extended search fix

This patch fixes a bug in the search code and did some
optimizations. Furtheron queries with only excluded
words will be rejected because they won't produce
usable output and waste only time.

darcs-hash:20050604212026-7ef76-7a096791875407859eae390290165e4b6e7ef082.gz

inc/search.php

@@ -317,6 +317,9 @@ function search_fulltext(&$data,$base,$file,$type,$lvl,$opts){
         break;
     }
   }
+
+  // a search without any posword is useless
+  if (!count($poswords)) return true;
   
   $req  = count($poswords) ? $reg .= '^(?=.*?'.join(')(?=.*?',$poswords).')' : '^';
   $reg .= count($negwords) ? '((?!'.join('|',$negwords).').)*$' : '.*$';