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stackobject.c
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stackobject.c
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#include <stackobject.h>
/*
* Function - stack_init
* Return - Pointer to NULL
* Description - Returns a pointer to NULL
*/
struct STACKOBJECT *stack_init (void)
{
struct STACKOBJECT *this = NULL;
return this;
}
/*
* Function - stack_push
* Description - Push's data onto the stack
*/
boolean stack_push (struct STACKOBJECT ** this, const void *data,
const size_t size)
{
struct STACKOBJECT *curr;
curr = (struct STACKOBJECT *) malloc (sizeof (struct STACKOBJECT));
if (curr == NULL)
{
return FALSE;
}
curr->next = *this;
*this = curr;
curr->data = (char *) malloc (size);
if (curr->data == NULL)
{
return FALSE;
}
memcpy ((void *) curr->data, (void *) data, size);
curr->size = size;
return TRUE;
}
/*
* Function - stack_pop
* Return - Pointer to data that was on the stack
* Description - Returns a pointer to data on the stack
*/
char *stack_pop (struct STACKOBJECT **this)
{
struct STACKOBJECT *curr = *this;
char *data;
if (curr != NULL)
{
data = (char *) malloc ((size_t) curr->size);
memcpy (data, curr->data, (size_t) curr->size);
curr = (*this)->next;
free (*this);
*this = curr;
}
else
{
data = NULL;
}
return data;
}
/*
* Function - stack_isEmpty
* Return - TRUE or FALSE
* Description - Says if the function is empty or not
*/
boolean stack_isEmpty (const struct STACKOBJECT ** this)
{
boolean retval;
if (*this == NULL)
{
retval = TRUE;
}
else
{
retval = FALSE;
}
return retval;
}
/*
* Function - stack_destroy
* Description - Destroys a stack, sets the in stack to NULL when done
*/
void stack_destroy (struct STACKOBJECT **this)
{
while (!stack_isEmpty (this))
{
stack_pop (this);
}
free (*this);
*this = NULL;
}