130a3239d2
* harbour/bin/hb-func.sh
* support for detecting startup function in C++ mode
* harbour/include/hbapi.h
* some few #defines to translate some xHarbour functions names to Harbour
* harbour/include/hbxvm.h
* harbour/source/compiler/gencc.c
* harbour/source/vm/hvm.c
* harbour/source/vm/itemapi.c
* harbour/source/common/hbdate.c
+ added optimizations for add and div by integer value
* changed code generated for double values to avoid limitation in some
C compilers like MSC and possible differ conversion inside C RTL then
the one which uses Harbour RTL
* some minor optimizations, cleanups and code formating
* harbour/source/compiler/hbfix.c
* optimize usage of HB_P_NOT PCODE - remove repeated NOT operations
or revert conditional jumps if they are just after NOT.
* harbour/source/rdd/dbf1.c
* added support for NULL value set in memo fields by ACCESS
* harbour/source/rdd/dbfcdx/dbfcdx1.c
* fixed ordKeyPos() - for records out of scope
* harbour/source/rtl/padc.c
* harbour/source/rtl/padl.c
* harbour/source/rtl/padr.c
* harbour/source/rtl/substr.c
* some minor optimizations to avoid new string item creation when
it's not necessary
* harbour/source/vm/classes.c
* harbour/source/vm/extend.c
* minor code formatting and optimizations
118 lines
3.7 KiB
C
118 lines
3.7 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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* SUBSTR() function
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*
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* Copyright 1999 Antonio Linares <alinares@fivetech.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, or (at your option)
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* any later version.
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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 software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA (or visit the web site http://www.gnu.org/).
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*
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* As a special exception, the Harbour Project gives permission for
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* additional uses of the text contained in its release of Harbour.
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*
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* The exception is that, if you link the Harbour libraries with other
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* files to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the Harbour library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the Harbour
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* Project under the name Harbour. If you copy code from other
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* Harbour Project or Free Software Foundation releases into a copy of
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* Harbour, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for Harbour, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice.
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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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#include "hbapierr.h"
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/* returns l characters from n characters into string */
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HB_FUNC( SUBSTR )
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{
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PHB_ITEM pText = hb_param( 1, HB_IT_STRING );
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if( pText && ISNUM( 2 ) )
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{
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long lPos = hb_parnl( 2 );
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long lSize = ( long ) hb_itemGetCLen( pText );
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if( lPos < 0 )
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{
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lPos += lSize;
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if( lPos < 0 )
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lPos = 0;
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}
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else if( lPos )
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{
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lPos--;
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}
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if( lPos < lSize )
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{
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long lLen;
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if( hb_pcount() >= 3 )
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{
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if( ISNUM( 3 ) )
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{
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lLen = hb_parnl( 3 );
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if( lLen > lSize - lPos )
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lLen = lSize - lPos;
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}
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else
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{
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hb_errRT_BASE_SubstR( EG_ARG, 1110, NULL, "SUBSTR", HB_MIN( hb_pcount(), 3 ), hb_paramError( 1 ), hb_paramError( 2 ), hb_paramError( 3 ) );
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/* NOTE: Exit from inside [vszakats] */
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return;
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}
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}
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else
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lLen = lSize - lPos;
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if( lLen > 0 )
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{
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if( lPos == 0 && lLen == lSize )
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hb_itemReturn( pText );
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else
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hb_retclen( hb_itemGetCPtr( pText ) + lPos, lLen );
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}
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else
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hb_retc( NULL );
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}
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else
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hb_retc( NULL );
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}
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else
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hb_errRT_BASE_SubstR( EG_ARG, 1110, NULL, "SUBSTR", HB_MIN( hb_pcount(), 3 ), hb_paramError( 1 ), hb_paramError( 2 ), hb_paramError( 3 ) );
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}
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