Tcl Source Code

2011-03-17  Donal K. Fellows  <[email protected]>

	* generic/tclCompExpr.c (ParseExpr): Generate errorCode information on
	failure to parse expressions.

2011-03-17  Jan Nijtmans  <[email protected]>

	* generic/tkMain.c: [Patch 3124683]: Reorganize the platform-specific
	stuff in (tcl|tk)Main.c.

2011-03-16  Jan Nijtmans  <[email protected]>

	* generic/tclCkalloc.c: [Bug 3197864]: Pointer truncation on Win64
	TCL_MEM_DEBUG builds.

2011-03-16  Don Porter  <[email protected]>

	* generic/tclBasic.c:	Some rewrites to eliminate calls to
	* generic/tclParse.c:	isspace() and their /* INTL */ risk.
	* generic/tclProc.c:

2011-03-16  Jan Nijtmans  <[email protected]>

	* unix/tcl.m4:    Make SHLIB_LD_LIBS='${LIBS}' the default and
	* unix/configure: set to "" on per-platform necessary basis.
	Backported from TEA, but kept all original platform code which was
	removed from TEA.

    if (type == TCL_NUMBER_LONG) {
	long l = *((const long *) ptr);

	if (l > (long)0) {
	    goto unChanged;
	} else if (l == (long)0) {
	    const char *string = objv[1]->bytes;

	    if (string) {
		while (*string != '0') {
		    if (*string == '-') {
			Tcl_SetObjResult(interp, Tcl_NewLongObj(0));


			return TCL_OK;

		    }

		    string++;
		}


	    }
	    goto unChanged;
	} else if (l == LONG_MIN) {
	    TclBNInitBignumFromLong(&big, l);
	    goto tooLarge;
	}
	Tcl_SetObjResult(interp, Tcl_NewLongObj(-l));
	return TCL_OK;
    }

/*
 * The following macro computes the offset of the "body" field within
 * mem_header. It is used to get back to the header pointer from the body
 * pointer that's used by clients.
 */

#define BODY_OFFSET \
	((size_t) (&((struct mem_header *) 0)->body))

static int total_mallocs = 0;
static int total_frees = 0;
static size_t current_bytes_malloced = 0;
static size_t maximum_bytes_malloced = 0;
static int current_malloc_packets = 0;
static int maximum_malloc_packets = 0;

     * The following cast is *very* tricky. Must convert the pointer to an
     * integer before doing arithmetic on it, because otherwise the arithmetic
     * will be done differently (and incorrectly) on word-addressed machines
     * such as Crays (will subtract only bytes, even though BODY_OFFSET is in
     * words on these machines).
     */

    memp = (struct mem_header *) (((size_t) ptr) - BODY_OFFSET);

    if (alloc_tracing) {
	fprintf(stderr, "ckfree %lx %ld %s %d\n",
		(long unsigned int) memp->body, memp->length, file, line);
    }

    if (validate_memory) {

	return Tcl_DbCkalloc(size, file, line);
    }

    /*
     * See comment from Tcl_DbCkfree before you change the following line.
     */

    memp = (struct mem_header *) (((size_t) ptr) - BODY_OFFSET);

    copySize = size;
    if (copySize > (unsigned int) memp->length) {
	copySize = memp->length;
    }
    newPtr = Tcl_DbCkalloc(size, file, line);
    memcpy(newPtr, ptr, (size_t) copySize);

	return Tcl_AttemptDbCkalloc(size, file, line);
    }

    /*
     * See comment from Tcl_DbCkfree before you change the following line.
     */

    memp = (struct mem_header *) (((size_t) ptr) - BODY_OFFSET);

    copySize = size;
    if (copySize > (unsigned int) memp->length) {
	copySize = memp->length;
    }
    newPtr = Tcl_AttemptDbCkalloc(size, file, line);
    if (newPtr == NULL) {

    /* These variables control generation of the error message. */
    Tcl_Obj *msg = NULL;	/* The error message. */
    Tcl_Obj *post = NULL;	/* In a few cases, an additional postscript
				 * for the error message, supplying more
				 * information after the error msg and
				 * location have been reported. */
    const char *errCode = NULL;	/* The detail word of the errorCode list, or
				 * NULL to indicate that no changes to the
				 * errorCode are to be done. */
    const char *subErrCode = NULL;
				/* Extra information for use in generating the
				 * errorCode. */
    const char *mark = "_@_";	/* In the portion of the complete error
				 * message where the error location is
				 * reported, this "mark" substring is inserted
				 * into the string being parsed to aid in
				 * pinpointing the location of the syntax
				 * error in the expression. */
    int insertMark = 0;		/* A boolean controlling whether the "mark"
				 * should be inserted. */
    const int limit = 25;	/* Portions of the error message are
				 * constructed out of substrings of the
				 * original expression. In order to keep the
				 * error message readable, we impose this
				 * limit on the substring size we extract. */

