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File:  [LON-CAPA] / loncom / debugging_tools / excise_from_db.pl
Revision 1.2: download - view: text, annotated - select for diffs
Sat Mar 19 00:39:54 2005 UTC (19 years, 1 month ago) by matthew
Branches: MAIN
CVS tags: version_2_1_X, version_2_1_3, version_2_1_2, version_2_1_1, version_2_1_0, version_2_0_X, version_2_0_99_1, version_2_0_2, version_2_0_1, version_2_0_0, version_1_99_3, version_1_99_2, version_1_99_1_tmcc, version_1_99_1, version_1_99_0_tmcc, version_1_99_0, HEAD
A little error checking.

    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: excise_from_db.pl,v 1.2 2005/03/19 00:39:54 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 $key = shift;
   39: 
   40: if (! defined($fname) || ! defined($key)) {
   41:     print "Specify db file and key on command line.".$/.
   42:         'excise_from_db.pl roles.db "a very long key"'.$/;
   43:     exit;
   44: }
   45: 
   46: my %db;
   47: if (! tie(%db,'GDBM_File',$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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