$input=<STDIN>;                # read form data from stdin
$input =~ s/\s*$//;            # chop trailing CR/LF/space characters:
                               # recall that the data sent by a client
                               # is always terminated by a single line
                               # containing only a CRLF pair. This
                               # must be removed, since it is not
                               # part of the message body.
                               # Check for unencoded equals sign -- if
                               # there are none, the string didn't
if( $input !~ /=/ ) {          # come from a form, which is an error.
    &pk_error("Query String not from form\n");
}
                                   # If we get to here, all is OK. Now
@fields=split("&",$input);         # split data into name=value
                                   # fields(@fields is an array)
 
#   Now loop over each of the entries in the @fields array and break
#   them into the name and value parts. Then decode each part to get
#   back the strings typed into the form by the user

foreach $one (@fields) {
   ($name, $value) = split("=",$one);      # split,at equals sign,into 
                                           # name and value strings. 
                                           # Then decode the strings.
   $name  =~ s/\+/ /g;                     # convert +'s to spaces
   $name  =~ s/%(..)/pack("c",hex($1))/ge; # convert hex to Latin-1
   $value =~ s/\+/ /g;                     # convert +'s to spaces
   $value =~ s/%(..)/pack("c",hex($1))/ge; # convert hex to Latin-1

# What you do now depends on how the program works. If you know that 
# each name is unique (your FORM does not have checkbox or SELECT 
# items that allow multiple name=value strings with the same name) 
# then you can place all the data in an associative array (a useful 
# little perl feature!):

   $array{"$name"} = $value;

#  If your form does have select or <input type=checkbox../> items, 
#  then you'll have to be a bit more careful...

}