Fixed the XOVER command for compatibility with tin (newsreader), now

returns error 412 instead 500 if no article is specified and no article was
previously selected. Also, OVER is now synonymous with XOVER.

exec/nntpservice.js

@@ -278,23 +278,22 @@ while(client.socket.is_connected) {
 					,selected.newsgroup
 					));
 			else {
-				writeln("411 no such news group");
+				writeln("411 no such newsgroup");
 				log("!no such group");
 			}
 			break;
 
+		case "OVER":
 		case "XOVER":
-			if(cmd[1]==undefined) {
-				writeln("500 Syntax error or unknown command");
-				break;
-			}
 			if(msgbase==null) {
-				writeln("412 no news group selected");
+				writeln("412 no newsgroup selected");
 				break;
 			}
 			writeln("224 Overview information follows");
 			var first, last;
-			if(cmd[1].indexOf('-')>=0)	{ /* range */
+			if(cmd[1]==undefined)
+				first=last=current_article;
+			else if(cmd[1].indexOf('-')>=0)	{ /* range */
 				range=cmd[1].split('-');
 				first=Number(range[0]);
 				last=Number(range[1]);
@@ -326,7 +325,7 @@ while(client.socket.is_connected) {
 				break;
 			}
 			if(msgbase==null) {
-				writeln("412 no news group selected");
+				writeln("412 no newsgroup selected");
 				break;
 			}
 			writeln("221 Header follows");
@@ -397,7 +396,7 @@ while(client.socket.is_connected) {
 		case "BODY":
 		case "STAT":
 			if(msgbase==null) {
-				writeln("412 no news group selected");
+				writeln("412 no newsgroup selected");
 				break;
 			}
 			if(cmd[1]==undefined) {
@@ -493,7 +492,7 @@ while(client.socket.is_connected) {
 
 				if(hdr.from_org==undefined && !hdr.from_net_type)
 					hdr.from_org=system.name;
-		
+
 				write_news_header(hdr,writeln);	// from newsutil.js
 			}
 			if(hdr!=null && body!=null)	/* both, separate with blank line */
@@ -508,7 +507,7 @@ while(client.socket.is_connected) {
 		case "NEXT":
 		case "LAST":
 			if(msgbase==null) {
-				writeln("412 no news group selected");
+				writeln("412 no newsgroup selected");
 				break;
 			}
 			if(current_article<1) {