new file: src/llist.c

new file:   src/llist.h

src/llist.c

@@ -0,0 +1,63 @@
+#include "llist.h"
+#include <stdlib.h>
+
+/* create new linked list
+ * use llistFree after use
+ * retturns NULL on failure
+ */
+llist *llistNew(void *data, int (*cmpFN)(void *a, void *b)) {
+  llist *r = (llist *)malloc(sizeof(llist));
+  if (r != NULL) {
+    r->cmpFn = cmpFN;
+    r->data = data;
+    r->prev = NULL;
+    r->next = NULL;
+  }
+  return r;
+}
+
+/*return  last node of linked list;
+ */
+llist *llistTail(llist *l) {
+  llist *tail = l;
+  while (tail->next != NULL) {
+    tail = tail->next;
+  }
+  return tail;
+}
+
+/* creates new node from data and appends it to head
+ *
+ */
+llist *llistAppend(llist *head, void *data) {
+  llist *new = llistNew(data, head->cmpFn);
+  if (new != NULL) {
+    llist *tail = llistTail(head);
+    new->data = data;
+    new->next = NULL;
+    new->prev = tail;
+    tail->next = new;
+  }
+  return new;
+}
+
+void *llistGet(llist *head, void *key) {
+  llist *c = head;
+  while (c != NULL) {
+    if (key == c) {
+      return c;
+    }
+    c = c->next;
+  }
+  return NULL;
+}
+bool llistContains(llist *head, void *key) {
+  return llistGet(head, key) != NULL;
+}
+void llistFree(llist *head) {
+  while (head != NULL) {
+    llist *tmp = head->next;
+    free(head);
+    head = tmp;
+  }
+}

src/llist.h

@@ -0,0 +1,23 @@
+#ifndef LLIST
+#define LLIST
+#include <stdbool.h>
+
+typedef struct llist {
+  void *data;
+  struct llist *next;
+  struct llist *prev;
+  int (*cmpFn)(void *a, void *b); // function that compares data
+} llist;
+
+// create new linked list with content(void* data) and cmpFN
+llist *llistNew(void *data, int (*cmpFN)(void *a, void *b));
+// create new node with data and append to tail of head
+llist *llistAppend(llist *head, void *data);
+// return llistNode that contains key or NULL
+void *llistGet(llist *head, void *key);
+// TURE if llist contains key
+bool llistContains(llist *head, void *key);
+// free llist node (Does Not free data it contains!!)
+void llistFree(llist *head);
+
+#endif