functions and structures

I have a structure in a function declared like this:

struct audio ad;

and basically I need to return its address to the calling function.

First, should the declaration look something like this:

static struct audio ad;

because this is a local variable so, it will be erased from memory when control goes back to the calling function?

Seconds, how exactly should my function prototype look like?

Static version

Code:

---

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

struct audio
{
        int v1;
        char szline[14];
};

struct audio foo(void); // protoype

int main(int argc, char **argv)
{
        struct audio p;

        p = foo();

        printf("v1: %d\n", p.v1);
        printf("szline: %s\n", p.szline);
}

struct audio foo(void)
{
        static struct audio ad;

        strcpy(ad.szline, "static string");
        ad.v1 = 56;
        return ad;
}

---

Dynamic version:

Code:

---

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

struct audio
{
        int v1;
        char szline[14];
};

struct audio* foo(void); // protoype

int main(int argc, char **argv)
{
        struct audio *p;

        p = foo();

        printf("v1: %d\n", p->v1);
        printf("szline: %s\n", p->szline);

        free(p);
}

struct audio* foo(void)
{
        static struct audio *ad;

        ad = malloc(sizeof(struct audio));

        strcpy(ad->szline, "static string");
        ad->v1 = 56;
        return ad;
}

---

Thank you