1#!/usr/bin/perl -w
2#-
3# Copyright (c) 2003 Dag-Erling Coïdan Smørgrav
4# All rights reserved.
5#
6# Redistribution and use in source and binary forms, with or without
7# modification, are permitted provided that the following conditions
8# are met:
9# 1. Redistributions of source code must retain the above copyright
10#    notice, this list of conditions and the following disclaimer
11#    in this position and unchanged.
12# 2. Redistributions in binary form must reproduce the above copyright
13#    notice, this list of conditions and the following disclaimer in the
14#    documentation and/or other materials provided with the distribution.
15# 3. The name of the author may not be used to endorse or promote products
16#    derived from this software without specific prior written permission.
17#
18# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28#
29# $FreeBSD$
30#
31
32use strict;
33use Getopt::Std;
34
35our $opt_b;
36our $opt_v;
37
38sub hcomp($)
39{
40    my $fn = shift;
41
42    local *FILE;
43    my $header;
44
45    warn("$fn\n")
46	if ($opt_v);
47
48    open(FILE, "<", $fn)
49	or die("$fn: $!\n");
50    $header = join('', <FILE>);
51    close(FILE);
52
53    # Remove comments
54    $header =~ s|/\*.*?\*/||gs;
55    $header =~ s|//.*$||gm;
56
57    # Collapse preprocessor directives
58    while ($header =~ s|(\n\#.*?)\\\n|$1|gs) {
59	# nothing
60    }
61
62    # Remove superfluous whitespace
63    $header =~ s|^\s+||s;
64    $header =~ s|^\s+||gm;
65    $header =~ s|\s+$||s;
66    $header =~ s|\s+$||gm;
67    $header =~ s|\n+|\n|gs;
68    $header =~ s|[ \t]+| |gm;
69
70    open(FILE, ">", "$fn.new")
71	or die("$fn.new: $!\n");
72    print(FILE $header);
73    close(FILE);
74
75    rename($fn, "$fn.$opt_b")
76	if defined($opt_b);
77    rename("$fn.new", $fn);
78}
79
80sub usage()
81{
82    print(STDERR "usage: hcomp [-b ext] file ...\n");
83    exit(1);
84}
85
86MAIN:{
87    my %opts;
88    getopts('b:v')
89	or usage();
90    foreach (@ARGV) {
91	hcomp($_);
92    }
93}
94