#20051 [Opn->Fbk]: stream_register_wrapper and stream_eof

[wez]

 ID:               20051
 Updated by:       [EMAIL PROTECTED]
 Reported By:      [EMAIL PROTECTED]
-Status:           Open
+Status:           Feedback
 Bug Type:         Reproducible crash
 Operating System: Linux
 PHP Version:      4.3.0-pre1
 New Comment:

Please try using this CVS snapshot:

  http://snaps.php.net/php4-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php4-win32-latest.zip

Most probably fixed in the php4-latest snapshot.
Please try it and let us know how you get on.
(Very similar code to that example is used as part of the test suite).


Previous Comments:
------------------------------------------------------------------------

[2002-10-23 15:30:13] [EMAIL PROTECTED]

After fixing the missing semicolon in stream_register_wrapper's example
(in the docs and pasted below), I get infinite loops (and sometimes
crashes).  It seems like this is coming from feof() having problems
gettting TRUE from stream_eof.


<? class VariableStream {
    var $position;
    var $varname;
   
    function stream_open($path, $mode, $options, &$opened_path)
    {
        $url = parse_url($path);
        $this->varname = $url["host"];
        $this->position = 0;
        
        return true;
    }

    function stream_read($count)
    {
        $ret = substr($GLOBALS[$this->varname], $this->position,
$count);
        $this->position += strlen($ret);
        return $ret;
    }

    function stream_write($data)
    {
        $left = substr($GLOBALS[$this->varname], 0, $this->position);
        $right = substr($GLOBALS[$this->varname], $this->position +
strlen($data));
        $GLOBALS[$this->varname] = $left . $data . $right;
        $this->position += strlen($data);
        return strlen($data);
    }

    function stream_tell()
    {
        return $this->position;
    }

    function stream_eof()
    {
        return $this->position >= strlen($GLOBALS[$this->varname]);
    }

    function stream_seek($offset, $whence)
    {
        switch($whence) {
            case SEEK_SET:
                if ($offset < strlen($GLOBALS[$this->varname]) &&
$offset >= 0) {
                     $this->position = $offset;
                     return true;
                } else {
                     return false;
                }
                break;
                
            case SEEK_CUR:
                if ($offset >= 0) {
                     $this->position += $offset;
                     return true;
                } else {
                     return false;
                }
                break;
                
            case SEEK_END:
                if (strlen($GLOBALS[$this->varname]) + $offset >= 0) {
                     $this->position = strlen($GLOBALS[$this->varname])
+ $offset;
                     return true;
                } else {
                     return false;
                }
                break;
                
            default:
                return false;
        }
    }
}

stream_register_wrapper("var", "VariableStream")
    or die("Failed to register protocol");

$myvar = "";
    
$fp = fopen("var://myvar", "r+");

fwrite($fp, "line1\n");
fwrite($fp, "line2\n");
fwrite($fp, "line3\n");

rewind($fp);
while(!feof($fp)) {
    echo fgets($fp);
}
fclose($fp);
var_dump($myvar);
?>

------------------------------------------------------------------------


-- 
Edit this bug report at http://bugs.php.net/?id=20051&edit=1