.TH INDENT 1L
.SH "NAME"
indent \- changes the appearance of a C program by inserting or deleting whitespace.
.SH "SYNOPSIS"
.B "indent "
[options] [input\-files]
.sp
.B "indent "
[options] [single\-input\-file] [\-o output\-file]
.sp
.B "indent "
\-\-version
.SH "DESCRIPTION"
This man page is generated from the file \fIindent.texinfo\fR.
This is Edition of "The \fBindent\fR Manual",
for Indent Version , last updated .
The \fBindent\fR program
can be used to make code easier to read. It can also convert from one
style of writing C to another.
.B indent\fR understands a substantial amount about the syntax of C,
but it also attempts to cope with incomplete and misformed syntax.
In version 1.2 and more recent versions, the GNU style of indenting is
the default.
.SH "OPTIONS"
.TP 4
.B -bad\fR, \fB--blank-lines-after-declarations\fR
Force blank lines after the declarations.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -bap\fR, \fB--blank-lines-after-procedures\fR
Force blank lines after procedure bodies.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -bbb\fR, \fB--blank-lines-before-block-comments\fR
Force blank lines before block comments.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -bbo\fR, \fB--break-before-boolean-operator\fR
Prefer to break long lines before boolean operators.
.br
See \fB\ BREAKING\ LONG\ LINES\fR.
.TP
.B -bc\fR, \fB--blank-lines-after-commas\fR
Force newline after comma in declaration.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -bl\fR, \fB--braces-after-if-line\fR
Put braces on line after \fBif\fR, etc.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -bli\fIn\fB\fR, \fB--brace-indent\fIn\fB\fR
Indent braces \fIn\fR spaces.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -bls\fR, \fB--braces-after-struct-decl-line\fR
Put braces on the line after \fBstruct\fR declaration lines.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -br\fR, \fB--braces-on-if-line\fR
Put braces on line with \fBif\fR, etc.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -brs\fR, \fB--braces-on-struct-decl-line\fR
Put braces on \fBstruct\fR declaration line.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -bs\fR, \fB--Bill-Shannon\fR, \fB--blank-before-sizeof\fR
Put a space between \fBsizeof\fR and its argument.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -c\fIn\fB\fR, \fB--comment-indentation\fIn\fB\fR
Put comments to the right of code in column \fIn\fR.
.br
See \fB\ COMMENTS\fR.
.TP
.B -cbi\fIn\fB\fR, \fB--case-brace-indentation\fIn\fB\fR
Indent braces after a case label N spaces.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -cd\fIn\fB\fR, \fB--declaration-comment-column\fIn\fB\fR
Put comments to the right of the declarations in column \fIn\fR.
.br
See \fB\ COMMENTS\fR.
.TP
.B -cdb\fR, \fB--comment-delimiters-on-blank-lines\fR
Put comment delimiters on blank lines.
.br
See \fB\ COMMENTS\fR.
.TP
.B -cdw\fR, \fB--cuddle-do-while\fR
Cuddle while of \fBdo {} while;\fR and preceeding \`}\'.
.br
See \fB\ COMMENTS\fR.
.TP
.B -ce\fR, \fB--cuddle-else\fR
Cuddle else and preceeding \`}\'.
.br
See \fB\ COMMENTS\fR.
.TP
.B -ci\fIn\fB\fR, \fB--continuation-indentation\fIn\fB\fR
Continuation indent of \fIn\fR spaces.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -cli\fIn\fB\fR, \fB--case-indentation\fIn\fB\fR
Case label indent of \fIn\fR spaces.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -cp\fIn\fB\fR, \fB--else-endif-column\fIn\fB\fR
Put comments to the right of \fB#else\fR and \fB
#endif\fR statements in column \fIn\fR.
.br
See \fB\ COMMENTS\fR.
.TP
.B -cs\fR, \fB--space-after-cast\fR
Put a space after a cast operator.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -d\fIn\fB\fR, \fB--line-comments-indentation\fIn\fB\fR
Set indentation of comments not to the right
of code to \fIn\fR spaces.
.br
See \fB\ COMMENTS\fR.
.TP
.B -bfda\fR, \fB--break-function-decl-args\fR
Break the line before all arguments in a declaration.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -bfde\fR, \fB--break-function-decl-args\fR
Break the line after the last argument in a declaration.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -di\fIn\fB\fR, \fB--declaration-indentation\fIn\fB\fR
Put variables in column \fIn\fR.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -fc1\fR, \fB--format-first-column-comments\fR
Format comments in the first column.
.br
See \fB\ COMMENTS\fR.
.TP
.B -fca\fR, \fB--format-all-comments\fR
Do not disable all formatting of comments.
.br
See \fB\ COMMENTS\fR.
.TP
.B -gnu\fR, \fB--gnu-style\fR
Use GNU coding style. This is the default.
.br
See \fB\ COMMON\ STYLES\fR.
.TP
.B -hnl\fR, \fB--honour-newlines\fR
Prefer to break long lines at the position of newlines in the input.
.br
See \fB\ BREAKING\ LONG\ LINES\fR.
.TP
.B -i\fIn\fB\fR, \fB--indent-level\fIn\fB\fR
Set indentation level to \fIn\fR spaces.
.br
See \fB\ INDENTATION\fR.
.TP
.B -ip\fIn\fB\fR, \fB--parameter-indentation\fIn\fB\fR
Indent parameter types in old-style function
definitions by \fIn\fR spaces.
.br
See \fB\ INDENTATION\fR.
.TP
.B -kr\fR, \fB--k-and-r-style\fR
Use Kernighan & Ritchie coding style.
.br
See \fB\ COMMON\ STYLES\fR.
