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Annotation of loncom/debugging_tools/excise_from_db.pl, revision 1.2

1.1       matthew     1: #!/usr/bin/perl -w
                      2: #
                      3: # The LearningOnline Network
                      4: #
                      5: # excise_from_db.pl - Remove a key from a db file.
                      6: #
1.2     ! matthew     7: # $Id: excise_from_db.pl,v 1.1 2004/01/27 18:42:25 matthew Exp $
1.1       matthew     8: #
                      9: # Copyright Michigan State University Board of Trustees
                     10: #
                     11: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
                     12: #
                     13: # LON-CAPA is free software; you can redistribute it and/or modify
                     14: # it under the terms of the GNU General Public License as published by
                     15: # the Free Software Foundation; either version 2 of the License, or
                     16: # (at your option) any later version.
                     17: #
                     18: # LON-CAPA is distributed in the hope that it will be useful,
                     19: # but WITHOUT ANY WARRANTY; without even the implied warranty of
                     20: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     21: # GNU General Public License for more details.
                     22: #
                     23: # You should have received a copy of the GNU General Public License
                     24: # along with LON-CAPA; if not, write to the Free Software
                     25: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     26: #
                     27: # /home/httpd/html/adm/gpl.txt
                     28: #
                     29: # http://www.lon-capa.org/
                     30: #
                     31: #################################################
                     32: use strict;
                     33: use GDBM_File;
                     34: 
                     35: #
                     36: # Options
                     37: my $fname = shift;
                     38: my $key = shift;
                     39: 
1.2     ! matthew    40: if (! defined($fname) || ! defined($key)) {
        !            41:     print "Specify db file and key on command line.".$/.
        !            42:         'excise_from_db.pl roles.db "a very long key"'.$/;
        !            43:     exit;
        !            44: }
        !            45: 
1.1       matthew    46: my %db;
                     47: if (! tie(%db,'GDBM_File',$fname,&GDBM_WRITER,0640)) {
                     48:     warn "Unable to tie to $fname";
                     49:     next;
                     50: }
                     51: delete($db{$key});
                     52: delete($db{&escape($key)});
                     53: 
                     54: untie %db;
                     55: 
                     56: exit;
                     57: 
                     58: ######################################
                     59: sub escape {
                     60:     my $str=shift;
                     61:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
                     62:     return $str;
                     63: }
                     64: 
                     65: sub unescape {
                     66:     my $str=shift;
                     67:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
                     68:     return $str;
                     69: }