size_t acceptLen;		/* Number of characters following that
				 * point. */
    int status = TCL_OK;	/* Status to return to caller. */
    char d = 0;			/* Last hexadecimal digit scanned; initialized
				 * to avoid a compiler warning. */
    int shift = 0;		/* Amount to shift when accumulating binary */
    int explicitOctal = 0;
    int under = 0;              /* Flag trailing '_' as error if true once
				 * number is accepted. */

    
#define ALL_BITS	((Tcl_WideUInt)-1)
#define MOST_BITS	(ALL_BITS >> 1)

    /*
     * Initialize bytes to start of the object's string rep if the caller
     * didn't pass anything else.
     */

	     * OCTAL state differ only in whether they recognize 'X' and 'b'.
	     */

	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    if (c == 'x' || c == 'X') {
		under = 0;
		if (flags & (TCL_PARSE_OCTAL_ONLY|TCL_PARSE_BINARY_ONLY)) {
		    goto endgame;
		}
		state = ZERO_X;
		break;
	    }
	    if (flags & TCL_PARSE_HEXADECIMAL_ONLY) {
		goto zerox;
	    }
	    if (flags & TCL_PARSE_SCAN_PREFIXES) {
		goto zeroo;
	    }
	    if (c == 'b' || c == 'B') {
		under = 0;
		if (flags & TCL_PARSE_OCTAL_ONLY) {
		    goto endgame;
		}
		state = ZERO_B;
		break;
	    }
	    if (flags & TCL_PARSE_BINARY_ONLY) {
		goto zerob;
	    }
	    if (c == 'o' || c == 'O') {
		explicitOctal = 1;
		under = 0;
		state = ZERO_O;
		break;
	    }
	    if (c == 'd' || c == 'D') {
		under = 0;
		state = ZERO_D;
		break;
	    }
#ifdef TCL_NO_DEPRECATED
	    goto decimal;
#endif
	    /* FALLTHROUGH */

	    acceptPoint = p;
	    acceptLen = len;
	    /* FALLTHROUGH */
	case ZERO_O:
	zeroo:
	    if (c == '0') {
		numTrailZeros++;
		under = 0;
		state = OCTAL;
		break;
	    } else if (c >= '1' && c <= '7') {
		under = 0;
		if (objPtr != NULL) {
		    shift = 3 * (numTrailZeros + 1);
		    significandOverflow = AccumulateDecimalDigit(
			    (unsigned)(c-'0'), numTrailZeros,
			    &significandWide, &significandBig,
			    significandOverflow);

		    numSigDigs += numTrailZeros+1;
		} else {
		    numSigDigs = 1;
		}
		numTrailZeros = 0;
		state = OCTAL;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    }
	    /* FALLTHROUGH */

	case BAD_OCTAL:
	    if (explicitOctal) {
		/*
		 * No forgiveness for bad digits in explicitly octal numbers.

	     * Scanned a number with a leading zero that contains an 8, 9,
	     * radix point or E. This is an invalid octal number, but might
	     * still be floating point.
	     */

	    if (c == '0') {
		numTrailZeros++;
		under = 0;
		state = BAD_OCTAL;
		break;
	    } else if (isdigit(UCHAR(c))) {
		if (objPtr != NULL) {
		    significandOverflow = AccumulateDecimalDigit(
			    (unsigned)(c-'0'), numTrailZeros,
			    &significandWide, &significandBig,
			    significandOverflow);
		}
		if (numSigDigs != 0) {
		    numSigDigs += (numTrailZeros + 1);
		} else {
		    numSigDigs = 1;
		}
		numTrailZeros = 0;
		under = 0;
		state = BAD_OCTAL;
		break;
	    } else if (c == '.') {
		under = 0;
		state = FRACTION;
		break;
	    } else if (c == 'E' || c == 'e') {
		under = 0;
		state = EXPONENT_START;
		break;
	    }
#endif
	    goto endgame;

