Fixed login crash

[squirrelmail.git] / src / compose.php

<?php

   /**
    **  compose.php
    **
    **  Copyright (c) 1999-2001 The SquirrelMail development team
    **  Licensed under the GNU GPL. For full terms see the file COPYING.
    **
    **  This code sends a mail.
    **
    **  There are 4 modes of operation:
    **     - Start new mail
    **     - Add an attachment
    **     - Send mail
    **     - Save As Draft
    **
    **  $Id$
    **/

   require_once('../src/validate.php');
   require_once('../functions/imap.php');
   require_once('../functions/date.php');
   require_once('../functions/mime.php');
   require_once('../functions/smtp.php');
   require_once('../functions/display_messages.php');
   require_once('../functions/plugin.php');

   if (!isset($attachments))
   {
       $attachments = array();
       session_register('attachments');
   }


   // This function is used when not sending or adding attachments
   function newMail () {
      global $forward_id, $imapConnection, $msg, $ent_num, $body_ary, $body,
             $reply_id, $send_to, $send_to_cc, $mailbox, $send_to_bcc, $editor_size,
             $draft_id, $use_signature;

      $send_to = decodeHeader($send_to);
      $send_to_cc = decodeHeader($send_to_cc);
      $send_to_bcc = decodeHeader($send_to_bcc);

      if ($forward_id)
         $id = $forward_id;
      elseif ($reply_id)
         $id = $reply_id;

      if ($draft_id){
         $id = $draft_id;
         $use_signature = FALSE;
      }

      if (isset($id)) {
         sqimap_mailbox_select($imapConnection, $mailbox);
         $message = sqimap_get_message($imapConnection, $id, $mailbox);
         $orig_header = $message->header;
         if ($ent_num)
            $message = getEntity($message, $ent_num);

         if ($message->header->type0 == 'text' || $message->header->type1 == 'message') {
            if ($ent_num)
               $body = decodeBody(mime_fetch_body($imapConnection, $id, $ent_num), $message->header->encoding);
            else
               $body = decodeBody(mime_fetch_body($imapConnection, $id, 1), $message->header->encoding);
         } else {
            $body = "";
         }

         if ($message->header->type1 == "html")
            $body = strip_tags($body);

         sqUnWordWrap($body);
         $body_ary = explode("\n", $body);
         $i = count($body_ary) - 1;
         while ($i >= 0 && ereg("^[>\\s]*$", $body_ary[$i])) {
            unset($body_ary[$i]);
            $i --;
         }
         $body = "";
         for ($i=0; isset($body_ary[$i]); $i++) {
            if ($reply_id)
            {
                if (ereg('^[ >]+', $body_ary[$i]))
                {
                    $body_ary[$i] = '>' . $body_ary[$i];
                }
                else
                {
                    $body_ary[$i] = '> ' . $body_ary[$i];
                }
            }
            if (!$draft_id) {
               sqWordWrap($body_ary[$i], $editor_size - 1);
            }
            $body .= $body_ary[$i] . "\n";
            unset($body_ary[$i]);
         }
         if ($forward_id)
         {
             $bodyTop =  "-------- " . _("Original Message") . " --------\n";
             $bodyTop .= _("Subject") . ": " . $orig_header->subject . "\n";
             $bodyTop .= _("From") . ": " . $orig_header->from . "\n";
             $bodyTop .= _("To") . ": " . $orig_header->to[0] . "\n";
             if (count($orig_header->to) > 1) {
                 for ($x=1; $x < count($orig_header->to); $x++) {
                     $bodyTop .= "         " . $orig_header->to[$x] . "\n";
                 }
             }
             $bodyTop .= "\n";
             $body = $bodyTop . $body;
         } else if ($reply_id) {
             $orig_from = decodeHeader($orig_header->from);
             $orig_from = trim(substr($orig_from,0,strpos($orig_from,'<')));
             $orig_from = str_replace('"','',$orig_from);
             $orig_from = str_replace("'",'',$orig_from);
             $body = getReplyCitation($orig_from) . $body;
         }

         return;
      }

      if (!$send_to) {
         $send_to = sqimap_find_email($send_to);
      }

      /** This formats a CC string if they hit "reply all" **/
      if ($send_to_cc != "") {
         $send_to_cc = ereg_replace( '"[^"]*"', "", $send_to_cc);
         $send_to_cc = ereg_replace(";", ",", $send_to_cc);
         $sendcc = explode(",", $send_to_cc);
         $send_to_cc = "";

         for ($i = 0; $i < count($sendcc); $i++) {
            $sendcc[$i] = trim($sendcc[$i]);
            if ($sendcc[$i] == "")
               continue;