.TP
.B -l\fIn\fB\fR, \fB--line-length\fIn\fB\fR
Set maximum line length for non-comment lines to \fIn\fR.
.br
See \fB\ BREAKING\ LONG\ LINES\fR.
.TP
.B -lc\fIn\fB\fR, \fB--comment-line-length\fIn\fB\fR
Set maximum line length for comment formatting to \fIn\fR.
.br
See \fB\ COMMENTS\fR.
.TP
.B -lp\fR, \fB--continue-at-parentheses\fR
Line up continued lines at parentheses.
.br
See \fB\ INDENTATION\fR.
.TP
.B -lps\fR, \fB--leave-preprocessor-space\fR
Leave space between \`#\' and preprocessor directive.
.br
See \fB\ INDENTATION\fR.
.TP
.B -nbad\fR, \fB--no-blank-lines-after-declarations\fR
Do not force blank lines after declarations.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -nbap\fR, \fB--no-blank-lines-after-procedures\fR
Do not force blank lines after procedure bodies.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -nbbo\fR, \fB--break-after-boolean-operator\fR
Do not prefer to break long lines before boolean operators.
.br
See \fB\ BREAKING\ LONG\ LINES\fR.
.TP
.B -nbc\fR, \fB--no-blank-lines-after-commas\fR
Do not force newlines after commas in declarations.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -nbfda\fR, \fB--dont-break-function-decl-args\fR
Don\'t put each argument in a function declaration on a seperate line.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -ncdb\fR, \fB--no-comment-delimiters-on-blank-lines\fR
Do not put comment delimiters on blank lines.
.br
See \fB\ COMMENTS\fR.
.TP
.B -ncdw\fR, \fB--dont-cuddle-do-while\fR
Do not cuddle \fB}\fR and the \fBwhile\fR of a \fBdo {} while;\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nce\fR, \fB--dont-cuddle-else\fR
Do not cuddle \fB}\fR and \fBelse\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -ncs\fR, \fB--no-space-after-casts\fR
Do not put a space after cast operators.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nfc1\fR, \fB--dont-format-first-column-comments\fR
Do not format comments in the first column as normal.
.br
See \fB\ COMMENTS\fR.
.TP
.B -nfca\fR, \fB--dont-format-comments\fR
Do not format any comments.
.br
See \fB\ COMMENTS\fR.
.TP
.B -nhnl\fR, \fB--ignore-newlines\fR
Do not prefer to break long lines at the position of newlines in the input.
.br
See \fB\ BREAKING\ LONG\ LINES\fR.
.TP
.B -nip\fR, \fB--no-parameter-indentation\fR
Zero width indentation for parameters.
.br
See \fB\ INDENTATION\fR.
.TP
.B -nlp\fR, \fB--dont-line-up-parentheses\fR
Do not line up parentheses.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -npcs\fR, \fB--no-space-after-function-call-names\fR
Do not put space after the function in function calls.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nprs\fR, \fB--no-space-after-parentheses\fR
Do not put a space after every \'(\' and before every \')\'.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -npsl\fR, \fB--dont-break-procedure-type\fR
Put the type of a procedure on the same line as its name.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -nsaf\fR, \fB--no-space-after-for\fR
Do not put a space after every \fBfor\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nsai\fR, \fB--no-space-after-if\fR
Do not put a space after every \fBif\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nsaw\fR, \fB--no-space-after-while\fR
Do not put a space after every \fBwhile\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nsc\fR, \fB--dont-star-comments\fR
Do not put the \`*\' character at the left of comments.
.br
See \fB\ COMMENTS\fR.
.TP
.B -nsob\fR, \fB--leave-optional-blank-lines\fR
Do not swallow optional blank lines.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -nss\fR, \fB--dont-space-special-semicolon\fR
Do not force a space before the semicolon after certain statements.
Disables \`-ss\'.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -nut\fR, \fB--no-tabs\fR
Use spaces instead of tabs.
.br
See \fB\ INDENTATION\fR.
.TP
.B -nv\fR, \fB--no-verbosity\fR
Disable verbose mode.
.br
See \fB\ MISCELLANEOUS\ OPTIONS\fR.
.TP
.B -orig\fR, \fB--original\fR
Use the original Berkeley coding style.
.br
See \fB\ COMMON\ STYLES\fR.
.TP
.B -npro\fR, \fB--ignore-profile\fR
Do not read \`.indent.pro\' files.
.br
See \fB\ INVOKING\ INDENT\fR.
.TP
.B -pcs\fR, \fB--space-after-procedure-calls\fR
Insert a space between the name of the
procedure being called and the \`(\'.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -pi\fIn\fB\fR, \fB--paren-indentation\fIn\fB\fR
Specify the extra indentation per open parentheses \'(\' when a
statement is broken.See \fB\ STATEMENTS\fR.
.TP
.B -pmt\fR, \fB--preserve-mtime\fR
Preserve access and modification times on output files.See \fB\ MISCELLANEOUS\ OPTIONS\fR.
.TP
.B -prs\fR, \fB--space-after-parentheses\fR
Put a space after every \'(\' and before every \')\'.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -psl\fR, \fB--procnames-start-lines\fR
Put the type of a procedure on the line before its name.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -saf\fR, \fB--space-after-for\fR
Put a space after each \fBfor\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -sai\fR, \fB--space-after-if\fR
Put a space after each \fBif\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -saw\fR, \fB--space-after-while\fR
Put a space after each \fBwhile\fR.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -sbi\fIn\fB\fR, \fB--struct-brace-indentation\fIn\fB\fR
Indent braces of a struct, union or enum N spaces.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -sc\fR, \fB--start-left-side-of-comments\fR
Put the \`*\' character at the left of comments.
.br
See \fB\ COMMENTS\fR.
