cscope is a screen-oriented software development tool that allows the user to
browse through C source files for specified code elements. It can find symbols,
global definitions, functions called by a function, functions calling a
function, arbitrary regexp patterns and much more. cscope can be used for
projects of all sizes. Vim and Emacs integration is available.

WWW: http://cscope.sourceforge.net/
https://sourceforge.net/projects/cscope/