135 lines
3.6 KiB
C
135 lines
3.6 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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* __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 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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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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