Refering to structure in structure, in a function

In ANSI C, I'm trying to add an item to the end of a linked-list, using the following structures:

typedef struct items{
    char itemname[30];
    int damage;
    int defense;

typedef struct itemlist{
    struct items item;
    struct itemlist *next;
} itemlist;

In short, itemlist is a "cell" struct in the list, and items is what contains the data. I try to refer to them as this:

itemlist* additem(itemlist *itemslist, items data){
   itemlist *moving, *new;

   new = (itemlist*) malloc(sizeof(itemlist));

   /* These 3 lines are not working*/
   new->item->damage = data->damage;
   new->item->defense = data->defense;

   new->next = NULL;

   if (itemslist == NULL)     /* empty list? */
      return new;

   for (moving = itemslist; moving->next != NULL; moving = moving->next); 

   moving->next = new;

   return itemlist;

My question is, how do I refer to these structure in structure types? The error messages read as:

error: invalid type argument of '->' (have 'struct items')

error: invalid type argument of '->' (have 'items')

Thank you for your time


The item in itemlist is not a pointer to an item but the actual item so you don't use -> you use . as in.


Same with the function argument data.

As an aside, it's generally a bad idea to use C++ keywords like new in C code. If you ever want to compile this with a C++ compiler it's going to be a pain. Or worse, if you wind up with C++ keywords in your headers then you can't even expose the header to a C++ application.

The item data is passed by value to the function so you need to use the . operator instead of -> here.

Tags: C / Function / Pointers

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