152 lines
4.5 KiB
C
152 lines
4.5 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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* __STRTOKEN() helper routine for TEDITOR.PRG
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*
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* Copyright 1999 Antonio Linares <alinares@fivetech.com>
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* Matthew Hamilton <mhamilton@bunge.com.au>
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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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static char * hb_strToken( char * szText, ULONG ulText,
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ULONG ulIndex,
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char cDelimiter,
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ULONG * pulLen )
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{
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ULONG ulStart;
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ULONG ulEnd = 0;
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ULONG ulCounter = 0;
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HB_TRACE(HB_TR_DEBUG, ("hb_strToken(%s, %lu, %lu, %d, %p)", szText, ulText, ulIndex, (int) cDelimiter, pulLen));
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do
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{
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ulStart = ulEnd;
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if( cDelimiter != ' ' )
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{
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if( szText[ ulStart ] == cDelimiter )
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ulStart++;
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}
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else
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{
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while( ulStart < ulText && szText[ ulStart ] == cDelimiter )
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ulStart++;
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}
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if( ulStart < ulText && szText[ ulStart ] != cDelimiter )
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{
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ulEnd = ulStart + 1;
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while( ulEnd < ulText && szText[ ulEnd ] != cDelimiter )
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ulEnd++;
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}
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else
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ulEnd = ulStart;
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}
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while( ulCounter++ < ulIndex - 1 && ulEnd < ulText );
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if( ulCounter < ulIndex )
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{
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*pulLen = 0;
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return "";
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}
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else
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{
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*pulLen = ulEnd - ulStart;
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return szText + ulStart;
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}
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}
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/* returns the nth occurence of a substring within a token-delimited string */
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HB_FUNC( __STRTOKEN )
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{
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char * pszText;
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ULONG ulLen;
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pszText = hb_strToken( hb_parc( 1 ), hb_parclen( 1 ),
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hb_parnl( 2 ),
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ISCHAR( 3 ) ? *hb_parc( 3 ) : ' ',
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&ulLen );
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hb_retclen( pszText, ulLen );
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}
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/* like __STRTOKEN() but returns next token starting from passed position
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(0 based) inside string.
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__StrTkPtr( cString, @nTokPos, Chr( 9 ) )
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*/
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HB_FUNC( __STRTKPTR )
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{
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char * pszString = hb_parc( 1 );
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ULONG ulStrLen = hb_parclen( 1 );
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ULONG ulLen;
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ULONG ulPos = hb_parnl( 2 );
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char * pszText;
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/* move start of string past last returned token */
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pszString += ulPos;
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/* decrease length of string consequently */
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ulStrLen -= ulPos + 1;
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pszText = hb_strToken( pszString, ulStrLen,
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1,
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ISCHAR( 3 ) ? *hb_parc( 3 ) : ' ',
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&ulLen );
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/* return position to start next search from */
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hb_stornl( pszText - pszString + ulPos + ulLen, 2 );
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/* return token */
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hb_retclen( pszText, ulLen );
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}
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