TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
	    TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
}
Example #2
0
static Tcl_Obj *
ObjValue(
    Link *linkPtr)		/* Structure describing linked variable. */
{
    char *p;
    Tcl_Obj *resultObj;

    switch (linkPtr->type) {
    case TCL_LINK_INT:
	linkPtr->lastValue.i = LinkedVar(int);
	return Tcl_NewIntObj(linkPtr->lastValue.i);
    case TCL_LINK_WIDE_INT:
	linkPtr->lastValue.w = LinkedVar(Tcl_WideInt);
	return Tcl_NewWideIntObj(linkPtr->lastValue.w);
    case TCL_LINK_DOUBLE:
	linkPtr->lastValue.d = LinkedVar(double);
	return Tcl_NewDoubleObj(linkPtr->lastValue.d);
    case TCL_LINK_BOOLEAN:
	linkPtr->lastValue.i = LinkedVar(int);
	return Tcl_NewBooleanObj(linkPtr->lastValue.i != 0);
    case TCL_LINK_CHAR:
	linkPtr->lastValue.c = LinkedVar(char);
	return Tcl_NewIntObj(linkPtr->lastValue.c);
    case TCL_LINK_UCHAR:
	linkPtr->lastValue.uc = LinkedVar(unsigned char);
	return Tcl_NewIntObj(linkPtr->lastValue.uc);
    case TCL_LINK_SHORT:
	linkPtr->lastValue.s = LinkedVar(short);
	return Tcl_NewIntObj(linkPtr->lastValue.s);
    case TCL_LINK_USHORT:
	linkPtr->lastValue.us = LinkedVar(unsigned short);
	return Tcl_NewIntObj(linkPtr->lastValue.us);
    case TCL_LINK_UINT:
	linkPtr->lastValue.ui = LinkedVar(unsigned int);
	return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.ui);
    case TCL_LINK_LONG:
	linkPtr->lastValue.l = LinkedVar(long);
	return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.l);
    case TCL_LINK_ULONG:
	linkPtr->lastValue.ul = LinkedVar(unsigned long);
	return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.ul);
    case TCL_LINK_FLOAT:
	linkPtr->lastValue.f = LinkedVar(float);
	return Tcl_NewDoubleObj(linkPtr->lastValue.f);
    case TCL_LINK_WIDE_UINT:
	linkPtr->lastValue.uw = LinkedVar(Tcl_WideUInt);
	/*
	 * FIXME: represent as a bignum.
	 */
	return Tcl_NewWideIntObj((Tcl_WideInt) linkPtr->lastValue.uw);
    case TCL_LINK_STRING:
	p = LinkedVar(char *);
	if (p == NULL) {
	    TclNewLiteralStringObj(resultObj, "NULL");
	    return resultObj;
	}
	return Tcl_NewStringObj(p, -1);

    /*
     * This code only gets executed if the link type is unknown (shouldn't
     * ever happen).
     */

    default:
	TclNewLiteralStringObj(resultObj, "??");
	return resultObj;
    }
}
Example #3
0
void
Tcl_MainEx(
    int argc,			/* Number of arguments. */
    TCHAR **argv,		/* Array of argument strings. */
    Tcl_AppInitProc *appInitProc,
				/* Application-specific initialization
				 * function to call after most initialization
				 * but before starting to execute commands. */
    Tcl_Interp *interp)
{
    Tcl_Obj *path, *resultPtr, *argvPtr, *appName;
    const char *encodingName = NULL;
    int code, exitCode = 0;
    Tcl_MainLoopProc *mainLoopProc;
    Tcl_Channel chan;
    InteractiveState is;

    TclpSetInitialEncodings();
    TclpFindExecutable((const char *)argv[0]);

    Tcl_InitMemory(interp);

    is.interp = interp;
    is.prompt = PROMPT_START;
    is.commandPtr = Tcl_NewObj();

    /*
     * If the application has not already set a startup script, parse the
     * first few command line arguments to determine the script path and
     * encoding.
     */

    if (NULL == Tcl_GetStartupScript(NULL)) {
	/*
	 * Check whether first 3 args (argv[1] - argv[3]) look like
	 *  -encoding ENCODING FILENAME
	 * or like
	 *  FILENAME
	 */

	if ((argc > 3) && (0 == _tcscmp(TEXT("-encoding"), argv[1]))
		&& ('-' != argv[3][0])) {
	    Tcl_Obj *value = NewNativeObj(argv[2], -1);
	    Tcl_SetStartupScript(NewNativeObj(argv[3], -1),
		    Tcl_GetString(value));
	    Tcl_DecrRefCount(value);
	    argc -= 3;
	    argv += 3;
	} else if ((argc > 1) && ('-' != argv[1][0])) {
	    Tcl_SetStartupScript(NewNativeObj(argv[1], -1), NULL);
	    argc--;
	    argv++;
	}
    }

    path = Tcl_GetStartupScript(&encodingName);
    if (path == NULL) {
	appName = NewNativeObj(argv[0], -1);
    } else {
	appName = path;
    }
    Tcl_SetVar2Ex(interp, "argv0", NULL, appName, TCL_GLOBAL_ONLY);
    argc--;
    argv++;

    Tcl_SetVar2Ex(interp, "argc", NULL, Tcl_NewIntObj(argc), TCL_GLOBAL_ONLY);

    argvPtr = Tcl_NewListObj(0, NULL);
    while (argc--) {
	Tcl_ListObjAppendElement(NULL, argvPtr, NewNativeObj(*argv++, -1));
    }
    Tcl_SetVar2Ex(interp, "argv", NULL, argvPtr, TCL_GLOBAL_ONLY);

    /*
     * Set the "tcl_interactive" variable.
     */

    is.tty = isatty(0);
    Tcl_SetVar2Ex(interp, "tcl_interactive", NULL,
	    Tcl_NewIntObj(!path && is.tty), TCL_GLOBAL_ONLY);

    /*
     * Invoke application-specific initialization.
     */

    Tcl_Preserve(interp);
    if (appInitProc(interp) != TCL_OK) {
	chan = Tcl_GetStdChannel(TCL_STDERR);
	if (chan) {
	    Tcl_WriteChars(chan,
		    "application-specific initialization failed: ", -1);
	    Tcl_WriteObj(chan, Tcl_GetObjResult(interp));
	    Tcl_WriteChars(chan, "\n", 1);
	}
    }
    if (Tcl_InterpDeleted(interp)) {
	goto done;
    }
    if (Tcl_LimitExceeded(interp)) {
	goto done;
    }
    if (TclFullFinalizationRequested()) {
	/*
	 * Arrange for final deletion of the main interp
	 */

