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stack.c
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stack.c
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/** @file stack.c Stack of void* elements.
* @ingroup data
*
* @authors Copyright © 2009-2013 Daniel Swanson <danij@dengine.net>
*
* @par License
* GPL: http://www.gnu.org/licenses/gpl.html
*
* <small>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, see:
* http://www.gnu.org/licenses</small>
*/
#include "de/libdeng1.h"
#include "de/memory.h"
#include "de/stack.h"
#include <de/c_wrapper.h>
struct ddstack_s {
size_t height; // Height of the stack.
void **data;
};
ddstack_t *Stack_New(void)
{
ddstack_t *stack = M_Malloc(sizeof(ddstack_t));
stack->height = 0;
stack->data = NULL;
return stack;
}
void Stack_Delete(ddstack_t *s)
{
if(!s) return;
// Clear the stack first.
while(Stack_Height(s) > 0)
{
Stack_Pop(s);
}
if(s->data) M_Free(s->data);
M_Free(s);
}
size_t Stack_Height(ddstack_t *s)
{
if(!s) return 0;
return s->height;
}
void Stack_Push(ddstack_t *s, void *data)
{
if(!s) return;
s->data = M_Realloc(s->data, sizeof(void *) * ++s->height);
s->data[s->height-1] = data;
}
void *Stack_Pop(ddstack_t *s)
{
void *retVal;
if(!s) return NULL;
DENG_ASSERT(s->height > 0);
if(!s->height)
{
App_Log(DE2_LOG_DEBUG, "Stack::Pop: Underflow.\n");
return NULL;
}
retVal = s->data[--s->height];
s->data[s->height] = NULL;
return retVal;
}