	    /*

	    acceptLen = len;
	    /* FALLTHROUGH */

	case ZERO_X:
	zerox:
	    if (c == '0') {
		numTrailZeros++;
		under = 0;
		state = HEXADECIMAL;
		break;
	    } else if (isdigit(UCHAR(c))) {
		under = 0;
		d = (c-'0');
	    } else if (c >= 'A' && c <= 'F') {
		under = 0;
		d = (c-'A'+10);
	    } else if (c >= 'a' && c <= 'f') {
		under = 0;
		d = (c-'a'+10);
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    } else {
		goto endgame;
	    }
	    if (objPtr != NULL) {
		shift = 4 * (numTrailZeros + 1);
		if (!significandOverflow) {
		    /*

	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	case ZERO_B:
	zerob:
	    if (c == '0') {
		numTrailZeros++;
		under = 0;
		state = BINARY;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    } else if (c != '1') {
		goto endgame;
	    }
	    if (objPtr != NULL) {
		shift = numTrailZeros + 1;
		if (!significandOverflow) {
		    /*

	    }
	    numTrailZeros = 0;
	    state = BINARY;
	    break;

	case ZERO_D:
	    if (c == '0') {
		under = 0;
		numTrailZeros++;
	    } else if ( ! isdigit(UCHAR(c))) {
                if (c == '_') {
                    /* Ignore numeric "white space" */
                    under = 1;
                    break;
                }
		goto endgame;
	    }
	    under = 0;
	    state = DECIMAL;
	    flags |= TCL_PARSE_INTEGER_ONLY;
	    /* FALLTHROUGH */

	case DECIMAL:
	    /*
	     * Scanned an optional + or - followed by a string of decimal
	     * digits.
	     */

#ifdef TCL_NO_DEPRECATED
	decimal:
#endif
	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    if (c == '0') {
		numTrailZeros++;
		under = 0;
		state = DECIMAL;
		break;
	    } else if (isdigit(UCHAR(c))) {
		if (objPtr != NULL) {
		    significandOverflow = AccumulateDecimalDigit(
			    (unsigned)(c - '0'), numTrailZeros,
			    &significandWide, &significandBig,
			    significandOverflow);
		}
		numSigDigs += numTrailZeros+1;
		numTrailZeros = 0;
		under = 0;
		state = DECIMAL;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    } else if (flags & TCL_PARSE_INTEGER_ONLY) {
		goto endgame;
	    } else if (c == '.') {
		under = 0;
		state = FRACTION;
		break;
	    } else if (c == 'E' || c == 'e') {
		under = 0;
		state = EXPONENT_START;
		break;
	    }
	    goto endgame;

	    /*
	     * Found a decimal point. If no digits have yet been scanned, E is

	    }
	    /* FALLTHROUGH */

	case LEADING_RADIX_POINT:
	    if (c == '0') {
		numDigitsAfterDp++;
		numTrailZeros++;
		under = 0;
		state = FRACTION;
		break;
	    } else if (isdigit(UCHAR(c))) {
		numDigitsAfterDp++;
		if (objPtr != NULL) {
		    significandOverflow = AccumulateDecimalDigit(
			    (unsigned)(c-'0'), numTrailZeros,
			    &significandWide, &significandBig,
			    significandOverflow);
		}
		if (numSigDigs != 0) {
		    numSigDigs += numTrailZeros+1;
		} else {
		    numSigDigs = 1;
		}
		numTrailZeros = 0;
		under = 0;
		state = FRACTION;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    }
	    goto endgame;

	case EXPONENT_START:
	    /*
	     * Scanned the E at the start of an exponent. Make sure a legal
	     * character follows before using the C library strtol routine,
	     * which allows whitespace.
	     */

	    if (c == '+') {
		under = 0;
		state = EXPONENT_SIGNUM;
		break;
	    } else if (c == '-') {
		exponentSignum = 1;
		under = 0;
		state = EXPONENT_SIGNUM;
		break;
	    }
	    /* FALLTHROUGH */

	case EXPONENT_SIGNUM:
	    /*
	     * Found the E at the start of the exponent, followed by a sign
	     * character.
	     */

	    if (isdigit(UCHAR(c))) {
		exponent = c - '0';
		under = 0;
		state = EXPONENT;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    }
	    goto endgame;

	case EXPONENT:
	    /*
	     * Found an exponent with at least one digit. Accumulate it,
	     * making sure to hard-pin it to LONG_MAX on overflow.
	     */

