revmap #2

eval '(exit $?0)' && eval 'exec perl -S $0 ${1+"$@"}'
  & eval 'exec perl -S $0 $argv:q'
  if 0;
#  THE PRECEEDING STUFF EXECS perl via $PATH
# -*-Fundamental-*-

#  $Id: //guest/robert_cowham/perforce/utils/cvs2p4/bin/revmap#2 $
#
#  Richard Geiger
#

require 5.000;

use bytes;

use Carp; # ...or flounder. (This will fail unless 'perl' is a perl5!)
$| = 1;

($Myname = $0) =~ s%^.*/%%;

$Usage = <<LIT;
$Myname: usage: $Myname [-map <mapfile>] <convdir>
LIT


sub usage
{
  print STDERR $Usage;
  exit 1;
}


sub help
{
  print STDERR <<LIT;
$Usage
$Myname is...
LIT
  exit 1;
}


# option switch variables get defaults here...

$Boolopt = 0;
$Valopt = 0;

$Mapfile = "revmap";

while ($#ARGV >= 0)
  {
    if ($ARGV[0] eq "-boolopt")    { $Boolopt = 1; shift; next; }
    elsif ($ARGV[0] eq "-map")
      {
        shift; if ($ARGV[0] < 0) { &usage; }
        $Mapfile = $ARGV[0]; shift; next;
      }
    elsif ($ARGV[0] eq "-help")
      { &help; }
    elsif ($ARGV[0] =~ /^-/) { &usage; }
    if ($Args ne "") { $Args .= " "; }
    push(@Args, $ARGV[0]);
    shift;
  }

if ($#Args ne 0) { &usage; }

$Convdir = $Args[0];
chdir $Convdir || die "$Myname: can't chdir \"$Convdir\": $!";
$Convdir = `/bin/pwd`; chop $Convdir;
chdir $Here || die "$Myname: can't chdir \"$Here\": $!";

$Revmap   = "$Convdir/$Mapfile";

use DB_File;
$DBMCLASS="DB_File";
$myhashinfo = new DB_File::HASHINFO;
$myhashinfo->{bsize} = 4096;

if (! tie(%REVMAP, $DBMCLASS, $Revmap, O_RDONLY, 0444, $myhashinfo))
  { print "$Myname: can't tie \"$Revmap\": $!\n"; exit 1; }

while (($key,$val) = each %REVMAP)
  {
    if ($Mapfile != "rrevmap") { $val =~ s/\001.*//; }
    print "$key $val\n";
  }

untie %REVMAP;