.TP
.B -sob\fR, \fB--swallow-optional-blank-lines\fR
Swallow optional blank lines.
.br
See \fB\ BLANK\ LINES\fR.
.TP
.B -ss\fR, \fB--space-special-semicolon\fR
On one-line \fBfor\fR and \fBwhile\fR statments,
force a blank before the semicolon.
.br
See \fB\ STATEMENTS\fR.
.TP
.B -st\fR, \fB--standard-output\fR
Write to standard output.
.br
See \fB\ INVOKING\ INDENT\fR.
.TP
.B -T\fR
Tell \fBindent\fR the name of typenames.
.br
See \fB\ DECLARATIONS\fR.
.TP
.B -ts\fIn\fB\fR, \fB--tab-size\fIn\fB\fR
Set tab size to \fIn\fR spaces.
.br
See \fB\ INDENTATION\fR.
.TP
.B -ut\fR, \fB--use-tabs\fR
Use tabs. This is the default.
.br
See \fB\ INDENTATION\fR.
.TP
.B -v\fR, \fB--verbose\fR
Enable verbose mode.
.br
See \fB\ MISCELLANEOUS\ OPTIONS\fR.
.TP
.B -version\fR
Output the version number of \fBindent\fR.
.br
See \fB\ MISCELLANEOUS\ OPTIONS\fR.
.SH "INVOKING INDENT"
As of version 1.3, the format of the \fBindent\fR command is:
.in +5
.nf
.na
indent [\fIoptions\fR] [\fIinput-files\fR]
indent [\fIoptions\fR] [\fIsingle-input-file\fR] [-o \fIoutput-file\fR]
.in -5
.ad
.fi
This format is different from earlier versions and other versions of
.B indent\fR.
In the first form, one or more input files are specified. \fBindent\fR
makes a backup copy of each file, and the original file is replaced with
its indented version. See \fBBACKUP\ FILES\fR, for an explanation of how
backups are made.
In the second form, only one input file is specified. In this case, or
when the standard input is used, you may specify an output file after
the \`-o\' option.
To cause \fBindent\fR to write to standard output, use the \`-st\'
option. This is only allowed when there is only one input file, or when
the standard input is used.
If no input files are named, the standard input is read for input.
Also, if a filename named \`-\' is specified, then the standard input
is read.
As an example, each of the following commands will input the program
\`slithy_toves.c\' and write its indented text to
\`slithy_toves.out\':
.in +5
.nf
.na
indent slithy_toves.c -o slithy_toves.out
indent -st slithy_toves.c > slithy_toves.out
cat slithy_toves.c | indent -o slithy_toves.out
.in -5
.ad
.fi
Most other options to \fBindent\fR control how programs are formatted.
As of version 1.2, \fBindent\fR also recognizes a long name for each
option name. Long options are prefixed by either \`--\' or
\`+\'.
[ \`+\' is being superseded by \`--\' to
maintain consistency with the POSIX standard.]
In most of this document,
the traditional, short names are used for the sake of brevity.
See \fBOPTION\ SUMMARY\fR, for a list of options, including both long and
short names.
Here is another example:
.in +5
.nf
.na
indent -br test/metabolism.c -l85
.in -5
.ad
.fi
This will indent the program \`test/metabolism.c\' using the
\`-br\' and \`-l85\' options, write the output back to
\`test/metabolism.c\', and write the original contents of
\`test/metabolism.c\' to a backup file in the directory \`test\'.
Equivalent invocations using long option names for this example would
be:
.in +5
.nf
.na
indent --braces-on-if-line --line-length185 test/metabolism.c
indent +braces-on-if-line +line-length185 test/metabolism.c
.in -5
.ad
.fi
If you find that you often use \fBindent\fR with the same options, you
may put those options into a file named \`.indent.pro\'.
.B indent\fR will look for a profile file in three places. First it will check
the environment variable \fBINDENT_PROFILE\fR. If that exists its value
is expected to name the file that is to be used. If the environment variable does
not exist, indent looks for \`.indent.pro\' in the current directory
and use that if found. Finally \fBindent\fR will search
your home directory for \`.indent.pro\' and use that file if it is
found. This behaviour is different from that of other versions of
.B indent\fR, which load both files if they both exist.
The format of \`.indent.pro\' is simply a list of options, just as
they would appear on the command line, separated by white space (tabs,
spaces, and newlines). Options in \`.indent.pro\' may be surrounded by C
or C++ comments, in which case they are ignored.
Command line switches are handled \fIafter\fR processing
\`.indent.pro\'. Options specified later override arguments
specified earlier, with one exception: Explicitly specified options
always override background options (See \fBCOMMON\ STYLES\fR). You can
prevent \fBindent\fR from reading an \`.indent.pro\' file by
specifying the \`-npro\' option.
.SH "BACKUP FILES"
As of version 1.3, GNU \fBindent\fR makes GNU-style backup files, the
same way GNU Emacs does. This means that either \fIsimple\fR or
.I numbered\fR backup filenames may be made.
Simple backup file names are generated by appending a suffix to the
original file name. The default for this suffix is the
one-character string \`~\' (tilde). Thus, the backup file for
\`python.c\' would be \`python.c~\'.
Instead of the default, you may specify any string as a suffix by
setting the environment variable \fBSIMPLE_BACKUP_SUFFIX\fR to
your preferred suffix.
Numbered backup versions of a file \`momeraths.c\' look like
\`momeraths.c.~23~\', where 23 is the version of this particular
backup. When making a numbered backup of the file \`src/momeraths.c\',
the backup file will be named \`src/momeraths.c.~\fIV\fR~\', where
.I V\fR is one greater than the highest version currently existing in
the directory \`src\'. The environment variable \fBVERSION_WIDTH\fR
controls the number of digits, using left zero padding when necessary.