            $sendcc[$i] = sqimap_find_email($sendcc[$i]);
            $whofrom = sqimap_find_displayable_name($msg["HEADER"]["FROM"]);
            $whoreplyto = sqimap_find_email($msg["HEADER"]["REPLYTO"]);

            if ((strtolower(trim($sendcc[$i])) != strtolower(trim($whofrom))) &&
                (strtolower(trim($sendcc[$i])) != strtolower(trim($whoreplyto))) &&
                (trim($sendcc[$i]) != "")) {
               $send_to_cc .= trim($sendcc[$i]) . ", ";
            }
         }
         $send_to_cc = trim($send_to_cc);
         if (substr($send_to_cc, -1) == ",") {
            $send_to_cc = substr($send_to_cc, 0, strlen($send_to_cc) - 1);
         }
      }
   } // function newMail()

   function getAttachments($message) {
      global $mailbox, $attachments, $attachment_dir, $imapConnection,
             $ent_num, $forward_id, $draft_id;
 
     if (isset($draft_id))
         $id = $draft_id;
      else
         $id = $forward_id;

      if (!$message) {
           sqimap_mailbox_select($imapConnection, $mailbox);
           $message = sqimap_get_message($imapConnection, $id,
               $mailbox);
      }

      if (count($message->entities) == 0) {
          if ($message->header->entity_id != $ent_num) {
              $filename = decodeHeader($message->header->filename);

              if ($filename == "")
                  $filename = "untitled-".$message->header->entity_id;

              $localfilename = GenerateRandomString(32, '', 7);
              while (file_exists($attachment_dir . $localfilename))
                  $localfilename = GenerateRandomString(32, '', 7);

              $newAttachment = array();
              $newAttachment['localfilename'] = $localfilename;
              $newAttachment['remotefilename'] = $filename;
              $newAttachment['type'] = strtolower($message->header->type0 .
                 '/' . $message->header->type1);

              // Write Attachment to file
              $fp = fopen ($attachment_dir.$localfilename, 'w');
              fputs ($fp, decodeBody(mime_fetch_body($imapConnection,
                  $id, $message->header->entity_id),
                  $message->header->encoding));
              fclose ($fp);

              $attachments[] = $newAttachment;
          }
      } else {
          for ($i = 0; $i < count($message->entities); $i++) {
              getAttachments($message->entities[$i]);
          }
      }
      return;
   }

   function showInputForm () {
      global $send_to, $send_to_cc, $reply_subj, $forward_subj, $body,
         $passed_body, $color, $use_signature, $signature, $prefix_sig,
         $editor_size, $attachments, $subject, $newmail,
         $use_javascript_addr_book, $send_to_bcc, $reply_id, $mailbox,
         $from_htmladdr_search, $location_of_buttons, $attachment_dir,
         $username, $data_dir, $identity, $draft_id, $delete_draft,
	 $mailprio;

      $subject = decodeHeader($subject);
      $reply_subj = decodeHeader($reply_subj);
      $forward_subj = decodeHeader($forward_subj);

      if ($use_javascript_addr_book) {
         echo "\n<SCRIPT LANGUAGE=JavaScript><!--\n";
         echo "function open_abook() { \n";
         echo "  var nwin = window.open(\"addrbook_popup.php\",\"abookpopup\",";
         echo "\"width=670,height=300,resizable=yes,scrollbars=yes\");\n";
         echo "  if((!nwin.opener) && (document.windows != null))\n";
         echo "    nwin.opener = document.windows;\n";
         echo "}\n";
         echo "// --></SCRIPT>\n\n";
      }

      echo "\n<FORM name=compose action=\"compose.php\" METHOD=POST ENCTYPE=\"multipart/form-data\"";
      do_hook("compose_form");
          echo ">\n";

      if (isset($draft_id)) {
         echo "<input type=\"hidden\" name=\"delete_draft\" value=\"$draft_id\">\n";
      }
      if (isset($delete_draft)) {
         echo "<input type=\"hidden\" name=\"delete_draft\" value=\"$delete_draft\">\n";
      }

      echo "<TABLE WIDTH=\"100%\" ALIGN=center CELLSPACING=0 BORDER=0>\n";

      if ($location_of_buttons == 'top') showComposeButtonRow();

