放在 /usr/share/vim/vim80/syntax/c.vim 最后:

syn match cFunctions "\<[a-zA-Z_][a-zA-Z_0-9]*\>[^()]*)("me=e-2syn match cFunctions "\<[a-zA-Z_][a-zA-Z_0-9]*\>\s*("me=e-1hi cFunctions ctermfg=3 gui=boldsyn keyword cXhc         std iosyn keyword cType       LL Iter uinthi cXhc gui=bold