I'm gonna update this, I swear...
xighlight -- Program for highlighting C source code in terminal.
Compiling:
$ sh compile.sh
Installing:
$ sudo sh install.sh
Using:
$ cat my_c_program.ext | xighlight
$ xighlight < my_c_program.ext
$ xighlight -i my_c_program.ext
This is what it prints to standard output, when standard input is C source code: