add my unfinished cbase

cbase/data/lists/Makefile

@@ -0,0 +1,26 @@
+OBJ=linkedlist.o
+SRC=$(OBJ:.o=.c)
+HDR=$(SRC:.c=.h)
+TST=$(SRC:.c=.test.c)
+TSTBIN=$(TST:.test.c=.test)
+
+CFLAGS+=-Wall
+CFLAGS+=-Wextra
+
+all: $(OBJ)
+
+.PHONY: all
+
+test: $(TSTBIN)
+
+.PHONY: test
+
+clean:
+	$(RM) $(OBJ) $(TSTBIN)
+
+%.o: %.c %.h
+	$(CC) -o $@ -c $< $(CFLAGS)
+
+$(TSTBIN): $(TST) $(OBJ)
+	$(CC) -o $@ $(@:=.c) $(@:.test=.c) $(CFLAGS)
+	./$@

cbase/data/lists/linkedlist.c

@@ -0,0 +1,116 @@
+#include <stdlib.h>
+
+#include "linkedlist.h"
+
+LinkedList*
+new_linkedlist() {
+	// TODO: handle malloc failure
+	LinkedListNode* nil = malloc(sizeof(LinkedListNode));
+	nil->next = nil;
+	nil->prev = nil;
+
+	LinkedList* l = malloc(sizeof(LinkedList));
+	l->nil = nil;
+
+	return l;
+}
+
+LinkedListNode*
+first(LinkedList* l) {
+	return l->nil->next;
+}
+
+LinkedListNode*
+last(LinkedList* l) {
+	return l->nil->prev;
+}
+
+void
+append(LinkedList* l, void* x) {
+	LinkedListNode* nil = l->nil;
+
+	// TODO: handle malloc failure
+	LinkedListNode* y = malloc(sizeof(LinkedListNode));
+	y->next = nil;
+	y->prev = nil->prev->prev;
+	y->data = x;
+
+	nil->prev->prev->next = y;
+	nil->prev = y;
+}
+
+void
+insert(LinkedList* l, void* x) {
+	LinkedListNode* nil = l->nil;
+
+	// TODO: handle malloc failure
+	LinkedListNode* y = malloc(sizeof(LinkedListNode));
+	y->prev = nil;
+	y->next = nil->next;
+	y->data = x;
+
+	nil->next->prev = x;
+	nil->next = x;
+}
+
+void
+insert_at(LinkedList* l, int at, void* x) {
+	LinkedListNode* nil = l->nil;
+	LinkedListNode* y = nil;
+
+	for (int i = 0; i < at; i++) {
+		y = y->next;
+		if (y == nil) {
+			// Index out of range
+		}
+	}
+
+	// TODO: handle malloc failure
+	LinkedListNode* new = malloc(sizeof(LinkedListNode));
+	new->prev = y;
+	new->next = y->next;
+	new->data = x;
+
+	y->next->prev = new;
+	y->next = new;
+}
+
+LinkedListNode*
+search(LinkedList* l, void* x) {
+	LinkedListNode* y = l->nil->next;
+
+	while (y != l->nil) {
+		if (y->data == x)
+			return y;
+		y = y->next;
+	}
+
+	return NULL;
+}
+
+void
+delete_item(LinkedListNode* x) {
+	x->prev->next = x->next;
+	x->next->prev = x->prev;
+
+	free(x);
+}
+
+void
+delete_linkedlist(LinkedList* l) {
+	free(l->nil);
+	free(l);
+}
+
+int
+count_linkedlist(LinkedList* l) {
+	int n = 0;
+	LinkedListNode* x = l->nil;
+
+	while (x->next != l->nil) {
+		x = x->next;
+		n++;
+	}
+
+	return n;
+}

cbase/data/lists/linkedlist.h

@@ -0,0 +1,44 @@
+#ifndef LINKEDLIST_H
+#define LINKEDLIST_H
+
+typedef struct LinkedListNode {
+	void* data;
+	struct LinkedListNode* prev;
+	struct LinkedListNode* next;
+} LinkedListNode;
+
+typedef struct LinkedList {
+	LinkedListNode* nil;
+} LinkedList;
+
+LinkedList*
+new_linkedlist();
+
+LinkedListNode*
+first(LinkedList* l);
+
+LinkedListNode*
+last(LinkedList* l);
+
+void
+append(LinkedList* l, void* x);
+
+void
+insert(LinkedList* l, void* x);
+
+void
+insert_at(LinkedList* l, int i, void* x);
+
+LinkedListNode*
+search(LinkedList* l, void* x);
+
+void
+delete_item(LinkedListNode* x);
+
+void
+delete_linkedlist(LinkedList* l);
+
+int
+count_linkedlist(LinkedList* l);
+
+#endif

cbase/data/lists/linkedlist.test.c

@@ -0,0 +1,35 @@
+#include<stdio.h>
+#include<assert.h>
+
+#include "linkedlist.h"
+
+void
+test_empty() {
+	LinkedList* l = new_linkedlist();
+	assert(count_linkedlist(l) == 0);
+	delete_linkedlist(l);
+}
+
+void
+test_single() {
+	LinkedList* l = new_linkedlist();
+
+	int x = 42;
+	int* p = &x;
+
+	append(l, p);
+	assert(count_linkedlist(l) == 1);
+	assert(first(l)->data == p);
+	assert(last(l)->data == p);
+
+	delete_item(first(l));
+	assert(count_linkedlist(l) == 0);
+
+	delete_linkedlist(l);
+}
+
+int
+main() {
+	test_empty();
+	test_single();
+}