    TclParseInit(interp, start, numBytes, parsePtr);

    nodes = attemptckalloc(nodesAvailable * sizeof(OpNode));
    if (nodes == NULL) {
	TclNewLiteralStringObj(msg, "not enough memory to parse expression");
	errCode = "NOMEM";
	goto error;
    }

    /*
     * Initialize the parse tree with the special "START" node.
     */

	    do {
		newPtr = attemptckrealloc(nodes, size * sizeof(OpNode));
	    } while ((newPtr == NULL)
		    && ((size -= (size - nodesUsed) / 2) > nodesUsed));
	    if (newPtr == NULL) {
		TclNewLiteralStringObj(msg,
			"not enough memory to parse expression");
		errCode = "NOMEM";
		goto error;
	    }
	    nodesAvailable = size;
	    nodes = newPtr;
	}
	nodePtr = nodes + nodesUsed;

	/*
	 * Skip white space between lexemes.
	 */

	scanned = TclParseAllWhiteSpace(start, numBytes);
	start += scanned;
	numBytes -= scanned;

	scanned = ParseLexeme(start, numBytes, &lexeme, &literal);

	/*
	 * Use context to categorize the lexemes that are ambiguous.
	 */

	if ((NODE_TYPE & lexeme) == 0) {
	    int b;

	    switch (lexeme) {
	    case INVALID:
		msg = Tcl_ObjPrintf("invalid character \"%.*s\"",
			scanned, start);
		errCode = "BADCHAR";
		goto error;
	    case INCOMPLETE:
		msg = Tcl_ObjPrintf("incomplete operator \"%.*s\"",
			scanned, start);
		errCode = "PARTOP";
		goto error;
	    case BAREWORD:

		/*
		 * Most barewords in an expression are a syntax error. The
		 * exceptions are that when a bareword is followed by an open
		 * paren, it might be a function call, and when the bareword

		     * When we compile the expression we'll need the function
		     * name, and there's no place in the parse tree to store
		     * it, so we keep a separate list of all the function
		     * names we've parsed in the order we found them.
		     */

		    Tcl_ListObjAppendElement(NULL, funcList, literal);


		} else if (Tcl_GetBooleanFromObj(NULL,literal,&b) == TCL_OK) {
		    lexeme = BOOLEAN;
		} else {
		    Tcl_DecrRefCount(literal);
		    msg = Tcl_ObjPrintf("invalid bareword \"%.*s%s\"",

			    (scanned < limit) ? scanned : limit - 3, start,
			    (scanned < limit) ? "" : "...");
		    post = Tcl_ObjPrintf(
			    "should be \"$%.*s%s\" or \"{%.*s%s}\"",
			    (scanned < limit) ? scanned : limit - 3,
			    start, (scanned < limit) ? "" : "...",
			    (scanned < limit) ? scanned : limit - 3,
			    start, (scanned < limit) ? "" : "...");
		    Tcl_AppendPrintfToObj(post, " or \"%.*s%s(...)\" or ...",

			    (scanned < limit) ? scanned : limit - 3,
			    start, (scanned < limit) ? "" : "...");
		    if (NotOperator(lastParsed)) {
			errCode = "BADNUMBER";
			if ((lastStart[0] == '0')
				&& ((lastStart[1] == 'o')
				|| (lastStart[1] == 'O'))
				&& (lastStart[2] >= '0')
				&& (lastStart[2] <= '9')) {
			    const char *end = lastStart + 2;
			    Tcl_Obj *copy;

			    while (isdigit(UCHAR(*end))) {
				end++;
			    }
			    copy = Tcl_NewStringObj(lastStart, end-lastStart);

			    if (TclCheckBadOctal(NULL, Tcl_GetString(copy))) {

				Tcl_AppendToObj(post,
					" (invalid octal number?)", -1);
				errCode = "BADNUMBER";
				subErrCode = "OCTAL";
			    }
			    Tcl_DecrRefCount(copy);
			}
			scanned = 0;
			insertMark = 1;
			parsePtr->errorType = TCL_PARSE_BAD_NUMBER;
		    } else {
			errCode = "BAREWORD";
		    }
		    goto error;

