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@ -465,8 +465,12 @@ int32 CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)
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ret = DoCommand(start_tile, 0, 0, flags, CMD_LANDSCAPE_CLEAR);
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if (CmdFailed(ret)) return ret;
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cost = _price.build_tunnel + ret;
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/* XXX - do NOT change 'ret' in the loop, as it is used as the price
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* for the clearing of the entrance of the tunnel. Assigning it to
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* cost before the loop will yield different costs depending on start-
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* position, because of increased-cost-by-length: 'cost += cost >> 3' */
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cost = 0;
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delta = TileOffsByDir(direction);
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end_tile = start_tile;
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for (;;) {
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@ -480,10 +484,13 @@ int32 CmdBuildTunnel(TileIndex start_tile, uint32 flags, uint32 p1, uint32 p2)
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}
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cost += _price.build_tunnel;
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cost += cost >> 3;
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cost += cost >> 3; // add a multiplier for longer tunnels
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if (cost >= 400000000) cost = 400000000;
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}
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/* Add the cost of the entrance */
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cost += _price.build_tunnel + ret;
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// if the command fails from here on we want the end tile to be highlighted
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_build_tunnel_endtile = end_tile;
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