[topic]
key=value
key=value
...
[topic]
key=value
key=value
...

#/usr/bin/perl

use strict;
use warnings;

return 1;

sub read_ini
{
# reads an ini-file
# returns a hash containing the key-value pairs

my @content;
my %lines;
my $file=shift; # filename
my $name=shift; # name of target topic

open(IN,"<$file") or die "$!";
@content=<IN>;
close(IN);

my $i=0;
my $n=0;
for (@content)
 {
 $i++ if /\[.*?\]/io;
 $n=$i if /\[$name\]/io;
 $lines{"$1"}="$2" if /^(.*?)\=(.*)$/i and $i==$n;
 last if $i>$n;
 }
return %lines;
}


sub change_ini
{
# changes key-value pairs
# returns true when done

my @content;
my %lines;
my $file=shift; # filename
my $name=shift; # name of target topic
my $key=shift;    # target key
my $value=shift; # new value

open(IN,"<$file") or die "$!";
@content=<IN>;
close(IN);

my $i=0;
my $n=0;
for (@content)
 {
 $i++ if /\[.*?\]/io;

 $n=$i if /\[$name\]/io;

 s/(^$key\=)(.*)$/$1$value/i, last if /(^$key\=)(.*)$/i and $i==$n;
 }

open(IN,">$file") or die "$!";
for(@content)
 {
 print IN $_;
 }
close(IN);
return 1;
}

sub ins_item_ini
{
# inserts a new key-value pair
# returns true when done
my @content;
my $file=shift; # filename
my $name=shift; # name of topic
my $new_kv=shift; # something like admin=123456

open(IN,"<$file") or die "$!";
@content=<IN>;
close(IN);

my $i=0;
my $n=0;
open(IN,">$file") or die "$!";
for(@content)
 {
 $i++ if /\[.*?\]/io;
 $n=$i if /\[$name\]/io and $n ne '-';
 if($n eq $i and $n ne '-')
  {
  print IN "$new_kv\n";
  print IN $_;
  $n='-';
  }
  else
  {
  print IN $_;
  }
 }
close(IN);
return 1;
}