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mothra: fix j command

--- a/sys/src/cmd/mothra/mothra.c

+++ b/sys/src/cmd/mothra/mothra.c

@@ -540,11 +540,11 @@

 		else geturl(s, GET, 0, 1, 0);

 		break;

 	case 'j':

-		s=arg(s);

+		s = arg(s);

 		if(*s)

-			geturl(www(atoi(s)-1)->url->fullname, GET, 0, 0, 0);

+			doprev(nil, 1, wwwtop-atoi(s));

 		else

-			message("no url selected");

+			message("Usgae: j index");

 		break;

 	case 'r':

 		s = arg(s);

@@ -601,7 +601,7 @@

 void doprev(Panel *p, int buttons, int index){

 	int i;

 	USED(p);

-	if(index >= nwww())

+	if(index < 0 || index >= nwww())

 		return;

 	i = wwwtop-index-1;

 	switch(buttons){

-- 

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