#!/usr/bin/perl
#
# $Id$
#
# Generate a kernel patch to add socketcan to a kernel src tree.
# The list of files to be added is read from stdin.

use POSIX qw(strftime);

$version = shift;

if (-r "patches/$version.diff") {
    copy_file("patches/$version.diff");
} else {
    die "Patch patches/$version.diff not found";
}

while (<>) {
    next if (/^#/);
    my ($file, $n) = split;
    my ($name);
    if ($n eq "") {
	$name = $file;
    } else {
	$name = $file;
	$name =~ s/[^\/]*$/$n/;
    }
    $name =~ s/[^\/]*\/[^\/]*\///;
    
    add_file($file, $name);
}

sub copy_file {
    my ($file) = @_;

    open file, "$file" || die "open $file\n";
    while (<file>) {
	print;
    }
    close file;
}

sub add_file {
    my ($file, $name) = @_;
    my (@lines, $count, $ts);

    open file, "./strip-src -i -m -v $version $file |" || die "open $file\n";
    @lines = <file>;
    close file;

    $count = $#lines + 1;
    $ts = strftime "%F %T", gmtime((stat($file))[9]);

    print "--- a/$name 1970-01-01 00:00:00\n";
    print "+++ b/$name $ts\n";
    print "@@ -0,0 +1,$count @@\n";
    for (@lines) {
	print "+$_";
    }
}