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.TH UNIFDEF 1
.SH NAME
unifdef \- remove ifdef'ed lines from C code
.SH SYNOPSIS
unifdef [
.B -D 
.I name
][
.B -U 
.I name
][
.B -D 
.I name
][
.B -U 
.I name
][
.B -iD 
.I name
][
.B -iU 
.I name
][
.B -clt
][
.I file
]
.SH DESCRIPTION
.I Unifdef
reads the given file or standard input if not specified and
removes the specified  #ifdef, #ifndef, #else, and #endif lines,
simplifying complex C or C++ code.
Ifdefs not specified on the command line are left untouched.
Only one level of ifdef nesting is processed on each pass.
.PP
The ifdef and ifndef'ed symbols to be removed may be specified with
.BI -D name
and
.BI -U name 
respectively;
.PP
If the
.I -c
flag is specified, then these flags are complemented.
.PP
The
.I -l
option causes the replaced lines to be replaced with blank lines
instead of deleting them.
.PP
.I If the file does not contain C or C++ code the -t
option may be useful to disable comment and quote parsing.
.PP
.I Unifdef's comment and quote parsing maybe confused by comments or incomplete code
removed by ifdefs. Such code can be explicitly ignored using the disabled using
.BI -iD name
and
.BI -iU name
in a similar way to the 
.BI -D name
and
.BI -U name
options above.
.SH DIAGNOSTICS
Inappropriate else or endif.
.br
Premature EOF.
.PP
Exit status is 0 if ifdefs where replaced, 1 if no changes where made, 2 if trouble.
.SH BUGS
Does not deal with ``#if'' lines.
.SH HISTORY
The
.I unifdef
command appeared in BSD 4.3 .