From f0aa621e6913486a55b9f7be15f12b2325937d75 Mon Sep 17 00:00:00 2001
From: Murilo Soares Pereira <murilo.soares3@gmail.com>
Date: Sat, 3 Apr 2010 22:12:42 -0300
Subject: [PATCH] Added pop() and function prototypes.

---
 lib/stack.c | 12 ++++++++++++
 lib/stack.h |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/lib/stack.c b/lib/stack.c
index d57fd96..53a9aaa 100644
--- a/lib/stack.c
+++ b/lib/stack.c
@@ -43,3 +43,15 @@ void push(struct stack *stack, struct card *card) {
     stack = new_stack;
   }
 }
+
+struct stack *pop(struct stack *stack) {
+  struct stack *popped_entry = NULL;
+
+  if(!empty(stack)) {
+    popped_entry = stack;
+    popped_entry = NULL;
+    stack = stack->next;
+  }
+
+  return(popped_entry);
+}
diff --git a/lib/stack.h b/lib/stack.h
index 72daa6f..abb35b4 100644
--- a/lib/stack.h
+++ b/lib/stack.h
@@ -6,4 +6,10 @@ struct stack {
   struct stack *next;
 };
 
+struct stack *initialize_stack();
+bool empty(struct stack *);
+int length(struct stack *);
+void push(struct stack *, struct card *);
+struct stack *pop(struct stack *);
+
 #endif