From 4bb10a54cc8aac4f8b94dad91e25d9eef6779dd7 Mon Sep 17 00:00:00 2001
From: Murilo Soares Pereira <murilo.soares3@gmail.com>
Date: Sat, 3 Apr 2010 21:44:59 -0300
Subject: [PATCH] Added stack files, with push().

---
 lib/stack.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 lib/stack.h |  9 +++++++++
 2 files changed, 54 insertions(+)
 create mode 100644 lib/stack.c
 create mode 100644 lib/stack.h

diff --git a/lib/stack.c b/lib/stack.c
new file mode 100644
index 0000000..d57fd96
--- /dev/null
+++ b/lib/stack.c
@@ -0,0 +1,45 @@
+#include <malloc.h>
+#include <stdbool.h>
+#include "card.h"
+#include "stack.h"
+
+struct stack *initialize_stack() {
+  struct stack *stack = NULL;
+
+  stack = malloc(sizeof(stack));
+
+  stack->card  = NULL;
+  stack->next = NULL;
+
+  return(stack);
+}
+
+bool empty(struct stack *stack) {
+  return(stack->card == NULL);
+}
+
+int length(struct stack *stack) {
+  int length = 0;
+
+  if (!empty(stack)) {
+    length = 1;
+    while (stack->next != NULL) {
+      length++;
+    }
+  }
+
+  return(length);
+}
+
+void push(struct stack *stack, struct card *card) {
+  struct stack *new_stack = NULL;
+
+  if (empty(stack)) {
+    stack->card = card;
+  } else {
+    new_stack = malloc(sizeof(new_stack));
+    new_stack->card = card;
+    new_stack->next = stack;
+    stack = new_stack;
+  }
+}
diff --git a/lib/stack.h b/lib/stack.h
new file mode 100644
index 0000000..72daa6f
--- /dev/null
+++ b/lib/stack.h
@@ -0,0 +1,9 @@
+#ifndef STACK_H
+#define STACK_H
+
+struct stack {
+  struct card  *card;
+  struct stack *next;
+};
+
+#endif