Tcl_DString ds;

    /* characters to enclose in quotes if unpaired quote flag set */
    const static char *specMetaChars = "&|^<>!()%";
    /* characters to enclose in quotes in any case (regardless unpaired-flag) */
    const static char *specMetaChars2 = "%";

    /* Quote flags:
     *   CL_ESCAPE   - escape argument;
     *   CL_QUOTE    - enclose in quotes;
     *   CL_UNPAIRED - previous arguments chain contains unpaired quote-char;
     */
    enum {CL_ESCAPE = 1, CL_QUOTE = 2, CL_UNPAIRED = 4};

    Tcl_DStringInit(&ds);

    /*
     * Prime the path. Add a space separator if we were primed with something.
     */

    Tcl_DStringAppend(&ds, Tcl_DStringValue(linePtr), -1);
    if (Tcl_DStringLength(linePtr) > 0) {
	Tcl_DStringAppend(&ds, " ", 1);
    }

    for (i = 0; i < argc; i++) {
	if (i == 0) {
	    arg = executable;
	} else {
	    arg = argv[i];
	    Tcl_DStringAppend(&ds, " ", 1);
	}






	quote &= ~(CL_ESCAPE|CL_QUOTE); /* reset escape flags */
	bspos = NULL;
	if (arg[0] == '\0') {
	    quote = CL_QUOTE;
	} else {
	    int count;
	    Tcl_UniChar ch;
	    for (start = arg;
		*start != '\0' &&
		    (quote & (CL_ESCAPE|CL_QUOTE)) != (CL_ESCAPE|CL_QUOTE);
		start += count
	    ) {
		count = Tcl_UtfToUniChar(start, &ch);
		if (count > 1) continue;
		if (Tcl_UniCharIsSpace(ch)) {
		    quote |= CL_QUOTE; /* quote only */
		    if (bspos) { /* if backslash found - escape & quote */
			quote |= CL_ESCAPE;
			break;
		    }
		    continue;
		}
		if (strchr(specMetaChars, *start)) {

		    quote |= (CL_ESCAPE|CL_QUOTE); /*escape & quote */
		    break;
		}
		if (*start == '"') {
		    quote |= CL_ESCAPE; /* escape only */
		    continue;
		}
		if (*start == '\\') {
		    bspos = start;
		    if (quote & CL_QUOTE) { /* if quote - escape & quote */
			quote |= CL_ESCAPE;
			break;
		    }
		    continue;
		}
	    }
	    bspos = NULL;
	}
	if (quote & CL_QUOTE) {
	    /* start of argument (main opening quote-char) */
	    Tcl_DStringAppend(&ds, "\"", 1);
	}
	if (!(quote & CL_ESCAPE)) {
	    /* nothing to escape */
	    Tcl_DStringAppend(&ds, arg, -1);
	} else {




	    start = arg;
	    for (special = arg; *special != '\0'; ) {
		/* position of `\` is important before quote or at end (equal `\"` because quoted) */
		if (*special == '\\') {
		    /* bypass backslashes (and mark first backslash possition)*/
		    special = BuildCmdLineBypassBS(special, &bspos);
		    if (*special == '\0') break;
		}
		/* ["] */
		if (*special == '"') {
		    quote ^= CL_UNPAIRED; /* invert unpaired flag - observe unpaired quotes */
		    /* add part before (and escape backslashes before quote) */
		    QuoteCmdLineBackslash(&ds, start, special, bspos);
		    bspos = NULL;
		    /* escape using backslash */
		    Tcl_DStringAppend(&ds, "\\\"", 2);
		    start = ++special;
		    continue;
		}
		/* unpaired (escaped) quote causes special handling on meta-chars */
		if ((quote & CL_UNPAIRED) && strchr(specMetaChars, *special)) {
		    special = QuoteCmdLinePart(&ds, start, special, specMetaChars, &bspos);
		    /* start to current or first backslash */
		    start = !bspos ? special : bspos;
		    continue;
		}
		/* special case for % - should be enclosed always (paired also) */
		if (strchr(specMetaChars2, *special)) {
		    special = QuoteCmdLinePart(&ds, start, special, specMetaChars2, &bspos);
		    /* start to current or first backslash */
		    start = !bspos ? special : bspos;
		    continue;
		}
		/* other not special (and not meta) character */
		bspos = NULL; /* reset last backslash possition (not interesting) */
		special++;
	    }

	    /* rest of argument (and escape backslashes before closing main quote) */
	    QuoteCmdLineBackslash(&ds, start, special, 
	    	(quote & CL_QUOTE) ? bspos : NULL);
	}
	if (quote & CL_QUOTE) {
	    /* end of argument (main closing quote-char) */
	    Tcl_DStringAppend(&ds, "\"", 1);




	}
    }
    Tcl_DStringFree(linePtr);
    Tcl_WinUtfToTChar(Tcl_DStringValue(&ds), Tcl_DStringLength(&ds), linePtr);
    Tcl_DStringFree(&ds);
}