Parameter passing multiple values using void pointer - c

Question

I want to pass multiple arguments to a function using a void pointer.
void* function(void *params)
{
//casting pointers
//doing something
}
int main()
{
int a = 0
int b = 10;
char x = 'S';
void function(???);
return 0;
}
I know that I have to cast them to a certain variable in my function but I do not know how I can pass my 3 arguments as one void pointer to my function.
I have searched for this problem know quite some time but I could not find anything that would help me.

Answer 1

You could do it like this:
struct my_struct
{
int a;
int b;
char x;
}
void * function(void * pv)
{
struct my_strcut * ps = pv; /* Implicitly converting the void-pointer
/* passed in to a pointer to a struct. */
/* Use ps->a, ps->b and ps->x here. */
return ...; /* NULL or any pointer value valid outside this function */
}
Use it like this
int main(void)
{
struct my_struct s = {42, -1, 'A'};
void * pv = function(&s);
}
Following up on the OP's update:
struct my_struct_foo
{
void * pv1;
void * pv2;
}
struct my_struct_bar
{
int a;
int b;
}
void * function(void * pv)
{
struct my_strcut_foo * ps_foo = pv;
struct my_struct_bar * ps_bar = ps_foo->pv1;
/* Use ps_foo->..., ps_bar->... here. */
return ...; /* NULL or any pointer value valid outside this function */
}
Use it like this
int main(void)
{
struct my_struct_bar s_bar = {42, -1};
struct my_struct_foo s_foo = {&s_bar, NULL};
void * pv = function(&s_foo);
}

Answer 2

The void* is used as a pointer to a "generic" type. Hence, you need to create a wrapping type, cast convert to void* to invoke the function, and cast convert back to your type in the function's body.
#include <stdio.h>
struct args { int a, b; char X; };
void function(void *params)
{
struct args *arg = params;
printf("%d\n", arg->b);
}
int main()
{
struct args prm;
prm.a = 0;
prm.b = 10;
prm.X = 'S';
function(&prm);
return 0;
}