		}
		break;
	    case PLUS:
	    case MINUS:
		if (IsOperator(lastParsed)) {
		    /*
		     * A "+" or "-" coming just after another operator must be

	    /*
	     * A leaf operand appearing just after something that's not an
	     * operator is a syntax error.
	     */

	    if (NotOperator(lastParsed)) {
		msg = Tcl_ObjPrintf("missing operator at %s", mark);
		errCode = "MISSING";
		if (lastStart[0] == '0') {
		    Tcl_Obj *copy = Tcl_NewStringObj(lastStart,
			    start + scanned - lastStart);

		    if (TclCheckBadOctal(NULL, Tcl_GetString(copy))) {
			TclNewLiteralStringObj(post,
				"looks like invalid octal number");
			errCode = "BADNUMBER_OCTAL";
		    }
		    Tcl_DecrRefCount(copy);
		}
		scanned = 0;
		insertMark = 1;
		parsePtr->errorType = TCL_PARSE_BAD_NUMBER;

		code = Tcl_ParseQuotedString(NULL, start, numBytes,
			parsePtr, 1, &end);
		scanned = end - start;
		break;

	    case BRACED:
		code = Tcl_ParseBraces(NULL, start, numBytes,
			parsePtr, 1, &end);
		scanned = end - start;
		break;

	    case VARIABLE:
		code = Tcl_ParseVarName(NULL, start, numBytes, parsePtr, 1);

		/*
		 * Handle the quirk that Tcl_ParseVarName reports a successful
		 * parse even when it gets only a "$" with no variable name.
		 */

		tokenPtr = parsePtr->tokenPtr + wordIndex + 1;
		if (code == TCL_OK && tokenPtr->type != TCL_TOKEN_VARIABLE) {
		    TclNewLiteralStringObj(msg, "invalid character \"$\"");
		    errCode = "BADCHAR";
		    goto error;
		}
		scanned = tokenPtr->size;
		break;

	    case SCRIPT: {
		Tcl_Parse *nestedPtr =
			TclStackAlloc(interp, sizeof(Tcl_Parse));

		tokenPtr = parsePtr->tokenPtr + parsePtr->numTokens;
		tokenPtr->type = TCL_TOKEN_COMMAND;
		tokenPtr->start = start;
		tokenPtr->numComponents = 0;

		end = start + numBytes;
		start++;
		while (1) {
		    code = Tcl_ParseCommand(interp, start, end - start, 1,
			    nestedPtr);
		    if (code != TCL_OK) {
			parsePtr->term = nestedPtr->term;
			parsePtr->errorType = nestedPtr->errorType;
			parsePtr->incomplete = nestedPtr->incomplete;
			break;
		    }
		    start = nestedPtr->commandStart + nestedPtr->commandSize;
		    Tcl_FreeParse(nestedPtr);
		    if ((nestedPtr->term < end) && (nestedPtr->term[0] == ']')
			    && !nestedPtr->incomplete) {
			break;
		    }

		    if (start == end) {
			TclNewLiteralStringObj(msg, "missing close-bracket");
			parsePtr->term = tokenPtr->start;
			parsePtr->errorType = TCL_PARSE_MISSING_BRACKET;
			parsePtr->incomplete = 1;
			code = TCL_ERROR;
			errCode = "UNBALANCED";
			break;
		    }
		}
		TclStackFree(interp, nestedPtr);
		end = start;
		start = tokenPtr->start;
		scanned = end - start;
		tokenPtr->size = scanned;
		parsePtr->numTokens++;
		break;
	    }			/* SCRIPT case */
	    }
	    if (code != TCL_OK) {
		/*
		 * Here we handle all the syntax errors generated by the
		 * Tcl_Token generating parsing routines called in the switch
		 * just above. If the value of parsePtr->incomplete is 1, then
		 * the error was an unbalanced '[', '(', '{', or '"' and
		 * parsePtr->term is pointing to that unbalanced character. If
		 * the value of parsePtr->incomplete is 0, then the error is
		 * one of lacking whitespace following a quoted word, for
		 * example: expr {[an error {foo}bar]}, and parsePtr->term
		 * points to where the whitespace is missing. We reset our
		 * values of start and scanned so that when our error message
		 * is constructed, the location of the syntax error is sure to
		 * appear in it, even if the quoted expression is truncated.
		 */

		start = parsePtr->term;
		scanned = parsePtr->incomplete;
		if (parsePtr->incomplete) {
		    errCode = "UNBALANCED";
		}
		goto error;
	    }

	    tokenPtr = parsePtr->tokenPtr + wordIndex;
	    tokenPtr->size = scanned;
	    tokenPtr->numComponents = parsePtr->numTokens - wordIndex - 1;
	    if (!parseOnly && ((lexeme == QUOTED) || (lexeme == BRACED))) {

