.

bac2/os/chap2/ex5.c

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <stdio.h>
+
+struct node{
+	struct node* prev;
+	void* data;
+};
+
+typedef struct node* LIFO; 
+
+LIFO* mklifo ();
+void push(LIFO* lst , void*);
+void* pop(LIFO* lst);
+
+int main(void)
+{
+	char* t = "test";
+	LIFO* lifo = mklifo();
+	push(lifo, t);
+	printf("%s", (char *)pop(lifo));
+	
+}
+
+LIFO *mklifo (){
+	LIFO* ret = malloc(sizeof(struct node));
+	return ret;
+}
+
+void push(LIFO *lst , void *el){
+	LIFO* next = mklifo();
+	(*lst)->data = el;
+	(*next)->prev = *lst;
+	lst = next;
+}
+
+void *pop(LIFO *lst){
+	void* el;
+	(*lst)->data = el;
+	*lst = (*lst)->prev;
+	return el;
+}