80 struct list {  struct
81   struct list *next;  argument
96 list_head(list_t list) {  in list_head()  argument
97   return *list;  in list_head()
101 list_remove(list_t list, void *item) {  in list_remove()  argument
102   LL_DELETE(*(struct list **)list, (struct list *)item);  in list_remove()
106 list_add(list_t list, void *item) {  in list_add()  argument
107   list_remove(list, item);  in list_add()
108   LL_APPEND(*(struct list **)list, (struct list *)item);  in list_add()
112 list_push(list_t list, void *item) {  in list_push()  argument
113   LL_PREPEND(*(struct list **)list, (struct list *)item);  in list_push()
117 list_pop(list_t list) {  in list_pop()  argument
118   struct list *l;  in list_pop()
119   l = *list;  in list_pop()
121     list_remove(list, l);  in list_pop()
127 list_insert(list_t list, void *previtem, void *newitem) {  in list_insert()  argument
129     list_push(list, newitem);  in list_insert()
131     ((struct list *)newitem)->next = ((struct list *)previtem)->next;  in list_insert()
132     ((struct list *)previtem)->next = newitem;  in list_insert()
139   return item == NULL? NULL: ((struct list *)item)->next;  in list_item_next()