Thread: Variable assigning Functions

I know this might sound stupid, but I want to use a function to assign my own data type..

Code:

#include <stdio.h>
#include <stdlib.h>

typedef unsigned char byte;

typedef struct {
 byte header[15];
 int a;
 int b;
 byte *data;
} MY_TYPE;

int my_function(MY_TYPE mt)
{
 

}

int main()
{
 int er;
 MY_TYPE a;

 er = my_function(a);
}

What I want is for my_function to return an integer value to indicate the functions success or failure. This I know how to do..

But I want my_function's My_TYPE mt, to be equal to the main's MY_TYPE a, after the function is called..

Here's my problem, I want to do it without making ANY of the variables GLOBAL.

Any help would be great..