BerkeleyDB

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BerkeleyDB.pod  view on Meta::CPAN

    $hash{"$key\0"} = "$value\0" ;

Similarly the NULL needs to be taken into account when you are considering
the length of existing keys/values.

It would be much better if you could ignore the NULL terminations issue
in the main application code and have a mechanism that automatically
added the terminating NULL to all keys and values whenever you write to
the database and have them removed when you read from the database. As I'm
sure you have already guessed, this is a problem that DBM Filters can
fix very easily.

    use strict ;
    use BerkeleyDB ;

    my %hash ;
    my $filename = "filt.db" ;
    unlink $filename ;

    my $db = tie %hash, 'BerkeleyDB::Hash',

BerkeleyDB.pod.P  view on Meta::CPAN

    $hash{"$key\0"} = "$value\0" ;

Similarly the NULL needs to be taken into account when you are considering
the length of existing keys/values.

It would be much better if you could ignore the NULL terminations issue
in the main application code and have a mechanism that automatically
added the terminating NULL to all keys and values whenever you write to
the database and have them removed when you read from the database. As I'm
sure you have already guessed, this is a problem that DBM Filters can
fix very easily.

## nullFilter

Hopefully the contents of each of the filters should be
self-explanatory. Both "fetch" filters remove the terminating NULL,
and both "store" filters add a terminating NULL.


=head2 Another Example -- Key is a C int.

ppport.h  view on Meta::CPAN

                      "help by submitting a documentation patch";
            }
            print ".\n";
            if ($todo) {
                if ($todo <= $int_min_perl) {
                    print "It may very well be supported all the way back to ",
                          format_version(5.003_07), ".\n";
                }
                else {
                    print "But given the things $f depends on, it's a good",
                          " guess that it isn't\n",
                          "supported prior to ", format_version($todo), ".\n";
                }
            }
        }
    }
    if ($API{$f}{provided}) {
      print "Support needs to be explicitly requested by #define NEED_$f\n",
            "(or #define NEED_${f}_GLOBAL).\n"              if exists $need{$f};
      $info++;
    }

ppport.h  view on Meta::CPAN

#ifndef UV_MAX
#  define UV_MAX                         PERL_ULONG_MAX
#endif

#endif

#ifndef IVSIZE
#  ifdef LONGSIZE
#    define IVSIZE LONGSIZE
#  else
#    define IVSIZE 4 /* A bold guess, but the best we can make. */
#  endif
#endif
#ifndef UVTYPE
#  define UVTYPE                         unsigned IVTYPE
#endif

#ifndef UVSIZE
#  define UVSIZE                         IVSIZE
#endif