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Annotation of loncom/debugging_tools/excise_from_db.pl, revision 1.1

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: #
        !             7: # $Id: dump_db.pl,v 1.2 2002/09/04 20:49:16 matthew Exp $
        !             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 $key = shift;
        !            39: 
        !            40: my %db;
        !            41: if (! tie(%db,'GDBM_File',$fname,&GDBM_WRITER,0640)) {
        !            42:     warn "Unable to tie to $fname";
        !            43:     next;
        !            44: }
        !            45: delete($db{$key});
        !            46: delete($db{&escape($key)});
        !            47: 
        !            48: untie %db;
        !            49: 
        !            50: exit;
        !            51: 
        !            52: ######################################
        !            53: sub escape {
        !            54:     my $str=shift;
        !            55:     $str =~ s/(\W)/"%".unpack('H2',$1)/eg;
        !            56:     return $str;
        !            57: }
        !            58: 
        !            59: sub unescape {
        !            60:     my $str=shift;
        !            61:     $str =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
        !            62:     return $str;
        !            63: }