	/* ARGH Munchhausen effect */
	Tcl_CreateExitHandler(FreeMainInterp, interp);
    }

    /*
     * Invoke the script specified on the command line, if any. Must fetch it
     * again, as the appInitProc might have reset it.
     */

    path = Tcl_GetStartupScript(&encodingName);
    if (path != NULL) {
	Tcl_ResetResult(interp);
	code = Tcl_FSEvalFileEx(interp, path, encodingName);
	if (code != TCL_OK) {
	    chan = Tcl_GetStdChannel(TCL_STDERR);
	    if (chan) {
		Tcl_Obj *options = Tcl_GetReturnOptions(interp, code);
		Tcl_Obj *keyPtr, *valuePtr;

		TclNewLiteralStringObj(keyPtr, "-errorinfo");
		Tcl_IncrRefCount(keyPtr);
		Tcl_DictObjGet(NULL, options, keyPtr, &valuePtr);
		Tcl_DecrRefCount(keyPtr);

		if (valuePtr) {
		    Tcl_WriteObj(chan, valuePtr);
		}
		Tcl_WriteChars(chan, "\n", 1);
		Tcl_DecrRefCount(options);
	    }
	    exitCode = 1;
	}
	goto done;
    }

    /*
     * We're running interactively. Source a user-specific startup file if the
     * application specified one and if the file exists.
     */

    Tcl_SourceRCFile(interp);
    if (Tcl_LimitExceeded(interp)) {
	goto done;
    }

    /*
     * Process commands from stdin until there's an end-of-file. Note that we
     * need to fetch the standard channels again after every eval, since they
     * may have been changed.
     */

    Tcl_IncrRefCount(is.commandPtr);

    /*
     * Get a new value for tty if anyone writes to ::tcl_interactive
     */

    Tcl_LinkVar(interp, "tcl_interactive", (char *) &is.tty, TCL_LINK_BOOLEAN);
    is.input = Tcl_GetStdChannel(TCL_STDIN);
    while ((is.input != NULL) && !Tcl_InterpDeleted(interp)) {
	mainLoopProc = TclGetMainLoop();
	if (mainLoopProc == NULL) {
	    int length;

	    if (is.tty) {
		Prompt(interp, &is);
		if (Tcl_InterpDeleted(interp)) {
		    break;
		}
		if (Tcl_LimitExceeded(interp)) {
		    break;
		}
		is.input = Tcl_GetStdChannel(TCL_STDIN);
		if (is.input == NULL) {
		    break;
		}
	    }
	    if (Tcl_IsShared(is.commandPtr)) {
		Tcl_DecrRefCount(is.commandPtr);
		is.commandPtr = Tcl_DuplicateObj(is.commandPtr);
		Tcl_IncrRefCount(is.commandPtr);
	    }
	    length = Tcl_GetsObj(is.input, is.commandPtr);
	    if (length < 0) {
		if (Tcl_InputBlocked(is.input)) {
		    /*
		     * This can only happen if stdin has been set to
		     * non-blocking. In that case cycle back and try again.
		     * This sets up a tight polling loop (since we have no
		     * event loop running). If this causes bad CPU hogging, we
		     * might try toggling the blocking on stdin instead.
		     */

		    continue;
		}

		/*
		 * Either EOF, or an error on stdin; we're done
		 */

		break;
	    }

	    /*
	     * Add the newline removed by Tcl_GetsObj back to the string. Have
	     * to add it back before testing completeness, because it can make
	     * a difference. [Bug 1775878]
	     */

	    if (Tcl_IsShared(is.commandPtr)) {
		Tcl_DecrRefCount(is.commandPtr);
		is.commandPtr = Tcl_DuplicateObj(is.commandPtr);
		Tcl_IncrRefCount(is.commandPtr);
	    }
	    Tcl_AppendToObj(is.commandPtr, "\n", 1);
	    if (!TclObjCommandComplete(is.commandPtr)) {
		is.prompt = PROMPT_CONTINUE;
		continue;
	    }

	    is.prompt = PROMPT_START;

	    /*
	     * The final newline is syntactically redundant, and causes some
	     * error messages troubles deeper in, so lop it back off.
	     */

	    Tcl_GetStringFromObj(is.commandPtr, &length);
	    Tcl_SetObjLength(is.commandPtr, --length);
	    code = Tcl_RecordAndEvalObj(interp, is.commandPtr,
		    TCL_EVAL_GLOBAL);
	    is.input = Tcl_GetStdChannel(TCL_STDIN);
	    Tcl_DecrRefCount(is.commandPtr);
	    is.commandPtr = Tcl_NewObj();
	    Tcl_IncrRefCount(is.commandPtr);
	    if (code != TCL_OK) {
		chan = Tcl_GetStdChannel(TCL_STDERR);
		if (chan) {
		    Tcl_WriteObj(chan, Tcl_GetObjResult(interp));
		    Tcl_WriteChars(chan, "\n", 1);
		}
	    } else if (is.tty) {
		resultPtr = Tcl_GetObjResult(interp);
		Tcl_IncrRefCount(resultPtr);
		Tcl_GetStringFromObj(resultPtr, &length);
		chan = Tcl_GetStdChannel(TCL_STDOUT);
		if ((length > 0) && chan) {
		    Tcl_WriteObj(chan, resultPtr);
		    Tcl_WriteChars(chan, "\n", 1);
		}
		Tcl_DecrRefCount(resultPtr);
	    }
	} else {	/* (mainLoopProc != NULL) */
	    /*
	     * If a main loop has been defined while running interactively, we
	     * want to start a fileevent based prompt by establishing a
	     * channel handler for stdin.
	     */

	    if (is.input) {
		if (is.tty) {
		    Prompt(interp, &is);
		}

		Tcl_CreateChannelHandler(is.input, TCL_READABLE,
			StdinProc, &is);
	    }

	    mainLoopProc();
	    Tcl_SetMainLoop(NULL);

	    if (is.input) {
		Tcl_DeleteChannelHandler(is.input, StdinProc, &is);
	    }
	    is.input = Tcl_GetStdChannel(TCL_STDIN);
	}

	/*
	 * This code here only for the (unsupported and deprecated) [checkmem]
	 * command.
	 */

#ifdef TCL_MEM_DEBUG
	if (tclMemDumpFileName != NULL) {
	    Tcl_SetMainLoop(NULL);
	    Tcl_DeleteInterp(interp);
	}
#endif /* TCL_MEM_DEBUG */
    }

  done:
    mainLoopProc = TclGetMainLoop();
    if ((exitCode == 0) && mainLoopProc && !Tcl_LimitExceeded(interp)) {
	/*
	 * If everything has gone OK so far, call the main loop proc, if it
	 * exists. Packages (like Tk) can set it to start processing events at
	 * this point.
	 */

	mainLoopProc();
	Tcl_SetMainLoop(NULL);
    }
    if (is.commandPtr != NULL) {
	Tcl_DecrRefCount(is.commandPtr);
    }

