cscope vim integration

vimrc

" cscope options
if has("cscope")
  set csprg=/usr/local/bin/cscope
  set csto=0
  set cst
  set nocsverb
  " add any database in current directory
  if filereadable("cscope.out")
    cs add cscope.out
  " else add database pointed to by environment
  elseif $CSCOPE_DB != ""
    cs add $CSCOPE_DB
  endif
  set csverb

  map g<C-]> :cs find 3 <C-R>=expand("<cword>")<CR><CR>
  map g<C-\> :cs find 0 <C-R>=expand("<cword>")<CR><CR>
endif