lquery_out(PG_FUNCTION_ARGS)
{
	lquery	   *in = PG_GETARG_LQUERY(0);
	char	   *buf,
			   *ptr;
	int			i,
				j,
				totallen = 1;
	lquery_level *curqlevel;
	lquery_variant *curtlevel;

	curqlevel = LQUERY_FIRST(in);
	for (i = 0; i < in->numlevel; i++)
	{
		totallen++;
		if (curqlevel->numvar)
			totallen += 1 + (curqlevel->numvar * 4) + curqlevel->totallen;
		else
			totallen += 2 * 11 + 4;
		curqlevel = LQL_NEXT(curqlevel);
	}

	ptr = buf = (char *) palloc(totallen);
	curqlevel = LQUERY_FIRST(in);
	for (i = 0; i < in->numlevel; i++)
	{
		if (i != 0)
		{
			*ptr = '.';
			ptr++;
		}
		if (curqlevel->numvar)
		{
			if (curqlevel->flag & LQL_NOT)
			{
				*ptr = '!';
				ptr++;
			}
			curtlevel = LQL_FIRST(curqlevel);
			for (j = 0; j < curqlevel->numvar; j++)
			{
				if (j != 0)
				{
					*ptr = '|';
					ptr++;
				}
				memcpy(ptr, curtlevel->name, curtlevel->len);
				ptr += curtlevel->len;
				if ((curtlevel->flag & LVAR_SUBLEXEME))
				{
					*ptr = '%';
					ptr++;
				}
				if ((curtlevel->flag & LVAR_INCASE))
				{
					*ptr = '@';
					ptr++;
				}
				if ((curtlevel->flag & LVAR_ANYEND))
				{
					*ptr = '*';
					ptr++;
				}
				curtlevel = LVAR_NEXT(curtlevel);
			}
		}
		else
		{
			if (curqlevel->low == curqlevel->high)
			{
				sprintf(ptr, "*{%d}", curqlevel->low);
			}
			else if (curqlevel->low == 0)
			{
				if (curqlevel->high == 0xffff)
				{
					*ptr = '*';
					*(ptr + 1) = '\0';
				}
				else
					sprintf(ptr, "*{,%d}", curqlevel->high);
			}
			else if (curqlevel->high == 0xffff)
			{
				sprintf(ptr, "*{%d,}", curqlevel->low);
			}
			else
				sprintf(ptr, "*{%d,%d}", curqlevel->low, curqlevel->high);
			ptr = strchr(ptr, '\0');
		}

		curqlevel = LQL_NEXT(curqlevel);
	}

	*ptr = '\0';
	PG_FREE_IF_COPY(in, 0);

	PG_RETURN_POINTER(buf);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.