#!/usr/bin/perl
# converts output of BSD tar(1) into GNU tar compatible format
# tries to support localization
# bug reports are welcome!

# Version 0.01 26.07.1999 Dominik Brettnacher <domi@saargate.de>

# we need POSIX::strftime to find out the national abbreviations for
# month names (used by BSD tar)
use POSIX qw(strftime);
for(0..11)
{
	$Month{POSIX::strftime("%b", 0, 0, 0, 1, $_, 0)} = $_ + 1;
}

while(<>)
{
	m/^(.*) (.{6}) ([0-9 ]{2}:\d{2}) (\d{4}) (.*)/ || die "regular expression did not match, please report";
	
	($day,$month) = month_or_mday_first($2);

	printf("%s %i-%02i-%02i %s %s\n",$1,$4,$Month{$month},$day,$3,$5);
}

# BSD tar uses a quite "different" way to output the date, roughly:
# $date = strftime("%c", ...);
# $date = substr($date,4,12) . " " . substr($date,20,4);
# as it uses localization, we must try to find out whether mday is printed
# before or after the month name itself. this seems to be a solution:
sub month_or_mday_first
{
	if($_[0] =~ m/([0-9 ]{2}) (.{3})/)
	{
		return ($1, $2);
	}
	elsif($_[0] =~ m/(.{3}) ([0-9 ]{2})/)
	{
		return ($2, $1);
	}
	else
	{
		die "invalid date format $_[0]";
	}
}