1 files changed, 143 insertions, 0 deletions
diff --git a/src/stack.c b/src/stack.c
new file mode 100644
index 0000000..a59c2d5
--- /dev/null
+++ b/src/stack.c
@@ -0,0 +1,143 @@
+/*
+
+    casm - Simple, portable assembler
+
+    Copyright (C) 2003-2015  Ian Cowburn (ianc@noddybox.demon.co.uk)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+    -------------------------------------------------------------------------
+
+    Collection for macros.
+
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "global.h"
+#include "stack.h"
+
+
+/* ---------------------------------------- TYPES
+*/
+
+typedef struct stackitem
+{
+    void                *data;
+    struct stackitem    *next;
+} StackItem;
+
+
+struct stack
+{
+    StackItem   *items;
+    int         size;
+};
+
+
+/* ---------------------------------------- INTERFACES
+*/
+
+Stack *StackCreate(void)
+{
+    Stack *s;
+
+    s = Malloc(sizeof *s);
+
+    s->items = NULL;
+    s->size = 0;
+
+    return s;
+}
+
+
+void StackPush(Stack *stack, void *item)
+{
+    if (stack)
+    {
+        StackItem *i;
+
+        i = Malloc(sizeof *i);
+
+        i->next = stack->items;
+        i->data = item;
+        stack->items = i;
+        stack->size++;
+    }
+}
+
+
+void *StackPop(Stack *stack)
+{
+    void *item = NULL;
+
+    if (stack && stack->items)
+    {
+        StackItem *next = stack->items->next;
+
+        item = stack->items->data;
+
+        free(stack->items);
+        stack->items = next;
+        stack->size--;
+    }
+
+    return item;
+}
+
+
+void *StackPeek(Stack *stack)
+{
+    void *item = NULL;
+
+    if (stack && stack->items)
+    {
+        item = stack->items->data;
+    }
+
+    return item;
+}
+
+
+int StackSize(Stack *stack)
+{
+    return stack ? stack->size : 0;
+}
+
+
+void StackFree(Stack *stack)
+{
+    if (stack)
+    {
+        StackItem *i = stack->items;
+
+        while(i)
+        {
+            StackItem *t = i;
+
+            i = i->next;
+
+            free(t);
+        }
+
+        free(stack);
+    }
+}
+
+
+
+/*
+vim: ai sw=4 ts=8 expandtab
+*/