/usr/share/tkgate/primitives/tribuf.v is in tkgate-data 2.0~b10-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | module tribuf #(.Dez(1), .Diz(1)) (Z, I, E);
input ${IZ_RANGE} I;
input E;
output ${IZ_RANGE} Z;
specify
(E *> Z) = Dez;
(I *> Z) = Diz;
endspecify
assign Z = E ? (${invZ}I) : ${IZ_BITS}'bz;
endmodule // buf
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