Try to add some validation:

int *test = Menu_Device();
if(test != NULL) {  // Check that the pointer is pointing to something
    char buf[20];
    sprintf(buf, "%d", *test);
    GRRLIB_Printf(20, 328, tex_font, 0xFFFFFFFF, 1, buf);
}

PS: This question has nothing to do with GRRLIB, next time try another forum

Try initializing the buffer:

int *test = Menu_Device();
if(test != NULL) {  // Check that the pointer is pointing to something
    char buf[20] = "";
    sprintf(buf, "%d", *test);
    GRRLIB_Printf(20, 328, tex_font, 0xFFFFFFFF, 1, buf);
}

If that does not work, try commenting the line with GRRLIB_Printf and tell me what is happening without the line.

Could you tell me what Menu_Device() is returning, is it really an int *? Paste the declaration of the function please.

celinedules wrote:

So the sprintf causes it to freeze.

I knew it's was not a GRRLIB question

celinedules wrote:

Code:

int *Menu_Device(void);

For testing I just return 1 in the function.

Does it really need to be a pointer? If you return 1, this wrong. You should return a pointer to the value 1.

If you want more help, please provide the code from Menu_Device or I wont be able to help further.

Why not just use:

int Menu_Device(void) {

    u32 timeout = 30;
    s32 ret;
    
    ret = WBFS_Init(1, timeout);    
    
    return 1;
}

Without using a pointer.