      $idents = getPref($data_dir, $username, 'identities');
      if ($idents != '' && $idents > 1) {
         echo "   <TR>\n";
         echo "      <TD BGCOLOR=\"$color[4]\" WIDTH=\"10%\" ALIGN=RIGHT>\n";
         echo _("From:");
         echo "      </TD><TD BGCOLOR=\"$color[4]\" WIDTH=\"90%\">\n";
         echo "<select name=identity>\n";
         echo "<option value=default>" .
         htmlspecialchars(getPref($data_dir, $username, 'full_name'));
         $em = getPref($data_dir, $username, 'email_address');
         if ($em != '')
            echo htmlspecialchars(' <' . $em . '>') . "\n";
         for ($i = 1; $i < $idents; $i ++) {
            echo '<option value="' . $i . '"';
            if (isset($identity) && $identity == $i)
               echo ' SELECTED';
            echo '>';
            echo htmlspecialchars(getPref($data_dir, $username, 'full_name' .
                                        $i));
            $em = getPref($data_dir, $username, 'email_address' . $i);
            if ($em != '')
               echo htmlspecialchars(' <' . $em . '>') . "\n";
         }
         echo "</select>\n";
         echo "      </TD>\n";
         echo "   </TR>\n";
      }
      echo "   <TR>\n";
      echo "      <TD BGCOLOR=\"$color[4]\" WIDTH=\"10%\" ALIGN=RIGHT>\n";
      echo _("To:");
      echo "      </TD><TD BGCOLOR=\"$color[4]\" WIDTH=\"90%\">\n";
      printf("         <INPUT TYPE=text NAME=\"send_to\" VALUE=\"%s\" SIZE=60><BR>\n",
             htmlspecialchars($send_to));
      echo "      </TD>\n";
      echo "   </TR>\n";
      echo "   <TR>\n";
      echo "      <TD BGCOLOR=\"$color[4]\" ALIGN=RIGHT>\n";
      echo _("CC:");
      echo "      </TD><TD BGCOLOR=\"$color[4]\" ALIGN=LEFT>\n";
      printf("         <INPUT TYPE=text NAME=\"send_to_cc\" SIZE=60 VALUE=\"%s\"><BR>\n",
             htmlspecialchars($send_to_cc));
      echo "      </TD>\n";
      echo "   </TR>\n";
      echo "   <TR>\n";
      echo "      <TD BGCOLOR=\"$color[4]\" ALIGN=RIGHT>\n";
      echo _("BCC:");
      echo "      </TD><TD BGCOLOR=\"$color[4]\" ALIGN=LEFT>\n";
      printf("         <INPUT TYPE=text NAME=\"send_to_bcc\" VALUE=\"%s\" SIZE=60><BR>\n",
             htmlspecialchars($send_to_bcc));
      echo "</TD></TR>\n";

      echo "   <TR>\n";
      echo "      <TD BGCOLOR=\"$color[4]\" ALIGN=RIGHT>\n";
      echo _("Subject:");
      echo "      </TD><TD BGCOLOR=\"$color[4]\" ALIGN=LEFT>\n";
      if ($reply_subj) {
         $reply_subj = str_replace("\"", "'", $reply_subj);
         $reply_subj = trim($reply_subj);
         if (substr(strtolower($reply_subj), 0, 3) != "re:")
            $reply_subj = "Re: $reply_subj";
         printf("         <INPUT TYPE=text NAME=subject SIZE=60 VALUE=\"%s\">",
                htmlspecialchars($reply_subj));
      } else if ($forward_subj) {
         $forward_subj = trim($forward_subj);
         if ((substr(strtolower($forward_subj), 0, 4) != 'fwd:') &&
             (substr(strtolower($forward_subj), 0, 5) != '[fwd:') &&
             (substr(strtolower($forward_subj), 0, 6) != '[ fwd:'))
            $forward_subj = "[Fwd: $forward_subj]";
         printf("         <INPUT TYPE=text NAME=subject SIZE=60 VALUE=\"%s\">",
                htmlspecialchars($forward_subj));
      } else {
          printf("         <INPUT TYPE=text NAME=subject SIZE=60 VALUE=\"%s\">",
                htmlspecialchars($subject));
      }
      echo "</td></tr>\n\n";

