/* ARGSUSED */
int
Tcl_FblockedObjCmd(
    ClientData unused,		/* Not used. */
    Tcl_Interp *interp,		/* Current interpreter. */
    int objc,			/* Number of arguments. */
    Tcl_Obj *const objv[])	/* Argument objects. */
{
    Tcl_Channel chan;
    int mode;

    if (objc != 2) {
	Tcl_WrongNumArgs(interp, 1, objv, "channelId");
	return TCL_ERROR;
    }

    if (TclGetChannelFromObj(interp, objv[1], &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((mode & TCL_READABLE) == 0) {
	Tcl_AppendResult(interp, "channel \"", TclGetString(objv[1]),
		"\" wasn't opened for reading", NULL);
	return TCL_ERROR;
    }

    Tcl_SetObjResult(interp, Tcl_NewBooleanObj(Tcl_InputBlocked(chan)));
    return TCL_OK;
}
Example #2
0
    /* ARGSUSED */
static void
StdinProc(
    ClientData clientData,	/* The state of interactive cmd line */
    int mask)			/* Not used. */
{
    int code, length;
    InteractiveState *isPtr = clientData;
    Tcl_Channel chan = isPtr->input;
    Tcl_Obj *commandPtr = isPtr->commandPtr;
    Tcl_Interp *interp = isPtr->interp;

    if (Tcl_IsShared(commandPtr)) {
	Tcl_DecrRefCount(commandPtr);
	commandPtr = Tcl_DuplicateObj(commandPtr);
	Tcl_IncrRefCount(commandPtr);
    }
    length = Tcl_GetsObj(chan, commandPtr);
    if (length < 0) {
	if (Tcl_InputBlocked(chan)) {
	    return;
	}
	if (isPtr->tty) {
	    /*
	     * Would be better to find a way to exit the mainLoop? Or perhaps
	     * evaluate [exit]? Leaving as is for now due to compatibility
	     * concerns.
	     */

	    Tcl_Exit(0);
	}
	Tcl_DeleteChannelHandler(chan, StdinProc, isPtr);
	return;
    }

    if (Tcl_IsShared(commandPtr)) {
	Tcl_DecrRefCount(commandPtr);
	commandPtr = Tcl_DuplicateObj(commandPtr);
	Tcl_IncrRefCount(commandPtr);
    }
    Tcl_AppendToObj(commandPtr, "\n", 1);
    if (!TclObjCommandComplete(commandPtr)) {
	isPtr->prompt = PROMPT_CONTINUE;
	goto prompt;
    }
    isPtr->prompt = PROMPT_START;
    Tcl_GetStringFromObj(commandPtr, &length);
    Tcl_SetObjLength(commandPtr, --length);

    /*
     * Disable the stdin channel handler while evaluating the command;
     * otherwise if the command re-enters the event loop we might process
     * commands from stdin before the current command is finished. Among other
     * things, this will trash the text of the command being evaluated.
     */

    Tcl_CreateChannelHandler(chan, 0, StdinProc, isPtr);
    code = Tcl_RecordAndEvalObj(interp, commandPtr, TCL_EVAL_GLOBAL);
    isPtr->input = chan = Tcl_GetStdChannel(TCL_STDIN);
    Tcl_DecrRefCount(commandPtr);
    isPtr->commandPtr = commandPtr = Tcl_NewObj();
    Tcl_IncrRefCount(commandPtr);
    if (chan != NULL) {
	Tcl_CreateChannelHandler(chan, TCL_READABLE, StdinProc, isPtr);
    }
    if (code != TCL_OK) {
	chan = Tcl_GetStdChannel(TCL_STDERR);

	if (chan != NULL) {
	    Tcl_WriteObj(chan, Tcl_GetObjResult(interp));
	    Tcl_WriteChars(chan, "\n", 1);
	}
    } else if (isPtr->tty) {
	Tcl_Obj *resultPtr = Tcl_GetObjResult(interp);
	chan = Tcl_GetStdChannel(TCL_STDOUT);

	Tcl_IncrRefCount(resultPtr);
	Tcl_GetStringFromObj(resultPtr, &length);
	if ((length > 0) && (chan != NULL)) {
	    Tcl_WriteObj(chan, resultPtr);
	    Tcl_WriteChars(chan, "\n", 1);
	}
	Tcl_DecrRefCount(resultPtr);
    }

    /*
     * If a tty stdin is still around, output a prompt.
     */

  prompt:
    if (isPtr->tty && (isPtr->input != NULL)) {
	Prompt(interp, isPtr);
	isPtr->input = Tcl_GetStdChannel(TCL_STDIN);
    }
}
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_GetsObjCmd(
    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 read from. */
    int lineLen;		/* Length of line just read. */
    int mode;			/* Mode in which channel is opened. */
    Tcl_Obj *linePtr, *chanObjPtr;

    if ((objc != 2) && (objc != 3)) {
	Tcl_WrongNumArgs(interp, 1, objv, "channelId ?varName?");
	return TCL_ERROR;
    }
    chanObjPtr = objv[1];
    if (TclGetChannelFromObj(interp, chanObjPtr, &chan, &mode, 0) != TCL_OK) {
	return TCL_ERROR;
    }
    if ((mode & TCL_READABLE) == 0) {
	Tcl_AppendResult(interp, "channel \"", TclGetString(chanObjPtr),
		"\" wasn't opened for reading", NULL);
	return TCL_ERROR;
    }

    linePtr = Tcl_NewObj();
    lineLen = Tcl_GetsObj(chan, linePtr);
    if (lineLen < 0) {
	if (!Tcl_Eof(chan) && !Tcl_InputBlocked(chan)) {
	    Tcl_DecrRefCount(linePtr);

