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: }
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