For instance, setting this variable to "2" will lead to the backup
file being named \`momeraths.c.~04~\'.
The type of backup file made is controlled by the value of the
environment variable \fBVERSION_CONTROL\fR. If it is the string
\`simple\', then only simple backups will be made. If its value is
the string \`numbered\', then numbered backups will be made. If its
value is \`numbered-existing\', then numbered backups will be made if
there \fIalready exist\fR numbered backups for the file being indented;
otherwise, a simple backup is made. If \fBVERSION_CONTROL\fR is not
set, then \fBindent\fR assumes the behaviour of
\`numbered-existing\'.
Other versions of \fBindent\fR use the suffix \`.BAK\' in naming
backup files. This behaviour can be emulated by setting
.B SIMPLE_BACKUP_SUFFIX\fR to \`.BAK\'.
Note also that other versions of \fBindent\fR make backups in the
current directory, rather than in the directory of the source file as
GNU \fBindent\fR now does.
.SH "COMMON STYLES"
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 \fIbackground\fR 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 \fBindent\fR 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:
.in +5
.nf
.na
-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
.in -5
.ad
.fi
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:
.in +5
.nf
.na
-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
.in -5
.ad
.fi
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 \fBindent\fR has arbitrarily
chosen column 33.
The style of the original Berkeley \fBindent\fR may be obtained by
specifying \`-orig\' (or by specifying \`--original\', using the
long option name). This style is equivalent to the following settings:
.in +5
.nf
.na
-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
.in -5
.ad
.fi
.SH "BLANK LINES"
Various programming styles use blank lines in different places.
.B indent\fR has a number of options to insert or delete blank lines in
specific places.
The \`-bad\' option causes \fBindent\fR to force a blank line after
every block of declarations. The \`-nbad\' option causes
.B indent\fR not to force such blank lines.
The \`-bap\' option forces a blank line after every procedure body.
The \`-nbap\' option forces no such blank line.
The \`-bbb\' option forces a blank line before every boxed comment
(See \fBCOMMENTS\fR.)
The \`-nbbb\' option does not force such blank lines.
The \`-sob\' option causes \fBindent\fR to swallow optional blank
lines (that is, any optional blank lines present in the input will be
removed from the output). If the \`-nsob\' is specified, any blank
lines present in the input file will be copied to the output file.
.SH "--blank-lines-after-declarations"
The \`-bad\' option forces a blank line after every block of
declarations. The \`-nbad\' option does not add any such blank
lines.
For example, given the input
.in +5
.nf
.na
char *foo;
char *bar;
/* This separates blocks of declarations. */
int baz;
.in -5
.ad
.fi
.B indent -bad\fR produces
.in +5
.nf
.na
char *foo;
char *bar;
/* This separates blocks of declarations. */
int baz;
.in -5
.ad
.fi
and \fBindent -nbad\fR produces
.in +5
.nf
.na
char *foo;
char *bar;
/* This separates blocks of declarations. */
int baz;
.in -5
.ad
.fi
.SH "--blank-lines-after-procedures"
The \`-bap\' option forces a blank line after every procedure body.
For example, given the input
.in +5
.nf
.na
int
foo ()
{
puts("Hi");
}
/* The procedure bar is even less interesting. */
char *
bar ()
{
puts("Hello");
}
.in -5
.ad
.fi
.B indent -bap\fR produces
.in +5
.nf
.na
int
foo ()
{
puts ("Hi");
}
/* The procedure bar is even less interesting. */
char *
bar ()
{
puts ("Hello");
}
.in -5
.ad
.fi
and \fBindent -nbap\fR produces
.in +5
.nf
.na
int
foo ()
{
puts ("Hi");
}
/* The procedure bar is even less interesting. */
char *
bar ()
{
puts ("Hello");
}
.in -5
.ad
.fi
No blank line will be added after the procedure \fBfoo\fR.
.SH "COMMENTS"
.B indent\fR formats both C and C++ comments. C comments are begun with
\`/*\', terminated with \`*/\' and may contain newline characters.
C++ comments begin with the delimiter \`//\' and end at the newline.
.B indent\fR handles comments differently depending upon their context.
.B indent\fR attempts to distinguish between comments which follow
statements, comments which follow declarations, comments following
preprocessor directives, and comments which are not preceded by code of
any sort, i.e., they begin the text of the line (although not
neccessarily in column 1).
.B indent\fR further distinguishes between comments found outside of
procedures and aggregates, and those found within them. In particular,
comments beginning a line found within a procedure will be indented to
the column at which code is currently indented. The exception to this a
comment beginning in the leftmost column; such a comment is output
at that column.
.B indent\fR attempts to leave \fIboxed comments\fR unmodified. The
general idea of such a comment is that it is enclosed in a rectangle or
\`\`box\'\' of stars or dashes to visually set it apart. More precisely,
boxed comments are defined as those in which the initial \`/*\' is
followed immediately by the character \`*\', \`=\', \`_\', or
\`-\', or those in which the beginning comment delimiter (\`/*\')
is on a line by itself, and the following line begins with a \`*\' in
the same column as the star of the opening delimiter.
Examples of boxed comments are:
.in +5
.nf
.na
/**********************
* Comment in a box!! *
**********************/
/*
* A different kind of scent,
* for a different kind of comment.
*/
.in -5
.ad
.fi
.B indent\fR attempts to leave boxed comments exactly as they are found
in the source file. Thus the indentation of the comment is unchanged,
and its length is not checked in any way. The only alteration made is
that an embedded tab character may be converted into the appropriate
number of spaces.
If the \`-bbb\' option is specified, all such boxed comments will be
preceded by a blank line, unless such a comment is preceded by code.
