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BSD 4.3reno

BEGIN	{
	    printf "from %s to %s:\n", AGENT, DEST;
	    tried[AGENT] = 1;
	    INVALID = 2; DIRECT = 3;

	    while (DEST != AGENT) {
		dr = 0;
		if ((hop = ipRouteNextHop[addr = DEST]) \
			&& (type = ipRouteType[addr]) == INVALID)
		    hop = 0;
		if (!hop \
			&& (hop = ipRouteNextHop[addr = "0.0.0.0"]) \
			&& (type = ipRouteType[addr]) != INVALID)
		    dr = 1;
		if (hop) {
		    printf "    via %-15s metric %2d%s\n",
			    hop, ipRouteMetric1[addr],
			    dr ? " (default route)" : "";
		}
		else {
		    printf "\nno path to %s from %s\n%s\n", 
			    DEST, AGENT, DIAGNOSTIC;
		    exit(1);
		}

		if (type == DIRECT)
		    exit(0);

		if (hop in tried)
		    printf "\nrouting loop!\n";
		else
		    tried[hop] = 1;
		AGENT = hop;
	    }
	}

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