mothra: clicking on the url scroll bar, snarfing, or saving a hit when no urls have been loaded (right after running mothra) would crash. this was due to use of w->url and selection when they are actually nil.

to fix this, make genwww return 0 if w->url is nil and output an error message when attempting to access selection if it's nil. the problem with the w->url fix is that after clicking on the url scroll bar, an empty url history row could be highlighted by clicking on it. fix this by making sure lp->lo is not less than zero.

1 files changed, 1 insertions, 1 deletions

diff --git a/sys/src/cmd/mothra/libpanel/list.c b/sys/src/cmd/mothra/libpanel/list.c
index fb9b676f7..8f4b0766f 100644
--- a/sys/src/cmd/mothra/libpanel/list.c
+++ b/sys/src/cmd/mothra/libpanel/list.c
@@ -22,7 +22,7 @@ void pl_listsel(Panel *p, int sel, int on){
 	Rectangle r;
 	lp=p->data;
 	hi=lp->lo+(lp->listr.max.y-lp->listr.min.y)/font->height;
-	if(lp->lo<=sel && sel<hi && sel<lp->len){
+	if(lp->lo>=0 && lp->lo<=sel && sel<hi && sel<lp->len){
 		r=lp->listr;
 		r.min.y+=(sel-lp->lo)*font->height;
 		r.max.y=r.min.y+font->height;