Comments which are not boxed comments may be formatted, which means that
the line is broken to fit within a right margin and left-filled with
whitespace. Single newlines are equivalent to a space, but blank lines
(two or more newlines in a row) are taken to mean a paragraph break.
Formatting of comments which begin after the first column is enabled
with the \`-fca\' option. To format those beginning in column one,
specify \`-fc1\'. Such formatting is disabled by default.
The right margin for formatting defaults to 78, but may be changed with
the \`-lc\' option. If the margin specified does not allow the
comment to be printed, the margin will be automatically extended for the
duration of that comment. The margin is not respected if the comment is
not being formatted.
If the comment begins a line (i.e., there is no program text to its
left), it will be indented to the column it was found in unless the
comment is within a block of code. In that case, such a comment will be
aligned with the indented code of that block (unless the comment began
in the first column). This alignment may be affected by the \`-d\'
option, which specifies an amount by which such comments are moved to
the \fIleft\fR, or unindented. For example, \`-d2\' places comments
two spaces to the left of code. By default, comments are aligned with
code, unless they begin in the first column, in which case they are left
there by default --- to get them aligned with the code, specify \`-fc1\'.
Comments to the right of code will appear by default in column 33.
This may be changed with one of three options. \`-c\' will specify
the column for comments following code, \`-cd\' specifies the
column for comments following declarations, and \`-cp\' specifies
the column for comments following preprocessor directives \fB#else\fR
and \fB#endif\fR.
If the code to the left of the comment exceeds the beginning column,
the comment column will be extended to the next tabstop column past
the end of the code, or in the case of preprocessor directives, to one
space past the end of the directive. This extension lasts only for
the output of that particular comment.
The \`-cdb\' option places the comment delimiters on blank lines.
Thus, a single line comment like \fB/* Loving hug */\fR can be
transformed into:
.in +5
.nf
.na
/*
Loving hug
*/
.in -5
.ad
.fi
Stars can be placed at the beginning of multi-line comments with the
\`-sc\' option. Thus, the single-line comment above can be
transformed (with \`-cdb -sc\') into:
.in +5
.nf
.na
/*
* Loving hug
*/
.in -5
.ad
.fi
.SH "STATEMENTS"
The \`-br\' or \`-bl\' option specifies how to format braces.
The \`-br\' option formats statement braces like this:
.in +5
.nf
.na
if (x > 0) {
x--;
}
.in -5
.ad
.fi
The \`-bl\' option formats them like this:
.in +5
.nf
.na
if (x > 0)
{
x--;
}
.in -5
.ad
.fi
If you use the \`-bl\' option, you may also want to specify the
\`-bli\' option. This option specifies the number of spaces by
which braces are indented. \`-bli2\', the default, gives the
result shown above. \`-bli0\' results in the following:
.in +5
.nf
.na
if (x > 0)
{
x--;
}
.in -5
.ad
.fi
If you are using the \`-br\' option, you probably want to also use
the \`-ce\' option. This causes the \fBelse\fR in an if-then-else
construct to cuddle up to the immediately preceding \`}\'. For
example, with \`-br -ce\' you get the following:
.in +5
.nf
.na
if (x > 0) {
x--;
} else {
fprintf (stderr, "...something wrong?\\n");
}
.in -5
.ad
.fi
With \`-br -nce\' that code would appear as
.in +5
.nf
.na
if (x > 0) {
x--;
}
else {
fprintf (stderr, "...something wrong?\\n");
}
.in -5
.ad
.fi
This causes the \fBwhile\fR in a do-while
loop to cuddle up to the immediately preceding \`}\'. For
example, with \`-cdw\' you get the following:
.in +5
.nf
.na
do {
x--;
} while (x);
.in -5
.ad
.fi
With \`-ncdw\' that code would appear as
.in +5
.nf
.na
do {
x--;
}
while (x);
.in -5
.ad
.fi
The \`-cli\' option specifies the number of spaces that case labels
should be indented to the right of the containing \fBswitch\fR
statement.
The default gives code like:
.in +5
.nf
.na
switch (i)
{
case 0:
break;
case 1:
{
++i;
}
default:
break;
}
.in -5
.ad
.fi
Using the \`-cli2\' that would become:
.in +5
.nf
.na
switch (i)
{
case 0:
break;
case 1:
{
++i;
}
default:
break;
}
.in -5
.ad
.fi
The indentation of the braces below a case statement can be
controlled with the \`-cbi\fIn\fR\' option. For example,
using \`-cli2 -cbi0\' results in:
.in +5
.nf
.na
switch (i)
{
case 0:
break;
case 1:
{
++i;
}
default:
break;
}
.in -5
.ad
.fi
If a semicolon is on the same line as a \fBfor\fR or \fBwhile\fR
statement, the \`-ss\' option will cause a space to be placed before
the semicolon. This emphasizes the semicolon, making it clear that the
body of the \fBfor\fR or \fBwhile\fR statement is an empty statement.
\`-nss\' disables this feature.
The \`-pcs\' option causes a space to be placed between the name of
the procedure being called and the \`(\' (for example, \fBputs\ ("Hi");\fR. The \`-npcs\' option would give \fBputs("Hi");\fR).
If the \`-cs\' option is specified, \fBindent\fR puts a space after
a cast operator.
The \`-bs\' option ensures that there is a space between the
keyword \fBsizeof\fR and its argument. In some versions, this is
known as the \`Bill_Shannon\' option.
The \`-saf\' option forces a space between an \fBfor\fR
and the following parenthesis. This is the default.
The \`-sai\' option forces a space between an \fBif\fR
and the following parenthesis. This is the default.
The \`-saw\' option forces a space between an \fBwhile\fR
and the following parenthesis. This is the default.
