ckdb - avoid divide by zero

pool/page.php

@@ -199,7 +199,18 @@ function pgtop($dotop, $user, $douser)
 	}
 
 	if (isset($info['blockacc']))
-		$pac = number_format($info['blockacc'], 0);
+	{
+		$acc = $info['blockacc'];
+		$pac = number_format($acc, 0);
+		if ($acc >= 1000000)
+			$pac .= ' '.siprefmt($acc);
+		if (isset($info['currndiff']))
+		{
+			$cur = $info['currndiff'];
+			if ($cur != '?' && $cur > 0.0)
+				$pac .= ' ('.number_format(100.0*$acc/$cur, 2).'%)';
+		}
+	}
 
 	if (isset($info['blockerr']))
 		$per = number_format($info['blockerr'], 0);

src/ckdb.c

@@ -4976,15 +4976,15 @@ flail:
 		else {
 			char pct[16] = "?";
 			char est[16] = "";
-
-			if (pool.diffacc) {
-				K_ITEM *w_item;
-				w_item = find_workinfo(DATA_BLOCKS(b_item)->workinfoid);
-				if (w_item) {
-					char wdiffbin[TXT_SML+1];
-					double wdiff;
-					hex2bin(wdiffbin, DATA_WORKINFO(w_item)->bits, 4);
-					wdiff = diff_from_nbits(wdiffbin);
+			K_ITEM *w_item;
+
+			w_item = find_workinfo(DATA_BLOCKS(b_item)->workinfoid);
+			if (w_item) {
+				char wdiffbin[TXT_SML+1];
+				double wdiff;
+				hex2bin(wdiffbin, DATA_WORKINFO(w_item)->bits, 4);
+				wdiff = diff_from_nbits(wdiffbin);
+				if (wdiff > 0.0) {
 					snprintf(pct, sizeof(pct), "%.2f",
 						 100.0 * pool.diffacc / wdiff);
 				}