在 syntax/c.vim文件中加入以下内容
"highlight Functions
syn match cFunctions display "\<[a-zA-Z_][a-zA-Z_0-9]*\>[^()]*)("me=e-2
syn match cFunctions display "\<[a-zA-Z_][a-zA-Z_0-9]*\>\s*("me=e-1
hi cFunctions ctermfg=3 guifg=goldenrod
"hi cFunctions gui=NONE cterm=bold ctermfg=blue
"syn match cFunctions display "[a-zA-Z_]\{-1,}\s\{-0,}(\{1}"ms=s,me=e-1
"hi def link cFunctions Title
"========================================================
" Highlight All Math Operator
"========================================================
" C math operators
syn match cMathOperator display "[-+*%=<>(){};|.\[\],&!^~:]"
"" C pointer operators
syn match cPointerOperator display "->/|/."
"" C logical operators - boolean results
syn match cLogicalOperator display "[!<>]=/="
syn match cLogicalOperator display "==/|/<=/|/>=/|/!="
"" C bit operators
"syn match cBinaryOperator display"/(&/||/|/^/|<</|>>/)=/="
""syn match cBinaryOperator display "/~"
""syn match cBinaryOperatorError display "/~="
"" More C logical operators - highlight in preference to binary
"syn match cLogicalOperator display "&&/|||"
"syn match cLogicalOperatorError display "/(&&/|||/)="
" Math Operator
hi cMathOperator guifg=#3EFFE2
hi cPointerOperator guifg=#3EFFE2
hi cLogicalOperator guifg=#3EFFE2
"hi cBinaryOperator guifg=#3EFFE2
"hi cBinaryOperatorError guifg=#3EFFE2
"hi cLogicalOperator guifg=#3EFFE2
"hi cLogicalOperatorError guifg=#3EFFE2