The \`-prs\' option causes all parentheses to be seperated with
a space from the what is between them. For example, using \`-prs\'
results in code like:
.in +5
.nf
.na
while ( ( e_code - s_code ) < ( dec_ind - 1 ) )
{
set_buf_break ( bb_dec_ind );
*e_code++ = \' \';
}
.in -5
.ad
.fi
.SH "DECLARATIONS"
By default \fBindent\fR will line up identifiers, in the column
specified by the \`-di\' option. For example, \`-di16\' makes
things look like:
.in +5
.nf
.na
int foo;
char *bar;
.in -5
.ad
.fi
Using a small value (such as one or two) for the \`-di\' option can
be used to cause the identifiers to be placed in the first available
position; for example:
.in +5
.nf
.na
int foo;
char *bar;
.in -5
.ad
.fi
The value given to the \`-di\' option will still affect variables
which are put on separate lines from their types, for example
\`-di2\' will lead to:
.in +5
.nf
.na
int
foo;
.in -5
.ad
.fi
If the \`-bc\' option is specified, a newline is forced after each
comma in a declaration. For example,
.in +5
.nf
.na
int a,
b,
c;
.in -5
.ad
.fi
With the \`-nbc\' option this would look like
.in +5
.nf
.na
int a, b, c;
.in -5
.ad
.fi
The \`-bfda\' option causes a newline to be forced after the comma
separating the arguments of a function declaration. The arguments will
appear at one indention level deeper than the function declaration. This
is particularly helpful for functions with long argument lists.
The option \`-bfde\' causes a newline to be forced before the closing
bracket of the function declaration. For both options the \'n\' setting is the default:
-nbdfa and -nbdfe.
For
example,
.in +5
.nf
.na
void foo (int arg1, char arg2, int *arg3, long arg4, char arg5);
.in -5
.ad
.fi
With the \`-bfda\' option this would look like
.in +5
.nf
.na
void foo (
int arg1,
char arg2,
int *arg3,
long arg4,
char arg5);
.in -5
.ad
.fi
With, in addition, the \`-bfde\' option this would look like
.in +5
.nf
.na
void foo (
int arg1,
char arg2,
int *arg3,
long arg4,
char arg5
);
.in -5
.ad
.fi
The \`-psl\' option causes the type of a procedure being defined to
be placed on the line before the name of the procedure. This style is
required for the \fBetags\fR program to work correctly, as well as some
of the \fBc-mode\fR functions of Emacs.
You must use the \`-T\'
option to tell \fBindent\fR the name of all the typenames in your
program that are defined by \fBtypedef\fR. \`-T\' can be specified
more than once, and all names specified are used. For example, if your
program contains
.in +5
.nf
.na
typedef unsigned long CODE_ADDR;
typedef enum {red, blue, green} COLOR;
.in -5
.ad
.fi
you would use the options \`-T CODE_ADDR -T COLOR\'.
The \`-brs\' or \`-bls\' option specifies how to format braces
in struct declarations. The \`-brs\' option formats braces like
this:
.in +5
.nf
.na
struct foo {
int x;
};
.in -5
.ad
.fi
The \`-bls\' option formats them like this:
.in +5
.nf
.na
struct foo
{
int x;
};
.in -5
.ad
.fi
.SH "INDENTATION"
One issue in the formatting of code is how far each line should be
indented from the left margin. When the beginning of a statement such
as \fBif\fR or \fBfor\fR is encountered, the indentation level is
increased by the value specified by the \`-i\' option. For example,
use \`-i8\' to specify an eight character indentation for each
level. When a statement is broken across two lines, the second line is
indented by a number of additional spaces specified by the \`-ci\'
option. \`-ci\' defaults to 0. However, if the \`-lp\' option is
specified, and a line has a left parenthesis which is not closed on that
line, then continuation lines will be lined up to start at the character
position just after the left parenthesis. This processing also applies
to \`[\' and applies to \`{\' when it occurs in initialization
lists. For example, a piece of continued code might look like this with
\`-nlp -ci3\' in effect:
.in +5
.nf
.na
p1 = first_procedure (second_procedure (p2, p3),
third_procedure (p4, p5));
.in -5
.ad
.fi
With \`-lp\' in effect the code looks somewhat clearer:
.in +5
.nf
.na
p1 = first_procedure (second_procedure (p2, p3),
third_procedure (p4, p5));
.in -5
.ad
.fi
When a statement is broken in between two or more paren pairs (...),
each extra pair causes the indentation level extra indentation:
.in +5
.nf
.na
if ((((i < 2 &&
k > 0) || p == 0) &&
q == 1) ||
n = 0)
.in -5
.ad
.fi
The option \`-ip\fIN\fR\' can be used to set the extra offset per paren.
For instance, \`-ip0\' would format the above as:
.in +5
.nf
.na
if ((((i < 2 &&
k > 0) || p == 0) &&
q == 1) ||
n = 0)
.in -5
.ad
.fi
.B indent\fR assumes that tabs are placed at regular intervals of both
input and output character streams. These intervals are by default 8
columns wide, but (as of version 1.2) may be changed by the \`-ts\'
option. Tabs are treated as the equivalent number of spaces.
The indentation of type declarations in old-style function definitions
is controlled by the \`-ip\' parameter. This is a numeric parameter
specifying how many spaces to indent type declarations. For example,
the default \`-ip5\' makes definitions look like this:
.in +5
.nf
.na
char *
create_world (x, y, scale)
int x;
int y;
float scale;
{
. . .
}
.in -5
.ad
.fi
For compatibility with other versions of indent, the option \`-nip\'
is provided, which is equivalent to \`-ip0\'.