	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    if (isdigit(UCHAR(c))) {
		if (exponent < (LONG_MAX - 9) / 10) {
		    exponent = 10 * exponent + (c - '0');
		} else {
		    exponent = LONG_MAX;
		}
		under = 0;
		state = EXPONENT;
		break;
            } else if (c == '_') {
                /* Ignore numeric "white space" */
                under = 1;
                break;
	    }
	    goto endgame;

	    /*
	     * Parse out INFINITY by simply spelling it out. INF is accepted
	     * as an abbreviation; other prefices are not.
	     */

	case sI:
	    if (c == 'n' || c == 'N') {
		under = 0;
		state = sIN;
		break;
	    }
	    goto endgame;
	case sIN:
	    if (c == 'f' || c == 'F') {
		under = 0;
		state = sINF;
		break;
	    }
	    goto endgame;
	case sINF:
	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
            under = 0;
	    if (c == 'i' || c == 'I') {
		state = sINFI;
		break;
	    }
	    goto endgame;
	case sINFI:
	    if (c == 'n' || c == 'N') {
		under = 0;
		state = sINFIN;
		break;
	    }
	    goto endgame;
	case sINFIN:
	    if (c == 'i' || c == 'I') {
		under = 0;
		state = sINFINI;
		break;
	    }
	    goto endgame;
	case sINFINI:
	    if (c == 't' || c == 'T') {
		under = 0;
		state = sINFINIT;
		break;
	    }
	    goto endgame;
	case sINFINIT:
	    if (c == 'y' || c == 'Y') {
		under = 0;
		state = sINFINITY;
		break;
	    }
	    goto endgame;

	    /*
	     * Parse NaN's.
	     */
#ifdef IEEE_FLOATING_POINT
	case sN:
	    if (c == 'a' || c == 'A') {
		under = 0;
		state = sNA;
		break;
	    }
	    goto endgame;
	case sNA:
	    if (c == 'n' || c == 'N') {
		under = 0;
		state = sNAN;
		break;
	    }
	    goto endgame;
	case sNAN:
	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    if (c == '(') {
		under = 0;
		state = sNANPAREN;
		break;
	    }
	    goto endgame;

	    /*
	     * Parse NaN(hexdigits)
	     */
	case sNANHEX:
	    if (c == ')') {
		under = 0;
		state = sNANFINISH;
		break;
	    }
	    /* FALLTHROUGH */
	case sNANPAREN:
	    if (TclIsSpaceProc(c)) {
		under = 0;
		break;
	    }
	    if (numSigDigs < 13) {
		if (c >= '0' && c <= '9') {
		    d = c - '0';
		} else if (c >= 'a' && c <= 'f') {
		    d = 10 + c - 'a';
		} else if (c >= 'A' && c <= 'F') {
		    d = 10 + c - 'A';
		} else {
		    goto endgame;
		}
		numSigDigs++;
		significandWide = (significandWide << 4) + d;
		under = 0;
		state = sNANHEX;
		break;
	    }
	    goto endgame;
	case sNANFINISH:
#endif

	case sINFINITY:
	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    goto endgame;

	}
	p++;
	len--;
    }

  endgame:
    if (acceptState == INITIAL) {
	/*
	 * No numeric string at all found.
	 */

	status = TCL_ERROR;
	if (endPtrPtr != NULL) {
	    *endPtrPtr = p;
	}
    } else {
	/*
	 * Back up to the last accepting state in the lexer.
	 * Back up to the last accepting state in the lexer.  
	 * If the last char seen is the numeric whitespace character '_',
	 * backup to that.
	 */

	p = acceptPoint;
	len = acceptLen;
	p = under ? acceptPoint-1 : acceptPoint;
	len = under ? acceptLen-1 : acceptLen;

	if (!(flags & TCL_PARSE_NO_WHITESPACE)) {
	    /*
	     * Accept trailing whitespace.
	     */

	    while (len != 0 && TclIsSpaceProc(*p)) {
		p++;