152 lines
4.0 KiB
C
152 lines
4.0 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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* MEMOLINE() function
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*
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* Copyright 1999 Ignacio Ortiz de Zúniga <ignacio@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 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 "extend.h"
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HARBOUR HB_MEMOLINE( void )
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{
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char * pszString = hb_parc( 1 );
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USHORT uiLineLength = ISNUM( 2 ) ? hb_parni( 2 ) : 79;
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ULONG ulLineNumber = ISNUM( 3 ) ? hb_parni( 3 ) : 1;
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USHORT uiTabLength = ISNUM( 4 ) ? hb_parni( 4 ) : 4;
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ULONG uiLastSpace = 0;
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ULONG uiCurLength = 0;
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BOOL bWordWrap = ISLOG( 5 ) ? hb_parl( 5 ) : TRUE;
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ULONG ulLen = hb_parclen( 1 );
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ULONG ulLines = 0;
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ULONG ulPos = 0;
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ULONG ulLineBegin;
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ULONG ulLineEnd;
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if( uiLineLength < 4 || uiLineLength > 254 )
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uiLineLength = 79;
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if( uiTabLength > uiLineLength )
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uiTabLength = uiLineLength - 1;
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ulLineBegin = ulPos;
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ulLineEnd = 0;
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while( ulPos < ulLen && ulLines < ulLineNumber )
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{
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switch( pszString[ ulPos ] )
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{
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case HB_CHAR_HT:
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uiCurLength += uiTabLength;
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break;
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case HB_CHAR_LF:
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uiCurLength = 0;
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uiLastSpace = 0;
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ulLineEnd = ulPos - 2;
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ulLines++;
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if( ulLines < ulLineNumber )
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{
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ulLineBegin = ulPos + 1;
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ulLineEnd = 0;
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}
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break;
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case HB_CHAR_CR:
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break;
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case ' ':
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uiCurLength++;
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uiLastSpace = uiCurLength;
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break;
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default:
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uiCurLength++;
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}
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if( uiCurLength > uiLineLength )
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{
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if( bWordWrap )
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{
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if( uiLastSpace == 0 )
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{
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uiCurLength = 1;
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ulLineEnd = ulPos - 1;
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}
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else
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{
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uiCurLength = uiCurLength - uiLastSpace;
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ulLineEnd = ulPos - uiCurLength ;
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}
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}
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else
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{
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uiCurLength = 1;
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ulLineEnd = ulPos - 1;
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}
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ulLines++;
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uiLastSpace = 0;
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if( ulLines < ulLineNumber )
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{
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ulLineBegin = ulPos - uiCurLength + 1;
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ulLineEnd = 0;
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}
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}
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ulPos++;
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}
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if( ulLineEnd == 0 )
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{
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ulLines++;
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ulLineEnd = ulPos - 1;
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}
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if( ulLineNumber == ulLines )
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{
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if( (ulLineEnd - ulLineBegin + 1 ) == uiLineLength )
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{
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hb_retclen( pszString + ulLineBegin, ( ulLineEnd - ulLineBegin + 1 ) );
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}
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else
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{
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char * pszLine = hb_xgrab( uiLineLength );
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memset( pszLine, ' ', uiLineLength );
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memcpy( pszLine, ( pszString + ulLineBegin ), ( ulLineEnd - ulLineBegin + 1 ) );
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hb_retclen( pszLine, uiLineLength );
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hb_xfree( pszLine );
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}
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}
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else
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hb_retc( "" );
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}
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