    /*
     * Rather than calling exit, invoke the "exit" command so that users can
     * replace "exit" with some other command to do additional cleanup on
     * exit. The Tcl_EvalObjEx call should never return.
     */

    if (!Tcl_InterpDeleted(interp) && !Tcl_LimitExceeded(interp)) {
	Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode);

	Tcl_IncrRefCount(cmd);
	Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL);
	Tcl_DecrRefCount(cmd);
    }

    /*
     * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual is
     * happening. Maybe interp has been deleted; maybe [exit] was redefined,
     * maybe we've blown up because of an exceeded limit. We still want to
     * cleanup and exit.
     */

    Tcl_Exit(exitCode);
}
	/* ARGSUSED */
int
Tcl_PutsObjCmd(
    ClientData dummy,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Channel chan;		/* The channel to puts on. */
    Tcl_Obj *string;		/* String to write. */
    Tcl_Obj *chanObjPtr = NULL;	/* channel object. */
    int newline;		/* Add a newline at end? */
    int result;			/* Result of puts operation. */
    int mode;			/* Mode in which channel is opened. */
    ThreadSpecificData *tsdPtr;

    switch (objc) {
    case 2: /* [puts $x] */
	string = objv[1];
	newline = 1;
	break;

    case 3: /* [puts -nonewline $x] or [puts $chan $x] */
	if (strcmp(TclGetString(objv[1]), "-nonewline") == 0) {
	    newline = 0;
	} else {
	    newline = 1;
	    chanObjPtr = objv[1];
	}
	string = objv[2];
	break;

    case 4: /* [puts -nonewline $chan $x] or [puts $chan $x nonewline] */
	if (strcmp(TclGetString(objv[1]), "-nonewline") == 0) {
	    chanObjPtr = objv[2];
	    string = objv[3];
	} else {
	    /*
	     * The code below provides backwards compatibility with an old
	     * form of the command that is no longer recommended or
	     * documented.
	     */

	    char *arg;
	    int length;

	    arg = TclGetStringFromObj(objv[3], &length);
	    if ((length != 9)
		    || (strncmp(arg, "nonewline", (size_t) length) != 0)) {
		Tcl_AppendResult(interp, "bad argument \"", arg,
			"\": should be \"nonewline\"", NULL);
		return TCL_ERROR;
	    }
	    chanObjPtr = objv[1];
	    string = objv[2];
	}
	newline = 0;
	break;

    default:
	/* [puts] or [puts some bad number of arguments...] */
	Tcl_WrongNumArgs(interp, 1, objv, "?-nonewline? ?channelId? string");
	return TCL_ERROR;
    }

    if (chanObjPtr == NULL) {
	tsdPtr = TCL_TSD_INIT(&dataKey);

	if (!tsdPtr->initialized) {
	    tsdPtr->initialized = 1;
	    TclNewLiteralStringObj(tsdPtr->stdoutObjPtr, "stdout");
	    Tcl_IncrRefCount(tsdPtr->stdoutObjPtr);
	    Tcl_CreateThreadExitHandler(FinalizeIOCmdTSD, NULL);
	}
	chanObjPtr = tsdPtr->stdoutObjPtr;
    }
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((mode & TCL_WRITABLE) == 0) {
	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
		"\" wasn't opened for writing", NULL);
	return TCL_ERROR;
    }

    result = Tcl_WriteObj(chan, string);
    if (result < 0) {
	goto error;
    }
    if (newline != 0) {
	result = Tcl_WriteChars(chan, "\n", 1);
	if (result < 0) {
	    goto error;
	}
    }
    return TCL_OK;

    /*
     * TIP #219.
     * Capture error messages put by the driver into the bypass area and put
     * them into the regular interpreter result. Fall back to the regular
     * message if nothing was found in the bypass.
     */

  error:
    if (!TclChanCaughtErrorBypass(interp, chan)) {
	Tcl_AppendResult(interp, "error writing \"",
		TclGetString(chanObjPtr), "\": ",
		Tcl_PosixError(interp), NULL);
    }
    return TCL_ERROR;
}
	/* ARGSUSED */
int
Tcl_OpenObjCmd(
    ClientData notUsed,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    int pipeline, prot;
    const char *modeString, *what;
    Tcl_Channel chan;

    if ((objc < 2) || (objc > 4)) {
	Tcl_WrongNumArgs(interp, 1, objv, "fileName ?access? ?permissions?");
	return TCL_ERROR;
    }
    prot = 0666;
    if (objc == 2) {
	modeString = "r";
    } else {
	modeString = TclGetString(objv[2]);
	if (objc == 4) {
	    char *permString = TclGetString(objv[3]);
	    int code = TCL_ERROR;
	    int scanned = TclParseAllWhiteSpace(permString, -1);

	    /* Support legacy octal numbers */
	    if ((permString[scanned] == '0')
		    && (permString[scanned+1] >= '0')
		    && (permString[scanned+1] <= '7')) {

		Tcl_Obj *permObj;

		TclNewLiteralStringObj(permObj, "0o");
		Tcl_AppendToObj(permObj, permString+scanned+1, -1);
		code = TclGetIntFromObj(NULL, permObj, &prot);
		Tcl_DecrRefCount(permObj);
	    }

	    if ((code == TCL_ERROR)
		    && TclGetIntFromObj(interp, objv[3], &prot) != TCL_OK) {
		return TCL_ERROR;
	    }
	}
    }

    pipeline = 0;
    what = TclGetString(objv[1]);
    if (what[0] == '|') {
	pipeline = 1;
    }

