Perhaps I'm not reading it right, but isn't that the same as:
ovf = MIN2( nr, 2 ); for (i = 0 ; i < ovf ; i++) copy_vertex( rmesa, nr-ovf+i, tmp[i] ); return i;
In both cases if nr==0 no work is done and 0 is returned. If nr==1 one vertex is copied and 1 is returned. In all other cases 2 vertices are copied and 2 is returned.
This patch (and I'd suppose the obfuscated versions too ;-)) causes ut2k3 to instantly lock up as soon as a game is started (instant action, dm-asbestos, spectate). Without the patch it's possible to walk around in a mess of triangles some time until it eventually locks up (dri trunk about 2 days old, R200 driver (tested on a RV250)).
Of course that doesn't mean the patch is wrong, it could just trigger another bug.
Roland
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