	    /*
	     * 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.
	     */

	    if (!TclChanCaughtErrorBypass(interp, chan)) {
		Tcl_ResetResult(interp);
		Tcl_AppendResult(interp, "error reading \"",
			TclGetString(chanObjPtr), "\": ",
			Tcl_PosixError(interp), NULL);
	    }
	    return TCL_ERROR;
	}
	lineLen = -1;
    }
    if (objc == 3) {
	if (Tcl_ObjSetVar2(interp, objv[2], NULL, linePtr,
		TCL_LEAVE_ERR_MSG) == NULL) {
	    return TCL_ERROR;
	}
	Tcl_SetObjResult(interp, Tcl_NewIntObj(lineLen));
	return TCL_OK;
    } else {
	Tcl_SetObjResult(interp, linePtr);
    }
    return TCL_OK;
}
Example #5
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 #6
0
static int
TransformInputProc(
    ClientData instanceData,
    char *buf,
    int toRead,
    int *errorCodePtr)
{
    TransformChannelData *dataPtr = instanceData;
    int gotBytes, read, copied;
    Tcl_Channel downChan;

    /*
     * Should assert(dataPtr->mode & TCL_READABLE);
     */

    if (toRead == 0 || dataPtr->self == NULL) {
	/*
	 * Catch a no-op. TODO: Is this a panic()?
	 */
	return 0;
    }

    gotBytes = 0;
    downChan = Tcl_GetStackedChannel(dataPtr->self);

    PreserveData(dataPtr);
    while (toRead > 0) {
	/*
	 * Loop until the request is satisfied (or no data is available from
	 * below, possibly EOF).
	 */

	copied = ResultCopy(&dataPtr->result, UCHARP(buf), toRead);
	toRead -= copied;
	buf += copied;
	gotBytes += copied;

	if (toRead == 0) {
	    /*
	     * The request was completely satisfied from our buffers. We can
	     * break out of the loop and return to the caller.
	     */

	    break;
	}

	/*
	 * Length (dataPtr->result) == 0, toRead > 0 here. Use the incoming
	 * 'buf'! as target to store the intermediary information read from
	 * the underlying channel.
	 *
	 * Ask the tcl level how much data it allows us to read from the
	 * underlying channel. This feature allows the transform to signal EOF
	 * upstream although there is none downstream. Useful to control an
	 * unbounded 'fcopy', either through counting bytes, or by pattern
	 * matching.
	 */

	ExecuteCallback(dataPtr, NULL, A_QUERY_MAXREAD, NULL, 0,
		TRANSMIT_NUM /* -> maxRead */, P_PRESERVE);

	if (dataPtr->maxRead >= 0) {
	    if (dataPtr->maxRead < toRead) {
		toRead = dataPtr->maxRead;
	    }
	} /* else: 'maxRead < 0' == Accept the current value of toRead. */
	if (toRead <= 0) {
	    break;
	}
	if (dataPtr->eofPending) {
	    /*
	     * Already saw EOF from downChan; don't ask again.
	     * NOTE: Could move this up to avoid the last maxRead
	     * execution.  Believe this would still be correct behavior,
	     * but the test suite tests the whole command callback
	     * sequence, so leave it unchanged for now.
	     */

	    break;
	}

	/*
	 * Get bytes from the underlying channel.
	 */

	read = Tcl_ReadRaw(downChan, buf, toRead);
	if (read < 0) {
	    if (Tcl_InputBlocked(downChan) && (gotBytes > 0)) {
		/*
		 * Zero bytes available from downChan because blocked.
		 * But nonzero bytes already copied, so total is a
		 * valid blocked short read. Return to caller.
		 */

		break;
	    }

	    /*
	     * Either downChan is not blocked (there's a real error).
	     * or it is and there are no bytes copied yet.  In either
	     * case we want to pass the "error" along to the caller,
	     * either to report an error, or to signal to the caller
	     * that zero bytes are available because blocked.
	     */

	    *errorCodePtr = Tcl_GetErrno();
	    gotBytes = -1;
	    break;
	} else if (read == 0) {

	    /*
	     * Zero returned from Tcl_ReadRaw() always indicates EOF
	     * on the down channel.
	     */

	    dataPtr->eofPending = 1;
	    dataPtr->readIsFlushed = 1;
	    ExecuteCallback(dataPtr, NULL, A_FLUSH_READ, NULL, 0,
		    TRANSMIT_IBUF, P_PRESERVE);

	    if (ResultEmpty(&dataPtr->result)) {
		/*
		 * We had nothing to flush.
		 */

		break;
	    }

	    continue;		/* at: while (toRead > 0) */
	} /* read == 0 */

	/*
	 * Transform the read chunk and add the result to our read buffer
	 * (dataPtr->result).
	 */

	if (ExecuteCallback(dataPtr, NULL, A_READ, UCHARP(buf), read,
		TRANSMIT_IBUF, P_PRESERVE) != TCL_OK) {
	    *errorCodePtr = EINVAL;
	    gotBytes = -1;
	    break;
	}
    } /* while toRead > 0 */

    if (gotBytes == 0) {
	dataPtr->eofPending = 0;
    }
    ReleaseData(dataPtr);
    return gotBytes;
}