Perl-Quelltext von getcgivars

Ich habe diesen Quelltext ohne inhaltliche Änderungen übernommen aus dem von Friedemann Wachsmuth übersetzten Werk "CGI leicht gemacht!". 

# Read all CGI vars into an associative array.
# If multiple input fields have the same name, they are concatenated into
#   one array element and delimited with the \0 character (which fails if
#   the input has any \0 characters, very unlikely but conceivably possible).
# Currently only supports Content-Type of application/x-www-form-urlencoded.
sub getcgivars
{
 local($in, %in);
 local($name, $value);
 # First, read entire string of CGI vars into $in
 if ( ($ENV{'REQUEST_METHOD'} eq 'GET') || ($ENV{'REQUEST_METHOD'} eq 'HEAD') )
 {
  $in = $ENV{'QUERY_STRING'};
 }
 elsif ($ENV{'REQUEST_METHOD'} eq 'POST')
 {
  if ($ENV{'CONTENT_TYPE'}=~ m#^application/x-www-form-urlencoded$#i)
  {
   length($ENV{'CONTENT_LENGTH'})
    || &HTMLdie("No Content-Length sent with the POST request.");
   read(STDIN, $in, $ENV{'CONTENT_LENGTH'});
  }
  else {&HTMLdie("Unsupported Content-Type: $ENV{'CONTENT_TYPE'}");}
 }
 else {&HTMLdie("Script was called with unsupported REQUEST_METHOD.");}
 # Resolve and unencode name/value pairs into %in
 foreach (split('&', $in))
 {
  s/\+/ /g;
  ($name, $value)= split('=', $_, 2);
  $name=~ s/%(..)/chr(hex($1))/ge;
  $value=~ s/%(..)/chr(hex($1))/ge;
  $in{$name}.= "\0" if defined($in{$name});  # concatenate multiple vars
  $in{$name}.= $value;
 }
 return %in;
}

Die Funktion HTMLdie 
# Die, outputting HTML error page
# If no $title, use a default title
sub HTMLdie
{
 local($msg,$title)= @_;
 $title || ($title= "CGI Error");
 print <<EOF;
Content-type: text/html

<html>
<head>
 <title>$title</title>
</head>
<body>
<h1>$title</h1>
<h3>$msg</h3>
</body>
</html>
EOF

 exit;
}

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Gerhard Eichelsdörfer