dll_get*

Synopsis:

size_t dll_getsize(const dll_t *restrict dll);
dll_obj_t *dll_gethead(const dll_t *restrict dll);
dll_obj_t *dll_getlast(const dll_t *restrict dll);

void *dll_getdata(const dll_obj_t *restrict dll_obj);
size_t dll_getdatasize(const dll_obj_t *restrict dll_obj);
dll_obj_t *dll_getprev(const dll_obj_t *restrict dll_obj);
dll_obj_t *dll_getnext(const dll_obj_t *restrict dll_obj);

size_t	dll_getid(const dll_t *restrict dll, const dll_obj_t *restrict dll_obj);

Description:

• dll_getsize: Get a current count of objects in list
• dll_gethead: Get a current first object in list
• dll_getlast: Get a current last object in list
• dll_getdata: Get a pointer to data in object
• dll_getdatasize: Get a size of data in object
• dll_getprev: Get a previous object
• dll_getnext: Get a next object
• dll_getid: Get a index of object in list

Return value:

Some value otherwise 0 if:

• dll_getdatasize, dll_getsize:
  • pointer to object\list is NULL
• dll_getid:
  • pointer to object\list is NULL
  • dll_obj object is not pointing to any object in list
  • if DLL_BIT_EIGN is not specified:
    • list dll hasn't any objects

Pointer otherwise NULL if:

• dll_getnext, dll_getprev, dll_getdata, dll_getlast, dll_gethead:
  • pointer to object\list is NULL
  • list is empty
  • data inside object is pointed to NULL