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/*! \file stack.cpp
\brief A small general-purpose stack (not type safe)
*/
/*
This file is part of Advanced Strategic Command; http://www.asc-hq.de
Copyright (C) 1994-2010 Martin Bickel and Marc Schellenberger
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; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place, Suite 330,
Boston, MA 02111-1307 USA
*/
#include <cstring>
#include "global.h"
#include "stack.h"
#define stacksize 10000
Uint8* stackpointer = NULL;
int stackofs = 0;
const int magic = 0x12345678;
void push_data(Uint8 * daten,
int size)
{
memcpy(stackpointer+stackofs, daten, size);
stackofs+=size;
}
void pop_data(Uint8 * daten,
int size)
{
if (stackofs < size)
throw fatalstackerror();
stackofs-=size;
memcpy(daten, stackpointer + stackofs, size);
}
void pushdata(Uint8 * daten, int size)
{
if ( !stackpointer ) {
stackpointer = new Uint8 [ stacksize ];
stackofs = 0;
}
push_data ( daten, size );
push_data ( (Uint8*) &magic, sizeof ( magic ));
}
void popdata(Uint8 * daten, int size)
{
int m;
pop_data ( (Uint8*) &m, sizeof ( m ));
if ( m != magic )
throw fatalstackerror();
pop_data ( daten, size );
}
int stackfree(void)
{
return ( stacksize - stackofs);
}
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