pass struct by reference

gistfile1.c

#include <stdio.h>

struct randal {
   int x;
   int y;
   char z;
};

void func1(int test, struct randal *p)
{
   int buf[100];
   buf[0] = test;
   buf[1] = 1;
   buf[2] = 123;
   buf[3] = 5321;
   buf[4] = 777;
   // magic with struct
   // remember that in the end, it’s all just memory
   // re-read!
   *p = *((struct randal *)buf); 
   
   fprintf(stderr, "in func %d\n", p->x); 
}

void func2(int *om)
{
   int x = 10;
   *om = x;
}

int main()
{
   struct randal am;
   func1(123, &am);  
   fprintf(stderr, "%d\n", am.x);
   fprintf(stderr, "=======\n");
   int om;
   func2(&om);
   fprintf(stderr, "func2 %d\n", om);

   return 0;
}