This is for your .vimrc.
Picked from some google search results.
" highlight too long lines
autocmd BufWinEnter *.c let w:m2=matchadd('ErrorMsg', '\%>80v.\+', -1)
autocmd BufWinLeave *.c call matchdelete(w:m2)
" permanently highlight 80th column
" set colorcolumn=80
" highlight trailing whitespace and tabs after spaces in leading whitespace
highlight ExtraWhitespace ctermbg=red guibg=red
autocmd BufWinEnter *.c match ExtraWhitespace /^\s* \|\s\+$/
autocmd InsertEnter *.c match ExtraWhitespace /^\s* \|\s\+\%#\@<!$/
autocmd InsertLeave *.c match ExtraWhitespace /^\s* \|\s\+$/
autocmd BufWinLeave *.c call clearmatches()
--
Andriy Gapon
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