ANSI C allows white space to be placed on preprocessor command lines
between the character \`#\' and the command name. By default,
.B indent\fR removes this space, but specifying the \`-lps\' option
directs \fBindent\fR to leave this space unmodified. The option \`-ppi\'
overrides \`-nlps\' and \`-lps\'.
This option can be used to request that preprocessor conditional statements can
be indented by to given number of spaces, for example with the option \`-ppi 3\'
.in +5
.nf
.na
#if X
#if Y
#define Z 1
#else
#define Z 0
#endif
#endif
.in -5
.ad
.fi
becomes
.in +5
.nf
.na
#if X
# if Y
# define Z 1
# else
# define Z 0
# endif
#endif
.in -5
.ad
.fi
.SH "BREAKING LONG LINES"
With the option \`-l\fIn\fR\', or \`--line-length\fIn\fR\', it is
possible to specify the maximum length of a line of C code, not including
possible comments that follow it.
When lines become longer then the specified line length, GNU \fBindent\fR
tries to break the line at a logical place. This is new as of version 2.1
however and not very intelligent or flexible yet.
Currently there are two options that allows one to interfere with the
algorithm that determines where to break a line.
The \`-bbo\' option causes GNU \fBindent\fR to prefer to break
long lines before the boolean operators \fB&&\fR and \fB||\fR. The
\`-nbbo\' option causes GNU \fBindent\fR not have that
preference. For example, the default option \`-bbo\' (together
with \`--line-length60\' and \`--ignore-newlines\') makes code
look like this:
.in +5
.nf
.na
if (mask
&& ((mask[0] == \'\\0\')
|| (mask[1] == \'\\0\'
&& ((mask[0] == \'0\') || (mask[0] == \'*\')))))
.in -5
.ad
.fi
Using the option \`-nbbo\' will make it look like this:
.in +5
.nf
.na
if (mask &&
((mask[0] == \'\\0\') ||
(mask[1] == \'\\0\' &&
((mask[0] == \'0\') || (mask[0] == \'*\')))))
.in -5
.ad
.fi
The default \`-hnl\', however, honours newlines in the input file by
giving them the highest possible priority to break lines at. For example,
when the input file looks like this:
.in +5
.nf
.na
if (mask
&& ((mask[0] == \'\\0\')
|| (mask[1] == \'\\0\' && ((mask[0] == \'0\') || (mask[0] == \'*\')))))
.in -5
.ad
.fi
then using the option \`-hnl\', or \`--honour-newlines\',
together with the previously mentioned \`-nbbo\' and
\`--line-length60\', will cause the output not to be what is given
in the last example but instead will prefer to break at the positions
where the code was broken in the input file:
.in +5
.nf
.na
if (mask
&& ((mask[0] == \'\\0\')
|| (mask[1] == \'\\0\' &&
((mask[0] == \'0\') || (mask[0] == \'*\')))))
.in -5
.ad
.fi
The idea behind this option is that lines which are too long, but are already
broken up, will not be touched by GNU \fBindent\fR. Really messy code
should be run through \fBindent\fR at least once using the
\`--ignore-newlines\' option though.
.SH "DISABLING FORMATTING"
Formatting of C code may be disabled for portions of a program by
embedding special \fIcontrol comments\fR in the program. To turn off
formatting for a section of a program, place the disabling control
comment \fB/* *INDENT-OFF* */\fR on a line by itself just before that
section. Program text scanned after this control comment is output
precisely as input with no modifications until the corresponding
enabling comment is scanned on a line by itself. The disabling control
comment is \fB/* *INDENT-ON* */\fR, and any text following the comment
on the line is also output unformatted. Formatting begins again with
the input line following the enabling control comment.
More precisely, \fBindent\fR does not attempt to verify the closing
delimiter (\fB*/\fR) for these C comments, and any whitespace on the
line is totally transparent.
These control comments also function in their C++ formats, namely
.B // *INDENT-OFF*\fR and \fB// *INDENT-ON*\fR.
It should be noted that the internal state of \fBindent\fR remains
unchanged over the course of the unformatted section. Thus, for
example, turning off formatting in the middle of a function and
continuing it after the end of the function may lead to bizarre
results. It is therefore wise to be somewhat modular in selecting code
to be left unformatted.
As a historical note, some earlier versions of \fBindent\fR produced
error messages beginning with \fB*INDENT**\fR. These versions of
.B indent\fR were written to ignore any input text lines which began
with such error messages. I have removed this incestuous feature from
GNU \fBindent\fR.
.SH "MISCELLANEOUS OPTIONS"
To find out what version of \fBindent\fR you have, use the command
.B indent -version\fR. This will report the version number of
.B indent\fR, without doing any of the normal processing.
The \`-v\' option can be used to turn on verbose mode. When in
verbose mode, \fBindent\fR reports when it splits one line of input
into two more more lines of output, and gives some size statistics at
completion.
The \`-pmt\' option causes \fBindent\fR to preserve the access
and modification times on the output files. Using this option
has the advantage that running indent on all source and header
files in a project won\'t cause \fBmake\fR to rebuild all targets.
This option is only available on Operating Systems that have the
POSIX \fButime(2)\fR function.
.SH "BUGS"
Please report any bugs to bug-indent@gnu.org.
When \fBindent\fR is run twice on a file, with the same profile,
it should \fInever\fR change that file the second time. With the
current design of \fBindent\fR, this can not be guaranteed,
and it has not been extensively tested.
.B indent\fR does not understand C. In some cases this leads to
the inability to join lines. The result is that running a file
through \fBindent\fR is \fIirreversible\fR, even if the used input
file was the result of running \fBindent\fR with a given profile
(\`.indent.pro\').
While an attempt was made to get \fBindent\fR working for C++, it
will not do a good job on any C++ source except the very simplest.
