Tcl_Interp *interp,		/* Used for error reporting. May be NULL. */
    Tcl_Obj *objPtr,		/* Object to receive the internal rep. */
    const char *expected,	/* Description of the type of number the
				 * caller expects to be able to parse
				 * ("integer", "boolean value", etc.). */
    const char *bytes,		/* Pointer to the start of the string to
				 * scan. */
    size_t numBytes,		/* Maximum number of bytes to scan, see
				 * above. */
    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,