Use findfile() and added documenation

autoload/cscope_auto.vim

@@ -1,25 +1,19 @@
 " Maintainer: Kaiting Chen <ktchen14@gmail.com>
 
-let s:dirsep = fnamemodify(getcwd(), ':p')[-1:]
-
 " Return the nearest cscope database to the path by walking up the directory
 " tree and looking for a file named according to cscope_auto_database_name. If
 " there is no matching cscope database then return an empty string.
 "
 " Consider just using findfile() if we can find a way to easily work around
 " &suffixesadd.
 function! cscope_auto#locate_database(path)
-  let path = fnamemodify(a:path, ':p:h')
-  let database_name = get(g:, 'cscope_auto_database_name', 'cscope.out')
-
-  while !exists('last') || path !=# last
-    let file = substitute(path, s:dirsep . '\?$', s:dirsep . database_name, '')
-    if filereadable(file)
-      return file
-    endif
-    let last = path
-    let path = fnamemodify(path, ':h')
-  endwhile
+  let suffixesadd = &suffixesadd
+  let &suffixesadd = ''
+  let file = fnamemodify(findfile(get(b:, 'cscope_auto_database_name', get(g:, 'cscope_auto_database_name', 'cscope.out')), './;'), ':p')
+  let &suffixesadd = suffixesadd
+  if filereadable(file)
+    return file
+  endif
   return ''
 endfunction
 

doc/cscope_auto.txt

@@ -0,0 +1,43 @@
+*cscope_auto.txt*  Automatically connect to cscope
+
+Author:  Kaiting Chen				*cscope-auto-author*
+License: See |cscope-auto-license|
+
+This plugin is only available if Vim is compiled with |+cscope| support.
+==============================================================================
+						*cscope-auto*
+
+cscope-auto ensures that a single |cscope| connection is available to the best
+cscope database for the current buffer. 
+
+						*g:cscope_auto_database_name*
+>
+  let g:cscope_auto_database_name = 'cscope.out'
+<
+Change the cscope database name via |g:cscope_auto_database_name| variable.
+Defaults to 'cscope.out'. Use b:cscope_auto_database_name for buffer local
+database name.
+
+
+==============================================================================
+LICENSE                                  	*cscope-license*
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+ vim:tw=78:ts=8:ft=help:norl:

plugin/cscope_auto.vim

@@ -1,6 +1,6 @@
 " Maintainer: Kaiting Chen <ktchen14@gmail.com>
 
-if exists('g:loaded_cscope_auto')
+if exists('g:loaded_cscope_auto') || !has('cscope')
   finish
 endif
 let g:loaded_cscope_auto = 1