/**
* Base method for File_Passwd::staticAuth()
*
* Returns a PEAR_Error if:
* o file doesn't exist
* o file couldn't be opened in read mode
* o file couldn't be locked exclusively
* o file couldn't be unlocked (only if auth fails)
* o file couldn't be closed (only if auth fails)
*
* @throws PEAR_Error
* @access protected
* @return mixed line of passwd file containing <var>$id</var>,
* false if <var>$id</var> wasn't found or PEAR_Error
* @param string $file path to passwd file
* @param string $id user_id to search for
* @param string $sep field separator
*/
function _auth($file, $id, $sep = ':')
{
$file = realpath($file);
if (!is_file($file)) {
return PEAR::raiseError("File '{$file}' couldn't be found.", 0);
}
$fh =& File_Passwd_Common::_open('r', $file);
if (PEAR::isError($fh)) {
return $fh;
}
$cmp = $id . $sep;
$len = strlen($cmp);
while ($line = fgets($fh)) {
if (!strncmp($line, $cmp, $len)) {
File_Passwd_Common::_close($fh);
return trim($line);
}
}
$e = File_Passwd_Common::_close($fh);
if (PEAR::isError($e)) {
return $e;
}
return false;
}