    /*
     * Open the file or create a process pipeline.
     */

    if (!pipeline) {
	chan = Tcl_FSOpenFileChannel(interp, objv[1], modeString, prot);
    } else {
	int mode, seekFlag, cmdObjc, binary;
	const char **cmdArgv;

	if (Tcl_SplitList(interp, what+1, &cmdObjc, &cmdArgv) != TCL_OK) {
	    return TCL_ERROR;
	}

	mode = TclGetOpenModeEx(interp, modeString, &seekFlag, &binary);
	if (mode == -1) {
	    chan = NULL;
	} else {
	    int flags = TCL_STDERR | TCL_ENFORCE_MODE;

	    switch (mode & (O_RDONLY | O_WRONLY | O_RDWR)) {
	    case O_RDONLY:
		flags |= TCL_STDOUT;
		break;
	    case O_WRONLY:
		flags |= TCL_STDIN;
		break;
	    case O_RDWR:
		flags |= (TCL_STDIN | TCL_STDOUT);
		break;
	    default:
		Tcl_Panic("Tcl_OpenCmd: invalid mode value");
		break;
	    }
	    chan = Tcl_OpenCommandChannel(interp, cmdObjc, cmdArgv, flags);
	    if (binary && chan) {
		Tcl_SetChannelOption(interp, chan, "-translation", "binary");
	    }
	}
	ckfree((char *) cmdArgv);
    }
    if (chan == NULL) {
	return TCL_ERROR;
    }
    Tcl_RegisterChannel(interp, chan);
    Tcl_AppendResult(interp, Tcl_GetChannelName(chan), NULL);
    return TCL_OK;
}
Example #6
0
int
Tcl_RecordAndEvalObj(
    Tcl_Interp *interp,		/* Token for interpreter in which command will
				 * be executed. */
    Tcl_Obj *cmdPtr,		/* Points to object holding the command to
				 * record and execute. */
    int flags)			/* Additional flags. TCL_NO_EVAL means record
				 * only: don't execute the command.
				 * TCL_EVAL_GLOBAL means evaluate the script
				 * in global variable context instead of the
				 * current procedure. */
{
    int result, call = 1;
    Tcl_Obj *list[3];
    register Tcl_Obj *objPtr;
    Tcl_CmdInfo info;

    /*
     * Do not call [history] if it has been replaced by an empty proc
     */

    result = Tcl_GetCommandInfo(interp, "history", &info);

    if (result && (info.objProc == TclObjInterpProc)) {
	Proc *procPtr = (Proc *)(info.objClientData);
	call = (procPtr->cmdPtr->compileProc != TclCompileNoOp);
    }

    if (call) {

	/*
	 * Do recording by eval'ing a tcl history command: history add $cmd. 
	 */

	TclNewLiteralStringObj(list[0], "history");
	TclNewLiteralStringObj(list[1], "add");
	list[2] = cmdPtr;
	
	objPtr = Tcl_NewListObj(3, list);
	Tcl_IncrRefCount(objPtr);
	(void) Tcl_EvalObjEx(interp, objPtr, TCL_EVAL_GLOBAL);
	Tcl_DecrRefCount(objPtr);
	
	/*
	 * One possible failure mode above: exceeding a resource limit.
	 */
	
	if (Tcl_LimitExceeded(interp)) {
	    return TCL_ERROR;
	}
    }

    /*
     * Execute the command.
     */

    result = TCL_OK;
    if (!(flags & TCL_NO_EVAL)) {
	result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL);
    }
    return result;
}
Example #7
0
void
Tcl_Main(
    int argc,			/* Number of arguments. */
    char **argv,		/* Array of argument strings. */
    Tcl_AppInitProc *appInitProc)
				/* Application-specific initialization
				 * function to call after most initialization
				 * but before starting to execute commands. */
{
    Tcl_Obj *path, *resultPtr, *argvPtr, *commandPtr = NULL;
    const char *encodingName = NULL;
    PromptType prompt = PROMPT_START;
    int code, length, tty, exitCode = 0;
    Tcl_Channel inChannel, outChannel, errChannel;
    Tcl_Interp *interp;
    Tcl_DString appName;

    Tcl_FindExecutable(argv[0]);

    interp = Tcl_CreateInterp();
    Tcl_InitMemory(interp);

    /*
     * If the application has not already set a startup script, parse the
     * first few command line arguments to determine the script path and
     * encoding.
     */

    if (NULL == Tcl_GetStartupScript(NULL)) {
	/*
	 * Check whether first 3 args (argv[1] - argv[3]) look like
	 * 	-encoding ENCODING FILENAME
	 * or like
	 * 	FILENAME
	 */

	if ((argc > 3) && (0 == strcmp("-encoding", argv[1]))
		&& ('-' != argv[3][0])) {
	    Tcl_SetStartupScript(Tcl_NewStringObj(argv[3], -1), argv[2]);
	    argc -= 3;
	    argv += 3;
	} else if ((argc > 1) && ('-' != argv[1][0])) {
	    Tcl_SetStartupScript(Tcl_NewStringObj(argv[1], -1), NULL);
	    argc--;
	    argv++;
	}
    }

    path = Tcl_GetStartupScript(&encodingName);
    if (path == NULL) {
	Tcl_ExternalToUtfDString(NULL, argv[0], -1, &appName);
    } else {
	const char *pathName = Tcl_GetStringFromObj(path, &length);

	Tcl_ExternalToUtfDString(NULL, pathName, length, &appName);
	path = Tcl_NewStringObj(Tcl_DStringValue(&appName), -1);
	Tcl_SetStartupScript(path, encodingName);
    }
    Tcl_SetVar(interp, "argv0", Tcl_DStringValue(&appName), TCL_GLOBAL_ONLY);
    Tcl_DStringFree(&appName);
    argc--;
    argv++;

    Tcl_SetVar2Ex(interp, "argc", NULL, Tcl_NewIntObj(argc), TCL_GLOBAL_ONLY);

    argvPtr = Tcl_NewListObj(0, NULL);
    while (argc--) {
	Tcl_DString ds;

	Tcl_ExternalToUtfDString(NULL, *argv++, -1, &ds);
	Tcl_ListObjAppendElement(NULL, argvPtr, Tcl_NewStringObj(
		Tcl_DStringValue(&ds), Tcl_DStringLength(&ds)));
	Tcl_DStringFree(&ds);
    }
    Tcl_SetVar2Ex(interp, "argv", NULL, argvPtr, TCL_GLOBAL_ONLY);

    /*
     * Set the "tcl_interactive" variable.
     */

    tty = isatty(0);
    Tcl_SetVar(interp, "tcl_interactive", ((path == NULL) && tty) ? "1" : "0",
	    TCL_GLOBAL_ONLY);

    /*
     * Invoke application-specific initialization.
     */

    Tcl_Preserve(interp);
    if (appInitProc(interp) != TCL_OK) {
	errChannel = Tcl_GetStdChannel(TCL_STDERR);
	if (errChannel) {
	    Tcl_WriteChars(errChannel,
		    "application-specific initialization failed: ", -1);
	    Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
	    Tcl_WriteChars(errChannel, "\n", 1);
	}
    }
    if (Tcl_InterpDeleted(interp)) {
	goto done;
    }
    if (Tcl_LimitExceeded(interp)) {
	goto done;
    }

