2 files changed, 172 insertions, 0 deletions
diff --git a/src/ll.c b/src/ll.c
new file mode 100644
index 0000000..7059ec5
--- /dev/null
+++ b/src/ll.c
@@ -0,0 +1,118 @@
+// Implementation of a Linked List
+#include <stdio.h>
+#include <stdlib.h>
+#include "ll.h"
+
+Node* llnode(int value) {
+  Node* n = (Node*) malloc(sizeof(Node));
+  n->value = value;
+  n->next = NULL;
+  return n;
+}
+
+void llprint(Node* head) {
+  Node* node = head;
+  printf("[ ");
+  do {
+    printf("%i ", node->value);
+    node = node->next;
+  } while (node != NULL);
+  printf("]\n");
+  free(node);
+}
+
+void llvprint(Node* head) {
+  Node* node = head;
+  do {
+    printf("[*] %i\n", node->value);
+    node = node->next;
+    printf(" |\n");
+  } while (node != NULL);
+  printf("[/] %s\n", (char*) node);
+}
+
+int lllength(Node* head) {
+  Node* node = head;
+  int count = 0;
+  while (node != NULL) {
+    ++count;
+    node = node->next;
+  }
+  return count;
+}
+
+void llpush(Node** head, int value) {
+  Node* n = llnode(value);
+  n->next = *head;
+  *head = n;
+}
+
+int llpop(Node** head) {
+  int val = (*head)->value;
+  *head = (*head)->next;
+  return val;
+}
+
+void llappend(Node* head, int value) {
+  Node* n = head;
+  while (n->next != NULL) n = n->next;
+  n->next = llnode(value);
+}
+
+void llinsert(Node** head, int value, int index) {
+  Node* n = *head;
+  Node* cur = NULL;
+  Node* node = llnode(value);
+  int i = 0;
+  while (n->next != NULL && i < index) {
+    cur = n;
+    n = n->next;
+    ++i;
+  }
+  cur->next = node;
+  node->next = n;
+}
+
+void llfree(Node* head) {
+  Node* n = NULL;
+  while (head != NULL) {
+    n = head;
+    head = head->next;
+    free(n);
+  }
+}
+
+int llrmlast(Node** head) {
+  Node* n = *head;
+  Node* cur = NULL;
+  while (n->next != NULL) {
+    cur = n;
+    n = n->next;
+  }
+  int val = n->value;
+  cur->next = NULL;
+  free(n);
+  return val;
+}
+
+int llrm(Node** head, int index) {
+  Node* n = *head;
+  Node* cur = NULL;
+  if (index == -1) {
+    while (n->next != NULL) {
+      cur = n;
+      n = n->next;
+    }
+  } else {
+    int i = 0;
+    while (n->next != NULL && i < index) {
+      cur = n;
+      n = n->next;
+      ++i;
+    }
+  }
+  cur->next = n->next;
+  int val = n->value;
+  free(n);
+  return val;
+}
diff --git a/src/ll.h b/src/ll.h
new file mode 100644
index 0000000..f777ace
--- /dev/null
+++ b/src/ll.h
@@ -0,0 +1,54 @@
+#ifndef LL
+#define LL
+
+#define NEW_NODE llnode();
+
+#include <stdio.h>
+#include <stdlib.h>
+
+// Node
+typedef struct Node {
+  int value;
+  struct Node* next;
+} Node;
+
+// Create & initialise a new node
+Node* llnode(int value);
+
+// Print linked list values
+void llprint(Node* head);
+void llvprint(Node* head);
+
+// Return number of nodes in list
+// O(n)
+int lllength(Node* head);
+
+// Prepend a value to the list
+// O(1)
+void llpush(Node** head, int value);
+
+// Pop (remove) first node
+// O(1)
+int llpop(Node** head);
+
+// Append value to the end of the list
+// O(n)
+void llappend(Node* head, int value);
+
+// Insert a value to the list at index
+// O(n)
+void llinsert(Node** head, int value, int index);
+
+// Free nodes from memory
+// O(n)
+void llfree(Node* head);
+
+// Remove last node
+// O(n)
+int llrmlast(Node** head);
+
+// Remove node at index
+// O(n)
+int llrm(Node** head, int index);
+
+#endif //LL