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ip/traceroute: sprint() -> snprint()

--- a/sys/src/cmd/ip/traceroute.c

+++ b/sys/src/cmd/ip/traceroute.c

@@ -270,7 +270,7 @@

 	msg[n] = 0;

 	/* open data file */

-	sprint(file, "%s/%s/%s/data", ds->netdir, ds->proto, msg);

+	snprint(file, sizeof(file), "%s/%s/%s/data", ds->netdir, ds->proto, msg);

 	dfd = open(file, ORDWR);

 	if(dfd < 0)

 		goto out;

-- 

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