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(indent.info)Common styles

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Common styles
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   There are several common styles of C code, including the GNU style,
the Kernighan & Ritchie style, and the original Berkeley style.  A
style may be selected with a single "background" option, which
specifies a set of values for all other options.  However, explicitly
specified options always override options implied by a background
option.

   As of version 1.2, the default style of GNU `indent' is the GNU
style.  Thus, it is no longer necessary to specify the option `-gnu' to
obtain this format, although doing so will not cause an error.  Option
settings which correspond to the GNU style are:

     -nbad -bap -nbc -bbo -bl -bli2 -bls -ncdb -nce -cp1 -cs -di2
     -ndj -nfc1 -nfca -hnl -i2 -ip5 -lp -pcs -nprs -psl -saf -sai
     -saw -nsc -nsob

   The GNU coding style is that preferred by the GNU project.  It is the
style that the GNU Emacs C mode encourages and which is used in the C
portions of GNU Emacs.  (People interested in writing programs for
Project GNU should get a copy of `The GNU Coding Standards', which also
covers semantic and portability issues such as memory usage, the size
of integers, etc.)

   The Kernighan & Ritchie style is used throughout their well-known
book `The C Programming Language'.  It is enabled with the `-kr'
option.  The Kernighan & Ritchie style corresponds to the following set
of options:

     -nbad -bap -bbo -nbc -br -brs -c33 -cd33 -ncdb -ce -ci4 -cli0
     -cp33 -cs -d0 -di1 -nfc1 -nfca -hnl -i4 -ip0 -l75 -lp -npcs
     -nprs -npsl -saf -sai -saw -nsc -nsob -nss

Kernighan & Ritchie style does not put comments to the right of code in
the same column at all times (nor does it use only one space to the
right of the code), so for this style `indent' has arbitrarily chosen
column 33.

   The style of the original Berkeley `indent' may be obtained by
specifying `-orig' (or by specifying `--original', using the long
option name).  This style is equivalent to the following settings:

     -nbad -nbap -bbo -bc -br -brs -c33 -cd33 -cdb -ce -ci4 -cli0
     -cp33 -di16 -fc1 -fca -hnl -i4 -ip4 -l75 -lp -npcs -nprs -psl
     -saf -sai -saw -sc -nsob -nss -ts8