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Comment by anon4 | Hacker News Reader

As a bonus, this works with e.g.

  char buf[256]; buf[0] = 'x'; buf[1] = '\0';
  strcatm(buf, buf, buf, buf);

producing a string of 16 'x's

  strcatm(..., NULL);

and it's 8 x/s, not 16. Also fix , to ; in the second for loop.

strcatm is the convenience macro that adds a last NULL arg. And it's 16, because it doubles each time. Already fixed.

strcatm - aye, missed that, but I must insist on 8.

Right, 8. I miscounted it as 4 loops :)