	     * operand of an operator that doesn't take one.
	     */

	    if (NotOperator(lastParsed)) {
		msg = Tcl_ObjPrintf("missing operator at %s", mark);
		scanned = 0;
		insertMark = 1;
		errCode = "MISSING";
		goto error;
	    }

	    /* Create an OpNode for the unary operator */
	    nodePtr->lexeme = lexeme;
	    nodePtr->precedence = prec[lexeme];
	    nodePtr->mark = MARK_RIGHT;

			scanned = 0;
			complete = lastParsed = OT_EMPTY;
			break;
		    }
		    msg = Tcl_ObjPrintf("empty subexpression at %s", mark);
		    scanned = 0;
		    insertMark = 1;
		    errCode = "EMPTY";
		    goto error;
		}

		if (nodePtr[-1].precedence > precedence) {
		    if (nodePtr[-1].lexeme == OPEN_PAREN) {
			TclNewLiteralStringObj(msg, "unbalanced open paren");
			parsePtr->errorType = TCL_PARSE_MISSING_PAREN;
			errCode = "UNBALANCED";
		    } else if (nodePtr[-1].lexeme == COMMA) {
			msg = Tcl_ObjPrintf(
				"missing function argument at %s", mark);
			scanned = 0;
			insertMark = 1;
			errCode = "MISSING";
		    } else if (nodePtr[-1].lexeme == START) {
			TclNewLiteralStringObj(msg, "empty expression");
			errCode = "EMPTY";
		    }

		} else if (lexeme == CLOSE_PAREN) {
		    TclNewLiteralStringObj(msg, "unbalanced close paren");
		    errCode = "UNBALANCED";
		} else if ((lexeme == COMMA)
			&& (nodePtr[-1].lexeme == OPEN_PAREN)
			&& (nodePtr[-2].lexeme == FUNCTION)) {
		    msg = Tcl_ObjPrintf("missing function argument at %s",
			    mark);
		    scanned = 0;
		    insertMark = 1;

		    errCode = "UNBALANCED";
		}
		if (msg == NULL) {
		    msg = Tcl_ObjPrintf("missing operand at %s", mark);
		    scanned = 0;
		    insertMark = 1;
		    errCode = "MISSING";
		}
		goto error;
	    }

	    /*
	     * Here is where the tree comes together. At this point, we have a
	     * stack of incomplete trees corresponding to substrings that are

		 */

		/* Parens must balance */
		if ((incompletePtr->lexeme == OPEN_PAREN)
			&& (lexeme != CLOSE_PAREN)) {
		    TclNewLiteralStringObj(msg, "unbalanced open paren");
		    parsePtr->errorType = TCL_PARSE_MISSING_PAREN;
		    errCode = "UNBALANCED";
		    goto error;
		}

		/* Right operand of "?" must be ":" */
		if ((incompletePtr->lexeme == QUESTION)
			&& (NotOperator(complete)
			|| (nodes[complete].lexeme != COLON))) {

		    msg = Tcl_ObjPrintf("missing operator \":\" at %s", mark);
		    scanned = 0;
		    insertMark = 1;
		    errCode = "MISSING";
		    goto error;
		}

		/* Operator ":" may only be right operand of "?" */
		if (IsOperator(complete)
			&& (nodes[complete].lexeme == COLON)
			&& (incompletePtr->lexeme != QUESTION)) {
		    TclNewLiteralStringObj(msg,
			    "unexpected operator \":\" "
			    "without preceding \"?\"");
		    errCode = "SURPRISE";
		    goto error;
		}

		/*
		 * Attach complete tree as right operand of most recent
		 * incomplete tree.
		 */

	     * More syntax checks...
	     */

	    /* Parens must balance. */
	    if (lexeme == CLOSE_PAREN) {
		if (incompletePtr->lexeme != OPEN_PAREN) {
		    TclNewLiteralStringObj(msg, "unbalanced close paren");
		    errCode = "UNBALANCED";
		    goto error;
		}
	    }