.B indent\fR does not look at the given \`--line-length\' option
when writing comments to the output file. This results often in comments
being put far to the right. In order to prohibit \fBindent\fR from
joining a broken line that has a comment at the end, make sure that the
comments start on the first line of the break.
.B indent\fR does not count lines and comments (see the \`-v\'
option) when \fBindent\fR is turned off with
.B /* *INDENT-OFF* */\fR.
Comments of the form \fB/*UPPERCASE*/\fR are not treated as comment but as an
identifier, causing them to be joined with the next line. This renders
comments of this type useless, unless they are embedded in the code to
begin with.
.SH "COPYRIGHT"
The following copyright notice applies to the \fBindent\fR program.
The copyright and copying permissions for this manual appear near the
beginning of \`indent.texinfo\' and \`indent.info\', and near the
end of \`indent.1\'.
.nf
.na
Copyright (c) 2001 David Ingamells.
Copyright (c) 1999 Carlo Wood.
Copyright (c) 1995, 1996 Joseph Arceneaux.
Copyright (c) 1989, 1992, 1993, 1994, 1995, 1996 Free Software Foundation
Copyright (c) 1985 Sun Microsystems, Inc.
Copyright (c) 1980 The Regents of the University of California.
Copyright (c) 1976 Board of Trustees of the University of Illinois.
All rights reserved.
Redistribution and use in source and binary forms are permitted
provided that the above copyright notice and this paragraph are
duplicated in all such forms and that any documentation,
advertising materials, and other materials related to such
distribution and use acknowledge that the software was developed
by the University of California, Berkeley, the University of Illinois,
Urbana, and Sun Microsystems, Inc. The name of either University
or Sun Microsystems may not be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED \`\`AS IS\'\' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
PURPOSE.
.ad
.fi
.SH "Options\' Cross Key"
Here is a list of options alphabetized by long option, to help you find
the corresponding short option.
.in +5
.nf
.na
--blank-lines-after-commas -bc
--blank-lines-after-declarations -bad
--blank-lines-after-procedures -bap
--blank-lines-before-block-comments -bbb
--braces-after-if-line -bl
--brace-indent -bli
--braces-after-struct-decl-line -bls
--braces-on-if-line -br
--braces-on-struct-decl-line -brs
--break-after-boolean-operator -nbbo
--break-before-boolean-operator -bbo
--break-function-decl-args -bfda
--break-function-decl-args-end -bfde
--case-indentation -cli\fIn\fR
--case-brace-indentation -cbi\fIn\fR
--comment-delimiters-on-blank-lines -cdb
--comment-indentation -c\fIn\fR
--continuation-indentation -ci\fIn\fR
--continue-at-parentheses -lp
--cuddle-do-while -cdw
--cuddle-else -ce
--declaration-comment-column -cd\fIn\fR
--declaration-indentation -di\fIn\fR
--dont-break-function-decl-args -nbfda
--dont-break-function-decl-args-end -nbfde
--dont-break-procedure-type -npsl
--dont-cuddle-do-while -ncdw
--dont-cuddle-else -nce
--dont-format-comments -nfca
--dont-format-first-column-comments -nfc1
--dont-line-up-parentheses -nlp
--dont-space-special-semicolon -nss
--dont-star-comments -nsc
--else-endif-column -cp\fIn\fR
--format-all-comments -fca
--format-first-column-comments -fc1
--gnu-style -gnu
--honour-newlines -hnl
--ignore-newlines -nhnl
--ignore-profile -npro
--indent-level -i\fIn\fR
--k-and-r-style -kr
--leave-optional-blank-lines -nsob
--leave-preprocessor-space -lps
--line-comments-indentation -d\fIn\fR
--line-length -l\fIn\fR
--no-blank-lines-after-commas -nbc
--no-blank-lines-after-declarations -nbad
--no-blank-lines-after-procedures -nbap
--no-blank-lines-before-block-comments -nbbb
--no-comment-delimiters-on-blank-lines -ncdb
--no-space-after-casts -ncs
--no-parameter-indentation -nip
--no-space-after-for -nsaf
--no-space-after-function-call-names -npcs
--no-space-after-if -nsai
--no-space-after-parentheses -nprs
--no-space-after-while -nsaw
--no-tabs -nut
--no-verbosity -nv
--original -orig
--parameter-indentation -ip\fIn\fR
--paren-indentation -pi\fIn\fR
--preserve-mtime -pmt
--procnames-start-lines -psl
--space-after-cast -cs
--space-after-for -saf
--space-after-if -sai
--space-after-parentheses -prs
--space-after-procedure-calls -pcs
--space-after-while -saw
--space-special-semicolon -ss
--standard-output -st
--start-left-side-of-comments -sc
--struct-brace-indentation -sbi\fIn\fR
--swallow-optional-blank-lines -sob
--tab-size -ts\fIn\fR
--use-tabs -ut
--verbose -v
.in -5
.ad
.fi
.SH "RETURN VALUE"
Unknown
.SH FILES
.br
.nf
.\" set tabstop to longest possible filename, plus a wee bit
.ta \w'$HOME/.indent.pro 'u
\fI$HOME/.indent.pro\fR holds default options for indent.
.SH "AUTHORS"
.br
Carlo Wood
.br
Joseph Arceneaux
.br
Jim Kingdon
.br
David Ingamells
.SH "HISTORY"
Derived from the UCB program "indent".
.SH "COPYING"
Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996 Free Software Foundation, Inc.
Copyright (C) 1995, 1996 Joseph Arceneaux.
Copyright (C) 1999 Carlo Wood.
Copyright (C) 2001 David Ingamells.
Permission is granted to make and distribute verbatim copies of
this manual provided the copyright notice and this permission notice
are preserved on all copies.
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