163 lines
4.4 KiB
C
163 lines
4.4 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 Z£niga <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 "hbapi.h"
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HB_FUNC( MEMOLINE )
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{
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char * pszString = ISCHAR( 1 ) ? hb_parc( 1 ) : "";
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ULONG ulLineLength = ISNUM( 2 ) ? hb_parni( 2 ) : 79;
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ULONG ulLineNumber = ISNUM( 3 ) ? hb_parni( 3 ) : 1;
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ULONG ulTabLength = ISNUM( 4 ) ? hb_parni( 4 ) : 4;
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ULONG ulLastSpace = 0;
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ULONG ulCurLength = 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( ulLineLength < 4 || ulLineLength > 254 )
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ulLineLength = 79;
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if( ulTabLength > ulLineLength )
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ulTabLength = ulLineLength - 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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ulCurLength = ( ( ULONG ) ( ulCurLength / ulTabLength ) * ulTabLength ) + ulTabLength;
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break;
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case HB_CHAR_LF:
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ulCurLength = 0;
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ulLastSpace = 0;
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ulLineEnd = ( ulPos >= OS_EOL_LEN ) ? ( ulPos - OS_EOL_LEN ) : ulLineBegin;
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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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ulCurLength++;
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ulLastSpace = ulCurLength;
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break;
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default:
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ulCurLength++;
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}
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if( ulCurLength > ulLineLength )
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{
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if( bWordWrap )
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{
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if( ulLastSpace == 0 || ulLastSpace == ulCurLength )
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{
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ulCurLength = 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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ulCurLength = ulCurLength - ulLastSpace;
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ulLineEnd = ulPos - ulCurLength ;
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}
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}
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else
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{
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ulCurLength = 1;
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ulLineEnd = ulPos - 1;
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}
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ulLines++;
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ulLastSpace = 0;
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if( ulLines < ulLineNumber )
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{
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ulLineBegin = ulPos - ulCurLength + 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 == 0 ) ? 0 : ( ulPos - 1 );
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}
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if( ulPos < ulLen || (ulLineNumber == ulLines && ulLineEnd >= ulLineBegin) )
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{
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ULONG ulSpAdded = 0;
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char * pszLine = ( char * ) hb_xgrab( ulLineLength );
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memset( pszLine, ' ', ulLineLength );
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if ( ulLineEnd >= ulLineBegin && ulLen > 0 )
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{
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for( ulPos = 0; ulPos <= ( ulLineEnd - ulLineBegin ); ulPos++ )
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{
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if( pszString[ ulLineBegin + ulPos ] == HB_CHAR_HT )
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ulSpAdded += ( ( ULONG ) ( ulPos / ulTabLength ) * ulTabLength ) + ulTabLength - ulPos - 1;
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else
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* ( pszLine + ulPos + ulSpAdded ) = * ( pszString + ulLineBegin + ulPos );
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}
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}
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hb_retclen( pszLine, ulLineLength );
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hb_xfree( pszLine );
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}
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else
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hb_retc( "" );
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}
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