Function parser

3rdparty/bx/src/dtoa.cpp:711–924

	}

	static int parser(const char* _s, const char* _term, PrepNumber* _pn)
	{
		int state = FSM_A;
		int digx = 0;
		char c = ' ';            /* initial value for kicking off the state machine */
		int result = PARSER_OK;
		int expneg = 0;
		int32_t expexp = 0;

		while (state != FSM_STOP) // && _s != _term)
		{
			switch (state)
			{
			case FSM_A:
				if (isSpace(c) )
				{
					c = next(_s, _term);
				}
				else
				{
					state = FSM_B;
				}
				break;

			case FSM_B:
				state = FSM_C;

				if (c == '+')
				{
					c = next(_s, _term);
				}
				else if (c == '-')
				{
					_pn->negative = 1;
					c = next(_s, _term);
				}
				else if (isNumeric(c) )
				{
				}
				else if (c == '.')
				{
				}
				else
				{
					state = FSM_STOP;
				}
				break;

			case FSM_C:
				if (c == '0')
				{
					c = next(_s, _term);
				}
				else if (c == '.')
				{
					c = next(_s, _term);
					state = FSM_D;
				}