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freebsd-ports/sysutils/guitar/scripts/bsdtar2gnutar

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#!/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]";
}
}