* this file, and for a DISCLAIMER OF ALL WARRANTIES.
 */

#include "tclInt.h"
#include "tommath.h"
#include <math.h>

/*
 * Define KILL_OCTAL to suppress interpretation of numbers with leading zero
 * as octal. (Ceterum censeo: numeros octonarios delendos esse.)
 */

#define KILL_OCTAL

/*
 * This code supports (at least hypothetically), IBM, Cray, VAX and IEEE-754
 * floating point; of these, only IEEE-754 can represent NaN. IEEE-754 can be
 * uniquely determined by radix and by the widths of significand and exponent.
 */

#if (FLT_RADIX == 2) && (DBL_MANT_DIG == 53) && (DBL_MAX_EXP == 1024)

    const char **endPtrPtr,	/* Place to store pointer to the character
				 * that terminated the scan. */
    int flags)			/* Flags governing the parse. */
{
    enum State {
	INITIAL, SIGNUM, ZERO, ZERO_X,
	ZERO_O, ZERO_B, BINARY,
	HEXADECIMAL, OCTAL, BAD_OCTAL, DECIMAL,
	HEXADECIMAL, OCTAL, DECIMAL,
	LEADING_RADIX_POINT, FRACTION,
	EXPONENT_START, EXPONENT_SIGNUM, EXPONENT,
	sI, sIN, sINF, sINFI, sINFIN, sINFINI, sINFINIT, sINFINITY
#ifdef IEEE_FLOATING_POINT
	, sN, sNA, sNAN, sNANPAREN, sNANHEX, sNANFINISH
#endif
    } state = INITIAL;

		goto zerob;
	    }
	    if (c == 'o' || c == 'O') {
		explicitOctal = 1;
		state = ZERO_O;
		break;
	    }
#ifdef KILL_OCTAL
	    goto decimal;
#endif
	    /* FALLTHROUGH */

	case OCTAL:
	    /*
	     * Scanned an optional + or -, followed by a string of octal
	     * digits. Acceptable inputs are more digits, period, or E. If 8
	     * or 9 is encountered, commit to floating point.
	     */

		} else {
		    numSigDigs = 1;
		}
		numTrailZeros = 0;
		state = OCTAL;
		break;
	    }
	    /* FALLTHROUGH */

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

		goto endgame;
	    }
	    if (flags & TCL_PARSE_INTEGER_ONLY) {
		/*
		 * No seeking floating point when parsing only integer.
		 */

		goto endgame;
	    }
#ifndef KILL_OCTAL

	    /*
	     * 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++;
		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;
		state = BAD_OCTAL;
		break;
	    } else if (c == '.') {
		state = FRACTION;
		break;
	    } else if (c == 'E' || c == 'e') {
		state = EXPONENT_START;
		break;
	    }
#endif
	    goto endgame;

	    /*
	     * Scanned 0x. If state is HEXADECIMAL, scanned at least one
	     * character following the 0x. The only acceptable inputs are
	     * hexadecimal digits.
	     */

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

#ifdef KILL_OCTAL
	decimal:
#endif
	    acceptState = state;
	    acceptPoint = p;
	    acceptLen = len;
	    if (c == '0') {
		numTrailZeros++;
		state = DECIMAL;
		break;

     * Generate and store the appropriate internal rep.
     */

    if (status == TCL_OK && objPtr != NULL) {
	TclFreeIntRep(objPtr);
	switch (acceptState) {
	case SIGNUM:
	case BAD_OCTAL:
	case ZERO_X:
	case ZERO_O:
	case ZERO_B:
	case LEADING_RADIX_POINT:
	case EXPONENT_START:
	case EXPONENT_SIGNUM:
	case sI:

    if (status != TCL_OK) {
	if (interp != NULL) {
	    Tcl_Obj *msg = Tcl_ObjPrintf("expected %s but got \"",
		    expected);

	    Tcl_AppendLimitedToObj(msg, bytes, numBytes, 50, "");
	    Tcl_AppendToObj(msg, "\"", -1);
	    if (state == BAD_OCTAL) {
		Tcl_AppendToObj(msg, " (looks like invalid octal number)", -1);
	    }
	    Tcl_SetObjResult(interp, msg);
	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "NUMBER", NULL);
	}
    }

    /*
     * Free memory.