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/*
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
*/
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