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  • Committer: Bazaar Package Importer
  • Author(s): RISKO Gergely
  • Date: 2002-03-29 12:24:14 UTC
  • Revision ID: james.westby@ubuntu.com-20020329122414-rh3gzqb6aslm4fgp
Tags: 1.40-1
new upstream release

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src/stack.c
 
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#include "hex.h"
 
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/******************************************************\
 
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 * Description: the just sets the stack pointer to    *
 
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 *              NULL; it really has no business being *
 
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 *              function anyways                      *
 
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\******************************************************/
 
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void createStack(hexStack *stack)
 
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{
 
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    /* calloc() is used because it NULLS out all returned memory */
 
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    /* stack = (hexStack *) calloc(1, sizeof(hexStack));
 
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    stack->llist = NULL;
 
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    stack->prev = NULL;
 
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    */
 
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    stack = NULL;
 
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    stack->llist = NULL;
 
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    stack->prev = NULL;
 
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}
 
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/******************************************************\
 
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 * Description: this pushes a structure of type       *
 
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 *              hexStack to the stack.  NULL being the*
 
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 *              initial state of the stack            *
 
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\******************************************************/
 
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void pushStack(hexStack **stack, hexStack *tmpStack)
 
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{
 
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    hexStack *oldStack;
 
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    oldStack = *stack;
 
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    if (oldStack == NULL)                               /* begining of stack  */
 
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        *stack = tmpStack;
 
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    else 
 
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    {
 
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        tmpStack->prev = oldStack;
 
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        *stack = tmpStack;
 
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    }
 
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}
 
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/******************************************************\
 
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 * Description: This function pops a structure off of *
 
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 *              the stack and then free's it's        *
 
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 *              previously allocated memory.  If the  *
 
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 *              stack == NULL that means the bottom of*
 
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 *              the stack has been reached.           *
 
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\******************************************************/
 
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void popStack(hexStack **stack)
 
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{
 
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    hexStack *tmpStack = *stack; 
 
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    if (tmpStack != NULL)
 
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    {                                           /* set to prev val in llist   */
 
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        *stack = tmpStack->prev;                /* pop off the stack          */
 
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        free(tmpStack);                         /* free allocated memory      */
 
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    }
 
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}
 
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/******************************************************\
 
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 * Description: This will pop off all values from the *
 
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 *              stack and wil free all the allocated  *
 
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 *              memory avoiding potential memory leaks*
 
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\******************************************************/
 
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void smashDaStack(hexStack **stack)
 
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{
 
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    hexStack *tmpStack = *stack; 
 
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    while (tmpStack != NULL)
 
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    {
 
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        *stack = tmpStack->prev;
 
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        free(tmpStack);
 
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        tmpStack = *stack;
 
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    }
 
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}