25.1 Indentation style

• We recommend using the BSD Kernel Normal Form coding style located at
  http://cvsweb.netbsd.org/bsdweb.cgi/sharesrc/share/misc/style?rev=HEAD&content-type=text/x-cvsweb-markup

• Although KNF is specified for C, it also applies reasonably well to C++ and Tcl. Most of ns already follows KNF and it is also extensively used for the BSD and Linux kernels.

• The high order bit is 8-space indents. Using 8-space indents avoid confusion about what a "tab" character represents. A downside is it makes deeply nested looping structures hard to fit in 80 columns. (Some people consider this a feature. :-)