6 files changed, 106 insertions, 0 deletions
diff --git a/comp/cw/code/tokenizer/ads/dll/Makefile b/comp/cw/code/tokenizer/ads/dll/Makefile
new file mode 100644
index 0000000..651681d
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/Makefile
@@ -0,0 +1,5 @@
+all: dll.c
+	cc dll.c -c -o dll.o
+
+test: all
+	cc dll.o dlltest.c -o dlltest
diff --git a/comp/cw/code/tokenizer/ads/dll/dll.c b/comp/cw/code/tokenizer/ads/dll/dll.c
new file mode 100644
index 0000000..b24b13f
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/dll.c
@@ -0,0 +1,62 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+typedef struct dll_t dll_t;
+
+typedef struct dll_t {
+	void *data;
+	dll_t *next;
+	dll_t *prev;
+} dll_t;
+
+dll_t *dllalloc(){
+	dll_t *output = malloc(sizeof(dll_t));
+	if (output == NULL)
+		return NULL;
+	output->next = NULL;
+	output->prev = NULL;
+	return output;
+}
+
+void dllsetdata(dll_t *node, void *data){
+	node->data = malloc(sizeof(data));
+	memcpy(node->data, data, sizeof(data));
+}
+
+void dllsetnext(dll_t *node, dll_t *next){
+	if (node->next == NULL) {
+		node->next = next;
+		node->next->prev = node;
+	}
+	else
+		dllsetnext(node->next, next);
+}
+void dllsetprev(dll_t *node, dll_t *prev){
+	if (node->prev == NULL) {
+		node->prev = prev;
+		node->prev->next = node;
+	}
+	else
+		dllsetprev(node->prev, prev);
+}
+
+void *dllgetat(dll_t *head, int index){
+	if (index == 0)
+		return head->data;
+	else {
+		if (head->next != NULL)  {
+			return dllgetat(head->next, index - 1);
+		}else {
+			return NULL;
+		}
+	}
+}
+
+void dllfreeall(dll_t *head){
+	if (head->next != NULL)
+		dllfreeall(head->next);
+	free(head->data);
+	free(head);
+}
+
diff --git a/comp/cw/code/tokenizer/ads/dll/dll.h b/comp/cw/code/tokenizer/ads/dll/dll.h
new file mode 100644
index 0000000..44940ce
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/dll.h
@@ -0,0 +1,19 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+typedef struct dll_t dll_t;
+
+typedef struct dll_t {
+	void *data;
+	dll_t *next;
+	dll_t *prev;
+} dll_t;
+
+dll_t *dllalloc();
+void dllsetdata(dll_t *node, void *data);
+void dllsetnext(dll_t *node, dll_t *next);
+void dllsetprev(dll_t *node, dll_t *prev);
+void *dllgetat(dll_t *head, int index);
+void dllfreeall(dll_t *head);
+
diff --git a/comp/cw/code/tokenizer/ads/dll/dll.o b/comp/cw/code/tokenizer/ads/dll/dll.o
new file mode 100644
index 0000000..2c9a145
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/dll.o
diff --git a/comp/cw/code/tokenizer/ads/dll/dlltest b/comp/cw/code/tokenizer/ads/dll/dlltest
new file mode 100755
index 0000000..83f900c
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/dlltest
diff --git a/comp/cw/code/tokenizer/ads/dll/dlltest.c b/comp/cw/code/tokenizer/ads/dll/dlltest.c
new file mode 100644
index 0000000..4544d2e
--- /dev/null
+++ b/comp/cw/code/tokenizer/ads/dll/dlltest.c
@@ -0,0 +1,20 @@
+#include <stdio.h>
+
+#include "dll.h"
+
+int main(){
+	dll_t *head = dllalloc();
+	dllsetdata(head, "hello");
+
+	for (int i = 0; i < 3; i++){
+		dll_t *node = dllalloc();
+		dllsetdata(node, "hi");
+		dllsetnext(head, node);
+	}
+
+	for (int i = 0; i < 4; i++)
+		printf("%s\n", (char *)dllgetat(head, i)); 
+	printf("%s\n", (char *)head->prev->next->data);
+
+	dllfreeall(head);
+}