textscan and Regexp form .c file

If I do have a .C file, I need to find control function name and data type. how will use MATLAB command? example: .c file

#include "headerfile.h"

double PI_A (double a, double b)

{

double c;

c=a+b;

return c;

}

I want function name and data type as a output. PI_A is function name, double is datatype.