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stack.c

/******************************************************************************\
 *  Copyright (C) 2001, hexcurse is written by Jewfish and Armoth             *
 *                                                          *
 *  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 2 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, write to the Free Software               *
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *
 *                                                          *
\******************************************************************************/
#include "hex.h"

/******************************************************\
 * Description: the just sets the stack pointer to    *
 *          NULL; it really has no business being *
 *          function anyways              *
\******************************************************/
void createStack(hexStack *stack)
{
    /* calloc() is used because it NULLS out all returned memory */
    /* stack = (hexStack *) calloc(1, sizeof(hexStack));
    stack->llist = NULL;
    stack->prev = NULL;
    */
    stack = NULL;
    stack->llist = NULL;
    stack->prev = NULL;
}

/******************************************************\
 * Description: this pushes a structure of type       *
 *          hexStack to the stack.  NULL being the*
 *          initial state of the stack            *
\******************************************************/
void pushStack(hexStack **stack, hexStack *tmpStack)
{
    hexStack *oldStack;
    oldStack = *stack;

    if (oldStack == NULL)                       /* begining of stack  */
        *stack = tmpStack;
    else 
    {
        tmpStack->prev = oldStack;
        *stack = tmpStack;

    }
}


/******************************************************\
 * Description: This function pops a structure off of *
 *          the stack and then free's it's        *
 *          previously allocated memory.  If the  *
 *          stack == NULL that means the bottom of*
 *          the stack has been reached.           *
\******************************************************/
void popStack(hexStack **stack)
{
    hexStack *tmpStack = *stack; 

    if (tmpStack != NULL)
    {                               /* set to prev val in llist   */
      *stack = tmpStack->prev;            /* pop off the stack          */
      free(tmpStack);                     /* free allocated memory      */
    }
    
}

/******************************************************\
 * Description: This will pop off all values from the *
 *          stack and wil free all the allocated  *
 *          memory avoiding potential memory leaks*
\******************************************************/
void smashDaStack(hexStack **stack)
{
    hexStack *tmpStack = *stack; 

    while (tmpStack != NULL)
    {
        *stack = tmpStack->prev;
      free(tmpStack);
      tmpStack = *stack;
    }
}

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