    /*
     * If a script file was specified then just source that file and quit.
     * Must fetch it again, as the appInitProc might have reset it.
     */

    path = Tcl_GetStartupScript(&encodingName);
    if (path != NULL) {
	code = Tcl_FSEvalFileEx(interp, path, encodingName);
	if (code != TCL_OK) {
	    errChannel = Tcl_GetStdChannel(TCL_STDERR);
	    if (errChannel) {
		Tcl_Obj *options = Tcl_GetReturnOptions(interp, code);
		Tcl_Obj *keyPtr, *valuePtr;

		TclNewLiteralStringObj(keyPtr, "-errorinfo");
		Tcl_IncrRefCount(keyPtr);
		Tcl_DictObjGet(NULL, options, keyPtr, &valuePtr);
		Tcl_DecrRefCount(keyPtr);

		if (valuePtr) {
		    Tcl_WriteObj(errChannel, valuePtr);
		}
		Tcl_WriteChars(errChannel, "\n", 1);
	    }
	    exitCode = 1;
	}
	goto done;
    }

    /*
     * We're running interactively. Source a user-specific startup file if the
     * application specified one and if the file exists.
     */

    Tcl_SourceRCFile(interp);
    if (Tcl_LimitExceeded(interp)) {
	goto done;
    }

    /*
     * Process commands from stdin until there's an end-of-file. Note that we
     * need to fetch the standard channels again after every eval, since they
     * may have been changed.
     */

    commandPtr = Tcl_NewObj();
    Tcl_IncrRefCount(commandPtr);

    /*
     * Get a new value for tty if anyone writes to ::tcl_interactive
     */

    Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty, TCL_LINK_BOOLEAN);
    inChannel = Tcl_GetStdChannel(TCL_STDIN);
    outChannel = Tcl_GetStdChannel(TCL_STDOUT);
    while ((inChannel != NULL) && !Tcl_InterpDeleted(interp)) {
	if (mainLoopProc == NULL) {
	    if (tty) {
		Prompt(interp, &prompt);
		if (Tcl_InterpDeleted(interp)) {
		    break;
		}
		if (Tcl_LimitExceeded(interp)) {
		    break;
		}
		inChannel = Tcl_GetStdChannel(TCL_STDIN);
		if (inChannel == NULL) {
		    break;
		}
	    }
	    if (Tcl_IsShared(commandPtr)) {
		Tcl_DecrRefCount(commandPtr);
		commandPtr = Tcl_DuplicateObj(commandPtr);
		Tcl_IncrRefCount(commandPtr);
	    }
	    length = Tcl_GetsObj(inChannel, commandPtr);
	    if (length < 0) {
		if (Tcl_InputBlocked(inChannel)) {
		    /*
		     * This can only happen if stdin has been set to
		     * non-blocking. In that case cycle back and try again.
		     * This sets up a tight polling loop (since we have no
		     * event loop running). If this causes bad CPU hogging, we
		     * might try toggling the blocking on stdin instead.
		     */

		    continue;
		}

		/*
		 * Either EOF, or an error on stdin; we're done
		 */

		break;
	    }

	    /*
	     * Add the newline removed by Tcl_GetsObj back to the string. Have
	     * to add it back before testing completeness, because it can make
	     * a difference. [Bug 1775878]
	     */

	    if (Tcl_IsShared(commandPtr)) {
		Tcl_DecrRefCount(commandPtr);
		commandPtr = Tcl_DuplicateObj(commandPtr);
		Tcl_IncrRefCount(commandPtr);
	    }
	    Tcl_AppendToObj(commandPtr, "\n", 1);
	    if (!TclObjCommandComplete(commandPtr)) {
		prompt = PROMPT_CONTINUE;
		continue;
	    }

	    prompt = PROMPT_START;

	    /*
	     * The final newline is syntactically redundant, and causes some
	     * error messages troubles deeper in, so lop it back off.
	     */

	    Tcl_GetStringFromObj(commandPtr, &length);
	    Tcl_SetObjLength(commandPtr, --length);
	    code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL);
	    inChannel = Tcl_GetStdChannel(TCL_STDIN);
	    outChannel = Tcl_GetStdChannel(TCL_STDOUT);
	    errChannel = Tcl_GetStdChannel(TCL_STDERR);
	    Tcl_DecrRefCount(commandPtr);
	    commandPtr = Tcl_NewObj();
	    Tcl_IncrRefCount(commandPtr);
	    if (code != TCL_OK) {
		if (errChannel) {
		    Tcl_WriteObj(errChannel, Tcl_GetObjResult(interp));
		    Tcl_WriteChars(errChannel, "\n", 1);
		}
 	    } else if (tty) {
		resultPtr = Tcl_GetObjResult(interp);
		Tcl_IncrRefCount(resultPtr);
		Tcl_GetStringFromObj(resultPtr, &length);
		if ((length > 0) && outChannel) {
		    Tcl_WriteObj(outChannel, resultPtr);
		    Tcl_WriteChars(outChannel, "\n", 1);
		}
		Tcl_DecrRefCount(resultPtr);
	    }
	} else {	/* (mainLoopProc != NULL) */
	    /*
	     * If a main loop has been defined while running interactively, we
	     * want to start a fileevent based prompt by establishing a
	     * channel handler for stdin.
	     */

	    InteractiveState *isPtr = NULL;

	    if (inChannel) {
		if (tty) {
		    Prompt(interp, &prompt);
		}
		isPtr = (InteractiveState *)
			ckalloc(sizeof(InteractiveState));
		isPtr->input = inChannel;
		isPtr->tty = tty;
		isPtr->commandPtr = commandPtr;
		isPtr->prompt = prompt;
		isPtr->interp = interp;

		Tcl_UnlinkVar(interp, "tcl_interactive");
		Tcl_LinkVar(interp, "tcl_interactive", (char *) &(isPtr->tty),
			TCL_LINK_BOOLEAN);

		Tcl_CreateChannelHandler(inChannel, TCL_READABLE, StdinProc,
			isPtr);
	    }

	    mainLoopProc();
	    mainLoopProc = NULL;

	    if (inChannel) {
		tty = isPtr->tty;
		Tcl_UnlinkVar(interp, "tcl_interactive");
		Tcl_LinkVar(interp, "tcl_interactive", (char *) &tty,
			TCL_LINK_BOOLEAN);
		prompt = isPtr->prompt;
		commandPtr = isPtr->commandPtr;
		if (isPtr->input != NULL) {
		    Tcl_DeleteChannelHandler(isPtr->input, StdinProc, isPtr);
		}
		ckfree((char *) isPtr);
	    }
	    inChannel = Tcl_GetStdChannel(TCL_STDIN);
	    outChannel = Tcl_GetStdChannel(TCL_STDOUT);
	    errChannel = Tcl_GetStdChannel(TCL_STDERR);
	}
#ifdef TCL_MEM_DEBUG

