shithub: battleship

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only send a shot if the target cell is clear/unknown.

--- a/bts.c

+++ b/bts.c

@@ -643,8 +643,10 @@

 		cell = toboard(&alienboard, mc->xy);

 		/* TODO check if we already shot at that cell */

 		cell2coords(buf, sizeof buf, cell);

-		chanprint(egress, "shoot %s\n", buf);

-		lastshot = cell;

+		if(gettile(&alienboard, cell) == Twater){

+			chanprint(egress, "shoot %s\n", buf);

+			lastshot = cell;

+		}

 		break;

 	}

 }