stack_simple.c

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/****************************************************************************
 *
 *  Copyright (c) 2017, Michael Becker (michael.f.becker@gmail.com)
 *
 *  This file is part of the FreeRTOS Add-ons project.
 *
 *  Source Code:
 *  https://github.com/michaelbecker/freertos-addons
 *
 *  Project Page:
 *  http://michaelbecker.github.io/freertos-addons/
 *
 *  On-line Documentation:
 *  http://michaelbecker.github.io/freertos-addons/docs/html/index.html
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files
 *  (the "Software"), to deal in the Software without restriction, including
 *  without limitation the rights to use, copy, modify, merge, publish,
 *  distribute, sublicense, and/or sell copies of the Software, and to
 *  permit persons to whom the Software is furnished to do so,subject to the
 *  following conditions:
 *
 *  + The above copyright notice and this permission notice shall be included
 *    in all copies or substantial portions of the Software.
 *  + Credit is appreciated, but not required, if you find this project
 *    useful enough to include in your application, product, device, etc.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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#include <stdlib.h>
#include "stack_simple.h"


void InitStack(Stack_t *Stack)
{
    Stack->Count = 0;
    SlInitHead(&Stack->Head);
}


void PushOnStack(   Stack_t *Stack, 
                    SlNode_t *Node)
{
    if (!Stack)
        return;

    if (!Node)
        return;

    SlAddNodeToHead(&Stack->Head, Node);
    Stack->Count++;
}


SlNode_t *PopOffStack(Stack_t *Stack)
{
    SlNode_t *Node;    

    if (!Stack)
        return NULL;

    if (Stack->Count == 0) {
        return NULL;
    }
    else {
        Stack->Count--;
    }

    Node = SlRemoveNodeFromHead(&Stack->Head);
    
    return Node;
}