	    /* Commas must appear only in function argument lists. */
	    if (lexeme == COMMA) {
		if  ((incompletePtr->lexeme != OPEN_PAREN)
			|| (incompletePtr[-1].lexeme != FUNCTION)) {
		    TclNewLiteralStringObj(msg,
			    "unexpected \",\" outside function argument list");
		    errCode = "SURPRISE";
		    goto error;
		}
	    }

	    /* Operator ":" may only be right operand of "?" */
	    if (IsOperator(complete) && (nodes[complete].lexeme == COLON)) {
		TclNewLiteralStringObj(msg,
			"unexpected operator \":\" without preceding \"?\"");
		errCode = "SURPRISE";
		goto error;
	    }

	    /*
	     * Create no node for a CLOSE_PAREN lexeme.
	     */

	 */

	numBytes = parsePtr->end - parsePtr->string;
	Tcl_AppendObjToErrorInfo(interp, Tcl_ObjPrintf(
		"\n    (parsing expression \"%.*s%s\")",
		(numBytes < limit) ? numBytes : limit - 3,
		parsePtr->string, (numBytes < limit) ? "" : "..."));
	if (errCode) {
	    Tcl_SetErrorCode(interp, "TCL", "PARSE", "EXPR", errCode,
		    subErrCode, NULL);
	}
    }

    return TCL_ERROR;
}

/*
 *----------------------------------------------------------------------

/*
 * tclMain.c --
 *
 *	Main program for Tcl shells and other Tcl-based applications.
 *	This file contains a generic main program for Tcl shells and other
 *	Tcl-based applications. It can be used as-is for many applications,
 *	just by supplying a different appInitProc function for each specific
 *	application. Or, it can be used as a template for creating new main
 *	programs for Tcl applications.
 *
 * Copyright (c) 1988-1994 The Regents of the University of California.
 * Copyright (c) 1994-1997 Sun Microsystems, Inc.
 * Copyright (c) 2000 Ajuba Solutions.
 *
 * See the file "license.terms" for information on usage and redistribution of
 * this file, and for a DISCLAIMER OF ALL WARRANTIES.

 * platforms which don't have <tchar.h> we have to translate that
 * to strcmp here.
 */
#ifndef __WIN32__
#   define TCHAR char
#   define TEXT(arg) arg
#   define _tcscmp strcmp


#endif

/*
 * Further on, in UNICODE mode, we need to use Tcl_NewUnicodeObj,
 * while otherwise NewNativeObj is needed (which provides proper

 * conversion from native encoding to UTF-8).
 */
#ifdef UNICODE


#   define NewNativeObj Tcl_NewUnicodeObj
#else /* !UNICODE */
    static Tcl_Obj *NewNativeObj(char *string, int length) {
	Tcl_Obj *obj;
	Tcl_DString ds;
	Tcl_ExternalToUtfDString(NULL, string, length, &ds);
	obj = Tcl_NewStringObj(Tcl_DStringValue(&ds), Tcl_DStringLength(&ds));
	Tcl_DStringFree(&ds);
	return obj;
}
#endif /* !UNICODE */

/*
 * Declarations for various library functions and variables (don't want to
 * include tclPort.h here, because people might copy this file out of the Tcl
 * source directory to make their own modified versions).
 */

} InteractiveState;

/*
 * Forward declarations for functions defined later in this file.
 */

MODULE_SCOPE Tcl_MainLoopProc *TclGetMainLoop(void);
static void		Prompt(Tcl_Interp *interp, InteractiveState *isPtr);
static void		StdinProc(ClientData clientData, int mask);

#ifndef TCL_ASCII_MAIN
static Tcl_ThreadDataKey dataKey;
/*
 *----------------------------------------------------------------------
 *

void
Tcl_SourceRCFile(
    Tcl_Interp *interp)		/* Interpreter to source rc file into. */
{
    Tcl_DString temp;
    const char *fileName;
    Tcl_Channel chan;

    fileName = Tcl_GetVar(interp, "tcl_rcFileName", TCL_GLOBAL_ONLY);
    if (fileName != NULL) {
	Tcl_Channel c;
	const char *fullName;

	Tcl_DStringInit(&temp);

	     * Test for the existence of the rc file before trying to read it.
	     */

	    c = Tcl_OpenFileChannel(NULL, fullName, "r", 0);
	    if (c != NULL) {
		Tcl_Close(NULL, c);
		if (Tcl_EvalFile(interp, fullName) != TCL_OK) {
		    chan = Tcl_GetStdChannel(TCL_STDERR);
		    if (chan) {
			Tcl_WriteObj(chan, Tcl_GetObjResult(interp));
			Tcl_WriteChars(chan, "\n", 1);
		    }
		}
	    }
	}
	Tcl_DStringFree(&temp);
    }
}