	/*
	 * This code here only for the (unsupported and deprecated) [checkmem]
	 * command.
	 */

	if (tclMemDumpFileName != NULL) {
	    mainLoopProc = NULL;
	    Tcl_DeleteInterp(interp);
	}
#endif
    }

  done:
    if ((exitCode == 0) && (mainLoopProc != NULL)
	    && !Tcl_LimitExceeded(interp)) {
	/*
	 * If everything has gone OK so far, call the main loop proc, if it
	 * exists. Packages (like Tk) can set it to start processing events at
	 * this point.
	 */

	mainLoopProc();
	mainLoopProc = NULL;
    }
    if (commandPtr != NULL) {
	Tcl_DecrRefCount(commandPtr);
    }

    /*
     * Rather than calling exit, invoke the "exit" command so that users can
     * replace "exit" with some other command to do additional cleanup on
     * exit. The Tcl_EvalObjEx call should never return.
     */

    if (!Tcl_InterpDeleted(interp)) {
	if (!Tcl_LimitExceeded(interp)) {
	    Tcl_Obj *cmd = Tcl_ObjPrintf("exit %d", exitCode);

	    Tcl_IncrRefCount(cmd);
	    Tcl_EvalObjEx(interp, cmd, TCL_EVAL_GLOBAL);
	    Tcl_DecrRefCount(cmd);
	}

	/*
	 * If Tcl_EvalObjEx returns, trying to eval [exit], something unusual
	 * is happening. Maybe interp has been deleted; maybe [exit] was
	 * redefined, maybe we've blown up because of an exceeded limit. We
	 * still want to cleanup and exit.
	 */

	if (!Tcl_InterpDeleted(interp)) {
	    Tcl_DeleteInterp(interp);
	}
    }
    Tcl_SetStartupScript(NULL, NULL);

    /*
     * If we get here, the master interp has been deleted. Allow its
     * destruction with the last matching Tcl_Release.
     */

    Tcl_Release(interp);
    Tcl_Exit(exitCode);
}
Example #8
0
File: tclFCmd.c Project: smh377/tcl
static int
CopyRenameOneFile(
    Tcl_Interp *interp,		/* Used for error reporting. */
    Tcl_Obj *source,		/* Pathname of file to copy. May need to be
				 * translated. */
    Tcl_Obj *target,		/* Pathname of file to create/overwrite. May
				 * need to be translated. */
    int copyFlag,		/* If non-zero, copy files. Otherwise, rename
				 * them. */
    int force)			/* If non-zero, overwrite target file if it
				 * exists. Otherwise, error if target already
				 * exists. */
{
    int result;
    Tcl_Obj *errfile, *errorBuffer;
    Tcl_Obj *actualSource=NULL;	/* If source is a link, then this is the real
				 * file/directory. */
    Tcl_StatBuf sourceStatBuf, targetStatBuf;

    if (Tcl_FSConvertToPathType(interp, source) != TCL_OK) {
	return TCL_ERROR;
    }
    if (Tcl_FSConvertToPathType(interp, target) != TCL_OK) {
	return TCL_ERROR;
    }

    errfile = NULL;
    errorBuffer = NULL;
    result = TCL_ERROR;

    /*
     * We want to copy/rename links and not the files they point to, so we use
     * lstat(). If target is a link, we also want to replace the link and not
     * the file it points to, so we also use lstat() on the target.
     */

    if (Tcl_FSLstat(source, &sourceStatBuf) != 0) {
	errfile = source;
	goto done;
    }
    if (Tcl_FSLstat(target, &targetStatBuf) != 0) {
	if (errno != ENOENT) {
	    errfile = target;
	    goto done;
	}
    } else {
	if (force == 0) {
	    errno = EEXIST;
	    errfile = target;
	    goto done;
	}

	/*
	 * Prevent copying or renaming a file onto itself. On Windows since
	 * 8.5 we do get an inode number, however the unsigned short field is
	 * insufficient to accept the Win32 API file id so it is truncated to
	 * 16 bits and we get collisions. See bug #2015723.
	 */

#if !defined(_WIN32) && !defined(__CYGWIN__)
	if ((sourceStatBuf.st_ino != 0) && (targetStatBuf.st_ino != 0)) {
	    if ((sourceStatBuf.st_ino == targetStatBuf.st_ino) &&
		    (sourceStatBuf.st_dev == targetStatBuf.st_dev)) {
		result = TCL_OK;
		goto done;
	    }
	}
#endif

	/*
	 * Prevent copying/renaming a file onto a directory and vice-versa.
	 * This is a policy decision based on the fact that existing
	 * implementations of copy and rename on all platforms also prevent
	 * this.
	 */

	if (S_ISDIR(sourceStatBuf.st_mode)
		&& !S_ISDIR(targetStatBuf.st_mode)) {
	    errno = EISDIR;
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "can't overwrite file \"%s\" with directory \"%s\"",
		    TclGetString(target), TclGetString(source)));
	    goto done;
	}
	if (!S_ISDIR(sourceStatBuf.st_mode)
		&& S_ISDIR(targetStatBuf.st_mode)) {
	    errno = EISDIR;
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "can't overwrite directory \"%s\" with file \"%s\"",
		    TclGetString(target), TclGetString(source)));
	    goto done;
	}

	/*
	 * The destination exists, but appears to be ok to over-write, and
	 * -force is given. We now try to adjust permissions to ensure the
	 * operation succeeds. If we can't adjust permissions, we'll let the
	 * actual copy/rename return an error later.
	 */

	{
	    Tcl_Obj *perm;
	    int index;

	    TclNewLiteralStringObj(perm, "u+w");
	    Tcl_IncrRefCount(perm);
	    if (TclFSFileAttrIndex(target, "-permissions", &index) == TCL_OK) {
		Tcl_FSFileAttrsSet(NULL, index, target, perm);
	    }
	    Tcl_DecrRefCount(perm);
	}
    }

    if (copyFlag == 0) {
	result = Tcl_FSRenameFile(source, target);
	if (result == TCL_OK) {
	    goto done;
	}

	if (errno == EINVAL) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error renaming \"%s\" to \"%s\": trying to rename a"
		    " volume or move a directory into itself",
		    TclGetString(source), TclGetString(target)));
	    goto done;
	} else if (errno != EXDEV) {
	    errfile = target;
	    goto done;
	}