      if ($location_of_buttons == 'between') showComposeButtonRow();

      echo "   <TR>\n";
      echo "      <TD BGCOLOR=\"$color[4]\" COLSPAN=2>\n";
      echo "         &nbsp;&nbsp;<TEXTAREA NAME=body ROWS=20 COLS=\"$editor_size\" WRAP=HARD>";
      echo htmlspecialchars($body);
      if ($use_signature == true && $newmail == true && !isset($from_htmladdr_search)) {
        if ( $prefix_sig == true )
          echo "\n\n-- \n" . htmlspecialchars($signature);
        else
          echo "\n\n" . htmlspecialchars($signature);
      }
      echo "</TEXTAREA><BR>\n";
      echo "      </TD>\n";
      echo "   </TR>\n";

      if ($location_of_buttons == 'bottom')
         showComposeButtonRow();
      else {
         echo "   <TR><TD>&nbsp;</TD><TD ALIGN=LEFT><INPUT TYPE=SUBMIT NAME=send VALUE=\""._("Send")."\"></TD></TR>\n";
      }

      // This code is for attachments
      echo "   <tr>\n";
      echo "     <TD BGCOLOR=\"$color[0]\" VALIGN=MIDDLE ALIGN=RIGHT>\n";
      echo        _("Attach:");
      echo "      </td><td ALIGN=left BGCOLOR=\"$color[0]\">\n";
      echo "      <INPUT NAME=\"attachfile\" SIZE=48 TYPE=\"file\">\n";
      echo "      &nbsp;&nbsp;<input type=\"submit\" name=\"attach\"";
      echo " value=\"" . _("Add") ."\">\n";
      echo "     </td>\n";
      echo "   </tr>\n";
      if (count($attachments))
      {
         echo "<tr><td bgcolor=\"$color[0]\" align=right>\n";
         echo "&nbsp;";
         echo "</td><td align=left bgcolor=\"$color[0]\">";
         foreach ($attachments as $key => $info) {
            echo "<input type=\"checkbox\" name=\"delete[]\" value=\"$key\">\n";
            echo $info['remotefilename'] . " - " . $info['type'] . " (";
            echo show_readable_size(filesize($attachment_dir .
                $info['localfilename'])) . ")<br>\n";
         }

         echo "<input type=\"submit\" name=\"do_delete\" value=\""._("Delete selected attachments")."\">\n";
         echo "</td></tr>";
      }
      // End of attachment code

      echo "</TABLE>\n";
      if ($reply_id) {
         echo "<input type=hidden name=reply_id value=$reply_id>\n";
      }
      printf("<INPUT TYPE=hidden NAME=mailbox VALUE=\"%s\">\n", htmlspecialchars($mailbox));      
      echo "</FORM>";
      do_hook("compose_bottom");
      echo "</BODY></HTML>\n";
   }

   function showComposeButtonRow() {
      global $use_javascript_addr_book, $save_as_draft, 
             $default_use_priority, $mailprio;

      echo "   <TR><td>\n   </td><td>\n";
      if ($use_javascript_addr_book) {
         echo "      <SCRIPT LANGUAGE=JavaScript><!--\n document.write(\"";
         echo "         <input type=button value=\\\""._("Addresses")."\\\" onclick='javascript:open_abook();'>\");";
         echo "         // --></SCRIPT><NOSCRIPT>\n";
         echo "         <input type=submit name=\"html_addr_search\" value=\""._("Addresses")."\">";
         echo "      </NOSCRIPT>\n";
      } else {
         echo "      <input type=submit name=\"html_addr_search\" value=\""._("Addresses")."\">";
      }
      echo "\n    <INPUT TYPE=SUBMIT NAME=send VALUE=\"". _("Send") . "\">\n";

      if ($save_as_draft) {
          echo '<input type="submit" name ="draft" value="' . _("Save Draft") . "\">\n";
      }
      if ($default_use_priority) {
        if(!isset($mailprio)) {
	  $mailprio = "3";
	}
	echo "\n\t". _("Priority") .":<select name=\"mailprio\">".
	  "\n\t\t<option value=1".($mailprio=="1"?" selected":"").">". _("High") ."</option>".
	  "\n\t\t<option value=3".($mailprio=="3"?" selected":"").">". _("Normal") ."</option>".
	  "\n\t\t<option value=5".($mailprio=="5"?" selected":"").">". _("Low")."</option>".
	  "\n\t</select>";
      }

