102 lines
2.6 KiB
C
102 lines
2.6 KiB
C
/*
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* $Id$
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*/
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/*
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* Harbour Project source code:
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* Stack structure
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*
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* Copyright 2000 Jose Lalin <dezac@corevia.com>
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* www - http://www.harbour-project.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version, with one exception:
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*
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* The exception is that if you link the Harbour Runtime Library (HRL)
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* and/or the Harbour Virtual Machine (HVM) with other files to produce
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* an executable, this does not by itself cause the resulting executable
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* to be covered by the GNU General Public License. Your use of that
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* executable is in no way restricted on account of linking the HRL
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* and/or HVM code into it.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA (or visit
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* their web site at http://www.gnu.org/).
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*
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*/
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#include "hbapi.h"
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#include "hbapiitm.h"
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/* StackNew() --> <aStack>
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*/
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HB_FUNC( STACKNEW )
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{
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PHB_ITEM pReturn = hb_itemArrayNew( 0 ); /* Create array */
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hb_itemReturn( pReturn );
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hb_itemRelease( pReturn );
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}
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/* StackPush( <aStack>, <xValue> ) --> <aStack>
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*/
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HB_FUNC( STACKPUSH )
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{
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PHB_ITEM pArray = hb_param( 1, HB_IT_ARRAY );
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PHB_ITEM pAny = hb_param( 2, HB_IT_ANY );
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hb_arrayAdd( pArray, pAny );
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}
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/* StackPop( <aStack> ) --> <xValue>
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Returns NIL if the stack is empty
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*/
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HB_FUNC( STACKPOP )
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{
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PHB_ITEM pArray = hb_param( 1, HB_IT_ARRAY );
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long ulLen = hb_arrayLen( pArray );
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PHB_ITEM pLast = hb_itemNew( NULL );
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if( ulLen )
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{
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hb_arrayLast( pArray, pLast );
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hb_arrayDel( pArray, ulLen );
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--ulLen;
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hb_arraySize( pArray, HB_MAX( ulLen, 0 ) );
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}
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hb_itemReturn( pLast );
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hb_itemRelease( pLast );
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}
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/* StackIsEmpty( <aStack> ) --> <lEmpty>
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*/
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HB_FUNC( STACKISEMPTY )
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{
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PHB_ITEM pArray = hb_param( 1, HB_IT_ARRAY );
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hb_retl( hb_arrayLen( pArray ) == 0 );
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}
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/* StackTop( <aStack> ) --> <xValue>
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Returns the top item
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*/
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HB_FUNC( STACKTOP )
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{
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PHB_ITEM pArray = hb_param( 1, HB_IT_ARRAY );
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PHB_ITEM pLast = hb_itemNew( NULL );
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hb_arrayLast( pArray, pLast );
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hb_itemReturn( pLast );
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hb_itemRelease( pLast );
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}
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