UNIFDEF(1) User Commands UNIFDEF(1)

NAME

unifdef - resolve and remove ifdef'ed lines from C program source

SYNOPSIS

unifdef [-clt] [-Dname] [-Uname] [-iDname] [-iUname] ...
[filename]

DESCRIPTION

unifdef removes ifdefed lines from a file while otherwise leaving the
file alone. It is smart enough to deal with the nested ifdefs,
comments, single and double quotes of C syntax, but it does not do
any including or interpretation of macros. Neither does it strip out
comments, though it recognizes and ignores them. You specify which
symbols you want defined with -D options, and which you want
undefined with -U options. Lines within those ifdefs will be copied
to the output, or removed, as appropriate. Any ifdef, ifndef, else,
and endif lines associated with filename will also be removed.


ifdefs involving symbols you do not specify are untouched and copied
out along with their associated ifdef, else, and endif lines.


If an ifdefX occurs nested inside another ifdefX, then the inside
ifdef is treated as if it were an unrecognized symbol. If the same
symbol appears in more than one argument, only the first occurrence
is significant.


unifdef copies its output to the standard output and will take its
input from the standard input if no filename argument is given.

OPTIONS

The following options are supported:

-c
Complement the normal operation. Lines that would have
been removed or blanked are retained, and vice versa.


-l
Replace ``lines removed'' lines with blank lines.


-t
Plain text option. unifdef refrains from attempting to
recognize comments and single and double quotes.


-Dname
Lines associated with the defined symbol name.


-Uname
Lines associated with the undefined symbol name.


-iDname
Ignore, but print out, lines associated with the defined
symbol name. If you use ifdefs to delimit non-C lines,
such as comments or code which is under construction, then
you must tell unifdef which symbols are used for that
purpose so that it will not try to parse for quotes and
comments within them.


-iUname
Ignore, but print out, lines associated with the undefined
symbol name.

EXIT STATUS

The following exit values are returned:

0
Successful operation.


1
Operation failed.

SEE ALSO

diff(1), attributes(7)

DIAGNOSTICS

Premature EOF
Inappropriate else or endif.


January 14, 1992 UNIFDEF(1)