      do_hook("compose_button_row");

      echo "   </TD>\n";
      echo "   </TR>\n\n";
   }

   function checkInput ($show) {
      /** I implemented the $show variable because the error messages
          were getting sent before the page header.  So, I check once
          using $show=false, and then when i'm ready to display the
          error message, show=true **/
      global $body, $send_to, $subject, $color;

      if ($send_to == "") {
         if ($show)
            plain_error_message(_("You have not filled in the \"To:\" field."), $color);
         return false;
      }
      return true;
   } // function checkInput()


   // True if FAILURE
   function saveAttachedFiles() {
      global $HTTP_POST_FILES, $attachment_dir, $attachments;
      
      $localfilename = GenerateRandomString(32, '', 7);
      while (file_exists($attachment_dir . $localfilename))
          $localfilename = GenerateRandomString(32, '', 7);

      if (!@rename($HTTP_POST_FILES['attachfile']['tmp_name'], $attachment_dir.$localfilename)) {
         if (!@copy($HTTP_POST_FILES['attachfile']['tmp_name'], $attachment_dir.$localfilename)) {
            return true;
         }
      }

      $newAttachment['localfilename'] = $localfilename;
      $newAttachment['remotefilename'] = $HTTP_POST_FILES['attachfile']['name'];
      $newAttachment['type'] =
         strtolower($HTTP_POST_FILES['attachfile']['type']);

      if ($newAttachment['type'] == "")
         $newAttachment['type'] = 'application/octet-stream';

      $attachments[] = $newAttachment;
    }

   if (!isset($mailbox) || $mailbox == '' || ($mailbox == 'None'))
      $mailbox = "INBOX";

   if (isset($draft)) {
      require_once ('../src/draft_actions.php');
      if (!saveMessageAsDraft($send_to, $send_to_cc, $send_to_bcc, $subject, $body, $reply_id)) {
         showInputForm();
         exit();
      } else {
         $draft_message = _("Draft Email Saved");
         /* If this is a resumed draft, then delete the original */
         if(isset($delete_draft)) {
            Header("Location: delete_message.php?mailbox=$draft_folder&message=$delete_draft&sort=$sort&startMessage=1");
            exit();
         } else {
            Header("Location: right_main.php?mailbox=$draft_folder&sort=$sort&startMessage=1&note=$draft_message");
            exit();
         }
      }
   }

   if (isset($send)) {
      if (isset($HTTP_POST_FILES['attachfile']) &&
          $HTTP_POST_FILES['attachfile']['tmp_name'] &&
          $HTTP_POST_FILES['attachfile']['tmp_name'] != 'none')
          $AttachFailure = saveAttachedFiles();
      if (checkInput(false) && !isset($AttachFailure)) {
         $urlMailbox = urlencode (trim($mailbox));
         if (! isset($reply_id))
             $reply_id = 0;
         // Set $default_charset to correspond with the user's selection
         // of language interface.
         set_my_charset();

         // This is to change all newlines to \n
         // We'll change them to \r\n later (in the sendMessage function)
         $body = str_replace("\r\n", "\n", $body);
         $body = str_replace("\r", "\n", $body);

         // Rewrap $body so that no line is bigger than $editor_size
         // This should only really kick in the sqWordWrap function
         // if the browser doesn't support "HARD" as the wrap type
         // Or, in Opera's case, something goes wrong.
         $body = explode("\n", $body);
         $newBody = '';
         foreach ($body as $line) {
            if( $line <> '-- ' )
               $line = rtrim($line);
            if (strlen($line) <= $editor_size + 1)
               $newBody .= $line . "\n";
            else {
               sqWordWrap($line, $editor_size) . "\n";
               $newBody .= $line;
            }
         }
         $body = $newBody;

         do_hook("compose_send");

         if (! isset($mailprio))
	    $Result = sendMessage($send_to, $send_to_cc, $send_to_bcc, 
	                          $subject, $body, $reply_id);
	 else
	    $Result = sendMessage($send_to, $send_to_cc, $send_to_bcc,
	                          $subject, $body, $reply_id, $mailprio);
         if (! $Result) {
            showInputForm();
            exit();
         }
         if ( isset($delete_draft)) {
            Header("Location: delete_message.php?mailbox=$draft_folder&message=$delete_draft&sort=$sort&startMessage=1");
            exit();
         }
         
