fix: harden small core containers

strans.c

@@ -724,6 +724,12 @@ keystroke(u32int ks, u32int mod, Str *com)
 	}
 	if(im.l->trans == nil)
 		return 0;
+	if(im.pre.n >= Maxrunes ||
+	   (isjp(&im) && im.pre.n + im.raw.n >= Maxrunes)){
+		commit(com);
+		reset();
+		return 0;
+	}
 	if(im.l->lang == LangKO)
 		ks = kokey(ks, mod);
 	n = dotrans(ks, com);
@@ -858,7 +864,9 @@ mapinit(char *dir)
 	for(i = 0; i < nelem(langs); i++){
 		if(langs[i].mapname == nil)
 			continue;
-		snprint(path, sizeof(path), "%s/%s.map", dir, langs[i].mapname);
+		if(snprint(path, sizeof(path), "%s/%s.map", dir,
+		   langs[i].mapname) >= (int)sizeof path)
+			die("map path too long: %s/%s.map", dir, langs[i].mapname);
 		langs[i].map = trieopen(path);
 	}
 }