    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;

    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]))
		&& (TEXT('-') != 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) && (TEXT('-') != 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;
    }

    /*
     * 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;
    }

    /*
     * 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.
		     */

	    /*
	     * 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);


	}
#ifdef TCL_MEM_DEBUG

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

	 * 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.
     */

    /* 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);

    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);
    }
}

/*
 *----------------------------------------------------------------------
 *

 *
 *----------------------------------------------------------------------
 */

static void
Prompt(
    Tcl_Interp *interp,		/* Interpreter to use for prompting. */
    InteractiveState *isPtr) /* InteractiveState. Filled
				 * with PROMPT_NONE after a prompt is
				 * printed. */
{
    Tcl_Obj *promptCmdPtr;
    int code;
    Tcl_Channel chan;

    if (isPtr->prompt == PROMPT_NONE) {
	return;
    }

    promptCmdPtr = Tcl_GetVar2Ex(interp,
	    ((isPtr->prompt == PROMPT_CONTINUE) ? "tcl_prompt2" : "tcl_prompt1"),
	    NULL, TCL_GLOBAL_ONLY);

    if (Tcl_InterpDeleted(interp)) {
	return;
    }
    if (promptCmdPtr == NULL) {
    defaultPrompt:
	if (isPtr->prompt == PROMPT_START) {
	    chan = Tcl_GetStdChannel(TCL_STDOUT);
	    if (chan != NULL) {
		Tcl_WriteChars(chan, DEFAULT_PRIMARY_PROMPT,
			strlen(DEFAULT_PRIMARY_PROMPT));
	    }
	}
    } else {
	code = Tcl_EvalObjEx(interp, promptCmdPtr, TCL_EVAL_GLOBAL);
	if (code != TCL_OK) {
	    Tcl_AddErrorInfo(interp,
		    "\n    (script that generates prompt)");
	    chan = Tcl_GetStdChannel(TCL_STDERR);
	    if (chan != NULL) {
		Tcl_WriteObj(chan, Tcl_GetObjResult(interp));
		Tcl_WriteChars(chan, "\n", 1);
	    }
	    goto defaultPrompt;
	}
    }

    chan = Tcl_GetStdChannel(TCL_STDOUT);
    if (chan != NULL) {
	Tcl_Flush(chan);
    }
    isPtr->prompt = PROMPT_NONE;
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * End:
 */

		     * place. Take care with the start and size fields of each
		     * token so they point to the right literal characters in
		     * the original script to represent the right expanded
		     * word value.
		     */

		    nextElem = tokenPtr[1].start;

		    while (nextElem < listEnd) {
			int quoted, brace;
	

			tokenPtr->type = TCL_TOKEN_SIMPLE_WORD;
			tokenPtr->numComponents = 1;


			tokenPtr++;
			tokenPtr->type = TCL_TOKEN_TEXT;
			tokenPtr->numComponents = 0;
			TclFindElement(NULL, nextElem, listEnd - nextElem,
				&(tokenPtr->start), &nextElem,
				&(tokenPtr->size), &brace);

			quoted = brace || tokenPtr->start[-1] == '"';
			tokenPtr[-1].start = tokenPtr->start - quoted;

			tokenPtr[-1].size = tokenPtr->start + tokenPtr->size
				- tokenPtr[-1].start + quoted;




			tokenPtr++;
		    }
		}
	    } else {
		/*
		 * The word to be expanded is not a literal, so defer

    procArgs = TclGetString(objv[2]);

    while (*procArgs == ' ') {
	procArgs++;
    }

    if ((procArgs[0] == 'a') && (strncmp(procArgs, "args", 4) == 0)) {
	int numBytes;

	procArgs +=4;
	while (*procArgs != '\0') {
	    if (*procArgs != ' ') {
		goto done;
	    }
	    procArgs++;
	}

	/*
	 * The argument list is just "args"; check the body
	 */

	procBody = Tcl_GetStringFromObj(objv[3], &numBytes);
	if (TclParseAllWhiteSpace(procBody, numBytes) < numBytes) {

	    goto done;


	}

	/*
	 * The body is just spaces: link the compileProc
	 */

	((Command *) cmd)->compileProc = TclCompileNoOp;