	/*
	 * The rename failed because the move was across file systems. Fall
	 * through to copy file and then remove original. Note that the
	 * low-level Tcl_FSRenameFileProc in the filesystem is allowed to
	 * implement cross-filesystem moves itself, if it desires.
	 */
    }

    actualSource = source;
    Tcl_IncrRefCount(actualSource);

    /*
     * Activate the following block to copy files instead of links. However
     * Tcl's semantics currently say we should copy links, so any such change
     * should be the subject of careful study on the consequences.
     *
     * Perhaps there could be an optional flag to 'file copy' to dictate which
     * approach to use, with the default being _not_ to have this block
     * active.
     */

#if 0
#ifdef S_ISLNK
    if (copyFlag && S_ISLNK(sourceStatBuf.st_mode)) {
	/*
	 * We want to copy files not links. Therefore we must follow the link.
	 * There are two purposes to this 'stat' call here. First we want to
	 * know if the linked-file/dir actually exists, and second, in the
	 * block of code which follows, some 20 lines down, we want to check
	 * if the thing is a file or directory.
	 */

	if (Tcl_FSStat(source, &sourceStatBuf) != 0) {
	    /*
	     * Actual file doesn't exist.
	     */

	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
		    "error copying \"%s\": the target of this link doesn't"
		    " exist", TclGetString(source)));
	    goto done;
	} else {
	    int counter = 0;

	    while (1) {
		Tcl_Obj *path = Tcl_FSLink(actualSource, NULL, 0);
		if (path == NULL) {
		    break;
		}

		/*
		 * Now we want to check if this is a relative path, and if so,
		 * to make it absolute.
		 */

		if (Tcl_FSGetPathType(path) == TCL_PATH_RELATIVE) {
		    Tcl_Obj *abs = Tcl_FSJoinToPath(actualSource, 1, &path);

		    if (abs == NULL) {
			break;
		    }
		    Tcl_IncrRefCount(abs);
		    Tcl_DecrRefCount(path);
		    path = abs;
		}
		Tcl_DecrRefCount(actualSource);
		actualSource = path;
		counter++;

		/*
		 * Arbitrary limit of 20 links to follow.
		 */

		if (counter > 20) {
		    /*
		     * Too many links.
		     */

		    Tcl_SetErrno(EMLINK);
		    errfile = source;
		    goto done;
		}
	    }
	    /* Now 'actualSource' is the correct file */
	}
    }
#endif /* S_ISLNK */
#endif

    if (S_ISDIR(sourceStatBuf.st_mode)) {
	result = Tcl_FSCopyDirectory(actualSource, target, &errorBuffer);
	if (result != TCL_OK) {
	    if (errno == EXDEV) {
		/*
		 * The copy failed because we're trying to do a
		 * cross-filesystem copy. We do this through our Tcl library.
		 */

		Tcl_Obj *copyCommand, *cmdObj, *opObj;

		TclNewObj(copyCommand);
		TclNewLiteralStringObj(cmdObj, "::tcl::CopyDirectory");
		Tcl_ListObjAppendElement(interp, copyCommand, cmdObj);
		if (copyFlag) {
		    TclNewLiteralStringObj(opObj, "copying");
		} else {
		    TclNewLiteralStringObj(opObj, "renaming");
		}
		Tcl_ListObjAppendElement(interp, copyCommand, opObj);
		Tcl_ListObjAppendElement(interp, copyCommand, source);
		Tcl_ListObjAppendElement(interp, copyCommand, target);
		Tcl_IncrRefCount(copyCommand);
		result = Tcl_EvalObjEx(interp, copyCommand,
			TCL_EVAL_GLOBAL | TCL_EVAL_DIRECT);
		Tcl_DecrRefCount(copyCommand);
		if (result != TCL_OK) {
		    /*
		     * There was an error in the Tcl-level copy. We will pass
		     * on the Tcl error message and can ensure this by setting
		     * errfile to NULL
		     */

		    errfile = NULL;
		}
	    } else {
		errfile = errorBuffer;
		if (Tcl_FSEqualPaths(errfile, source)) {
		    errfile = source;
		} else if (Tcl_FSEqualPaths(errfile, target)) {
		    errfile = target;
		}
	    }
	}
    } else {
	result = Tcl_FSCopyFile(actualSource, target);
	if ((result != TCL_OK) && (errno == EXDEV)) {
	    result = TclCrossFilesystemCopy(interp, source, target);
	}
	if (result != TCL_OK) {
	    /*
	     * We could examine 'errno' to double-check if the problem was
	     * with the target, but we checked the source above, so it should
	     * be quite clear
	     */

	    errfile = target;
	}
	/*
	 * We now need to reset the result, because the above call,
	 * may have left set it.  (Ideally we would prefer not to pass
	 * an interpreter in above, but the channel IO code used by
	 * TclCrossFilesystemCopy currently requires one)
	 */
	Tcl_ResetResult(interp);
    }
    if ((copyFlag == 0) && (result == TCL_OK)) {
	if (S_ISDIR(sourceStatBuf.st_mode)) {
	    result = Tcl_FSRemoveDirectory(source, 1, &errorBuffer);
	    if (result != TCL_OK) {
		errfile = errorBuffer;
		if (Tcl_FSEqualPaths(errfile, source) == 0) {
		    errfile = source;
		}
	    }
	} else {
	    result = Tcl_FSDeleteFile(source);
	    if (result != TCL_OK) {
		errfile = source;
	    }
	}
	if (result != TCL_OK) {
	    Tcl_SetObjResult(interp, Tcl_ObjPrintf("can't unlink \"%s\": %s",
		    TclGetString(errfile), Tcl_PosixError(interp)));
	    errfile = NULL;
	}
    }

  done:
    if (errfile != NULL) {
	Tcl_Obj *errorMsg = Tcl_ObjPrintf("error %s \"%s\"",
		(copyFlag ? "copying" : "renaming"), TclGetString(source));

	if (errfile != source) {
	    Tcl_AppendPrintfToObj(errorMsg, " to \"%s\"",
		    TclGetString(target));
	    if (errfile != target) {
		Tcl_AppendPrintfToObj(errorMsg, ": \"%s\"",
			TclGetString(errfile));
	    }
	}
	Tcl_AppendPrintfToObj(errorMsg, ": %s", Tcl_PosixError(interp));
	Tcl_SetObjResult(interp, errorMsg);
    }
    if (errorBuffer != NULL) {
	Tcl_DecrRefCount(errorBuffer);
    }
    if (actualSource != NULL) {
	Tcl_DecrRefCount(actualSource);
    }
    return result;
}
Example #9
0
void
TclSetupEnv(
    Tcl_Interp *interp)		/* Interpreter whose "env" array is to be
				 * managed. */
{
    Var *varPtr, *arrayPtr;
    Tcl_Obj *varNamePtr;
    Tcl_DString envString;
    Tcl_HashTable namesHash;
    Tcl_HashEntry *hPtr;
    Tcl_HashSearch search;

