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libpanel: fix %.*s format in pl_snarfentry()

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

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

@@ -22,8 +22,8 @@

 	if(p->flags&USERFL)	/* no snarfing from password entry */

 		return nil;

 	ep=p->data;

-	n=ep->entp-ep->entry;

-	if(n<=0) return nil;

+	n=utfnlen(ep->entry, ep->entp-ep->entry);

+	if(n<1) return nil;

 	return smprint("%.*s", n, ep->entry);

 }

 void pl_pasteentry(Panel *p, char *s){

-- 

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