infix(INFIX *in, bool first)
{
	if (in->curpol->type == VAL)
	{
		char	   *op = in->op + in->curpol->distance;

		RESIZEBUF(in, in->curpol->length * 2 + 5);
		while (*op)
		{
			*(in->cur) = *op;
			op++;
			in->cur++;
		}
		if (in->curpol->flag & LVAR_SUBLEXEME)
		{
			*(in->cur) = '%';
			in->cur++;
		}
		if (in->curpol->flag & LVAR_INCASE)
		{
			*(in->cur) = '@';
			in->cur++;
		}
		if (in->curpol->flag & LVAR_ANYEND)
		{
			*(in->cur) = '*';
			in->cur++;
		}
		*(in->cur) = '\0';
		in->curpol++;
	}
	else if (in->curpol->val == (int32) '!')
	{
		bool		isopr = false;

		RESIZEBUF(in, 1);
		*(in->cur) = '!';
		in->cur++;
		*(in->cur) = '\0';
		in->curpol++;
		if (in->curpol->type == OPR)
		{
			isopr = true;
			RESIZEBUF(in, 2);
			sprintf(in->cur, "( ");
			in->cur = strchr(in->cur, '\0');
		}
		infix(in, isopr);
		if (isopr)
		{
			RESIZEBUF(in, 2);
			sprintf(in->cur, " )");
			in->cur = strchr(in->cur, '\0');
		}
	}
	else
	{
		int32		op = in->curpol->val;
		INFIX		nrm;

		in->curpol++;
		if (op == (int32) '|' && !first)
		{
			RESIZEBUF(in, 2);
			sprintf(in->cur, "( ");
			in->cur = strchr(in->cur, '\0');
		}

		nrm.curpol = in->curpol;
		nrm.op = in->op;
		nrm.buflen = 16;
		nrm.cur = nrm.buf = (char *) palloc(sizeof(char) * nrm.buflen);

		/* get right operand */
		infix(&nrm, false);

		/* get & print left operand */
		in->curpol = nrm.curpol;
		infix(in, false);

		/* print operator & right operand */
		RESIZEBUF(in, 3 + (nrm.cur - nrm.buf));
		sprintf(in->cur, " %c %s", op, nrm.buf);
		in->cur = strchr(in->cur, '\0');
		pfree(nrm.buf);

		if (op == (int32) '|' && !first)
		{
			RESIZEBUF(in, 2);
			sprintf(in->cur, " )");
			in->cur = strchr(in->cur, '\0');
		}
	}
}

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