    /*
     * Synchronize the values in the environ array with the contents of the
     * Tcl "env" variable. To do this:
     *    1) Remove the trace that fires when the "env" var is updated.
     *    2) Find the existing contents of the "env", storing in a hash table.
     *    3) Create/update elements for each environ variable, removing
     *	     elements from the hash table as we go.
     *    4) Remove the elements for each remaining entry in the hash table,
     *	     which must have existed before yet have no analog in the environ
     *	     variable.
     *    5) Add a trace that synchronizes the "env" array.
     */

    Tcl_UntraceVar2(interp, "env", NULL,
	    TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
	    TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);

    /*
     * Find out what elements are currently in the global env array.
     */

    TclNewLiteralStringObj(varNamePtr, "env");
    Tcl_IncrRefCount(varNamePtr);
    Tcl_InitObjHashTable(&namesHash);
    varPtr = TclObjLookupVarEx(interp, varNamePtr, NULL, TCL_GLOBAL_ONLY,
	    /*msg*/ 0, /*createPart1*/ 0, /*createPart2*/ 0, &arrayPtr);
    TclFindArrayPtrElements(varPtr, &namesHash);

    /*
     * Go through the environment array and transfer its values into Tcl. At
     * the same time, remove those elements we add/update from the hash table
     * of existing elements, so that after this part processes, that table
     * will hold just the parts to remove.
     */

    if (environ[0] != NULL) {
	int i;

	Tcl_MutexLock(&envMutex);
	for (i = 0; environ[i] != NULL; i++) {
	    Tcl_Obj *obj1, *obj2;
	    char *p1, *p2;

	    p1 = Tcl_ExternalToUtfDString(NULL, environ[i], -1, &envString);
	    p2 = strchr(p1, '=');
	    if (p2 == NULL) {
		/*
		 * This condition seem to happen occasionally under some
		 * versions of Solaris, or when encoding accidents swallow the
		 * '='; ignore the entry.
		 */

		continue;
	    }
	    p2++;
	    p2[-1] = '\0';
	    obj1 = Tcl_NewStringObj(p1, -1);
	    obj2 = Tcl_NewStringObj(p2, -1);
	    Tcl_DStringFree(&envString);

	    Tcl_IncrRefCount(obj1);
	    Tcl_IncrRefCount(obj2);
	    Tcl_ObjSetVar2(interp, varNamePtr, obj1, obj2, TCL_GLOBAL_ONLY);
	    hPtr = Tcl_FindHashEntry(&namesHash, obj1);
	    if (hPtr != NULL) {
		Tcl_DeleteHashEntry(hPtr);
	    }
	    Tcl_DecrRefCount(obj1);
	    Tcl_DecrRefCount(obj2);
	}
	Tcl_MutexUnlock(&envMutex);
    }

    /*
     * Delete those elements that existed in the array but which had no
     * counterparts in the environment array.
     */

    for (hPtr=Tcl_FirstHashEntry(&namesHash, &search); hPtr!=NULL;
	    hPtr=Tcl_NextHashEntry(&search)) {
	Tcl_Obj *elemName = Tcl_GetHashValue(hPtr);

	TclObjUnsetVar2(interp, varNamePtr, elemName, TCL_GLOBAL_ONLY);
    }
    Tcl_DeleteHashTable(&namesHash);
    Tcl_DecrRefCount(varNamePtr);

    /*
     * Re-establish the trace.
     */

    Tcl_TraceVar2(interp, "env", NULL,
	    TCL_GLOBAL_ONLY | TCL_TRACE_WRITES | TCL_TRACE_UNSETS |
	    TCL_TRACE_READS | TCL_TRACE_ARRAY, EnvTraceProc, NULL);
}
Example #10
0
int
Tcl_RecordAndEvalObj(
    Tcl_Interp *interp,		/* Token for interpreter in which command will
				 * be executed. */
    Tcl_Obj *cmdPtr,		/* Points to object holding the command to
				 * record and execute. */
    int flags)			/* Additional flags. TCL_NO_EVAL means record
				 * only: don't execute the command.
				 * TCL_EVAL_GLOBAL means evaluate the script
				 * in global variable context instead of the
				 * current procedure. */
{
    int result, call = 1;
    Tcl_CmdInfo info;
    HistoryObjs *histObjsPtr =
	    Tcl_GetAssocData(interp, HISTORY_OBJS_KEY, NULL);

    /*
     * Create the references to the [::history add] command if necessary.
     */

    if (histObjsPtr == NULL) {
	histObjsPtr = Tcl_Alloc(sizeof(HistoryObjs));
	TclNewLiteralStringObj(histObjsPtr->historyObj, "::history");
	TclNewLiteralStringObj(histObjsPtr->addObj, "add");
	Tcl_IncrRefCount(histObjsPtr->historyObj);
	Tcl_IncrRefCount(histObjsPtr->addObj);
	Tcl_SetAssocData(interp, HISTORY_OBJS_KEY, DeleteHistoryObjs,
		histObjsPtr);
    }

    /*
     * Do not call [history] if it has been replaced by an empty proc
     */

    result = Tcl_GetCommandInfo(interp, "::history", &info);
    if (result && (info.deleteProc == TclProcDeleteProc)) {
	Proc *procPtr = (Proc *) info.objClientData;
	call = (procPtr->cmdPtr->compileProc != TclCompileNoOp);
    }

    if (call) {
	Tcl_Obj *list[3];

	/*
	 * Do recording by eval'ing a tcl history command: history add $cmd.
	 */

	list[0] = histObjsPtr->historyObj;
	list[1] = histObjsPtr->addObj;
	list[2] = cmdPtr;

	Tcl_IncrRefCount(cmdPtr);
	(void) Tcl_EvalObjv(interp, 3, list, TCL_EVAL_GLOBAL);
	Tcl_DecrRefCount(cmdPtr);

	/*
	 * One possible failure mode above: exceeding a resource limit.
	 */

	if (Tcl_LimitExceeded(interp)) {
	    return TCL_ERROR;
	}
    }

    /*
     * Execute the command.
     */

    result = TCL_OK;
    if (!(flags & TCL_NO_EVAL)) {
	result = Tcl_EvalObjEx(interp, cmdPtr, flags & TCL_EVAL_GLOBAL);
    }
    return result;
}