list.c

   1 /*-
   2  * "THE BEER-WARE LICENSE" (Revision 42):
   3  * <tobias.rehbein@web.de> wrote this file. As long as you retain this notice
   4  * you can do whatever you want with this stuff. If we meet some day, and you
   5  * think this stuff is worth it, you can buy me a beer in return.
   6  *                                                              Tobias Rehbein
   7  */
   8
   9 #include <assert.h>
  10 #include <stdlib.h>
  11
  12 #include "list.h"
  13
  14 struct element *
  15 create_element(void *payload)
  16 {
  17         assert(payload != NULL);
  18
  19         struct element *new = malloc(sizeof(*new));
  20         if (new != NULL) {
  21                 new->payload = payload;
  22                 new->next = NULL;
  23         }
  24
  25         return (new);
  26 }
  27
  28 struct element *
  29 destroy_element(struct element *element)
  30 {
  31         assert(element !=NULL);
  32
  33         struct element *next = element->next;
  34         free(element);
  35
  36         return (next);
  37
  38 }
  39
  40 struct element *
  41 prepend_element(struct element *new, struct element *list)
  42 {
  43         assert(new != NULL);
  44
  45         new->next = list;
  46
  47         return (new);
  48 }