         Header("Location: right_main.php?mailbox=$urlMailbox&sort=$sort&startMessage=1");
      } else {
         //$imapConnection = sqimap_login($username, $key, $imapServerAddress, $imapPort, 0);
         displayPageHeader($color, $mailbox);

         if (isset($AttachFailure))
             plain_error_message(_("Could not move/copy file. File not attached"), $color);

         checkInput(true);

         showInputForm();
         //sqimap_logout($imapConnection);
      }
   } else if (isset($html_addr_search_done)) {
      displayPageHeader($color, $mailbox);

      if (isset($send_to_search) && is_array($send_to_search)) {
         foreach ($send_to_search as $k => $v) {
       if (substr($k, 0, 1) == 'T') {
               if ($send_to)
                  $send_to .= ', ';
               $send_to .= $v;
       }
       elseif (substr($k, 0, 1) == 'C') {
          if ($send_to_cc)
             $send_to_cc .= ', ';
          $send_to_cc .= $v;
       }
       elseif (substr($k, 0, 1) == 'B') {
          if ($send_to_bcc)
             $send_to_bcc .= ', ';
          $send_to_bcc .= $v;
       }
         }
      }

      showInputForm();
   } else if (isset($html_addr_search)) {
      if (isset($HTTP_POST_FILES['attachfile']) &&
          $HTTP_POST_FILES['attachfile']['tmp_name'] &&
          $HTTP_POST_FILES['attachfile']['tmp_name'] != 'none')
      {
          if (saveAttachedFiles())
                plain_error_message(_("Could not move/copy file. File not attached"), $color);
      }
      // I am using an include so as to elminiate an extra unnecessary click.  If you
      // can think of a better way, please implement it.
      include_once('./addrbook_search_html.php');
   } else if (isset($attach)) {
      if (saveAttachedFiles())
            plain_error_message(_("Could not move/copy file. File not attached"), $color);
      displayPageHeader($color, $mailbox);
      showInputForm();
   } else if (isset($do_delete)) {
      displayPageHeader($color, $mailbox);

      if (isset($delete) && is_array($delete))
      {
         foreach($delete as $index)
         {
            unlink ($attachment_dir.$attachments[$index]['localfilename']);
            unset ($attachments[$index]);
         }
      }

      showInputForm();
   } else {
      // This handles the default case as well as the error case
      // (they had the same code) --> if (isset($smtpErrors))
      $imapConnection = sqimap_login($username, $key, $imapServerAddress,
          $imapPort, 0);
      displayPageHeader($color, $mailbox);

      $newmail = true;

      ClearAttachments();

      if (isset($forward_id) && $forward_id && isset($ent_num) && $ent_num)
          getAttachments(0);

      if (isset($draft_id) && $draft_id && isset($ent_num) && $ent_num)
          getAttachments(0);

      newMail();
      showInputForm();
      sqimap_logout($imapConnection);
   }

   function ClearAttachments() {
       global $attachments, $attachment_dir;

       foreach ($attachments as $info) {
           if (file_exists($attachment_dir . $info['localfilename'])) {
               unlink($attachment_dir . $info['localfilename']);
           }
       }

       $attachments = array();
   }

   function getReplyCitation($orig_from) {
      global $reply_citation_style, $reply_citation_start, $reply_citation_end;

      /* First, return an empty string when no citation style selected. */
      if (($reply_citation_style == '') || ($reply_citation_style == 'none')) {
         return ('');
      }

      /* Otherwise, try to select the desired citation style. */
      switch ($reply_citation_style) {
         case 'author_said':
            $start = '';
            $end   = ' ' . _("said") . ':';
            break;
         case 'quote_who':
            $start = '<' . _("quote") . ' ' . _("who") . '="';
            $end   = '">';
            break;
         case 'user-defined':
            $start = $reply_citation_start;
            $end   = $reply_citation_end;
            break;
         default: return ('');
      }

      /* Build and return the citation string. */
      return ($start . $orig_from . $end . "\n");
   }
?>